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铁路信号设备的安全性和可靠性直接关系到铁路运输的安全和效率,二者既相互联系又相互制约。从安全角度考虑,信号设备必须要符合“故障-安全”原则。在ZPW-2000A无绝缘移频自动闭
The safety and reliability of railway signal equipment are directly related to the safety and efficiency of railway transportation. Both of them are interconnected and mutually restrained. From a security point of view, the signal equipment must comply with the “fail-safe” principle. ZPW-2000A without insulation frequency shift automatic closure