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勵磁柜故障檢修步驟

2018-08-22

 

勵磁柜故障檢修步驟

1. 勵磁柜檢測時不投勵 ,處理步驟如下: 

(1) 將投勵插件拔出,檢測勵磁柜的手動投勵是否正常; 

(2) 如果手動投勵正常,說明勵磁柜的主回路完好,應檢查轉換開關觸點是否接觸良好;檢查投勵插件提供電源的65V變壓器是否工作正常;檢查投勵插件本身是否有故障;  

(3) 如果手動投勵不正常,應檢查主回路是否正常,重點檢查整流二極管及投勵可控硅是否損壞;檢查勵磁柜與同步機轉子是否連接好,重點檢查碳刷是否接觸好。  2.jpg

2. 勵磁柜檢測時能自動投勵,但正常開機時不能自動投勵 ,處理步驟如下:

檢測時能自動投勵,說明勵磁柜主回路、檢測回路及投勵插件都正常,應重點檢查與高壓柜的連鎖接點,以及開機時轉子是否能真正達到亞同步。  

(1) 將開關柜拖至試驗位置,現場模擬開機,當按下現場啟動按鈕,高壓開關柜合閘后,同步機勵磁柜能自動投勵成功,說明勵磁柜與高壓柜之間的連鎖不存在問題;  

(2) 如果模擬開機也不能自動投勵,應檢查勵磁柜與高壓柜的連鎖接點是否閉合好;  

(3) 如果開機時轉子達不到亞同步造成不能自動投勵,應對投勵插件進行調試。 

3. 勵磁柜檢測時不能滅磁,處理步驟如下:

(1)檢查轉換開關的接點是否接觸良好,對觸點進行處理; 5.jpg

(2)再次檢查滅磁,若還不能滅磁,重點檢查滅磁插件2CW21穩壓管;  

(3)檢查滅磁可控硅。  

4. 勵磁柜在運行過程中勵磁電壓幾乎為零,勵磁電流基本正常,處理步驟如下:

(1)檢查滅磁電阻是否發熱,如果不發熱,檢查電壓是否損壞;  

(2)如果發熱,說明擊穿保險、二極管、可控硅有擊穿,一般多為擊穿保險擊穿,應立即停機對主回路進行檢查;  

(3)重點檢查擊穿保險,若擊穿保險器損壞,應對其進行更換; 


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