NickParker
Electrical
- Sep 1, 2017
- 434
The transformer specification states that "Transformer enclosures and cable connection boxes shall be designed in such a way that an internal arc will not pose any personnel risk to operators, even in the event of an arc fault."
After consulting with the vendor, they propose using a UFES (Ultra-Fast Earthing Switch) on the transformer enclosure, which can clear faults within 4ms. I am accustomed to using an arc detection relay in MV switchgear, which trips the breaker but takes longer—typically around 50 to 80ms.
I would appreciate your thoughts on using UFES versus an arc detection relay.
After consulting with the vendor, they propose using a UFES (Ultra-Fast Earthing Switch) on the transformer enclosure, which can clear faults within 4ms. I am accustomed to using an arc detection relay in MV switchgear, which trips the breaker but takes longer—typically around 50 to 80ms.
I would appreciate your thoughts on using UFES versus an arc detection relay.