隔离电压(isolation voltage)：电路中任何部份与底板的地之间可允许操作的最大电压。此最大的交流或直流电压亦需适用于电源供给器的输入端与输出端之间。
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连接的电气元件有断路器、隔离开关与接地开关、电流互感器、电压互感器、避雷器、母线等。
The electrical elements connected include circuit breaker disconnector and earthing switch current transformer voltage transformer lightning arrester bus etc.
其特征是不要外接偏置电压源，而由一个特殊隔离变换器将输入逻辑信号变换为能快速开通或关断IGBT模块的驱动电力。
Its feature is that the input logical signal is converted to drive power by a special isolated converter, which makes a IGBT module turn on or off quickly, without any other biased voltage sources.
在系统控制方面，把PLC系统成功的应用在高电压系统中，通过隔离，解决了干扰问题。
From the view of auto control, system of PLC is successfully applied to the system of high voltage, using photoelectric isolated circuit to solve the problem of electromagnetic disturbance.
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