Synchronous generator rotor dynamic turn-to-turn short circuit fault detection system and method

Abstract

The invention discloses a synchronous generator rotor dynamic turn-to-turn short circuit fault detection system and method. The system comprises a motor, a synchronous generator, a current transformer, an acquisition card, an infrared temperature sensor, a temperature acquisition instrument and a control terminal. Based on the fact that the infrared temperature sensor can sensitively acquire the temperature of a rotor winding and perform non-contact measurement and the rotor winding has an obvious temperature rise phenomenon during a dynamic turn-to-turn short circuit, a dynamic turn-to-turn short circuit fault of the rotor winding of the synchronous generator is detected through double judgment standards of the actually measured temperature signal of the rotor winding and the three-phase current signal of a stator winding, and fault positioning is carried out. The method is easy to operate and high in sensitivity, the fault detection and positioning process is efficient and reliable, and a dynamic turn-to-turn short circuit fault can be detected in the early stage of rotor static turn-to-turn short circuit formation, so that the fault shutdown loss of a power plant is reduced, and the actual application requirement can be better met.

Description

technical field [0001] The invention relates to the technical field of equipment state monitoring and testing, and more specifically relates to a dynamic inter-turn short-circuit fault detection system and method for a synchronous generator rotor. Background technique [0002] At present, the inter-turn short-circuit fault of the rotor is a relatively common fault in the operation of the generator. When the short-circuit fault between the rotor turns occurs, the terminal voltage of the generator decreases due to insufficient excitation. If the measures are taken, the reactive power will also increase accordingly; when the fault occurs to a certain extent, the journal and bearing bush may be burned, and there is a risk of magnetizing the large shaft, which may even cause the generator to fail to ground and stop, which will affect the stability of the power grid and the operation of the power plant. bring about adverse effects. [0003] Rotor inter-turn short circuit is furth...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a dynamic inter-turn short-circuit fault detection system and method for a synchronous generator rotor, which identifies and locates the dynamic inter-turn short-circuit fault of the synchronous generator rotor winding through the stator three-phase current signal and the rotor temperature signal, and effectively solves the problem. The detection efficiency and reliability of existing methods are difficult to meet the needs of practical applications

Images