scholarly journals Application of Frequency Response Analysis Technique to Detect Transformer Tap Changer Faults

2021 ◽  
Vol 11 (7) ◽  
pp. 3128
Author(s):  
Salem Mgammal Al-Ameri ◽  
Abdulaziz Almutairi ◽  
Muhammad Saufi Kamarudin ◽  
Mohd Fairouz Mohd Yousof ◽  
Ahmed Abu-Siada ◽  
...  
Keyword(s):  
Frequency Response ◽  
Low Voltage ◽  
Experimental Testing ◽  
Equivalent Circuit Model ◽  
Distribution Networks ◽  
Diagnostic Tools ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Electrical Transmission ◽  
Tap Changer

Power transformers are located in the electrical transmission and distribution networks where different voltage levels are needed. The turn ratio of the low voltage and high voltage windings is mechanically controlled by an on-load tap changer or de-energized tap changer. As the tap changer is the transformer’s only moving part, it is highly susceptible to mechanical failure and aging degradation. While some diagnostic tools have been used to determine the mechanical condition of tap changer contacts, not much attention was given to use the frequency response analysis to diagnose the transformer’s tap changers’ mechanical integrity. This paper is taking one step forward into maturing the application of the frequency response analysis (FRA) technique to detect transformer tap changer faults. In this regard, two common tap changer faults are created, and experimental testing for four FRA test configurations is conducted. For a better understanding of the tap changer fault mechanism, an electrical equivalent circuit model is proposed and designed using Simulink. The simulation and implementation of the equivalent circuits using MATLAB\R2018a.

scholarly journals The investigation of frequency response analysis for power transformers winding condition

2019 ◽  
Vol 139 ◽  
pp. 01023
Author(s):  
Artyom Nazarov ◽  
Vitaliy Savelev ◽  
Dennis Frogh
Keyword(s):  
Frequency Response ◽  
Distribution Systems ◽  
Short Circuit ◽  
Mechanical Deformation ◽  
Power Transformers ◽  
Diagnostic Tools ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Electrical Transmission ◽  
The Impact

In modern electrical transmission and distribution systems, power transformers are critical components within the network. In the event that a failure occurs in service, the impact can be far reaching. The majority of mechanical deformation within power transformers is due to short circuit faults. The ageing transformer population increases the likelihood of failure so a reliable diagnostic tools required to determine the remaining life of these assets. Although, frequency response analysis (FRA) has been recently recognized as the most reliable detection tool for mechanical deformation in transformers, in the event of minor fault, the current FRA interpretation approach may not able to detect any variations between healthy and faulty FRA signatures. This paper focuses on FRA tests for power transformer and interpretation of obtained FRA signatures.

scholarly journals Extended Use for the Frequency Response Analysis: Switching Impulse Voltage Based Preliminary Diagnosis of Potential Sources of Partial Discharges in Transformer

2020 ◽  
Vol 10 (22) ◽  
pp. 8283
Author(s):  
Kamalaselvan Arunachalam ◽  
Balasubramanian Madanmohan ◽  
Rajesh Rajamani ◽  
Natarajan Prabaharan ◽  
Hassan Haes Alhelou ◽  
...  
Keyword(s):  
Frequency Response ◽  
Low Voltage ◽  
Partial Discharges ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Potential Sources ◽  
Impulse Voltage ◽  
Before And After ◽  
Test Voltage ◽  
Low Capacitance

The Frequency Response Analysis approach (FRA) is useful in the fault diagnosis of transformers. However, its usefulness in diagnosing any potential sources of Partial Discharge (PD) in transformers has not been thoroughly investigated so far. In this work, the use of Impulse voltage-based FRA (IFRA) in diagnosing inter-turn shorts and potential sources of PD were investigated on a 315 kVA, 11 kV/433 V transformer. Inter-turn shorts and PD sources were emulated and the usefulness of IFRA in their diagnosis was investigated while using switching impulse voltage at different magnitude levels as the test signals. For emulating the inter-turn shorts and the PDs, special tappings were provided on one of the 11 kV windings through the low capacitance bushings. Low voltage impulse was successful in diagnosing the inter-turn shorts, but unsuccessful in identifying the sources of PDs. During the test condition, the test voltage was adjusted with the presence of artificially created PD sources. The frequency response of the transformer before and after the inception of PD was observed and analyzed in this article. The FRA results demonstrated that the switching impulse voltage based IFRA approach at moderate voltages could be useful in diagnosing the presence of the potential sources of PDs.

