变压器三角绕组环流助增作用分析及其工程求取方法  

Analysis of the Helping Effect and Engineering Calculation Method for Transformer Circulating Current in Delta Winding

作　　者：曹文斌[1,2] 尹项根 张哲[1,2] 王育学[3] 潘远林 Cao Wenbin;Yin Xianggen;Zhang Zhe;Wang Yuxue;Pan Yuanlin(State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Province Key Laboratory Electric Power Security and High Efficiency Huazhong University of Science and Technology,Wuhan 430074,China;Power Dispatching Control Center of Guangdong Power Grid,Guangzhou 510000,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),武汉430074 [2]电力安全与高效湖北省重点实验室(华中科技大学),武汉430074 [3]广东电网有限责任公司电力调度控制中心,广州510000

出　　处：《电工技术学报》2020年第15期3161-3172,共12页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划智能电网与装备重点专项(2016YFB0900600);广东电网有限责任公司科技项目(GDKJXM20162461)资助。

摘　　要：Y-d变压器三角绕组环流的助增作用会使变压器一次侧涌流产生畸变,基于典型励磁涌流特征的涌流制动判据的可靠性会受到影响。通过变压器回路微分方程和机理分析,从物理本质上揭示环流的产生机理、助增作用及影响因素,表明环流和不饱和相一次电流相等。该文提出将一次侧三相涌流中间值作为准环流代替实际环流来补偿一次侧涌流,使一次侧涌流具备典型励磁涌流特征,以提高涌流识别能力。在有剩磁时的适应性分析表明其具有工程实用性。该方法与接地方式无关,不要求系统电压平衡对称。数字仿真和现场录波验证了该方法的有效性。The helping effect of circulating current in the delta winding of Y-D-connected transformer will cause the primary inrush current to be distorted, and the reliability of the inrush current restraint criterion based on the typical characteristics of magnetizing inrush current will be affected. The generating mechanism, the helping effect and the influencing factors of the circulating current were revealed through the differential equation and mechanism analysis. It shows that the primary current of unsaturated phase is equal to the circulating current. Based on this, it was proposed to use the intermediate value of the three-phase primary inrush current as quasi circulating current instead of the actual circulating current to compensate the primary inrush current, so that the primary inrush current will have typical characteristics of magnetizing inrush current and will be more easily identified. The adaptability analysis of the method in the presence of remanence shows that it has good engineering practicability. The method has nothing to do with the grounding mode, and does not require the system voltage to be balance or symmetrical. Simulations and recorded waveforms have verified the effectiveness of the method.

关 键 词：三角绕组 环流 助增作用 准环流 工程实用 

分 类 号：TM77[电气工程—电力系统及自动化]