11 & 66 kV cap bank R1 Apr09...bus. 66 kV capacitor bank shall be connected by ACSR conductor...

GETCO/E/TS – 1&6CAP04/R2 Apr09

Sign & Seal of Bidder of 26

GUJARAT ENERGY TRANSMISSION

CORPORATION LTD.

SARADAR PATEL VIDYUT BHAVAN, RACE COURSE, BARODA – 390 007.

TECHNICAL SPECIFICATIONS

FOR

11 kV & 66 kV STATIC SHUNT CAPACITOR BANK




SPECIAL INSTRUCTIONS TO BIDDER Please read following instructions carefully before submitting your bid. 1. All the drawings, i.e. elevation, side view, plan, cross sectional view etc., in

AutoCAD format and manuals in PDF format, for offered item shall be submitted. Also the hard copies as per specification shall be submitted.

2. The bidder shall submit Quality Assurance Plan for manufacturing process

and Field Quality Plan with the technical bid. 3. The bidder shall have to submit all the required type test reports for the

offered item. However, in the event of partial submission or reports older than specified limit, bidder must submit his confirmation for those type test report/s to be submitted in the event of an order, without affecting delivery schedule, before commencement of supply, free of cost. In absence of this confirmation, the evaluation shall be carried out accordingly as non submission of type test reports.

4. The bidder must fill up all the point of GTP for offered item/s. Instead of

indicating “refer drawing, or as per IS/IEC”, the exact value/s must be filled in. 5. All the points other than GTP, which are asked to confirm in technical

specifications must be submitted separately with the bid. 6. The bidder is required to impart training in view of manufacture, assembly,

erection, operation and maintenance for offered item, at his works, to the person/s identified by GETCO, in the event of an order, free of cost. The cost of logistics will be bear by GETCO.

7. Please note that the evaluation will be carried out on the strength of content of

bid only. No further correspondence will be made.

8. The bidder shall bring out all the technical deviation/s only at the specified

annexure.

9. The bidder should indicate manufacturing capacity by submitting latest

updated certificate of a Chartered Engineer (CE).



SECTION – I


GENERAL TECHNICAL REQUIREMENTS

1.1 SCOPE:

The scope covers design, manufacture, testing at the manufacturer’s works, supply and delivery of 11 kV, 1x2.5 MVAr (12.65 kV, 1x3.6 MVAr or 11 kV, 2x2.5 MVAr (12.65 kV, 2x3.6 MVAr) or 66 kV, 1x10 MVAr (76 kV, 1x14.4 MVAr) STATIC SHUNT CAPACITOR bank, as indicated in Schedule – A of respective tender. The scope include basic requirements in respect of capacitor banks with capacitor cell with Internal fuse, mounting racks, supporting structures, Circuit Breaker, Control & Relay panel, CT, NCT, Series Reactors, LAs, Isolators, power cables, control cables & its end terminations, suitable terminal connectors, conductors, foundation bolts and earthing material for all equipments & structures, etc. This section covers specification of Capacitor cell/bank, structures, Series Reactors, etc. The technical specifications for CB, CRP, isolator, insulators, CT/NCT, etc., are attached separately. Equipments offered shall be complete with all parts/material/ accessories necessary for their successful and trouble free operations such parts will be deemed to be within the scope of supply, irrespective of whether they are specifically indicated here in or not. The major equipments for each shunt capacitor banks shall be as per schedule – A of tender.

1.2 STANDARDS:

1.2.1. The shunt capacitor bank and its associated equipments shall conform to the following standards.

Sr. Item Conforming to Indian Standard

No. 1 Capacitor Cell IS:13925:1998 / IEC:60871 2. Series Reactor IS:5553 3. Internal Fuse IS: 593 / IS : 12672 / IEC 871 4. Structural steel IS:2062 5. Hot Dip Galvanising IS:2629, IS:6745 6. Shunt Capacitors NEMA CP.1 - 2000 7. Guide for protection of IEEE STD C37.99 capacitor bank For other equipments applicable standards are indicated in the respective technical specifications.



All IS/IEC shall be read with latest amendments in vogue on the date of technical bid opening. Equipment meeting the requirements of any other authoritative standards which ensure equal or better quality than the standards mentioned above shall also be acceptable. However, in the event of the equipment offered conforming to any other standards, salient points of the standard adopted shall be indicated in the technical bid itself. However, acceptance of any equipment conforming to any other authoritative standard will be purely at the discretion of the GETCO.

It is not the intent to specify herein complete details of design and construction. The equipment offer shall conform to the relevant standards and be of high quality, sturdy, robust and of good design and workmanship complete in all respect and capable to perform continuous and satisfactory operations in the actual service conditions at site and shall have sufficiently long life in service as per statutory requirements.

1.2.2 General Arrangement of capacitor Banks:

a) The capacitor banks shall be of outdoor type suitable for operation in the climatic conditions as given in this specification and mounted on steel racks and structure with suitable insulators, as required, to be supplied by the bidder.

b) The bidder shall furnish details of connections / configuration, layout diagram showing the basic arrangement of complete banks with dimensions.

c) 11 kV capacitor bank shall be connected by power cable from 11 kV bus. 66 kV capacitor bank shall be connected by ACSR conductor jumpers from 66 kV AIS bus.

d) The list of major equipments of each bank are indicated in schedule – A of tender.

