T1 Line Communication Rate adequate for Differential Protection
T1 Line Communication Rate adequate for Differential Protection
(OP)
The question says it all. I am in the process of determining whether a T1 line will be adequate for differential line relay (SEL 311L) communication. The plan is to have the relay use a fiber input to a MUX which will output to a T1 line to the other substation. Reverse on the other end. Fiber to the other substation is too expensive right now and the 4 wire lease lines from our current telco provider is being phased out so a tone relay, which is primarily what we use, is not an option.
Is this something that I need to get with the providor to make sure they can provide what we need?
Typically how many cycles are needed from the time of fault detection to the time the breaker needs to open?
Any other insight on this topic would be greatly appreiciated.
Happy Halloween.
Is this something that I need to get with the providor to make sure they can provide what we need?
Typically how many cycles are needed from the time of fault detection to the time the breaker needs to open?
Any other insight on this topic would be greatly appreiciated.
Happy Halloween.






RE: T1 Line Communication Rate adequate for Differential Protection
RE: T1 Line Communication Rate adequate for Differential Protection
Attached is an example of what the message rate is using SEL's mirrored bits. This may not apply to the Differential comm ports.
SEL's own media converter has a data delay of 200ms: (They may have meant 200us)
http://www.sel-com.com/sel-3094.htm
In the end - it all comes down to measuring actual latency with similar packet/frame rates to the actual data that will be passed. smallgreek has it right. Contact SEL.
RE: T1 Line Communication Rate adequate for Differential Protection
RE: T1 Line Communication Rate adequate for Differential Protection
RE: T1 Line Communication Rate adequate for Differential Protection
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