Answer: When the power system resonates, there will be several times to dozens of times the rated voltage of overvoltage and overcurrent, porcelain insulator discharge, insulator, casing and other iron corona, voltage transformer fuse fuse, serious when will damage the equipment. Why can't the three-phase AC power supply line be threaded through metal pipes?

After receiving the accident notice, immediately go to the accident site and notify the electrical director to call relevant personnel to participate in the accident analysis meeting.

According to the GB/T5075-2001 national standard "power fittings terminology" definition: power fittings are metal accessories that connect and combine various devices in the power system to transfer mechanical load, electrical load and some protective effect.

Traditional current and voltage transformers are iron-core transformers, which have inherent weaknesses and limitations, such as small range, low precision, large weight, and a certain degree of insecurity. In the late 20th century, a new type of sensor was developed to replace the traditional mutual inductance (1) current transformer: the new type of current transformer mainly includes AC coil and optical current sensor. The optical current sensor has basically the same advantages as the AC coil, but the main advantages are large dynamic range, good performance, small size, no open circuit problem, and low cost.