220kV分级绝缘变压器中性点保护配置探讨  

On the Neutral Point Protection Configuration of 220 kV Graded Insulation Transformers

作　　者：张霖[1] 杨超[1] 

机构地区：[1]贵阳供电局,贵阳550001

出　　处：《南方电网技术》2011年第A01期75-78,共4页Southern Power System Technology

摘　　要：为选择220kV分级绝缘变压器中性点保护方式，对220kV分级绝缘变压器中性点避雷器和放电间隙的保护配置作了分析探讨。根据贵阳电网220kV中性点接地系统不接地变压器采用了氧化锌避雷器（MOA）和保护间隙配合方式，推算变压器中性点保护间隙，并将气象因素纳入计算过程，认为应尽量按最大保护间隙距离进行选取，以防止保护间隙过于频繁动作，同时可满足过电压保护的要求。To choose a proper neutral point protection for 220 kV graded insulated transformer, the paper analyzes the protection configuration of arrester and discharge gap for the neutral point of 220 kV graded insulated transformer. According to the situation of Guizhou Power Grid, in which its 220 kV un-earthed transformer of neutral point grounding system adoptes coordinated protection by metal oxide arrester （MOA） and protective gap, the paper calculates the protection gap of the transformer＇s neutral point, takes weather factor into consideration, and concludes that a maximum protection gap should be selected to prevent frequent operation, and meets the over-voltage protection requirements.

关 键 词：分级绝缘变压器 中性点 避雷器 保护间隙 

分 类 号：TM403.5[电气工程—电器]