Directional relay (Forward / Reverse) Set up 2

• Apr 12, 2024

• #2

davidbeach

Electrical

Mar 13, 2003

9,549

US

Throw in a bit of comms and run a POTT scheme between the ends. Or go with 87L. SEL has a new, relatively inexpensive (at least compared to the top end line diff) two terminal 87L for just such applications.

When one this sentence into the German to translate wanted, would one the fact exploit, that the word order and the punctuation already with the German conventions agree.

-- Douglas Hofstadter, Jan 1982

 

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• Apr 13, 2024

1
• #3

wcaseyharman

Electrical

Oct 31, 2022

336

US

It depends on when you want to trip for an overcurrent situation. For example, if the bus is equipped with differential protection I’d recommend setting it forward. If there’s no differential element on the bus, you would want to trip for both directions.

 

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• Apr 13, 2024

1
• #4

RRaghunath

Electrical

Aug 19, 2002

1,741

IN

The Directional relays are for fast clearance of any faults in the interconnector. Hence, the protection shall be set to look in forward direction at both ends of the interconnector, in other words looking away from the busbar and towards the interconnector.

R Raghunath

 

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• Apr 15, 2024

• Thread starter
• #5

NickParker

Electrical

Sep 1, 2017

455

NL

wcaseyharman said:

If there’s no differential element on the bus, you would want to trip for both directions.

Click to expand...

Are you suggesting to use non directional element if there is no differential protection?

 

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• Apr 15, 2024

• #6

wcaseyharman

Electrical

Oct 31, 2022

336

US

No, I was thinking too narrowly, the subsequent post made me realize my error. The main benefit I see by using directional is for a “through fault” (a fault that is not in that line but fault current is flowing for a fault nearby) only one of the two breakers will trip. That will likely make restoring service a little easier and faster.

 

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