Overload characteristic test bed of intelligent circuit breaker and control method of overload characteristic test bed

Abstract

The invention relates to an overload characteristic test bed of an intelligent circuit breaker and a control method of the overload characteristic test bed. The overload characteristic test bed is characterized by comprising an industrial control computer, an industrial touch display screen and a current stabilized power supply, wherein the industrial control computer is connected with the industrial touch display screen; and the current stabilized power supply comprises a relay control unit, a contactor control unit, a signal processing power supply, a motor forward / reverse rotation loop, anauto-transformer, a mutual-coupled transformer and a primary tap combined circuit on the primary side. The current stabilized power supply has two-stage automatic voltage regulation and one-stage manual voltage regulation functions, and can meet the use requirements of circuit breakers with different impedances. The AC (alternated current) output range of the current stabilized power supply is 10to 1000 A, and the ratio of the maximal output to the minimal output is 100. The test bed has three current output shifts with different ranges by adopting the industrial control computer to control the tap combination of the primary coil of the transformer, so that the test bed has the advantages of high current stabilization speed and high measurement accuracy; and the unique current stabilization process has less impact on the contact of the circuit breaker.

Description

technical field [0001] The invention belongs to a low-voltage electrical appliance test bench, in particular to an intelligent circuit breaker overload characteristic test bench and a control method thereof. Background technique [0002] Low-voltage electrical appliances are the basic components of the mechanical industry, and the performance and quality of their products directly affect the reliable operation of power systems and industrial control systems. According to national standards and IEC standards, low-voltage circuit breakers must undergo tests including overload long-delay tripping characteristics before leaving the factory. According to this market demand, a batch of circuit breaker tripping characteristic test benches with constant current output function emerged on the market, with high degree of automation and reliable quality, which greatly improved the test efficiency. The main technical parameters include: output current range: AC 100-1000 A; current accu...

AI Technical Summary

Problems solved by technology

The main technical parameters include: output current range: AC 100-1000 A; current accuracy: ±5%; it can be seen that the output current range of the test bench is small: the maximum value is only ten times the minimum value, and the frame current is less than 100A. The circuit breaker cannot be tested, mainly because the lower the output voltage of the transformer can meet the maximum output of 1000A current output of the test bench, and the high contact resistance of the miniature circuit breaker requires a high output voltage of the transformer, the two are contradictory, so most of the tests The output current range of the set cannot be too wide; and the current accuracy is low, which is increasingly unable to meet the current accuracy requirements of most intelligent circuit breakers on the market.

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