Verification Test Of Fault Locator On A 6.6 KV
Power Distribution Line
Author(s)
Y. Mitoma, H. Yoshizumi, S. Uematsu, T. Ishii, K. Amano
& T. Tanaka
Abstract
When a ground-fault problem occurs on a 6.6 kV power distribution line, it is
essential to locate the fault point immediately and restore power to that line as
soon as possible. However, in a combined system of both insulated wires and
cables, surge signals could be affected by attenuation and reflection at both
connected points and branch points, making an accurate determination of the
fault point more difficult. Moreover, the surge signals of a 6.6 kV ungrounded
power line are smaller than those of an ultra-high voltage grounded power line,
further making it difficult to detect surge signals. Therefore, we have developed
the fault location system and conducted verification tests on a fault locator on a
6.6 kV power distribution line. The ground-fault point is detected by measuring
surge voltage propagation at both ends of line utilizing both noncontact voltage
sensors and GPS (Global Positioning System) synchronizing technology. We
found it important to acquire the first arrival surge and determine the surge
traveling speed. These two points are key factors in improving the accuracy of
the fault locator. First of all, as the power line produces much base noise, we
have difficulty acquiring the first arrival surge. To solve this problem, we
succeeded in developing a differential amplifier which improved the S/N (Signal
/Noise) ratio. Secondly, we have established a method of calculating the fault
point and the surge traveling speed from the switching surge in the combined
insulated wire and cable system. In conclusion, we have conducted verification
tests, enabling us to detect the fault location with an error rate ranging from
278 m to 363 m (3%) at a distance of 12.258 km. We are continuing work to
improve the system.
Keywords: fault locator, 6.6 kV power distribution line, surge signal.
Keywords
fault locator, 6.6 kV power distribution line, surge signal
Related Book
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