Trafo Differential & Distance Prot. Relays

7/16/2019 Trafo Differential & Distance Prot. Relays

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TECHNICAL SPECIFICATION FOR

NUMERICAL TRANSFORMER DIFFERENTIAL

PROTECTION AND DISTANCE

PROTECTION RELAYS

CONTENTS

----------------------------------------------------------------------------------------------------------CLAUSE NO. TITLE PAGE NO.----------------------------------------------------------------------------------------------------------1.0 SCOPE 32.0 STANDARDS 33.0 SERVICE CONDITION 44.0 GENERAL REQUIREMENTS 55.0 GENERAL TECHNICAL REQUIREMENTS 66.0 TESTS 13

7.0 DOCUMENTATION 13

ANNEXURES

A. GUARANTEED TECHNICAL PARTICULARS 15B. SCHEDULE OF DEVIATIONS FROM THE SPECIFICATION 17

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1.0 SCOPE:1.1 This specification covers the design, engineering, manufacture, inspection &

testing at manufacturer's work before dispatch, packing, forwarding anddelivery at discretion of purchaser of Numerical Transformer Differential andDistance Protection Relays with 61850 protocol compliant for 220kV, 132kV &66kV S/Stns. in the state of Unless specifically excluded from the offer, all fittings and accessories, not

specifically stated in this specification but which are necessary for satisfactoryoperation of the scheme or to complete the work in a good workmanship shallbe deemed to have been included in the scope of supply of the successfulBidder.

1.2 Bidders shall carefully check the Technical details of various equipment as per site requirement, if so required, while selecting and offering the equipment.

1.3 This purchase order shall include supply of all items required to complete thesystem not withstanding the fact that any items may have been omitted fromthe specification.

1.5 CO-ORDINATION :

The Supplier shall be responsible for preparing complete wiring diagramcoordinating with existing 220kV, 132kV & 66kV C&R panel boards.1.6 EXPERIENCE: 1.6.1 For 220kV S/Stns.:

The supplier of relays shall be manufacturer of relays and all the mainnumerical relays shall be of his make only.

1.6.2 For 132kV & 66kV S/Stns.: The supplier of relays shall be manufacturer of relays and all the mainnumerical relays shall be of his make only. The supplier’s own make relayincludes the relays manufactured by their Principals/Associates and they havetheir service centre with them.

2.0 STANDARDS : 2.1 The equipment offered shall conform to latest relevant Indian Standards listed

hereunder or equivalent IEC :-

Sr. No. Standard Title

1. IS: 5 Color for ready mix paints.

2. IS: 375 Marking & arrangements for switchgear, bus bars, mainconnections & auxiliary wiring.

3. IS: 694 PVC insulated cable for working voltage upto and including1100 V.

4. IS: 5561 Electric Power Connectors.

5. IS: 4483 Panel Cut-out dimensions for Electrical relays

6. IS: 2419 Dimensions for panel mounted indicating & recordingelectrical instruments.

7. IS :3231 Electrical relays for power system protection.

8. IS :8686 Static protective relays.

9. IS :2147 Degree of protection provided by enclosures for low voltageswitchgear & control gear.

2.2 The works covered by the specification shall be designed, engineered,manufactured, built, tested and commissioned in accordance with the Acts,Rules, Laws and Regulations of India.



2.3 The equipment to be furnished under this specification shall conform to latestissue with all amendments of standard specified above.

2.4 In addition to meeting the specific requirement called for in the TechnicalSpecification, the equipment shall also conform to the general requirement of the relevant standards and shall form an integral part of Specification.

2.5 The Bidder shall note that standards mentioned in the specification are notmutually exclusive or complete in themselves, but intended to compliment eachother.

2.6 The Contractor shall also note that list of standards presented in thisspecification is not complete. Whenever necessary the list of standards shallbe considered in conjunction with specific IS/IEC.

2.7 When the specific requirements stipulated in the specification exceed or differ than those required by the applicable standards, the stipulation of thespecification shall take precedence.

2.8 Other internationally accepted standards which ensure equivalent or better performance than that specified in the standard referred shall also beaccepted.

2.9 In case governing standards for the equipment is different from IS or IEC, thesalient points of difference shall be clearly brought out alongwith Englishlanguage version of standard or relevant extract of the same. The equipmentconforming to standards other than IS/IEC shall be subject to Employer'sapproval.

