當焦化發(fā)電機組啟動到額定轉速后不能升壓時，檢查勵磁回路接線是否正確，有無斷線和接觸不良，電刷位置是否正確，接觸是否良好，勵磁電壓表有指示，可以達到很大的值，說明勵磁機磁場繞組的極性不能接反，剩磁也不會消失，因為我們拆開勵磁機轉子，用鐵皮包起來防止剩磁不會消失，電刷按原位安裝，其表面也磨成弧形，杜絕了電刷接觸不良的可能。

When the coking generator unit cannot boost voltage after starting to the rated speed, check whether the excitation circuit wiring is correct, whether there is disconnection and poor contact, whether the brush position is correct, whether the contact is good, and the excitation voltmeter has an indication, which can reach a large value, indicating that the polarity of the exciter field winding cannot be reversed, and the residual magnetism will not disappear, because we disassemble the exciter rotor and wrap it with iron sheet to prevent the residual magnetism from disappearing, The brush is installed in situ, and its surface is also ground into an arc, eliminating the possibility of poor contact of the brush.

在對電氣設備進行多方面檢查的同時，在其他電站相關電氣技術人員的大力協(xié)助下，用萬用表測得發(fā)電機轉子回路電壓只有幾伏。仔細分析后認為是轉子電路斷路。因此決定檢查勵磁電路。更換備用多股銅芯線時，發(fā)現(xiàn)勵磁開關閉合，用萬用表測試上下引出線，有一對觸點被堵住。

While checking the electrical equipment in many aspects, with the great assistance of relevant electrical technicians of other power stations, the generator rotor circuit voltage measured with a multimeter was only a few volts. After careful analysis, it is considered that the rotor circuit is open. Therefore, it is decided to focus on checking the excitation circuit. When replacing the spare multi strand copper core wire, it was found that the excitation switch was closed, the upper and lower outgoing lines were tested with a multimeter, and a pair of contacts were blocked.

立即取下滅弧罩，勵磁開關中的移相觸頭處于斷開位置。仔細一看，原來是膠木棒斷了。即使勵磁開關處于閉合狀態(tài)，其自由脫扣機構也不能隨主軸轉動。拉桿與膠木拉開時，勵磁開關的動、合觸點不閉合。

Remove the arc extinguishing cover immediately, and the phase-shifting contact in the excitation switch is in the off position. On closer inspection, it turned out that the bakelite stick was broken. Even if the excitation switch is closed, its free tripping mechanism cannot rotate with the main shaft. When the pull rod and bakelite are pulled apart, the dynamic and closing contacts of the excitation switch are not closed.

焦化發(fā)電機組廠家認為正是由于動觸頭相斷開，轉子放電電阻和磁場放電電阻沒有接通，勵磁機內的磁場電位越來越強，造成勵磁繞組過電壓。勵磁機，導致電纜短路，冒煙和燃燒。，也因為發(fā)電機轉子電路被堵死，轉子繞組沒有電流通過，發(fā)電機無法建立磁場，使發(fā)電機的定子無法建立電壓。至此，更換備件后，開機及運行均正常。

The manufacturer of coking generator set believes that it is precisely because the moving contact phase is disconnected, the rotor discharge resistance and magnetic field discharge resistance are not connected, and the magnetic field potential in the exciter is becoming stronger and stronger, resulting in overvoltage of the excitation winding. Exciter, resulting in cable short circuit, smoke and combustion., Also, because the generator rotor circuit is blocked, there is no current through the rotor winding, and the generator cannot establish a magnetic field, so that the generator stator cannot establish a voltage. So far, after replacing the spare parts, the startup and operation are normal.

找問題的時候一定要細心、細心，不能漏掉一些不起眼的細節(jié)，否則很難找到問題所在。如出現(xiàn)上述問題，應拆下勵磁開關的滅弧罩，及時發(fā)現(xiàn)問題。以上就是今天為大家分享的關于問題的相關內容，希望對大家能有所幫助，想要了解更多內容可以電話聯(lián)系我們或者關注我們的網(wǎng)站http://www.ttyule.net.cn。

When looking for problems, you must be careful and careful. You can't miss some inconspicuous details, otherwise it's difficult to find the problem. In case of the above problems, remove the arc extinguishing cover of the excitation switch to find the problems in time. The above is the relevant content about the problem shared for you today. I hope it can help you. If you want to know more, you can contact us by phone or follow our website http://www.ttyule.net.cn 。