Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 13010 (2002): ac Watthour Meters, Class 0.5, 1 and 2[ETD 13: Equipment for Electrical Energy Measurement andLoad Control]

Is 13010:2002

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ac WATTHOUR

Indian Standard

METERS, CLASSSPECIFICATION

0.5, 1 AND 2 —

(First Revision )

ICS 17.220.20

0 BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

SeDtember 2002 Price Group 9

Equipment for Electrical Energy Measurement and Load Control Sectional Committee, ET 13

FOREWORD

This Indian Standard ( First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized bythe Equipment for Electrical Energy Measurement and Load Control Sectional Committee had been approved bythe Electrotechnical Division Council.

This standard was first published in 1990. This revision has been brought out to update some of the requirements.

The test levels as specified in this standard are regarded as minimum values to guarantee the proper fimctioningof the meter under normal working conditions. For special applications other test levels might be necessary andhave to be fixed between the user and the manufacturer.

An explanatory note in relation to watthour meters of Class 0.5 is given in Annex A.

The following publications have also been referred to in this standard:

a) IEC 60068-2-75 ( 1997 ) Environmental testing — Part 2-75: Tests — Test Eh: Hammer tests.

b) 1S0 75-1:1993 Determination of temperature of deflection under load — Part 1: General test method.

c) ISO 75-2:1993 Determination of temperature of deflection under load — Part 2: Plastics and ebonite.

d) IEC 61000-4-5 ( 1995 ) Electromagnetic compatibility ( EMC ) — Part 4: Testing and measurementtechniques — Section 5 Surge immunity test.

e) IEC 60387 ( 1992-08 ) Symbols for alternating-current electricity meters.

While preparing this standard, assistance has been derived ffom IEC 60521 ( 1988) ‘Class 0.5, 1 and 2 alternatingcurrent watthour meters’, issued by the International Electrotechnical Commission’.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2:1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

, ,,

Is 13010:2002 h

Indian Standard

ac WATTHOUR METERS, CLASSSPECIFICATION

(First Revision )

1 SCOPE

1.1 This standard applies only to induction typewatthour meters of accuracy Class 0.5,1 and 2, for themeasurement of alternating current electrical activeenergy.

1.2 It applies to the assembly of meters and accessories,including current transformers, when enclosed in themeter case. It does not apply to maximum demandindicators which is covered by IS 8530.

1.3 It does not apply to any kind of measuringdevices such as those used for telemetering electricalenergy covered by IS 14451 ( Part 1 ).

1.4 This standard applies to multi-rate meters, butdoes not apply to other special types of meters ( forexample, excess consumption meters ), or to metersused for testing purposes covered by IS 11426.

1.5 It does not apply to watthour meters where thevoltage across the connection terminals exceeds600 V ( line to line voltage for meters for polyphasesystems ).

NOTE — For portable meters and meters for outdooruse, additionalrequirementsmaybe necessary.

2 &ERENCES

2.1 The Indian Standards listed in Annex B arenecessary adjuncts to this standard.

3 TERMINOLOGY

3.0 For the purpose of this standard, the followingdefinitions shall apply.

3.1 Watthour Meter ( Active Energy Meter)

An instrument which measures active energy byintegrating active power with respect to time andregisters in watthour or in suitable multiples thereof.

3.2 Induction Meter

A meter in which fluxes produced by currents in fixedcoils react with the eddy currents induced in aconducting moving element, generally as disc(s), whichcauses the movement of the moving element.

~ 3 Multi-Rate Meter

h energy meter provided with a number of registers,each becoming operative at specified time interval

1

0.5, 1 AND 2 —

corresponding to different tariffs.

3.4 Meter Rotor

The moving element of the meter upon which themagnetic fluxes of fixed windings and of brakingelements act, and which operates the register.

3.5 Meter Driving Element

A working part of the meter which produces a torqueby the action of its magnetic fluxes upon the currentsinduced in the moving element. It compriseselectromagnets with their control devices and adjustingdevices.

3.6 Reverse Running Stop

A mechanism to prevent reverse registration.

3.7 Meter Braking Element

The part of the meter which produces a braking torqueby the action of its magnetic flux upon the currentsinduced in the moving element. It comprises one ormore permanent magnets and their adjusting devices.

3.8 Register of Meter ( Counting Mechanism)

Thepart of the meter which enables the measured value,that is, energy, to be registered.

3.9 Meter Base

The back of the meter by which it is generally fixedand to which are attached the frame, the terminals orthe terminal block and the cover.

For a flush-mounted meter, it may include the sidesof the case.

3.9.1 Meter Socket

An enclosure with jaws to accommodate terminals ofa ‘detachable meter and which has connectors fromthe termination of the circuit conductors, It maybe asingleposition socket for one meter or a multi-positionsocket for two more meters.

3.10 Meter Cover

The enclosure on tlont of the meter made either whollyof transparent material or of opaque material providedwith window(s) through which the movement of therotor can be seen and the register can be read.

Is 13010:2002

3.11 Meter Case

id

This comprises the base and the cover.

3.11.1 Insulating encased meter of protective Class1: Meter in which protection against electric shockdoes not rely on basic insulation only, but whichincludes an additional safety precaution such thatconductive accessible parts are connected to theprotective earthing conductor in the fixed wiring ofthe installation in such a way that conductiveaccessible parts cannot become live in the event of afailure of the basic insulation.

NOTE — This provision includes a protective earthterminal.

3.11.2 Insulating encased meter of protectiveClass 2: Meter with a case of insulating material inwhich protection against electric shock does not relyon basic insulation only, but in which additional safetyprecautions, such as double insulation or reinforcedinsulation, are provided, there being no provision forprotective earthing or reliance upon installationconditions.

3.12 Meter Frame

The part to which are affixed the driving elements,the rotor bearing, the register, usually the brakingelement and sometimes the adjusting devices.

current of the external circuit, to which the meter isconnected.

NOTE — When the meter incorporates a currenttransformer, the current circuit also includes thetransformer windings.

3.18 Voltage Circuit

The windings of the driving element and internalconnections of the meter, supplied with the voltageof the circuit to which the meter is connected.

3.19 Auxiliary Circuit

The element ( windings, lamps, contacts, etc. ) andconnections of an auxiliary device within the metercase intended to be connected to an external device,for example, clock, relay and impulse counter.

3.20 Basic Current 1)(lb)

The value of current in accordance with which therelevant performance of the meter is fixed.

3.21 Rated Maximum Current 1)(Imax )

The highest value of current at which the meter purportsto meet the accuracy requirements of this standard.

3.22 Reference Voltagel)

The value of voltage in accordance with which therelevant performance of the meter is fixed.

3.13 Accessible Conducting Part 3.23 Reference Frequency

A conducting part which can be touched by the standard The value of frequency in accordance with which thetest finger when the meter is installed ready for use. relevant performance of the meter is fixed.

NOTE — To determine whether a part is accessible, 3.24 Basic Speedeither visual inspection shall be used; or the flexible testfinger given in the Fig. 1 of IS 1401, or the rigid test The nominal speed of rotation of the rotor expressedfinger given in Fig. 2 of IS 1401shall be applied. In in revolutions per minute when the meter is undercase of doubt, the latter shall be applied witha maximumforce of 30 N.

reference conditions and carries basic current atCosm=l.

3.14 Protective Earth Terminal 3.25 Basic Torque

The terminal connected to accessible conducting parts The nominal value of torque on the rotor at rest whenof a meter for connection to the earth, for the sake of the meter is under reference conditions and when basicsafety. current is applied at cos @ = 1.

3.15 Terminal Block

A support made of insulating material on which all orsome of the terminals of the meter are grouped together.

3.16 Terminal Cover

A cover which encloses the meter terminals and, ifrequired, the ends of the external wires or cablesconnected to the terminals.

3.17 Current Circuit

The winding of the driving element and the internalconnections of the meter through which flows the

3.26 Meter Constant

Constant expressing the relation between energyregistered by the meter and corresponding numberof revolutions of the rotor, expressed in revolutionsper kilo watthour ( rev/kWh ).

3.27 Reference Temperature

The ambient temperature specified for referenceconditions.

I)The terms voltage and current indicates lTllSVdUeS, Unks

specified.

,..9

2

&—

3.28 Clearance

The shortest distance measured in air betweenconductive parts.

3.29 Creepage Distance

The shortest distance measured over surface ofinsulation between the conductive parts.

3.30 Percentage Error

The percentage error is given by the followingformula:

R–APercentage error = — x 100

A

where

R = energy registered by the meter, and

A = true energy.

NOTE— Since the true value cannot be determined, itis approximated by a value with a stated uncertaintythat can be traced to standards agreed upon betweenmanufacturer and user or to national standards videIS 12346.

When determined from the rotor speed,

Percentage errorT– t=— Xloo”

where

T=

f =

t

true time, that is, the time a correct meterwould require for the same number ofrevolutions of the rotor; and

observed time for a given number ofrevolutions of the rotor.

The terms voltage and current indicates rms values,unless specified.

3.31 Variation of Error Due to an InfluenceQuantity

The difference between percentage errors of meterwhen only one influence quantity assumes successivelytwo specified values, one of them being the referencevalue,

3.32 Influence Quantity or Factor

Any quantity or any factor, generally external to meter,which may affect the measured value.

3.33 Distortion Factor

The ratio of rrns value of the harmonic content ( obtainedby subtracting from a non-sinusoidal alternatingquantity, its fi.mdamental component) to the rms valueof the non-sinusoidal quantity. The distortion factoris usually expressed as a percentage.

Is 13010:2002

3.34 Mean Temperature Coefficient

The ratio of variation of percentage error to the changeof temperature which produces this variation.

3.3S Vertical Working Position

The position of the meter in which the shaft of therotor is vertical.

3.36 Class Index

A number which gives the limits ..of permissiblepercentage error, for all values of current, between10 percent of lb and lmax, for cos @= 1 ( and in caseof polyphase meters with balanced load ) when themeter is tested under reference conditions ( includingpermitted tolerances on the reference values) as definedin this standard.

3.37 Classification Angle ( Degree of PhaseDisplacement )

The nominal phase displacement between voltage andcurrent magnetic fluxes of a single driving element( see Note ) in principal air gaps when the voltageand current applied to this single element are in phase.

NOTE — Driving element includes any necessaryaccessories,resistors, inductorsand shunts.

3.38 ~pe

Designation used for defining a particular design ofmeter manufactured by one manufacturer, having:

a)

b)

c)

d)

e)

similar metrological properties,

the same uniform construction of partsdetermining these properties,

the same number of ampere-turns for thecurrent winding at basic current and the samenumber’ of turns per volt, for the voltagewinding at reference voltage,

the same ratio of the rated maximum currentto the basic current, and

the same value of basic torque with a tolerance ,of * 10 percent.

