Electro-Magnetic Loop Breaking Scheme for Limiting Short-Circuit Current of Power Grid in Eastern Qinghai

Xu FU; Fuchun LI

doi:10.16513/j.2096-2185.DE.2002008

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Distributed Energy ›› 2020, Vol. 5 ›› Issue (2) : 57-62. DOI: 10.16513/j.2096-2185.DE.2002008

Application Technology

Electro-Magnetic Loop Breaking Scheme for Limiting Short-Circuit Current of Power Grid in Eastern Qinghai

Xu FU ,
Fuchun LI

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Abstract

With the gradual strengthening of Qinghai power grid, there are more 750/330 kV electromagnetic loop grid, and the problem of short-circuit current of 330 kV power grid is getting more and more serious, which brings challenges to the safe operation of Qinghai power grid. This paper studies the feasibility of limiting the short-circuit current of the eastern Qinghai power grid through the electromagnetic uncoupling, the branching method is used to simulate the electromagnetic division and bus splitting, and the sensitivity of short-circuit current is derived, which improved the calculation speed of short-circuit current. The electromagnetic decoupling scheme of 750/330 kV power grid in eastern Qinghai is proposed: (1) The 330 kV electromagnetic loop grid between Xining and Qingshan was selected to disconnect the 330 kV line from Shancheng to Jingyang; (2) The 330 kV electromagnetic loop grid between Xining and Haidong was carried out by 330 kV bus division with two transformers for Xining area and two transformers for Haidong area; (3) The 330 kV electromagnetic loop grid between Guolong and Guanting uses the disconnection of the Alan-Minhe 330 kV lines. The short-circuit current calculation results show that bus bar splitting and electromagnetic unlooping are effective means to limit the short-circuit current of the eastern Qinghai power grid.

Key words

short circuit current limitation / electromagnetic division / bus splitting / Qinghai power grid

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Xu FU , Fuchun LI. Electro-Magnetic Loop Breaking Scheme for Limiting Short-Circuit Current of Power Grid in Eastern Qinghai[J]. Distributed Energy Resources. 2020, 5(2): 57-62 https://doi.org/10.16513/j.2096-2185.DE.2002008

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