A novel protection scheme against turn-to-turn fault of MCSR based on equivalent magnetizing inductance

Zheng, Tao; Liu, Xiaoxiao; Wei, Junqi

doi:10.1016/j.ijepes.2019.105629

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Therefore, the topology of the zero-sequence equivalent circuit and the distribution of zero-sequence current are shown in Figure 13. This figure shows that due to the parallel-short-circuited connection of auxiliary windings, the current 3 ̇I0 flows almost FIGURE 13 Zero-sequence equivalent circuit under the condition of inner-turn fault of auxiliary winding.…”

Section: Inner-turn Fault Of Auxiliary Windingmentioning

confidence: 97%

“…However, the grid-side measurements of fault characteristics are inherently limited by the weak coupling within SRAW, leading to a lack of sensitivity in detecting inner-turn faults. To address this challenge, [13] has proposed a protection scheme based on the equivalent magnetizing inductance (EMI). Nonetheless, the change in EMI after an inner-turn fault occurs is relatively small and insignificant due to the numerous air gaps in SRAW's core, which can lead to potential risks of maloperation.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic circuit decomposition model and novel inner‐turn fault protection scheme for shunt reactor with auxiliary windings

Zheng

Tian

Meng

2023

IET Generation Trans & Dist

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Shunt reactor with auxiliary windings (SRAW) can compensate inductive reactive power for long‐distance transmission lines and supply steady power for low‐voltage devices on offshore platforms. The operation characteristics of SRAW can be commonly described by the air‐core transformer equivalent model. However, this model can only make an approximate simulation of the external characteristics of SRAW, and cannot reflect the actual electrical features inside the SRAW. To solve this problem, the authors propose a three‐segment magnetic circuit equivalent model (TMCEM) of SRAW based on the magnetic circuit decomposition method. This model can accurately describe the coupling relationship inside SRAW and can be used for the analysis of internal fault characteristics. Furthermore, through the fault analysis utilizing TMCEM, a novel protection scheme of SRAW based on virtual magnetizing differential current is proposed for the detection of the inner‐turn fault in SRAW. This protection scheme has high sensitivity and can effectively identify the inner‐turn faults without measuring voltages. By testing the physical model of SRAW, the effectiveness of the TMCEM and the proposed protection scheme against inner‐turn fault has been confirmed.

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Section: Inner-turn Fault Of Auxiliary Windingmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%