They may have several values of basic current andseveral values of reference voltage. These metes aredesignated by the manufacturer by one or more groupsof letters or number, or of a combination of letters andnumbers. Each type has one designation only.

NOTES

1 The type is represented by the sample meter(s) intendedfor type tests and whose characteristics ( basic currentsand reference voltage ) are chosen from the values givenin Tables 1 and 2, proposed by the manufacturer.

2 Where the number of ampere-turns would lead tonumber of turns other than a whole number, the product

+I

,...--,

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Is 13010:2002

of the number ot’turns of the windings bythe value ofthe basic current may differ from that of the samplemeter(s) representative of the type. It is advisable tochoose the next number immediately above or below inorder to have whole number of turns. Only for thisreason maybe number ofturns pervolt of the voltagewindings differ, but bynotmore than 20 percent fromthat of the sample meters representative of the type.

3 Theratio of thehighest tothelowest basic speed ofthe rotors to each of the meters of the same type shallnot exceed 1:1.5.

3.39 Type Tests

Tests carried out under prescribed conditions toverify one of the characteristics of the type of themeter.

3.39.1 Type Approval Procedure

The procedure according to which the series of typetests is carried out on one meter or on small numberof meters of the same type having identicalcharacteristics, selected by the manufacturer, to veri~that the respective type of meter complies with all therequirements of the standard for the relevant classof meters.

3.39.2 Qualljication Procedure

The procedure according to which type tests are carriedout on one meter or on a small number of meters ofthe same type having identical characteristics, selectedat random, to verify that the meter type has no serioussystematic abnormalities . The precise tests and thenumber of meters to be tested are to be agreed betweenthe parties.

NOTE- In practice, it is consideredthat no serioussystematicabnormalitiesexist when two out of threemeters tested comply with the relevant requirementsof this standard for the considered test.

3.40 Routine Tests

Tests carried out on each meter to check conformitywith the requirements of this standard in aspects whichare likely to vary during production

3.41 Acceptance Tests

Tests carried out on all meters or on samples drawnffom a batch for the purpose of acceptance of the batchduring inspection by the purchaser.

3.42 Optional Tests

Special test to be carried out, when required, by

agreement between the purchaser and the supplier.

3.43 Efficiency Factor

Mathematically defined as :

Permanence factor

Voltage circuit power loss

where

Permanence factor =Driving torque x 100

Rotor weight x Rotor speed

Driving torque is in g-cm;

Rotor weight is in g;

Rotor speed is in rpm; and

Voltage circuit power loss is in watts.

NOTE — Torque and speed correspond to the respectiveL!

‘value when the meter is under reference conditions,carrying the basic current at unity power factor. Powerloss in 2 voltage circuits is the average of the powerloss of 2 voltage circuits for 3-wire meters and average

dof power loss of 3-volt ge circuits for 3-phase 4-wiresystems.

4 CLASSIFICATION

4.1 Meters are classified according to their respectiveclass indices, for example, 0.5, 1 or 2.

5 RATINGS

5.1 Standard Basic Currents

The basic currents shall be as given in Table 1.

Table 1 Standard Basic Currents

( Clauses 3.38 wnd5.1 )

Type of Meter Basic Current ( Amps )

(1) (2)

1-phase 2.5, 5, 10, 15, 20

3-phase 5, 10, 15,20, 30,40, 30

For connection through lor5current transformer(s)

5.2 Rated Maximum Currents

Maximum rated current for whole current meters shallbe preferably an integral multiple of the basic current( that is four times the basic current ). The ratedmaximum current of meter shall have the same valueas the rated extended secondary current of the currenttransformer.

5.3 Standard Reference Voltages

The reference voltage shall be as given in Table 2(see IS 12360).

Table 2 Standard Reference Voltages

( Clauses 3.38 and5.3 )

Meters for Standard Reference ExceptionalVoltage(V) Values(V)

(1) (2) (3)

Direct connections 230( 400 ), 220( 380 ),and through current 240( 415 ) 250( 433 )transformer onlyconnection through 57.7( 100 ), 100( 173 )voltage transformer 63.5( 110 ), 200

,.

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Is 13010:2002

5.4 Standard Frequency 6.2.3 The holding on and sealing screws shall be held

Standard value for reference frequency is 50 Hz.captive in the meter cover when fixed from front.

6.2.4 The case shall be so constructed and arranged6 GENERAL AND CONSTRUCTIONALREQUIRENiENTS

that any non-permanent deformation cannot preventthe satisfactory operation of the meter.

6.1 General

Meters shall be designed and constructed in such away as to avoid introducing danger in normal use andnormal conditions.

— personal safety against electric shock,

— personal safety against effects of excessivetemperature,

— safety against spread of tire.

6.1.1 All parts which are subject to corrosion undernormal working conditions shall be effectivelyprotected against corrosion due to atmospheric causes.Any protective coating shall not be liable to damageby ordinary handling nor injuriously affected byexposure to air, under normal working conditions.

NOTE — For meters for special use in corrosiveatmosphere, additional requirements shall be fixed inthe purchased contract.

6.1.2 The meter shall have adequate mechanicalstrength and shall withstand the fluctuations oftemperature, which are likelyto occur in normal workingconditions,

6.1.3 The components shall be reliably fastened andsecured against loosening.

6.1.4 The electrical connections shall be such as toprevent any opening of the circuit under normalconditions of use, including any overload conditionsspecified in this standard.

6.1.5 The construction of the meter shall be such asto minimize the risks of short-circuiting of the insulationbetween live parts and accessible conducting partsdue to accidental loosening or unscrewing of the wiring,screws, etc.

6.1.6 The meter shall not produce appreciable noisein use.

6.2 Case

6.2.1 The meter shall have a reasonably dust/moisture-proof case, which may be sealed in such a way thatthe internal parts of the meter are accessible only afterbreaking the seals.

6.2.5 The case of a Class 0.5 meter shall be constructedso that, if mounted according to the manufacturer’sinstructions, the meter shall not deviate by morethan 0.5° in all directions from its vertical position( see Note 2 in Table 8 ).

6.2.6 The meters, having a case wholly or partiallymade of metal, shall be provided with a protectiveearth terminal.

6.3 Windows

If the meter cover is not transparent, one or morewindows shall be provided for reading the registerand observation of the rotor. These windows shallbe covered by plates of transparent material whichcannot be removed without breaking the seals.

The glass or any other transparent cover of the windowshall be replaceable from inside only. The windowcover shall be dust/moisture proof and shall not beremovable from outside without damage.

6.4 Terminals — Terminal Block(s) and ProtectiveEarth Terminal

Terminals may be grouped in one or more terminalblock(s) having adequate insulating properties andmechanical strength. In order to satisfy suchrequirements, when choosing insulating materials forthe terminal block(s), adequate testing of materialsshould be taken into account. The material of whichthe terminal block is made shall be capable of passingthe tests given in 1S0 standard 75 for temperature of135 ‘c.

The holes in the insulating material which form aprolongation of the terminal holes shall be of sufficientsize to accommodate the insulation of the conductorsalso,

NOTE — Whether the disconnecting device for the metervoltage circuit will be in the terminal compartment orinside the meter cover, shall be a matter of agreementbetween the ma&rfacturer and the purchaser. However,if the test faciIity permits, it may also be agreed by theparties to dispense with such disconnecting device, sothat voltage terminal(s) may be connected firmly tothe input current terminal (s) and cannot be disconnectedeasily.

6.4.1 Fixing of Conductors

6.2.2 The cover shall not be removable without the The manner of fixing the conductors to the terminalsuse of tool, coin or any similar device. shall ensure adequate and durable contact to eliminate

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Is 13010:2002

risk of loosening or undue heating, All parts of everyterminal shall be such that the risk of corrosion resultingfrom contact with any other metal part is minimized.

Screw connections transmitting contact force andscrew fixings which may be loosened and tightenedseveral times during the life of the meter shall be ametal nut.

Electrical connections shall be so designed that contactpressure is not transmitted through insulating material.

6.4.1.1 Two screws shall be provided in each currentterminal for effectively clamping the external leads orthimbles. Alternatively, if an elastic pressure plateor similar effective device is provided to keep the entirelength of the conductor within the terminal well pressed,one screw may be used. Each clamping screw shallengage a minimum ‘of three threads in the terminal.The ends of screws shall be such as not to pierce andcut the conductors used.

6.4.1.2 Meters with rated maximum current 100 A andabove shall be connected through soldering/crimpedsockets. Meters with rated maximum current of60 and above maybe connected through soldering/crimped sockets.

6.4.1.3 Connections of current ~kuit conductorsojmeter current terminals

The current circuit conductors of a meter shall be

connected to its current terminals inside the meterterminal block adopting any of the recommended

methods given in Annex C so as to ensure satisfactorydurable and adequate contact surfaces between theconductors and the terminals.

6.4.2 Dimensions of Terminal Holes

The internal diameter of terminal holespecified in Table 3,

Table 3 Terminal Holes

shall be as

Rated Current (A) Internal Dia

Max Min ( mm )

(1) (2)

Upto and including40 5.5

41 to60 8.0

61 tO 120 9.5

6.4.3 Clearances and Creepage Distance

The clearances and creepage distance of terminal blockand those between the terminals and the surroundingparts of the metal enclosure shall be not less than thevalues specified in Table 4 for voltages existing whenoperating under reference conditions.

Table 4 Clearance and Creepage Distances

( Clauses 6,4,3 and6.4.3.6 )

Voltage ( V ) Clearance Creepage(mm) Distance ( mm )

(1) (2) (3)

Up to & including 25 1 1

26 to 60 2 2

61 to 250 3 3

251 to 450 3 4

45 I to 600 4 6

6.4.3.1 For current circuits, the voltage shall beconsidered to be’the same as for the related voltagecircuit.

6.4.3.2 Clearance of minimum 3 mm shall be providedbetween incoming and outgoing terminals of the samephase.

6.4.3.3 A clearance of minimum 2 mm shall be providedbetween pressure terminal and current terminals ofthe same phase.

6.4.3.4 Terminals with different potentials which aregrouped close together shall be protected againstaccidental short-circuiting. Protection may be obtainedby insulating barriers. Terminals of one current circuitare considered to be at the same potential.

6.4.3.5 The terminal, the conductor fixing screws,or the external or internal conductors shall not beliable to come into contact metal terminal coversand meter terminal base. For this purpose, terminalblock shall be rigidly fixed to the meter base.

6.4.3.6 The clearance between the terminal cover ifmade of metal, and the upper surface of the screwswhen screwed down to the maximum applicable to the -conductor fitted shall be not less then the relevantvalues specified in Table 4. If the terminal cover ismade of insulating material, the clearance shall be notless than 1 mm.

