In AC circuits opening transformer, common transformer to a high voltage into low voltage and zero-sequence current transformer, a large current into a small current, thereafter for measurement, control and protection. This will not only increase the measuring instrument from the process, to facilitate standardized instrument to reduce control, protection of voltage and current of the device, and the instrument and equipment or high-voltage circuits are separated to ensure the safety instruments, equipment and staff. Transformers Classification: By function: voltage transformer: If JDZ series current transformers: as filling material in accordance with points LZZB series: Oil transformer: Internal filled transformer insulating oil dry: according to internal filled epoxy closed or semi-closed transformer rating: As part of the claw-shaped JDZ transformer, terminals and other exposed, the other part is closed. Fully enclosed transformer: the body is closed up. Voltage transformers, transformers Harbin, Xian Huayi Huayi electricity supplied by the power plant. Xian Huayi Electric Power Equipment Factory (www.xahy.com) strong, credible, in the Xi'an high-voltage circuit breakers and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Huayi electricity into the brilliant and you work for a better future!