Annual Overhauling works of 6.6 kV HT Switchgear Panels Breakers and Bus Ducts in 4A 4B and C3A Buses in UNIT IV and Station Bus for the year 2021 22

Overhauling of 6.6 kV HT Panel : Charges for releasing the back doors (top and bottom),Bus separator, racking out of HT Breakers/Bus VT and cleaning of all the released doors and checking of IR value of Bus.2)Charges for complete cleaning of Horizontal, vertical busbars Panels and supporting insulators with the help of air blower and Acetone , tightness checking of Horizontal, vertical bus-bars and outgoing power cable terminals.3)Charges for re-fixing of back doors(top and bottom) by providing all bolts and nuts racking in the HT breaker and checking of IR value and satisfactory commissioning.

Charges for Annual Maintenance of 6.6 kV SF6 gas HT Breakers : Charges for Overhauling of H.T. Breakers mechanism, Breaker cover opening mechanism cleaning, checking and oil lubricating and Breaker Control wiring tightness checking, Breaker operation and Interlock arrangements checking and Breaker cover refixing.

Testing of H.T. Breakers : Charges for transporting of breakers to MRT test bench, preparation of breaker for contact resistance test and closing/opening time test, cleaning of contacts if required, transporting the tested breaker again to the panels.

Checking of SF6 Gas Pressure in breakers: Charges for checking of SF6 gas pressure and leakage test in all H.T. Breakers in Unit Bus 4A, 4B, & C3A bus including cost of consumables.

Topping Up of SF6 Gas in Breakers : Charges for transporting of Gas level reduced breakers from SWGR room to Breaker testing room, Arranging for filling of SF6 gas from SF6 Gas cylinder to breaker, topping up the level from Red zone to Green Zone in breakers in Unit Bus 4A, 4B & C3A bus including cost of consumables.

Annual Maintenance of Bus duct from TIE C3A to 4A : Charges for opening of manhole covers, removing and cleaning the bus, tightness checking of Bus bar joints and Insulator cleaning including cost of consumables.

Annual Maintenance of Bus duct from TIE C3B to 4B : Charges for opening of man hole covers, removing and cleaning the bus, tightness checking of Bus bar joints and Insulator cleaning including cost of consumables.

ANNUAL MAINTENANCE OF SPACE HEATER TRANSFORMER & Module: Charges for Opening of Space heater Transformer box cover removing, and measuring of IR Value before cleaning, cleaning, tightness checking and after completion of work measuring of IR Value of the transformer and refixing of Space heater Transformer box cover. Charges for cleaning and tightness checking of related Space Heater Module, Distribution Boxes and incoming cables and outgoing cables and terminal links. including cost of consumables.

D.R.ELECTRICAL WORKS