沼气发电机组是重要的应急电源保障，在某个新建雷达站进行电源切换试验时发现沼气发电机组存在循环启-停、无法持续供电的故障现象。一起来看看该问题的处理吧。

The biogas generator set is an important emergency power supply guarantee. During the power switching test at a newly built radar station, it was found that the biogas generator set has faults such as cyclic start stop and inability to provide continuous power. Let's take a look at the handling of this issue together.

针对此故障现象，存在两种可能原因：（1）沼气发电机组控制系统故障；（2）沼气发电机组启动信号取点存在问题。下面进行具体分析。

There are two possible causes for this malfunction: (1) a malfunction in the control system of the biogas generator set; (2) There is a problem with the starting signal of the biogas generator set. Below is a specific analysis.

沼气发电机组控制系统故障

Control system failure of biogas generator set

为排除沼气发电机组本身存在故障，技术人员对沼气发电机组进行空载测试和模拟测试。

To eliminate faults in the biogas generator unit itself, technicians conducted no-load and simulation tests on the biogas generator unit.

（1）在市电电源正常的情况下，技术人员断开沼气发电机组电源输出断路器，用手动方式启动沼气发电机组进行空载试机，机组运行 10 分钟，检查发动机和发电机参数均正常。

(1) Under normal mains power supply, technicians disconnect the power output circuit breaker of the biogas generator set and manually start the biogas generator set for no-load testing. The unit runs for 10 minutes and checks that the engine and generator parameters are normal.

（2）利用沼气发电机组自带的模拟测试功能，模拟市电停电后的自启动运行。技术人员按下沼气发电机组模拟测试键，沼气发电机组自行启动，机组运行 10分钟，检查发动机和发电机参数均正常。

(2) Utilize the built-in simulation testing function of the biogas generator set to simulate the self starting operation after a power outage. The technical personnel pressed the biogas generator set simulation test button, and the biogas generator set started on its own. The set ran for 10 minutes, and the engine and generator parameters were checked to be normal.

通过以上测试基本排除沼气发电机组自身原因引起的故障，下面对沼气发电机组启动信号来源进行分析。

Through the above tests, the faults caused by the biogas generator unit itself have been basically ruled out. Below, the starting signal source of the biogas generator unit will be analyzed.

沼气发电机组启动信号来源分析

Analysis of start-up signal sources for biogas generator units

（1）查看雷达站低压二次系统图中沼气发电机组启动信号（如图所示），当 401# 和 402# 开关同时因失电或故障断开时，147与149常闭触点、247与249常闭触点同时导通向沼气发电机组发送启动信号。两个触点信号同时接入沼气发电机组控制器内，进行逻辑和运算，沼气发电机组启动。（147 与 149 常闭触点为 401# 断路器的辅助触点，工作状态与401# 开关相反，247 与 249 常闭触点为 402#断路器的辅助触点，工作状态与 402# 开关相反）

(1) Check the start-up signal of the biogas generator set in the low-voltage secondary system diagram of the radar station (as shown in the figure). When the 401 # and 402 # switches are simultaneously disconnected due to power loss or fault, the normally closed contacts 147 and 149, as well as the normally closed contacts 247 and 249, are simultaneously connected to the biogas generator set to send the start-up signal. Two contact signals are simultaneously connected to the controller of the biogas generator set for logic and operation, and the biogas generator set is started. (147 and 149 normally closed contacts are auxiliary contacts for circuit breaker 401 #, working in opposite states to switch 401 #, while 247 and 249 normally closed contacts are auxiliary contacts for circuit breaker 402 #, working in opposite states to switch 402 #)

（2）查看雷达站高、低一次系统示意图，两路市电、一台沼气发电机组的配置以及沼气发电机组自启动时间均符合规范的要求，但进一步检查发现401# 开关位于ATS下端，当市电电源或沼气发电机组电源存在时，401# 开关均闭合，147和149常闭触电分开，沼气发电机组控制器经逻辑运算后，认为启动信号中断、市电恢复，沼气发电机组停止工作；随后因市电电源和沼气发电机组电源均不存在，401# 开关自动断合，147和149常闭触电闭合，发送沼气发电机组启动信号，沼气发电机组控制器经逻辑运算后，自动启动沼气发电机组工作，如此循环启 - 停。

(2) Upon reviewing the schematic diagram of the radar station's high and low primary systems, it was found that the configuration of two mains power sources and one biogas generator unit, as well as the self starting time of the biogas generator unit, all met the requirements of the specifications. However, further inspection revealed that the 401 # switch was located at the lower end of the ATS. When the mains power source or biogas generator unit power source was present, both 401 # switches were closed, and 147 and 149 normally closed electric shocks were separated. After logical calculation, the biogas generator unit controller believed that the starting signal was interrupted, the mains power was restored, and the biogas generator unit stopped working; Subsequently, due to the absence of both the mains power supply and the biogas generator set power supply, the 401 # switch automatically closed, and the normally closed electric shock of 147 and 149 closed, sending a start-up signal for the biogas generator set. After logical calculation, the biogas generator set controller automatically started the biogas generator set to work, thus starting and stopping in a cyclic manner.