MOA's Lightning Overvoltage Protection Distance of Main Transformer in Offshore Substation

doi:10.3969/j.issn.1000-7229.2016.02.020

Abstract

Abstract:

Domestic main transformer was exposed in early time and its conserver was likely to be stroke by lightning. Through the analysis on the causes of the protection distance of metal oxide arrester （MOA）, this paper constructs the transient model of transformer during lightning stroke with using electromagnetic transient simulation software ATP/EMTP, and analyzes the influences of lightning current amplitude and MOA's position on the overvoltage of substation devices combined with engineering examples. The results show that, the main transformer is the mainly influenced device in the platform, and the MOA's position has a great effect on the lightning overvoltage of the transformer, during the lightning stroke on the conserve in main transform. Therefore, this paper further analyzes the protection distance of MOA, whose results show that MOA should be installed as close as possible to the main transformer during the design of offshore substation. At last, through the parameter fitting, we obtain the curves of MOA's protection distance with lightning current amplitude and that with earth resistance, which can a reference for the MOA's installment in offshore substation.

Key words: offshore substation, transformer, lightning overvoltage, metal oxide arrester （MOA）, protection distance

CLC Number:

TM 862

XU Yang，ZHU Sheng，LAN Lei，WANG Yu，WEN Xishan. MOA's Lightning Overvoltage Protection Distance of Main Transformer in Offshore Substation[J]. Electric Power Construction, 2016, 37(2): 138-144.

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