1.3 DRAWINGS: 1.3.1 The following drawings illustrating the technical details of this capacitor

bank shall be submitted by each bidder. a) General outlines dimensional drawings of all the equipments with all

technical details giving the net weights, ratings & capacity of equipments and quantity.

b) Detailed sectional views, showing the general constructional and other relevant features of various equipments.

c) Schematic connection diagrams for complete capacitor banks with associated switchgear equipment.

d) All above drawings in soft.

1.3.2 In the event of an order, the successful bidder shall furnish the following drawings, in triplicate, in spiral bound volume, for approval.

a) General dimensional outline drawings showing front and side elevations and plan of Capacitor Units, banks, Circuit Breaker, etc.

b) Foundation drawings for structure of capacitor bank. c) Elevated G.I. support structure drawings. d) Internal arrangement and connections of capacitor unit.



e) Any other relevant drawing required by purchaser. f) Net & shipping weights, quantity of insulating liquid etc.

1.3.3 Drawings, diagrams, instructions and reports shall be identified by descriptive titles indicating their applications to the equipment offered. All dimensions shall be in metric system.

1.3.4 All the drawings of individual equipment shall be marked with all Technical details, Guaranteed Technical Particulars, details of manufacturer etc.

1.3.5 On approval of all drawings one set of drawings shall be sent to each sub-station where the bank is to be installed & one set each to the concerned Division & Circle office shall also be provided. All Approved drawings in AutoCAD format shall be submitted to Corporate Office.

1.4 GENERAL DESIGN: 1.4.1 DESIGN CRITERIA REQUIREMENTS AND CONSTRUCTIONAL

DETAILS OF CAPACITOR: (i) Each bank shall be made of 3 phase two groups of star connected

(double star) banks. Each star connected bank shall be unearthed, with a floating neutral, but interconnected by a Neutral Protective Current Transformer (NCT) of suitable ratio, to operate protective relays. The NCT secondary current shall be 1A and its ratio decided by design to meet with the protection requirements specified. Series reactors shall be provided on neutral side.

(ii) The protective scheme shall be either by two step current relay

arranged as follows:

If the failure of one or more units causes an over voltage of less than 10% tolerable on the other remaining healthy units, then the unbalance current shall cause in the first step to sound an alarm. But if more than the above numbers of units fail causing a voltage rise of more than 10% then the unbalance current shall cause to trip and isolate the capacitor bank instantaneously.

(iii) The per phase and individual star group rating shall be built up by series parallel combination of individual units so as to achieve the desired rating of the bank. The individual capacity ratings shall be as per IS: 13925.

(iv) All parallel units in one series group shall preferably be arranged in different tiers, that is, one series group shall be duly insulated from one another by post insulators adequate to withstand the voltage that may be impressed and shall be sufficient to withstand even in case of total failure of all the parallel units in a series group. The complete assembly shall also be duly insulated from the earth potential by supporting post insulators.

(v) Although the tolerances in the output rating of each individual unit shall be as per IS: 13925 yet it shall be ensured that in a completely assembled bank, the departures from the nominal rating and within the specified tolerances values shall not cause nuisance alarm or tripping since such alarm or tripping shall be to meet only with the protective requirements specified.



(vi) The tolerances in the output ratings shall not cause departures in the line currents by that value specified in IS: 13925. Besides it shall also be ensured that these unsymmetrical currents shall not cause unsymmetrical voltage rises, whether for short periods or during prolonged operation.

(vii Individual units shall be designed to meet with the requirements of the permissible overloads as specified as per IS: 13925. Each unit shall also be provided with internal discharge devices complying with the requirements of the IS: 13925 part-I.

(viii) The rated voltage of the NCT shall be 12 kV and 72.5 kV, taking in to consideration the voltage impressed on the NCT due to:

a) Voltage due to failure of one or more parallel units in a series bank. b) Voltage impressed on the NCT when all the parallel units in one series

bank fail simultaneously. The bidders shall furnish design calculations along with the bid.

1.4.2 Capacitor Units:

1.4.2.1 A number of capacitor units grouped in series parallel combination

make a Capacitor Bank suitable for 3 phase double star connected

operations and outdoor installations.

1.4.2.2 Each capacitor unit shall have scaled sheet steel container with suitable

mounting bracket which can easily be fixed to frame structures. The

container shall be built from heavy gauge Stainless Steel, 1.6 mm thick

sheet steel with welded seams, mechanically strong, rigid and

hermetically sealed. The container of capacitor Unit shall be designed

to allow for expansion and contraction due to all ambient & loading

conditions expected during the life of the unit.

