Single-phase programmable current source device and control method thereof

Abstract

The invention discloses a single-phase programmable current source device and a control method thereof. Voltage of a power grid sequentially passes through a circuit breaker, a three-phase input reactor and a three-phase alternating current contactor and then is accessed into a rectifying unit, the rectified voltage is accessed into a three-phase inverter assembly, a double-DSP (digital signal processor) control unit is used for receiving the current waveform parameters sent by a touch display screen or a remote monitoring platform, and adopts a continuous output method, the double-DSP control unit is also used for generating instruction current to drive three groups of inverter assemblies to generate current waveform, the inverter assemblies are used for outputting Hall detection signals and current transformer detection signals and feeding back into DSP controllers, and the input parameters of a current source generation unit are corrected. The single-phase programmable current source device has the advantages that the digital and intelligent functions are realized, and the single-phase programmable current source device is used for performing heat tolerance test on the devices, such as low-voltage switches, circuit breakers, alternating current contactors and fuses.

Description

technical field [0001] The invention relates to a single-phase programmable current source device and a control method thereof, which provide a current source for the thermal endurance test of low-voltage switches, circuit breakers, AC contactors, fuses and other devices. Background technique [0002] In order to conduct various immunity tests on circuit breakers and other devices, the current source equipment for the test needs to be carried out at rated frequency and rated current. The power supply generally includes a power supply based on a saturated iron core, a thyristor rectifier power supply, and a programmable power supply. . [0003] The equipment using the saturated iron core principle is not only large in size, low in precision, but also inflexible in operation, slow in response, and large in error. It is difficult to accurately test the conditions required by the laboratory for thermal tripping or electromagnetic tripping of switchgear. [0004] Thyristors conn...

AI Technical Summary

Problems solved by technology

However, there are still shortcomings such as high equipment failure rate, inability to freely set the required harmonic current, difficulty in adding functions, and serious harmonic pollution.

[0005] Although the programmable power supply currently on the market has small size, convenient operation, free setting of the required detection current, low loss, low harmonic pollution, and multiple harmonic output functions, the output current is generally at the ampere level. Applied to small current testing, it cannot meet the inspection capacity requirements of high-power industrial equipment

At the same time, periodic current sag and interruption tests cannot be realized

[0006] To sum up, the equipment and instruments used for the endurance test of low-voltage switching devices according to the known technology cannot meet the requirements of the test, and there is no corresponding equipment on the market

For the thermal endurance test of high-power switching devices, it cannot be detected normally

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