2.10 The bidder shall clearly indicate in his bid the specific standards in accordancewith which the works will be conformed.

3.0 SERVICE CONDITIONS :3.1 Equipment to be supplied against this specification shall be suitable for

satisfactory continuous operation under the following tropical conditions:-

i) Location IN THE STATE OF HARYANAii) Max. ambient air temp (°C) 50iii) Min. ambient air temp (°C) -2.5iv) Maximum Relative humidity (%) 100v) Minimum Relative humidity (%) 26vi) Average annual rainfall (mm) 900vii) Max. wind pressure (kg/sq. m.) 195viii) Max. altitude above mean sea level(meters). 1000ix) Isoceraunic level (days/Year) 50x) Seismic level (horizontal acceleration) 0.3 gxi) Average number of dust storm 35

(days per annum)Note:-i) Moderately hot and humid tropical climate conducive to rust and

fungus growth. The climatic conditions are also prone to widevariations in ambient conditions.

ii) Air conditioning or any special arrangement for making the controlroom dust proof shall not be provided in any of the S/Stn.

3.2 All control wiring, equipment & accessories shall be protected against fungusgrowth, condensation, vermin & other harmful effects due to tropicalenvironments.

3.3 AUX. POWER SUPPLY :i) A.C. Supply : 415/240 Volts, 3-phase, 4-wire, 50 Hz

Voltage variation : ± 10%



Frequency variation : ± 3%ii) D C Supply : 220 Volts, 2 wire available from S/Stn. battery (insulated)

Variation : ±10%.

3.4 220kV, 132kV & 66kV voltages will be three phase having normal frequency of 50 Hz.

4.0 GENERAL REQUIREMENTS:4.1 MATERIAL & WORKMANSHIP: All material used in the construction of the relays shall be of the best qualityobtainable of their respective kind and whole of the work shall be of the highestclass, well finished and of approved design and make.The draw out mechanism in respect of draw out relays should be smooth andconvenient so as to give adequate service during their use.

4.2 DEPARTURE FROM THE SPECIFICATION:Should the tenderer wish to depart from the provisions of this specificationeither on account of manufacturing practice or for any other reasons, he will

draw specific attention to the proposed points of departure on the prescribedPerforma (enclosed at annexure-B) in his tender and submit such fullinformation, drawings and specifications as will enable the merit of his proposalto be appreciated.In the event of contractor drawings, specification and tables etc. disagreeingwith this specification during the execution of the contract, this specificationshall be held binding unless the departures have been fully recorded asrequired above.

4.3. TESTING EQUIPMENT AND TESTING FACILITIES ON THE RELAYS:The tenderer shall recommend suitable testing equipment (alongwith quantity)

required for field testing of relays offered against this specification. The actualquantity to be ordered shall be determined by the Purchaser. Also adequate testing facilities should be provided on the relay so as to testthem without the necessity of their removal or making any extra connections.The Bidder will clearly indicate the testing procedure to be followed in respectof relays offered.

4.4 Guaranteed test sheets as per Annexure-A shall be submitted by the tenderer.Relevant literature shall be supplied along with the bid for proper appreciationof the offered equipment.

4.5 SUPERVISORY SERVICES:

The tenderer shall offer supervisory services for testing & commissioning of relays included in the specification. The tenderer shall quote their rates on diembasis category-wise with their terms & conditions. The rates quoted should bevalid for at least three years form the date of receipt of equipment by us.

4.6 TRANINING OF PERSONNEL:The contractor will provide free facilities for training the purchaser's technicians/Engineers atsite. The training shall include operation, testing andcommissioning of relays, covering training in detecting faults in relays, completeexplanation of the schematic wiring and wiring schedule of the relays/schemetogether with full understanding regarding the functional modules of the

relays/scheme. The engineers/technicians shall also be provided withrelay/scheme guides/instruction manuals covering drawings of functionalmodules of relays/schemes.



