Overhead Line Fault Indicator Take Repair Measures To Restore The Normal Operation Of Power Lines
Overhead Line Fault Indicator is caused by a variety of reasons caused by a sudden interruption of power supply, the accident appears, only the first to find the accident point and determine the type of accident in order to find the cause of the accident and take repair measures to restore the normal operation of power lines and prevent future Similar to the accident.
Transmission line fault common transmission line wind flashover fault, lightning trip, lightning broken shares, line ice failure, line pollution flashover, line external damage failure, line bird damage and so on.
Distribution network in the operation often failure, most of the short-circuit fault, a few is broken line failure.
Short circuit refers to the phase or phase or between the ground connection, which includes three-phase short circuit, three-phase short-circuit, two-phase short circuit,Overhead Line Fault Indicator two-phase short-circuit ground and single-phase short-circuit ground.
The main reason for the short circuit is the same insulation or relative insulation is damaged, such as insulation breakdown, metal connections, etc.
Short circuit not only in the loop to produce a large short-circuit current, resulting in a large thermal effect and electric effect of the root,Overhead Line Fault Indicator thus damaging electrical equipment, and short circuit will cause the power network voltage drop, near the short-circuit point closer to the voltage drop, The normal power supply
(1) single-phase ground.
Line single-phase point to ground insulation damage, the phase current through this point into the earth, called single-phase ground. Single-phase grounding is the most common opportunity in the electrical fault. Its main hazard lies in the destruction of the three-phase balance system. The voltage of the non-fault phase can cause the failure of the non-fault phase insulation,Overhead Line Fault Indicator Three-phase short-circuit ground.
There are many factors that cause single-phase grounding,Overhead Line Fault Indicator such as the disconnection of a phase wire, the twist and the wire, the jumper due to the discharge of the pole against the tower, the insulator of the support or fixed wire, the insulation breakdown of the arrester.
(2) two-phase short circuit.
Line between any two phases caused by direct discharge called two-phase short circuit,Overhead Line Fault Indicator will make the current through the wire than the normal increase in many times, and in the discharge point to form a strong arc, burn the wire, resulting in interruption of power supply.
Two-phase short-circuit, including two-phase short-circuit ground, than the single-phase ground situation is much more serious.
Two-phase short circuit for the reasons: mixed, lightning, external damage and so on.
(3) three-phase short circuit. In the same place in the line three-phase direct discharge called three-phase short circuit.
Three-phase short-circuit (including three-phase short-circuit grounding) is the line of the most serious electrical failure, but it appears less chance.
Three-phase short circuit of the reasons are: mixed line,Overhead Line Fault Indicator line with ground line, the line caused by three-phase inverted bar and so on.