220 kV Outdoor substation layout. Distances between equipment
220 kV Outdoor substation layout. Distances between equipment
(OP)
Hello,
I need information about how to calculate the minimum distances between current transformers, voltage transformers, surge arresters, power transformers and circuit breakers in outdoor 220 kV substations.
I have done an insulation coordination study and have the minimum phase-to-earth and phase-to-phase distances, but how to obtain the design or layout distances?
Can anyone give references to standards or design guides about it?
Thanks.
I need information about how to calculate the minimum distances between current transformers, voltage transformers, surge arresters, power transformers and circuit breakers in outdoor 220 kV substations.
I have done an insulation coordination study and have the minimum phase-to-earth and phase-to-phase distances, but how to obtain the design or layout distances?
Can anyone give references to standards or design guides about it?
Thanks.






RE: 220 kV Outdoor substation layout. Distances between equipment
RE: 220 kV Outdoor substation layout. Distances between equipment
Any of them would work. Is is for a substation in Mexico, their standards are a mix of IEEE and IEC.
RE: 220 kV Outdoor substation layout. Distances between equipment
RE: 220 kV Outdoor substation layout. Distances between equipment
RE: 220 kV Outdoor substation layout. Distances between equipment
RE: 220 kV Outdoor substation layout. Distances between equipment
Thanks for the document. I am aware of CFE standards. A supplier sent me a 1988 year CFE document with distances between, surge arrester, voltage transformer and current transformer of 5 m, and 10 m to the power transformer. And phase-to-phase distances of 6 m.
I have not found such long distances for 220 or 230 kV. I tried to locate the 1988 year document in CFE website, where their specs and standards are freely available for download and could not locate it nor anything similar. That is why I am trying to locate some standard about recommended distances in outdoor substations.
I find CFE standards to be a mix of IEC and IEEE. They are mainly based in IEC for design, but equipment is mainly based in IEEE, so it is quite a mess.
RE: 220 kV Outdoor substation layout. Distances between equipment
- ANSI & IEC standards have differences in clearance requirement.
- ANSI standard voltage is 230 kV and IEC std voltage is 220 kV. Standard BIL rating is also different.
- CFE use live tank breakers. Dead tank design is popular in the ANSI marketplaces and not common in Mexico.
I guess both standards will work OK for 220 kV. However, for local compliance and avoid surprises, check in advance for approval with the utility and anyone that has jurisdictions with your project.