Special zero-sequence current transformers to determine fault connection in medium voltage networks

Batulko, D. V.; Nikitin, K. I.; Bigun, A. Ya.

doi:10.1109/icieam.2016.7911483

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…In previous research, unbalanced phase current identification methods have primarily relied on amplitude measurement techniques for phase currents. Zero-sequence current measurement, a widely-used amplitude measurement method, is employed for unbalanced phase current identification in substations [ 16 , 17 ]. This can be achieved with either three current transformers or a single zero-sequence current transformer.…”

Section: Introductionmentioning

confidence: 99%

“…This can be achieved with either three current transformers or a single zero-sequence current transformer. The method involving three current transformers faces several challenges in practical applications [ 16 ]. The rated current must be determined based on the current line load and the non-identical characteristics of the transformers may result in the misidentification of unbalanced phase currents.…”

Section: Introductionmentioning

confidence: 99%

“…The rated current must be determined based on the current line load and the non-identical characteristics of the transformers may result in the misidentification of unbalanced phase currents. Additionally, due to the limited space within switchgear assembly cubicles, only two current transformers can be installed for phases A and C [ 16 ]. In this context, the zero-sequence current transformer appears more suitable.…”

Section: Introductionmentioning

confidence: 99%

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Unbalanced Current Identification of Three-Core Power Cables Based on Phase Detection of Magnetic Fields

Liang

Yang

et al. 2023

Sensors

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Identifying unbalanced phase currents is crucial for control and fault alarm rates in power grids, especially in urban distribution networks. The zero-sequence current transformer, specifically designed for measuring unbalanced phase currents, offers advantages in measurement range, identity, and size, compared to using three separate current transformers. However, it cannot provide detailed information on the unbalance status beyond the total zero-sequence current. We present a novel method for identifying unbalanced phase currents based on phase difference detection using magnetic sensors. Our approach relies on analyzing phase difference data from two orthogonal magnetic field components generated by three-phase currents, as opposed to the amplitude data used in previous methods. This enables the differentiation of unbalance types (amplitude unbalance and phase unbalance) through specific criteria and allows for the simultaneous selection of an unbalanced phase current in the three-phase currents. In this method, the amplitude measurement range of magnetic sensors is no longer a critical factor, allowing for an easily attainable wide identification range for current line loads. This approach offers a new avenue for unbalanced phase current identification in power systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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