A Novel Transient Differential Protection Based on Projection Transform Model

A novel transient differential protection based on approximation and z-transform theorems is proposed in this paper. The differential function relates to time is firstly approximated to convolution of the projection of differential operator and the function itself, subsequently the digital equation...

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Bibliographic Details
Published in2010 Asia-Pacific Power and Energy Engineering Conference pp. 1 - 6
Main Authors Tan Yu-zhen, Ha Heng-xu, Bo, Z Q
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.03.2010
Subjects
Convolution
Differential equations
Impedance
Power system protection
Power system transients
Power transmission lines
Sampling methods
Surge protection
Transient analysis
Voltage
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Summary:A novel transient differential protection based on approximation and z-transform theorems is proposed in this paper. The differential function relates to time is firstly approximated to convolution of the projection of differential operator and the function itself, subsequently the digital equation of transmission line is established. The z-transform is employed to obtain the solution of the sampling equation, by which the propagation function and surge impedance in z domain are obtained. The impulse response of propagation function and surge impedance are solved by the zero-pole estimation method, therefore the simplified differential protection for distributed parameter line has been established. The EMTP simulations associated to a typical transmission system show that the algorithm is right and accuracy.
ISBN:1424448123
9781424448128
ISSN:2157-4839
DOI:10.1109/APPEEC.2010.5449332