1.4.2.3 The capacitor elements shall be thoroughly dried and impregnated with

an impregnant that has been completely refined so as not to leave any gas or impurities which may cause deterioration of the dielectric. The impregnant used shall have low viscosity and high chemical stability. It should be non-PCB (NPCB). It shall be incombustible and have a high dielectric constant. Capacitor dielectric shall be 100% polypropylene. However, in case of 100% polypropylene capacitor the polypropylene shall be hazy and aluminum foil should be embossed for proper impregnation. The Characteristics of the oil used for impregnation shall be furnished in the bid. The total thickness of dielectric (excluding aluminum foil) should be clearly indicated in the bid. The nos of layers of dielectric shall be three of more. The details of aluminum foil shall also be furnished. The impregnation shall be carried out under high vacuum & unit shall be totally sealed.

The raw material to be used for manufacturing of capacitor unit i.e. polypropylene film, non PCB non toxic oil and aluminum foil shall be of best quality. List of raw material sources shall be submitted with technical bid.



1.4.2.4 Each unit shall have two bushing for terminal connection. The rating of bushing should not be less than 15 kV, suitable for series / parallel connection with other units to form capacitor bank at 50 Hz. The bushing shall be of porcelain suitable for heavily polluted atmosphere having required creepage distance not less than 375 mm.

1.4.2.5 The capacitor shall have low value of loss which shall not exceed 0.2 watt per KVAR. The loss value of discharge device/resistor and capacitor unit shall be indicated in GTP. The tan delta characteristics of the capacitor unit shall be furnished. The losses in watts for each capacitor unit including losses in fuses and discharge resistors forming integral part of the capacitors along with losses for series reactor shall be guaranteed. If these figures of capacitor losses exceed 0.2W/KVAR, the capacitors will be liable for rejection. Total losses shall be complied as below:

6 x(W x n + losses in series reactor)

Where, n is number of capacitor units per phase of star connection and W is the total loss in a capacitor unit.

The loss temperature characteristics, capacity temperature characteristics and insulation resistance temperature characteristics shall also be furnished. The use of P.C.B. as dielectric for capacitor shall not be acceptable. The dielectric medium to be used shall be non-poisonous and non-toxic in nature and shall not cause pollution of environment.

1.4.2.6 The rating of capacitor cell for respective bank shall be as follow: Sr. No.

Particulars 11 kV 1 x 3.6 MVAr bank

11 kV 2 x 3.6 MVAr bank

66 kV 1 x 14.4 MVAr bank

1 Rated voltage, V 7300 7300 7300 2 Rated kVAr 200 200 200 3 Rated current, A 27.4 27.4 27.4 4 Capacitance in nF 11.94 11.94 11.94 5 BIL, kVrms/kVp 38 / 95 38/95 38/95

1.4.3 Protective Fuses: 1.4.3.1 The capacitor units shall be provided with internal fuses.

Wherever specified, for the protection of each capacitor unit suitable explosion type internally mounted fuses of adequate rupturing capacity shall be provided. It shall conform to IS-9402: 1980. The characteristics of the fuse should be such that it shall isolate the faulty unit only, and protect it against mechanical destruction due to internal failure. The fuses shall not melt or deteriorate when subjected to inrush currents which occur during the life of the bank. The fuses shall not make any healthy capacitor element out of circuit, either in course of isolating the faulty element or due to any external fault, which should be taken care of by the other protective gears earlier to operation of fuses. The selection of fuse to be done in such a manner that characteristic of fuse shall match suitably with over current withstand



characteristic of associated capacitor unit. The fuses shall be of adequate thermal capacity to cater for the increased heating which may occur due to harmonics and capacitor current fluctuations. Fuses shall be capable of disconnecting the faulty element over a wide range of unit terminal voltages from 70 to 150%. In case of all the elements in the same row are fused out in cascade in an internal fuse unit then the fuse element blown out shall be capable of successful disconnection with a voltage of not less than 100% rated voltage appearing across its terminals.

1.4.3.2 The capacitor units shall be so arranged in the bank as to avoid bird faults, by providing adequate clearance between the body of the capacitor unit, of one phase, and the line terminal or the common bus for the units of the adjacent other phases. Necessary bird guards at required locations and insulating sleeve on conductor shall be provided. The units shall be so arranged that uniform temperature of complete bank is maintained when installed in open yard.

1.4.3.3 In case of protection by internal fuses, each unit shall be provided with fuses for each of its element, so that the faulty element within the unit is automatically out of circuit. The operation of the bank shall not be disturbed (except change in capacity within the unit) in any way by switching out of the faulty element.

1.4.4 Permissible Overload :

(i) Voltage : The maximum rms voltage that may safely be applied to the capacitor, rated for continuous duty, shall not exceed the rated rms voltage of the capacitor by more than 10%, and its peak or crest value shall not exceed the same rms voltage by more than 56%.

(ii) Current : The capacitor unit shall be suitable for continuous operating at rms line current not exceeding 30 percent over the current which would flow through capacitors at + 10% rated voltage and + 1% to - 5% rated frequency. (50 HZ).

1.4.5 Each capacitor unit shall contain a directly connected internal

discharge resistors, which shall be capable of reducing the residual voltage from crest value of the rated voltage to 50 volts or less within 5 minutes after the capacitor is disconnected from the source of supply. Time of quick switching on & off shall be specified. During quick switching on and off, the discharge device shall reduce the residual voltage to 10% or less of the rated voltage between switching on and switching off operations.

