The high voltage through-wall bushing is suitable for the three-phase AC system power station and the distribution device of the substation with a rated voltage of 10KV-35KV. The role of the high voltage wall bushing is to act as an insulating support and a fixed connection between the external wires. High pressure wall casing is divided into indoor high pressure wall casing and outdoor high pressure wall casing. The indoor casing is suitable for temperature between -40-40℃, and the outdoor casing is suitable for temperature between -40-40℃.
The high pressure wall casing is mainly composed of porcelain parts, metal accessories, flanges and conductive rods. When the phenomenon of partial discharge occurs in the high-voltage wall bushing, it should be insisted that there is no local shedding of aluminum layer in the flange or inner cavity, if found, timely measures should be taken. For the high pressure through the wall casing need to be repaired regularly, how to check the high pressure through the wall casing problems?
Here, it is necessary to carry out a medium loss test, which is a highly sensitive test, which can detect the defects such as moisture and deterioration of the high-pressure wall casing, and can also find the defects that are not easy to find. When conducting dielectric loss test, the main connection is reversed.
The following matters should be noted during the test:
1, before measurement, polish the wiring of the high pressure through the wall sleeve to reduce errors;
2, before the experiment to measure and record the ambient humidity and temperature, check whether the wiring is correct;
3, after the end of the test to discharge in time, after the discharge can be removed.
