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Device for testing electric pulse strength for insulation

A test device and technology of electric strength, applied in the direction of measuring device, testing dielectric strength, measuring electricity, etc., can solve the problems of difficulty in developing square wave generator with high repetition rate of voltage and so on

Inactive Publication Date: 2008-01-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of domestic high-voltage IGBT or MOSFET devices and the influence of device capacitance and circuit inductance, it is very difficult to develop a square wave generator with high-speed rise in voltage and high repetition rate.

Method used

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  • Device for testing electric pulse strength for insulation
  • Device for testing electric pulse strength for insulation
  • Device for testing electric pulse strength for insulation

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Experimental program
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Embodiment Construction

[0029] The insulation pulse withstand voltage test device of the present invention mainly includes an adjustable DC power supply, a drive circuit, a ±1600V, 25ns pulse generator, a sample, a protection, and a timing circuit, and each circuit is introduced in detail below.

[0030] Referring to Figure 1, the adjustable DC power supply is used to provide the variable DC voltage required in the circuit; the circuit includes a rectifying and filtering circuit composed of rectifying diodes D1-D6 and capacitor C0, high-frequency transformers T1, T2, T3 and switching tubes Half-bridge switching power supply composed of QM1, QM2 and capacitors C1 and C2, manual switch S1, and contactor ZK, "close" and "open" buttons;

[0031] The output end of the filter circuit is connected to a bridge composed of series switch tubes QM1, QM2 and capacitors C1, C2. After the high-frequency transformers T1, T2, and T3 are connected in parallel, one end of the secondary side is connected between capacit...

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Abstract

The present invention discloses an insulated pulse electric strength testing device. Said device mainly is formed from four portions of adjustable DC power supply, drive circuit, plus or minus 1600V and 25ns pulse generator and sample, protection and timing circuit. Said device can be used for measuring insulated electric strength of enamelled wire or between turns of winding of adjustable frequency motor. Besides, said invention also provides the concrete steps of said testing method.

Description

technical field [0001] The invention relates to a test device, in particular to an insulation pulse electric strength testing device for measuring the electric strength of enameled wire for variable frequency motors or inter-turn insulation of variable frequency motor coils. The ability of inter-insulation to withstand pulse voltage, measure the life of insulation under the action of PWM pulse voltage, and evaluate the quality of enameled wire insulation and coil inter-turn insulation of variable frequency motors. Background technique [0002] With the automation of industrial production, the modernization of vehicles and the high efficiency of household appliances, the use of variable frequency motors is becoming more and more widespread. After the pulse width modulation (PWM) voltage replaces the traditional sine wave, the insulation life of variable frequency motors is greatly shortened. The steep waveform of the pulse is the main cause of insulation damage. The damage me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/00
Inventor 屠德民王霞
Owner XI AN JIAOTONG UNIV