New protection scheme for step-down transformer and corresponding middle and low voltage buses based on longitudinal comparison principle

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作者：
Shandong University, Jinan 250061, China [1 ]
不详 [2 ]
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来源：
Dianli Xitong Zidonghue | 2006年 / 1卷 / 83-85期
关键词：
Electric fault location - Electric transformers;
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摘要：
A new protection scheme for step-down transformer and connecting buses based on longitudinal comparison principle is presented. In case of a fault occurring, the scheme can determine fault location and isolate fault quickly according to the outputs of the measurement elements equipped in all sides of the transformer and its middle and low voltage outgoing feeders. The scheme can be taken as the high speed backup protection of the transformer and main protection of the middle and low voltage buses.
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