Public Works Department

Public Works Department has published Tender For Special Repair To 11Kv Ht Transformers, Load Optimization In Periyar Government Hospital, Periyar Nagar, Chennai-82.; 1 1. single Panel Consumer VCB:Supply, erection, testing, commissioning and of 11KV 25KA HT single panel Vacuum Circuit Breaker Switch, Indoor type for installation, board comprising one Incomer VCB 630A 500MVA VCB.1.Draw out type 11KV 500MVA 630A Horizontal Draw out/ Horizontal Isolation VCB operated with spring charged mechanism.Anti Pumping device ,110V DC Shunt Trip and closing Coils (DC source of supply to be derived from a Power pack suitable for 3 Tripping and Two closing operation counter, 4NO + 4NC spare Aux. Contact for customer use, Automatic safety shutter, Mechanical Close/ Trip knob, Mechanical ON/OFF indication, Operating Handle, 110V AC-D109110V DC Power Pack etc. (Incom-1 & Outgoing-2Nos)Core(Core 1-15VA class 1 for metering and core 2-15VA 5P 10 for Protection) Incoming 1 No, Current Transformers of 30/5-5 Amps Dual Core (Core 1-15VA Class 1 for Metering and Core 2-15VA 5P 10 for Protection)(Outgoing-1)2. 11KV/Root 3/ 110V/ Root3- Three Phase, 3 Limb 200VA Class 1 Resin Cast Draw out type Potential transformers complete with HT and LT HRC fuses. (Incoming-1 No)3. Digital Voltmeter with selector switch (Incoming 1 No) Digital Trivector of L&T/Secure make (Incom-1No) 4. Digital Power Factor Meter (Incom-1 No) Digital Frquency Meter (Incom-1 No)5. Protection: TP ND IDMT 2OC + 1EF Relay with Highest inst.Elements similar like Megawin type MCDG 61 (Incom-1No) 2 6. TP ND IDMT 2OC + 1 EF Relay similar like Megawin type MCDG 31 Master trip Relay Megawin MVAJH 13 (Incom-1No & Out-1 No)7. Breaker ON/OFF/Auto Trip/Healthy/Spring Charged Indication Lamp LED Type8. Phase Indication Lamps R,Y,B(Incomings 3Nos) 9. Control Wiring 10. 630 Amps Copper Bus bar PVC Sleeved and required panel copper earthing.11. Control switch TNC (Incoming-1 No, Outgoing -1No)12.Trip Circuit healthy Push Button(Incoming-1 No, Outgoing -1No)13. Common for Switch gear, MCBs for AC DC Control, Heater ON/OFF Switch with space Heater and thermostat Single phase switch socket, cubicle illumination lamp, Disconnecting type terminal Block.etc.,14. MS Sheet enclosure for Indoor Installations 3 Renewal by supply and fixing of HEAT SHRINKABLE HT CABLE JOINT KIT CONSISTS OF RIGHT ANGLE / STRAIGHT BOOTS, WRAP AROUND SLEEVES, INSULATION TAPE, BUTYL SEALANT, CONSTANT FORCE SPRING, CLAMPS, TINNED COPPER BRAIDS ETC., of size 240-300 sq.mm. 3 core HT Cable Indoor Terminations XLPE 11KV (E) - EPKT 3121 4 Renewal Supply and Laying of 3C x 300 Sq.mm. 11 KV HT XLPE cable in a suitable 6 duro pipe to be excavated at a depth of 1 metre and covering the cable completely and refiling the earth to make good.(Make Gloster/Havells/ Polycab) 5 Renewal by Supply and Laying of 2 run of 3 1/2 x 300 sq.mm. PVC armoured LTUG cable in suitable size HDPE pipe in a trench to be excavated at a depth of 0.75 metre and refilling the earth to make good. 6 Renewal by Supply and fixing of brass cable gland for 3-1/2 x 300 sq.mm. PVC armoured LTUG cable with earth connection 7 Renewal by Supply and providing cable end termination of 3-1/2x300 sq.mm. PVC LTUG aluminium armoured cable with necessary aluminium cable sockets by crimping etc with electrical connection complete 8 Shifting of 1000A MV panel with 3 nos ACB by removing the existing electrical & earth connection, relocation in new place, which is not more than 200m, fixing with suitable PCC work with angle iron supports, making the connections complete. Including crane charges for tranpotation & Fuel charges for alternate supply during EB shutdown 9 Renewal by Supply, erection, testing and commissioning of floor mounted cubical door type MS powder coated changeover control panel of Size :1700x1650x400mm with following arrangements. 1) EB by pass arrangement including 3 pole 800 A MCCB-2 nos (MCCB is of L&T/equ.. Make 2) 800 A COS-2 no (ATS is of L&T /equ. Make3) Voltage monitoring relay, VAF combined multimeter of 96 sq.mm-1 по4) Auxiliary contactor 230V5) Control MCB of 6A -6 nos Push button switches, NO, NC control 6) The above accessories are mounted in Indoor type double door floor mountable panel and the panel of energised with suitable aluminium bus bar arrangements . Last date of submission for this tender is 2025-09-12. This is a Transformer Repair tender in Chennai, Tamil Nadu