I've got an old school circuit breaker with separate open and close 24VDC interposing relays to accept 3rd party control of the circuit breaker.
We are experiencing momentary (1-5ms) drops on the open circuit (fail safe) causing the circuit breaker to open. No open command is given, can't see voltage drop issues on the 24VDC circuit, no ground noise, nor anything obvious through extensive troubleshooting, including a scope on the circuits during the events.
We're looking at adding a capacitor across the relay to hold in the relay during these momentary drops, but not hold it long enough to cause any protection coordination issues. Not sure we're going with this solution, but I'd like to look into this solution as a backup. It's been 15 years since I've sized something like this and need your help sizing or providing additional solutions/technology that could assist with this.
Hold over time ~30ms
Dissipation time ~1s.
We are experiencing momentary (1-5ms) drops on the open circuit (fail safe) causing the circuit breaker to open. No open command is given, can't see voltage drop issues on the 24VDC circuit, no ground noise, nor anything obvious through extensive troubleshooting, including a scope on the circuits during the events.
We're looking at adding a capacitor across the relay to hold in the relay during these momentary drops, but not hold it long enough to cause any protection coordination issues. Not sure we're going with this solution, but I'd like to look into this solution as a backup. It's been 15 years since I've sized something like this and need your help sizing or providing additional solutions/technology that could assist with this.
Hold over time ~30ms
Dissipation time ~1s.
