Power required for avoiding the damage to the equipment in case of power failure is called survival power. Consider a total grid collapse, which results in tripping both offsite power (electrical power coming from the grid to the thermal power plant) and onsite power (power generated by the thermal power plant). During this emergency condition some electrical power is required to operate certain pumps and other auxiliaries to keep the major equipment in the thermal power plant in safe condition
Some of the auxiliaries which require power during emergencies in thermal power plant are:
- Turbine emergency lube oil pump: This is battery driven centrifugal oil pump designed to operate at 40% of required oil to turbine and ensures the turbine coast down smoothly
- Lubricating oil pumps
- Compressors for Air blast circuit breakers
- Emergency lighting
- Control room controls
- Communication and telemetry equipment in the power plant
These emergency auxiliaries operate when power black out occurs and protect the major equipment of the plant. This load will be supplied by battery banks in thermal power plant. This is the major reason why battery banks are provided in thermal power plants. This load will be around 0.25% to 0.3% of the total unit capacity.
1 comment:
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