Determining the Test Voltage Factor Function for the Evaluation of Lightning Impulses With Oscillations and/or an Overshoot

Simón, Pascual; Garnacho, Fernando; Berlijn, Sonja; Gockenbach, E.

doi:10.1109/tpwrd.2005.858807

Cited by 29 publications

(6 citation statements)

References 5 publications

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“…(2) These results are compared with the K-factor function expressed by (3) and the test results in the European Project [14] (3) Fig. 10 indicates the evaluation results of the K-factor values in the present experiment using the proposed method, together with the results for positive polarity and the results in the European Project.…”

Section: Discussion On K-factor Valuesmentioning

confidence: 96%

K-Factor Value and Front-Time-Related Characteristics in Negative Polarity Lightning Impulse Test for UHV-Class Air Insulation

Tsuboi

Ueta

Okabe

et al. 2013

IEEE Trans. Power Delivery

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In IEC-60060-1 as revised in 2010, a conversion method for lightning impulse voltage test waveforms using the test voltage function (K-factor function) was adopted. Presently, studies are being conducted on the test standards for ultra-high voltage (UHV)-class equipment. Since the existing K-factor function was established based on the experimental results for more small models compared with the insulation structure of UHV-class equipment, the issue has arisen as to whether this K-factor function can also be applied for UHV-class equipment. The authors experimentally obtained K-factor values using the largest possible model assuming UHV-class equipment in the previous studies. This paper reports the K-factor values and the insulation characteristics with respect to the front time obtained for air insulation under a negative-polarity lightning impulse voltage. According to the results of this experiment, even though the K-factor values for an air gap were likely to be slightly lower than the existing K-factor function in the negative polarity, the tendency of the change with respect to the superimposed oscillation frequency was similar. Furthermore, it was found that even though the breakdown voltage for waveforms with an extended front time was likely to decrease further than that for the standard lightning impulse waveforms, the decline was about 3.1% even for a front time of 4.8 s. Consequently, it was indicated that a lightning impulse voltage test waveform with an extended front time may help properly verify the insulation performance of a UHV-class air bushing.Index Terms-Air insulation, bushing, IEC 60060-1, K-factor, lightning impulse voltage test, test voltage function.

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Section: Discussion On K-factor Valuesmentioning

confidence: 96%

K-Factor Value and Front-Time-Related Characteristics in Negative Polarity Lightning Impulse Test for UHV-Class Air Insulation

Tsuboi

Ueta

Okabe

et al. 2013

IEEE Trans. Power Delivery

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“…As for the k -factor values, the measurement results in the European Project ("E.P.") were reported in the past and the uncertainty evaluated [28]. This result was apparently accompanied by significant uncertainty.…”

Section: Uncertainty In K-factor Measurementmentioning

confidence: 98%

“…The IEC 60060‐2 “High‐voltage test technique—Part 2: Measuring system” specifies evaluation of measurement uncertainty as one of the aspects of performance to be included in the system for measuring a high‐voltage test. As for the k ‐factor values, the measurement results in the European Project (“E.P.”) were reported in the past and the uncertainty evaluated [28]. This result was apparently accompanied by significant uncertainty.…”

Section: Insulating Test For Electric Power Equipmentmentioning

confidence: 99%

Research in High Voltage and Insulation Engineering of UHV‐Class Electric Power Equipment

Okabe

2023

IEEJ Transactions Elec Engng

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For ultra-high-voltage (UHV) systems together with high-voltage facilities, more rationalized insulation coordination and equipment design are required. To this end, making large-scale and long-term field lightning-strike observations, large amount of and practical experiments, and introducing new analysis techniques have enabled the development of advanced technologies capable of transforming conventional techniques. This paper reviews what has been developed in a Japanese electric power company in this regard.

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“…It was found that the iteration process of the Levenberg-Marquardt method has a long execution time for some waveforms with a high overshoot rate. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) There have been some attempts to overcome this problem. The double integration approach with weight functions (16) and the improved Prony method (17) have been proposed, although complicated calculations are required in these approaches.…”

Section: Introductionmentioning

confidence: 99%

Waveform Parameter Evaluation of Lightning Impulse Voltage Based on Neural Network Method

Tanthanuch¹,

Ludpa²,

Yutthagowith³

2021

Sensors and Materials

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We propose a new approach based on applying neural networks for the base curve fitting of full lightning impulse voltage waveforms. In the standard IEC 61083-2, the Levenberg-Marquardt algorithm is employed in the calculation of the base curve to evaluate the waveform parameters. In this study, multilayer neural networks were constructed to correct the base curve calculated by simple two-exponential fittings. The approach to constructing the networks divides the data into two groups: training data and testing data. The training data were collected from the standard waveforms generated by the test data generator of the standard, where there were 29 cases of full lightning impulse voltage waveforms. The testing data were collected from real experimental data with various overshoot rates. The waveform parameters obtained by the proposed method were compared with those obtained by the standard approach, and very good agreement was always observed. It was found that the proposed method provides very accurate waveform parameters within the acceptable tolerances of the standard. Also, the method has a shorter execution time than the standard method. Therefore, the proposed method is an attractive choice for evaluating lightning impulse voltage waveform parameters.

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Determining the Test Voltage Factor Function for the Evaluation of Lightning Impulses With Oscillations and/or an Overshoot

Cited by 29 publications

References 5 publications

K-Factor Value and Front-Time-Related Characteristics in Negative Polarity Lightning Impulse Test for UHV-Class Air Insulation

K-Factor Value and Front-Time-Related Characteristics in Negative Polarity Lightning Impulse Test for UHV-Class Air Insulation

Research in High Voltage and Insulation Engineering of UHV‐Class Electric Power Equipment

Waveform Parameter Evaluation of Lightning Impulse Voltage Based on Neural Network Method

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