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sauravbabu
Power-User
Engineering Fields - Electrical Engineering - New Member

Join Date: Dec 2009
Posts: 247

Distance Relay Fundamentals...

01/30/2013 1:38 AM

HI,

As I understand, distance relays are used on transmission lines usually. I have a hydroelectric project, which evacuates power through single circuit 500 metre 11 kV transmission lines. Does the line need distance relay and directional relay as this relatively short line??

Regs,

sks
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KITES
Active Contributor

Join Date: Jan 2013
Posts: 10
#1

Re: Distance Relay fundamentals...

01/30/2013 5:51 AM

For 500mts, conventional O/C relay IDMTL (51) should suffice. However if you have parallel radial feeders from same source, then additionally 67(directional O/C relay).

Also, using 85 pilot wire protection would be the best cost effective solution.

Alternatively since your distance is short, you can go for simple current differtial protection relay with Class X CT's on both side....
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#2

Re: Distance Relay Fundamentals...

01/30/2013 7:20 PM

If it's you're project you really shouldn't be asking a group of guys on the internet how to do you're job. How would you're employers view it?

__________________
 The reports of my death are greatly exaggerated.
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sauravbabu
Power-User
Engineering Fields - Electrical Engineering - New Member

Join Date: Dec 2009
Posts: 247
#3
In reply to #2

Re: Distance Relay Fundamentals...

01/30/2013 11:21 PM

Also, if we have 11 kV reclosing circuit breakers, then distance relay should not be used?

Regs,

sks
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Anonymous Poster #1
#4

Re: Distance Relay Fundamentals...

02/06/2013 12:22 AM

Hi

You can rather use current differential relays at both ends of the short line

Greetings M & L
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Anonymous Poster #1
#5

Re: Distance Relay Fundamentals...

02/07/2013 12:25 AM

Hi mate

Get a Nulec Recloser and install it on your 11kV 500meter line

Greetings

M & L
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Previous in Forum: Load Sharing of Transmission Lines   Next in Forum: 220V Ac 1Ph + N Power Supply To Control Cabinet

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