Life tester for alternating-current contactor and control method thereof

Abstract

The invention relates to a life tester for an alternating-current contactor and a control method thereof. The life tester consists of a test control cabinet, a specimen cabinet, a 1 / 6Ue power supply cabinet and a load cabinet, wherein the test control cabinet comprises an industrial personal computer, a driving circuit and a contact state detection circuit; the specimen cabinet comprises a first accompanied specimen, a contactor specimen and a first breaker; the 1 / 6Ue power supply cabinet comprises a second accompanied specimen and a second breaker; and the load cabinet comprises a load circuit. The life tester is controlled by the industrial personal computer, so a life test of the alternating-current contactor can be completed automatically and accurately, and the automation level of the life test is improved; and four electrical life tests of a switch-on test, a break-off test, a dead load test and a variable load test of the alternating-current contactor can be performed, and a mechanical life test of the alternating-current contactor also can be performed. The life tester has an integral data protection function, namely test data is not lost in case of unexpected outage, the collected test data is not damaged after the power supply restores, and the test data is saved perpetually.

Description

Technical field: [0001] The invention belongs to a test device in the field of low-voltage electrical appliances, in particular to a test device and a control method for the electric life and mechanical life of an AC contactor. Background technique: [0002] AC contactor is an electrical appliance used to frequently switch on and off the main circuit or large-capacity control circuit, and is widely used in electric transmission systems and automatic control systems. The electromagnetic system of the contactor can use a small excitation current to control the connection and breaking of the main contacts connected in series with the large current circuit, thus realizing the power amplification of the control circuit and the long-distance automatic control of the operation of the main circuit equipment. Since the contactor is required to operate at a high frequency in the control system, such as 300, 600, or even up to 3000 times per hour, in order to ensure a certain service l...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is: mainly aiming at the problem that the current AC contactor 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, the present invention provides a method to complete the life of the AC contactor. The test device is based on an industrial control computer and has a high degree of automation. It uses a solid-state relay to control the coil circuit of the test product and its accompanying test product. It has high reliability and long life. It uses current transformers of different ranges to realize Accurate sampling of current in the range of 0-750A

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