2006-09-01 01:06:32 · 3 answers · asked by for_pat2006 1 in Science & Mathematics ➔ Engineering
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"?
2006-09-01 02:04:52 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Distance relay is used when overcurrent relay is not effective. that is when fault current generated by systemis low.distance relay measure impedeance difference that is the ratio of current and voltage during fault current increase voltage discrease.It action also depent upon the location of fault
2006-09-01 21:49:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It is related to what: Science or Mathematics? I am sorry, donno.
2006-09-01 01:14:59 · answer #3 · answered by Indian_Male 4 · 0⤊ 0⤋