NDLI: Influences of input impedance of oscilloscope on the accuracy of switching overvoltage measuring system

Content Provider	IET Digital Library
Author	Sun, Qiuqin Yan, Joseph Wang, Feng Li, Qingmin Chen, She
Abstract	The accuracy of switching overvoltage measuring system is significantly affected by the input impedance of oscilloscope. First, the principle of switching overvoltage is presented, followed by a brief introduction to the structure of measuring system. Using the laplace transform, the transfer function of the measuring system is then derived. Its frequency response, ranging from DC to 1 GHz, is investigated in detail. The influences of the input impedance on the amplitude and phase angle responses are clearly revealed. Two typical cases, i.e. unit step response and sinusoidal step response, are also considered in the study. To validate the above analysis, a series of experiments has been performed at a substation. Both the theoretical analysis and the experimental results indicate that the input impedance affects the accuracy of switching overvoltage measuring system significantly. In the case that the impedance is rather small, the voltage waveform displayed on oscilloscope would be considerably distorted from the one stressed on the line. The impedance should be greater than 107 Ω to satisfy the accuracy requirement. On the other hand, it can be also used as a direct indicator to assess the performance of oscilloscope.
Starting Page	2496
Ending Page	2503
Page Count	8
ISSN	17518687
Volume Number	10
e-ISSN	17518695
Issue Number	Issue 10, Jul (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/10/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2015.1358
Journal	IET Generation, Transmission & Distribution
Publisher Date	2016-07-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplitude Response Display, Recording And Indicating Instruments Frequency Response Integral Transforms Laplace Transform Laplace Transforms Oscilloscope Input Impedance Oscilloscope Performance Assessment Oscilloscopes Overvoltage Protection Phase Angle Response Power System Insulation Coordination Power System Measurement Power System Measurement And Metering Power System Protection Sinusoidal Step Response Substation Switching Overvoltage Measuring System Transfer Function Unit Step Response
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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