scholarly journals Frequency response analysis for transformer tap changer damage detection

2020 ◽  
Vol 11 (1) ◽  
pp. 350
Author(s):  
S. Al-Ameri ◽  
A. A. Alawady ◽  
M. F. M. Yousof ◽  
H. Ahmad ◽  
Ali. A. Salem ◽  
...  
Keyword(s):  
Frequency Response ◽  
Low Frequency ◽  
Resistance Measurement ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Ratio Measurement ◽  
Study Results ◽  
Transformer Winding ◽  
Tap Changer ◽  
Huge Variation

Frequency response analysis (FRA) method has been proven to detect the transformer winding damage. However, there is no practical study which investigates the damages on transformer tap changer even though it has a high failure rate. Hence, this paper investigates normal and faulty transformer tap changer using FRA. The FRA measurements conducted using four different test configurations. Also, normal tap changer, pitting and coking tap changer contact were investigated. In addition to FRA measurement, winding resistance measurement has been conducted. The transformer turn ratio measurement also conducted to identify the taps positions. This study results significant to understand the effect of pitting and coking tap changer on the transformer frequency response. The results showed that pitting has a slight influence on the frequency response. However, coking shows a huge variation in low-frequency response. This effect observed during the winding resistance measurement.

Detection of Transformer Faults Using Frequency Response Analysis with Case Studies

2013 ◽  
pp. 456-486
Author(s):  
Nilanga Abeywickrama
Keyword(s):  
Frequency Response ◽  
Case Studies ◽  
Low Voltage ◽  
Short Circuit ◽  
Diagnostic Methods ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Mechanical Deformations ◽  
Mechanical Faults ◽  
Non Destructive

Power transformers encounter mechanical deformations and displacements that can originate from mechanical forces generated by electrical short-circuit faults, lapse during transportation or installation and material aging accompanied by weakened clamping force. These types of mechanical faults are usually hard to detect by other diagnostic methods. Frequency response analysis, better known as FRA, came about in 1960s (Lech & Tyminski 1966) as a byproduct of low voltage (LV) impulse test, and since then has thrived as an advanced non-destructive test for detecting mechanical faults of transformer windings by comparing two frequency responses one of which serves as the reference from the same transformer or a similar design. This chapter provides a background to the FRA, a brief description about frequency response measuring methods, the art of diagnosing mechanical faults by FRA, and some case studies showing typical faults that can be detected.

Comparative Study of Worldwide Standards for Interpreting Frequency Response Analysis (FRA) Results of Distribution Transformers

2015 ◽  
Vol 793 ◽  
pp. 144-148
Author(s):  
Sharin Ab Ghani ◽  
Yasmin Hanum Md Thayoob ◽  
Young Zaidey Yang Ghazali ◽  
Mohd Shahril Ahmad Khiar ◽  
Imran Sutan Chairul ◽  
...  
Keyword(s):  
Comparative Study ◽  
Frequency Response ◽  
Technical Problem ◽  
Diagnostic Tools ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Long Run ◽  
Distribution Transformers ◽  
Detection Capabilities ◽  
Electrical Faults

Distribution transformer in Malaysian electricity network is categorized as major element on delivering electricity throughout the nation. Advanced diagnostic tools are used to monitor any technical problem of transformer to sustain its capability in the long run. One type of it which is currently being used in worldwide is Frequency Response Analysis (FRA). The reliability from this method is proven worldwide in diagnosing transformer condition especially a mechanical movement. FRA technique is done by comparing the response result in transformer initial condition to its current condition. The interpretation of transformer condition from the response is based on frequency sub-bands. Each frequency sub-bands are indicating any movement parts of transformer and electrical faults. Currently, there are three worldwide standards established for interpreting the FRA results but both of them are different in frequency sub-bands range. Up to now, there are no research papers comparing the fault detection capabilities from frequency sub-bands range for both standards. In this paper, comparative study is done to visualize and interpret the capabilities from three standards (IEEE Std C57.149 2012, DL/T911-2004 and Cigre WG A2/26); by focus on the frequency sub-bands range.

Estimation and Reduction of Motor Input Surge Voltage using Frequency Response Analysis

2012 ◽  
Vol 132 (8) ◽  
pp. 630-637
Author(s):  
Toru Wakimoto ◽  
Yoshimitsu Takahashi ◽  
Norihito Kimura ◽  
Yukitoshi Narumi ◽  
Naoki Hayakawa
Keyword(s):  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis
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