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The paper explains the necessity of the development of additional technical requirements for medium voltage vacuum circuit breakers (VCB). Based on experimental investigations, possibility of significant difference in electrical and mechanical characteristics for VCB of various manufacturers is stated. It is shown that associated parameters of electrical and mechanical transient processes at VCB switchings...
The paper presents methods of accurate determination of single phase-to-ground currents, advantages and disadvantages of these methods, and general requirements to the measuring equipment used in oscillography of transient processes at single phase-to-ground faults. These methods have been tried in operational 6–35 kV networks for 8 years. Experimental investigations allow doing research of main parameters...
This paper deals with the combined method of neutral grounding when a high-value resistor is continuously connected to a neutral in parallel with a Petersen coil. Monitoring of processes at single phase-to-ground faults was organized in the 6 kV network of the large-scale iron and steel plant. Within the investigation, more than 200 oscillograms of phase-to-ground voltages were analyzed. Based on...
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