Aerial insulated cables _ Xi'an overhead cable insulation overhead cables _jklgyj

Why overhead insulated cable line will be charged a zero, zero conductor is not reflected properly grounded, if well grounded, the current flows underground, electric table will not be detected. In short, as the two upstairs said, either zero line is broken, or is a bad contact. However, this is actually the result; it is not zero conductor reasons; 2 reasons: Under normal circumstances, the zero line should not have electricity. So, if there is electricity, it is certainly the fault of the performance; the simplest is electromagnetic induction, and this time the zero line is not properly grounded, unable to form a loop; secondly, electrical equipment leakage or phase shell hit, but the current is not too large , it is also not trip; Summary: Neutral charged, the zero line is certainly not a good grounding; resolved after the device to look for reasons. Overhead insulated, superior quality secure overhead cable insulation system in use to protect access to zero, and also to work in power neutral ground and in a certain separation distance and terminal repeat ground zero line. In the three-phase four-wire distribution system, the grounding device called a direct connection to earth grounding distribution transformer secondary neutral through. The power neutral ground, can reduce the per-phase power supply voltage to ground when a person touches a phase power, the body is subjected to phase voltage. In ungrounded systems, when one phase is grounded, the human touch another phase lines, the effect on the human body is the line voltage power supply, which is a great danger. Aerial insulated cables while neutral grounding distribution transformer for use to protect access to zero provided the prerequisites. Grounding grounding resistance must not be greater than 4Ω.