帶電測量斷路器接觸電阻方法的研究
陳杏燦,程漢湘,彭湃,冼冀
廣東工業(yè)大學 自動化學院,廣東 廣州 510006
摘 要:提出了一種可對運行中的斷路器實時測量其接觸電阻的新方法。通過兩個電壓互感器采集斷路器兩端對地電壓,求得斷路器兩端的電壓差,同時測得流過斷路器的電流,根據(jù)歐姆定律即可得接觸電阻。分析表明,該方法可在保證測量系統(tǒng)與高壓隔離的前提下,實時帶電測量斷路器的接觸電阻。對預防斷路器的安全事故,保證斷路器可靠運行具有重要意義。
關鍵詞:斷路器;接觸電阻;帶電測量
中圖分類號:TM561;TM934.14 文獻標識碼:A 文章編號:1007-3175(2015)04-0046-03
Design of Electrified Measuring Contact Resistance in Circuit Breakers
CHEN Xing-can, CHENG Han-xiang, PENG Pai, XIAN Ji
Faculty of Automation, Guangdong University of Technology, Guangzhou 510006, China
Abstract: This paper presented a new real-time measuring method for the contact resistance of the operated circuit breakers. A pair of potential transformer worked in parallel to measure indirectly the voltage difference on the two terminals of the circuit breaker, while the currents flowing through circuit breakers were measured by current transformers. The result of contact resistance could be obtained based on Ohm Law. The analysis shows that this method could not only guarantee the isolation between control system and strong current, but also measure the contact resistance in real time, which would effectively prevent circuit breakers accidents.
Key words: circuit breaker; contact resistance; live line measurement
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