During a load rejection governor
During a load rejection governor
(OP)
During a load rejection governor automatically switch its operation mode to "Isolated Network" with a speed control mode, and start closing the Distributor.
The dynamic response of regulators speed is slower than the rate of increase of speed of generators s (Approximately 8% / s).
2 things happen:
1- Partial shutdown(86PS) by overspeed relay.
2- Total shutdown (86E)by Automatic Voltage Regulator for failure Excitation Second Stage
How to resolve this problem?





RE: During a load rejection governor
Mike L.
RE: During a load rejection governor
The excitation system should absolutely not trip on load rejection. Since these are likely static exciters, there shoud be almost NO change in stator voltage on a full load trip. The settings must be non-optimal, perhaps all-wrong...
rasevskii
RE: During a load rejection governor
governor and AVR are ABB.
RE: During a load rejection governor
During a load rejection, there is a violation of the absorption capacity of reactive power by the Estreito Hydro powerplant and consequent loss of control of the voltage set value.
The loss of both AVR channels causes a fault trip 86E.