Stator winding operation temperature monitoring. In general, the temperature monitoring of stator winding is detected by thermometer. The manufacturer installs resistance thermometer in the slot and detects the temperature of the equipment through the thermometer. The monitoring process is to embed thermocouple with special wire rod and test the temperature through the heat conduction effect of thermocouple. Generally, the environment for temperature measurement is the thermoelectric temperature of winding under rated working condition The temperature at the highest temperature is 30 ℃ ~ 40 ℃ higher than that between bars in the slot.

定子繞組絕緣老化。定子繞組絕緣作用非常重要，其能夠起到減緩機械老化、減緩電老化、減緩承受熱老化的作用，此三者如果作用不好，則會讓設備的老化速度加快，對設備的長期使用產生損害。對于機械老化，企業在解決此問題的時候大多在端部應用環氧適形材料，通過玻璃絲帶加固，槽位進行毛氈墊條，雙側打緊槽楔，此方法能夠解一時的燃眉之急，但是經過多年的運行之后，其穩定性依然受到挑戰，尤其槽楔部分，松動明顯，需重新固定。對于電老化，其為絕緣體外表面的防暈結構，此結構對于端部和槽部的完善情況還有待改善，絕緣內部的空氣消除還沒有達到理想目標。對于熱老化，則主要考慮對其溫度的檢測，要注意溫度不要超過絕緣體所承受的值。

Insulation aging of stator winding. The insulation function of stator winding is very important, which can slow down the mechanical aging, electrical aging and thermal aging. If these three functions are not good, the aging speed of the equipment will be accelerated and the long-term use of the equipment will be damaged. For mechanical aging, when enterprises solve this problem, most of them apply epoxy conformal materials at the end, which is reinforced by glass ribbon, and the slot wedge is tightened on both sides. This method can solve the urgent problem, but after years of operation, its stability is still challenged, especially the slot wedge, which is obviously loose and needs to be fixed again. For electrical aging, the emphasis is placed on the anti corona structure on the external surface of the insulation. The improvement of the structure for the end and groove needs to be improved, and the air elimination inside the insulation has not reached the ideal goal. For thermal aging, the main consideration is the detection of its temperature, which should not exceed the maximum value of the insulator.

定子繞組絕緣污穢。當前階段，很多水輪發電機組內部都會出現積灰現象，常年使用所產生的油污也比較嚴重，積灰與油污的產生對于設備的運行影響較大，同時也會影響鐵芯的散熱情況，嚴重情況下還會引發火災事故。通常在檢修過程中，使用壓縮空氣吹掃，或者使用毛刷、白布與溶劑進行清潔，次清潔方式容易使設備清潔不到位，無法達到更本清潔的目的。

The insulation of stator winding is polluted. At the present stage, many hydro generating units will have ash accumulation inside, and the oil pollution caused by annual use is also relatively serious. The dust accumulation and oil pollution have a great impact on the operation of the equipment, and also affect the heat dissipation of the iron core, and even cause fire accidents in serious cases. Usually, in the process of maintenance, compressed air is used for purging, or brush, white cloth and solvent are used for cleaning. The secondary cleaning method is easy to make the equipment not clean in place and can not achieve the purpose of more clean.

4 發電機滅火裝置。現階段我國使用的滅火裝置大多為水器滅火，滅火設備也多為人為操作進行滅火。滅火應當為在發電機組管控設備出現跳閘情況，管理人員發現設備出現冒煙情況或者聞到有焦糊味道的時候，立即進行滅火操作。首先使用手動關閉滅火裝置的滲漏排水閥，之后打開供水閥，保證水源的充足供應，啟動消防閥，同時要對發電機的孔蓋和門進行關閉，給水延續到發電機下部蓋板已經漏水為止。但是當前階段對于供水閥、排水閥、消防閥的檢修不到位，在使用過程中發現閥門無法使用，引起火勢蔓延。

4 generator fire extinguishing device. At present, most of the fire-fighting devices used in our country are water extinguishers, and most of the fire-fighting equipment is manually operated. The fire fighting shall be carried out immediately when the control equipment of the generating set trips and the management personnel find that the equipment is smoking or smelling burnt smell. First, manually close the leakage drain valve of the fire extinguishing device, and then open the water supply valve to ensure the sufficient supply of water, and start the fire valve. At the same time, the hole cover and door of the generator should be closed, and the water supply should continue until the lower cover plate of the generator has leaked. However, at present, the maintenance of water supply valve, drain valve and fire valve is not in place, and it is found that the valve can not be used in the process of use, causing fire spread.