6.4.4 Protective Earth Terminal

The protective earth terminal, if any, shali:

a)

b)

c)

d)

e)

be electrically bonded to accessible metalparts;

form part of the meter base, if possible;

preferably be located adjacent to its terminalblock;

accommodate a conductor having a cross-section at least equivalent to the main currentconductors but with a lower limit of 6 mm2and an upper limit of 16 mm2; and

be clearly identified by the earth symbol.

6

&

Is 13010:2002

All parts of every terminal shall be such that the riskof corrosion resulting fi-omcontact with any other metalpart is minimized.

After installation, it shall not be possible to loosenthe protective earth terminal without the use of a tool,coin or any similar device.

6.5 Terminal Cover(s)

Every terminal block shall be provided with a terminalcover conforming to 6.5.1 or 6.5.2, which can besealed independently of the meter cover.

6.5.1 Short Terminal Cover

The terminals, their fixing screws and the insulatedcompartment housing them shall be enclosed by acover of more or less same size as that of the terminalblock, such that the wiring for connection may becarried out from the bottom of the meter board.

6.5.2 Extended Terminal Cover

The terminals, their fixing screws, a suitable lengthof external insulated conductor and its insulation shallbe enclosed by a cover with a provision for sealing,such that the wiring for connections can be carriedout from the rear of the meter board only.

plate, screws, suspensions and rivets. If such smallparts are accessible by the standard test finger( see IS 1401 ) from outside the case, then they shallbe additionally isolated from live parts bysupplementary insulation against failure of basicinsulation or loosening of liver parts. The insulatingproperties of lacquer, enamel, ordinary paper, cottonoxide film on metal parts, adhesive film and sealingcompound or similar unsure materials, shall not beregarded as suftlcient for supplementary insulation.

For the terminal block and the terminal cover of sucha meter, reinforced insulation is suffkient.

6.8 Resistance to Heat and Fire

The terminal block, the terminal cover and the metercase shall ensure reasonable safety against spreadof fwe. They should not be ignited by thermic overloadof live parts in contact with them. To comply therewiththey must fulfil the test as specified in 11.23.

6.9 Protection Against Penetration of Dust andWater

The meter shall conform to the degree of protectionas given below:

Indoor meter ZP51, but without suction in the

6.5.3 The fixing screws used on the terminal cover meter.

for fixing and sealing in 6.5.1 and 6.5.2 shall be held 6.10 Register ( Counting Mechanism)captive in the terminal cover.

6.5.4 The requirements of 6.5.1 and 6.5.2 shall not6.10.1 General

apply to portable meters provided with plug-in The register may be of the drum ( cyclometer ) or theconnections. pointer type.

6.5.5 When the meter is mounted on the meter board 6.10.1.1 The principal unit in which the register recordsand thereafter energised, no access to the terminals shall be the kilowatt-hour ( kWh ), or megawatt-hourshall be possible without breaking the seal(s) of the ( MWh ).terminal cover.

6.10.1.2 In cyclometer type registers, the principal6.6 Non-Flammability unit in which the register records shall be marked

The terminal block, the terminal cover (if not of metal)adjacent to the set of drums and only the last drum,that is, the drum on the extreme right shall be movable

and the case (if not of metal) shall be of a material continuously.which complies with the requirements of

6.10.1.3 In pointer type registers, the unit in whicha) method FH1 as per IS 11731 ( Part 1 ), and the register records shall be marked adjacent to theb) the tests given in 1S0 75 for a temperature units dial in the form, for example, 1kWh/div or 1mWh/

of 135°C and a pressure of 1.8 MPa div, and the decimal multiples maybe marked adjacent( Method A ). to other.

NOTE — If the materials of the terminal bock, theterminal cover and the case meet this requirement the For example, in a registering in terms of kWh, the units

tinished meter need not be te~,.. dials shall be marked, 1 kWh/div and adjacent to the

6.7 Insulating Encased Meter of Protective Class 2other dials to the left of the units dials shall bemarked 10,100,1000 etc.

....

:,:.>

A meter having a durable and substantially continuous 6.10.1.4 Decimal dials or drums shall be coloured,enclosure made wholly of insulating material, including or encircled in colour, the fastest moving beingthe terminal cover, which envelopes all metal parts graduated and numbered. The smallest division of thewith the exception of small parts, for example, name- fastest moving drum or dial shall represent not more

7

Is 13010:2002

than 30 revolutions of the rotor ( for meters providedwith decimal drums ).

Drums, when continuously rotating, or dials indicatingthe lowest values shall be graduated and numberedin ten divisions, each division being subdivided intoten parts or any oth~, arrangement ensuing the samereading accurately, Drums of cyclometer type registersor dials of pointer type registers which indicates adecimal fraction of the unit shall, when they are visiblebe encircled in different colour or be coloured,

6.10.1.5 The register shall be able to record, startingfrom zero, for a minimum of 1 500 h, the energycorresponding to the rated maximum current atreference voltage and unity power factor. Any highervalue may be agreed upon by the manufacturer andthe purchaser.

6.10.1.6 Register markings shall be indelible and easilyreadable.

6.10.1.7 Self-alignment of register

The register shall be of self-aligning type so that theregister will align itself correctly with respect to therotor when pushed into the full extent.

6.10.2 Dimensions

6.10.2.1 Pointer register

The pointers shall indicate on circular dials each dividedinto ten equal divisions. The radius of the circles shallbe not less than 7.0 mm and the radial length of thepointer shall be less than the radius of the circles,but by not more than 0.5 mm. The height of the figuresround the circles shall be not less than 2.5 mm normore than 3 mm. Theradiusof thecircleswhichindicatevalue lower than one kilo watthour per division maybe smaller than 7.0

6.10.2.2 Drum register

The diameter of the drums shall be at least 14 mm .Theheight of the numerals on the drums shall be at least4 mm and their width at least 2 mm.

6.10.3 The material of drums shall be metallic /specialsynthetic material. The later material shall withstandtemperatures of boiling water for 5 min continuouslywithout distortion or softening.

6.11 Direction of Rotation and Marking of the Rotor

The edge of the rotor nearest to an observer viewinga meter from the front shall move from left to right forpositive registration. The direction of rotation shallbe marked by a clearly visible indelible arrow.

The edge and upper surface of the disc shall carry aneasily visible mark to facilitate revolution counting,Other marks may be added for stroboscopic or other

\

,,,)>

tests, but such marks shall be so placed as not to interfere !:,

with the use of the main visible mark for photoelectric (

revolution counting. The circumference of the discshall also be graduated on the upper surface into 100

y

division, or multiples thereof.

6.12 Recommended Guideline for ConstructionalFeatures w

Meters with special constructional features as desiredby the utilities maybe supplied by mutual agreement. iiRecommended guidelines on the constructionalfeatures which should form the basis for mutualagreement is given in Annex D.

7 SPEED OF ROTATION

7.1 The speed of rotor of the single phase meters atreference voltage, unity power factor and maximumcurrent shall not exceed 72 rpm. The speed of rotorof polyphase meters at reference voltage, unity powerfactor and maximum current shall not exceed 50 rpm.

7.2 Torque/Speed Ratio

[ Under consideration to replace 7.1 andAnnex].

8 MARKING OF METERS

8.1 Marking and Nameplates

Every meter shall bear the following information withindelible and distinct markings, readable from outsidethe meter:

a)

b)

c)

d)

e)

f)

g)

h)

J~

..=

Manufacturer’s name or trade-mark and, ifrequired, the place of manufacture;

‘uDesignation of type;

The nature of current, the number of phasesand number of wires for which the meter issuitable ( for example 1-phase — 2-wire,3-phase — 3-wire, 3-phase — 4-wire );

Serial number and year of manufacture. If theserial number is marked on a plate fixed tothe cover, this number is also to be markedon the base or frame;

Principal unit in which the meter records( for example; kWh or kVArh );

The reference voltage in one of the formsgiven in Table 5;

Currents in the form given as example inTable 6;

Reference frequency in Hertz;

Meter constant, for example, in the form xrevfk Wh;

.,

8

k)

m)

n)

Class index, for example, Cl 0.5, Cl 1, Cl 2;

Reference temperature, if different from27° C; and

Transformation ratio(s), if the meter register(s)energy through instrument transformer(s) ofwhich account is taken in the meter constant.

NOTES

1 The information under (a), (b) and (c) maybe markedon an external plate permanently attached to the metercover. The information under (d) to (n) shall be markedO! nameplate preferably placed within the meter andwhich may, for example, be attached to the meter register.The information may be marked on the meter dial.

2 If the meter is of a special type ( for example, providedwith a reversal preventing device or is intendedfor acapacitiveload), thisshallbeindicatedonthenameplateor on a separate plate.

3 Standard symbols shall also be used ( see IEC 60387( 1992-08 ).

4 The sign of El shall be used for insulating encasedmeters of protective Class H.

Table 5 Voltage Marking

( Clause 8.1 )

Type of Meter No. of Element & Normal Systemthe Voltage at the Voltage orTerminals of the Secondary

Voltage Circuit(s) Voltage V.T.

(1) (2) (3)

1 phase 2 wire 230 V -ill OV

3 phase 3 wire 2x415V 3x6600/n OV2 element

3 phase 4 wire 3 x voltage 3X( 132 OOOfi)/3 elem’ent between line (llofi)v

Table 6 Current Marking

( Clause 8.1 )

Type of Meter Method of Marking Example

(1) (2) (3)

1 phase/3 phase Basic current 1O-2OAdirect connection and rated max

current

1 phase/3 phase Basic current -/5 AC.T. operated

8.1.1 BIS Certlflcation Marking

The meter may also be marked with the Standard Mark.

8.1.2 The use of the Standard Mark is governed bythe provision of Bureau ofIndian StandarA Act, 1986and the Rules and Regulations made thereunder. Thedetails of conditions under which the licence for theuse of Standard Mark maybe granted to manufacturersor producers maybe obtained from the Bureau of IndianStandards.

Is 13010:2002

8.2 Connection Diagram and Terminal Marking

8.2.1 Every meter shall be indelibly marked with aconnection diagram. For polyphase meters, thisdiagram shall also show the phase sequence for whichit is intended.

8.2.2 If the meter terminals are marked, this markingshall appear on the diagram.

8.2.3 A standard connection diagram is shown inFig. 1.

I

R

o ●o LOAD

1 a) Single-Phase Two-Wire Meter

1 b) Single-Phase Two-Wke Meter SymmetricalConnections

1 c) Three-Phase Three-Wire Double Tariff Meter forDirect Connection

M = MotorTk = Tariff SwitchTRe = Relay

1 d) Three-Phase Three-Wire Double Tariff Meterwith Current Transformers

FIG. 1 STANDARDCONNECTIONDIAGRAM — Contd.

.

