System and method for automatically testing interphase and phase-to-ground insulation PDIV of variable frequency motor

Abstract

The invention discloses an automatic test system and method for interphase and phase-to-ground insulation PDIV of frequency-variable motors, including a control module, a frequency-variable power supply, a high-voltage probe, a high-voltage switch assembly, a signal conditioning circuit, a host computer, and an output The sensor connected to the signal conditioning circuit, the transformer connected to the output end of the variable frequency power supply, and the variable frequency motor connected to the output end of the transformer through the high voltage switch assembly; the input end of the high voltage probe is connected to the output end of the transformer; the One end of the high-voltage switch assembly is connected to the output end of the transformer, and the other end is connected to the grounding casing and three-phase winding of the variable frequency motor at the same time. The present invention realizes the test of PDIV between all insulations by controlling the opening and closing states of each high-voltage switch. Sudden insulation breakdown accidents occur and prolong the service life of the motor.

Description

Technical field [0001] The invention relates to a test system and method for a variable frequency motor PDIV, in particular to an automatic test system and method for the phase-to-phase and phase-to-ground insulation PDIV of a variable frequency motor. Background technique [0002] Frequency conversion motors are widely used in various fields due to their good speed regulation performance, easy start-up, and energy saving, and have a tendency to gradually replace DC speed regulation motors. However, due to the impact of the inverter's high frequency and short rise time pulse voltage, partial discharge is prone to occur inside the inverter motor insulation, which greatly shortens the service life of the motor, and a large number of early failures of the inverter motor insulation. [0003] Studies have shown that partial discharge caused by overvoltage at the end of the motor is the main cause of insulation damage to the inverter motor. In this regard, in order to avoid the early fa...

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Problems solved by technology

[0004] Most of the existing frequency conversion motor PDIV tests rely on manual testing, the test operation is complicated, and the degree of automation is not high

Sichuan University's patent No. 201520279769.1 is an automatic test system for variable frequency motor PDIV applied to power frequency. Although the automatic test of variable frequency motor PDIV is realized, the system can only test the inter-turn insulation of the motor, and cannot test the motor with a complex structure. Automatically test the phase-to-phase, phase-to-ground insulation of the complete motor

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