5.0 GENERAL REQUIREMENTS OF RELAYS:The Transformer Differential & Distance Protection relays shall conform to therequirements of IS:3231/IEC-60255/IEC 61000 or other applicable standards.Transformer Differential & Distance Protection Relays shall be suitable for flushor semi-flush mounting on the front with connections from the rear.Transformer Differential & Distance Protection relays shall be in draw out or plug-in type modular cases with proper testing facilities. Necessary testplugs/test handles shall be supplied loose and shall be included in contractor’sscope of supply.Transformer Differential & Distance Protection relays shall be numerical typeand communication protocol shall be as per IEC 61850. Further, the test levelsof EMI as indicated in IEC 61850 shall be applicable to these.For numerical Transformer Differential & Distance Protection relays, thescope shall include the following:

a) Necessary software and hardware to up/down load the data to/from the relayfrom/to personal computer installed in the substation. However, the supply of PC is not covered under this clause.

b) The relay shall have suitable communication facility for future connectivity toSCADA. The relay shall be capable of supporting IEC 61850 protocol (withfibre optical port) and shall be compatible with existing SAS (may be of other make).

c) Numerical relays should have clock (Real Time Clock) with inbuilt battery backup having life span of about 10 years.

d) Numerical relays shall have adequate no. of output contacts and LEDs to meetthe specification / Scheme requirement. All numerical relays shall be suppliedpre-configured as per specification / scheme requirements / approved drgs.

5.1 GENERAL TECHNICAL REQIREMENTS OF NUMERICAL TRANSFORMER

DIFFERENTIAL & DISTANCE PROTECTION RELAYS:-5.1.1 TRANSFORMER DIFFERENTIAL PROTECTION :

The relay shalli) Be triple pole numerical type.ii) Have 3 instantaneous high set over-current units.iii) Have second harmonic restraint or other inrush proof feature and be

stable under normal over fluxing condition.iv) Have fifth harmonic by pass filter or similar other arrangement to

prevent mal-operation of the relay under operating conditions.v) Be suitable for rated current of 1A and include necessary ICTs for ratio

& phase angle correction.vi) Have operating current setting sufficiently low (15% or less) so as tocover practically the whole of the transformer against all types of faults.

vii) Have adjustable bias setting range of 20- 50%.viii) Have maximum operating time of 30milli seconds at 5 times the rated

current.ix) Be provided with necessary terminals & links to measure current in

restraining circuits & in the operating circuits of all the phases under load without making any wiring changes.

x) Cover the lightning arrestors (proposed to be provided very close to thetransformer) in the zone of protection.

xi) The Scheme shall have in-built features of disturbance recorder andevent logger.



For disturbance recorder and event logger features, it shall have 8analog and 16 digital channels (out of which at least 8 shall be externaldigital inputs). It shall have its own time generator and the clock of thetime generator shall be such that the drift is limited to +0.5 seconds/day,if allowed to run without synchronization. Further, it shall have facilityto synchronize its time generator from Time Synchronization Equipmenthaving output of following types.

Voltage signal: (0-5V continuously settable, with 50m Sec. minimumpulse duration)

Potential free contact (Minimum pulse duration of 50 m Sec.)

IRIG-B

RS232CThe recorder shall give alarm in case of absence of synchronizing pulsewithin specified time.

a) The disturbance recorder shall meet the following requirements:

The frequency response shall be 5 Hz on lower side and 250 Hz or better on upper side.

Scan rate shall be 1000 Hz/Channel or better.

Pre –fault time shall not be less than 100 milliseconds and the post faulttime shall not be less than 2 seconds (adjustable). If another systemdisturbance occurs during one post-fault run time, the recorder shallalso be able to record the same. However, the total memory of acquisition unit shall not be less than 5.0 seconds.

b) The event logger shall meet the following requirements:

The time resolution shall be 1milli second.

Cope with up to 40 changes in any one 10milli seconds interval.

The date and time should be printed to the nearest 1milli second

followed by a message describing the point which has operated. Events occurring whilst a previous event is in process of being printed

are to be stored to await printing.Xii) Display resolution of differential/pickup current should be 0.01A (10mA).Xiii) OVER FLUXING PROTECTION:- An over fluxing detecting relay for the

protection of the transformer against over-fluxing conditions shall bewith adjustable setting so as to avoid its operation on momentarysystem disturbances. The relay shall be suitable for 110 Volts. The relayshall have inverse time characteristics, matching with transformer over-fluxing withstand capability curve. The relay shall provide an alarm withv/f setting range of 100% to 130% of rated values and time delay

continuously settable from 0.1 to 6 seconds to draw the operator'sattention about the existence of over-fluxing conditions. The trippingtime shall be governed by v/f versus time characteristics to causetripping of transformer controlling circuit breaker if the over-fluxingconditions continue to exist.

