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| Design of a controlled switching device with high precision |
| Dong Zhenliang |
| China Coal Energy Research Institute Co., Ltd, Xi’an 710000 |
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Abstract Controlled switching technology can reduce the impact of the transient over-voltage and inrush current to the system at the moment of circuit breaker opening and closing, and prolong the service life of the circuit breaker. This paper proposes a controlled switching device architecture with high precision. The device selected FPGA plus ARM in control side to improve the precision, and uses Solid State Relay in output side to improve the speed. The device has the function of measure opening/closing time of the circuit breaker, and also can use the last operating results to adapt correct the subsequent operate. The device can monitor the external variables affecting the mechanical characteristic of the circuit breaker, and use the LUT method to make a compensation control. Through laboratory tests, the accuracy of the device is less than 0.1ms, and the deviation of adaptive and compensation control is less than 0.2ms.
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Received: 22 May 2020
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2020, Vol. 21 