9

-4

Is 13010:2002

%-6 LOAD

1 e) Three-Phase Three-Wire Double Tariff Meterwith Current and Voltage Transformers

.OAO

1 f) Three-Phase Four-Wire Single Tariff Meterfor Direct Connection

M=Tk =TRe .

MotorTariff SwitchRelay

LOAO

1 g) Three-Phase Four-Wire Single Tariff Meter withCurrent Transformers

LOAD

1 h) Three-Phase Four-Wire Single Tariff Meter withCurrent and Voltage Transformers

FIG. 1 STANDARDCONNECTIONDIAGRAM

9 PACKING

9.1 Meters shall be suitably packed in order to avoidany damage or disturbance during transit or handling.General recommendations for packing of meters aregiven in Annex E,

10

10 CONDITIONS FOR TESTS

10.1 Unless otherwise specified, tests shall be carriedout under the following conditions.

10.1.1 The meter cover shall be in position.

10.1.2 For drum type registers, only the most rapidlymoving drum shall be turning.

10.1.3 Before any type test is performed, the voltagecircuits shall have been energized for at least:

a) 4 h for Class 0.5 meters,

b) 2 h for Class 1 meters and worse, and

c) 1 h for Class 2 meters and worse,

and the measuring current shall be set progressivelyto increasing or decreasing values and the currentcircuits shall be energized at each value for a sufficienttime to obtain thermal stability with correspondingconstant speed of rotation.

10.1.4 In addition, for polyphase meters:

a) the phase sequence shall be as marked onthe diagram of connections, and

b) the voltages and currents shall besubstantially balanced ( see Table 7 ).

10.1.5 The reference conditions for various influencequantities shall be as specified in Table 8.

10.1.6 Test equipment shall be as per IS 12346.

11 TESTS

11.1 Classification of Tests

11.1.1 Type Test

Test schedule shall be as given in Table 9.

11.1.1.1 Number of samples and criteria for conformity

Type tests shall be applied to three test specimens,in the event of one specimen failing to comply in anyrespect, further three specimens shall be taken all ofwhich shall comply with the requirement of thisstandard.

11.1.2 Acceptance Tests

Test schedule shall be as given in Table 10.

11.1.2.1 Recommended sampling plan and criteriafor acceptance

A recommended sampling plan and the criteria foracceptance of the lot are given in Annex F.

11.1.3 Routine Tests

Test schedule and sequence shall be as given inTable 11.

I

I

Is 13010:2002

Table 7 Voltage and Current Balance

( Clause 10.1.4)

Polyphase Meters Class of Meter

‘0.5 1 2’

(1) (2) (3) (4)

Each of the voltage between line and neutral or between *0.5 percent +1 percent ● 1 percentany two lines shall not differ from the average correspondingvoltage by more than

Each of the currents in the conductors shall not differ from *1 percent *2 percent +2 percentthe average current by more than

The phase displacements of each of these currents from the 2° 2° 2°corresponding line-to-neutral voltage irrespective of thepower factor; shall not differ from each other by more than

Table 8 Reference Conditions for Influence Quantities

( Clauses 6.2.5 and 10.1.5)

Influence Quantity Reference Value Permissible Tolerance for Meter of Classr \

0.5 1 2

(1) (2) (3) (4) (5)

Ambient temperature Reference temperature +l°C +2°C +2°Cor in its absence 27°C( see Note 1 )

Working position Vertical working position +0.5° +1” +1”( see Note 2 )

Voltage Reference voltage +0.5 percent +1 percent +1 percent

Frequency Reference frequency, or +0.2 percent +0.3 percent +0. 5 percentin its absence 50 Hz

Wave form Sinusoidal voltage and Distortion factor less thancurrent r 7

2 Y. 2 v. 3 ?40

Magnetic Induction of Magnetic induction equal Induction value which causes variation of error not

external origin at the to zero greater than

reference frequencyr \

( see Note 3 )0.1 v. 0.2 ?/0 0.3 v.

NOTES

1 If the tests are made at a temperature other than the reference temperature, including permissible tolerance, theresults shall be corrected by applying appropriate temperature coefficient of the meter.

2 Determination of vertical working position ( see 6.2 ).

The construction and assembly of the meter should be such that the correct vertical position is ensured ( in both thefront-to-back and left-to-right vertical planes ) when:

a) the base of the meter is supported against a vertical wall, and

b) a reference edge ( such as the lower edge of the terminal block ) or a reference line marked on meter case ishorizontal.

3 The test consists ofi

a) For a single-phase meter

Determining the errors, at first with the meter normally connected to the mains and then after inverting theconnections to the current circuit as well as to the voltage circuits. Half of the difference between the twoerrors is the value of the variation of error. Because of the unknown phase of the external field, the test hasto be made at O.I Ib at unity PF and 0.2 Ih at 0.5 power factor.

b) For a three-phase meter

Making three measurements, at 0.1 lb at cos CD1, after each of which the connections to the current circuitsto the voltage circuits are changed over 120, while the phase sequence is not altered. The greatest differencebetween each of the errors so determined and their average value is the value of variation of error.

11

1s 13010:2002

11.2 Insulation Resistance

The insulation resistance test shall be carried out inaccordance with Table 12. Thevoltage shall reappliedfor a minimum of one minute or more for the pointerof the insulation tester to have come practically torest.

11.3 Running with No Load

With no current in the current circuit(s), the rotor ofthe meter shall not make a complete revolution at anyvoltage between 75 and 110 percent of the referencevoltage.

For cyclometer type registers, these conditions shallapply with only one drum moving.

11.4 Starting

The rotor of the meter shall start and continue to runat the current shown in Table 13.

It shall be verified that the rotor completes at leastone revolution.

For meters with drum-type registers, the test shall bemade with not more than two drums moving.

11.5 Limits of Errors

11.5.1 When the meter is under the referenceconditions ( see 10.1 ) the percentage errors shall notexceed the limits for the relevant accuracy class givenin Table 14 and /or Table 15 as applicable.

The difference between the percentage error when themeter is carrying a single-phase load at basic currentand unity power-factor and the percentage error whenthe meter is carrying a balanced polyphase load atbasic current and unity power-factor, shall not beexceed 1percent, 1.5 percent and 2.5 percent for metersof Class 0.5, 1 and 2 respectively.

NOTE — When testing for compliance with Table 16,the test current should be applied to each element insequence.

11.5.2 For acceptance and routine tests, the errorsshall be determined at the test points specified below:

S1 No. Current Power Factor (Cos 0)

i) 5 percent Zb 1

ii) lb 1

iii) 200 percent lb 1

iv) I mox 1

v) 10 percent Ztr 0.5 lagging

vi) lb 0.5 lagging

vii) 200 percent lb 0.5 lagging

viii) Imax 0.5 lagging

11.6 Tests of Meter Constant

It shall be verified that the ratio between the numberof revolutions of the meter rotor and the indicationof the register is correct.

11.7 Interpretation of Test Results and Adjustment( if Required )

Certain test results may fall outside the limits indicatedin Tables 14 and 15 owing to uncertainties ofmeasurements and other parameters capable ofinfluencing the measurements. However, if by onedisplacement of the zero line parallel to itself by notmore than the limits indicated in Table 16, all the testresults are brought within the limits indicated in Tables14 and 16, the meter shall be considered acceptable.

NOTE — In such a case the meter maybe the readjustedwith the help of break magnet at one point ( say atbasic current and cos @ = 1, as applicable ) to achievethe desired results.

Table 9 Schedule of~pe Tests

(Cfausell.1.1)

S1 No.

(1)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

Test Clause Reference

(2)

Insulation resistance

Running with no load

Starting

Limits of errors

Interpretation of testresults and adjustments(if required )

Test of meter constant

Power 10ss

Heating

Impulse voltage test

ac Voltage test

Effect of influencequantities

Effect of short-circuits

Effect of self-heating

Range of adjustment

Independence of adjustment

Sustained accuracy test

Running at low load

Repeatability of error

Shock

Vibration

Test for material used in dial

Test of protection againstpenetration of dust and water

Mechanical test of meter case

(3)

11.2

11.3

11.4

11.5

11.7

11.6

11.8

11.9

11.10.2

11.10.3

11.11

11.12

11.13

11.14

11.15

11.16

11.17

11.19

11.21

11.20

11.18

11.24

11.25

A—

--4

----

12

IS 13010:2002

Table 10 Schedule of Acceptance Tests

(C/arfsell.l.2)

S1 No.

(1)

1

2

3

4

5

6

7

8

9

Test

(2)

Insulation resistance

Running with no load

Starting

Limits of errors

Interpretation of testresults and adjustments(if required )

Test of meter constant

Power loss ( voltagecircuit )

Shock

Repeatability of error

Clause Reference

(3)

11.2

11,3

11.4

11.5

11,7

11.6

11.8

11.21.1

11.19.1

Table 11 Schedule of Routine Tests

(Clazfsell.l .3)

S1 No. Test Clause Reference

(1) (2) (3)

1 Insulation resistance 11.2

2 ac voltage test 11.10.3

3 Running with no load 11.3

4 Starting 11.4

5 Limits of error 11.5

Table 12 Insulation Resistance Test

( Clause 11.2 )

Test Voltages Point of Application Insulationof Test Voltage Resistance

(1) (2) (3)

500 + 50V DC a) Between frame and 5 Mohmscurrent circuits,voltage circuits,if any, all connectedtogether

b) Betweeneach current 50 Mohmscircuit ( or voltagecircuit ) and each andevery other circuit

NOTE — Where two or more voltage circuits arepermanently joined together, the combination may betreated as one circuit for this test.

Table 13 Starting Current

( Clause 11.4 )

Accuracy Class of Meters

0.5 1 2

Percentage of 0.4 0.4 0.5Basic Current

Power Factor 1 1 1

11,

Table 14 Percentage Error Limits ( Single-PhaseMeters ) and Polyphase Meters with Balanced j

L@is

(Clauses 11.5.1 andll.7)

Value of Current PF Percentage Error Limitsof Meters for Class

(1) (2)

0.05 Ib 1

Fmm O.1Ibtolmax 1

O.llb 0.5 lag

0.8 lead

From0.2 lb to hum 0.5 lag

0.8 lead

When specially 0.25 lagrequested by user 0.5 lead

from 0.2 lb to fb

0.5 1.0 2

(3) (4) (5)

+1.0 *1.5 &2.5

+ 0.5 * 1.0 ● 2.0

+1.3 * 1.5 * 2.5

* 1.3 *1.5

* 0.8 * 1.0 + 2.0

* 0.8 +1.0

* 2.5 ● 3.5 —● 1.5 * 2.5 —

Table 15 Percentage Error Limits ( PolyphaseMeters Carrying a Single-Phase Load, but withBalanced Polyphase Voltage Applied to Voltage

Circuits )

( Clauses 11.5.1 and 11.7)

Value ofCurrent

(1)

From 0.2 fbto Ib

0.5 lb

lb

Abovelb toI max

PF of the Percentage ErrorRelevant Limits for MetersElement of class

~

(2) (3) (4) (5)

1 *1.5 k2 *3

0.5 lagging ● 1.5 k 2.0 —

0.5 lagging ● 1.5 ● 2.0 * 3.0

l—— * 4.0

Table 16 Interpretation of Test Results

(Clauses 11.5.1 andll.7)

Class of Meter~

Permissible displacement 0.3 0.5 1.0of the zero line ( percent )

11.8 Power Loss

a)

b)

Voltage Circuits — The active and apparentpower loss in each voltage circuit of a meterat reference voltage, reference temperatureand reference fkequency shall not exceedthe values shown in Table 17.

