1.0 OBJECTIVE:To lay down procedure for operation after M.S.E.B. power failure.
2.0 SCOPE:This SOP shall be applicable for electrical power system of the plant.
3.0 RESPONSIBILITY:Technician / Engineer / Executive
5.0 PROCEDURE:5.1 APFC panel in Utility block will switch off automatically.
5.2 Ensure that air circuit breakers of transformer 1 and 2 are tripped.
5.3 For Auto changeover
5.3.1 D.G. set will start automatically after power failure.
5.3.2 Check voltages between R-Y, Y-B and B-R, it should be between 415 to 420 volts.
5.3.3 Check frequency of supply it should be between 49.5 to 50.0 Hz.
5.3.4 Close the D.G. incomer breaker and breakers of bus coupler 1 and 2 manually by releasing the emergency switch and turning the selector switch to auto mode.
5.4 For manual changeover
5.4.1 Start the D.G. set as per the procedure for operation of D.G. set.
5.4.2 Check voltages between R-Y, Y-B and B-R, it should be between 415 to 420 volts.
5.4.3 Check frequency of supply it should be between 49.5 to 50.0 Hz.
5.4.4 Close the D.G. incomer breaker in D. G. room.
5.4.5 Ensure transformer incomer – 1 and transformer incomer – 2 on L. T. panel must be in open condition.
5.4.6 Close the breaker of D.G. incomer, bus coupler –1 and bus coupler -2 on L. T. panel.
5.4.7 The load in Amps on D. G. set now starts increasing, monitor it.
5.5 If load exceeds 850Amps, start additional D. G. set manually which gets synchronized with other D. G. set.
5.6 The load on D. G. sets will be shared equally.
5.7 Monitor and record parameters in D. G. set monitoring record.
5.8 After resumption of D.G. power, ensure utility PMCC, PCC-MFG, Sub PCC 1 & 2 and MLDB are operational.
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