Various factors influencing the electrical performance of baoding oil-immersed transformer are analyzed. Moisture exists in three forms in baoding oil-immersed transformer oil: deposition, dissolution and combination. The lower the water content in the oil, the higher the power frequency breakdown voltage. When the water content is greater than 200x 10-6, the breakdown voltage remains unchanged, because at this time, the excess water will sink at the bottom of the oil, which will not affect the breakdown voltage during the oil test.
The water content exceeds the saturated solubility, and the water is deposited to the bottom. The oil's compressive value is the same as that of the saturated solubility. The water content of oil has a great influence on the oil dielectric loss index and the electrical properties of solid insulation. With the increase of water content, the tgS value increases rapidly. Water increased, oil impregnated paper breakdown voltage value curve drops rapidly, when the moisture content is 3%, its electric strength fell about 10% for 500 kv oil-immersed transformer factory insulation paper moisture content control under 0.5%.
This situation must arouse the attention of the operation department of oil-immersed transformer. The water content of oil must be controlled within the required value.
Reducing the water content of oil plays an important role in improving the operation safety of oil-immersed transformers and slowing down the oil aging. In order to reduce the water content of the oil, the oil can be treated by vacuum heating. The oil temperature can be heated to 60~70 degrees and the vacuum can be pumped up to reduce the water content of the oil.
When suspended air bubbles exist in the oil, the gas and liquid interface, due to the different dielectric coefficient, the two interface electric field distortion will occur, and the electric strength of the gas low, can produce bubble discharge. Above level 60 kv oil-immersed transformer requirements for vacuum oil and let stand, finished product testing before processing, its purpose is to eliminate baoding oil-immersed transformer body internal and oil bubble, prevent bubble discharge in product testing. In addition, when the baoding oil-immersed transformer is put into operation, too much gas dissolved in the oil will be gradually discharged and concentrated in the gas relay, and the wrong action will occur.
The power frequency breakdown voltage of high quality baoding oil transformer oil can be improved by improving the uniformity of electric field. For oil containing impurities, under the impact voltage, impurities are too late to form a "small bridge", improving the uniformity of electric field can improve the oil pressure tolerance. The concentration and arrangement of impurities in the oil under the action of power frequency and pressure resistance distort the electric field, and the breakdown voltage is not significantly increased. In the production of manufacturing defects, such as product with metal foreign bodies, bubble, lead shielding, conductor and earthing have burrs, etc., affect the baoding oil-immersed transformer electric field uniformity, caused by partial discharge and breakdown voltage.
Take the following measures, such as increasing the core shielding, shielding lead good, electrostatic protection tube, coil plate, equalizing tank ball increase electrode radius of curvature measures, such as to improve the oil-immersed transformer electric field uniformity, not only narrow the insulation structure of insulation distance, and at the same time improve the quality of the product.
Billion in baoding electric materials co., LTD is specialized in the production of transformer baoding transformer factory manufacturers, with professional production equipment, hoisting, tooling and testing equipment, established a perfect quality management system, product performance indicators have reached the standard.
Main products: baoding dry-type transformer, baoding box-type transformer, baoding oil-immersed transformer, baoding high-low pressure complete set of equipment, etc. I companies to follow "detail decides success or failure, honesty molded the future" of the enterprise purpose, adhere to "quality measuring market, seek development by innovation, to management for efficiency" business philosophy, to make my company's products are widely used in power plant, chemical, construction, mining, metallurgy, rail transportation and other industries, to meet the needs of various users, my company rely on superior product quality, thoughtful service, won the trust of our customers.
