POWER LINE HARMONIC INDUCION TESTS.
COOKE ENGINEERING CO ALEXANDRIA VA
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Studies were conducted and measurements were taken to determine the degree of electro-magne tic energy coupling between power and control cables within the frequency range from 60 cycles to 5,000 cycles. A five kilowatt ac generator set was connected to permit a current of 44 amperes at 120 volts, 22 amperes at 240 volts, and 11 amperes at 480 volts to flow in a typical number six power cable. The control cable used for the measurements was RG-8U, installed parallel to and at various spacings from the power cable for a distance of forty feet. Wave analyzer techniques were employed for measuring the components of the power line energy which were induced into the control cable. Calcula tions from measurements reveal the attenuation afforded by cable spacing, and that afforded by steel and aluminum conduit. Author