protective impedance device
... protective earthing device 保护接地装置 protective impedance device 保护阻抗器 Control Protective Switching Device 控制与保护开关电器 ...
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介绍了后备阻抗保护对变压器绕组短路灵敏度很低。
It is described that the sensitivity of impedance back up protection for transformer wind short circuit is very low.
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