NCTPS I ES Circle EM I Dn S Dn II Unit I II III Routine maintenance overhauling of important critical modules HT LT breakers switchgears all its busducts for a period of 360 days for the year 2026 27

Unit-I, II & III - HT & LT Switchgear – (1) Carrying out Time bound works for maintenance & overhauling of important critical modules and HT / LT breakers switchgear for the period of 360 days for the year 2026-27 Releasing and cleaning of critical modules, healthiness checking of power Contactor tips and replacing if necessary and terminal tightness of all components and re-fixing the modules in the respective panels. Checking of cable tightness at module end replacing of lugs if necessary for 1 module) LT module 324 Nos for all the 3 units. (Critical modules in USS, BVDC, TVDC, & N/E SWGR)

Releasing and cleaning of defective Soot Blower MCC modules, healthiness checking of power Contactor tips and replacing if necessary and terminal tightness of all components and re-fixing the modules in the respective panels. Checking of cable tightness at module end,(replacing of lugs if necessary for 1 module) LT module (56 Nos per Unit), 168 Nos for all the 3 units. (Critical modules in Soot Blower MCC)

Releasing, checking and cleaning of finger contacts in breaker with acetone, healthiness of spring charging motors and mechanisms, tightness checking of all components of breakers and lubrication of all moving parts and checking their operations and re fixing the breakers. Opening of breaker panel back doors, checking cable tightness, cleaning and re fixing etc. for 1 No. LT breaker. (Critical modules in SSS, USS, BMCC, BVDC & N/E SWGR) Unit – I 28 Breakers Unit – II 23 Breakers Unit – III 20 Breakers

Replacement of spring charge, motor in 6.6 KV HT breaker Unit – I 50 Breakers Unit – II 50 Breakers Unit – III 36 Breakers

Replacement of mechanism in 6.6KV ABB make HT breaker Unit – I 50 Breakers Unit – II 50 Breakers Unit – III 36 Breakers

Charges for cleaning and lubricating of all moving parts of HT breakers, upper and lower pole arms, vacuum bottles with Acetone / IPA. All bolts and nuts tightness checking, checking healthiness of Interrupters, closing / Tripping operations mechanically and checking of IR value for 1 No. breaker. Unit – I, II and III (Station & Unit Switchgear)

Unit-I, II & III - HT & LT Switchgear – (2) Annual overhauling & Maintenance of HT / LT Switchgear and all its bus duct for the year 2026-27 cleaning of 6.6KV, 15.75KV and LT Switchgear , busducts(inside and outside)including insulators etc. 6.6KV breakers panels outgoing cable terminals, busbars inside and outside of the panels including insulators etc. checking tightness of joints, minor rectification works such as replacement of damaged bus support insulators , gaskets inspection covers and panel doors and covers paint touchup , lubricating the breakers mechanism , providing insulation tape in outgoing terminals, checking breaker mechanism replacing parts in breakers etc., and assisting re commissioning works. 1. HT Switchgear Charges for releasing all inspection covers of bus ducts, checking of Initial IR value, thorough cleaning by applying Acetone / IPA and checking healthiness of supporting insulators & tightness checking of bus bar joints and checking of healthiness of Rubber bellows for the Incomer & Tie bus ducts of one bus (U1A, U2A & U3A 6.6KV Switchgear bus duct)

Charges for releasing all inspection covers of bus ducts, checking of Initial IR value, thorough cleaning by applying Acetone / IPA and checking healthiness of supporting insulators & tightness checking of bus bar joints and checking of healthiness of Rubber bellows for the Incomer & Tie bus ducts of one bus (U1B, U2B and U3B 6.6KV Switchgear bus duct)

Charges for releasing all inspection covers of bus ducts, checking of Initial IR value, thorough cleaning by applying Acetone / IPA and checking healthiness of supporting insulators & tightness checking of bus bar joints and checking of healthiness of Rubber bellows for the Incomer & Tie bus ducts of one bus ( C1A - U1A, C2A-U2A link busduct & C3A-U3A tie busduct )

Charges for releasing all inspection covers of bus ducts, checking of Initial IR value, thorough cleaning by applying Acetone / IPA and checking healthiness of supporting insulators & tightness checking of bus bar joints and checking of healthiness of Rubber bellows for the Incomer & Tie bus ducts of one bus (C1B - U1B, C2B-U2B link busduct &C3B-U3B tie bus duct)