A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

doi:10.5829/ije.2021.34.09c.04

Cited by 2 publications

(2 citation statements)

References 16 publications

(19 reference statements)

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“…Under the normal operating conditions, the electromagnetic forces (EMFs) acting on the windings are small due to the relatively small magnitude of the leakage flux. However, under the short-circuit condition, the electromagnetic *Corresponding Author Email: doanthanhbao@qnu.edu.vn (B. D. Thanh) forces (EMFs) generated as a result of the interaction between the leakage flux and the short-circuit current are very large, this can lead to translation, destruction, or even explosion of the windings (6)(7)(8)(9)(10).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Axial and Radial Forces in Windings of Amorphous Core Transformers

Thanh,

Le,

Quoc

2024

IJE

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The aim of this study is to examine and analyze the axial and radial forces, electromagnetic forces (EMFs) acting on the low and high-voltage windings of an amorphous core transformer via the two different approaches: an analytic approach and a 3-D finite element method (FEM). Firstly, the analytic method is proposed to analyze the distribution of leakage magnetic field in the magnetic circuit and the forces acting on the transformer windings. The FEM embedded in the Ansys Maxwell tool is then proposed to compute and simulate the axial and radial forces under three different operating conditions: no-load, rated full-load, and short-circuit. The obtained results from two different methods such as the rated voltage, rated current, short-circuit current, axial and radial forces and EMFs in the low and highvoltage windings are finally compared to illustrate an agreement of methods. The validation of the methods is applied on a three-phase amorphous core transformer of 1600kVA-22/0.4kV.

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Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Axial and Radial Forces in Windings of Amorphous Core Transformers

Thanh,

Le,

Quoc

2024

IJE

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“…Among the protection schemes of transformers, the phase differential (PD) protection, being the most applied for transformers having ratings of 5 MVA and above [1]. However, when magnetizing inrush current passes through the power transformer windings and/or current transformer (CT) saturation occurs, a phase differential relay is prone to incorrectly operate.…”

Section: Introductionmentioning

confidence: 99%

Presenting an Adaptive Restraint Method to Improve Performance of Ground Differential Protection of Power Transformer

Bkhaitawi

Abdoos

Ebadi

2022

IJE

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The ground differential (GD) relay is used to detect internal ground faults on the power transformer windings and terminals. In fact, this relay is employed as a complement to the phase differential (PD) relay. However, its stability is affected by magnetic saturation in current transformers (CTs) cores so that the spurious differential current caused by CT saturation may lead to the relay malfunction. In this paper, by modifying the restraining current definition in a conventional method, an adaptive restrain method is proposed. To evaluate the proposed method performance compared with conventional method, a real 230/63 kV power transformer under a large number of internal fault, external fault and in rush current cases are simulated in PSCAD/EMTDC environment. It is worth noting that Jiles-Atherton (JA) model is utilized to simulate CTs. MATLAB software is used to implement and analyze these methods using obtained simulation. Obtained results show that the proposed method is quite superior to the conventional method, despite its simplicity.

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A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

Cited by 2 publications

References 16 publications

A Comparative Analysis of Axial and Radial Forces in Windings of Amorphous Core Transformers

A Comparative Analysis of Axial and Radial Forces in Windings of Amorphous Core Transformers

Presenting an Adaptive Restraint Method to Improve Performance of Ground Differential Protection of Power Transformer

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