1. The moisture absorber is boring. The moisture absorber is also known as the "breathing apparatus", which is to remove and dry the impurities and moisture in the air that enters the oil storage tank because the transformer temperature changes to ensure the insulation strength of the transformer oil. According to the structure of the moisture absorber is divided into two categories: hanging type and seat type. After the connecting tube is installed under the oil storage tube, the moisture absorber is equipped with 2.7-7mm granular silica gel (also useful activated alumina), and the lower part is equipped with an oil container for filtering and removing impurities and moisture in the inhaled air. When the silica gel is damp to a certain extent, it is generated from blue to pink. The dry treatment method of silica gel after moisture is: dry 4-6h at a high temperature of 120-140 ° C, so that the water transpiration becomes blue. The dehumidifier is used according to the capacity of the filled silica gel and the weight of the transformer.
2, heating heating and drainage. According to the different capacity and structure of the transformer, the method of heating and heating when the transformer is dry on site can be carried out by using the method of oil tank iron loss or short-circuit iron loss and hot oil spray. The drainage method is divided into two kinds: vacuum pumping and non-vacuum pumping. However, this kind of dull processing is easily constrained by site conditions, often difficult to implement, the demand for a long time power outage, but also easy to cause the abnormal aging of transformer insulation.
3, use the no-load loss and load loss occurred during the normal operation of the transformer as the heating source of the boring treatment of the transformer, the moisture in the transformer insulation paper gradually permeates into the transformer oil, the use of online oil filter equipment to remove the moisture in the transformer oil, and then the transformer oil enters the vacuum container through the import filter, the use of vacuum pressure nozzle effect will spray the transformer oil, By using the pressure nozzle to spray the gas and water vapor in the oil film into the air, and then complete the degassing and dehydration process of the insulating oil. The purified oil is collected at the bottom of the container and filtered through the filter element before being injected into the transformer from scratch. During operation, a container and corresponding valve should be installed in the lower part of the oil return filter to detect and discharge bubbles to avoid gas entering the transformer. This treatment method has the characteristics of short power outage time, uniform heating, not easy to cause transformer insulation damage, and can avoid the gas maintenance misoperation of the treated transformer under the condition that safety measures are fully in place.
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