Voltage transformer (PT) and current transformer (CT) is an important power system high voltage electrical equipment transformers, which bears the isolation between the high volume and high pressure, low pressure system to the low amount of conversion functions. The wiring is correct or not, the normal work protection, measurement, monitoring systems and other equipment has an extremely important significance. When newly installed PT, CT commissioning or replace PT, CT secondary cable, the polarity test method test PT, CT wiring correctness has been essential protection staff working procedures. Transformer burned reasons: 1, when the voltage transformer between the low side turn and white short-circuit high voltage transformer Chongqing Which is good, low insurance has not been blown, due to the exciting current increases rapidly, so that the high-pressure melt tube fuse is blown or burned mutual device. 2, when the qualifying 10kV single-phase ground, the voltage transformer primary side voltage is relatively non-fault root of 3 times the normal voltage. Voltage transformer core saturation quickly, exciting current sharply increased, so that the fuse is blown. 3, due to capacitive and inductive elements of power network parameters contain, in particular ferromagnetic core of the inductive element with high voltage transformers Lanzhou Which is good, cause ferromagnetic resonance when unfavorable combination of parameters. 4, zero-sequence current flowing through the transformer primary winding voltage increases (in terms of excessive relative to the ground current system), long-running, the thermal effect generated by the zero-sequence transformer will cause damage to the insulation voltage transformer, burst ; nonlinear oscillations (arc grounding overvoltage), greatly exacerbated the damage process system voltage transformer 5, the existence of the system; 6, voltage transformer itself is poor cooling conditions. Chongqing high-voltage transformer high-voltage transformer _ _ Which Huayi electricity provided by Xian Huayi power plant. Xian Huayi power plant (www.xahy.com) strong, credible, in Xi'an high-voltage circuit breakers and other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Huayi power and you hand into the brilliant, for a better future!