REVERSE POWER FLOW AND REVERSE POWER RELAY


  • The flow of current back to the generator which is connected in parallel is called reverse power flow.
  • This may occur because of the failure of prime movers, at the time of paralleling and when generator is in off load.
  • The failed generator draws current from main bus bar (ie from other generator) and act as a motor is called motoring effect.
  • Motoring effect cause drawing of high power from circuit and cause damages to the crank shaft.
  • Reverse power relay monitors the direction of power flowing between generator and the load.
  • Reverse power relay detects the reverse power flow and trips the generator circuit breaker.
  • If the prime mover is a turbine the reverse power pick up setting of 2-3%
  • If the prime mover is diesel setting range of 5-15% is adopted.
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