By end-use, voltage transformer is divided into two types of measurement and protection. Electromagnetic induction voltage transformer. It works the same transformer. The basic structure is the core and the primary and secondary windings. It is characterized by small capacity and relatively constant, close to the no-load condition during normal operation. Low impedance voltage transformer itself, once the secondary side short circuit occurs, the current will increase dramatically and burned coil. For this reason, the primary voltage transformer connected with a fuse opening transformer, the secondary ground, in order to avoid the former, when the secondary insulation damage, high potential for accidents caused by the secondary side appears. The same equivalent circuit electromagnetic induction voltage transformer equivalent circuit of the transformer. Capacitive voltage divider voltage transformer. Made on the basis of a capacitive divider. Capacitive coupling capacitor voltage transformer multi-carrier communication systems combined power to simplify the system and reduce the cost. At this point, it must meet the requirements of the communication on the run. Voltage transformer according to the structure classification, there are oil-filled and dry-type and three-core and single-phase five-column, as well as fully insulated and semi-insulating type. Transformer action are the following: the primary circuit of high voltage and high current becomes standard position of the secondary circuit, generally rated secondary voltage of 100V, rated secondary current is 5A, so that test site instrumentation and protection equipment standardization , as well as insulation level can be low voltage secondary equipment design, lightweight structure thus export transformers, cheap. All secondary equipment available low voltage, low current control cables, wiring within the screen simply a single, easy to install. At the same time, to facilitate centralized management of bamboo, it can be remotely controlled and measured. Secondary circuit is not a limit circuit. Can be Y-shaped, △ shaped or V-shaped connection, thus wiring flexibility. Meanwhile, the secondary equipment maintenance, as well as adjust the test replacement, without interrupting the operation of a system of zero-sequence current transformer secondary wiring appropriately changed only can be realized. The secondary equipment and staff and the high-voltage part isolated and transformer secondary side are grounded, thus ensuring equipment and personal safety. Nanjing transformer low-voltage current transformers _ _ Huayi Huayi power provided by the power plant in Xi'an. 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!