NTPC Limited

(A Government of India Enterprise)

Badarpur Thermal Power Station

NOTICE INVITING TENDER (NIT)

FOR

Procurement of NGT-BTPS

(Domestic Competitive Bidding)

NIT No: 40033007	Date:22.01.2015
Bidding Document No: 300018899

1.0NTPC invites on-line bids from eligible Bidders for aforesaid package, as per the scope of work briefly mentioned hereinafter:

2.0Brief Details

NIT No.	40033007
NIT Date	22.01.2015
Document Sale Commencement Date & Time	22.01.2015 18:09:30
Document Sale Close Date & Time	11.02.2015 16:00:00
Source of IFB/NIT	Badarpur Thermal Power Station
Contract Classification	Equipment Supply
Last Date and Time for Bid submission	10.03.2015 15:00:00
Technical Opening Date & Time	10.03.2015 15:15:00
Bid Opening Date & Time	18.03.2015 15:15:00
Cost of Bidding Documents in INR	1,182.00
EMD in INR	171000.00
Pre-Bid Conference Date & Time (if any)
Last Query Date (if any)	07.03.2015

3.0 Bid Security and Integrity Pact (if applicable) shall be submitted in a sealed envelope separately offline by the stipulated bid submission closing date and time at the address given below. Any bid without an acceptable Bid Security and Integrity Pact (if applicable) shall be treated as non-responsive by the employer and shall not be opened.

4.0 A complete set of Bidding Documents may be downloaded by any interested Bidder on payment (non-refundable) of the cost of the documents as mentioned above in the form of a crossed account Payee demand draft in favour of NTPC Ltd., Payable at NEW DELHI or directly through the payment gateway at our SRM Site (https://etender.ntpclakshya.co.in/sap/bc/gui/sap/its/bbpstart). For logging on to the SRM Site, the bidder would require vendor code and SRM user id and password which can be obtained by submitting a questionnaire available at our SRM site as well as at NTPC tender site (www.ntpctender.com). First time users not allotted any vendor code are required to approach NTPC at least three working days prior to Document Sale Close date alongwith duly filled in questionnare for issue of vendor code and SRM user id/password.

5.0Brief Scope of Work & other specific detail

1. NEUTRAL GROUNDING TRANSFORMER with NGR FOR 6.6 KV UNGROUNED SYSTEM

Technical Specification:

A) System in which neutral grounding transformer to be incorporated:

6.6KV ungrounded system fed from secondary winding of Delta/delta connected power transformer of 12.5MVA or alternatively fed from secondary winding of Star/delta connected power transformers of 25 MVA,25MVA,31.5MVA and 63MVA.

B) Type of grounding envisaged for above system:

"Distribution transformer grounding "using star/delta connected distribution transformer (NGT). Neutral grounding resistance of 0.68ohms will be connected across open delta. Primary circuit diagram is enclosed herewith.

C) Specification of Neutral Grounding transformer (NGT)

a) Primary winding connection :Star neutral solidly grounded b) Secondary winding connection : Open delta

c) Type :Three phase two winding d) i) Line Voltage ratio :6600V/240V,

ii)limb Ratio: (6600/1.73)/240 V

e)Open delta voltage on secondary side : 718.8V (or #3*415V)in case of terminal earth fault on primary side.

f)Rating : 275 KVA continuous. Short time rating of 800 KVA for 5 mins.

g)HV bushing current rating : 85A

h)LV bushing current rating :1060A

i)HV neutral bushing current rating :200A

j)Current transformer on HV (6.6KV) side Neutral for back up E/F protn.

Ratio	: 200/1
Accuracy Class : 5P20
VA	: 15VA
Services		: protection
k) Terminal details for earthling : copper flat suitable for 1060A for five (transformer LV bushing)			minutes
l) Services		: outdoor

1.0GENERAL REQUIREENT

1.1All drawings, schedules and annexure appended to this specification shall form part of the specification and supplement the requirement specified.

1.2The design and workmanship shall be in accordance with the best engineering practices to ensure satisfactory performance throughout the service life.

1.3The equipment offered by the bidder shall be complete in all respects. Any material and component not specifically stated in the specification and which is necessary for trouble free operation of the equipment and accessories specified in this specification should be deemed to be included. Unless specifically excluded all such equipment/accessories shall be supplied without any extra cost.

1.4Design and manufacture shall be such that equipment / accessories of same type and rating are inter-changeable.

