With the economic and social development of electric power, the safety and reliability of the operation put forward higher request. Data shows that: high voltage grid operation fault is mostly due to poor insulation, and high-voltage lines insulator is the weak link of high-voltage grid insulation. Therefore the operation condition ofinsulator were charged detection, to ensure safe and stable operation of the grid has important realistic significance.
Composite insulator to light weight, high mechanical strength, good pollution resistant, easy operation and maintenance etc in countries in the power system has been widely applied. But with the use of composite insulators lines of composite insulators, had appeared in the operation of all kinds of questions. These problems have caused all scholars and power system of personnel. Therefore, the study ofcomposite insulators insulation fault detection technology, reliable operation of the power is an impo1tant work to ensure safe operation of the power grid, has the extremely vital significance. The defects of composite insulators including inside and outside insulation insulation defects. Inner insulation defects in appearance is difficult to fmd, at the same time, they are the most dangerou defects, therefore, the difficulties of the compo ite insulator defects detection mainly lies in the inner insulation defects. This study of the inner insulation composite insulator defect detection methods. This also applies to the outer insulation composite insulator detecting defects.
At present, the detection of composite insulators in charged of technology research is very active, mainly by detecting technology: observation and ultraviolet imaging method, the method of infrared measuring temperature and electric waves,etc. General: infrared measuring temperature and electric method is satisfacto1 y in two ways.
The composite insulator electric decomposing along the longitudinal component and insulator along the radial direction, insulator radial electric components, the proportion of small negligible. Longitudinal electric component is about equal to the composite insulator electric field, in the longitudinal electric component can test the defects of composite insulators. No defect composite insulator electric intensit vertical component E along the axial insulator curve. The composite insulator field distribution is not uniform, highpressure electrode potential line near field for high dense, middle part, the distribution of electric field, electric voltage electrode near.Show "U" glyph. The composite insulator potential distribution is not uniform.
When the insulator intermittent existence defects (including sheath inf i11connective defects and mandrel, due to the defect of inconnective inf elect1i e field intensity E is the length of the potential, thus this vertical variation, electric field intensity will suddenly the electric fie ld distribution curve, but also no longer smooth in the corresponding position have aberration (middle), sink, ends, therefore, is measured by the longitudinal field distribution of composite insulators, can find the inner insulation composite insulator intermittent fault. When the insulator exists whenair gap (including sheath of air gap and mandrel air gap), in the external electric polarization, the local field air gap with different shapes ofair gap with different ratio increases, the airgap may occm ionization. So here's a longitudinal field intensity ill suddenly, the electric field distribution curve is not smooth, but in the corresponding position have distortion, the paper defects in setting for sheath triangle shape airgap defect , defects along the st11face condition of composite insulators electric distribution along the sutface potential distribution, without obvious changes here.
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