| 引用本文: | 乔中伟,钱敏,郭松伟,等.二次电缆对地分布电容对强电开入回路的影响研究[J].电力系统保护与控制,2018,46(13):161-165.[点击复制] |
| QIAO Zhongwei,QIAN Min,GUO Songwei,et al.Research on influence of secondary cable distributed capacitance on high voltage input circuit[J].Power System Protection and Control,2018,46(13):161-165[点击复制] |
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| 摘要: |
| 通过对光耦开入回路原理的研究，发现了开关量变位时光耦开入电压的变化特征。通过对开入电压变化特征的影响因素分析，借助于二次电缆对地分布电容的测试数据及定量分析计算，发现了二次电缆对地分布电容会引起开关量的延迟变位。由于断路器分闸时间比较短，因此在断路器分闸时，故障录波等装置记录到的断路器分、合位会出现交叉现象。通过对延迟时间的影响因素分析,提出了减缓电缆分布电容对强电开入回路影响的有效措施，即减小光耦开入回路限流电阻阻值和提高光耦开入回路的返回电压。 |
| 关键词: 光耦 分布电容 延迟变位 交叉 电阻 返回电压 |
| DOI：10.7667/PSPC170899 |
| 投稿时间：2017-06-15修订日期：2018-02-25 |
| 基金项目:国家高技术研究发展计划项目资助(863计划) (2014AA052001) |
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| Research on influence of secondary cable distributed capacitance on high voltage input circuit |
| QIAO Zhongwei,QIAN Min,GUO Songwei,DING Qing,WANG Shixiang,YUAN Zhijun |
| (Shenzhen Power Supply Bureau Ltd, Shenzhen 518000, China) |
| Abstract: |
| Based on the research about the principle of input circuit of optocoupler, the switching characteristic of input voltage of optocoupler is found. Through the analysis of the influence factors of input voltage of optocoupler, based on the test data of the distributed capacitance of the cable and quantitative analysis, it is found that the distributed capacitance of the cable can cause the switching delay of the switch. Because of the switching time is shorter, when the breaker is switched off, the breaker position recorded by the fault recorder and other devices will intersect. By analyzing the influence factors of the delay time, the effective measures to reduce the influence of the distribution capacitance of the cable on the high voltage input circuit are put forward, that is, reducing the resistance and raising the return voltage of input circuit of optocoupler. This work issupported by National High-tech R & D Program of China (863 Program) (No. 2014AA052001). |
| Key words: optocoupler distributed capacitance switching delay intersect resistance return voltage |
