Small-capacity contactor electrical endurance test system and method

Abstract

The invention discloses a small-capacity contactor electrical endurance test system. The small-capacity contactor electrical endurance test system comprises a control loop power supply, a primary loop power supply, a load, and an industrial control machine which is connected with the load, wherein the industrial control machine is connected with a voltage and current sensor and a driving circuit respectively; the driving circuit is connected with the control loop power supply; the voltage and current sensor is connected with the primary loop power supply; the primary loop power supply and the control loop power supply are connected with the industrial control machine respectively; a contactor is arranged on a test object mounting table; the contactor is connected with the voltage and current sensor, the driving circuit, the primary loop power supply and the load respectively; the test object mounting table is mainly integrated with all power supply outputs and an input interface of the load, and various corresponding sensors are integrated inside the test object mounting table. The test system has a high automation capability, an electrical endurance test is accurately judged through a plurality of redundant judgment methods, and the test accuracy and test result reliability are increased and improved.

Description

technical field [0001] The invention belongs to the technical field of electrical life testing systems for contactors, and relates to a small-capacity contactor electrical life testing system and method. Background technique [0002] The contactor is a highly versatile automatic switching device and an important low-voltage device in electric drive and automatic control systems. It can frequently switch on and off the AC and DC main circuits and large-capacity control circuits. Contactors are widely used, such as in high-speed trains. Statistical data show that among the causes of EMU failures, system failures due to aging electrical components and unreliable work account for a high proportion. The contactor is an important auxiliary device widely used in high-speed trains. Therefore, in-depth research on its electrical life is of great significance to the running stability and safety of high-speed trains. The contactor test is an important means to check the quality of t...

AI Technical Summary

Problems solved by technology

[0003] In terms of contactor life test technology, the traditional contactor electrical life test system is mainly composed of control switches, pulse signal generators, small-capacity relays, counters, loads, etc. Actions require manual operation, and the test operation process is cumbersome

The adjustment of the load also needs manual adjustment, and the test parameters such as the power factor and time constant of the load cannot be obtained directly

The traditional solution for electrical life testing of contactors also uses single-chip microcomputer integration technology or PLC technology to control data acquisition. This solution adopts a circular scanning method in data acquisition. When there are many programs that need to be scanned when there are problems in the main circuit, the main circuit cannot be protected in time

Using PLC boards for collection, the isolation is not sufficient, it is susceptible to external interference, it cannot be collected and transmitted immediately, and the amount of data is small, so it is not suitable for large amount of data processing and relatively complex application processing.

The existing contactor electrical life testing scheme involves a single processing task, and the calculation speed is slow, and none of them have been realized. During a period of time, the two ends of the main circuit and the two ends of the main contact of the contactor are measured during the pull-in and release process. Terminal voltage and current values, can not get the corresponding steady-state resistance value

There is only one method for judging the electrical life in the existing test methods, which cannot more accurately judge the failure of the contactor test product during the electrical life test

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