Method for monitoring turn-to-turn short circuit of generator by impedance spectrum

Abstract

The invention relates to a method for monitoring a turn-to-turn short circuit of a generator by an impedance spectrum. The method comprises the following steps of 1, acquiring generator end current, coupling capacitance current in a closed bus of the generator and injection signal generator end voltage-to-ground; 2, inputting the acquired generator end current, the coupling capacitance current inthe closed bus of the generator and the injection signal generator end voltage-to-ground data to a parameter-adjustable generator low-frequency-high-frequency winding impedance parameter model to obtain the impedance spectrum during normal running and the turn-to-turn short circuit of the generator; and 3, drawing a spectrum-impedance winding coupling curve based on the impedance spectrum during the normal running and the turn-to-turn short circuit of the generator, and monitoring a turn-to-turn short circuit fault of a generator stator by the spectrum-impedance winding coupling curve. By themethod, the running reliability and the availability of the generator can be improved, and the turn-to-turn insulation monitoring of different insulation mediums is achieved by evaluating the insulation fault of the generator stator medium.

Description

technical field [0001] The invention belongs to the technical field of inter-turn short-circuit monitoring of generators, and in particular relates to a method for monitoring inter-turn short-circuit of a generator by impedance spectrum. Background technique [0002] In industry, AC motors are widely used in water pumps, fans, machine tools, compressors and other fields. In recent years, with the promotion of new energy sources, AC motors have also played an increasingly important role in applications such as wind power generation and electric vehicles. effect. During the operation of a large generator, its windings are bound to be affected by various factors such as electromagnetic field, temperature field, mechanical stress and surrounding humid environment. If the generator is operated in this state for a long time, it is easy to cause winding insulation damage, and once the winding insulation is damaged, it will cause inter-turn short circuit faults in the winding. And...

AI Technical Summary

Problems solved by technology

This method needs to calibrate the asymmetry degree of the resistor network in advance, which not only increases the engineering complexity, but also reduces the reliability of the system.

[0009] (5) Back electromotive force method: Since the fault characteristics of the closed-loop motor system are distributed in the voltage and current signals at the same time, it is impossible to obtain comprehensive fault information by measuring a certain type of signal alone

The pre-training of the artificial intelligence method is time-consuming, and it needs to provide measured data under various conditions such as normal and fault at the same time, so there are still many inconveniences in the actual engineering application process

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