A distributed withstand voltage test device for high-voltage capacitors

Abstract

The invention discloses a high-voltage capacitor distributed voltage withstanding testing device. The device includes a voltage withstanding test main circuit, a voltage withstanding test detection and control circuit and a drying oven, wherein the voltage withstanding test main circuit includes a plurality of independent control loops, each independent control loop includes a high-voltage module, a current relay and an intermediate relay normally closed contact which are connected in sequence; the voltage withstanding test detection and control circuit includes a current relay normally open contact, an extension input port, a single-chip microcomputer, an extension output port, an intermediate relay and a computer; the current relay normally open contact is connected with the extension input port, the intermediate relay is connected with the extension output port, the extension input port and the extension output port are in communication connection with the single-chip microcomputer, and the single-chip microcomputer is in communication connection with the computer. The high-voltage capacitor distributed voltage withstanding testing device is simple in system structure and high in degree of automation, a computer configuration software interface displays the state of the current relay and test duration, a measurement and control system is stable and reliable, and the device can make up for the current situation that no high-voltage capacitor distributed voltage withstanding testing device exists in China.

Description

Technical field [0001] The invention relates to a high-voltage capacitor distributed withstand voltage test device, which belongs to the technical fields of electromechanical integration, sensing and measurement and control. It is suitable for production industries such as high-voltage capacitors, high and low voltage inverters, and new energy equipment. Background technique [0002] High-voltage capacitors are inseparable in the production of industrial automation equipment, power supplies, transportation, new energy and other equipment. High-voltage capacitors usually refer to aluminum electrolytic capacitors with a working voltage greater than 250V DC and a capacity greater than 1000uF. High-voltage capacitor manufacturers must conduct a withstand voltage test on each high-voltage capacitor, use a constant current voltage source to conduct high-voltage power on the product, and place the product in an oven. Detect the leakage current of each high-voltage capacitor in the hig...

AI Technical Summary

Problems solved by technology

[0004] Domestic high-voltage capacitor withstand voltage test device, once a certain high-voltage capacitor cannot withstand such a continuous high voltage, the leakage current suddenly changes, and the high voltage drops significantly; the high-voltage capacitor withstand voltage test device automatically protects, automatically turns off the high-voltage generating device, and the entire withstand voltage test is interrupted

On the one hand, the time of the previous withstand voltage test is cleared, and on the other hand, it is difficult to find the failed capacitor, or even make a misjudgment (experienced operators carefully observe the appearance changes of capacitors, the increase in temperature, or the changes in the insulation resistance of the test. )

Images