Xiv) OVER LOAD ALARM PROTECTION:- An over current (i.e. singlephase) Protection shall initiating an alarm during transformer overloadcondition with CONTINUOUS VARIABLE setting range of 50-120% of 1Amp. and shall be supplemented by a continuously variable timer of 1to 10 seconds. The relay shall be arranged to sound an alarm when thetransformer exceeds the setting for a given period of time to draw theoperator's attention.



Note:- The over fluxing relay & over load alarm relay shall be in-built withthe numerical differential protection relay with above mentionedspecification requirements.

5.1.2 PROTECTION SCHEME FOR LINES:A) MAIN- I NON-SWITCHED DISTANCE PROTECTION [FOR 220 kV LINES]:

The scheme shall:-

i) be numerical & modular in construction. Relay shall have continuousself monitoring & diagnostic feature.

ii) have high speed non-switched distance relays for three phase systemsto clear all type of line faults within the set reach of the relay.

iii) It should cover at least line sections completely with 20% in handmargin.

iv) Measure all type of faults without the need to switch the measuringelements to the faulty phase or phases. Zone switching to extend thereach of the measuring elements is not allowed. The reach of each zoneshall be independently & individually adjustable and shall have setting insteps of 1%. Memory circuits with defined characteristics shall be

provided in all three phases to ensure correct operation during close-up3 phase faults and other adverse conditions.

v) have a max. operating time up-to trip impulse to circuit breaker (complete protection time including applicable carrier & trip relay time)under source to line impedance ratios (SIR) under all possiblecombinations of fault with PT being used on the line (with all filtersincluded) at 50% of zone-1 reach :for SIR 0.01-4:as 40 ms at nearest end & 60 ms at other end of line.for SIR 4-15 :as 45 ms at nearest end & 65 ms at other end of line.(carrier transmission time is taken as 20 ms provided that any reductionin carrier time shall be directly reflected as reduction in maximumoperating time).

vi) have stepped time-distance characteristics and shall have at least four independently variable time graded distance protection zones to cover two adjacent line sections out of which Zone-1, 2 & 3 should beselectable in forward direction and Zone-4 should be selectable inreverse direction.

vii) The relay shall have mho or quadrilateral or other suitably shapedcharacteristics for zone-1, 2, 3 & 4. The relay shall have an adjustablecharacteristics angle setting range of 30 - 85 degree or shall haveindependent resistance(R) & reactance(X) setting.

viii) ensure that this long coverage is consistent with limitations imposed byheavy loading and sound phase component of fault current. If thecharacteristics of starting relays are such that it cannot pick-up becauseof very low in-feed, under-voltage relays may also be used assupplementary relays.

ix) have two independent continuously variable time setting range of 0-3seconds for zone-2 and 0-5 seconds for zone-3 & 4.

x) have a maximum resetting time of less than 35milli-seconds.xi) have facilities for offset features with adjustable 10-20% of Zone-3

setting.xii) have residual compensation variable from 30-150%.

xiii) operate instantaneously when circuit breaker is closed to zero-volt 3-phase fault i.e SOTF (Switch On To Fault).

xiv) be suitable for single & three phase tripping.



xv) have a continuous current rating of two times of rated current. Thevoltage circuit shall be capable of operation at 1.2 times rated voltage.The relay shall also be capable of carrying a high short time current of 80 times rated current without damage for a period of 1 sec.

xvi) be selective between internal and external faults.xvii) have adequate contacts to meet the complete scheme requirements & if

required incorporate three separate high speed self reset trip relays for single phase faults and a fourth high speed trip relay for multi-phasefaults.

xviii) have suitable number of potential free contacts. Multiplication relays, if required, shall be provided for Carrier aided features, Auto reclosing,Event Logger, Disturbance recorder & Data acquisition system.

xix) include power swing blocking protection which shall a1) be of triple pole typea2) have suitable setting range to encircle the distance protection described

above.a3) have a continuously adjustable time delay on pick up of setting range

0-2seconds.a4) block tripping during power swing conditions.a5) be of numerical typexx) include fuse failure protection which shall a1) monitor all the three fuses of PTs/CVTs and associated cable against

open circuit.a2) inhibit trip circuits on operation and initiate annunciation.a3) remain inoperative for system earth faults.a4) be of numerical type.xxi) be wired for carrier inter-tripping (PUR/POR) & carrier blocking features

selectable at site.

