What advantages do you get if you activate the overcurrent portions 50/51 on a multifunction relay when you already have trip units in the breaker?
Should the settings be the same on the protection relays as the trip units?
It is my understanding that multifunction relays are used for throwover schemes and that would be my reason to use them in leiu of discreet relays. However when it comes to selective coordination I am not sure if they should be the same trip settings or if they are even required as there is already protection in the form of trip units in the breaker.
Can anyone provide insight on this?
Should the settings be the same on the protection relays as the trip units?
It is my understanding that multifunction relays are used for throwover schemes and that would be my reason to use them in leiu of discreet relays. However when it comes to selective coordination I am not sure if they should be the same trip settings or if they are even required as there is already protection in the form of trip units in the breaker.
Can anyone provide insight on this?