1.5It is not the intent to specify completely herein, all aspects of design & construction of equipment. Nevertheless the equipment shall conform in all respect to high standards of engineering design and workmanship and shall be capable of performing in continuous commercial operation in all manners. The engineer shall have a right to reject or accept any work or material, which in this assessment in not complete to meet the requirements of this specification and/or applicable international standards mentioned elsewhere in the specification.

1.6All temperature indicators, Buchholz relays and other auxiliary devices shall be suitable for 220 VDC control supply. All alarm and trip contacts and also be suitable for connection in 220 VDC circuits.

1.7The equipment shall be designed taking into consideration an ambient temp of 50 degree centigrade.

2.0CODES AND STANDARDS:

2.1The design , manufacture and performance of the transformer offered shall in general comply with the latest issue including amendments of the following standards. Rules and acts. In case of conflict between this specification and those (IS codes, Standards etc.) referred to herein, the former shall prevail.

Standard Title International and Internationally

Recognized Standard

IS:5 Colour for ready mix paints

IS:335 New insulating oils, for transformers and Switchgears. BS 148 & IEC 296

IS:375 Marking and arrangement for switchgear bus bars, main connections and Auxiliary Wiring. IS:1886 Codes of practice for installation and maintenance of transformers.

IS:2026 Power Transformers. IEC:76

IS:2099 Bushing of alternating voltage above 1000V IEC: 36A BS:223

IS:2147 Degree of protection provided by enclosures for Low voltage Switchgear and Control Gear. IS:2705 Current Transformer. IEC-185

IS:3347 Dimensions of porcelain transformer bushings for use in normal and lightly polluted atmosphere. IS:3637 Gas operated relays.

IS:1367 Hot Dipped Galvanized Coatings(part-13) IS:3639 Fittings and accessories for power transformers. IS:6209 Methods for PD measurements.

IS:6600 Guide for loading of oil immersed transformer.

IS:10028 Code of practice for selection, installation and maintenance.

IEEE:32 IEEE standard requirement terminology and test procedure for neutral grounding devices. IS:3151 Earting Transformer

NEMA TR 1 NOISE LEVEL CBIP: manual or transformer.

2.2 GENERAL Indian Electricity rules Indian Electricity act

The above can be obtained from

KITAB MAHAL, STATE EMPORIUM, BUILDING BABA KHARAK SINGH MARG, NEW DELHI-110001

2.3Other internationally accepted standards, which ensure equivalent or better performance than those, specified in standards indicated under clause-5.1 shall also be accepted.

2.4Incase equipment conforms to such internationally acceptable standards which ensure equivalent or better than that specified in standards mentioned under clause -5.1 then complete English version of such standards or the relevant extracts of the same shall be forwarded with the bid and the salient features of comparison shall be brought out separately in additional information scheduled of BPS Vol. IA

2.5The transformers to be furnished shall have all accessories to meet the requirement of Indian Electricity act 1910 and Indian Electricity rules 1956 amended up to date. Nothing in this specification shall be constructed to relieve the Vendor of this responsibility.

2.6The Indian standards mentioned above are available from:

Bureau of Indian Standards,

Manak Bhawan,

9, Bahadur Shah Zafar Marg,

New Delhi- 110001 (INDIA)

3.0 GENERAL TECHNICAL REQUIREMENT EQUIPMENT DESCRIPTION

3.1.07BUCHHOLZ REALY

A double float type Buchlolz relay conforming to IS: 3637 shall be provided. All gas evolved in the transformer shall collect in

this relay. The relay shall be provided with attest cock suitable for a flexible pipe connection for checking its operation. A copper tube shall be connected from gas collector to a valve located about 1200 mm above ground level to facilitate sampling with the transformer in service. The device shall be provided with two electrically independent potential free contacts, one for alarm on gas accumulation and the other for tripping on sudden rise of pressure.

3.1.08 TEMPERATURE, INDICATORS

a) OIL TEMP INDICATOR

All transformers shall be provided with a 150mm dial type thermometer for top oil temp indication. The thermometer shall have adjustable electrically independent ungrounded alarm and trip contacts, maximum reading pointer and resetting devices and shall be mounted in the marshalling box. a temperature sensing element suitably located in a pocket in the top oil shall be furnished . This shall be connected to the OTI by means of capillary tubing. Accuracy class of OTI shall be +/- 2 degree centigrade or better. the OTI shall have a full scale deflection of 240 degree centigrade and shall have linear graduation to read every 2 degree centigrade.

b) WINDING TEMPERATUE INDICATOR

A device for measuring the hot spot temp of the winding shall be provided the accuracy class of winding temp. Indicator shall be+/- 2 degree centigrade or better. It shall comprise the following.

