Judgment method for insulation thermal mechanical degradation of VPI bar of pumped storage generator motor

Abstract

The invention relates to the technical field of bar insulation thermal mechanical degradation judgment, in particular to a judgment method for insulation thermal mechanical degradation of a VPI bar of a pumped storage generator motor. The method comprises the following steps of: periodically carrying out a cold and hot cycle test on the bar, carrying out an insulation dielectric loss factor test and result interpretation before and after each cycle, and acquiring corresponding data; if the interpretation result is that the data are qualified, carrying out the cold and hot cycle test; and if the interpretation result is that the data is unqualified, beating the bar by using a copper hammer, and performing signal processing by using a sound acquisition and analysis system to determine the spectrum characteristics in a thermal mechanical degradation state as a degradation criterion. According to the judgment method, a corresponding relation is established between the electrical features of the insulation thermal mechanical degradation of the pumped storage generator motor and the acoustic features of a copper hammer knocking method, and the judgment method is suitable for evaluating the thermal mechanical degradation state of a stator bar and a winding of the pumped storage generator motor as well as stator and rotor windings and bar insulation of a variable-speed pumped storage generator motor, and the thermal mechanical degradation state of insulation can be effectively detected.

Description

technical field [0001] The invention relates to the technical field of thermomechanical degradation judgment of wire rod insulation, in particular to a method for judging thermomechanical degradation of VPI wire rod insulation of a pumped storage power generation motor. Background technique [0002] At present, my country is in a critical period of energy green and low-carbon transformation and development. The large-scale and high-quality development of new energy such as wind power and photovoltaic power generation requires more urgent power regulation; The adjustable power supply with the most significant row efficiency, the best economy and the most large-scale development will usher in a stage of great development. [0003] Different from conventional hydro-generator sets that provide basic power loads, the main functions of pumped storage generator motors include power grid peak-shaving functions and valley-filling functions, so the units need to be started and stopped ...

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