Monitoring of MV Cable Screens, Cable Joints and Earthing Systems Using Cable Screen Current Measurements

Krzysztof Lowczowski,Jozef Lorenc,Zbigniew Nadolny,Andrzej Tomczewski,Jozef Zawodniak

doi:10.3390/en13133438

Abstract

The paper presents the possibility of using cable screen earthing current measurements for MV, single-core cable line monitoring. Cable screen earthing current measurement allows the condition of cable screen connections, degradation of earthing systems, and the earthing system integrity to be observed, which allows a condition based maintenance (CBM) strategy to be introduced for cable screens and earthing systems in MV networks. CBM allows the workload and failure rate to be reduced. Analysis of the condition of the cable screen and earthing system is carried out based on the cable screen earthing current trends and rapid changes of the current. The proposed system is integrated with a state of the art advanced metering infrastructure (AMI) and uses AMI data to calculate currents flowing through cable segments of the analyzed feeder. Additionally, a system which counts thermo-mechanical stresses associated with high current incidents in cable screens is proposed. The stresses are assessed using data from conventional protection relays and the ratio of currents in the cable core and cable screens. The stresses can be used as an indicator of the cable joint condition. The presented phenomena are studied carefully in PowerFactory software. Theoretical considerations are confirmed using measurements taken in the real MV cable line. Finally, the results of a SWOT analysis are presented and future research activities are outlined.

Highlights

Cable lines are very important elements of a power system which connect energy sources with electrical loads
Simulations are performed in the quasi dynamic simulation module, which allows simulations to be performed in the long term—days, months, and years [53]
Loads are simulated based on real load profiles recorded by advanced metering infrastructure (AMI) meters installed in Medium Voltage (MV)/LV transformer stations located in Poland

Summary

Introduction

Cable lines are very important elements of a power system which connect energy sources with electrical loads. Cable lines are reliable since, contrary to overhead lines, they are buried underground and naturally screened from atmospheric conditions. Because of the high reliability of cable lines, the share of the cables in power systems is increasing systematically. The reliability of the distribution system network is very important since loads connected to the distribution network consume approximately 77% of energy [1]. Cable line failures are difficult to repair since failures are not visible to the naked eye. In order to find the fault location, special tools have to be used

Objectives

Results

Discussion

Conclusion