1.Temp. Sensing element.

2.Image coil and bushing current transformer.

3.AUX. CT#s. if required to match the image coil , shall be furnished and mounted in the Marshalling box.

4.150mm Local indicating instrument with Maximum reading pointer mounted in Marshalling Box. It shall have two adjustable electrically independent potential free contacts one for winding temperature High alarms and one for trip.

5.Automatic ambient temp compensation.

6.All contact shall be adjustable on a scale and suitable for connection in 220V DC circuit. These shall be accessible on removal of the cover.

7.The WTI shall have full-scale deflection of 240 degree centigrade and shall have linear graduations to read every 2 degree Centigrade.

3.1.09 EARTHING TERMINAL

Two earthing pads suitable for connecting 50*10 mm GI flat shall be provided at position close to the two diagonally opposite bottom corners of tank. These grounding terminals shall be suitable for bolted connection. The earthing terminals shall be cap[able of carrying for four (4) seconds the full lower voltage short circuit current of the transformers.

3.2 CORE

3.2.01 the core shall be constructed from high grade non-ageing, cold rolled grain oriented Silicon steel laminations.

3.2.02 The design of the magnetic circuit shall be such as to avoid static discharge, development of short circuit paths with in itself or to the earthed clamping structure and production of flux component at right angles to the plane of laminations, which may cause local heating

3.2.03 The insulation of core to bolts and core to clamps plates shall be able to withstand a voltage of 2KV RMS for one (1) minute. 32.04 cores and winding shall be capable of withstanding shocks during transport, installation, services and adequate provision shall be made to prevent movement of core and winding relative to tank during this condition.

3.2.05 All steel section used for supporting the core shall be thoroughly sand blasted after cutting, drilling and welding. 3.2.06 Eye and lugs shall be provided for lifting the core.

3.3 WINDING

3.3.01 The conductors shall be electrolytic grade copper free from scale and burrs. 3.3.02 All winding shall be fully insulated.

3.3.03 the insulation of the transformer winding and connection shall be free from insulating components which are liable to soften , ooze out, shrink or collapse and the non-catalytic and chemically inert in transformer oil during services.

3.3.04 Coil assembly and insulating spacers shall be so arranged as to ensure tree circulation of oil coil and to reduce the hot spot of the winding.

3.3.05 tapings shall be arranged as to preserve the magnetic balance of transformers at all voltage ratio.

3.3.06 The fault level of 6.6KV systems to which these transformers are to be connected is 40KA. Transformers manufacturer shall take this aspect into account while designing the transformer for the through fault withstand capability for two seconds. The contractor shall give supporting calculation for the same.

3.4 INSULATING OIL

1. The new insulating oil, before pouring into the transformer (i.e. 10% topping up oil ) shall confirm to the requirement of IS:335 No

inhibitors shall be used in the oil.

2.The oil samples taken from the transformer at site shall conform to the requirement of IS: 1866 and the value parameters shall not lie very close to the limiting values specified in IS: 1866 with respect to the reconditioning of oil.

3.The contractor shall dispatch the transformer filled with oil or nitrogen in the former cases, the contractor shall take care of the weigh limitation or transport and handling facility at site. In the later case necessary arrangement shall be ensured by the contractor to take care of pressure drop of nitrogen during transit and storage till completion of oil filling during erection. A gas pressure testing value with necessary pressure gauge and valve shall be provided. In such case, sufficient quantity of oil required for first filling of tank, coolers and radiators to the proper level should be supplied.

4.Five percent (5%) extra oil shall be supplied for topping up . in non returnable containers suitable for outdoor storage.

3.5 OIL PRESERVATION SYSTEM

The transformers shall have one of the following types of oil preservation system.

3.5.01 CONVENTIONAL CONSERVATOR

The transformer shall be provided with conventional single compartment conservator with dry air filling the space above the oil. The top of the conservator shall be connected to the atmosphere through a silica gel breather. The Buchlolz relay shall also be provided as specified.

The conservator shall be fitted with a silica gel filter breather, which shall be so designed that:

#Passage of air through a dust filter and silica gel.

#Silica gel is isolated from atmosphere by an seal oil.

#Moisture absorption indicated by a change on colour of the tinted crystal can be easily observed from a distance.

#Breather is mounted not more than 1400mm above rail top level.

