Up gradation of substation at Lilabari Airport including replacement of OCB with latest technology Circuit Breaker

Amount

SH: I 11KV HT PANEL BOARD Design ,Supply, Installation, Testing & Commissioning of indoor type (IP 4X) floor mounted metal clad, 11 KV Switch Board VCB panel with 4 Nos. VCBs, totally enclosed & fully interlocked,truck mounting, horizontal draw out, horizontal isolation type vacuum breaker as per IS / IEC 62271-100 & 62271-200 for breakers & for panels IS3247 as amended up to date, having capacities as mentioned below, free standing extensible on both sides, single break, trip free mechanism, motorised charged and auto/ manually closing breaker suitable for use on 11 KV, 3 Phase, 50Hz A.C. supply with short circuit fault level of 500 MVA, complete with self contained short time current 26.3 kA for 3 sec, Internal Arc Test for AFLR 26.3 kA for 1 sec at individual compartments i.e busbar, VCB, and cable compartment, rack in and rack out mechanism, air insulated but encapsulated copper bus bars capacity meeting fault level current , DC power pack,breaker featured with mechanical ON / OFF indicator with hand trip device, Breaker control TNC switch and all accessories such as shunt trip coil, and auxiliary switch of 4NO+4NC, motorised and manually operated spring assisted closing mechanism, emergency trip push button, interconnections,space heaters, earthing, etc. and equipped with following switchgears and accessories, connections suitable for cable upto 3C x 120 sqmm XLPE cable of 11 KV grade (cable entry from bottom), Separate earthing switch shall be provided for Cable earthing . The earthing truck shall be so designed that it is impossible to earth a live cable terminations suitable for 3C x 120 sq.mm. XLPE 11 KV cable.

A. Incomer 2 Nos. each consisting of following; 1 No. of 630/800 Amp , 11 KV , 3 Ph, 3P 1 No - Multifunction Meter with accuracy class 0.5 LED display of I ,V, Hz, Active, Reactive , Apparent Power & Energy, Power factor, %THD , Maximum demand load, (complying with IEC61557-12) with RS 485 & Ethernet port and protection MCB and required accessories to complete the system. 3 No. Cast resin drawout type PTs 11 KV / √3 / 110 √3, class 0.5, 50 VA burden including HT HRC fuse on 11 KV Side and MCBs on secondary side protection. 3 No. Cast resin insulated Dual core 3 CTs 100 / 5-5A of 10VA burden and accuracy Class -0.5 for metering and class 5P10 for protection. Aux. relays for Anti Pumping & indication. Trip Circuit supervision relay '- Master Trip Circuit Relay 1 No. Micro processor based over current, short circuit 50,50 N & earth fault numerical IDMT relay with having RS 485 modbus communication facility consisting 3 element for over current relay and one earth fault capable of storing last 10 trip history. 1 No. Over & under voltage protection relay. 1 No. Over & under frequency relay. 1 No. Alarm annunciator with minimum 8 windows and buzzer, ACK, rest, test push button for transformer faults and electrical faults in respective window.

B. Busbar 630/800 Amps TP, 12 KV Copper Bus bar with heat shrinkable insulated sleeves with cast epoxy insulator to withstand full short circuit currents upto 26.3 kA for 1 second. C. Outgoings 2 Nos each consisting of following; 1 No.630/800 Amp., 11 KV VCB horizontal draw out type VCB with motorized spring charge mechanism, T/N/C switch and required safety switchgears complete. Aux. relays for WTI, OTI & Buccholz protection. (Both alarm & trip) Trip Circuit supervision relay '- Master Trip Circuit Relay 1 No. Micro processor based over current, short circuit 50,50 N & earth fault numerical IDMT relay with having RS 485 modbus communication facility consisting 3 element for over current relay and one earth fault capable of storing last 10 trip history. 1 No - Multifunction Meter with LED display of I ,V, Hz, Active, Reactive , Apparent Power & Energy,Power factor, % %THD , Maximum demand, (complying with IEC61557-12) with RS 485 & Ethernet port and protection MCB and required accessories to complete the system. 3 No. Cast resin insulated Dual core 3 CTs 50/5-5A of 10VA burden and accuracy Class -0.5 for metering and class 5P10 for protection. 1 No. Auxiliary relays for transformer faults WTI with alarm, trip and hooter 1 No. Alarm annunciator with minimum 8 windows and buzzer, ACK, rest, test push button for transformer faults and electrical faults in respective window.

D. All I/C & O/G Breaker having following Accessories & indications 6A MCB for spring charge, DC Control Supply healthy & fails Surge Arrestor of type 1,11KV grade shall be provided for all phases of each incomer AC Supply control ON/OFF Switch Circuit breaker failure Alarm indication VCB spring charge indication LED Illumination lamp ON / OFF with limit Switch T-N-C (Trip, Neutral, Close) breaker control switch with indication arrangement. All control wiring with protection & test terminal block as required. (i) Emergency trip push button, (ii) 2A MCB for lamp 60 watts space heater with thermostat 16 Amp MCB for space heater and plug point 6/16 Amps 5 Pin with piano type switch socket outlet Supply, fixing, testing and commissioning of automatic linear pneumatic tube Detection based Clean agent System for Electrical Panels (Linear Pnuematic Heat Detection tube Panel Protection System),consisting of the Mentioned components Suitable capacity , Direct Low Pressure (DLP) Assembly with automatic valve, push in connector for tube, Clean agent, mounting bracket, End of Line adopter and low pressure switch for monitoring system activation. i) Linear Pneumatic Heat detection tube with all necessary & supports ii) Master Control Unit for controlling each system, complete with pressure switches, buzzers and electronic hooters, including all necessary accessories + electrical wiring to make each entire system functional. 11 KV HT PANEL BOARD Consisting of above items

Supplying and making indoor cable end termination with heat shrinkable jointing kit complete with all accessories including lugs suitable for following size of 3 core, XLPE aluminium conductor cable of 11 KV grade as required :

3 Core, 120 Sq.mm.

DISMANTLING OF OCBs

Dismantling of the existing HT Panel complete with all accessories and transportation to AAI store as directed by Engineer-in-Charge .

S chowdhury and Company

Awasthi Electric Works

jaydeep agency corporation

Manish Electricals

Avon Electricals