Generator-rotor inter-turn short circuit diagnosis device based on excitation step method and method thereof

Abstract

The invention discloses a generator-rotor inter-turn short circuit diagnosis device based on excitation step method. The device comprises a direct current constant voltage source and data acquisition analyzers. The direct current constant voltage source is connected to an excitation winding through a first program control switch. A sampling resistor is connected in series to the excitation winding. The data acquisition analyzers are connected in parallel to two ends of the sampling resistor. The data acquisition analyzers determine whether a motor rotor winding generates an inter-turn short circuit through collecting an excitation current of the rotor winding. Two ends of the excitation winding are connected in parallel to a de-excitation resistor through a second program control switch. By using the device and the method of the invention, disadvantages in the prior art can be overcome, and an off-line diagnosis level of a turbonator rotor winding inter-turn short circuit fault is improved.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a device and method for diagnosing a short circuit between turns of a generator rotor based on an excitation step method. Background technique [0002] Turn-to-turn short circuit of rotor winding is one of the most common forms of electrical faults in turbogenerators. A slight turn-to-turn short-circuit fault unit can still continue to operate. Once the fault worsens, it will lead to one-point grounding and two-point grounding faults of the rotor, which will force the power generation company to stop for maintenance and cause huge economic losses. Therefore, it is very necessary to monitor and diagnose the short-circuit fault of the rotor winding of the turbogenerator. Effective monitoring and diagnosis methods can detect minor short-circuit faults in time, avoid fault deterioration and expansion, and quickly confirm the fault location can also reduce unit downtime , to reduc...

AI Technical Summary

Problems solved by technology

Among these off-line detection methods, some detection methods have low sensitivity, such as no-load test method, short-circuit test method, DC resistance measurement method, and some methods need to extract the generator rotor to carry out, such as rotor winding voltage distribution test method, open transformer test method, etc. Law etc.

Images