Abstract
For 110 kV and above tunnel-installed high-voltage (HV) cross-linked poly-ethylene (XLPE) cable systems, it is a normal procedure to adopt a cross-bonding scheme. The high-frequency current method is frequently used in the cross-bonded cable systems for on-site or online partial discharge (PD) detection by monitoring the signals on the cross-bonding wires. To further study the amplitude distribution characteristics of the PD signals, a parametric characteristic admittance model of a three-phase cable system in a tunnel is established based on Tylavsky’s formulas. The model is used to calculate the amplitude distribution formula of the PD pulse current on the cross-bonding wires. In addition, the influence of cable laying and tunnel environment on the amplitude distribution is also studied. Finally, the correctness of the model and the conclusion are verified by simulation experiments and on-site tests. The results show that the signal amplitude distribution is determined by the ratio of the characteristic admittances. As the distance between the cables and the distance from the inner wall of the tunnel increase, the amplitude difference gradually decreases.
Highlights
Partial discharge (PD) is an important characterization of the insulation defects in cross-linked poly-ethylene (XLPE) cables [1,2,3]
Through on-site or online detection of PD signals, the state of the XLPE cables can be evaluated without power supply interruptions, which can help find the early degradation of the cable as soon as possible, improving the reliability of the power grid [4,5,6,7]
The smaller the cable spacing, the closer the cable is to the inner wall of the tunnel, the greater the difference in the amplitudes of the signals on the cross-bonding wires
Summary
Partial discharge (PD) is an important characterization of the insulation defects in cross-linked poly-ethylene (XLPE) cables [1,2,3]. A characteristic admittance model of three-phase cable systems is established based cross-bonding wires is obtained On this basis, the influence of parameters such as tunnel radius, earth on Tylavsky’s formulas, and the formula of the amplitude distribution of PD pulse current on resistivity, cable center spacing, and the distance between the cable and the inner wall of the tunnel is cross-bonding wires is obtained. The influence of parameters such as tunnel radius, earth on Tylavsky’s formulas, and the formula of the amplitude distribution of PD pulse current on resistivity, cable center spacing, and the distance between the cable and the inner wall of the tunnel is cross-bonding wires is obtained On this basis, the influence of parameters such as tunnel radius, studied. The three-phase cableofcan be regarded Cables as a transmission line system consisting of 6 conductors
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