11th IET International Conference on Developments in Power Systems Protection (DPSP 2012) 2012
DOI: 10.1049/cp.2012.0112
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Innovative injection-based 100% stator earth-fault protection

Abstract: Injection-based 100% stator earth-fault protection has been used for many years. However traditionally signals with frequency between 10Hz and 25Hz have been injected into the stator winding. To inject such a signal, either a dedicated grounding transformer with secondary grounding resistor or injection on primary side of the grounding circuit, is normally used. This paper will present a novel approach to such protection. Injection signal with frequency slightly higher than the power system rated frequency is … Show more

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Cited by 4 publications
(1 citation statement)
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“…This is of course not the case for on-line monitoring as there is mainly no other option than using the system voltage. The exception is possibly methods based on injection of a test signal into an energized test object, where the author has experience of a protection application based on a dielectric response approach [1]. Test signal injection requires however additional considerations and will not be discussed here.…”
Section: System Propertiesmentioning
confidence: 99%
“…This is of course not the case for on-line monitoring as there is mainly no other option than using the system voltage. The exception is possibly methods based on injection of a test signal into an energized test object, where the author has experience of a protection application based on a dielectric response approach [1]. Test signal injection requires however additional considerations and will not be discussed here.…”
Section: System Propertiesmentioning
confidence: 99%