Current Differential Vs Distance relay

[dfdt]

Can someone explain why distance relaying is generally faster than line current differential scheme for in zone faults.

 

[davidbeach]

No need to wait for communications from the other end.

 

[dfdt]

thanks David

 

[odlanor]

current differential scheme is a unit-protection.
distance relaying needs telecommunication to be a unit-protection.
I did not understand David post.

 

[dfdt]

What David meant was that in order to make a Trip or Restrain decision, the current diff scheme must wait to receive information packets from the remote end via comms. network which could either be via multiplexer or direct fibre

 

[cranky108]

Assume this is line differential, and not bus or transformer differential.

 

[ScottyUK]

Check the OP. ;-)

 

[odlanor]

Sorry for my ignorance. What do you mean: Check the OP?

 

[waross]

OP> original poster or original post.


Bill
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Jimmy Carter