differential voltage relay
... line differential current relay 线路纵差保护 differential voltage relay 差动电圧継电器 selective differential relay 选择性差动继电器 ; 选择差动继电器 ...
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differential voltage relay
差动电压继电器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Especially on the failure causes due to voltage differential relay protection, reason and treatment methods leading to operation failure are introduce in detail.
尤其对由于差压保护动作，导致投运失败的原因和处理方法作了详细的介绍。
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