The series mixed SPD is a new method of using for the railroad signal system of overvoltageprotection.
串混型SPD是铁路信号系统过电压防护的新用法。
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Finally, with the capacitor protection and the overvoltageprotection as an example, a model for the equipment and the function in the IEC 61850 protection is developed.
Schematic circuits of rectifier and filter, assistant power, overvoltageprotection, and charge control for storage battery are suggested , their working principle are also discussed.