Application Of Technology To Put The AC On High-voltage Cables Over Test Site And The Bureau Of Pressure

Due to urbanization, high voltage cable length and longer, more and more cablecapacitance to ground, making the transfer of cable test equipment required to withstandincreasing capacity. Currently more than110kV power cables in Foshan of217kM, thelongest cable reached9.8kM, Foshan Bureau existing limit voltage test equipment testcapacity has been reached. If the cable is longer, the existing test device has been unableto meet the needs of cable transfer trials.Meanwhile " works of electrical installations electrical equipment over test "requirements of the new cable needs to be completed AC voltage test, but the ACvoltage test only concerned with the overall cable test voltage can withstand the test ofintegrity, lack of cable may occur during the test the local damage and destruction ofmonitoring tools. The internal cable is still possible existence of local defects throughthe discharge AC voltage test, if the internal operation of a defective cable sick, wouldthe safe operation of the power grid at risk.Therefore it is necessary to high-voltage cables AC voltage test PD detectiontechnology combined with high-voltage cables, insulated cables thus a morecomprehensive assessment of the cable pressure and partial discharge test techniques toimprove and upgrade, in order to ensure grid safe operation.In this paper, high-voltage cables for AC voltage test methods found deficiencies inthe cable defect through research and test, pressure test device to enhance the capacity tomeet the testing needs of large-capacity long cable; proposed external AC voltage inhigh voltage cable testing PD monitor pressure test to avoid damage to the cable;through the establishment of the laboratory simulation of the circuit and build model tostudy the time-domain signal interference with cable scene itself PD signalfrequency-domain waveform and polarity characteristics, summarized a set ofhigh-voltage cables suitable site PD detection and methods of diagnosis.In the high-voltage cable AC voltage withstand test, the use of partial dischargetesting techniques comprehensive monitoring insulated cable, the cable can beeffectively found inside the PD signal. In practice, the application method, the new110kV high voltage cable laying to detect defects discovered high voltage cable terminaland the disintegration of the cable through to verify the accuracy of the test results,indicating that this technique works well, can be used as high-voltage cables PD atechnical means testing the cable for the transfer of customs inspection, improve thequality of cable management is important.