Full Scheme Distance Protection Relays

[521AB]

Hi guys!
According to IEC standard (don't remember the number, sorry), the definition of full scheme distance protection relay could be interpreted in a quite strange way.
In simple words it requires 6 parallel and independent measuring circuits.
This means that one numerical relay, performing all the 6 calculations in multitasking structure, will not be a full scheme relay. A full scheme relay must have 6 separate computers!!!
This is not my opinion, maybe because I was born in the numerical technology, and find this position quite burocratic and inconstructive. But there is a certain logic behind.
Shouldn't we start to talk about "distance protection relay with full scheme concept implemented numerically"?
What's your opinion?

 

[waross]

Copuld it be that in the days of electromechanical relays, the definition was accurate and appropriate? As computerized multifunction relays were developed, they were most likely accepted and approved as part of the approval process as meeting the intent of the definition.
Your point is well taken, and I expect that the standard will eventually by rewritten to include newer technology.
I do feel that this is a point of semantics rather than technical requirements.
respectfully

 

[bacon4life]

Not having read the unnumbered standard, it seems like the definition of measuring unit could be defined as the analog to digital converter.

I have seen proposals for PT's to be connected to a data bus with fiber connections to the relays, I wonder if the PT would then count as the measuring device?