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详细介绍：

Voltage relays are dedicated to check AC voltages on electrical power networks. Apart from the usual over- and undervoltage protections on the bus-bars of substations or distribution stations, or on the terminals of rotating machines, many applications are concerned, as: undervoltage function with supervision of the auxiliary supply, supervision of rotating machine torque, check of induction motor flux decay, before reclosure in an automatic transfer sequence. If they are correctly applied they provide protection of both equipment and personnel together and ensure the best possible quality electrical power supply.