The Development Of A Line-to-Ground Fault
Detection System For A DC Feeding System
On A Support Pole
Author(s)
M. Shimbo
Abstract
This paper presents the overview of a Line-to-Ground Fault Detection System of
a DC feeding system on a support pole and some test results of the detection
function. Sometimes, the voltage of lightning strikes can create closed circuits
around insulators, and a DC feeding system is grounded if the supports of the
overhead lines are made of steel. Existing protection systems on substations
cannot detect the accident because they cannot distinguish between the current of
train loads and the current of ground faults. Therefore the current of the ground
fault makes an arc around the insulators of the overhead lines. The arc heats the
overhead lines and they may be broken by tension. The breakage may occur
within 3.1 seconds and there is no conclusive method to prevent the accident.
Therefore, we developed a new system to prevent this kind of accident. A
detection device having a wireless communication device for transmitting
detected information is installed in each support pole. When the detection device
senses the ground fault, the information is transmitted by multihop
communication through some devices on support poles, and devices on
substation open circuit breakers to terminate the ground fault. To detect the
ground faults, Giant Magnetoresistance (GMR) sensors were selected. The test
results confirmed that the sensors had enough performance against strong
magnetic fields produced by the impulse current of lightning strikes. And the test
results also confirmed that the sensors could detect 300A of the line-to-ground
fault current on the support pole.
Keywords: line-to-ground fault, DC feeding system, magnetic field sensors,
GMR.
Keywords
line-to-ground fault, DC feeding system, magnetic field sensors,GMR.
Related Book
Other papers in this volume
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