1.4.6 STRUCTURES: Each capacitor unit shall be mounted so that it can be easily removed

from the racks and replaced without removing other units, de-assembling any portion of the rack. The capacitor units are to be assembled on open type hot dip galvanized structures to form a capacitor bank. The racks shall be supplied suitable for assembly at site in tier formation one above the other and occupy minimum space



and height. The mounting racks shall be hot dip galvanised steel sections, not below 40 x 40 x 5 mm size. Each end of the rack shall have provision to receive incoming line connection. The racks shall be complete with rack insulators, foundation bolts or any other hardware etc. for assembly into complete bank. The height of the racks of capacitor banks shall be such that for making electrical connections with other equipment proper electrical clearances are maintained. The capacitor bank along with its mounting racks and series reactor and null CT shall be suitable for installation on the plinth and the enclosure shall be suitably fenced and interlocked as per safety requirements. The weight of structure, mass of zinc coating shall be indicated in GTP. Minimum mass of zinc shall be 610 gm/m2.

1.5 Circuit Breakers, Control & Relay panel, isolators, insulators, instrument transformer, NCT, LAs, structures etc:

1.5.1 The circuit breaker shall be outdoor type and shall be as per technical

specification attached with the respective tender. The 66 kV CB shall be SF6 type and the 11 kV CB shall be vacuum type. Both CBs shall be suitable for capacitor duties.

1.5.2 11 & 66 kV C&R panel shall be as per technical specification attached with the respective tender.

1.5.3 66 kV outdoor isolators shall be as per technical specification attached with the respective tender. 11 kV outdoor isolator shall be three phase double break out door type as per clause no. 2.3.6.2.

1.5.4 66 kV solid core insulators shall be as per technical specification attached with the respective tender.

1.5.5 66 kV outdoor current transformers shall be as per technical specification attached with the respective tender. For 11 kV outdoor CTs shall be used as per technical specification attached with the tender.

1.5.6 66 kV outdoor NCT shall be as per technical specification attached with the tender. 11 kV NCT shall be as per clause no. 2.3.4.

1.5.7 11 kV station type lightning arresters with suitable structure shall be supplied. 66 kV lightning arresters with structure shall be as per technical specification attached with the respective tender.

1.6 SERIES REACTORS:

The series reactor of small size is required to limit the inrush current during switching operation & suppress the harmonic currents. The series reactor shall be aluminum wound, outdoor type, 50Hz, air cored, non magnetically shielded or air cooled type and suitable for operation in climatic conditions specified, conforms to IS:5553 (as amended up to date). The reactor shall be natural air cooled coreless type with one bushing each on incoming and outgoing side. The voltage rating of the series reactor’s base insulator shall be nominal system voltage. Series reactors shall be capable of withstanding the specified short circuit currents.



The percentage series reactance shall be 0.2% for both 11 & 66 kV bank. However, series reactor with 6% reactance shall be provided for urban substation. The bidder shall furnish calculations justifying the value selected. The series reactors shall confirm to type tests and shall be subjected to routine tests as per IS: 5553.

1.7 ACCESSORIES: A portable discharge device complete with clamps sticks cable

shall be provided with each capacitor bank for discharging the capacitors manually whenever necessary. The device shall be properly insulated. A printed booklet giving the safe working instructions and safety measures along with maintenance schedule and procedure to be followed shall be supplied.

1.8 TERMINAL CONNECTORS AND EARTHING TERMINALS:

The various outdoor equipments shall be supplied with bi-metallic compression type terminal connectors having STC rating of 25 kA for 3 sec, suitable for ACSR ‘Dog’ conductor in case of 11 kV

banks and ACSR ‘Panther’ conductor in case of 66 kV banks. The thickness of terminal connectors at any position shall not be less than 12 mm. Each equipment shall be supplied with at least TWO nos of grounding terminals and clamps for receiving ground connections.

1.9 TESTS :

a) Type Tests: The following type test reports shall be submitted with the

technical bid from NABL accredited laboratory not older than 5 years and valid till expiry of validity of offer.

The capacitor Cells, Series reactor, structure, etc. shall be subject to the

various type routine and acceptance tests as per relevant IS or IEC Publication (amended up-to-date). The capacitor offered must have been also endurance tested as per IEC: 871-2/IS: 13925 and capacitor under the package shall also be type tested as per relevant IS/IEC.

The copies of these type test reports should be submitted along with offer. 1. Capacitor Unit:

The following type test reports shall be submitted with technical bid for an offered unit. i) Thermal stability test ii) Capacitor loss tangent (Tan Delta) measurement at elevated

temperature. iii) AC voltage test between terminals & container. iv) Lightning Impulse Voltage test between terminals & container. v) Short Circuit Discharge test. vi) Endurance test as per IEC: 871-2/IS:13925



vii) Sealing test: The test shall be carried out at 70 + 5ºC for a period of 12 hours.

2. Series Reactor: a) Temp. Rise at rated continuous current Test b) Short circuit Test c) Impulse voltage withstand test.

a) Measurement of winding resistance b) Measurement of Impedance c) Measurement of Load losses d) Separate source withstand test e) Inter turn O/V. f) Measurement of IR value

3. 11 kV Isolators:

(a) For 11 KV isolators and Isolator-cum-Earth Switches following type test reports shall be submitted. (1) Lighting impulse voltage withstands Test. (2) Temperature Rise Test. (3) Rated peak withstands current and rated short time

withstand current test. (4) Mechanical endurance test. (5) Power freq voltage (dry & wet) withstand test.

