NIT 13 Item 6

Dismantling of Analog / Thermal type IDMT Protection Relay with earth fault and over current protections from the LT panels / Breakers in safe and sound condition after disconnecting all the wiring connections of the Relays and proper discharging the LT CTs in safe manner.

Refixing of the relays back in their LT Panels / Breakers including reconditioning / restoration of their wiring connections at the panel, checking of the Tripping Circuit, setting up of tripping range of the Relays as per load requirement.

Providing and fixing of adapter sheet made out of CRCA Sheet / Bakelite of size as per required for mounting of the Relays with nut bolts etc. as required in alignment for mounting at LT Panel chambers. Installation of the new Protection Relays at new sheet as required with proper mounting accessories as per guidelines.

Making the required wiring connections of the Relays between the main CTs and Relays as well as Breakers tripping system and the Relays by existing or by providing, laying and connecting of new copper cables including thimbling and providing all consumables as required.

Testing and commissioning of the new installed Relays for their required operation and tripping. Configuration and setting of the fault levels of the Relays and checking for their fault tripping at their respective Breaker for over current and earth fault etc., as per site requirement.

Supply of Ampere Meter Make: - L&T/Any Other DJB Approved Make

Supply of Indicating Lights Make: - L&T/Any Other DJB Approved Make

Supply of CT’s 800/5 Tape Bound as per sample

Supply of MCCB DN0-100M (100A) / 3P / 50KA Make L&T/Any Other DJB Approved Make

Supply of MCCB DN3-400D (320-400A) / 4P Make L&T/Any Other DJB Approved Make

Supply of ASS 6A Make L&T/Any Other DJB Approved Make

Supply of VSS 6A Make L&T/Any Other DJB Approved Make

Supply of Power Pack Unit as per sample

Supply of Tripping Coil 24VDC for MOCB / OCB as per sample

Supply of PT as per sample

Dismantling of the old materials and fixing of the new materials as above along with making their connections by wiring with the existing wires or by restoration of defected wiring connections etc. as required at site including making required setting with CT Ratio for LT / HT Supply etc. in proper shut down conditions as required.

Renovation of Panel indication system by replacement of Indicators as above as required along with making their connections by wiring with the existing wires or by restoration of defected wiring connections as required at site including providing and fixing of new control arrangement with complete wiring connections as required in proper shut down conditions.

Complete Testing of all the metering and indicating system including checking of wiring, resetting of Meters, setting up of CT Ratio etc. and all the work required for proper functioning of instrument as per requirement.

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