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Research on XLPE Power Cable Main Insulation Conditioning Monitoring and Measuring Methods

Author: WuYunFei
Tutor: ChenJunWu
School: Huazhong University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: AC voltage test Resistive current Capacitive current compensation method AC voltage superposition Online monitoring
CLC: TM247
Type: Master's thesis
Year: 2005
Downloads: 592
Quote: 2
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Abstract


The first part of the frequency AC voltage XLPE power cable facilities processing the resistive current detection research: found work through a large number of test frequency AC voltage test insensitive to mechanical damage of the main power cable insulation resistance by detecting the leakage current sexual component to the new method of detecting the main power cable insulation defects. Capacitive current compensation method is a general method to detect resistive current design based on capacitive current compensation method resistive current detection test circuit in the power cable, and have done a lot of trial and got a lot of useful data from these data seen the the resistive current size of power cable insulation defects detected are very different, so you can come to this conclusion: the capacitive current compensation method can accurately detect resistive current, power cables by detecting The resistive current of the main insulation can be effectively found that the various defects of the cable. The main insulation of XLPE power cable performance monitoring is the resistive component of the total leakage current in XLPE power cable running through a dedicated resistive current tester to determine, in accordance with the changes of the resistive component of the health of the cable. XLPE power cable resistive current tester strict principle, can compensate for capacitive current harmonic component can get the the resistive current waveform and peak and total harmonic voltage power. The second part of the AC voltage superimposed line detection of the main insulation design: based on the superposition of AC voltage XLPE cable insulation line detector, detector includes both hardware and software, the hardware part of the technology lies in 1Hz nA-minute deterioration signal measurements during charging detection, be subject to the interference of the frequency signal, the high-frequency signal and a line stray capacitance. The entire software monitoring system includes a the main insulation monitoring system and the metal sheath insulation monitoring system. It can live line measurement of the condition of the cable insulation to determine whether the cable continues to run, and online monitoring of the main cable insulation condition, which can greatly reduce the power outage maintenance test requirements. AC voltage is superimposed law in regard to the other line detection method for the main insulation of XLPE cables, the measurement of the cable main insulation performance Status obvious advantages, the main measurement is simple and can be electrically charged of measuring or online monitoring, anti-interference ability, high accuracy outstanding advantages.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Conductive materials and their products > Power cable
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