Feature #5374

Creation of a new LN for protection function

Added by Christophe Ghafari over 1 year ago. Updated 10 months ago.

In Progress
Standard extension required
Start date:
Due date:
08/14/2022 (about 16 months late)
% Done:


Estimated time:
TF Unique ID:
WG10 Proposal:
Estimated Completion:
Discuss in Upcoming Meeting:
To discuss in WG10:
Short Proposal:

IEC 61850-7-4

Needs More Information:
Assigned TF:


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.


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.


Updated by Vladan Cvejic over 1 year ago

  • Status changed from New to Triage

Updated by Vladan Cvejic over 1 year ago

  • Due date set to 08/14/2022
  • Category set to Standard extension required
  • Proposal descriptions updated (diff)
  • Standard(s) set to IEC 61850-7-4

Updated by Carlos Rodriguez del Castillo over 1 year ago

  • Discuss in Upcoming Meeting changed from No to Yes

Updated by Carlos Rodriguez del Castillo about 1 year ago

From the point of view of RTE, the principle of the protection function stated here is not the same as PDIS.
Action: Ask TC95 people if they recommend to create a new LN for this impedance protection function.


Updated by Maud Merley about 1 year ago

The process to manage request from WG10 will be discussed in next plenary meeting of TC95 on October 6, 2022.
The proposal is to assign WG2 convener as entry point for this type of request from WG10 and to organise joint MT4/WG2 web meetings to define a position of TC95 (to be confirmed after TC95 plenary).

In parallel, TC95's advice about creating a dedicated LN for the PIMP protection function will be addressed in a joint MT4/WG2 meeting.


Updated by Carlos Rodriguez del Castillo about 1 year ago

  • Needs More Information set to Yes

Updated by Carlos Rodriguez del Castillo 12 months ago

  • Status changed from Triage to In Progress

TC95 is dealing it and we have to wait for more information from them.


Updated by Vladan Cvejic 10 months ago

It is concluded that issue has to be presented and discussed on next joint meeting of TC57 & TC38 & TC95 in Lyon (May 25th, 2023). Will be presented by Maud Merley.


Updated by Vladan Cvejic 10 months ago

  • Discuss in Upcoming Meeting changed from Yes to No

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