| 摘要: |
| 电压互感器并列由于误操作或设备故障而引起的反充电事故时有发生。分析了传统电压互感器并列装置工作原理，总结了其防反充电的不足，并研制出一种以可编程控制器为核心的防反充电电压互感器并列装置。其并列条件增加了模拟量（电压）判据，当同相电压差大于设定值时，不允许并列运行。同时利用新型电子器件自恢复保险丝（PPTC），在并列回路中增加可自行恢复的过流阻断电路，当并列回路电流过大时自动解列，故障解除时，回路又能快速恢复导通。该装置能从根本上防止反充电导致空开脱扣及设备损坏等事故的发生，有效保证了电网的安全稳定运行。 |
| 关键词: 电压互感器 防反充电 并列 可编程控制器 自恢复 |
| DOI： |
| 投稿时间：2013-07-04修订日期：2013-10-28 |
| 基金项目: |
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| Development of a PT parallel device used to prevent reverse charge |
| LI Peng,ZHONG Zhu-hui |
| (Changde Power Supply Company of Hunan Electric Power Company, Changde 415000, China) |
| Abstract: |
| PT reverse charge incident always happens in power system due to incorrect operation or equipment failure. This paper analyzes the working principle of traditional PT parallel device, summarizes its deficiency in anti reverse charge, and develops an anti reverse charge device with programmable controller as core for PT parallel. The analog (voltage) criterion is increased to its parallel conditions. It does not allow to parallel when in-phase voltage difference is greater than the set value. At the same time, a self recovery circuit with new electronic device (PPTC) is designed in the parallel circuit, in order to block circuit when the parallel loop current is too large, then the circuit can automatically split. And when the failure is lift, the parallel loop circuit can renew to conduct. The developed device can fundamentally prevent reverse charge in parallel operation, thus it can prevent the air switch to trip and the equipment to be damaged, which ensures the safety and stability operation of the power grid. |
| Key words: PT prevent reverse charge parallel programmable controller self recovery |