Current Circuits - The apparent power takenby each current circuit of a directly connected

13

Is 13010:2002

meter at basic current, reference frequency

and reference temperature shall not exceedthe values shown in Table 18 for meters withbasic current less than 30A.

The apparent power, taken by each current circuit ofa meter connected through a current transformer, shallnot exceed the value shown in Table 18 at a currentof the corresponding transformer at referencetemperature and’reference frequency of the meter.

Table 17 Power Loss

Meters Class of Meter~

Single-phase 2Wanct8VA 1.2 Wand6VA

l’olyphase 2Warrd 10VA 1.2 Waod6VA

Table 18 Apparent Power Loss

( Clause 11.8)

Meters Class of Meter~

Single-phase and polyphase 6.0 VA 4.0 VA 2.5 VA

NOTE — The rated secondary current is the value ofthe secondary current of a current transformer on whichthe performance of the transformer is based. Standardvalues of rated extended secondary current are 120percent, 150percent and 200 percent of the ratedcurrent.

11.9 Heating

Under normal conditions of use, windings andinsulation shall not reach a temperature which might

adversely affect the operation of the meter. With each

current circuit of the meter carrying rated maximumcurrent and with each voltage circuit (and with these

auxiliary voltage circuits which are energized for periodsof longer duration than their thermal time constants)carrying 1.25 times the reference voltage, thetemperature rise of the respective parts shall not exceedthe values given in Table 19 with an ambienttemperature not exceeding 40”C.

During the test, the duration of which shall be 2 h,the meter shall not be exposed to draught or directsolar radiation.

Tabl&19 Heating

(Clause 11.9)

Part of Meter Temperature Rise, “C

Windings 60

External surfaces of the case 25

!?

&

‘i\a”

After the test, the meter shall show no damageii~,(~

and shall comply with the voltage tests as specifiedin 11.10.2 and 11.10.3. ,,,

,,

Except for the requirements relating to the temperaturerise of the windings specified in Table 19, the insulationmaterials shall comply with the appropriate requirementsofll.2. +

%,,

The temperature rise of the windings shall be determined $

by the variation of resistance methods. The Ii

measurement shall be carried out at the point ofconnection between the current windings and therespective terminal.

For the measurement of circuit resistance, the cableto be used for energizing the meter shall have a lengthof about 1 m and a cross-section such that the currentdensity is less than 4 A/mm*.

11.10 Test of Dielectric Properties

11.10.1 General Test Conditions

The test shall be carried out only on a complete meterwith its cover (except when indicated hereafter) andterminal cover, the terminal screws being screwed downto the maximum applicable conductor fitted in theterminals. Test procedure shall be in accordance with1S2071 (Partl ).

After these tests, there shall be no change at referenceconditions in the percentage error of the meter greaterthan 50 percent of the class index of the meter. Thesetests shall be carried out only in meter.

During type tests, the dielectric property tests areconsidered to be valid only for the terminal arrangementof the meter which has undergone the test. Whenthe terminal arrangements differ, all the dielectricproperty tests shall be carried for each arrangement.

For the purpose of these tests, the earth has thefollowing meaning:

a)

b)

When the meter case is made of metal, theearth is the case itself placed on a flatconducting surface;

When the meter case or only a part of it ismade of insulating material, the earth is aconductive foil wrapped around the meter andconnected to the flat conducting surface onwhich the meter base is placed. Where theterminal cover makes it possible, theconductive foil shall approach the terminalsand the holes for the conductors within adistance of not more than 2 cm.

During the impulse and the ac voltage tests, the circuitswhich are not under test are connected to the earthas indicated hereafter. A flashover ( capacitance

14

.... .

;;

IS 13010:2002

discharge ) is not necessarily a criterion of failure asthis may occur in a position that does not damageand the manufacturer shall decide whether or not toeliminate the cause, provided other criteria ofacceptance are met.

After these tests, there shall be no change at referenceconditions in the percentage error of the meter greaterthan the uncertainty of the measurement.

In this sub-clause, the expression ‘all the terminals’means the whole set of the terminals of the currentcircuits, voltage circuits and, if any, auxiliary circuitshaving a reference voltage over 40 V.

These tests shall be made in normal conditions of use.During the test, the quality of the insulation shall notbe impaired by dust or abnormal humidity.

Unless otherwise specified, the normal conditions forinsulation tests are :

a)

b)

c)

ambient temperature 15 to 45°C,

relative humidity 45 to 95 percent, and

atmospheric pressure 86 to 106 kFa ( 860 to1060 mbar ).-

NOTE — If the ac voltage test is to be repeated, theapplied voltage shall be 80 percent of the specifiedvoltage.

11.10.2 Impulse Voltage Test

The impulse voltage tests are intended to determinethe capability of the meter to withstand, without darnageshort-time over voltages of high values.

The waveform and the generator characteristics shallbe in accordance with IEC61000-4-5 and its peak valueshall be 6 kV. For each test, the impulse voltage isapplied ten times with one polarity and then repeatedwith the other polarity. The minimum time betweenimpulses shall be 3 s.

NOTES

1 For areas where overhead supply networks arepredominant, higher peak vahse than 6 kV of the testvoltage may be required.

2 The aim of the test in 11.10.2.1 is essentially toensure, on the one hand, the quality of insulation ofthe voltage windings between turns or between layersand, on the other hand, the insulation between differentcircuits of the meter which in normal service are connectedto conductors of different phases of the network andbet~en which overvoltage may occur.

3 The test in 11.10.2.2 is intended to provide overallverification of the behaviour of the insulation of allthe electrical circuits in the meter relative to earth. Thisinsulation represents as essential safety factor forpersonnel in the event of overvoltage on the network.The waveform of the impulse is the standardized 1.2/50 and its peak value is 6 kV.

15

11.10.2.1 Tests of insulation for circuits and forinsulation between the circuits

The test shall be made independently on each circuit(or assembly of circuits) which are insulated fromthe other circuits of the meter in normal use. Theterminals of the circuits which are not subjected toimpulse voltage shall be connected to earth,

Thus, when in normal use the voltage and the currentcircuits of a driving element are connected together,the test shall be made on the whole. The other endof the voltage circuit shall be connected to earth andthe impulse voltage shall be applied between theterminal of the current circuit and earth. When severalvoltage circuits of a meter have a common point, thispoint shall be connected to earth and the impulsevoltage successively applied between each of the freeends of the connections ( or the current circuitsconnected to it ) and earth. When in normal use, thevoltage and the current circuit, of the same drivingelement are separated and appropriately insulated( for example, each circuit connected to a measuringtransformer ), the test shall be made separately on eachcircuit.

During the test of a current circuit, the terminals ofthe other circuits shall be connected to earth and theimpulse voltage shall be applied between one of theterminals of the current circuit and earth. During thetest of a voltage circuit. the terminals of the voltagecircuit under test shall be connected to earth, andimpulse voltage shall be applied between the otherterminal of the voltage circuit and earth. The auxiliarycircuits intended to be connected either directly tothe mains or to the same voltage transformers as themeter circuits and with a reference voltage over 40 V,shall be subjected to the impulse voltage test in thesame conditions as those already given for voltagecircuits. The other auxiliary circuits shall not be tested.

11.10.2.2 Test of insulation of electric circuits relativeto. earth

All the terminals of the electric circuits of the meter,including those of the auxiliary circuits with a referencevoltage over 40 V, shall be connected together. Theauxiliary circuits with a reference voltage below orequal to 40 V shall be connected to earth. The impulsevoltage shall be applied between all the electric circuitsand earth.

11.10.3 ac Voltage Test

The ac voltage tests shall be carried out in accordancewith Table 20.

The test voltage shall be substantially sinusoidal,having a frequency between 45 Hz and 65 Hz, andapplied for one minute. The power source shall be

,.

IS 13010:2002

capable of supplying at least 500 VA, 11.11.1 Inf7uence of Ambient Temperature

During the tests relative to earth the auxiliary circuitswith reference voltage equal to or below 40 V shallbe connected to earth.

The determination of the mean temperature coefficientfor a given temperature shall be made over atemperature range O,20”C, 10°C above and 10°C belowthat temperature, but in no case shall the temperaturebe lower than O°Cor higher than 40”C.

11.11 Effect of Influence Quantities ( Table 22)

When determining the effect of an individual influencequantity, the conditions and the values of all otherinfluence quantities shall be as stated in 10.1.5.

The mean temperature coefficient shall in all casesbe determined at least for the reference temperatureand shall not exceed the limit given in Table 21.

The following influence quantities taken intoconsideration for fixing the above reference conditionsand evaluating their effect on the results of varioustests are given in clause 11.11.1 and Table 22:

11.11.2 Other influence quantities shall be as givenin Table22.

11.12 Short-Time Over Currents

a)

b)

c)

d)

e)

o

g)

h)

i)

Ambient temperature,

Oblique suspension,

Voltage,

Frequency,

Magnetic induction of external origin, 0.5 mT( see Note 1 ),

Waveform, ( see Note 2 ),

Reversed phase sequence ( see Note 3 ),

Magnetic field of an accessory ( seeNote 4 ), and

Mechanical load of register ( see Note 5 ).

The test circuit shall be practically non-inductive. Afterthe application of the short-time over current with thevoltage maintained at the terminals, the meter shallbe allowed to return to the initial temperature withthe voltage circuits energized for one hour individually.

The meter shall be able to carry for 0.5 second, a currentequal to:

a) 30 Zbfor direct connection up to 10A,

b) 20 lb for direct connection above 10A, and

c) 10 lb for meters connected by currenttransformer(s).