(b) For Insulators only: (1) Lightning impulse voltage withstand test. (2) 50% impulse voltage flashover test. (3) PF voltage withstand test ( Dry ) (4) PF voltage withstand test ( Wet ) (5) PF voltage flashover test ( Dry ) (6) PF voltage flashover test ( Wet ) (7) Visible discharge test (8) Porosity test (9) Mechanical strength test. (10) Visual test. (11) Dimensional test.

4) Other equipments: Reports of all type tests as stipulated in respective technical specification or

as per applicable standards for all other associated equipments offered shall

be invariably submitted with technical bid. b) Routine & Acceptance Tests:

The equipment shall comply with all routine and acceptance tests. Routine and acceptance tests as per relevant IS shall be carried out on each equipment in presence of GETCO representative, at manufacturer's works only. All test reports should be submitted before dispatch of the equipment.

1. Capacitor Unit:



Following tests in line with IS-13925 shall be performed during acceptance. Sampling will be done as per Appendix E, IS-13925. i) Visual examination ii) Measurement of Capacitance iii) Voltage test between terminals. Test between line terminals and container: This test shall be carried out

as routine test as per Clause No.16.2 of IS:13925 except that the duration of the test shall be 1-minute instead of 10 seconds.

iv) AC Voltage test between terminals & containers. v) Test of Discharge device vi) Capacitor loss tangent measurement vii) Sealing test: The test shall be carried out at 70 + 5ºC for a period of 12

hours.

2. Series Reactor a) Measurement of winding resistance b) Measurement of Impedance c) Measurement of Load losses d) Measurement of separate source withstand e) Inter turn O/V or Imp. f) Measurement of IR value

3. Structures: As per IS for steel and hot dip galvanising 4. Isolator:

All routine/acceptance tests shall be carried out on each Isolator and Isolator-cum-Earthing Switch and on insulators, as per technical specification and applicable standards, in the presence of GETCO representative.

5. Other equipments:

All routine/acceptance tests as stipulated in respective technical specification for all other equipments offered shall be carried out and report is submitted for approval before dispatch.

1.10 FOUNDATION :

1.10.1 The detailed foundation drawings showing complete particulars as

required for casting foundation for normal soil, for Capacitor Bank &

associated equipments shall be furnished by the successful bidders

along with the drawings. No deviation to this clause is permitted.

1.11 GUARANTEED TECHNICAL PARTICULARS:

The bidders shall furnish along with the bid complete guaranteed

technical particulars as called for in Schedule-A1 to A-III Section-III of

this Specification. Particulars which are subject to guarantee shall be

clearly marked. Bids lacking information in this respect shall not be

considered.

1.12 INSTRUCTION MANUALS:



Operation and Maintenance manuals for equipments and capacitor bank shall be submitted with technical bid and in the event of an order for approval with drawings. Also, copies shall be submitted along with dispatch to each consignee.

The manuals shall be spiral bound and shall contain all the printed

drawings, requisite information for erection, operation and maintenance

of the equipment. The manuals shall include all the required

details/drawings, along with the following particulars:

a) Marked erection prints identifying the component parts of the

equipment as dispatched with assembly drawings.

b) Detailed dimensions, assembly and description of all the

components and catalogues for operation of Capacitor Units and

switchgear equipment.

c) Complete list of spare parts.

d) Reduced drawings of all schematic control and wiring as finally

approved.

e) Complete details of tools tackles & their use and

f) Detailed foundation, erection etc. drawings for VCB & SF-6

Breaker & its associated parts & equipments.

1.13 EVALUATION OF LOSSES:

1.13.1 The losses of capacitor sells for the purpose of evaluation of bids shall

be loaded at the rate of Rs.60,198 per K.W. loss. Any wrong/misleading

information in this regard will result into outright rejection of the bid or

termination of contract at any time, fully at the risk and cost of the

supplier.

1.13.2 The losses in kilowatts at rated voltages and rated frequency shall be

guaranteed under penalty for each capacitor unit and series reactor. For

the purpose of penalty computations, the test figures of losses carried

out at 3rd party Govt. testing laboratory or measurement of losses during

acceptance tests, whichever is higher will be compared with the

corresponding guaranteed figures.

1.13.3 The penalties shall be separately evaluated from the excess of the test

figure of losses in kilowatt, over the corresponding guaranteed value.

No tolerance shall be permitted over the test figures of the losses.

1.13.4 The penalties shall be calculated for excess of losses at the rate of

Rs.60,198/- per K.W. For the fraction of kilowatt, the penalties shall be

applied prorata. If the test figure of losses is less than the guaranteed

values, no bonus will be allowed. The bidders should note that values

assigned for loading of losses, are based on the present worth factor and,

therefore, capitalization of investment shall not be made separately.

