Water HeaterTransformerThe quality of insulation and the level of safe operation will directly affect the reliability of the entire power system. In our preventive testing, we focus on testing several data related to whether the transformer is wet, such as insulation resistance, absorption rate, polarization index, dielectric loss, winding leakage current, and analysis of water in oil. When we detect that the insulation of the transformer is damp by some technical means, two methods can be used to deal with the damp of the transformer.
Fine micro electronics recommended transformer damp solution:
The basic method of transformer drying off-line treatment is:heating and dehumidification, depending on the size and construction of the transformer. The heating and heating method of the transformer after drying on site can be iron loss or short-circuit iron loss and injection of hot oil. The immersion method was performed. There are two types of dehumidification methods: vacuum and non-vacuum. However, offline drying is easily limited by on-site conditions, is usually difficult to implement, and the power outage time is long, and it is also easy to cause abnormal aging of transformer insulation.
online processing method of transformer humidity:The no-load loss and load loss generated during the normal operation of the transformer are used as the heat source for the drying process of the transformer, and the moisture in the transformer insulation paper gradually penetrates. Transformer oil, use an online oil filter device to remove the transformer oil, and then the transformer oil enters the vacuum container through the inlet filter, and the transformer oil is sprayed out under the action of the vacuum pressure nozzle (in the vacuum container) , The absolute vacuum degree should be controlled1500 PaLeft and right), and use the pressure nozzle to spray the film to transfer the gas and water vapor to the air, thereby completing the degassing and dehydration process of the insulating oil.
The purified oil is collected at the bottom of the container, filtered by a filter element, and then refilled into the transformer. During operation, a container and corresponding valve should be installed at the bottom of the oil return filter to detect and discharge bubbles to prevent gas from entering the transformer. The treatment method of the online transformer body is damp, the power outage time is short, and the heat is uniform, which is not easy to cause the transformer insulation damage. When the safety measures are fully in place, the gas protection device of the processed transformer can be avoided.