IMPULSE NOISE ON POWER LINE CARRIER WITH REGARD TO PROTECTIVE RELAYING
Date
1970-05
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ORCID
Type
Degree Level
Masters
Abstract
There is a great demand for reliable, high-speed communication systems for use as protection links between individual line sections in power system networks. Protection signals are generally transmitted to selectively disconnect faulted line sections from the system. The transmission medium considered is the high-voltage line itself. This thesis investigates solutions to difficulties encountered during transients caused by switching operations, lightning discharges and malfunctions on the line. The total system
concept is presented and limitations on present facilities utilized are given. The underlying criterium for any system modification considered is that neither the reliability nor the security parameters of the communications link, which normally are at opposite ends of a balance, be sacrificed in order to improve either one.
Electrical impulse noise induced into the receiving system of a protection link by the operation of line disconnect switches was recorded. The amplitude and duration of each individual impulse combined with the impulse rate observed indicate that communication need not be interrupted during such noise occurrence. Yet high signal energy and receivers with wide bandwidths are preferred. Efficient methods of power, and bandwidth utilization are pointed out. Improvement possible in a commonly used FSK subcarrier signalling system is experimentally verified. The use of clipping and blanking techniques were analyzed to be desirable, however, tests on an existing power line carrier system were unsuccessful.
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Degree
Master of Science (M.Sc.)
Department
Electrical Engineering