| 引用本文: | 王冰清,李本瑜,宋晓亮.基于瞬时功率理论的变压器CT接线校验方法[J].电力系统保护与控制,2019,47(6):173-179.[点击复制] |
| WANG Bingqing,LI Benyu,SONG Xiaoliang.Verification method for transformer CT wiring based on instantaneous power theory[J].Power System Protection and Control,2019,47(6):173-179[点击复制] |
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| 摘要: |
| 变压器CT接线的正确性是变压器保护装置正确动作与测控装置准确工作的基础。为了解决现有主变CT二次回路接线校验方案准确性差、步骤复杂、效率低等问题，提出一种基于瞬时无功功率理论的利用变压器空载合闸时所产生的励磁涌流来校验高压侧CT接线的方法。该方法通过分析励磁涌流的产生机理并利用其功率特性，即可对变压器高压侧的CT极性及相序接线进行校验，并在检测出CT接线错误的情况下，经延时动作出口。在有效提升变压器新设备启动效率的同时，提高了系统运行的可靠性。RTDS仿真及实验验证了该方法的有效性。 |
| 关键词: 变压器保护 励磁涌流 瞬时无功功率理论 CT极性校验 |
| DOI：10.7667/PSPC180430 |
| 投稿时间：2018-04-16修订日期：2018-07-24 |
| 基金项目:国家重点研发计划项目资助(2018YFB0904900);南网云南省电力公司科技项目资助(YNKJXM00000511) |
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| Verification method for transformer CT wiring based on instantaneous power theory |
| WANG Bingqing,LI Benyu,SONG Xiaoliang |
| (CYG SUNRUI CO., Ltd., Shenzhen 518057, China;Yunnan Electric Power Dispatching Control Center, Kunming 650011, China) |
| Abstract: |
| The correctness of the transformer CT wiring is the basis for the correct operation of the transformer protection device and the accurate operation of the measurement and control device. In order to solve the problems of poor accuracy, complicated procedures, and low efficiency of the current main transformer CT secondary circuit wiring verification scheme, a method based on the instantaneous reactive power theory utilizing the inrush current during the transformer no-load closing period to verify the high-voltage side CT wiring is proposed. By analyzing the inrush current’s mechanism and using its power characteristics, this method can verify the CT polarity and phase sequence wiring on the high voltage side of the transformer. Once wiring errors are detected, the protection device will act after the delay setting. While effectively improving the startup efficiency of new transformer equipment, the reliability of system operation is improved. RTDS simulation and experiment validate the effectiveness of the method. This work is supported by Science and Technology Project of Yunan Electric Power Company of China Southern Power Grid (No. YNKJXM00000511). |
| Key words: power transformer protection inrush current instantaneous power theory CT polarity verification |