3.5.02 SEALED TANK

The space above the oil in the transformer shall be filled with dry air. The ratio of expansion space to cold oil volume shall be designed to limit the pressure within the tank to a safe value under all climatic and load condition. A sudden pressure relay shall be provided to detect the sharp rise in internal pressure. An electrically insulated trip contact shall be provided in sudden pressure relay. in addition , a pressure gauge with alarm contact shall also be provided.

TERMINAL ARRANGEMENT 3.5.03 1) BUSHING

#The bushings shall conform to the requirement of IS: 2099 &IS: 3347.

#All transformer bushing shall be of porcelain.

#Bushing terminals shall be provided with suitable terminal connectors of approved type and size of cable termination of HV side.

#Where current transformers are specified, the bushing shall be removal without disturbing the current transformer.

#The neutral terminal of primary winding transformer shall be brought out, through an outdoor an outdoor bushing. Further this neutral terminal shall be connected by copper flag of size 50 mm* 6mm, which shall be insulated and supported by the tank body.

2) CABLE BOXES

#Wherever cable connections are specified, suitable cable boxes shall be provided and shall be air insulated. They shall be of sufficient size to accommodate owner#s cables and to allow easy termination.

#Cable boxes shall have drilled bus bars of adequate size to receive owner#s cables and to allow easy termination.

#Removable drilled gland plates shall be provided in the cable boxes.

#The additional supports for the cable boxes shall be galvanized.

#The contract shall provide earthing terminals on the cable box, to suit owner#s 50mm *6mm GI flat.

#The HV side cable boxes shall be suitable for terminating 6.6KV PVC /XLPE cables & the LV side cable boxes shall be suitable for terminating 1000V PVC /XLPE cables. The number and size of cable shall be intimated to the successful bidder.

#All necessary cable terminating accessories such as supporting clamps shall be as specified in technical parameters. A suitable

arrangement of releasing the pressure during faults shall e provided. Cable boxes shall be of degree of protection IP: 55 as per IS:2147

3.6 CURRENT TRANSFORMER

1.The protection CT#s on neutral grounding transformers shall be bushing mounted with the ratings as indicated under technical parameters. It shall be possible top remove the current mounted CT#s from the transformer tank without removing te tank cover.

2.The current transformer shall comply with IS: 2705.

3.All secondary leads of bushing mounted CT#s shall be brought to terminal box near each bushing and then wired up to transformer marshalling box. The CT terminal shall have shorting facility.

4.CT parameters indicated under Technical parameters are tentative and are liable to change within reasonable limits. The contractor shall obtain owner#s approval before proceeding with the design of CTs.

3.7 TERMINAL MARKING

The terminal marking and their physical position shall be in accordance with IS:2026 unless specified otherwise . 3.8 RADIATORS

The radiators shall be detachable type, mounted on the tank each radiator shall be provided with the following:

1.A drain valve at the bottom

2.An air release plug at the top.

3.Shut off valve at each point of connection to the tank. The location and configuration of radiators shall be subject to owner#s approval.

3.9 MARSHALLING BOX

1.A sheet steel whether, vermin, and dust proof marshalling box shall be furnished with each transformer to accommodate.

# Temperature indicator.

# Terminal blocks for incoming and outgoing cables.

2.The sheet steel used shall be at least 2.5 mm thick. The box shall be freestanding floor mounted/ tank mounted type and have a sloping roof. The degree of protection shall be IP: 55 in accordance with IS: 2147.

3.The temperature indicators shall be so mounted that dials are not more than 1600 mm from ground level.

4.The marshalling box shall have a glazed door of suitable size for temperature indicators reading.

5.All incoming cable shall enter the marshalling box from the bottom. A drilled gland plate shall be provided at the bottom of the box for owner#s incoming and outgoing cables.

6.All devices and terminal blocks inside the marshalling box shall be clearly marked by symbols corresponding to those used on applicable schematic or wiring.

7.The marshalling box shall be supplied with the space heater and cubical lighting OFF switches and associated fuses.

8.It shall be located in such a way that, the same shall not face towards transformer.

9.The gland plate shall be made into two detachable halves, for termination of owner#s cable and contractor cable separately. The gland plate associated compartment shall be sealed in a suitable manner to prevent the moisture, rodents, insects etc.

