Unbalanced Faults using Symmetrical Components
Unbalanced Faults using Symmetrical Components
(OP)
For a line to ground fault with a delta star load transformer, solidly earthed. I am having trouble dealing with the source reactance, do I consider this for positive and negative sequence but ignore for zero?
Does solidly earthed mean that I do not need to include earth fault loop impedance in my calcs?
Does solidly earthed mean that I do not need to include earth fault loop impedance in my calcs?






RE: Unbalanced Faults using Symmetrical Components
RE: Unbalanced Faults using Symmetrical Components
What David said. But here's a quick answer.
"For a line to ground fault with a delta star load transformer, solidly earthed.... the source reactance, do I consider this for positive and negative sequence but ignore for zero?" Correct. The source IMPEDANCE does not appear in the zero sequence network.
"Does solidly earthed mean that I do not need to include earth fault loop impedance in my calcs?" Incorrect - you need to include the earth fault loop.
Do some more research to make sure you understand the reasons for these answers. Blackburn's book is a great resource.
RE: Unbalanced Faults using Symmetrical Components