文章摘要
曹文斌,尹项根,王育学,等.高阻抗变压器涌流的特殊性比较分析[J].电力系统自动化,2019,43(16):141-147. DOI: 10.7500/AEPS20180705003.
CAO Wenbin,YIN Xianggen,WANG Yuxue, et al.Comparative Analysis of Particularity for Inrush Current Generated by High-impedance Transformer[J].Automation of Electric Power Systems,2019,43(16):141-147. DOI: 10.7500/AEPS20180705003.
高阻抗变压器涌流的特殊性比较分析
Comparative Analysis of Particularity for Inrush Current Generated by High-impedance Transformer
DOI:10.7500/AEPS20180705003
关键词: 高阻抗变压器  高压绕组内置  低压绕组串联电抗  空心电感  涌流特殊性
KeyWords: high-impedance power transformer  high-voltage winding built-in  inductance connected in series at low-voltage winding  air-core inductance  particularity of inrush current
上网日期:2019-07-10
基金项目:国家重点研发计划资助项目(2016YFB0900600);广东电网有限责任公司科技项目(GDKJXM20162461)
作者单位E-mail
曹文斌 强电磁工程与新技术国家重点实验室(华中科技大学), 湖北省武汉市 430074
电力安全与高效湖北省重点实验室(华中科技大学), 湖北省武汉市 430074 
1019097704@qq.com 
尹项根 强电磁工程与新技术国家重点实验室(华中科技大学), 湖北省武汉市 430074
电力安全与高效湖北省重点实验室(华中科技大学), 湖北省武汉市 430074 
 
王育学 广东电网有限公司电力调度控制中心, 广东省广州市 510000  
张哲 强电磁工程与新技术国家重点实验室(华中科技大学), 湖北省武汉市 430074
电力安全与高效湖北省重点实验室(华中科技大学), 湖北省武汉市 430074 
 
郭乾 强电磁工程与新技术国家重点实验室(华中科技大学), 湖北省武汉市 430074
电力安全与高效湖北省重点实验室(华中科技大学), 湖北省武汉市 430074
广东电网有限公司电力调度控制中心, 广东省广州市 510000 
 
潘远林 强电磁工程与新技术国家重点实验室(华中科技大学), 湖北省武汉市 430074
电力安全与高效湖北省重点实验室(华中科技大学), 湖北省武汉市 430074 
 
摘要:
      近年来高阻抗变压器空投时零序过流保护误动的事故频繁发生,文中围绕高阻抗变压器涌流的特殊性展开研究。首先明晰了变压器“绕组排布-磁通分布-等值电路参数”的对应关系以及励磁涌流产生机理。根据高压绕组内置型高阻抗变压器、低压绕组串联电抗型高阻抗变压器与普通结构型常规阻抗变压器的结构差异阐释了等值电路中自漏感和空心电感等参数的差异。基于参数差异,从理论上分析比较了三者涌流的特殊性:相同条件下,内置型高阻抗变压器的励磁涌流幅值大于串联电抗型高阻抗变压器和普通结构型常规阻抗变压器。考虑三角绕组环流影响后,串联电抗型高阻抗变压器的原方涌流幅值大于普通结构型常规阻抗变压器;三者涌流衰减均很缓慢,相对而言内置型高阻抗变压器较另两个略快。仿真结果验证了所得结论的正确性。
Abstract:
      In recent years, zero-sequence over-current protections misoperate frequently when the high-impedance transformers are energized. This paper focuses on the particularity of inrush currents of high-impedance transformer. Firstly, the relationship of “winding structure-flux distribution-equivalent circuit parameters” and the mechanism of the magnetizing inrush current are clarified. According to the structural differences among the high-impedance transformer with high-voltage winding built-in(T-Hin), the high-impedance transformer with inductance connected in series at low-voltage winding(T-Lse)and the traditional impedance transformer with ordinary structure(T-Tra), the parameter differences such as self-leakage inductance and air-core inductance in the equivalent circuit are explained. According to the parameter differences, the particularity of inrush currents generated by three kinds of transformers is theoretically analyzed and compared. Under the same condition, the inrush current amplitude of T-Hin is greater than that of T-Lse and T-Tra. When considering the influence of the circulation current of delta winding, the primary winding current of T-Lse is larger than that of T-Tra. The three inrush currents decay slowly, the inrush current of T-Hin is slightly faster than the other two relatively. The conclusion is verified by simulation results.
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