The hazard of transformer damp and the method of moisture prevention

Do you know what happens when the transformer gets wet? How to prevent this phenomenon? The following editor will explain that after the transformer is damp, the main insulation will deteriorate and the insulation level will be reduced; the transformer oil breakdown voltage is low; or it is caused by the expansion of other faults, such as the winding short circuit or ground fault, due to arcing and melting. The copper (aluminum) particles scattered and spattered, causing the accident to spread and expand and develop into a short circuit between phases. Or due to poor welding inside the wire, fusing due to overheating, or rupture due to short-circuit between turns, and winding breakage caused by short-circuit stress. Therefore, once the transformer installation environment is found to be relatively humid, moisture-proof treatment should be performed on the transformer, so as to prevent faults and accidents caused by the damp of the transformer. After the transformer is purchased, the power supply bureau should be asked to do a handover test immediately; a moisture absorber should be installed immediately, and all transformers with a capacity of 100 kVA and above are equipped with a moisture absorber. Once the transformer is shipped to the site, a moisture absorber should be installed immediately to prevent the internal body from being wet. Monitor the silica gel in the moisture absorber and replace it immediately when it becomes damp. The silica gel in the moisture absorber can absorb moisture and protect the transformer. The color of the silica gel will change after it is saturated with moisture, and a new dry silica gel should be replaced at this time. Note when ordering to minimize the storage time before the transformer is powered on. After the transformer is manufactured, it is extremely susceptible to moisture during storage. The longer the storage time, the more serious the moisture will be. Therefore, the plan should be arranged to shorten the storage time as much as possible. Small transformers with a capacity of 100 kVA and below, without a moisture absorber device. The oil in the oil pillow is easily damp, and the oil pillow accumulates water. If it has been stored for more than six months without power supply, or has been put into operation for more than one year, the oil in the transformer oil pillow has become severely damp. If you want to carry out lifting, transportation, maintenance and refueling, oil valve draining, lifting cores, etc., the dirty oil in the oil pillow should be drained through the oil drain plug under the oil pillow, and the dirty oil should be wiped with a dry cloth and sealed to avoid Make the dirty oil in the oil pillow enter the oil tank. During the operation of the transformer, always pay attention to the changes of oil level, oil temperature, voltage, and current. If there is any abnormal situation, analyze and deal with it in time. It is strictly forbidden to use aluminum stranded wire, aluminum bar, etc. to connect with the copper guide rod of the transformer when installing the transformer to avoid corrosion of the guide rod.