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Ken wrote:
"I have been told that wind will cause static charge to build on the magnet wire and that a path to ground must be provided." I`ve seen wind sweeping broadcast tower guy wires charge them until they flashed across their insulators again and again. That means the guy wire insulators were very good. a very small leakage is usually sufficient to discharge a conductor, but the guy wire is broken in several places with insulators. The voltage between segments was in kilovolts to produce corona and flashover. A resistance so low as 1000 ohms is usually much lower than required to drain charge. An ungriunded conductor in air will accumulate charge from rain drops, snow flakes, dust particles, and charged air which strikes it. Static drain can be accomplished by a connection to ground through a choke or transformer coil. A resistor so high in value as to not affect operation of the "magnet wire" also is effective. Operation may be compared with the grid resistor in a vacuum tube circuit which leaks the charge from a grid. In the case of an elevated conductor, megohms of resistance may be low enough to drain the charge, depending upon the charge accumulation rate and the kilovolts required to produce corona and flashover at some sharp projection on the charged surface. Best regards, Richard Harrison, KB5WZI |
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