Voltage transformer by magnetic circuit structure: single-stage voltage transformer: primary and secondary windings (can be set as desired with multiple secondary windings wound on a core, the core of our country and below ground. voltage levels are single-stage; cascade voltage transformers: primary winding turns into several identical units connected in series between phase and ground Xi'an transformers, each unit has a separate core having a plurality core, and the core with a high voltage transformer, the secondary winding (as required may be provided a plurality of secondary windings connected in a last cell in the voltage level of such common structure type;. Combined mutual inductance control: the voltage transformers and current transformers combined and formed integrally called modular transformers, there are the combination of electrical and supporting the production of transformers called modular transformer transformer error and error factors influence (. 1) CT excitation loss and errors due to magnetic saturation of the impact itself, I1 KNI2 in value and the measured value and phase difference were both ratio error and angle error error factors affecting primary current I1;.. I1 is small error is large so when I1 = (100-120%) I1e CT error minimization dimensioning and structure;.. the second load impedance; power factor; (2) PT error because of the excitation current and the impedance, the size of the measurement results and phase error are the same as the ratio error and angle error error factors core structure size;.. the secondary side load; power factor;. primary voltage range should be about the power factor and a secondary side voltage is limited to certain within the scope of Xi'an buy transformers on it, Huayi Electric Power (certified), transformers supplied by Huayi power plant in Xi'an, Xi'an Huayi power plant (www.xahy.com) is Xi'an, high pressure cutout the leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Huayi Electric Power leadership with the staff warmly welcome all inquiries negotiations to create a better Huayi Electric Power future.