Low voltage breaker life automatic test apparatus

Abstract

The invention provides a low voltage breaker life automatic test apparatus. The apparatus is composed of a test control cabinet, a specimen cabinet and a load cabinet, wherein the test control cabinet comprise an industrial control computer, a drive circuit and a contact state detection circuit, the specimen cabinet comprises an AC contactor, a specimen and a breaker, and the load cabinet comprises a load circuit. The industrial control computer is formed by a display, a computer host and a keyboard, and connects with the drive circuit and the contact state detection circuit respectively. Thedrive circuit connects with the AC contactor, the specimen and the breaker respectively. The AC contactor connects with the breaker and the specimen respectively. The specimen connects with the contact state detection circuit and the load circuit respectively. According to the invention, voltage current waveforms in connection and disconnection processes of the breaker can be detected in real time, automation degree is high, by employing a current transformer, different variable ratio designs can be selected with different gears, and current accuracy sampling in a scope of 0-3000A can be realized.

Description

Technical field: [0001] The invention belongs to a test device in the field of low-voltage electrical appliances, and particularly relates to an automatic test technology and test device for the mechanical and electrical life of low-voltage circuit breakers (including miniature circuit breakers and molded case circuit breakers). The device can automatically complete the mechanical life test and electrical life test of the low-voltage circuit breaker, and can monitor the test voltage and current waveforms in real time during the test, realize automatic fault diagnosis of the circuit breaker, and record fault information. Background technique: [0002] Low-voltage circuit breakers are important equipment in low-voltage electrical appliances. They belong to protective electrical appliances. They are used in low-voltage distribution circuits, motors or other electrical equipment, and are responsible for connecting, carrying and breaking normal conditions or abnormal conditions (such a...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is: mainly aiming at the problem that the current low-voltage circuit breaker life test technology does not involve the mechanical life test and the waveform of the voltage and current cannot be detected in real time during the electrical life test, to provide an automatic low-voltage circuit breaker life test. The device uses a solid state relay with a double-acting cylinder and an executive handle to control the closing and opening of the test product (low-voltage circuit breaker). The solid state relay has short response time, high reliability, and long life. Ratio design, which can realize accurate sampling of current in the range of 0-3000A

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