Improved estimates from the differential equation algorithm by median postfiltering
(1997) IEEE 6th International Conference on Developments in Power System Protection p.235238 Abstract
 Fast line relaying algorithms are motivated by the need to keep the fault clearing time as short as possible. Fast fault clearing reduces the risk for transient instability, thermal stress on equipment and risk for personnel injuries. There exists, at least, three different themes in transmission line protection: impedance algorithms differential equation algorithms (DEA); and travelling wave algorithms. This paper focuses on the differential equation algorithm. The paper presents the equations used in the differential equation algorithm. Both the continuoustime and the discretetime equations are given. The very poor estimates are explained by the equations determinant. At some isolated points the determinant approaches zero and the... (More)
 Fast line relaying algorithms are motivated by the need to keep the fault clearing time as short as possible. Fast fault clearing reduces the risk for transient instability, thermal stress on equipment and risk for personnel injuries. There exists, at least, three different themes in transmission line protection: impedance algorithms differential equation algorithms (DEA); and travelling wave algorithms. This paper focuses on the differential equation algorithm. The paper presents the equations used in the differential equation algorithm. Both the continuoustime and the discretetime equations are given. The very poor estimates are explained by the equations determinant. At some isolated points the determinant approaches zero and the equations become singular. This results in useless, often extreme, estimates. A simulation shows that a linear postfilter is unsuitable for this problem. To solve the problem we suggest a median postfilter. This filter type totally rejects the extreme values, and therefore produce fast and accurate estimates. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4589045
 author
 Akke, Magnus ^{LU} and Thorps, J S
 organization
 publishing date
 1997
 type
 Chapter in Book/Report/Conference proceeding
 publication status
 published
 subject
 keywords
 continuoustime equations determinant differential equation algorithm discretetime equations estimates improvement fast line relaying algorithms median postfiltering personnel injuries risk reduction short fault clearing time thermal stress reduction transient instability risk reduction
 host publication
 Sixth International Conference on Developments in Power System Protection (Conf. Publ. No. 434)
 issue
 434
 pages
 235  238
 publisher
 IEEE  Institute of Electrical and Electronics Engineers Inc.
 conference name
 IEEE 6th International Conference on Developments in Power System Protection
 conference location
 London, United Kingdom
 conference dates
 00010102
 external identifiers

 scopus:0030654115
 ISSN
 05379989
 ISBN
 0852966725
 DOI
 10.1049/cp:19970071
 language
 English
 LU publication?
 yes
 id
 6d72daa591414175a619b64936715ab2 (old id 4589045)
 alternative location
 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=608190
 date added to LUP
 20160401 16:39:32
 date last changed
 20200812 06:17:19
@inproceedings{6d72daa591414175a619b64936715ab2, abstract = {Fast line relaying algorithms are motivated by the need to keep the fault clearing time as short as possible. Fast fault clearing reduces the risk for transient instability, thermal stress on equipment and risk for personnel injuries. There exists, at least, three different themes in transmission line protection: impedance algorithms differential equation algorithms (DEA); and travelling wave algorithms. This paper focuses on the differential equation algorithm. The paper presents the equations used in the differential equation algorithm. Both the continuoustime and the discretetime equations are given. The very poor estimates are explained by the equations determinant. At some isolated points the determinant approaches zero and the equations become singular. This results in useless, often extreme, estimates. A simulation shows that a linear postfilter is unsuitable for this problem. To solve the problem we suggest a median postfilter. This filter type totally rejects the extreme values, and therefore produce fast and accurate estimates.}, author = {Akke, Magnus and Thorps, J S}, booktitle = {Sixth International Conference on Developments in Power System Protection (Conf. Publ. No. 434)}, isbn = {0852966725}, issn = {05379989}, language = {eng}, number = {434}, pages = {235238}, publisher = {IEEE  Institute of Electrical and Electronics Engineers Inc.}, title = {Improved estimates from the differential equation algorithm by median postfiltering}, url = {http://dx.doi.org/10.1049/cp:19970071}, doi = {10.1049/cp:19970071}, year = {1997}, }