Winding deformation analysis in power transformers using Finite Element Method
01 May 2014-pp 341-346
TL;DR: In this paper, Finite Element Method (FEM) and Sweep Frequency Response Analysis (SFRA) are used to model deformation on a benchmark winding and obtain corresponding signatures, which are used as indices to distinguish type and location of deformation.
Abstract: Winding deformation in power transformers affects its mechanical integrity. Diagnosis of winding deformation is a necessary step towards preventing its permanent failure. Sweep Frequency Response Analysis (SFRA) is widely used to analyze the nature and extent of deformation. However, the location of deformation needs the signature from the deformed transformer at various locations, which is practically not feasible. In this paper, Finite Element Method (FEM) and SFRA are used to model deformations on a benchmark winding and obtain corresponding signatures. Different parameters derived from SFRA are used as indices to distinguish type and location of deformations.
Citations
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TL;DR: In this paper, the authors proposed an n-stages circuit ladder network to simulate the response of a single phase 33kV transformer winding and compared the measured response to verify the proposed model, which can give a comprehensive understanding about the effect of RLC parameters on the frequency response.
Abstract: Frequency response measurements are used for power transformer winding failures detection. The variation between frequency responses indicate mechanical changes in the transformer winding. One method to investigate winding failures in transformer is to develop a reliable circuit model which can simulate the frequency response of an actual winding. The main reason to use the model is because it is expensive to create damages on an actual winding. This paper proposes n-stages circuit ladder network to simulate the response of a winding which has unique design. It presents a new technique to calculate the resistance, inductance and capacitance of the winding. Then, the relationship between the RLC parameters and the frequency response is studied. The winding chosen in this investigation is a single phase 33kV transformer winding. The simulated frequency response was compared with the measured response to verify the proposed model. The model can give a comprehensive understanding about the effect of RLC parameters on the frequency response.
13 citations
Cites methods from "Winding deformation analysis in pow..."
...A study conducted in [5] used finite element analysis to calculate the inductance and capacitance of the winding in order to investigate the winding deformation....
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01 Oct 2018
TL;DR: Voltage, current, and power based inrush detection and Power Differential Protection are applied and the hardware result confirms the effectiveness of the scheme for monitoring and protection of transformer.
Abstract: Due to deregulation of the power system, grid reliability becomes more complicated. Even, day by day small-scale and renewable power generation is inserted in a distribution system effectively due to people awareness. A power transformer is one of the most important equipment in the grid to reliably and efficiently transmit power to the consumers. Asset management and protection are the best concepts for enlargement of transformer lifespan as well as to increase grid reliability. This article reflects on electrical and other parameter based power transformer asset management. Voltage, current, and power based inrush detection and Power Differential Protection (PDP) are applied to protect the transformer. Various data such as load history, losses and temperature will be monitored in real time to enhance the working capability of the transformer. The proposed method adopts various electrical and nonelectrical parameters for condition monitoring. The proposed scheme is successfully tested on SkV A laboratory transformer using Arm CORTEX-M4 processor. A fitness function estimated from the collected data in the processor will reflect the condition of the transformer. The hardware result confirms the effectiveness of the scheme for monitoring and protection of transformer.
11 citations
Cites methods from "Winding deformation analysis in pow..."
...Short-Circuit Reactance (SCR) [19], the Finite Element Method (FEM) and Sweep Frequency Response Analysis (SFRA)[20] based techniques are widely used for winding deformation analysis....
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23 Apr 2015
TL;DR: In this article, a comparative study is made between models with different number of sections to obtain an optimal model for the high frequency behavior of power transformer, a lumped parameter equivalent circuit with multiple sections is widely used.
Abstract: High frequency response of power transformer is used to analyze winding deformation. To model the high frequency behavior of power transformer, a lumped parameter equivalent circuit with multiple sections is widely used. However, the accuracy and complexity of the model depends on the number of sections. In this paper, a comparative study is made between models with different number of sections to obtain optimal model.
1 citations
References
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Book•
01 Jan 2004
TL;DR: In this article, a reference illustrates the interaction and operation of transformer and system components and spans more than two decades of technological advancement to provide an updated perspective on the increasing demands and requirements of the modern transformer industry.
