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MECON LIMITED50, Chowringhee Road, Kolkata – 700 071

FAX MESSAGE

To Date : 03/02/2007 | Page : 1 of 4

M/s. ABB India Limited9, Lala Lajpat Rai SaraniKolkata 700020Ph : (033) 2283-2911

From : Rupak Biswas, General ManagerMECON, KolkataPh. (O) : (033) 2282-2381/83e-mail : [email protected]

Fax No. (033) 2283 2990 Fax no. (033) 2282-4441

Ref. No. 19.56.9399/

Dear Sir,

Please furnish us budgetary estimations and detailed catalogue of the following equipments for the provided specification as earliest as possible. The equipments will be installed in various 33/11 kV Distribution Substations of WBSEB scattered all over West Bengal. You are requested to indicate applicable taxes & duties separately. Please also indicate delivery time of each equipment.

S.N. EQUIPMENTS SPECIFICATION QTY.

1. Capacitive Duty VCB(Indoor Type)

12 kV, 50 Hz, 3 Ph., 800 A, Bus Bar Short Time Rating = 16 kA for 3s , Short Time Rating of Vacuum Interrupter shall be minimum 25 kA for 3s ,shall be suitable foe 100 Nos. of safe operations at 25kA, Capacitive Switching Duty = 800 A

Dead Front Sheet steel (2mm) enclosed floor mounted horizontal draw out type. Inclusive of side entry cable extension box. Current Transformer Specification11 kV, 50 Hz, 3 Ph., 15 VA, 200-100/1-1 A or 50-25/1-1 A (As per requirement), Cast resin, Dual core, Dual ratio, Acc.Class1.0/5P10.

(1) Electronic Annunciator: Multiway microprocessor based to indicate over current, earth fault and other trouble trip/alarm operation.(2) Voltmeter: 96 mm², 90º scale flush type shall be provided on each breaker panel suitable for direct reading of 0 – 15 kV.(3) Ammeter: 96 mm², 90º scale (nominal current: 1A) flush type for each phase, shall be provided on each breaker panel.(4) Voltmeter Selector Switch: with wing type knob and positions marked RY – YB – BR - OFF shall be provided in each breaker panel against each Voltmeter.(5) Test Terminal Block with cover having sealing arrangement for 3-phase system shall be provided in breaker panel.

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(6) The panel should consist of the following relays: (a) Over current relay : i) High Set Element Current Setting – 500 – 2000% Operating Time – Instantaneous

ii) IDMT Element Current Setting – 50 – 200% Operating Time – 0 – 3sec

(b) Earth fault relay : 10 - 40% nominal current 1A (c) Over voltage IDMT Static relay with setting range 100 – 170% (d) Under voltage relay : with provision for Cut-off at 30% (e) Time Delay Relay : 10 min (f) Unbalance Relay: Neutral Voltage Displacement Static Relay in conjunction with RVT. Alternatively, Unbalance Relay in conjunction with split neutral CT for double star arrangement. The relaying scheme shall have:

i) Alarm for low level of unbalance: Overvoltage on good units is less less than 110%. Delay is greater than 4s.

ii) Tripping for higher level of unbalance: Overvoltage on good units is greater than 110%. Delay is 0.3s to 0.5s. This shall be coordinated to maximum fuse clearing time.

2. Capacitive Duty VCB(Outdoor Type) with integrally bushing mounted Porcelain Clad C.T.

12 kV, 50 Hz, 3 Ph., 800 A, Short Time Rating = 16 kA for 3 sec, Porcelain Clad, structure mounted.Short Circuit Rating of Vacuum Interrupter is minimum 25 kA for 100Nos. operations., Capacitive Switching Duty = 800 ATerminal connectors suitable for 1’’ Al pipe bus.

Current Transformer Specification11 kV, 50 Hz, 3 Ph., 15 VA, 200-100/1-1 A or 50-25/1-1 A (As per requirement), Cast resin, Dual core, Dual ratio, Acc.Class1.0/5P10.

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3. Control & Relay Panel for outdoor type VCB

(1) Electronic Annunciator: Multiway microprocessor based to indicate over current, earth fault and other trouble trip/alarm operation.(2) Voltmeter = 96 mm², 90º scale flush type shall be provided on each breaker panel suitable for direct reading of 0 – 15 kV.(3) Ammeter = 96 mm², 90º scale (nominal current: 1A) flush type for each phase, shall be provided on each breaker panel.(4) Voltmeter Selector Switch = with wing type knob and positions marked RY – YB – BR - OFF shall be provided in each breaker panel against each Voltmeter.(5) Test Terminal Block = with cover having sealing arrangement for 3-phase system shall be provided in breaker panel.(6) The panel should consist of the following relays: (a) Over current relay : i) High Set Element Current Setting – 500 – 2000% Operating Time – Instantaneous ii) IDMT Element Current Setting – 50 – 200%

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Operating Time – 0 – 3sec (b) Earth fault relay : 10 - 40% nominal current 1A (c) Over voltage IDMT Static relay with setting range 100 – 170% (d) Under voltage relay : with provision for Cut-off at 30% (e) Time Delay Relay : 10 min (f) Unbalance Relay: Neutral Voltage Displacement Static Relay in

conjunction with RVT. Alternatively, Unbalance Relay in conjunction with split neutral CT for double star arrangement. The relaying scheme shall have:

i) Alarm for low level of unbalance: Overvoltage on good units is less than 110%. Delay is greater than 4s.

ii) Tripping fir higher level of unbalance: Overvoltage on good units is greater than 110%. Delay is 0.3s to 0.5s. This shall be coordinated to maximum fuse clearing time.

4. Neutral Current Transformer(Outdoor Type)

11 kV, 50 Hz, 3 Ph ., 15 VA, 20/1 A, Acc. Class 1.0Porcelain Clad, structure mounted.

100

5. Potential Transformer & RVT(Outdoor Type)

11 kV, 50 Hz, 3 Ph ., 50 VA per Ph. Acc.Class - 1/3P/6P11 kV/ 3 / 110 V/3 / 110 V, Structure mounted.

300

6. Reactor11 kV, 50 Hz, 3 Ph ., Short Current Rating 16kA for 2 secOutdoor type, Unshielded Air Cored ReactorAir cooled, single / multilayer, cylindrical wound units made upon weather resistant fibreglass epoxy tubes.Reactor coil winding of aluminium with insulated conductor.The ratings of reactors and their tentative nos. are as below:

300

Rated O/P Tentative No. Rated O/P Tentative No.4 kVAR 50 50 kVAR 2010 kVAR 50 60 kVAR 2020 kVAR 50 80 kVAR 2030 kVAR 50 100 kVAR 2040 kVAR 30 120 kVAR 20

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7. Capacitor Bank12.1 kV, 50 Hz, 3 Ph. Star (Single or Double as per manufacturer’s design, please specify), Floating neutral in case of double star. Individual units rated for 12.1/3 kVFuse : Internal / External as per manufacturer’s practiceDielectric : PolypropyleneElectrode : Aluminium FoilElement : Extended foil typeImpregnant : NPCB, Non toxic, biodegradableDischarge device : Built in The ratings of the capacitor banks and their tentative nos. are as below:

300

Rated O/P Tentative No. Rated O/P Tentative No.100 kVAR 50 1250 kVAR 20

250 kVAR 50 1500 kVAR 20

500 kVAR 50 2000 kVAR 20

750 kVAR 50 2500 kVAR 20

1000 kVAR 30 3000 kVAR 20

Please treat the matter as urgent.

Thanking you,

Yours faithfully,for MECON Limited,

( RUPAK BISWAS )

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