Generator protection element

摘要

The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic.

主权项

1. A system, comprising:
a steam turbine; a generator coupled to the steam turbine and configured to generate electrical energy from mechanical energy provided by the steam turbine, and the generator in electrical communication with an electric power generation and transmission system; an intelligent electronic device (IED), comprising:
a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator;an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic, the tripping characteristic being defined by a function having a first slope above a real power axis and a second slope below the real power axis, the first slope and the second slope being equal and opposite, and the measured imaginary power output of the generator;a time subsystem configured to determine a length of time during which the tripping characteristic is satisfied; anda tripping subsystem configured to issue a trip command based upon satisfaction of the tripping characteristic for the length of time and a motoring condition;an electrical interrupter configured to selectively interrupt an electrical connection between the generator and the electric power generation and transmission system based on the trip command.