Steady-state zero-sequence currents in a transmission system: a parameter analysis

Sjoerd Nauta, Jeroen B.M. van Waes, Leonel Noris, Kees Koreman

Research output: Chapter in Book/Report/Conference proceedingConference contributionProfessional

Abstract

If present, zero sequence currents can affect the total magnetic field around an overhead line or cable. The question is how large it is and which parameters are important. This paper presents a case study, using a parametric analysis to understand the influence of the most important parameters on the circulating and through zero-sequence currents. It is based on a branch where measurements were performed in the past. The considerations include: branch types (overhead line or underground cable), presence of transpositions, underground cable configurations (triangle or flat formation), the influence of circuit lengths, transformer zero-sequence impedances and the presence of capacitor banks. Parallel simulations were developed independently in PSCAD and EMTP/ATP to cross-validate the outcomes. Realistic component characteristics were used to achieve a model outcome that is as close to reality as possible. From the simulations it may be concluded that: A typical through zero-sequence current of approximately 0.6% of the average load positive sequence current was found in the reference case (un-transposed overhead line). In transposed overhead line systems the through zero-sequence current is expected to be negligible. In un-transposed systems, systems that consist of underground cables have lower through zero-sequence currents than overhead lines. Phase position and ordering has a large influence on both through- and circulating zero-sequence currents. The influence of the transformer zero-sequence impedance on through zero-sequence currents is significant. The outcomes can be used to assess what levels of zero-sequence currents can be expected in practice.
Original languageEnglish
Title of host publication27th International Conference on Electricity Distribution, CIRED 2023
PublisherInstitution of Engineering and Technology (IET)
Number of pages5
ISBN (Electronic)978-1-83953-855-1
DOIs
Publication statusPublished - 3 Oct 2023
Externally publishedYes
Event27th International Conference on Electricity Distribution (CIRED 2023) - Rome, Italy
Duration: 12 Jun 202315 Jun 2023

Conference

Conference27th International Conference on Electricity Distribution (CIRED 2023)
Country/TerritoryItaly
CityRome
Period12/06/2315/06/23

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