Abstract: This reference illustrates the interaction and operation of transformer and system components and spans more than two decades of technological advancement to provide an updated perspective on the increasing demands and requirements of the modern transformer industry. Guiding engineers through everyday design challenges and difficulties such as stray loss estimation and control, prediction of winding hot spots, and calculation of various stress levels and performance figures, the book propagates the use of advanced computational tools for the optimization and quality enhancement of power system transformers and encompasses every key aspect of transformer function, design, and engineering.
407 citations
"Winding deformation analysis in pow..." refers background in this paper
...During its course of life, it is subjected to various kinds of short circuit faults, which results in enormous electromagnetic forces in the windings [1]....
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...Even a simple asymmetry in winding structures makes the transformer more vulnerable to faults and may lead to complete failure in course of time [1], [2]....
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...3 and consists of series resistance ( s R ), series capacitance ( s C ), ground resistance ( g R ) and ground capacitance ( g C ), self-inductance ( ii L ) and mutual inductance ( j i M − ) [1] [9]....
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TL;DR: In this article, a frequency response analysis (FRA) method was used to measure wind deformation in power transformers, and the results indicated that benchmark reference data was not always necessary to identify certain kinds of mechanical damage.
Abstract: Winding deformation in power transformers can be measured externally using a new frequency response analysis (FRA) method Field experience since 1975, on five separate transformers up to 550 MVA rating, 230kVclassindicatesthatthismethod hasadvantagesover the low voltage impulse (LVI) method as a practical maintenance tool. Results on suspect transformers indicate that benchmark reference data is not always necessary to identify certain kinds of mechanical damage.
314 citations
TL;DR: In this article, the authors measured the impedance of transformer windings over a wide frequency range and compared the results with reference data using a network analyzer to sweep the frequency range, make the measurements, and analyze the results.
Abstract: This technique measures the impedance of transformer windings over a wide frequency range and compares the results with reference data The author used a network analyzer to sweep the frequency range, make the measurements, and analyze the results
202 citations
"Winding deformation analysis in pow..." refers background in this paper
...SFRA is performed by sweeping a constant magnitude sinusoidal signal with frequency varying from few Hz to MHz at the transformer terminal with secondary shorted [3], [4]....
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TL;DR: In this article, the authors present a method for calculating terminal and internal impedance versus frequency for a lumped parameter model of a transformer, where the transformer's total frequency response can be accurately determined from this impedance data directly, i.e., the terminal resonance and anti-resonance and internal amplification factor characteristic can be calculated for a single or three-phase transformer model.
Abstract: This paper presents a method for calculating terminal and internal impedance versus frequency for a lumped parameter model of a transformer The transformer's total frequency response can be accurately determined from this impedance data directly, ie, the terminal resonance and anti-resonance and internal amplification factor characteristic can be calculated for a single or three-phase transformer model Since most equipment associated with power system operation can be accurately modeled with lumped parameter networks, this method also provides an accurate, straightforward method for determining the resonance characteristic of those systems An additional significance of this method is that the accuracy of the calculation is limited only by the user's ability to represent the equipment or system Heretofore, the accuracy of this calculation was limited by the simplifying assumptions required of the network model by each solution method This paper presents the definitions and mathematical theory underlying the method Two examples are presented in which comparisons are made between measured and calculated values for a helical air core coil and a 200 MVA single-phase autotransformer The agreement is excellent
149 citations
TL;DR: In this paper, a custom high-power signal generator that injects high-frequency signals on the bushing tap of the transformer under investigation, as well as a circuit to replace the short bushing-tap short and allow online operation of the system is demonstrated on a 650 kV transformer.
Abstract: Online transformer condition monitoring techniques based on transfer function methods, such as transmission-line diagnostics and swept frequency-response analysis, require the injection of a known test signal into the transformer On larger power transformers, a practical method is to use the available bushing tap connection In this paper, we will discuss a custom high-power signal generator that injects high-frequency signals on the bushing tap of the transformer under investigation, as well as a circuit to replace the bushing tap short and allow online operation of the system Finally, the system is demonstrated on a 650 kV transformer
95 citations