The railway safety relay is an important executable component in railway system, whose electrical characteristics must be tested timely.
铁路安全继电器是铁路系统中的重要执行元件，必须定期对其电气特性进行测量。
The electrical characteristics of railway safety relay are mainly involved with operating value, releasing value, reversing value and so on.
铁路安全继电器需要测试的主要电气参数包括：工作值、释放值、反向工作值等。
Therefore it is necessary to perfect the existing relay equipment based on the rule of fault-safety in order to achieve the function of railway signal computer-based interlocking control system.
操作表示机是计算机联锁系统中关键的人机界面设备，硬件上利用继电器组成的逻辑电路，实现双机热备的倒机逻辑控制和设备接口电缆的动态切换。
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