xxii) be suitable for 1 Amp. rated CT secondary, 110V (phase to phase ) VTsupply and 220 V DC supply. Mode of conversation of DC supply from220 V DC to the voltage level required for their scheme may bementioned in detail. Requirement of CTs & VTs for the satisfactoryworking of the scheme may also be indicated in the tender.

xxiii) The relay shall be suitable for series compensated line and must have acurrent reversal guard feature.

xxiv) The Scheme shall have in-built features of broken conductor detection,distance to fault locator, disturbance recorder and event logger.For disturbance recorder and event logger features, it shall have 8analog and 32 digital channels (out of which at least 16 shall be external

digital inputs). It shall have its own time generator and the clock of thetime generator shall be such that the drift is limited to +0.5 seconds/day,if allowed to run without synchronization. Further, it shall have facility tosynchronize its time generator from Time Synchronization Equipmenthaving output of following types.

Voltage signal: (0-5V continuously settable, with 50m Sec. minimumpulse duration)

Potential free contact (Minimum pulse duration of 50 m Sec.)

IRIG-B

RS232C

The recorder shall give alarm in case of absence of synchronizing pulsewithin specified time.

a) The disturbance recorder shall meet the following requirements:



The frequency response shall be 5 Hz on lower side and 250 Hz or better on upper side.

Scan rate shall be 1000 Hz/Channel or better.

Pre –fault time shall not be less than 100 milliseconds and the post faulttime shall not be less than 2 seconds (adjustable). If another systemdisturbance occurs during one post-fault run time, the recorder shall

also be able to record the same. However, the total memory of acquisition unit shall not be less than 5.0 seconds.b) The event logger shall meet the following requirements:

The time resolution shall be 1 milli second.

Cope with up to 40 changes in any one 10 milli seconds interval.

The date and time should be printed to the nearest 1 milli secondfollowed by a message describing the point which has operated.

Events occurring whilst a previous event is in process of being printedare to be stored to await printing. Over 100 such events must be stored.

c) The distance to fault locator shall meet the following requirements:

Be On-Line type and suitable for breaker operating time of 2 cycles.

The display shall be directly in percent of line length or kilometerswithout requiring any further calculations.

Shall have an accuracy of 3% or better for the typical conditions definedfor operating timings measurement of distance relays. The aboveaccuracy should not be impaired by presence of remote end infeed,predominant D.C. component in fault current, high fault arc resistance,severe CVT transients.

Shall have parallel line mutual zero sequence compensation feature.xxv) FEEDER OVER LOAD ALARM PROTECTION:- A single pole over

current relay for the purpose of monitoring the load flow on feeders tosound an alarm whenever load flow in the line exceeds the setting for agiven period of time to draw the operator's attention. The relay shallhave CONTINUOUS VARIABLE setting range of 50-200% of 1 Amp.and shall be supplemented by a continuously variable timer of 1 to 10seconds.

xxvi) AUTO RECLOSING SCHEME:-a) The protective scheme shall incorporate the necessary equipment to

impart auto-reclosing impulse to the circuit breaker when it has trippedeither due to the operation of the line protection scheme in the first zoneor the accelerated operation of it with the help of carrier equipment. Noauto-reclosing impulse shall be transmitted in the event of a fault

cleared by the 2nd

, 3rd

& 4th

zone of line protection scheme. Auto-reclosing will also be blocked in case the circuit breaker is trippedmanually.

b) The provision of single & three phase auto-reclosing is to be made on220 kV feeders.

c) The reclosing scheme shall automatically reset after any successfulreclosure and shall lock out in case the circuit breaker trips immediatelyafter reclosure. Also the (reclosing) scheme shall not initiate reclosingupon an unsuccessful attempt to manually close circuit breaker.

d) There shall be clear target indications for successful & un-successfuloperation.

e) The auto-reclosing scheme shall have continuously variable dead timesetting range of 0.1-2secs for single phase reclosing as well as for three



phase reclosing. The scheme shall have continuously variable reclaimtime setting range of 5-300secs.

xxvii) CHECK SYNCHRONIZING & DEAD LINE CHARGING SCHEME:-a) Check synchronizing relay and dead line charging equipment shall be

provided for 220 kV feeder to compare the phase angle & frequency of the `incoming' and `running' supplies and allow the auto-reclose to takeplace only if the said parameters are within the permissible limits. Thedead line charging equipment shall ensure auto-reclosing a circuitbreaker on to a `dead' line leaving the checking of synchronism of twosupplies to the other end of it.

b) Synchronizing check relay shall permit breakers to close after checkingthe requirements of synchronizing of incoming and running supply. Thephase angle setting shall not exceed 35 degree and have voltagedifference setting not exceeding 10%. This relay shall have a responsetime of less than 200 milliseconds when the two system conditions aremet within preset limits and with the timer disconnected. The relay shallhave a continuously adjustable time setting range of 0.5-3secs.