After this test, the variation of the error shall not exceedthe value shown in Table 23. .-

,

Table 20 ac Voltage Tests

( Clause11 .10.3)

Test Voltage (rms) Points of Application of the Test Voltage

2 kV a) Test to be carried out with the case closed, and terminal cover in place:

1) On the one hand all the current and voltage circuits as well as the auxiliary circuitswhose reference voltage is over 40 V, connected together; and, on the otherhand, earth

2) Between circuits not intended to be connected together in service.

b) Additional tests for insulating encased meters of protective Class 2 between:

4 kV

40 v

1)

2)

3)

NOTES

on the one hand all the [ for test (a) ] current and voltage circuits as well as theauxiliary circuits whose reference voltage is over 40 V,connected together, andon the other hand, earth ( see Note 1 ).

a visual inspection for [ for test (c) ] compliance with the conditions of 6.7between

on the one hand all conductive parts inside the meter, connected together and,on the other hand, all conductive parts outside the meter case that are accessiblewith the test finger, connected together ( see Note 2 ).

1 The test in (b)(1) is to be carried out, with the case closed, the cover and terminal cover in place.

2 The test in (b)(3) is not necessary, if test in item (b)(2) leaves no doubt.

16

Is 13010:2002

Table21 Temperature Coefficient

(Clause ll.11.1)

Value of Current Power Factor Mean Temperature Coefficient(Percentage/°C) for Meters of Claw

0.5 1 2

(1) (2) (3) (4) (5)

From O.1Ibtolmax 1 0.03 0.05 0.10

From 0.2 lb tolmax 0.5 lag 0.05 0.07 0.15

Table 22 Influence Quantities

(CL.mresll.llarrdll.ll .2)

Change in the Value ofthe Influence Quantitieswith Respect to Reference

Conditions

(1)

Oblique suspension 3

Value of Current( Balance Load Unless

Power Limits of Variation in PercentageFactor Error for Meters of Class

Otherwise Stated

(2)

0.05 lblb and lmax

o.l Ib0.5 lmax0.5 Imax

0.1 lb0.5 Jmax0.5 lmax

Ib

lb

0.5 )b to /max0.5 lb ( Singlephase load )

0.05 lb

0.05 lb

)0.5

(4)

1.50.3

0.80.50.7

0.70.60.8

1.5

1

(5)

2.00.4

I .00.71.0

1.00.81.0

2.0

2

(6)

3.00.5

1.51.01.5

1.51.31.5

3.0

(3)

11

1I

0.5 lag

11

0.5 lag

1

Voltage 10 percent

Frequency 5 percent

Magnetic induction of externalOrigin 0.5 mT (1)

Wavefrom 10 percent of thirdharmonic in Ib the current (2)

1 0.5 0.6 0.8

Reversed phase sequence (3) 1.5 1.5 1.5 ~..

2.0

0.5

1

1

2.0

0.3

2.0

1.0Magnetic field of an accessory(4)

Mechanical Ioad of either single-or multi-rate register (5)

NOTES

0.8 1.5 2.01

1 A magnetic induction of external of 0.5 mT produced by a current of the same frequency as that of the voltageapplied to the meter and under the most unfavorable conditions of phase and direction shall not cause a variation inthe percentage error of the meter exceeding the values shown in the table.

The magnetic induction may be obtained by placing the meter in the center of a circular coil, 1 m in mean diameter, ofsquare section and of small radial thickness relative to the diameter, and having 400 ampere turns.

When being tested, the meter shall be placed in the center of the coil, and the plane of the coil shall be vertical andperpendicular to the back of the meter case.

2 The distortion factor of the voltage shall be less than 1percent. The variation in percentage error shall be measuredunder the most unfavorable phase displacement of the third harmonic in the current compared with the fundamentalcurrent.

3 Such an accessory, enclosed in the meter case, is energized intermittently, for example, the electromagnet of a multi-rate register.

It is preferable that the connection to the auxiliary device(s) be marked to indicate the current method of connection.When these connections are made by means of plugs and sockets, these connections should be irreversible.

However, in the absence of those markings or irreversible connections, the variations of errors shall not exceed thoseindicated in the table if the meter is tested with the connections giving the most unfavorable condition.

4 The effect is compensated when calibrating the meter.

5 The effect of mechanical load of register is determined by determining the percentage errors, with and without theregister mechanism.

IS 13010:2002

Table 23 Variation Due to Short-TimeOver Currents

(Clau.sell .12)

Variation in Vatue of Power Limits ofError Current Factor Percentage for

Meters of Class

0.5 1 2

Direct connection h l— 1,5 1.5

Current through lb 1 0.3 0.5 1.0current transfor-mers

11.13 Effect of Self-Heating

After the voltage circuits have been energized atreference voltage for at least 4 h, 2 h and 1h for Classes0.5, 1 and 2 respectively, without any current in thecurrent circuits, the rated maximum current shall beapplied to the current circuits. The meter error shallbe measured at unity power-factor immediately afterthe current is applied and then at intervals shortenough to allow a correct drawing of the curve of errorvariation as a fimction oftime. The test shall be carriedout for at least 1 h and in any event until the variationof error during 20 min test duration does not exceed0.2 percent,

The same test shall then be carried out at 0.5(lagging ) power factor. The variation of error,measuredas specified, shall not exceed the values given inTable 24.

Table 24 Variation Due to Self-Heating

Value of Power Limits of CurrentCurrent Factor Variation in Percentage

Error for Meters of Class

0.5 1 2’

lmax 1 0.5 0.7 1.0Imax 0.5 lag 0.7 1.0 1.5

11.14 Range of Adjustment

Generally, suitable means of adjustment are provided.By agreement between user and manufacturer, the latermay produce meters without means of furtheradjustment.

provisions of Table 25 shall not effect the rotor speedat 50 percent of rated maximum current, 0.5 power factorlagging by more than 0.8 percent for single-phase metersand 2 percent for three-phase direct connection andtransformer operated meters of Class 2.

11.15.2 Inductive Load Aq’justment

A total adjustment of 1 percent made under theprovisions of Table 25 shall not effect the rotor speedat 5 percent of the basic current, unity power factor,by more then 1.0 percent.

11.16 Sustained Accuracy Test

11.16.1 An initial test of accuracy shall be carriedout at the rated voltage and fi-equency at the followingloads and percentage error noted:

a) Rated maximum current, unity power factor;

b) At basic current, unity power factor; and.,

c) 5 percent basic current, unity power factor.

11.16.2 After initial test, the meter shall be runpreferably continuously at approximately ratedmaximum current, rated voltage and unity power factor,up to a registration in kWh numerically equivalent to1000 h. On completion of this run the meter shall beretested as in 11.16.1 and the percentage error shallnot differ by more than 50 percent of class indexfrom the error of the meter under initial testcondition 11.16. l(a) and (b) and 100 percent of classindex for test condition 11.16.1 (c).

11.16.3 After this test, the condition of bottom bearing( except magnetic suspension bearing) shall not showany undue wear when examined under microscope.

11.17 Running at Low Load

The meter shall pass low load run test. The countershall be set at 9999.8 or 99999.8 as the case maybe. At 10 percent lb and UPF, the counter shouldrun smoothly up to 0000.1 or 00000.1 as the case maybe,

11.18 Test on Material Used in the Dial

In case the material used for dial is synthetic materialthen it shall be tested with particular reference.to boilingwater test as follows:

A meter provided with means of adjustment and which The accuracy of the meter shall be recorded at 10percent

has been adjusted satisfactorily according to this lb UPF and then the counter of the meter removed

standard shall be capable of being further adjusted and suspended in boiling water for 5 min and again

at least to the extent shown in Table 25. Test shall be replaced in the meter, after it has attained the ambient

made under the conditions stated in 10. temperature. The meter shall again be checked foraccuracy at 5 percent lb UPF, and change in error thus

11.15 Independence of Adjustment observed shall not be more than 1 percent and the

11.15.1 Low Load Adjustment error should also be within limits as specified in thisstandard. There should not be any visual change in

A total adjustment of 4 percent made under the the material of the dial.

18

.,

IS 13010:2002

Table 25 Minimum Range of Adjustment

(C/ause 11,14)

Adjustment of Speed Value of Current Power Factor Minimum Range of Adjustment ofof Rotation of the Rotor Percentage for Meters of Class

‘ 0.5 1 2’

Braking Element 0.5 Imax 1 *2 *2 *4

LOW load 0.05 lb 2 *2 *2 *4

Inductive load 0.5 lb 0.5 lag *I +1 —

0.5 lmax 0.5 lag — — *1

NOTE — For polyphase meters, the verification of the range of adjustment for inductive load should be made on eachdriving element and should be determined when the current circuit of each element is carrying half the basic currentlagging 60 behind the voltage at the terminals of that element, all the voltage circuits of all driving elements carryingbalanced polyphase voltage, whose rms value is equal to the reference voltage in the phase-sequence as indicated on theconnection diagram.

11.19 Repeatability of Error Test ( Type Test)

The test shall be carried out under the rated voltage,rated frequency and unity power factor with thefollowing load currents:

a) 5 percent basic current, and

b) Rated maximum continuous current.

In each of the above load conditions, 20 error testsare to be successively carried out at intervals of atleast half an hour. The variation in error expressedby the difference between the maximum and minimumof the errors so obtained in 20 error tests shall notexceed 50 percent of class index of meter.

11.19.1 As an acceptance test, the test shall be carriedout under the rated voltage, rated fi-equency and unitypower factor at 5 percent basic current.

Six error tests are to be successively carried out inthe above load condition at intervals of 5 min. Thevariation in meter error as expressed by the differencebetween the maximum and the minimum of the errorsso obtained shall not exceed 50 percent, of class indexof meter,

11.20 Vibration Test ( ~pe Test )

The meter shall be subjected by the method specifiedin IS 9000 (“Part 8 ) to vibrations as detailed below:

a)

b)

c)

d)

e]

f)

Range and sweep frequency: 10-150-10 Hz,

Cut-off frequency: 16.7 Hz,

Amplitude ( between 10 Hz and 16.7 Hz):4 mm peak to peak,

Acceleration ( between 16.7 Hz :2.2 g ) =acceleration due to gravity,

Sweep rate : one octave per minute, and

Duration: Along three mutually perpendicularaxes ( in the directions of upper and lower,right and left, back and forth ).

The test shall be conducted on a different specimenfor each direct ion of vibration.

Afler conclusion of the test, the variation of metererror shall not exceed 50 percent of accuracy classindex at basic current, 5 percent basic current andmaximum current at unity PF and shall satisfy the limitsof error, starting, non-registration with voltage aloneand repeatability of error test.

11.21 Shock Test ( Type Test)

The meter shall be subjected to shock test by methodspecified in Section 1 of IS 9000 ( Part 7 ) to shocksas described below:

a) Peak acceleration 400 m/s2 (40 g )

b) Pulse shape Half sine wave

c) Pulse duration 18ms

d) Number of shocks: two in both directions ofthree mutually perpendicular axes includingthe rotor axes.{ ( Total of 12 shocks )

This test shall be conducted on a different test specimenfor each direction of shock (also on a specimen differentfrom one to be used for the vibration test). Afierconclusion of test, the variation of meter error shallnot exceed 50 percent of accuracy class index at basiccurrent, 5 percent basic current and maximum currentand shall satisfy the limits of error, starting, non-registration with voltage alone and repeatability oferror test.

