Miniature circuit breaker electric endurance testing system and method

Abstract

The invention relates to a miniature circuit breaker electric endurance testing system and method. The miniature circuit breaker electric endurance testing system mainly comprises an alternating-current output power source, a direct-current output power source, an alternating-current load, a direct-current load, a voltage and current sensor and an industrial personal computer, wherein the industrial personal computer can send commands to the alternating-current power source, the direct-current power source, the alternating-current load and the direct-current load through buses; the alternating-current power source and the direct-current power source can automatically set output voltage of a main circuit to a miniature circuit breaker according to the commands; the alternating-current load and the direct-current load can be automatically matched with circuit impedance to determine testing main circuit current required by testing the miniature circuit breaker; the industrial personal computer sends a command to a motor driving device to control a manipulator of the motor to circularly switch on and off the tested miniature circuit breaker; the voltage sensor can collect voltage between a movable contact and a fixed contact of the miniature circuit breaker and send the voltage to the industrial personal computer to be analyzed and processed; thus, automatic testing of breaker electric endurance is achieved. The testing method is convenient, further improves reliability and accuracy for judging testing results, greatly improves work efficiency and reduces labor cost.

Description

technical field [0001] The invention relates to a system and a method for testing the electric life of a miniature circuit breaker. Background technique [0002] The miniature circuit breaker is the most widely used terminal protection device in various electrical terminal power distribution devices, and its application is large and wide. If the reliability of the miniature circuit breaker is not good, the loss caused by it is huge, so it is very necessary to test the electrical life of the miniature circuit breaker. Some national certification bodies in China have corresponding test platforms, such as Shanghai Electrical Appliance Science Research Institute, Guangzhou Electrical Appliance Science Research Institute, etc., which were invested by the state in the early stage. The equipment is relatively backward, huge in size, and low in automation. [0003] The electrical life of a miniature circuit breaker refers to the number of on-load operations that electrical applianc...

AI Technical Summary

Problems solved by technology

The traditional scheme test method judges whether the high and low levels of the dynamic and static contacts of the miniature circuit breaker are turned on and off as the basis for whether the electrical life is qualified. It can only judge the situation that the miniature circuit breaker cannot be closed and disconnected normally. Intermittent arcing, the contact resistance increases and the failure will not be captured; Generally, the impact transformer is used as the output power supply, which is huge in size, low in voltage regulation fineness, requires manual setting, and has poor safety; the entire test system has a low degree of automation, The cylinder is used as the driving device, the noise is large during the test, and the test environment is relatively harsh

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