Effects of power transformer high-frequency equivalent circuit parameters non-uniformity on fault diagnosis using SFRA test

Ibrahim, Khalid H.; Korany, Nourhan R.; Saleh, Saber M.

doi:10.1016/j.asej.2021.101674

Cited by 12 publications

(6 citation statements)

References 16 publications

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“…The equivalent transformer RLC circuit used for the SFRA broadband frequency analysis includes electrical and magnetic bonds between individual transformer elements. Such RLC circuit has unique frequency characteristics for a specific geometry [52], [53].…”

Section: Additional Offline Measurement By the Sweep Frequency Respon...mentioning

confidence: 99%

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

Gutten,

Korenciak,

Karman

et al. 2023

Measurement Science Review

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The article describes the non-contact and contact analysis of 1-MVA dry power transformers with epoxy-resin insulation using an acoustic camera and frequency analyzer with automatic sweeping for low-middle frequency areas. Power transformers are most commonly used for construction component (core, windings, taps) analysis. The electrical, non-rotating machine generates electromagnetic and acoustic emissions that can be used to analyze dry transformers during their operation. Non-contact online diagnostic methods have many advantages over offline methods because it is not necessary to shut down the transformer, and also, the condition and behaviour of the machine are analyzed during its normal operation. The article presents the analysis and comparison of structural parts of the distribution dry transformers of the same type and power. The problem of insufficient or incorrect clamp-screw connection was identified using the SFRA (Sweep Frequency Response Analysis) method.

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Section: Additional Offline Measurement By the Sweep Frequency Respon...mentioning

confidence: 99%

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

Gutten,

Korenciak,

Karman

et al. 2023

Measurement Science Review

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show abstract

“…Therefore, they should be prudently monitored to ensure a reliability and service continuity of the electrical power system (Zhao et al , 2019). Frequency response analysis (FRA) is a non-destructive technique that has grasped popularity in power transformer winding diagnosis (Meira et al , 2018; Ibrahim et al , 2022). This advanced demand requires additional interpretation of FRA data.…”

Section: Introductionmentioning

confidence: 99%

Toward unique electrical ladder network model synthesis of a transformer winding high-frequency modeling using K-means and metaheuristic-based method

Chanane,

Houassine

2024

COMPEL

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Purpose Although, numerous optimization algorithms have been devoted to construct an electrical ladder network model (ELNM), they suffer from some frail points such as insufficient accuracy as well as the majority of them are unconstrained, which result in optimal solutions that violate certain security operational constraints. For this purpose, this paper aims to propose a flexible-constraint coyote optimization algorithm; the novelty lies in these points: penalty function is introduced in the objective function to discard any unfeasible solution, an advanced constraint handling technique and empirical relationship between the physical estimated parameters and their natural frequencies. Design/methodology/approach Frequency response analysis (FRA) is very significant for transformer winding diagnosis. Interpreting results of a transformer winding FRA is quite challenging. This paper proposes a new methodology to synthesize a nearly unique ELNM physically and electrically coupled for power transformer winding, basing on K-means and metaheuristic algorithm. To this end, the K-means method is used to cluster the setting of control variables, including the self-mutual inductances/capacitances, and the resistances parameters. Afterward, metaheuristic algorithm is applied to determine the cluster centers with high precision and efficiency. Findings FRA is performed on a power transformer winding model. Basing on the proposed methodology, the prior knowledge in selecting the initial guess and search space is avoided and the global solution is ensured. The performance of the abovementioned methodology is compared using evaluation expressions to verify its feasibility and accuracy. Originality/value The proposed method could be generalized for diagnosis of faults in power transformer winding.

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“…Electrical transformers are one of the most important parts of the electrical system because of their significant role in increasing the reliability of the electrical grid and the durability of the power supply. The power transformer is an essential element of an electrical power system because it regulates the voltage level to set the best possible system operation [1]. In order to ensure a long, useful service life, it is critical that a power transformer and its ancillary components are tested regularly for incipient fault modes.…”

Section: Introductionmentioning

confidence: 99%

Testing and diagnostic out of the service power transformer using a sweep frequency response analysis (SFRA) comparing with China standard

Salim,

Rouabhi,

Ayad

et al. 2024

Diagnostyka

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A several diagnostic methods used to evaluate and detect any potential issues or faults in the transformer before they cause significant problems. The research proposal focuses on employing the SFRA (Sweep Frequency Response Analysis) technique, renowned for its exceptional sensitivity and diagnostic capabilities. This method serves to identify the mechanical integrity of the transformer's core, winding distortion, and clamping structures by analyzing their electrical transfer functions across a broad frequency spectrum. By utilizing SFRA, the study aims to accurately predict the internal physical condition of the transformer, making it a highly effective and reliable indicator for assessing its overall health. The motivation of this present work is using all experiments of SFRA were conducted and validated on a three-phase 30kV/0.4KV voltage transformer with 50kVA at the laboratory of Msila university. The result of these experiments is presented and discussed in terms of interpretation the analyses based on different standards.

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Effects of power transformer high-frequency equivalent circuit parameters non-uniformity on fault diagnosis using SFRA test

Cited by 12 publications

References 16 publications

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

Toward unique electrical ladder network model synthesis of a transformer winding high-frequency modeling using K-means and metaheuristic-based method

Testing and diagnostic out of the service power transformer using a sweep frequency response analysis (SFRA) comparing with China standard

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