Generator carbon brush fire how to deal with?
Carbon brush and slip ring should be inspected every day. Main inspection items are:(1) the wear length of carbon brush should not exceed 2/3. When the wear length of the carbon brush exceeds the 2/3 (i.e. the top of the carbon brush is at the same level as the top of the brush holder), it must be replaced.(2) carbon brush without sparking. When the carbon brush starts to spark, you must find out the reason and remove it in time.(3) there is no offset slip ring outside the carbon brush, and the edge of the carbon brush is not cracked.(4) the brush brush is connected with brush holder and carbon brush, without heating and touching brush holder.(5) the carbon brush has no pulsation, shaking or sticking in the brush holder.(6) regularly measure the current of each carbon brush evenly with the DC clamp type meter, and measure the carbon brush with the infrared thermometer. If abnormal, it should be replaced in time.(7) the spring pressure is normal, without deformation and fracture. Normal, the pressure on each carbon brush should be uniform and stable, the unit pressure is usually between 1.1kg ~ 2.5kg, the uneven pressure difference between the carbon brush should be less than 5%.(8) the distance between the brush holder and the slip ring conforms to the specified value. Distance between brush holder and slip ring of generator: 2.5 ~ 3 mm, distance between main brush holder and slip ring: 2~4 mm.
From the following points: 1. check out whether the brush length is too short to cause the lifeline, the pressure is too small not brush contact ring; 2. check the spring pressure pressure is appropriate, if too small will lead to jump 3. check slip ring brush discharge; surface finish, if too much hair will increase the brush contact resistance of spark; 4. check the rotor electrical resistance, ensure the normal, no inter turn short; 5. check whether the oil bearing gap is too large, resulting in rotor slip ring brush runout, radial runout check slip surface is too large. The brush spark causes sparks; 6., whether the brush is the same as before, the brush has a requirement for the conductive current and the friction speed. Precautions
Generator is DC or AC, DC generator carbon brush ignition, then the coil is short circuit, to find a short separation, just fine! AC generator carbon brush ignition, then the carbon brush is not good to change it, there may be carbon brush in front of the copper ring is too dirty, with sandpaper sand just fine.
