Rotating diode detection system and method for brushless excitation generator set

Abstract

The invention discloses a brushless excitation-type generator set rotation diode detection system. The system comprises a large shaft gap detection coil, a first current induction detection coil, a second current induction detection coil and a state detection module. The large shaft gap detection coil, the first current induction detection coil and the second current induction detection coil are arranged in a periphery of a static part of a generator set respectively. The state detection module is used for detecting whether a rotation diode branch has a fault according to induction signals of the large shaft gap detection coil, the first current induction detection coil and the second current induction detection coil and carrying out alarm when the fault is discovered. The invention also discloses a brushless excitation-type generator set rotation diode detection method. In the invention, a sensor does not need to be additionally installed; through using a rotation rectification excitation type generator set, arrangement positions of the detection coils depend on a generator body structure; and positioning, alarm, fault and other development functions can be realized.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a detection system and method for a rotating diode of a brushless excitation type generating set. Background technique [0002] In the early days, most nuclear power and large thermal power units in China used brushless excitation. The rotating rectifier part is an indispensable part of the brushless excitation generator set. The quality of the rotating diode element is very important for the safe and stable operation of the generator set. However, the rotating diode element is in a high-speed rotating state when it is actually working normally, which is difficult to detect. [0003] At present, there are three main conventional detection methods for rotating diode components: indicator light frequency detection method, harmonic armature method and direct detection method. The indicator light frequency detection method requires the on-duty personnel to observe the state ...

AI Technical Summary

Problems solved by technology

The indicator light frequency detection method requires the on-duty personnel to observe the state of the fuse light-emitting tube equipped with each diode to determine the damage of the rotating diode, and the maintainability is low, so it is rarely used

According to the principle of harmonic armature reaction, the harmonic armature method compares the harmonic component generated in the excitation winding when the rotating diode element is faulty with the harmonic component when it is normal, so as to determine the damage of the diode, and cannot accurately locate the faulty rotating diode element , and it is not suitable for generating sets with too many branches or too many phases, and there are certain limitations

The disadvantage of the direct detection method is that sensors need to be installed, and it is related to the structure of the generator and the location of the sensors, and there are certain technical requirements for the installation and layout.

Images