Prediction of the parameters of an impulse generator for transformer testing

Kannan, Sivasundari; Rao, Yu

doi:10.1049/piee.1973.0222

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Many papers have been published which deal with calculations and experimental studies of circuits that are used to generate the double-exponential impulse voltages (Nikolopoulos, 1983;Zhao et al, 1999;Rao, 1975, 1973;Del Vecchio et al, 2002;Malewski et al, 1994;Zhou and Boggs, 2004;Venkataseshalah and Sarma, 1991;Vahidi and Beiza, 2005;He and Zhu, 2006). Some of these papers investigated the effect of the load capacitance (Zhao et al, 1999), low-inductance winding (Kannan and Rao, 1975) and power transformers (Kannan and Rao, 1973;Del Vecchio et al, 2002;Malewski et al, 1994) on the output voltage of the impulse-voltage generators. No work has been done to get a general investigation of the effect of all types of loads on the generator output voltage.…”

Section: Introductionmentioning

confidence: 99%

Reconfiguration of impulse‐voltage generator for conducting standard lightning tests

Khalil.

Metwally

2008

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -Loading the impulse-voltage generator by test object can affect the generated voltage waveform. It is well known that reconfiguring these generators by changing the high-voltage resistors and capacitors, and even the connecting leads in the laboratory is too bulky and time consuming, especially for large test objects. The objective of this paper is to introduce a new computerized method to reconfigure the impulse-voltage generator in order to conduct the standard tests on any type of objects. Design/methodology/approach -A modified algorithm is introduced for solving the generalized equivalent circuit of impulse-voltage generators under any loading condition. Findings -The high efficiency of this algorithm has been verified by experimental investigations on different reduced-and full-scale loads, namely, resistive, inductive, capacitive or mixed. For reduced-scale loads up to a few kV, a single-stage impulse-voltage generator is used. While for full-scale loads, a multi-stage impulse-voltage generator is reconfigured to test a 33 kV neutral earthing reactor. The experimental responses are compared with the numerical results of the proposed program and checked out by the PSCAD simulation. Good agreement has been found between all of them. Practical implications -Knowing the exact value of the test object, some of the generator components and the connecting lead inductances is a must to apply this method. Originality/value -Reconfiguring of impulse-voltage generators by changing the high-voltage resistors and capacitors, and even the connecting leads in the laboratory is too bulky and time consuming, especially for large test objects. This work will certainly save time and efforts if it is applied correctly in high-voltage laboratories.

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Section: Introductionmentioning

confidence: 99%

Reconfiguration of impulse‐voltage generator for conducting standard lightning tests

Khalil.

Metwally

2008

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…Usually, the waveform is described as a sum of two exponential functions [2]: v(t) = V(e~a it -e~a 2t ) (1) Such a simple mathematical description may not be adequate always, as it does not correspond to the actual waveforms encountered in practical circuits such as the one shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in any analysis involving the current flow in the tested object, or in any other part of the circuit, the above simple formula must not be used. Many authors [1,[3][4][5] have worked on the problem of selecting the component values of the circuit to generate particular waveforms, taking the load impedance into account. It is also a fact that the same authors have analysed the problem of predicting the waveform when the component values are known.…”

Section: Introductionmentioning

confidence: 99%

Function representation of lightning impulse wave

Sobocki¹

1987

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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The paper presents mathematical descriptions which fit the front, the tail and the chopping of lightning impulses which correspond with real circuits. Values of the equation coefficients are calculated which depend on the wave shapes. The wavefront and the wave chopping are analysed, assuming an infinitely long tail and treating the tested device as a capacitance. The wavetail is analysed assuming the infinitely steep front. The tested device is then replaced by an inductance.

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A Simple Fast and Accurate Simulation Method for Power Transformer Lightning Impulse Test

Mirzaei

2019

IEEE Trans. Power Delivery

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Prediction of the parameters of an impulse generator for transformer testing

Cited by 4 publications

References 3 publications

Reconfiguration of impulse‐voltage generator for conducting standard lightning tests

Reconfiguration of impulse‐voltage generator for conducting standard lightning tests

Function representation of lightning impulse wave

A Simple Fast and Accurate Simulation Method for Power Transformer Lightning Impulse Test

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