1.13.5 Tolerance : Since Indian Standard IS:13925 or IEF Publication No.70

and IS:5553 (Part-II) or IEC publication No.289 allow certain tolerance

for the acceptance of losses for capacitors and series reactors



respectively the bidders are requested to indicate whether the figures

given for the guaranteed losses in Schedule of Guaranteed Technical

particulars are with or without such tolerance. If the tolerances are

applicable, the limit for the same should be indicated. In absence of any

information to this effect, the figures for losses will be increased by 10%

in case of shunt capacitors and 15% in case of series reactor. Any

change in the figures assigned for the losses will not be permitted after

opening of the bids. Bid evaluation will be carried out on the basis of

information made available at the time of bid opening.

1.14 ERECTION : The bidder is required to assist the purchaser for erection and

commissioning of Capacitor Units and 11 KV & 66 KV Circuit

Breakers. The successful bidder is required to depute

erection/commissioning engineer at the request of purchase free of cost.

1.15 GUARANTEE :

The bidder shall guarantee the Capacitor Banks and associated

equipments for 36 months from date of commissioning and 42 months

from the dated of supply, whichever is earlier

1.16 INSPECTION OF THE EQUIPMENTS:

1.16.1 The successful bidder shall offer inspection of the equipment complete

in all respects. The equipment shall be offered for inspection with the

elevating structure, clamp connector, bolts and nuts and foundation bolts

etc. No equipment shall be inspected unless offered with above

accessories.

1.16.2 During inspection, certificates of bought out items, which are used in

manufacturing of Capacitor units or equipment should be furnished.

1.16.3 Factory inspection, if required, will be done by the GETCO before

placement of order. The bidder shall give full co-operation to GETCO’s

officers for factory inspection.

1.17 DEVIATION FROM SPECIFICATION: No deviation to this specification is accepted and if any deviation is

found in the offer it will result into rejection of the offer out rightly.

1.18 QUALITY ASSURANCE PLAN:

The Bidder shall invariably furnish following information along with his offer. Information shall be separately given for

individual type of equipment offered.

i) Statement giving list of important raw materials, names of sub-suppliers for the raw material, list of standards according to which the raw material in presence of Bidder’s representative, copies of test certificates.

ii) Information and copies of test certificates as in (i) above in respect of bought out items.



iii) List of manufacturing facilities available. iv) Level of automation achieved and list of areas where

manual processing exists. v) List of areas in manufacturing process, where stage

inspections are normally carried out for quality control and details of such tests and inspections.

vi) Special features provided in the equipment to make it maintenance free.

List of testing equipment available with the Bidder for final testing of equipment specified and test plant limitation, if any, vis-à-vis type, special, acceptance and routine tests specified in

the relevant standards. These limitations shall be very clearly brought out in schedule of deviations from specified test equipments.



SECTION – II


SPECIFIC TECHNICAL REQUIREMENTS

2.1 SCOPE :

2.1.1 This section covers the specific technical particulars, climatic and

Isoceraunic conditions and system particulars suiting with the static

shunt capacitor banks, circuit breakers, series reactors, neutral

current transformer, isolators, and Lightning arresters which shall

be offered as per the "General Technical Requirements" given in

Section-III of this specification and the "Schedule of Requirements"

specified herein.

2.2 CLIMATIC & ISOCERAUNIC CONDITIONS :

2.2.1 The climatic conditions at site under which the equipment shall operate

satisfactorily are as follows :-

a) Maximum ambient temperature of the air in Shade (ºC) 50

b) Minimum ambient temperature of the air in Shade (ºC) 04

c) Maximum daily average ambient temperature (ºC) 40

d) Maximum yearly average ambient temperature (ºC) 35

e) Maximum relative humidity (%) 95

f) Average number of thunder-storm days per annum 15

g) Average annual rainfall (Cm) 115

h) Maximum wind pressure (kg/m2) 150

i) Earthquake acceleration (g) 0.08 X 2

j) Height above mean sea level (m) Not exceeding 1000

2.2.2 The equipment offered shall be suitable for continuous operation at the

full rated capacity under the above conditions.

2.2.3 Since the sub-stations are likely to be near the Sea shore or in an

industrial area, the equipment offered shall be suitable for heavily

polluted atmosphere.



2.3 TYPE AND RATING :

2.3.1 Technical Requirement shunt Capacitor:

The Units along with switch yard equipments & accessories shall comply with

the following technical requirements:

For For

7.3 KV 7.3 KV,

200 KVAR 200 KVAR

Cap. Units Cap. Units

Used for used for 66 kV

11 kV Cap Bank Cap. Bank

(internal fuse) (internal fuse)

a) Nominal system voltage (KV) 11 66

b) Rated voltage for Cap. Bank (KV) 12.65 76

c) Highest system voltage (KV) 12.65 76

d) Design Voltage for other 12 72.5

Associated equipments except

capacitor bank (KV)

f) Capacitance of 59.7 7.94

bank measured between

three line terminals & neutral

at rated frequency (micro farad).

g) Tolerance on rated output. As per IS:13925.

h) Maximum permissible 130% 130%

output (KVAR) of rated output.

i) Type of connection Double Star Double Star

j) Controlling Equipment. Circuit Circuit

Breaker Breaker SF6

Vacuum Type for

type for Cap. duty.

