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Feature #5374

Creation of a new LN for protection function

Added by Christophe Ghafari almost 2 years ago. Updated about 1 year ago.

Status:
In Progress
Priority:
Normal
Assignee:
-
Category:
Standard extension required
Start date:
06/02/2022
Due date:
08/14/2022 (about 20 months late)
% Done:

0%

Estimated time:
ID:
Source:
RTE
TF Unique ID:
WG10 Proposal:
Estimated Completion:
Discuss in Upcoming Meeting:
No
To discuss in WG10:
No
Short Proposal:
Standard(s):

IEC 61850-7-4

Needs More Information:
Yes
Assigned TF:

Description

To detect faults occurring between the busbar and the HV side of a transformer/autotransformer, a specific function based on impedance measurement is installed of the LV side of the transformer/autotransformer. This function shares similarities with the distance protection (PDIS) : it computes the 6 impedance loops based on voltage and current measurements to detect if a fault has occurred. However, to detect phase-to-ground faults, the traditional approach of using the k0 factor to compute the phase-to-ground impedance loops cannot be used as it is the case for distance protection, especially if the transformer coupling is delta-delta (residual current cannot flow). The phase-to-ground impedance loops are thus computed by simply dividing the voltage by the current without taking into consideration neither the k0 factor nor the residual current.

Proposal : a new LN (PIMP = Impedance protection ?), with associated DO and DA should be created to deal with this use case.


Files

LN_PIMP.pdf View LN_PIMP.pdf 168 KB Description of the RTE use case Maud Merley, 09/13/2022 08:28 AM
Rte proposal PIMP.docx Rte proposal PIMP.docx 17 KB New LN proposal Maud Merley, 09/13/2022 08:28 AM

Proposal descriptions

RTE to provide list of DO/DA for PDIS along with use-case/description.
Also, it would be good to have justification why is needed to create new LN and not only to extend PDIS.

Also available in: Atom PDF