Feature #5374
Creation of a new LN for protection function
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IEC 61850-7-4
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.
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 2 months 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 27 days ago
- Discuss in Upcoming Meeting changed from No to Yes