Cap.duty.

k) Fuses The capacitor unit/elements shall be

protected by internal fuses of

adequate rating. The internal

protection fuses shall conform to

respective applicable IS.

l) Accessories The capacitor banks shall be equipped

with complete all accessories mainly

steel mounting racks ( Hot Dip



Galvanized ), bus bars, bus bar

support insulators, connectors, bolts

& nuts, foundation bolts etc.

m) Discharge Device Discharge resistors to discharge within

300 seconds to less than 50 V shall be

provided internal to Capacitor unit.

2.3.1.2 The supplier shall include the means to protect the capacitor bank

against sustained over voltages more than 1.05 P.U. 2.3.2 Core less Series Reactor: sr no

Particulars 11 kV 1 x 3.6 MVAr

11 kV 2 x 3.6 MVAr

66 kV 1 x 14.4 MVAr

a) Rated voltage. BIL

12 kV 28/75 kVp

12 kV 28/75 kVp

72.5 KV 140/350 kVp

b) Type Outdoor, dry type, single phase, air

cooled, Aluminum

wound

Outdoor, dry type, single phase, air

cooled, Aluminum

wound

Outdoor, dry type, single phase, air

cooled, Aluminum

wound e) Rated continuous current (Amps). 164.3 164.3 109.68 f) Rated KVAR. 1.2 1.2 4.8 g) Maximum permissible continuous

current. 130% of rated continuous current of capacitor bank.

h) Temperature rise in : a) Oil (ºC) 40 b) Winding (ºC) 50 i) Rated short time symmetrical

rms. current & time. 16 times of 130% rated current of capacitor bank

for 3 Sec. j) Number of terminal bushing. As required. k) Number of series reactor required

per cap Bank. 6 nos of 1 phase reactor

2.3.3 Clause deleted. 2.3.4 Neutral Current Transformers:

The Technical Requirement for 66 kV NCT shall be as per technical specification of attached separately with the tender. 11 kV NCT shall be single phase, outdoor, oil immersed dead tank type hermetically sealed with following technical parameters.

a) Type Outdoor, ON cooled b) Rated primary voltage. 12 kV c) Ratio 1/1 A

d) Applicable standard IS:2705 e) Rated freq 50 Hz f) No of cores 2 (Metering & Protection) g) Rated out put of each core 15 VA



h) Class of accuracy 0.5 / 5P10 i) PF withstand voltage 28 kV rms j) Impulse withstand voltage 75 kVp k) Over current factor 100 times primary rated current l) ISF not more than 5

2.3.5 Lightning Arresters: 2.3.5.1 The Technical requirement of 66 kV LA shall be as per technical

specification attached separately with the tender.

2.3.5.2 The 11 kV lightning arresters station duty type suitable to meet the following requirements shall also be provided per phase:

Sr No

Particulars 11 KV

a) i) Rated voltage (KV) 12 KV

ii) Energy class. 3 b) i) Rated nominal discharge current (KA) (with 8/10

micro second wave) 10 KA

ii) MCOV (Minimum value) 12 KV iii) Impulse Residual voltage (Max. value) i) at 0.5 x NDC 38 kVp ii) at 2 x NDC 45 kVp iv) Residual voltage at steep current (Max) 45 kVp v) Switching residual voltage (Max) at 2 KA. 35 kVp c) Long duration current impulse test on heavy duty to

10 KA Arrester. As per : 3070-1974

d) Impulse withstand test voltage (KV peak) (with 1.2/50 micro sec. wave)

75 KV

2.3.5.3 The 11 kV arrester offered shall be gapless type & shall meet the

requirement of "IEC" latest Amendment on "Gapless Arresters". Full Technical particulars of gapless arresters should be furnished.

2.3.6 Isolators: 2.3.6.1 The Technical requirement of 66 kV isolator shall be as per

technical specification attached separately with the tender. 2.3.6.2 The 11 kV isolators shall also comply with the following technical

requirements: Sr No

Particulars 11 KV

a) Type Outdoor, manually operated, double break structure mounted.

b) Rated continuous current (Amps) 800 c) Rated short time current (KA) 25 KA, 3 Sec. d) Rated peak withstand current. 62.5 kAp e) Rated Voltage. 12 kV f) BIL 12/30/75 kVp



2.3.6.3 Type tests reports & GTP for 11 kV isolator shall be submitted separately in line with GTP format given for 66 kV isolator.

2.3.7 Control & Relay panels: Each capacitor bank shall be supplied with required

control & relay panel as per technical specification separately with the tender.

2.3.8 All the terminal connectors required for all the equipments

of capacitor bank shall be supplied in line with applicable standard.

2.3.7 EARTHQUAKE & WIND DESIGN LOADS:

Each equipment including its structures if any shall be designed to

withstand repeated earthquake acceleration of 0.8 x 2 g and wind loads

of 100 Kg/m2 on the projected area (non-simultaneous) without damage

to component parts and without impairment of operation.)

