Several measures for maintenance of S11 oil-immersed transformer

1. Prevention of oil leakage: S11 oil-immersed transformers are filled with transformer oil in the oil tank, and the oil-resistant rubber components are pressurized and sealed by fasteners during assembly. Insufficient sealing is the main reason for oil leakage of transformers, so special attention should be paid to maintenance and maintenance. Whether the small bolts are loosened by vibration, if they are loose, they should be tightened. The tightening degree should be appropriate and should be consistent everywhere. Whether the rubber is broken or severely deformed. At this time, when replacing the rubber parts that can be updated, attention should be paid to whether the model and specifications are consistent, and the sealing surface should be kept clean.

2. Prevent the transformer from getting wet: The transformer is a high-voltage equipment, and its insulation performance is required to be kept good. S11 oil-immersed transformers are very susceptible to moisture, and preventing moisture is one of the main measures to maintain transformers. 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 a handover test immediately; a moisture absorber should be installed immediately, and the transformer with a capacity of 100 kVA and above is equipped with a moisture absorber. As soon as the transformer is transported to the site, a moisture absorber should be installed immediately to prevent the internal body from getting wet. Monitor the silica gel in the dehumidifier and replace it immediately when wet. The silica gel in the moisture absorber absorbs moisture and protects the transformer. After the moisture is fully absorbed, the color of the silica gel changes, and a new dry silica gel needs to be replaced at this time. When ordering, it should be noted that the storage time of the transformer before power transmission should be minimized. After the transformer is manufactured, it is very easy to get wet 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 dehumidifier device. oil pillow

The oil inside is easy to get wet, and the oil pillow accumulates water. If it has been stored for more than six months without power transmission, or has been put into operation for more than one year, the oil in the transformer oil pillow has been seriously damp. If you want to carry out lifting and transportation, maintenance and refueling, oil valve draining, lifting core, etc., you should first drain the dirty oil in the oil pillow through the oil drain plug under the oil pillow, and wipe it with a dry cloth and seal it well to avoid Let 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, it should be analyzed and dealt with in time. When installing the transformer, it is strictly forbidden to use aluminum stranded wire, aluminum row, etc. to connect with the copper guide rod of the transformer to avoid corrosion of the guide rod.

3. Transformer oil change and drying treatment: The transformer has been idle for a long time, the operation time is too long or other natural and human factors, resulting in the phenomenon of transformer insulation decline, internal water or oil quality deterioration, etc., the transformer must be replaced at this time. and drying process. Transformer oil change: first lift out the body, drain the dirty oil and clean the oil tank. If there is oil on the body, it should also be washed. After the body is dry, inject new oil and replace all oil-resistant rubber seals. After passing the test, it can be connected to the network and run. Transformer drying treatment: There are many methods of drying the body. Users can use zero-phase sequence drying method, eddy current drying method, short-circuit drying method, oven drying method, etc. when drying by themselves. For transformers with larger capacity and voltage of 35 kV, it is best to send them to the manufacturer for vacuum drying.

In this way, the insulation of the transformer can be guaranteed to be completely dry, and the insulation will not be aged. 2. Installation, use and maintenance of box-type substations The installation, acceptance, handover test, commissioning, operation and maintenance of prefabricated substations should comply with the regulations required by the power department. The following items should also be paid attention to: 1. The user should check carefully according to relevant regulations when receiving the goods. For products that are not installed immediately, they should be stored in an appropriate place according to the normal conditions of use. 2. The product shou