@magnahelic1 If you lose the 125 VDC tripping supply, you've basically lost control of your circuit breaker -- a very bad situation. I've worked in a substation where this happened once. It's scary to consider that there is absolutely no protection (not even manual control from the substation control room!) until that 125 VDC power is restored!
Wait... CT steps-down current to safe level, but at the same time, the CT steps-up the voltage at its output to dangerously high levels. That high voltage is the force that tries to push the secondary current-5Amp in this case- across the air gap. Therefore, because of the dangerously high voltage at the CT secondary, CT should be shorted before opening its burden connections. Please confirm if my understanding is correct??
Incredibly effective. Thank you for providing insight on this!
So informative and help full for beginners. Thank you for sharing.
@magnahelic1 If you lose the 125 VDC tripping supply, you've basically lost control of your circuit breaker -- a very bad situation. I've worked in a substation where this happened once. It's scary to consider that there is absolutely no protection (not even manual control from the substation control room!) until that 125 VDC power is restored!
Brilliant Video
Very nicely done. Thanks for sharing this.
Really so informative, thanks dude!
Wait... CT steps-down current to safe level, but at the same time, the CT steps-up the voltage at its output to dangerously high levels. That high voltage is the force that tries to push the secondary current-5Amp in this case- across the air gap. Therefore, because of the dangerously high voltage at the CT secondary, CT should be shorted before opening its burden connections.
Please confirm if my understanding is correct??
very good series on protection relays, could you explain how the breaker is protected eg fail safe if you lose the 125v tripping supply?
sir why we use protection relays with current transformer as current transformer is designed for metering
incase of any fault how protection relay helps us
very informative (y)
dem shitty ge relays