Note:- The Feeder over Load Alarm, Auto reclosing scheme, CheckSynchronizing & Dead Line Charging Scheme shall be in-built withnumerical distance protection relay with the above mentionedspecification requirement.

B) NON-SWITCHED DISTANCE PROTECTION SCHEME [FOR 132kV & 66kVLINES]:

The main protection scheme for these lines will be distance scheme working ondefinite distance measuring principle both for phase & earth faults. The schemeshall:-i) be numerical & modular in construction. Relay shall have continuous

self monitoring & diagnostic feature.ii) have high speed non-switched distance relays for three phase systems

to clear all type of line faults within the set reach of the relay.iii) It should cover at least line sections completely with 20% in hand

margin.iv) measure all type of faults without the need to switch the measuring

elements to the faulty phase or phases. Zone switching to extend thereach of the measuring elements is not allowed. The reach of eachzone shall be independently & individually adjustable and shall havesetting in steps of 1%. Memory circuits with defined characteristics shallbe provided in all three phases to ensure correct operation duringclose-up 3 phase faults and other adverse conditions.

v) have a max. operating time up-to trip impulse to circuit breaker (complete protection time including trip relay time) under source to lineimpedance ratios (SIR) :0.01-4 as 50ms under all possible combinationsof fault at 50% of zone-1 reach.

vi) have stepped time-distance characteristics and shall have at least four independently variable time graded distance protection zones to cover two adjacent line sections out of which Zone-1, 2 & 3 should beselectable in forward direction and Zone-4 should be selectable inreverse direction.

vii) The relay shall have mho or quadrilateral or other suitably shapedcharacteristics for zone-1, 2, 3 & 4. The relay shall have an adjustablecharacteristics angle setting range of 30 - 85 degree or shall haveindependent resistance(R) & reactance(X) setting.



viii) ensure that this long coverage is consistent with limitations imposed byheavy loading and sound phase component of fault current. If thecharacteristics of starting relays are such that it cannot pick-up becauseof very low in-feed, under-voltage relays may also be used assupplementary relays.

ix) have two independent continuously variable time setting range of 0-3seconds for zone-2 and 0-5 seconds for zone-3 & 4.

x) have a maximum resetting time of less than 55milli-seconds (includingthe resetting time of trip relays).

xi) have facilities for offset features with adjustable 10-20% of Zone-3setting.

xii) For correct measurement of earth faults necessary equipment for residual compensation shall be included. It shall have residualcompensation variable from 30-150%.

xiii) operate instantaneously when circuit breaker is closed to zero-volt 3phase fault.

xiv) be suitable for three phase tripping.

xv) have a continuous current rating of two times of rated current. Thevoltage circuit shall be capable of operation at 1.2 times rated voltage.The relay shall also be capable of carrying a high short time current of 80 times rated current without damage for a period of 1 sec.

xvi) have adequate contacts to meet the complete scheme requirements & if required incorporate separate high speed self reset trip relays.

xvii) have suitable number of potential free contacts. Multiplication relays, if required, shall be provided for Event Logger, Disturbance recorder &Data acquisition system.

xviii) include power swing blocking protection which shall a1) be of triple pole type

a2) have suitable setting range to encircle the distance protection describedabove.

a3) have a continuously adjustable time delay on pick up of setting range0-2seconds.

a4) block tripping during power swing conditions.a5) be of numerical typexix) include fuse failure protection which shalla1) monitor all the three fuses of PTs/CVTs and associated cable against

open circuit.a2) inhibit trip circuits on operation and initiate annunciation.a3) remain inoperative for system earth faults.

a4) be of numerical type.xx) be suitable for 1 Amp. rated CT secondary, 110V (phase to phase ) VT

supply and 220 V DC supply. Mode of conversion of DC supply from220V DC to the voltage level required for their scheme may bementioned in detail. Requirement of CTs & VTs for the satisfactoryworking of the scheme may also be indicated in the tender.

xxi) The Scheme shall have in-built features of broken conductor detection,distance to fault locator, disturbance recorder and event logger.

