Protection System
Protection System
(OP)
what is the different between primary relay and backup relay ?
Thank you,
Thank you,
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Protection System
RE: Protection System
RE: Protection System
- Main-1 protection and Main-2 protection
or
- Main protection and Back up protection
or
- Primary protection and back up protection
or
- Primary protection and secondary protection
All should have same functionality. Used in different regions.
RE: Protection System
There is no standard for the terms Primary, Secondary, or Backup. But I would assume the Primary has some function that the backup does not.
If you can read the settings then that will answer your question.
RE: Protection System
what I mean in the question is what is the job for each relay, primary and backup. How each of them protect the area? How do the primary and backup relay work ?
Thank you.
RE: Protection System
RE: Protection System
In older relays the secondary does not communicate, but that is changing to both relays communicate with there counterpart.
Backup implies a slower relay, or in david's case a crappy relay by some company that does not bother talking to utility engineers.
We quit using the term backup, because it was expected to be slower than the primary, and many times it is as fast or faster than the primary. And this confused people.
The term set A and set B came out of two relays with the same settings.
RE: Protection System
Today, of course, two duplicated sets are best solution, for transformer, motors and generators.
For lines 87L is "problematic", without 87L of course duplicated too, 79 maybe not
RE: Protection System
RE: Protection System
RE: Protection System
For industrial applications, there may be one relay or two with protection functions divided into primary protection (87T or 87B for example) and 50/51 for secondary protection.
RE: Protection System