Analysis on the Unbalanced Circuit Current of the 3/2 Wiring System of 1 000 kV UHV Nanyang Substation

doi:10.11930/j.issn.10.11930.2015.1.92

Abstract

Abstract: 3/2 main wiring is used in the 1 000 kV system of UHV AC substation. Since the resistive unbalance in the main conductive circuit is significant and the power transmission capacity is large, unbalanced circulation exists in the 3/2 wiring system. In extreme case, some breakers’ single-phase current appears zero or even phase-inverted. Based on the UHV Nanyang substation, the zero-sequence of the unbalanced circulation and the cause are theoretically analyzed. The serious problems and consequences of the secondary system caused by zero-sequence circulation during large load operation are discussed and several solutions are proposed: the conflux current of two breakers is used for protection device; the minimum current of 3-phase brakes the zero-sequence module in single breaker; the conflux current of two breakers brakes single breaker zero-sequence module. This analysis is expected to call enough attention to be paid to the unbalanced circulation in the future projects.

Key words: UHVAC, UHVAC substation, main conductive circuit, resistive unbalanced, unbalanced circuit, zero-sequent circuit

CLC Number:

TM711

LIU Tao, FANG Jinyan, CHENG Chaolei, HUANG Jianjin, XU Ruina. Analysis on the Unbalanced Circuit Current of the 3/2 Wiring System of 1 000 kV UHV Nanyang Substation[J]. journal1, 2015, 48(1): 92-97.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.1.92

https://www.electricpower.com.cn/EN/Y2015/V48/I1/92

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