SU442546A1 - Device for automatic detection of excitation loss of a synchronous generator - Google Patents

Description

A device is known for automatically determining the loss of excitation of a synchronous generator, which contains a phase-sensitive circuit, converts the current and voltage of the generator into a signal proportional to the reactive current of the generator, and a relay at the output of the phase-sensitive circuit. In order to improve the reliability of detecting the mode of excitation loss, the proposed device uses electromagnetic a relay with two windings connected to the output of a phase-and-junction circuit in a differential circuit with a midpoint, and an output phase sensor th circuit shunted diode. At the same time, in order to eliminate the vibration of the relay, the latter is additionally equipped with a short-circuited winding. The device is supplied with voltage (to intermediate voltage transformer l) and I current (to intermediate current transformer 2) of the stator of the generator of a certain combination of phases: :: 1 d. And Ug, or D and j High voltage Uao and l / gfl output. the phase-sensitive circuit 3 is proportional to the geometric sum of the difference between the voltage and current vectors supplied to the device, i.e., iooo 1st + kU1 - / cJ /, where K is the coefficient of proportionality between; current of the generator stator and voltage across the resistor 4. With the generator taking care in the inductive circuit / (/ C –L J /. The potentials of the points a and o in these modes are equalized by diode 5, therefore the actuator 6 does not work. capacitive shdrante (the probing of reactive energy) / uf J / / l; / - and} / UQO Diode 5 in this case is closed.