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

An automatic test system and variable frequency motor technology, applied in motor generator testing, testing dielectric strength, measuring electricity and other directions, can solve problems such as low degree of automation, complex testing operations, and inability to perform automatic testing, to extend service life, Ensure safety, efficient and fast testing process

Inactive Publication Date: 2016-08-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Experimental program
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Embodiment

[0032] Such as figure 1 As shown, the automatic test system for the phase-to-phase and phase-to-ground insulation PDIV of variable frequency motors, including

[0033] Control module: including FPGA chip and AD conversion module;

[0034] The AD conversion module is used to convert analog signals into digital signals. The AD acquisition card used in this embodiment has 12-bit AD conversion accuracy and a sampling rate of 200 MHz;

[0035] The FPGA chip is mainly used to control the data collection of the AD conversion module, and judge whether PDIV is generated according to the size of the partial discharge signal; communicate with the upper computer, display the corresponding parameters, and perform corresponding operations according to the input of the upper computer; according to the logic of the test Control the conduction of the corresponding high-voltage switch group; realize over-voltage protection according to whether the voltage exceeds the threshold and whether a partial di...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/34G01R1/36
CPCG01R31/1227G01R1/36G01R31/34
Inventor 王鹏王科镜王剑徐洪英李金泉
Owner SICHUAN UNIV
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