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

Bkhaitawi, A. H. Z.; Abdoos, Ali Akbar; Ebadi, Ali

doi:10.5829/ije.2022.35.11b.16

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Initialization of parameters 𝜆 1 , {𝜔 1 k }, and {û 1 k } from 0 to n. 2. Updating 𝜆 n+1 and 𝜔 n+1 k through Equations ( 10) and (11):…”

Section: Data Preprocessingmentioning

confidence: 99%

“…Currently, the conventional second harmonic method in differential relays needs a 3/4 cycle to recognize the fault type based on the DCS. In [11], the ground differential relay is used to detect IFs on the windings and terminals of power transformers. One of the drawbacks of that method is the dependence on the second harmonic value of the phase current and the angle between the neutral and residual currents.…”

Section: Introductionmentioning

confidence: 99%

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A power transformer differential protection method based on variational mode decomposition and CNN‐BiLSTM techniques

Afsharisefat,

Jannati,

Shams

2024

IET Generation Trans & Dist

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Power transformers play a critical role in the performance of power systems. This equipment is costly due to significant copper and iron prices and manufacturing costs. Therefore, maintenance and protection of such equipment is essential. Despite its robust performance, maloperation of differential protection (DP) in transformers may cause operational challenges to power system operators. The differential relay may operate incorrectly after the transformer energization leads to an inrush current (IC) and the relay identifies the event as an internal fault, and consequently issues the trip command. The other case of maloperation includes, but not limited to, a moment when the current transformer saturates due to an external fault. In this paper, a novel approach for DP is proposed, that is based on signal processing methods. In this paper, variational mode decomposition (VMD) and the deep neural network are implemented by using the convolutional neural network (CNN) and bi‐directional long short‐term memory (BiLSTM) models. The VMD decomposes differential current signal (DCS) to intrinsic mode functions with corresponding narrow‐band property frequency spectrums, which provides more detailed information about signal characteristics in different frequency bands. At the next stage, an effective feature for the BiLSTM is extracted by the CNN with the convolutional layers to classify events and proper discrimination. Extensive simulations on a 500 MVA transformer in MATLAB demonstrate the effectiveness of the proposed protection approach to differentiate ICs from internal and external faults with 99.8% accuracy in less than 1/8th of a power cycle.

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“…Initialization of parameters 𝜆 1 , {𝜔 1 k }, and {û 1 k } from 0 to n. 2. Updating 𝜆 n+1 and 𝜔 n+1 k through Equations ( 10) and (11):…”

Section: Data Preprocessingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A power transformer differential protection method based on variational mode decomposition and CNN‐BiLSTM techniques

Afsharisefat,

Jannati,

Shams

2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…To evaluate the proposed method's performance, a part of a real high-voltage (HV) substation introduced by Bkhaitawi et al [12], including a 160 MVA, 230/63 kV power transformer, a grounding transformer (GT), and both side current transformers (CTs), is simulated using the PSCAD/EMTDC program (see Figure 1). Tables 1 and 2 show some technical information about the power transformer and CTs, respectively.…”

Section: Experimental Studymentioning

confidence: 99%

Discrimination between Inrush and Internal Fault Currents in Power Transformers Using Hyperbolic S-Transform

Yaseen,

Ebadi,

Abdoos

2023

IJE

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Numerous methods exist to distinguish between inrush current and internal faults, but these approaches have not yet become practical due to their inherent limitations. As a result, conventional methods, despite their well-known drawbacks, continue to be widely used in practice. In this paper, a new method based on time-frequency analysis is presented for detecting inrush current situations. To do this, a diverse array of scenarios involving a power transformer switching ON and internal fault cases are simulated using the PSCAD/EMTDC software package. Then, a hyperbolic S-transformer is employed to extract a determining index from the simulation results. Finally, a suitable threshold value for this index is computed so that inrush current can be distinguished from fault current by comparing the index with its threshold. Evaluation of the efficiency of the proposed method using simulation and real data confirms its excellent accuracy. Therefore, it can be used in algorithms for power transformer differential protection to improve their stability during inrush current transients.

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“…Devoid of electrical energy, our world would plunge into darkness, halting the progress of modernization and exposing us to *Corresponding Author Email: yaghobi@semnan.ac.ir (H. Yaghobi) a plethora of consequences that could jeopardize the very existence of life on earth. The production of electrical energy assumes a critical role in power networks, serving as a fundamental component for various aspects of our daily lives (1)(2)(3)(4).…”

Section: Introductionmentioning

confidence: 99%

A Protection for Loss of Field in Synchronous Generator in Presence of Series Compensation Capacitor

Noori,

Yaghobi

2024

IJE

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In this research, a new approach to safeguard against Loss of Field (LOF) in a synchronous generator, in the presence of a series compensation capacitor, is introduced. LOF can lead to detrimental effects on both the generator and the power network. Impedance-based negative and positive offset MHO relays are employed for the rapid recognition of LOE occurrences in the network. However, issues arise when a series compensation capacitor is integrated into the system, causing maloperation of the protection relays. The introduction of the series compensation capacitor alters the total impedance value, necessitating adjustments to the relay settings for precise functionality. The variation in the overall impedance of the system leads to the underreaching and overreaching of a relay. The study provides detailed explanations and comparisons of both types of MHO relays, along with their respective settings. A simulation is applied in DIGSILENT to assess the effect of series compensation capacitors on offset MHO (negative and positive) relay LOF protection. Ultimately, the article concludes by summarizing the pros and cons of both relay schemes.

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

Cited by 7 publications

References 10 publications

A power transformer differential protection method based on variational mode decomposition and CNN‐BiLSTM techniques

A power transformer differential protection method based on variational mode decomposition and CNN‐BiLSTM techniques

Discrimination between Inrush and Internal Fault Currents in Power Transformers Using Hyperbolic S-Transform

A Protection for Loss of Field in Synchronous Generator in Presence of Series Compensation Capacitor

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