2.3.8 AUXILIARY POWER SUPPLY:

Power supply for auxiliaries will be available at 230 volts single phase

and 400 Volts 3-Phase A.C. 50 Hz. The frequency can vary between

90% and 105% and voltage would vary from 110% to 85% of the

normal value. D.C. supply at 220/110 volts D.C. 2 wire will be available

from the station battery. The D.C. supply is subject to variation between

85% and 110% of the normal value.



SECTION - III

BIDDER SCHEDULES

SCHEDULE A/1

GUARANTEED TECHNICAL PARTICULARS FOR CAPACITOR UNITS

(7.3 KV, 200 KVAR ) WITH INTERNAL FUSES

To be filled in, signed and guaranteed by Bidders)

11 KV 66 KV

1) Manufacturer's name.

2) Manufacturer's type & designation.

3) Reference Standard.

4) a) Rated voltage of capacitor cell

b) Service voltage of capacitor cell

5) a) Rated line Current.

i) per cell

ii) per phase

b) kVAr of capacitor cell

6) Rated capacitance in Micro farad of

a) per cell

b) per phase

c) per bank

7) No. and make of bushings & voltage class.

8) Tolerance on rated output.

9) i) Maximum continuous over voltage in % for duration of

a) One hour

b) Two hours

c) Four hours

ii) Maximum continuous over load current in Amp,

10) Rated frequency.



11) No. of phases.

12) No. of such Cap. Bank units in one

Bank.

13) 1 Minute power frequency withstands voltage in kVrms.

a) Between terminals.

b) Between terminals shorted & container

14 Impulse withstand voltage (1.2/50 wave)

between terminals shorted & container(kVp).

15 Type of impregnation.

16 Dielectric Material & Thickness.

17 Foil material & thickness

18 Discharge time

Discharge internal device.

19 Total weight.

20 Overall dimensions and mounting

arrangement with drawing No.

21 Power loss Watts per kVAr of capacitor cell.

a) With resistor.

b) Without resistor.

c) Loss angle (δ)

22 Terminal arrangement.

23 Temperature rise of cell over ambient

24 Maximum capacitor inrush surge with proposed

reactor in Amp.

25 Minimum electrical clearances of bank

i) Phase to Phase

ii) Live part to earth

26 Minimum creepage for bushing

27 Percentage loss of capacitance



at which an internally fused capacitor

unit considered useless

Date : Seal & Signed of Bidder

Place :



BIDDER SCHEDULES

SCHEDULE A/2

GUARANTEED TECHNICAL PARTICULARS FOR 11 & 66 KV CAPACITOR BANKS.

(To be filled in, signed and guaranteed by Bidders)

11 kV 66 kV

1) Manufacturer's name.

2) Manufacturer's type, designation.

3) Reference Standard.

4) MVAr output at rated voltage

5) MVAr output at service voltage

6) Rated voltage.

7) Service Voltage.

8) Rated Frequency.

9) No. of Phases.

10) Insulation level : a) 1-Minute power frequency withstand voltage between terminals shorted and phase/earth.

b) Impulse withstand voltage (1.2/50 wave impulse)

11) Type of connection.

12) Total weight (Cap. Bank and Structure)

13) Overall dimensions and outline arrangement drawing No.

14 Tests: All equipment will be subject to all

routine/acceptance and Type tests.

15 List of Fittings, support structures, bolts, nuts, foundation bolts, clamp and connectors accessories, included.

Date : Seal & Signed of Bidder

Place :



BIDDER SCHEDULES

SCHEDULE A/3

GUARANTEED TECHNICAL PARTICULARS FOR SERIES REACTORS

To be filled in, signed and guaranteed by the Bidders)

11 kV 66 KV

1 Manufacturer's name.

2 Manufacturer's type, designation.

3 Reference Standard.

4 Rated line voltage (KV)

5 No. of phases.

6 Rated frequency.

7 Reactance/Phase (Ohms) Percentage impedance

8 Choke Voltage/Phase (Volts)

9 Rated continuous current.

10 Rated KVAR

11 i) Losses at Rated continuous current at 75ºC (KW)

12 Maximum permissible continuous current.

Over current factor

13 Temperature rises over ambient specified.

14 Basic Insulation Levels : a) Impulse withstand voltage. (1.2/50 Micro Second Wave)

b) 1-Minute Power frequency withstand voltage dry & wet.

15 Rated Short time current. (3 seconds KA (rms)

16 Bushings: Type, make & Test Voltages.

17 Terminal arrangement.

18 Creepage distance of Bushings (mm)

i) Total

ii) Protected.



19 Tests :

a) Series reactor will be subjected to all routine, acceptance and type tests as per I.S.S.

b) Type test report No. enclosed or not?

20 Overall dimensions and general arrangement Drawing No.

21 Total weight.

22 Type of cooling 23 Whether series reactors will be provided with

the following fittings & accessories.

a) Bushings (No. size and ratings)

b) Lifting lugs.

c) Rating & Diagram plate.

d) Earthing terminals.

e) Any other items.

DATE: SIGN: SEAL of bidder

11 & 66 kV cap bank R1 Apr09...bus. 66 kV capacitor bank shall be connected by ACSR conductor...

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Transcript of 11 & 66 kV cap bank R1 Apr09...bus. 66 kV capacitor bank shall be connected by ACSR conductor...