Abstract
Online diagnosis methods for high-voltage (HV) cable faults have been extensively studied. Power cable fault monitoring is not accurate, and the degree of data fusion analysis of current methods is insufficient. To address these problems, an online monitoring method based on the locus-analysis for HV cable faults is developed. By simultaneously measuring two circulating currents in a coaxial cable, a two-dimensional locus diagram is drawn. The fault criteria and database are established to detect the fault by analyzing the changes of the locus characteristic parameters. A cross-connected grounding simulation model of a high-voltage cable is developed, and several faults at different locations are simulated. Fault identification is established based on the changes in the long axis, short axis, eccentricity, and tilt angle of the track. The simulation and field experiments show that this method can provide an increased amount of fault-monitoring reference information, which can improve the monitoring accuracy and provide a new approach to cable fault monitoring.
Highlights
Online diagnosis methods for high-voltage (HV) cable faults have been extensively studied
Cross-linked polyethylene (XLPE) power cables are widely used owing to their excellent insulation properties and heat resistance [1,2]
This study proposes an online monitoring method for HV cables based on the locus analysis, which is a solution for both discussed problems
Summary
Cross-linked polyethylene (XLPE) power cables are widely used owing to their excellent insulation properties and heat resistance [1,2]. Wei Zhao et al.: Online Monitoring Method Based on Locus-analysis for High-voltage Cable Faults various insulation parameters required to accurately and efficiently evaluate the cable status [13]. [16] proposed a method, which involved current circulation at one direct-grounding box, to solve the unbalance degree, similar to a fault diagnosis method. It effectively avoided influences on the diagnostic accuracy from grounding resistance and other conditions, it did not consider the current components. This study proposes an online monitoring method for HV cables based on the locus analysis, which is a solution for both discussed problems.
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