5.1.3 SOFTWARE:One licensed copy of software with each type of relay at each S/Stn. of HVPNL

where relays has to be supplied / installed with two licensed copy of softwarefor each type of relay to Design office of HVPNL shall be supplied.



6.0 TESTS :6.1 TYPE TESTS :

The equipment offered should be type tested. Type test report of similar equipment should not be more than seven years old, reckoned from the dateof bid opening, in respect of the following tests, carried out in accordance withISS-3231(1965)/equivalent IEC from Govt./ Govt. approved test house & shallbe submitted along with bid:a) Insulation tests as per IEC 60255-5 & IEC 60255-13.b) High frequency disturbance test as per IEC 60255-22-1 with its latest

amendments (applicable for Numerical relays)c) Fast transient test as per IEC 1000-4, Level-III (not applicable for

electromechanical relays)d) Relay characteristics, performance and accuracy test as per IEC

60255.

e) Tests for thermal and mechanical requirements as per IEC 60255-6

f) Tests for rated burden as per IEC 60255-6g) Contact performance test as per IEC 60255-23 & IEC 60255-13.h) Conformance tests as per IEC 61850.

The above tests shall be supplied as per the applicability of the relaysalongwith bid. The remaining type test reports of above relays shall besubmitted by the successful bidder within three months of placement of order.These type test reports will also be from Govt./ Govt. approved test house &should not be more than seven years old, reckoned from the date of placement of order. The failure to do so will be considered as a breach of contract.

6.2 ROUTINE TESTS:

6.2.1 All equipment shall be subject to routine tests according to the relevantstandards and to such other tests as may be required to ensure that allequipment is satisfactory and in accordance with this specification. ThePurchaser reserves the right to witness all the tests, unless dispensed with inwriting by the Purchaser.

6.3 ACCEPTANCE TESTS: 6.3.1 The Supplier shall give sufficient advance intimation (at least 15 days notice

for Indian Supplier and 30 days notice for Foreign Supplier) to the Purchaser to enable him to depute his representative for witnessing the tests.

7.0 DOCUMENTATION :7.1 All drawings shall conform to international standards organization (ISO) `A'

series of drawing sheet/Indian Standards Specification IS:11065. All drawingsshall be in ink and suitable for microfilming / digitization / scanning, etc for archive purposes. If drawings are computerized than all drawings shall benicely printed. All dimensions and data shall be in S.I.Units.

7.2 The successful Supplier shall submit one complete master set of instruction manual/Literature of Relays alongwith four copies of sampleconnection diagram for all the Circuits/Items with in a week of placement of order to the Design Directorate for checking and approval.

The Purchaser shall communicate his comments/approval on the drawings tothe Supplier within two weeks of the date of receipt of above drawings. TheSupplier shall, if necessary, modify the drawings and resubmit four copies of



the modified drawings for Purchaser's approval within two weeks from thedate of Purchaser's comments. After receipt of Purchaser's approval, theSupplier shall submit 10 prints of final G.A. and schematic drawings for eachItem and ten (10) copies of instruction manuals for each Item alongwith Four (4) good quality softcopy (CDs) of the drawings and instruction manuals.Each set of drawings and each set of instruction manuals shall be boundseparately. The final documents shall be supplied before dispatch of equipment otherwise the supply shall not be considered complete.

7.3 The manufacturing of the equipment shall be strictly in accordance withapproved drawings and no deviation shall be permitted without the writtenapproval of the Purchaser. All manufacturing & fabrication work in connectionwith the equipment prior to the approval of the drawings shall be at theSupplier's risk.

7.4 The Supplier shall furnish specified no. of nicely printed and bound volumes of the instruction manuals in English language, prior to the dispatch of theequipment. The instruction manual shall contain step by step instructions for all operational & maintenance requirements and shall include the following

aspects.i) Storage for prolonged duration.ii) Unpacking.iii) Erection.iv) Handling at site.v) Pre commissioning tests.vi) Operating procedures.vii) Maintenance procedure.viii) Precautions to be taken during operation & maintenance work.ix) Catalogue numbers of all the components liable to be replaced.x) Internal wiring diagrams of the relays.

