NCTPS I ES Circle EM I Dn S Dn II Unit I II III Work Contract for maintenance overhauling of important critical modules HT LT breakers switchgears all its busducts for the period of 360 days for the year 2025 26

Amount

I. Unit-I, II & III – HT & LT Switchgear (1) Carrying out Time bound Works for maintenance & overhauling of important critical modules and HT/LT breakers switchgears. 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 and motor end, replacing of lugs if necessary for 1 module) LT module (54 Nos per Unit), 324 Nos for all the 3 units, (Critical modules in USS, BMCC, BVDC, TVDC, SBMCC & N/E SWGR).

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 6.6KV 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 operation mechanically and checking of IR value for 1 no. breaker. Unit-I, II and III (Station & Unit Switchgear)

II. Unit - I, II & III – HT & LT Switchgear – (2) Annual overhauling & Maintenance of HT/LT Switchgear and all its bus duct . Charges for 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. I. 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 ducts)

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 bus duct & C3A-U3A tie 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 (C1B-U1B , C2B-U2B link bus duct & C3B-U3B tie bus duct)

Charges for dismantling and assembling of all the inspection covers, checking tightness & healthiness of supporting insulators and internal cleaning of 15.75 KV bus duct of GT (15.75 KV ’R’ ‘Y’ ‘B’ bus duct of GT-I, II & III )

Cleaning of Excitation Transformer & its cooling fan & its ducts (06 Nos) (Cleaning of Excitation transformer and its cooling fan and its duct) of Unit I, II & III

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. (U1A, U2A & U3A 6.6KV Switchgear panels)

Charges for cleaning and lubricating of all moving parts of HT breakers, upper and lower pole arms, vaccum 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 . (U1B, U2B & U3B 6.6KV Switchgear panels)

Charges for Inspection & cleaning of Bus PT cubicle, SP cubicle and checking tightness of Bus PT & SP (Bus PT cubicle (LAVT cubicle) of Unit I, II & III

2. LT SWITCHGEAR Cleaning of all the modules, cleaning & healthiness checking of power contactor tips and replacing if necessary, terminal tightness of all components, checking & cleaning of finger contacts in breaker with IPA, healthiness of spring charging motors and the mechanisms, terminal tightness of all components of breakers and checking their operations. (USS 1A, 2A & 3A SWGR)

Cleaning of all the modules, cleaning & healthiness checking of power contactor tips and replacing if necessary, terminal tightness of all components, checking & cleaning of finger contacts in breaker with IPA, healthiness of spring charging motors and the mechanisms, terminal tightness of all components of breakers and checking their operations. (USS 1B, 2B & 3B SWGR)

Cleaning of all the modules, cleaning & healthiness checking of power contactor tips and replacing if necessary, termination tightness of all components, cleaning the breakers with IPA, healthiness of spring charging motor , termination tightness of all components and checking breaker operations and refixing the modules and breakers in the respective panels. (BMCC 1A, 1B, 2A, 2B, 3A & 3B SWGR)

Cleaning of all the modules with IPA, Cleaning & healthiness checking of power contactor tips and replacing if necessary, terminal tightness of all components, and refixing the modules in the respective panels. (SBMCC – 1,2 & 3 SWGR)

Cleaning of all the modules, cleaning & healthiness checking of power contactor tips and replacing if necessary, termination tightness of all components, checking & cleaning the Isolator switches. (N/E SWGR) of Unit I, II & III

Cleaning of all the modules, Cleaning & healthiness checking of power contactor tips and replacing if necessary, termination tightness of all components, cleaning the sliding contacts with IPA and refixing the modules in the respective panels. (BVDC & TVDC(VMCC) SWGRs) of Unit I, II & III.

3) 6.6KV ST-1, 2 & 3 Charges for releasing and Re-fixing 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 In-comer & tie bus ducts of C1, C2 & C3 Bus. (C1 A & B incomer & Tie bus duct) (ST- I to C1A) (ST- I to C1B) (ST- 2 to C2A) (ST- 2 to C2B) (ST3 to C3A) & (ST3 to C3B) C2 A & B incomer & Tie bus duct) (C3 A & B incomer & Tie bus duct)

Charges for cleaning and lubricating of all moving parts of HT breaker upper and lower pole arms, vaccum bottles with Acetone / IPA. All bolts and nuts tightness checking, checking healthiness of Interrupters closing / Tripping operations mechanically and checking of IR value for 3 No. panel. (C1A & C1B, C2A, C2B, C3A & C3B SWGR)

Complete overhauling of LT station Bus (SSSG) for SWGR. 1)Releasing the Top covers and side covers of the bus chamber, checking IR value and releasing out all the modules (156 Nos). (for 2 No. SSSG LT bus) SSS A & SSS B

T&P and Consumables

A.R.C.ENGINEERING (BID ID -1243582)