Surge Arrester
Surge Arrester
(OP)
Dear all,
I would like to request reading material on regards Surge Arrester.
I have came across the different class for SA such as distribution class for teaser reactor and station class IV.
So, would like to learn more.
Thank you.
Regards,
Goh Kian Hui
I would like to request reading material on regards Surge Arrester.
I have came across the different class for SA such as distribution class for teaser reactor and station class IV.
So, would like to learn more.
Thank you.
Regards,
Goh Kian Hui






RE: Surge Arrester
RE: Surge Arrester
RE: Surge Arrester
RE: Surge Arrester
and why for 33 kV system, the rated surge arrester is higher than system voltage, 36 kV ?
RE: Surge Arrester
RE: Surge Arrester
RE: Surge Arrester
Sorry if this is simple question, I'm not sure.
RE: Surge Arrester
RE: Surge Arrester
RE: Surge Arrester
RE: Surge Arrester
From a high level perspective, an effectively grounded system is one where, under mainly single-line-to-ground faults, the voltage on the unfaulted phases will be no higher than around 1.25 per unit. So you won't see more than a 25% voltage rise. Based on this, you can get by with an arrester rating close to 80% of the phase-to-phase voltage.
For a system that is not effectively grounded, the unfaulted phase-to-ground voltage will approach 100% phase-to-phase voltage so you can't use an 80% arrester; you'll need a 100% arrester (again referring to the % of phase-to-phase voltage).
I can give you the sequence impedance ratios if you like, but I wanted to give you a better understanding of what we're dealing with first.
RE: Surge Arrester
If not mistaken for 275 kV system, if there is delta-winding, usually use earthing transformer for grounding.
As for wye-winding, I think is straight grounding to the copper tape. Sorry, if I'm not answering to the question.