CIM Issues #5108
PowerTransformerEnd
61970-301
Description
The description of the PowerTransformerEnd includes the following part which is ambiguous
1) for a two Terminal PowerTransformer the high voltage (TransformerEnd.endNumber=1) PowerTransformerEnd has non zero values on r, r0, x, and x0 while the low voltage (TransformerEnd.endNumber=2) PowerTransformerEnd has zero values for r, r0, x, and x0. Parameters are always provided, even if the PowerTransformerEnds have the same rated voltage. In this case, the parameters are provided at the PowerTransformerEnd which has TransformerEnd.endNumber equal to 1.
There are overlap of statements and also a statement that endNumber=1 winding "has non zero values on r, r0, x, and x0" which can be understood that if it is an issue if one of those values is zero. In addition the statement "Parameters are always provided" suggests that these parameters are required which is not the case
Proposed Solution
Proposal is to replace that part of the description with the following text
1) two PowerTransformerEnd-s shall be defined for a two Terminal PowerTransformer even if the two PowerTransformerEnd-s have the same rated voltage. The high voltage PowerTransformerEnd (TransformerEnd.endNumber=1) is the one used to exchange resistances (r, r0) and reactances (x, x0) of the PowerTransformer while the low voltage PowerTransformerEnd (TransformerEnd.endNumber=2) shall have zero impedance values , if provided .
Decision
UTF decided (Minneapolis meeting Sep 2022) to update the description
1) two PowerTransformerEnd-s shall be defined for a two Terminal PowerTransformer even if the two PowerTransformerEnd-s have the same rated voltage. The high voltage PowerTransformerEnd (TransformerEnd.endNumber=1) is the one used to exchange resistances (r, r0) and reactances (x, x0) of the PowerTransformer while the low voltage PowerTransformerEnd (TransformerEnd.endNumber=2) shall have zero impedance values
Release Notes
Part of the description of PowerTransformerEnd ws updated to
1) two PowerTransformerEnd-s shall be defined for a two Terminal PowerTransformer even if the two PowerTransformerEnd-s have the same rated voltage. The high voltage PowerTransformerEnd (TransformerEnd.endNumber=1) is the one used to exchange resistances (r, r0) and reactances (x, x0) of the PowerTransformer while the low voltage PowerTransformerEnd (TransformerEnd.endNumber=2) shall have zero impedance values.
Updated by Yang Feng over 2 years ago
[Yang] The last sentence in the proposed context by Chavdar should be revised to "...shall have zero impedance values, if not provided."
Updated by Eric Stephan over 1 year ago
- Status changed from Open to In Progress
9/22/2022 WG agreed to drop ", if provided" statement in Proposed Solution.