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CIM Issues #6452

Allow multiple RatioTapChanger on one TransformerEnd

Added by Yang Feng about 1 year ago. Updated about 1 month ago.

Status:
Closed
Priority:
Normal
Author/Contact Info:
Yang Feng
Base Release:
CIM18
Solution to be Applied To:
CIM18v11
Solution Version:
CIM18v11
Solution Applied By:
Chavdar Ivanov
Completion Date:
06/04/2024
CIM Keywords:
61970-Wires
Breaking Change:
Yes
Breaking Change Description:
May need product adjustment to handle multiple tap changers on the same winding in simulations like power flow, state estimation...
CIM Impacted Groups:
WG13
Requestor:
Standard(s):

61970-301,61970-452

Version:
Clause:
Sub-Clause:
Paragraph:
Table:
Originally Closed in Version:
Origination Date:
06/28/2023
Origination ID:
Originally Assigned To:

Description

The current cardinality only allows one RatioTapChanger to be associated to a PowerTransformerEnd. I've come across multiple scenarios where a transformer may have two RatioTapChanger on one PowerTransformerEnd, one of which is on-load tap changer and the other one is off-load tap changer. Attached I've added one example from a real customer data describing it.

Files

Multi_TapChanger_same_winding.png View Multi_TapChanger_same_winding.png 85.4 KB Yang Feng, 06/28/2023 10:04 AM
Tap_changer_issues.pptx Tap_changer_issues.pptx 471 KB Chavdar Ivanov, 03/09/2024 11:40 PM
Tap_changer_issues_v2.pptx Tap_changer_issues_v2.pptx 959 KB Chavdar Ivanov, 03/12/2024 02:26 AM
DescriptionsTransformerClasses_v4.docx DescriptionsTransformerClasses_v4.docx 315 KB Decided changes Chavdar Ivanov, 06/04/2024 03:25 PM

Proposed Solution

Change the cardinality to 1:0..2 (if this is allowed) or to 1:0..*
Most of the cases I have seen is to have two RatioTapChanger, never encountered more than two scenario

In addition there is a need to discuss: The possibility to have both a PhaseTapChangerTable and a RatioTapChangerTable assigned to a TapChanger in EQ and an attribute in SSH to denote which is active (reported by HOPS)

In addition there is a request to have a tap changer that has both ratio and phase tap changer on same winding and the winding connection angle is changing as part of the operational processes.

Slides are attached

Decision

Call 18 Oct 2023
the group is not sure that we need to change the cardinality. We rather have this modelled in a different way. Suggested to have a wider discussion in Minneapolis meeting - 23 Oct 2023

Multiple decisions are recorded in the attached document. Final agreement is to add this to the canonical CIM and profiles

Release Notes

Applied changes in canonical CIM
- added class StepOperationalLimitTable
- added class StepLimitTablePoint with attributes step and factor
- the association end RatioTapChanger.TransformerEnd is changed from 1 to 0..1
- new association is added between RatioTapChanger and TransformerEnd
- added class ConnectionAngleTapChangerTable with attribute ConnectionAngleTapChangerTable.windingConnectionAngle
- added class ConnectionAngleTapChanger
- added ConnectionAngleTapChanger.minWindingConnectionAngle, maxWindingConnectionAngle, connectionAngleStepSize, windingConnectionAngle, normalWindingConnectionAngle

- added class ImpedanceTapChangerTabular
- added class ImpedanceTapChangerTable
- added class ImpedanceTapChangerTablePoint with the following attributes: xEnd1, xEnd2, xEnd3, rEnd1, rEnd2, rEnd3, step, ratio, angle.
- the text "Note that the upper boundary is not constrained to 100 percent." is added to TapChangerTablePoint.b, .g, .r, .x

Changes are also applied to EQ (452) and SSH profiles (456)

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