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Technical scheme analysis of over voltage protection for 3~35kV medium voltage power supply system
Xuwenmin1  Liugenping2  Guosijun3
£¨1.Jiangxi Jinshan  Mining CO.ltd, Shangrao 334000, China£»2.Changchun Gold Design Institute, Changchun 130012,China ;3.Wuhu Keyue Electric Co., Ltd. Wuhu 241000, China£©
Abstract:In China, the 3~35kV medium voltage power supply system generally adopts the power supply mode of neutral point ungrounded or neutral grounded by arc suppression coil.In recent years, some enterprises began to use neutral grounding by small resistance.According to different grounding modes of power supply system,how to set the system over-voltage prevention measures to allow designers and technical staff to generate confusion. In this paper, three kinds of overall protection schemes are proposed for different grounding modes of power supply system. The principle, advantages and disadvantages of the three schemes are analyzed.The technical feasibility and economy of overvoltage protection scheme for medium voltage power supply system. In order to find an effective preventive measures to improve the quality of power supply.
Key words:Overvoltage;Lightning arrester;Overvoltage protector ;arc suppression coil;Resistance cabinet ;Multilevel protection
 
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