11.21.1 Shock Test (Acceptance Test )

When determined in accordance with the followingmethod, the meter shall show no signs of internalphysical change ,and the variation in percentage errordue to shock shall not exceed the limits specified inTable 26:

a) Determine the percentage error of the meter

19

IS 13010:2002

,,‘I+’—

under the load conditions specified in Table 26;

b) Suspend the meter alone on a cord in anupright position;

c) Strike the meter six times, twice on the leftside, twice on the right, and twice on the back;each time on a solid part of the meter base inthe horizontal line of the disc ( or a disc ),with a rawhide hammer of 300 g allowed, toswing under gravity through 90 degrees at300 mm radius;

NOTE — Damage at the case is not a criterion of failure.

d) Again determine the percentage error of themeter under load conditions specified inTable 26, and

e) Calculate the variation in percentage errorfor each load condition.

n&$J&_7 PmrHAMMER I

Ill ...S i

II-.. —

II II NJ’OIN1 OF CON1aCT

*L I

FIG. 2 APPARATUSFOR SHOCKTEST

Table 26 Effect of Shock

(C/az4sell.21.1)

Load Conditionsi) Max Variation in( for Each Current Percentage Error

Circuit )

5 percent fb ( PF = 1 )

1

50 percent of class indexfb(PF=l) of metersfb(PF=O.51ag) J

I)polyphase meter with balanced load.

11.22 Driving Torque Measurement Test”

The driving torque of a meter at basic current and unitypower factor shall be measured for at least five samplesin accordance with the method given in 11.10 ofIS 9792( Part 1 ). The average value of torque fromfive samples shall be considered as the nominal torquefor the purpose of determining efflciencylperrnanencefactor specified in Annex D. However, the individual

torque values shall not differ from the nominal valueso obtained by more than 10 percent.

11.23 Test of Resistance to Heat and Fire

The test shall be carried out according toIS : 11000 ( Parts 1 and 2 ) with the followingtemperature:

a) terminal block: 960+ 15“C;

b) terminal cover and meter case: 650+ 10”C;and

c) duration of application: 30* 1 sec.

11.24 Test of Protection Against Penetration ofDust and Water

The test shall be carried out according to IS 12063under the following conditions:

a) Protection against penetration of dust:

—

—

—

Meter in non-operating condition andmounted on an artificial wall.

The test should be conducted with samplelengths of cable ( exposed and sealed)of the types specified by themanufacturers in place.

1st characteristic digit: 5 ( IP 5X ) resp.

Any ingress of dust only be in a quantitynot impairing the operation of the meter,and not impairing its dielectric strength( insulating strength). For testing, seeclause 11.2.

b) Protection against penetration of wate~ Meterin non-operating condition secondcharacteristic digit : 1 ( ZPXI ) Any ingressof water must only be in a quantity notimpairing the operation of the meter and notimpairing its dielectric strength (insulatingstrength). For testing, see 11.2.

11.25 Mechanical Strength of Meter Case

The mechanical strength of the meter case shall betested with a spring,hammer ( IEC 60068-2-75 ).

The meter shall be mounted in its normal workingposition and the spring hammer shall act on theouter surfaces of the meter cover ( includingwindows ) and on the terminal cover with a kineticenergy of 0.2 J& 0.02 J.

The result of the testis satisfactory if the meter caseand terminal cover do not sustain damage which couldaffect the fimction of the meter and it is not possibleto touch live parts. Slight damage which does notimpair the protection against indirect contact or thepenetration of solid objects, dust and water isacceptable.

,----

.:“ A

,.

20

&

Is 13010:2002

ANNEX A

(F’oreword)\

NOTE ON CLASS 0.5 ac ELECTRICITY METERS

A-OGENERAL use of reference standards of high accuracy, low

A-O.1 Class 0.5alternating currentwatthour meters ,distortion supply sources and highly qualified and

areemployedchiefly formeasurementof largeamountsexperienced personnel for its operation.

of energy but where the load is very small.

A-O.2’This class of meters constitutes a particularcatego~ which is not entirely in line with the seriesClass 1 and Class 2.

A-1 EFFECT OF INFLUENCE FACTORS

A-1.l The effect of influence factors ( frequency,voltage, etc ) is generally less than that for Class 1and Class 2, but not necessarily in strict proportionto the class indices.

A-2 TESTING

A-2.1 The testing of this class of meters requires the

IS No.

1401:1970

8530:1977

9000 ( Part 7/

Sec 1 ): 1979

(Part 8): 1,981

9792(Part l):1987

llooo(Partl/Secl ): 1988

A-2.2 Owing to large quantities of energy to bemeasuredwithClass 0.5 alternatingcurrentto watthourmeters, it is necessary for them to be verified morefrequently than Class 1 and Class 2 meters.

A-3 INSTALLATION

A-3.1 The installationof these metersshouldbe carriedout with great care, eliminating or reducing to aminimum,external influence factors such as magneticfields, non-verticality ‘and the range of ambienttemperature.

ANNEX B

( Clause2.1)

LIST OF REFERRED INDIAN STANDARDS

Title

Accessibility test probes ( jlrstrevision )

M&rnun demand indicators, Class 1

Basic environmental testingprocedures for electronic andelectrical items: Part 7 Impact test,Section 1 Shock

Basic environmental testingprocedures for electronic andelectrical items: Part 8 Vibration( sinusoidal) test

Guide for testing, calibration andmaintenance of AC electricitymeters:Part 1 Single phase whole currentwatthour meters, Class 2.0 ( firstrevision )

Fire hazard testing: Part 1 Guidancefor the preparation of requirementsand test specifications for assessingf~e hazard ofelectronic and electricalitems, Section 1 General guidance

IS No.

llooo(Partl/Sec2): 1988

11426:1985

1

11731(Part l):1986

12063:1987

12346:1999

Title

Fire hazard testing: Part 1 Guidancefor preparation of requirements andtest specifications for assessing firehazard of electronic and electricalitems, Section 2 Guidance forelectronic items

Specification for alternating currentprecision kilowatt-hour meters ofClass 0.5 for testing purposes

Methods of test for determinationof flammability of solid electricalinsulating materials when exposedto an igniting source: Part 1Horizontal specimen method

Classification of degrees ofprotection provided by enclosuresof electrical equipment.

Testing equipment for ac electricalenergy meters (first revision )

IS 13010:2002

IS No. Title IS No. Title

12360:1988 Voltage bands, for electrical 14451 Telemetering of consumption andinstallations including preferred (Part 1): 1998 demand: Part 1 Inpulse transmittingvoltages and frequency and receiving devices

ANNEX C

( Clause 6.4.1.3)

RECOMMENDED METHODS OF CONNECTION OF CURRENT CIRCUITCONDUCTORS TO METER TERMINALS

C-O The current circuit conductors of a meter shallbe connected to its current terminals inside the meterbase adopting any of the following recommendedmethods so as to ensure satisfactory, durable andadequate contact surfaces between the conductorsand the terminals.

C-1 The ends of current coils, would form roundsection wire or flat strip shall be formed into loops.Each complete loop shall be accommodated betweena flat section of the top end of a current terminal anda flat rectangular or circular washer plate having centralhole, the three being pressed together by a screw havingsuftlciently large head to cover the loop. The curreqtterminal shail have thread for fixing of the screw. Thewasher plate shall be of good conducting material andshall have spring action.

C-2 Current coils having rectangular sectionconductors of sufficient width shall have flatlenedends. Each end shall be accommodated between aflat section of the top end of a current terminal and

a flat rectangular or circular washer plate, the threebeing pressed together by a screw having sufllcientlylarge head to cover the flattened end of the currentcoil. The washer plate shall have holes for clearpassage of the screw and the current terminal shallhave thread for fixing of the screw. The washer plateshail be of good conducting material and shall havespring action. In order to ensure proper gripping ofthe screw head, the central hole of the washer plateand the corresponding part of the screw head maybe countersunk.

C-3 In case where methods given in C-1 and C-2cannot be satisfactorily adopted, specially where anumber of rectangular section conductors or stripsor wires have been used, the ends of current coilsshall be terminated into elongated soldering-cum-crimping sockets having machined flat bottom endswhich shall then be connected to meter currentterminals by adopting method given in C-2. Thesoldering socket shall be of the same material as thatof the current terminal.

ANNEX D

( clauses 6,12 and 11.22)

RECOMMENDED GUIDELINES FOR CONSTRUCTIONAL FEATURES

1) Meter @ame a)Mono blockDesign b)

2) Terminal block a)( see 6.4 andAnnex C ) b)

c)

Die cast alurninium alloy, 3) Meter fixingorRigid CRC steel tie

Moulded with terminalsin phenol formaldehyde 4) Meter cover andReplaceable terminal base, terminalMoulded in tough covermoulding compound as $) Counter flameabove

22

2 or 3 pointa fixing forsingle-phase meters and3 points fixing for threephase meters

D. D. Grade steel/ bakelite/polycarbonate, with waterldustproof groove

Sheet brass/sheet aluminium/diecast aluminium

,.

Is 13010:2002

9

n

8)

9)

10)

11)

12)

13)

14)

15)

16)

E-1

Anti-creep device

Terminal cover

Window glass

Earth terminal(s)

Reverse stop device

Brake magnet

Electromagnet

Air gap in magneticpath ( with discremoved )

Clear gap above andbelow rotor disc inthe electromagnet

Registeringmechanism

Lower bearing

Adjustable, attraction typeor anti-creep holes on therotor disc

Short or extended cover,sealing with one or twoscrews with sealing hole

Preferably toughened glass

As specified in 6.4.4

The reverse running stopdevice shall be moulded pauland cam type provided forthe rotor

Material of the BrakeMagnet-The material of thebrake magnet shall be ofALNICOGradeVorALMCOGrade VI Number of Polesof magnet — The number ofpoles of the brake magnetshall be preferably 4

Cold-rolled non-grainoriented silicon steel core.Winding made of EC gradecopper conductors

The air gap of electro-magnets and brake magnetshall be minimum 2.2 mmand the gap shall be uniform

Not less than 0.5 mm

As specified in 6.10 and 11.8

Lower bearing shall be eitherdouble jewel or magneticsuspension bearing. Thequality of meter should beassured with the type ofbearing used

17) Top bearing

18) Permanence factor

19) Efficiency factor

20) Material for screwswashers and otherfastness

21) Current densityat Imax

22) a) Minimumclearancebetweenwindow glassand rotor disc

ii) Minimumclearance forsingle piecetransparentmouldedcover

23) Noise

24) Provision forsealing andpilfer-proofarrangement

The upper bearing shallbe hardened and highlypolished rust-resistingstainless steel pin. Topbearing pin should becentered properly andshould have proper strengthso that rotor disc can movefreely

Minimum 1.2

Minimum 1.2

All electrically live screwshall be brass/nickel ortinplated and all other steelgalvanized or plated

6.2 A/mm2 maximum subject”to maximum temperature risespecified

8mm

8mm

So small as to be inaudibleat a distance about 1 m tlomthe meter located in a silentplace

Shall be provided

NOTE — Where more than one alternative has beenindicated for a constructionalfeature, the utilities mayindicatetheir specific preference between the alternatives.

