IEC 60060-1 Requirements in Impulse Current Waveform Parameters

There are IEC 60060-1 requirements on three impulse current waveforms. For the damped-oscillating waves, margins of the front time T1 and the time to half the peak T2 are 10 per cent whilst any value after the polarity reversal has to be less than 20 per cent of the peak value. Authors have tried to construct impulse current calibrator for reference measuring system, which would generate a waveform having the time parameters quite close to ideals. After numerous simulations in selecting values for circuit composing components, authors came to an impression that a damped-oscillating current generator whose output waveform has parameter values close to standard, cannot be realised. In the paper, authors' "impression" is theoretically proved and mathematically possible margins for the parameters are to be presented in detail.

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Parameters Determination of Oscillatory Impulse Current Waveform

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.130.265 ◽

2010 ◽

Vol 130 (3) ◽

pp. 265-271 ◽

Cited By ~ 1

Author(s):

Shuji Sato ◽

Seisuke Nishimura ◽

Shingo Seki

Keyword(s):

Current Waveform ◽

Impulse Current

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Design of multi-component impulse current generator for practical lightning current simulation

2014 International Conference on Lightning Protection (ICLP) ◽

10.1109/iclp.2014.6973136 ◽

2014 ◽

Cited By ~ 3

Author(s):

Bing Wang ◽

Zheng-cai Fu ◽

Nan-nan Yan

Keyword(s):

Current Generator ◽

Lightning Current ◽

Impulse Current Generator ◽

Impulse Current

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A long duration impulse current generator for testing surge arresters in distribution systems

2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology ◽

10.1109/ecticon.2013.6559579 ◽

2013 ◽

Author(s):

Chatariya Prasertsang ◽

Nawakun Triuattanapiruk ◽

Peerawut Yutthagowith

Keyword(s):

Distribution Systems ◽

Current Generator ◽

Surge Arresters ◽

Long Duration ◽

Impulse Current Generator ◽

Impulse Current

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Probability distributions of COVID-19 tweet posted trends use a nonhomogeneous Poisson process

International Journal of Quantitative Research and Modeling ◽

10.46336/ijqrm.v1i4.94 ◽

2020 ◽

Vol 1 (4) ◽

pp. 229-238

Author(s):

Devi Munandar ◽

Sudradjat Supian ◽

Subiyanto Subiyanto

Keyword(s):

Social Media ◽

Poisson Process ◽

Exponential Distribution ◽

Probability Distributions ◽

Nonhomogeneous Poisson Process ◽

Time Interval ◽

Initial State ◽

Time Intervals ◽

Time Parameters ◽

Parameter Values

The influence of social media in disseminating information, especially during the COVID-19 pandemic, can be observed with time interval, so that the probability of number of tweets discussed by netizens on social media can be observed. The nonhomogeneous Poisson process (NHPP) is a Poisson process dependent on time parameters and the exponential distribution having unequal parameter values and, independently of each other. The probability of no occurrence an event in the initial state is one and the probability of an event in initial state is zero. Using of non-homogeneous Poisson in this paper aims to predict and count the number of tweet posts with the keyword coronavirus, COVID-19 with set time intervals every day. Posting of tweets from one time each day to the next do not affect each other and the number of tweets is not the same. The dataset used in this study is crawling of COVID-19 tweets three times a day with duration of 20 minutes each crawled for 13 days or 39 time intervals. The result of this study obtained predictions and calculated for the probability of the number of tweets for the tendency of netizens to post on the situation of the COVID-19 pandemic.

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Research on Output Waveform of Generator with Rectifier Load considering Commutation Overlap Angle

Mathematical Problems in Engineering ◽

10.1155/2021/9920703 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Bingyi Zhang ◽

Gongfei He ◽

Guihong Feng

Keyword(s):

Circuit Simulation ◽

Harmonic Distortion ◽

Simulation Method ◽

Conduction Time ◽

Current Waveform ◽

Voltage Waveform ◽

Rectifier Circuit ◽

Output Waveform ◽

Output Side ◽

Distortion Rate

The purpose of this paper is to study the influence of the uncontrolled rectifier circuit on the generator’s output waveform when considering the commutation overlap angle. Taking the nonsalient permanent magnet (PM) generator directly connected with the uncontrolled rectifier circuit as an example, the equivalent circuit of the generator with rectifier load is established, and the commutation process of the rectifier circuit is analyzed when the effect of the commutation overlap angle is considered. The output waveforms of generator’s output side are obtained by analytical method, circuit simulation method, field-circuit coupled simulation method, and experimental method. The validity of the analysis methods is demonstrated by comparison. According to the results of analytical analysis, we know the characteristics of the output waveform under the influence of the commutation overlap angle. The existence of the commutation overlap angle will cause the voltage waveform to concave or convex, prolong the conduction time of the winding, and result in phase difference between the voltage waveform and current waveform. The influence of synchronous inductance and extra inductance on the output waveforms and harmonic distortion rate is analyzed. The research of this paper provides a theoretical basis for improving the output waveform of the generator with rectifier load.

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An Electronic, Adjustable-Waveform Current Generator for Use with a Quarter-Wave Resonant Spark Source

Applied Spectroscopy ◽

10.1366/0003702794925309 ◽

1979 ◽

Vol 33 (5) ◽

pp. 463-467 ◽

Cited By ~ 6

Author(s):

Tsutomu Araki ◽

John P. Walters

Keyword(s):

Discharge Current ◽

Repetition Rate ◽

Current Waveform ◽

Current Generator ◽

Fast Scr ◽

Quarter Wave ◽

Ladder Network ◽

Discharge Chemistry ◽

Network Functions ◽

A Current

A newly designed current generator for use with a quarter-wave spark source for a fundamental spectroscopic study of spark discharge chemistry is described. The generator outputs a trapezoidal discharge current waveform whose duration and amplitude are adjustable independently of the source repetition rate up to 5 μsec and 30 A, respectively. A multi-π section LC ladder network and a fast SCR are combined for the new generator to produce the adjustable discharge current waveform, in place of a single RC filter for a conventional current generator. The LC network functions as a current width stretcher and the SCR shapes the pulse into the desired duration by shunt clipping the tail. To evaluate the performance of the new current generator, transient emission waveforms of Cu lines are compared for a trapezoidal current waveform and a simple relaxation discharge waveform with that generated from the conventional generator.

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