A Novel Algorithm to Avoid the Maloperation of UHV Voltage-Regulating Transformers

被引:16
|
作者
Zheng, T. [1 ]
Chen, P. L. [1 ]
Qi, Z. [1 ]
Terzija, V. [2 ]
机构
[1] North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China
[2] Univ Manchester, Manchester M60 1QD, Lancs, England
基金
英国工程与自然科学研究理事会;
关键词
Current-transformer (CT) saturation; differential current protection; equivalent instantaneous inductance; magnetizing inrush; normalized equivalent instantaneous inductance (NEII); second harmonic restraint; turn-to-turn fault; ultra-high voltage (UHV) transformer; voltage-regulating transformer; waveform symmetry; MAGNETIZING INRUSH CURRENT; DIFFERENTIAL PROTECTION; IDENTIFICATION; TRANSIENT;
D O I
10.1109/TPWRD.2014.2301452
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A typical maloperation case of the differential protection utilized in the ultra-high voltage (UHV) voltage-regulating transformer (VRT) under inrush conditions is investigated in this paper. It indicates that the second harmonic restraint principle cannot identify the inrush current reliably under such conditions. This paper proposes a normalized equivalent instantaneous inductance (NEII)-based inrush blocking method, which improves the equivalent instantaneous inductance (EII)-based method in the UHV VRT protection. Although the EII-based method is capable of discriminating inrush currents and internal faults, some factors constrain its application, such as the field limitation of measuring the terminal voltage of the transformer and the difficulty of determining a reasonable threshold due to the diversity of transformer magnetizing characteristics. The proposed NEII-based method overcomes limitations of the EII-based method and can be adopted in UHVVRT protection. A number of simulation tests have verified the effectiveness of the proposed method.
引用
收藏
页码:2146 / 2153
页数:8
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