Divided by an insulating medium voltage transformer: Dry voltage transformers: the ordinary insulating material impregnated insulating paint as an insulating high-voltage transformers Suizhou Which is good, more is used in low voltage level and below; pouring insulation voltage transformer: epoxy or Other casting molding resin composite material, is used in voltage level and below; oil-immersed voltage transformer: by insulating paper and insulating oil as insulation, is the most common type of construction used in voltage level and below; gas insulated voltage transformer : disposes insulated by a gas, is used in a high voltage level. Typically designed for measurement of low voltage transformer is a dry, high or ultra-high pressure-sealed gas insulated (such as sulfur hexafluoride) transformer is dry. Guss applies to 35kV and below voltage transformers, 35kV or more products are oil-immersed. DC transformer error measuring method: 1.5 ~ 3V battery to the positive terminal of the transformer primary winding to the high voltage transformer Which Xinxiang L1, L2 then negative, the secondary side of the transformer connected milliammeter K1 positive and negative poles K2 Anyang high voltage transformer Which is good, take a good line, it will close the K mA table pointer positive bias, pull milliammeter pointer after negative bias, indicating that the transformer connected to the battery positive terminal connected to the head and cents An end table is the positive terminal of the same polarity. 1.K1 the same polarity that transformer is minus polarity. Contrary to the above, such as pointers to swing plus polarity. Which Huaibei high voltage transformer _ Huayi Electric Power (certified) _ Xi'an high-voltage transformers supplied by Huayi power plant. Xian Huayi power plant (www.xahy.com) is a leader in Xi'an, high voltage circuit breakers, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Huayi power in leadership with the staff warmly welcome all inquiries negotiations to create electricity Huayi a better future.