How to use Hi set function of protection relay
How to use Hi set function of protection relay
(OP)
Hi
I know that all of numerical relay have hi set function and I don't know how to use it.
I mean, under what condition it is used and how to select the right setting.
Or any web page, literature that I can look at it? I googled its use in the web and no satisfactory result.
I know that all of numerical relay have hi set function and I don't know how to use it.
I mean, under what condition it is used and how to select the right setting.
Or any web page, literature that I can look at it? I googled its use in the web and no satisfactory result.






RE: How to use Hi set function of protection relay
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I don't suffer from insanity. I enjoy it...
RE: How to use Hi set function of protection relay
What we normally do is to provide the IDMT with a higher time than the hi set and a lower current setting. As such the time of relay operation will be graded according to the level of the fault.
RE: How to use Hi set function of protection relay
I should have said that the hi-set function can have a definite minimum time, whereas the true instantaneous setting is just that - instantaneous.
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I don't suffer from insanity. I enjoy it...
RE: How to use Hi set function of protection relay
BTW, the term "hi-set" has never really been used in the US. We just call it "instantaneous" and if we add a time delay to it, we just live with that inconsistency or call it a "definite-time" function.
Dave