Thread-topic: Low Pass Filter MOVs for Pole Transformer
I have been successfully operating my pole transformer powered SGTC for about 6 months. It utilizes a 3600 RPM RSG and has a protection gap. Current wall power is about 4800 watts. I want to add some additional protection by incorporating a low pass filter ("Terry" filter). I am in the process of building it now. I am using a 500 ohm wire-wound resistor and a 400 pF doorknob capacitor for each HV leg. I picked 500 ohms to minimize power dissipation. I want to eliminate the MOVs even though I have them. The reason that I want to eliminate the MOVs is because MOVs are really intended for only occasional use and have a limited life time. I think my protection gap should be adequate for protecting the pole transformer from over-voltage.
Are there any thoughts on the MOV elimination?
Steve
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