作者：范兴明, 任小明, 张鑫
作者单位：桂林电子科技大学电气工程及其自动化系, 广西 桂林 541004
关键词：自供电;感应取电;电容分压;继电保护
摘要：
为克服电力设备在户外通过传统的取电方式取电不便以及供电不稳定的缺点，设计一种改进的CT自供电继电保护装置。该装置通过特制CT直接从被保护的电网汲取电能，去除对辅助电源的依赖性，同时能够实现对线路电流的采样、计算和保护。针对在实际应用中存在的轻负荷或过负荷（或者短路故障）状态下电流不稳定的问题，分别采取由微控制器控制远方跳闸输入电路、输入外部电能供电以及动态电能管理电路进行电流泄放的解决方案，使用Matlab软件对传递函数公式以及自供电电源取电分别进行仿真分析与验证。结果表明能够实现稳定取电，并验证公式的正确性，达到预期效果。
Power supply design of relay protection device based on self-powered technology
FAN Xingming, REN Xiaoming, ZHANG Xin
Dep. of Electrical Engineering & Automation, Guilin University of Electronic and Technology, Guilin 541004, China
Abstract: In order to overcome the inconvenience of power equipment taking electricity outdoors traditionally and the instability of power supply, a type of improved CT self-powered relay protection device was designed. The device, designed in this paper extracting power directly from the protected grid through a custom CT, removes the reliance on auxiliary power supply while enabling sampling, computation and protection of line currents. As for the current instability with light load and overload (or short circuit fault) during practical application, microcontroller was adopted to control the remote trip input circuit to input external power supply and dynamic power management circuit was adopted to discharge current, and Matlab software was also adopted to carry out simulation analysis and verification for transfer function formula and self-power supply. The results show that it can achieve a steady power take-up, verify the formula, and achieve the desired results.
Keywords: self-powered;induction power;capacitance divider;relay protection
2018, 44(9): 80-85 收稿日期: 2017-12-08;收到修改稿日期: 2018-02-06
基金项目: 国家自然科学基金（61741126，51067002）；广西科技开发项目（桂科重1348003-8）；广西制造系统与先进制造技术重点实验室主任课题（16-380-12-006Z）
作者简介: 范兴明(1978-),男,广西桂林市人,教授,博士,主要研究领域为智能化电器和高电压新技术
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