This paper investigates switching surge overvoltages due to a section switchgear between coils and a feeding cable, and surge overvoltages due to a ground fault in the feeding cable. The maximum overvoltage due to switchgear closing is about 25 kV on the coil and 15 kV on the cable sheath. The coil overvoltage becomes greater as the source voltage reaches its peak. The overvoltages due to switchgear breaking are dependent on the breaking current and reach 115 kV on the coil and 15 kV on the cable sheath when the current is 50 A. The fault surge overvoltage is about 24 kV on the coil which is smaller than the switching overvoltage. On the other hand, the cable sheath overvoltage reaches 32 kV, which is the largest among various overvoltages investigated in this paper, and could result in sheath insulation breakdown. The coil overvoltage due to current breaking by a section switchgear may cause coil insulation breakdown when the breaking current is large. Both the coil and sheath overvoltages can be controlled to less than the insulation level by arresters.
Switching surge overvoltages on the feeding system of a MAGLEV train
Electrical Engineering in Japan ; 123 , 4 ; 58-66
1998
9 Seiten, 17 Quellen
Article (Journal)
English
Switching Surge Overvoltages on the Feeding System of a MAGLEV Train
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