The Detection Technology Of Full Epoxy Resin Insulators Currently In Operation

The main detection technologies of the Director Quan high voltage standoff insulators in operation are:

Direct observation method

At present, the most commonly used method for external physical defects of composite high voltage epoxy is direct observation method, that is, using binoculars to observe under the tower to find common surface defects such as cracks, electrical corrosion, powdering, leakage traces, etc. in the sheath, shed, hardware and other parts. If the above phenomena occur, the insulation should be replaced immediately. However, ground observation is not reliable enough, and it is necessary to climb the tower for inspection, and it is difficult to find internal insulation faults such as tree-like channels.

Specific observation content is:

1. Observe the partial discharge of the surface of the composite epoxy resin insulator under meteorological conditions such as rain, fog and dew

2. Whether there is obvious slippage and accessory electrical corrosion at the connection of the end hardware.

Ultraviolet imaging method

Small but stable surface partial discharge will cause carbonization channels or electrical corrosion in the composite high voltage epoxy resin shed and sheath. When carbonization channels are formed on the surface of high voltage standoff, its service life will be greatly reduced, and it may even be broken down in a short time. The electronic ultraviolet optical flaw control instrument can be used to detect the carbonization channel and electrical erosion formed on the surface of the composite insulator due to partial discharge. The principle is that the charged particles will emit ultraviolet rays during the partial discharge process. When the conductive carbonization channel is formed on the surface of the insulator, the partial discharge is aggravated. The disadvantage of this method is that it requires operation at night and in a positive temperature environment; in addition, it requires that partial discharge is occurring during the detection, which requires that the detection should be carried out in an environment with high humidity or even rainfall. However, the detection results are easily affected by the degree of observation, and the detection equipment is also expensive.