Modelling of Stray-Load Loss for Medium Power Induction Motors

Kumar, Rajendra; Kumar, Praveen

doi:10.1109/iecon.2018.8591650

Cited by 11 publications

(1 citation statement)

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“…The induced lightning screen current impulse can be recognized thanks to the characteristic features of the waveform and very short duration in the range of µs [50] and therefore can be excluded from the earthing system analysis. It is also possible that in some cases additional screen earthing current sources will be active-stray current originating from traction or industrial loads [51]. Many stray current sources may be eliminated by filters since stray currents of traction loads are usually DC.…”

Section: Earthing System Current Sourcesmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Earthing System Current Sourcesmentioning

confidence: 99%