How to maintain oil immersed power transformer
Writer： Hengfeng you electric Time：2023-04-12 views：times
The protection and maintenance of oil immersed power transformer has always been an urgent problem for many transformer users. Although dry-type transformer has advantages over oil immersed transformer, oil immersed power transformer has its own unique advantages if it is properly protected and maintained. So, what measures should be paid attention to in the protection and maintenance of oil immersed power transformers? Qingdao hengfengyou electric power will give you some advice!
What are the protection and maintenance methods of oil immersed power transformer?
1. How to prevent transformer from moisture: transformer is a high-voltage equipment, and its insulation performance is required to be good. Oil immersed transformer is very susceptible to moisture. Preventing moisture is one of the main measures to protect and maintain transformer. To this end, users are required to pay attention to the following matters: after the transformer is purchased, the power supply bureau should be asked to do an explanation experiment immediately; Moisture absorbers shall be installed immediately, and those with transformer capacity of 100 KVA and above shall be equipped with moisture absorbers. As soon as the transformer is transported to the site, a moisture absorber shall be installed to prevent the internal body from being wet. Monitor the silica gel in the moisture absorber and replace it immediately after moisture. The silica gel in the moisture absorber can absorb moisture and protect the transformer. After wet absorption, the color of silica gel changes, and a new dry silica gel needs to be replaced.
2. Prevention of oil leakage: the oil immersed transformer is filled with transformer oil in the oil tank, and the oil resistant rubber elements are pressurized and sealed by fasteners during assembly. Lax sealing is the main cause of transformer oil leakage, so special attention should be paid in protection and maintenance. Whether the small bolt is loosened by vibration. If it is loosened, it shall be tightened. The tightening degree shall be appropriate and consistent everywhere. Whether the rubber is cracked or deformed. When replacing the renewable rubber parts, pay attention to whether their types and standards are consistent, and keep the sealing surface clean.
When ordering, we must pay attention to minimize the storage time before transformer power transmission. After the transformer is manufactured, it is very susceptible to moisture during storage. The longer the storage time, the more severe the moisture. Therefore, the scheme should be arranged to shorten the storage time as far as possible. Small transformer with capacity of 100 KVA and below, without moisture absorber device. The oil in the conservator is susceptible to moisture, while the conservator has accumulated water. The oil in the transformer conservator has been seriously affected by moisture if it has been stored for more than six months without power transmission or put into operation for more than one year. In case of lifting, transportation, maintenance and refueling, oil valve oil discharge, hanging core and other operations, the dirty oil in the conservator shall be discharged through the oil drain plug under the conservator, wiped and sealed with a dry cloth to avoid the dirty oil in the conservator from entering the oil tank
How to maintain oil immersed power transformer
During the operation of oil immersed power transformer, always pay attention to the changes of oil level, oil temperature, voltage and current. In case of any abnormality, analyze and deal with it in time.
During the installation of oil immersed power transformer, it is strictly prohibited to connect aluminum strand, aluminum bar, etc. with the copper guide rod of the transformer to avoid corrosion of the guide rod.
3. Oil change and boring treatment of oil immersed power transformer: the transformer is idle for too long, the operation time is too long, or the influence of other natural and human factors, resulting in the decline of transformer insulation, internal water inflow or oil quality deterioration. At this time, the transformer must be changed and bored.
Oil change of oil immersed power transformer: lift out the body first, drain the dirty oil and clean the oil tank. If there is oil stain on the body, flush it. After the body is dried, inject new oil and replace all oil resistant rubber seals. After passing the test, the network can be hung for operation. Dry treatment of transformer: there are many drying methods for transformer body. Users can use zero phase sequence boring method, eddy current boring method, short circuit boring method, oven boring method, etc. For transformers with large capacity and voltage of 35 kV pole, it is recommended to send them to local power manufacturers for vacuum drying. This can ensure that the transformer insulation is dry and complete without aging the insulation.
The above is the protection and maintenance method of oil immersed transformer. If you want to know more about oil immersed transformer, you can click the link of email for consultation, or contact the engineer of Qingdao hengfengyou transformer manufacturer: + 86 15853252696 for consultation!
