| 引用本文: | 冯宇,尹志荣,王欢,等.采用等安匝原理的自校式CT误差测量方法[J].电力系统保护与控制,2018,46(14):158-164.[点击复制] |
| FENG Yu,YIN Zhirong,WANG Huan,et al.An error measurement method of self calibration current transformers by using the theory of equal ampere-turns[J].Power System Protection and Control,2018,46(14):158-164[点击复制] |
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| 摘要: |
| 为解决特高压交流输电气体绝缘封闭式开关设备(Gas-Insulated metal-enclosed Switchgear, GIS)中的电流互感器(Current Transformer, CT)现场误差测量试验难以开展的问题，提出了采用等安匝原理的自校式CT误差测量方法。通过在CT铁心上设置同样结构的双二次绕组，以实现CT误差的自校。正常运行时双二次绕组并联连接；进行误差测量时，双二次绕组分开，通过向其中一个绕组(等效一次绕组)输入电流，构造出等效于正常运行状态下的磁势，通过自校法测差电路可实现对另一绕组(等效二次绕组)的误差测量。与传统比较法相比，可有效降低现场工作环境下对大型试验设备和电源的要求，减少试验和运维工作量。对工程用自校CT线圈的仿真及试验，验证了所提方法的有效性。 |
| 关键词: 特高压 电流互感器 等安匝 自校 误差测量 |
| DOI：10.7667/PSPC171076 |
| 投稿时间：2017-07-19修订日期：2017-11-20 |
| 基金项目:国家电网公司科技项目(GY71-15-034) |
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| An error measurement method of self calibration current transformers by using the theory of equal ampere-turns |
| FENG Yu,YIN Zhirong,WANG Huan,JIANG Min,BAI Yang,WANG Xiaoqi |
| (State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan Branch, Wuhan 430074, China;Maintenance Corporate of Shanxi Provincial Electric Power Corp, Taiyuan 030032, China;Electric Power Research Institute, Shanxi Provincial Electric Power Corp, Taiyuan 030001, China) |
| Abstract: |
| In order to solve the problems occurred in field error measurement of current transformer in UHV AC transmission Gas-insulated Metal-enclosed Switchgear (GIS), an error measurement method of self calibration CT realized by equal ampere-turns is proposed. Double secondary windings with the same structure are arranged in the CT’s core to realize error self calibration of CT. In normal working condition, the double secondary windings are connected in parallel; in the error test, the double secondary windings are separated, through inputting current to one of the secondary winding (equivalent to primary winding), the magnetic potential under the equivalent normal working condition is constructed, and the measurement of CT’s error can be realized by measuring the other winding’s current (equivalent to the secondary winding) under the self calibration circuit. Compared with the traditional comparison method, it can effectively reduce the requirements of large-scale test equipment and power supply in field work, and reduce the workload of test and operation and maintenance. The simulation and experiment of the self calibration CT used in the engineering demonstrate the effectiveness of the method. This work is supported by Science and Technology of State Grid Corporation of China (No. GY71-15-034). |
| Key words: UHV current transformer equal ampere-turns self calibration error measurement |