One set of all the approved drawings and instruction manual/Literaturewill be supplied alongwith each Relay otherwise the supply will not beconsidered as complete supply.

7.5 Approval of drawings by Purchaser shall not relieve the Supplier of hisresponsibility and liability for ensuring correctness & correct interpretation of the latest revision of applicable standards, rules & codes of practices. Theequipment shall conform in all respects to high standards of engineering,design, workmanship and latest revisions of relevant standards at the time of ordering.

NOTE:- In case the equipment offered by the Supplier does not meet with the

requirements of technical specification, the offer of the firm shall not beconsidered.



ANNEXURE-A

GUARANTED TECHNICAL PARTICULARS

A) NUMERICAL TRANSFORMER DIFFERENTIAL RELAY.1. Make.2. Type.3. Minimum differential current at which

relay operations.4. Range & steps of bias setting.5. Operating time at twice the relay

setting.6. VA burden of the relay.7. Descriptive leaflet No. submitted.

(i) T/F OVER FLUXING PROTECTION (In-built in Transformer Differential Relay).

1. Make2. Type.3. Rated Voltage (V,AC)

4. Rated DC Voltage.5. Operating principle.6. No. of Normally closed & Normally open

contacts sufficient for schemerequirements (Yes / No).

7. Contacts self/hand reset.8. Burden.9. Setting range.

i) V/Fii) Time for alarm.iii) Time for tripping.

10. Whether inverse time operating

characteristics provided.11. Whether different time multiplier

settings provided.12. Max. operating time of the relay at

i) 1.4 times the rated value of V/F.ii) 1.25 times the rated value of V/F.

13. Reset time.

(ii) T/F OVER LOAD ALARM PROTECTION (In-built in Transformer Differential Relay).

1. Make.2. Type.3. Rated Voltage.

4. Setting Ranges.5. Operating time.6. Setting range continuously variable.

B) NUMERICAL DISTANCE PROTECTION RELAY. 1. Make.2. Type of relay.3. Type of distance measuring elements.4. Details of starting units and their

switching sequence, if applicable.5. Range of settings (in secondary ohms).

for Zone-I, Zone-2 & Zone-3.

6. Operating times:i) First zone timing.ii) Second zone time setting



adjustable between_______secsto ________secs.

iii) Third zone time settingadjustable between_______secsto________secs.

iv) Third zone time settingadjustable between_______secs

to________secs.7, Contacts rating:i) First Zone.ii) Second Zone.iii) Third Zone.Iv) Fourth Zone

8. VA burden:i) Current circuit of the scheme.ii) Potential circuit of the scheme.

9 Is the VA burden at Sr.No.8 above iscontinuous ? (yes/No)

10. Operating time versus ZS/ZL curves

of the distance scheme.11. Descriptive leaflet no. submitted.

(i) CHECK SYNCHRONIZING RELAY(In-built in Distance Protection Relay): 1. Make.2. Type.3. Rating ( V, ac )4. Aux. Voltage ( V, dc )5. Permissible voltage difference (%)6. Permissible phase angle difference (degree)7. Response time of relay (without timer)( m Sec )

(ii) AUTO RECLOSING (In-built in Distance Protection Relay): 1. Make.2. Type.3. Multi shot or single shot.4. Rating (V, dc)5. Suitable for 1 & 3 phase.6. Dead time setting range (Sec.)7. Reclaim time setting range (sec.)8. Four position selector switch provided.9. Alarm contacts provided for `Auto-reclosed',

`Reclosure unsuccessful'.

(iii) Feeder OVER LOAD ALARM PROTECTION (In-built in Distance Protection Relay).

1. Make.2. Type.3. Rated Voltage.4. Setting Ranges.5. Operating time.6. Setting range continuously variable.



ANNEXURE-B

SCHEDULE OF DEVIATIONS FROM THE SPECIFICATION

In the table the Bidder shall set out all deviations clause by clause from the specificationof the equipment offered. The bid shall be deemed to conform to Purchaser's specificationin all respects unless specifically mentioned in this table.

Sr.No. Clause No. Detailed Deviations with justification.------ ---------- --------------------------------------

Trafo Differential & Distance Prot. Relays

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Transcript of Trafo Differential & Distance Prot. Relays