Large synchronous phase modifier rotor one-point grounding protection method

Abstract

The invention discloses a large synchronous phase modifier rotor one-point grounding protection method. The one-point grounding protection method is for a large synchronous phase modifier excitation system. The large synchronous phase modifier excitation system comprises an excitation transformer secondary side, a synchronous transformer primary side, a rectifier and a rotor winding, wherein the excitation transformer secondary side outputs a three-phase voltage to a rectifier bridge, the rectifier bridge rectifies the alternating current into the direct current and then supplies power to therotor winding, and the synchronous transformer primary side is used for detecting a zero crossing point of a power supply; when a rotor one-point grounding fault occurs, a resistance value of a faultgrounding resistor is smaller than a sensitive constant value, and a rotor one-point grounding sensitive section gives an alarm when the rotor one-point grounding sensitive section is put into use. The method is advantaged in that a problem of unstable grounding can be accurately diagnosed, and the situation that the fault is not removed in time due to an unstable grounding fault is avoided.

Description

technical field [0001] The invention belongs to the technical field of synchronous condenser control, and relates to the relay protection of a synchronous condenser, in particular to a logic action method for one-point grounding protection of a rotor of a large synchronous condenser. Background technique [0002] With the large-scale construction of long-distance DC transmission grid, its voltage level and transmission capacity continue to increase, and the capacity demand for reactive power compensation in converter stations is also increasing, especially dynamic reactive power compensation is important for the voltage stability of DC transmission system plays a very important role. The condenser has the characteristics of higher reliability, larger capacity, and strong ability to maintain voltage dynamically. In the case of grid disturbance, it can provide large-capacity dynamic reactive power in time through strong excitation. Therefore, in order to ensure the safety, re...

AI Technical Summary

Problems solved by technology

In the prior art, the one-point grounding protection of the rotor of the large-scale synchronous condenser cannot accurately diagnose the problem of unstable grounding, resulting in failure to remove the fault in time

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