NCTPS I ES Circle EM I Dn S Dn II Time bound works for maintenance Overhauling of important critical modules and HT LT breakers in unit I II III switchgear for the period of 180 days

Amount

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 cables tightness at module end and motor end, replacing of lugs if necessary for 1 module) LT module (54 Nos. per Unit), 162 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 50Breakers Unit-II 50 Breakers Unit-III 36 Breakers

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

SRI TIRUMALA ENGINEERING WORKS