ANNEX E

( Clause 9.1 )

RECOMMENDATIONS FOR PACKING OF METERS

SINGLE- PHASE AND POLYPHASEMETERS

E-1.l Adequate provisions may be made to suitablyimmobilize the rotor to avoid any damage ordisturbance to the movement during transit.

23

E-1.2 Each meter may be suitably packed in the firstinstance to prevent ingress of moisture and dust, andthenplaced ina cushioned cartonof a suitable materialto prevent damage due to shocks during transit. Thelid of the carton maybe suitably sealed.

----

,’

.>

“J&

Is 13010:2002i

E-1.3 A suitable number of sealed cartons may be in transit.packed in a case of adequate strength with extracushioning, if considered necessary. The cases may E-1.4 The packing cases should be markedto indicate

1’

:.

then be properly sealed against accidental opening the fragile nature of the contents.

ANNEX F ~

( Clause 11.1 .2,.1 ) *,

RECOMMENDED SAMPLING PLAN.

F-1 LOT

F-1. 1 In any consignment, all the metersof the sametype and rating manufactured by the same factoryduring the same period shall be grouped together toconstitute a lot.

F-1.2 Sample shall be tested from each lot forascertaining the conformity of the meters to therequirements of specified acceptance test.

F-2 SCALE OF SAMPLING

F-2. 1 The number of meters to be selected from th~lot depends upon the size of the lot and shall be inaccordance ,with Table 27.

Table 27 Sampling Plan

( Clauses F-2.1 andF-3. 1 )

Lot Size Nil) N22J ( N1+N2 ) Cl C2

(1) (2) (3) (4) (5) (6)

up to 300 8— 8 o—

301 to 500 13 13 26 ,0 2

501 to 1 000 20 20 40 03

1001 and above 32 32 64 14

1)Size of first sample.2, Size of second sample.

F-2.2 The meters shall be taken at random fkom thelot. The procedure given in IS 4905 maybe adopted.

F-3 NUMBER OF TESTS AND CRITERIA FORACCEPTANCE

F-3.1 Tests for Running with No Load, Starting

A sample of N 1 meters selected according to COI2 of

Table 27 shall be tested for the above tests. Anymeter failing in any one of these tests shall beconsidered defective. If the number of defectivefound in the sample is less than or equal to C 1, thelot shall be considered to be. conforming to thesetests. If the number of defective is greater than orequal to C2, the lot shall be considered as not +,

conforming to these tests. If the number of defectiveis between C 1 and C2, a further sample of N2 metersshall be taken according to CO13 of Table 27 andsubjected to these tests. If the number of defectivein two samples combined is less than C2, the lot shallbe considered as conforming to these tests, otherwiseit maybe rejected.

F-3.2 Testafor Insulation Resistance, L]mits of Error ‘and Interpretation of Tests Results and Adjustment ,.-

( If Required ) ),i

From the sample of meters which have been drawnaccording to F-3.1 and those that have passed alltests of F-3.1, a sample of 8 meters shall be tested,all of which shall pass for conformity to these tests.If any one of the meters fails in any of these tests,the whole lot shall be declared not conforming to therequirements of these tests.

F-3.2.1 From sample of meters which has been drawnaccording to F-3.1, three additional samples shall bedrawn for each of the remaining acceptance tests.

F-3.3 The lot shall be considered as conforming to .,

this standard, if provisions of both F-3.1 and F-3.2are satisfied.

24

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau Of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. NO part ofthese publications maybe reproduced in any form withoutthe prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright be addressed to the Director (Publications), BIS,

Review of III.!ian Standards

Amendments are issued to standardsas the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken Up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc : No. ET 13( 5043 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams: ManaksansthaTelephones: 3230131,3233375,3239402 ( Common to all offices)

Regional Offices: Telephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg

{3237617

NEW DELHI 110002 3233841

Eastern: 1/14 C. I. T. Scheme VII M, V. I. P. Road, Kankurgachi{

3378499,3378561KOLKATA 700054 3378626,3379120

Northern: SCO 335-336, Sector 34-A, CHANDIGARH 160022

{

603843602025

Southern: C. I. T. Campus, IV Cross Road, CHENNAI 600113

{2541216,25414422542519,2541315

Western : Manakalaya, E9 MIDC, Marol, Andheri (East)

{8329295,8327858

MUMBAI 400093 8327891,8327892

Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE.FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR.LUCKNOW. NAGPUR. NALAGARH.PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.

Printed at New India Printing Press, Khurja, India

AMENDMENT NO. 1 OCTOBER 2004TO

IS 13010:2002 ac WATTHOUR METERS,CLASS 0.5,1 AND 2 — SPECIFICATION

( First Reviswn )

( Page 5, ckwse 6.2.1) — Substitute the following for the existing:

‘The meter shall have a reasonably dust/moisture-proof case, which shall besealed by the manufacturer in such a way that the internal parts of the meter areaccessible only after breaking such distinctive seal(s).’

( Page 7, clause 6.6) — Substitute the following for the existing:

‘The terminal block, the terminal cover (if not of metal) and the case (if not ofmetal) shall be of a material which complies with the requirement of the testgiven in 1S0 75 for a temperature of 135°C and a pressure of 1.8 MPa(Method A).

NOTE — If the materials of the terminal block, the terminal cover and the case meet thisrequirement the finished meter need not IX tested.’

(ETD 13 )Reprography Unit, BE, New Delhi, India

ANiENDMENT NO. 2 JANUARY 2009TO

IS 13010:2002t3C WATTHOUR METERS,CLASS 0.5,1 AND 2 — SPECIFICATION

(First Revision )

(Page 4, clause 3.43) — Delete.

(Page 4, clause 5.2, Iine 3) — Substitute ‘for example’ jor ‘that is’.

[Page 7, clause 6.6(a)] — Delete and renumber item ‘b)’ as ‘a)’.

(Page 8, clause 6.11, Tide) — Substitute the following for the existing:

‘Direction of Rotation, Marking of the Rotor and Reverse Running Stop’

(Page 8, clause 6.11) – Insert the following new para atler para 2:

‘When reverse running stop is provided to prevent rotation of the rotor contraryto the specified direction, the device shall be capable of restricting such rotationto less than one revolution when maximum current at unity power factor isapplied 180° out of ph~se in each of the metering elements simultaneously.Moreover, as soon as such currents cease to exist, the rotor shall fulfil therequirements of starting in the specified direction.’

(Page 8, .dause 7) — Substitute ‘TORQUWSPEED RATIO’ for theexisting title.

(Page 8, clauses 7.1 and 7.2) — Substitute the following for the existingclauses:

‘7.1 The nominal torque (Tb) of a meter at reference voltage, unity power factorand basic current expressed in gin-cm (see 11.22), and its speed (Sin),determined from meter constant, at reference voltage, unity power factor andmaximum current, expressed in rpm, shall satisfy the following relationship:

Tb x 100/Sm >5.0 for single-phase 2-wire2 13.75 for three-phase 4-wire

NOTE — 1 gm-cm=9.80665 x 10-snewton-meter.;—..

(Page 9, clause 8.1, Note 4, line 1) — Substitute ‘!Q.’ Jor’ l.=.i’.

1

,

Amend No. 2 to IS 13010:2002

[Page 9, clause 8.2.3, Fig. l(a)] – Substitute the following diagram forthe existing diagram:

M

N

1a) Single-Phase Two-Wire Meter

[Puge 9, clause 8.2.3, Fig. 1(b)] — Substitute the following for the existingdiagram:

M

N

1b) Single-Phase Two-Wire Meter Symmetrical Connections

[Page 10, clause 8.2.3, Fig. l(f)] — Substitute the following for theexisting diagram:

2

.

I II ~ll~H . .—- —— . .....-.——... —.. -. .—. —

Amend No. 2 to IS 13010:2002

R

Y

B OACI

N

1f) Three-Phase Four-Wire Single Tariff Meter for Direct Connection

(Page 11, Table 8, col 3, 4 and 5) — Substi~te ‘+/-’ for ‘+’iappears.

(Pa,ge 12, Table 9) — Add the following row after S1 No. 2 andthe subsequent S1 No.:

wherever

renumber

slNo. Test ClauseReference(I) (2) (3)

3 Requirement of prevention of reverse 6.11rotation (if provided)

(Page 12, Table 9) — Add the following row after renumbered S1 No.and renumber the subsequent S1 No.:

S1 No.(1)

Test(2)

Clause Reference(3)

23 Torque/Speed Ratio 11.22

(Page 12, Tabie 9) — Add the following row afler renumbered S1 No. 25:

S1 No. Test(1)

ClauseReference(2) (3)

22

.

26 Verification of general requirements 6and8and markings

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Amend No. 2 to [S 13010:2002

(Page 13, Table 10) — Add the following row after S} No. 2 and renumberthe subsequent S1 No.:

Si No. Test Clause Reference(1) (2) (3)

3 Requirement of prevention of reverse 6.11rotation (if provided)

(Page 13, Table 10) — Add the following row after renumbered S1 No. 10:

SI NO. Test Clause Reference(1) (2) (3)

11 Verification of general requirements 6 and 8and markings

(Page 18, CIUUSC11.18, para 2, line 6) — Substitute ‘ 10 percent Zb UPF,’ “@r L5 percent lb UPF,’.

(Page 19, Table 25, col 3) — Substitute C1‘for ‘2’.

[Page 19, clause 11.20(d)] — Substitute the following for the existing:

‘d) Acceleration (between 16.7 Hz and 150 Hz) :2.2 g (g = acceleration due togravity)’.

[Page 19, clause 11.20(i9] – Substitute the following for the existing:

‘f) Duration : One hour in each direction.

‘g) Direction : Along three mutually perpendicular axes (in the directions ofupper and lower, right and left, back and forth)’.

(Page 20, clause 11.22, line 6) — Substitute ctorque/speed ratio asspecified in clause 7’ for ‘efficiencylpermanence factor specified in Annex D’.

(Page 23, Annex D, Items 18 and 19) — Delete.

(ET 13)Reprography Unit, BIS, New Delh), India

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