Inducing unwanted voltages onto control wiring when a DC rectifier ramps up to steady state.
Inducing unwanted voltages onto control wiring when a DC rectifier ramps up to steady state.
(OP)
We are installing a large rectifier that converts AC power to 735VDC and 30,000A.
I'm looking at the how the control wires are shown coming into this rectifier. They are in very close proximity to this open DC bus, like within inches. The control wires are run from separate 120VAC and 24 VDC sources.
My question is when the rectifier is off and then re-started, the voltage obviously ramps up to it's DC voltage. With this many Amps, wouldn't there be a concern about inducing voltage onto the control wiring and perhaps giving false signals? The vendor doesn't state to use any special kinds of wires or any minimum distance requirements that I can find. Is this something to worry about?
I'm looking at the how the control wires are shown coming into this rectifier. They are in very close proximity to this open DC bus, like within inches. The control wires are run from separate 120VAC and 24 VDC sources.
My question is when the rectifier is off and then re-started, the voltage obviously ramps up to it's DC voltage. With this many Amps, wouldn't there be a concern about inducing voltage onto the control wiring and perhaps giving false signals? The vendor doesn't state to use any special kinds of wires or any minimum distance requirements that I can find. Is this something to worry about?






RE: Inducing unwanted voltages onto control wiring when a DC rectifier ramps up to steady state.
Has this OEM done such equipment before without problems with the same design?
rasevskii
RE: Inducing unwanted voltages onto control wiring when a DC rectifier ramps up to steady state.
Aside from separating the control wiring from the DC bus as far as possible, you can twist the control circuit wiring where it travels near the high current bus. Also, the type of control circuit (high vs low impedance, balanced vs unbalanced, etc.) will affect the circuit's susceptibility to interference. A low impedance, balanced circuit with high CMRR (common mode rejection ratio) will help. Pay close attention to grounding between the two ends of each control circuit. You don't want to create any large area loops that will inductively couple noise from the high current bus.