数据输出模块将组帧后的数据传送到以太网控制器，继而发送给二次保护测控设备。
Data-output module, its functions is transmitting combining frame data to Ethernet controller, then send the data to the protective device.
主要原因是锅炉安全阀二次保护回路设计有缺陷，再加上安全阀起跳和回座的整定值与运行额定值相重叠造成的。
The main reasons were due to the defect in the design of safety valve secondary circuit and the overlap of the service rating and the setting for safety valve popping and reseating.
由两个主控制继电保护系统对各条500千伏传输线进行保护，该控制继电保护系统上装有一只后备继电器，以实现初级保护与二次保护。
Each 500 kV transmission line will be protected by two primary pilot relaying systems with a backup relaying to achieve primary and secondary protection.
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