3.10 PAINTING OF TANK, CONSERVATOR RADIATOR AND ACCESSORIES P

PARTS NAME TYPE OF PAINT NO.OF COATS TOTAL DFT

Inside of tank and accessories
(except M Box) Oil & heat resistant fully glossy white One coat	Atleast 30 micron
External surface of transformer and accessories including	M Box (except radiator) Chemical resistant epoxy zinc phosphate

primer, MIO (Micaceious iron oxide) as intermediate paint followed by polyurethane finish paint (RAL 5012 Blue) One coat each Atleast 100 micron

External radiator surface Anticorrosive primary paint followed by high quality full glossy outer finish paint (RAL 5012 Blue) Two coats each Atleast 100 micron

Internal radiator surface Hot oil proof, low viscosity varnish and subsequent flushing with transformer oil --- ---

Internal surface of M Box Chemical resistant epoxy zinc phosphate primer followed by chemical and heat resistant epoxy enamel white paint Two coats each Not less than 100 micron

3.12 BOLTS AND NUTS

All bolts and nuts exposed to weather shall be hot dip galvanized or cadmium plated passivated steel, all bolts, nuts and washers in contact with non-ferrous parts, current path, shall be of phosphor bronze, where the transfer of current is through the bolt.

3.13 CONTROL WIRING

I. All controls, alarm, indicating and relaying devices provided with the transformer shall be wired b bidder up to the terminal blocks inside the marshalling box. The contractor shall supply and install the required 1100V grade heavy duty PVC insulated , steel wired armored, PVC sheathed, multicore cables with copper conductors of at least 2.5 sq. mm conforming to IS:1554. The cables shall be properly supported, clamped& dressed. Not more than two (2) wires shall be connected to one terminal. At least 20% spare terminals shall be provided. Each terminal shall be suitable for connecting two 7/0.737 mm stranded copper conductor from each side.

II. Terminal connector for control cables shall be of KLIPPON type (RSF1) with insulating material of melamine conforming to ES1 standard 12-1 or equivalent.

III. CT terminal blocks shall be provided with test links and isolation facilities. CT secondary leads shall be provided with circuitry and earthing facilities. It shall be of Elmex-CATD type or equivalent.

3.14FITTINGS

3.14.01The following fittings (wherever applicable) shall be provided with all the transformers unless mentioned specifically otherwise.

1. Conservator with oil filling hole & cap, isolating valve , drain valve, vent valve and oil preservation equipment as specified. 2. Magnetic oil level gauge with low- level alarm contacts. It shall be welded to the tank.

3. Prismatic glass oil level gauge.

4. Pressure relief valve/expansion vent.

5. Air release plug.

6. Inspection opening and covers.

7. Bushing with metal parts and gasket to suit the termination arrangement specified in Technical parameters. 8. Oil temp Indicator, with alarm and trip contact.

9. Winding temperature indicator(s) with alarm and trip contacts.

10. Covers, lifting eye, transformer lifting lugs, jacking pads, towing holes, core and winding lifting lugs, supporting structure, foundation bolts.

11. Protected type mercury or alcohol in glass thermometer.

12. Bottom and top filter valves with male adaptors, bottom sampling valves and drain valve. 13. Rating and diagram plates.

14. Marshalling box.

15. Cable box(s).

16. Buchlolz relay.

17. Dehydrating filter breather.

18. Bushing current transformers (wherever applicable).

19. Earthing terminals.

3.15PERFORMANCE:

3.15.01 OPERATING CONDITION:

a.The transformers shall be capable of being located in accordance with IS: 6600 .There should be no limitation imposed by bushings, tap changer etc.

b.The transformers shall be capable of being operated continuously without danger on rated KVA with the following voltage and frequency variation.

i.+/- 10% corresponding to the voltage

ii.Frequency variation of +3% & -5%.

iii.Combined voltage and frequency variation of 10%.

3.15.02 SPECIAL CONDITION

Contractor shall submit the following calculation during detailed engineering for owner#s approval.

1)Estimated short circuit forces under short circuit for the specified duration. i. Maximum axial force.

ii. Maximum radial force.

2)Measurement adopted for windings connections and all other accessories to with stand the above forces and thermal effects of the short circuit current.

3)Owner#s approval does not absolve the contractor of his responsibility regarding withstand capability of the transformer.

4)Owner#s intends to assess the performance of flanged/ welded joints of transformer under thermal shock conditions, bidder shall quote for a special test on transformer, which shall be subjected to 3 cycles of thermal shock, (from ambient temp to the max oil temp in one cycle) and the transformer oil shall not leak through joints. Bidder shall include the price for this test in his offer.

