OandM of Andhra Power House1

Amount

O&M of Andhra Power House

Repair and maintenance of the existing LT protection panel with an H-V (horizontal-vertical) connection to the transformer and bus bar, ensuring proper integration as per site conditions. This includes replacing the damaged metering, protection, and circuit breaker panel with a new system that aligns with current safety and operational standards. The installation will be carefully carried out to maintain the structural integrity of the existing setup while ensuring proper alignment and secure connections.

The replacement will include a withdrawable 3-pole circuit breaker, rated 630A to 500V, 50/60Hz AC, with an interruption capacity of 55kA at 500V, along with a microprocessor-based relay for overload, short-circuit (SC), and earth fault protection. The new setup will feature a mechanical lockout device, tripped signaling switch, tripped indicators, and a guide frame rated for short-time current strength (ICW 55kA/S). Additionally, it will incorporate an ETU47WT D&S LSING overcurrent release with display and aux Undervoltage release, a manual operating mechanism, and a door sealing frame for enhanced safety and functionality. The circuit breaker will be equipped with a motorized spring charging mechanism, operating on an auxiliary voltage of 220V-230V DC, ensuring smooth and reliable performance.

The retrofit will be executed with adjustments suitable to the site requirements, ensuring seamless integration with the existing bus bar and transformer connections. The new protection panel will conform to IEC 60947-2 standards and will be of the SENTRON 3WT air circuit breaker series, designed for durability with an electrical endurance of 10,000 switching cycles and a mechanical service life of 16,000 cycles. The system will maintain voltage ratings of 500V operational, 1,000V insulation, and 12kV surge resistance, with an IP20 protection class. This installation will enhance the panel’s reliability, ensuring a safe and efficient power distribution system.

Providing and fixing a Siemens 3TS4822-0AR0 contactor and an overload relay 3US5800-2F8K (range 32-50A) for Compressor A, along with the replacement of 63Amp offset fuses (gG type, TIS 63A) from a reputed make, 20 Nos. quantity including mandatory spares for the compressor panel. The job also includes the replacement of worn-out pulleys and V-belts (B2130, 4 nos.) for Compressors A & B, as well as the replacement of two compressor watch glasses. Additionally, a new puller will be provided for removing the pulley from a 42mm shaft, along with a 12x4mm key lock, ensuring the smooth operation of the installed compressor at Andhra Power House.

Installation of a TPN box for the Control Room auxiliary circuit (6-way) along with a 32A MCB and individual MCBs for different circuits for lighting and boards, including the complete installation of 12 no. 16A MCBs and three-phase surge protection in each phase along installation of distribution board at Andhra Power House, complete in all respects.

V.L. ELECTRICALS (BID ID -492826)

VINAY ENTERPRISES (BID ID -493009)

ANUSHREE ELECTRICAL ENGINEERS PRIVATE LIMITED (BID ID -492829)