沼氣發電機組是重要的應急電源保障，在某個新建雷達站進行電源切換試驗時發現沼氣發電機組存在循環啟-停、無法持續供電的故障現象。一起來看看該問題的處理吧。

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.

針對此故障現象，存在兩種可能原因：（1）沼氣發電機組控制系統故障；（2）沼氣發電機組啟動信號取點存在問題。下面進行具體分析。

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.

沼氣發電機組控制系統故障

Control system failure of biogas generator set

為排除沼氣發電機組本身存在故障，技術人員對沼氣發電機組進行空載測試和模擬測試。

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

（1）在市電電源正常的情況下，技術人員斷開沼氣發電機組電源輸出斷路器，用手動方式啟動沼氣發電機組進行空載試機，機組運行 10 分鐘，檢查發動機和發電機參數均正常。

(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）利用沼氣發電機組自帶的模擬測試功能，模擬市電停電后的自啟動運行。技術人員按下沼氣發電機組模擬測試鍵，沼氣發電機組自行啟動，機組運行 10分鐘，檢查發動機和發電機參數均正常。

(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.

通過以上測試基本排除沼氣發電機組自身原因引起的故障，下面對沼氣發電機組啟動信號來源進行分析。

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.

沼氣發電機組啟動信號來源分析

Analysis of start-up signal sources for biogas generator units

（1）查看雷達站低壓二次系統圖中沼氣發電機組啟動信號（如圖所示），當 401# 和 402# 開關同時因失電或故障斷開時，147與149常閉觸點、247與249常閉觸點同時導通向沼氣發電機組發送啟動信號。兩個觸點信號同時接入沼氣發電機組控制器內，進行邏輯和運算，沼氣發電機組啟動。（147 與 149 常閉觸點為 401# 斷路器的輔助觸點，工作狀態與401# 開關相反，247 與 249 常閉觸點為 402#斷路器的輔助觸點，工作狀態與 402# 開關相反）

(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）查看雷達站高、低一次系統示意圖，兩路市電、一臺沼氣發電機組的配置以及沼氣發電機組自啟動時間均符合規范的要求，但進一步檢查發現401# 開關位于ATS下端，當市電電源或沼氣發電機組電源存在時，401# 開關均閉合，147和149常閉觸電分開，沼氣發電機組控制器經邏輯運算后，認為啟動信號中斷、市電恢復，沼氣發電機組停止工作；隨后因市電電源和沼氣發電機組電源均不存在，401# 開關自動斷合，147和149常閉觸電閉合，發送沼氣發電機組啟動信號，沼氣發電機組控制器經邏輯運算后，自動啟動沼氣發電機組工作，如此循環啟 - 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.