3.15.03 FAULT CONDITION

i.The transformer and all accessories including CT#s etc, shall be capable of withstanding for two (2) seconds without damage any external short circuit at bushing terminal.

ii.The flux density at normal voltage and frequency shall be such that flux density in any part of the core and yoke at any tap position with 10% voltage variation from the voltage corresponding to the tap shall not exceed 1.9 wb/Sq.m.

iii.Transformer shall accept without injurious heating combined voltage and frequency fluctuations which produce on over fluxing condition of 120% for one (1) minute, Bidder shall indicate 150% over voltage withstand time.

iv.Noise level when energized at normal voltage and frequency shall not exceed 58db, when measured under standard conditions as per NEMA standard publication Tr-lm.

4) INSPECTION AND TESTING

THE vendor shall carry out a comprehensive inspection and testing program during manufacture and commissioning of the transformer. An indication of inspection envisaged by the Engineer#s is given under clause 5.1 this is however, not intended to form a comprehensive programme as it is Vendors responsibility to draw up and carry such a programme , duly approved by the engineer .

5) INSPECTION :

i. TANK AND ACCESSORIES

a)Physical and dimensional check of transformer tank and accessories.

b)Crack detection of major strength weld seams by dye penetration test. ii. CORE

a. Physical inspection and check of quality. if used.

b. Sample testing of core material for checking specific loss, bend properties, magnetization characteristics and thickness.

c. The insulation of the core to bolts and core to clamp plates shall be able to with stand HV test of 2KV (RMS) for one (1) minute. d. Check for inter laminar insulation between core sections before and after pressing.

iii. INSULATING MATERIAL

a. Sample checks for physical and electrical properties of the material, as per relevant IS. b. Check for a DI-electric strength.

c. Check for the reaction of hot oil on insulating material.

iv. ASSEMBLED TRANSFORMER

a. CHECK COMPLETE transformer against approved outline drawing position for all fitting and on insulation covering. b. Jacking test on all the assembled oil filled transformer and followed by dye penetration test.

v. OIL

All standard tests in accordance with relevant standards shall be carried out an oil samples taken from the transformer before and after testing of the transformer.

vi. The bidder shall submit test report for all bought out/ sub contracted items and shall submit the same to the Engr. For approval, such test shall include the following components.

a. Buchholz relay.

b. Winding temperature indicator. c. Bushings.

d. Marshalling Box. e. Oil temp Indicator.

f. Pressure relief device.

g. Magnetic oil level gauge.

6) FINAL TESTING ON FINISHED TRANSFORMER.

i.All standards routine test in accordance with IS: 2026 shall be carried out on each transformer. Type tests in accordance with IS: 2026 shall be conducted on one transformer.

ii.Owner reserve the right to get conducted certain or all type tests on one transformer. The charges for conducting each of the type tests/ special test shall be indicated separately for each transformer in the bid proposal sheets (BPS, vol1) and the total charges included in the bid price. Owner at his discretion may ask the bidder to conduct any or all type test. The contractor price shall be adjusted based on unit price quoted in the BPS. However the total charges of all types as indicated by the bidder in the BPS shall be considered for evaluation purpose.

At least four (4) weeks advance notice shall be given for witnessing the type tests. Following tests no. 2 to 9 may be made in any convenient sequence. Test no. 10 to 19 shall be made in the sequence as given:

1. Oil samples to comply with IS: 1866 routine test. 2. Measurement of winding resistance.

3. Measurement of voltage ratio.

4. Vector group and polarity test. - Routine test.

5. Measurement of impedance voltage / short circuit impedance at, load losses routine test.

6. Measurement of no load losses and magnetizing current at rated frequency and 90%& 110% rated voltage # routine test. 7. Noise level measurement # type test.

8. Measurement of zero phase sequence impedance #type test. 9. Measurement of the harmonics of no load current- Type test. 10. Measurement of insulation resistance #Type test.

11.Temp. Rise test.

12.Oil samples.

13.Insulation resistance (repeat) #routine test.

14.Dielectric test # Type test

a. Power freq/separate source AC withstand voltage test-routine test

b.Chopped wave Lighting impulse voltage test on all the three limbs as per clause of IEC: 60076-type test c. Induced over voltage withstand test-routine test

15.Measurement of iron loss (repeat after induced over voltage test).-routine test.

16.Measurement of capacitance test and ten-delta #type test.

17.Degree of protection test for marshalling box as per IS-2147 as follows.

i.It shall not be possible to insert a one (1) mm dia steel wire into the enclosure from any direction, without using force.

ii.It shall not be possible to insert a thin sheet of paper under gasket and through enclosure joints.

iii.TANK TEST

a. ROUTINE TESTS/OIL LEAKAGE TEST

All tank and oil filled compartments shall be factory tested for oil tightness by using completely filled with oil of viscosity not greater than that of insulating oil conforming IS:335 at the ambient temp and applying a pressure equal to the normal pressure plus 35 KN/Sq.m measured at the base of the tank. The pressure shall be maintained for a period of not less than 6 hours during which time no sweating or leakage of oil shall occur. The gasket and flange used shall be capable of meeting the above requirement. The gasket shall not deteriorate during the life of transformer if not opened for maintenance at site. Supplier shall also be recommend quality and make of gasket to be used for replacement during maintenance if required. Supplier shall also recommend the arrangement like oil bath and heating element to maintain the temp of oil bath to preserve spare gasket to have a longer shelf life of at least 10 years. All joints and flanged or welded associated with oil shall be such that no oil shall be such that no oil leakage or sweating occurs during the life of transformer. The quality of these joints is considered established, only if the joints do not exhibit any oil leakage or sweating for a continuous period of at least 3 months during the guarantee period. In case any leakage /sweating is observed, contractor shall rectify the same and established for a further period of three months of the same. If it is not established during the guarantee period, the guarantee period shall be extended until the performance is established.

b. TYPE TEST:

i.VACUUM TEST :As per CBIP norms

ii.PRESSURE TEST:As per CBIP norms

iii.The pressure relief device shall be subjected to increasing fluid pressure. It shall operate before reaching the test pressure as specified in above clause. The operating pressure shall be recorded. The device shall seal off after the excess pressure has been released.

iv.In addition to the above, the following checks should be carried out at manufacturer works before dispatch for all transformers.

a.Check for interchangeability of component of similar transformers and mounting dimensions.

b.Check for proper packing and preservation of accessories like radiator, transformer bushing, explosion vent, dehydrating breather, Buchlolz relay, conservator etc.

c.Check for proper provision of bracing#s to arrest the core and winding assembly inside the tank.

Test for tightness and derivation of leakage rate to ensure adequate reserve gas capacity during transit and storage.

B)SCOPE OF WORK

The scope of work includes:

1.Supply of Neutral Grounding transformer and Neutral Grounding Resistor.

2.Erection, testing and commissioning of the Neutral Grounding transformer with NGR.

3supply of cable and cable laying is in NTPC scope. Detailed scope of work:

The scope also includes but not limited to the following services/items described herein and elsewhere in specification:

1)System Design and Engineering

a)Contractor shall provide complete engineering data, drawings, reports, manuals, etc. for Owner#s review, approval and records.

b)The scope shall also include the design and engineering as per details elaborated elsewhere in this specification.

2)Supply of Equipment and Material

Scope shall cover the supply of the following.

# Neutral Grounding Transformer with insulating oil all material &accessories complete in all respect like Gland plates, anchor bolt etc along with NGR.

3)Erection Works

a)The Contractor shall construct, erect and install all NGTS along with NGR of the neutral grounding system covered under the package

He shall be responsible for provision of all labour, tools and plant, and supervisory staff for safe, reliable, proper and correct erection of project components. However supply of cable and cable laying is in NTPC scope. No other material or manpower shall be provided by NTPC.

b)As the work is to be carried out in an operational power plant, the contractor has to employ suitably skilled manpower and supervision personnel. The contractor is solely and fully responsible for the safety of personnel and materials. Any damages to the existing equipments shall be made good by the contractor as directed by the engineer-in-charge at no extra cost to the Owner. The contractor shall coordinate with site personnel for arranging shut down for interconnections with the existing systems.

c)The Contractor shall ensure periodic cleaning of work sites and removal of all waste material, packing material and leftover and their proper disposal.

d)Civil works if required shall also be in the scope of the bidder.Bidder is advised to visit the site and get a first hand information of the site requirement which shall help them to understand better.

4)Testing and Commissioning

a)The scope includes testing and commissioning of all equipment, sub-systems and systems of the project and putting them into successful commercial operation. The scope shall include but not limited to the requirements given elsewhere in the specification.

b)The Contractor shall be responsible to provide all necessary testing and commissioning personnel, tools, test equipment, etc.

5)Interface Coordination

a)The contractor shall be responsible for collecting all the information/data of existing equipments/material/systems. The Owner shall only assist the contractor wherever possible to provide information/data.

b)The Contractor shall identify all interface issues with Owner and other agencies, and shall be responsible for such interfacing, coordination and exchange of all necessary information.

C) TIME PERIOD

The contract shall be valid for 18 months from the date of award.

After design, engineering approval and supply ,the final erection, testing and commissioning will have to be completed within 20 days (during major overhaul of the machine). The work shall be carried out in a phased manner unitwise after the unit is under shutdown. The contract period may be extended for a duration of 6 months.

D) DEFECT LIABILITY

Defect Liability will be two year after completion of successful commissioning

Quality Checks:-

1.Detailed Drawing/ Data-sheet/ Specifications along with detailed Bill of material (if applicable) to be got approved from indentor.

2.Detailed QAP (NTPC format) along with acceptance norms, to be submitted along with the offer for approval from BTPS (FQA)

and Indentor.

3.Material to be checked at vendor#s works as per approved QAP, Drawing, Data-sheet & specifications.

4.Vendor is to submit Test, Guarantee & Fitment certificate during inspection.

5.All material should bear manufacturer identification including part no/ catalogue no/ model etc.

Important Notes for Bidders:

1.Bidder are requested to submit offer online in SRM, Hard copy is not acceptable.

2.Detailed specification mentioned in information from purchaser in Item data tab shall be final.

3.Bidders are requested to open output preview and cross verify the quoted rates, P&F charges, taxes, duties, transportation, insurance etc.

4.Bidders are requested to quote either with VAT or CST. BTPS is situated in Delhi , Bidder supplying material from outside Delhi are requested to quote CST and Bidder supply material from Delhi are requested to quote VAT. Bidder may pls note that BTPS is authorized to issue C- form ,where ever applicable.

5.If bidders wants to regret some item(for item wise evaluation), pls leave all the field in item data-see conditions tab as blank and ignore the warning of item rate being zero.

6.All the catalogues/Technical data/part number etc are to be attached in C # Folder.

7 You are requested to quote as per unit of measurement and per unit quantity required in item data

Say if the rates are required to filled up per 1 number, the price for 1 number should be filled up in item data.

Say if the rates are required to be filled up per 1 meter/ 1 MT, the price for 1 meter/ 1 MT should be filled up in item data.

Don#t# change the unit of measurement or per -----

number.

Pls note:

Red square: Error - need to be removed and click on check messages to see whether the error has been removed. Yellow Triangle: Warning only.

Green circle: Information only

6.0 Prospective bidders from U.P. State are compulsorily required to provide TIN number at the time of purchase of bidding documents.

7.0Qualifying Requirements for Bidders:

1.0 (i) The Bidder should be a manufacturer of transformers of rating 275 KVA, 6.6/0.415 KV or more & should have service/repair centre in India.

2.0 The bidder should have executed any one of the following Similar Works In India in the preceding seven years as on the date of opening of Techno-Commercial proposal:

One Work of value not less than Rs 68.16 lacs (Rupee Sixty eight lakh and sixteen thousand only) OR

Two works of value not less than Rs 42.60 lacs (Rupee forty two lakhs and Sixty thousand only) each. OR

Three works of value not less than of Rs 34.08 lacs (Rupee Thirty four lakhs and Eight thousands only) each.

Note:

2.1 #Similar# works means any work which includes #Supply of transformers of rating 275 KVA OR more#.

2.2The work #executed# mentioned above means the bidder should have achieved the criteria specified above, even if the total contract is started earlier and/or is not completed/closed.

2.3In case of orders under execution, the value of work executed till the date of opening of Techno-Commercial proposal as certified by the Client shall be considered.

3.0 The average annual turnover of the bidder in the preceding three financial years as on the date of opening of Techno-Commercial proposal should not be less than Rs 56.80 lakh ( Rupee fifty six lakh and Eighty thousand only ).

Note:

3.1While computing the annual turnover other income shall not be considered.

3.2In case where audited results for the last preceding financial year are not available certification of financial statements from a practicing Chartered Accountant shall be considered acceptable.

8.0Issuance of Bidding Documents to any bidder shall not construe that bidder is considered qualified.

9.0 NTPC reserves the right to reject any or all bids or cancel/withdraw the NIT for the subject package without assigning any reason whatsoever and in such case no bidder/intending bidder shall have any claim arising out of such action.

10.0 Address for Communication

Amanpreet Kaur Dy.Mgr(Pur), 9650992502

Websites: https://etender.ntpclakshya.co.in/sap/bc/gui/sap/its/bbpstart or www.ntpctender.com or www.ntpc.co.in