THE USE OF DIFFERENTIAL RELAYS IN PROTECTION OF OVERHEAD LINES

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The topic of the lecture will be longitudinal differential protection of transmission lines. Until recently, distant protection was the basic overhead line protection, as it is the only one that provides selectivity in looped, multi-powered networks. Differential protection, as the most sensitive and the fastest protection, was limited to short lines due to the need for telecommunication connection of relays at the line ends. With the use of OPGW, the length of the lines ceases to be a limiting factor for the application of longitudinal differential protection on overhead lines. The use of differential protection also introduces some disadvantages of this protection, such as the effect of saturation of current transformers, reduced sensitivity due to limited fault current due to high transient resistance at the fault site or due to limited earth fault current in medium voltage networks. Renowned world manufacturers of protective devices offer various solutions for these problems, which will be discussed and analysed in the lecture. The analysis of the differential relays operation in the protection of overhead lines is not intended only for experts in the field of relay protection, but also for other electrical engineers.



  Date and Time

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https://meet.google.com/jed-vtxi-zuo

  • Banja Luka, Republika Srpska
  • Bosnia & Herzegovina

Staticmap?size=250x200&sensor=false&zoom=14&markers=44.7720845%2c17
  • Co-sponsored by Faculty of Electrical Engineering, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
  • Starts 31 March 2021 11:00 AM
  • Ends 01 April 2021 01:00 PM
  • All times are Europe/Belgrade
  • No Admission Charge
  • Register


  Speakers

Zoran Stojanovic of Faculty of Electrical Engineering, University of Belgrade, Serbia

Topic:

THE USE OF DIFFERENTIAL RELAYS IN PROTECTION OF OVERHEAD LINES

The topic of the lecture will be longitudinal differential protection of transmission lines. Until recently, distant protection was the basic overhead line protection, as it is the only one that provides selectivity in looped, multi-powered networks. Differential protection, as the most sensitive and the fastest protection, was limited to short lines due to the need for telecommunication connection of relays at the line ends. With the use of OPGW, the length of the lines ceases to be a limiting factor for the application of longitudinal differential protection on overhead lines. The use of differential protection also introduces some disadvantages of this protection, such as the effect of saturation of current transformers, reduced sensitivity due to limited fault current due to high transient resistance at the fault site or due to limited earth fault current in medium voltage networks. Renowned world manufacturers of protective devices offer various solutions for these problems, which will be discussed and analysed in the lecture. The analysis of the differential relays operation in the protection of overhead lines is not intended only for experts in the field of relay protection, but also for other electrical engineers

Biography:

Zoran Stojanović received his Dipl.Ing. (2003), M.Sc. (2009) and Ph.D. (2012) Degrees from the Faculty of Electrical Engineering, University of Belgrade. From 2003 to 2004, he worked in the project bureau at Energoprojekt-Hidroinženjering. In 2004, he became a Teaching Associate and since then he has been working at the Faculty of Electrical Engineering, University of Belgrade. In 2009, he was elected as a Teaching Assistant, in 2013 as an Assistant Professor, and in 2018 as an Associate Professor. He currently works as an Associate Professor and teaches the following courses: High Voltage Substations, Relay Protection, Digital Relay Protection and Electrical Measurement of Non-Electrical Quantities. As a visiting professor, he is engaged at the Faculty of Electrical Engineering, University of Banja Luka, where he teaches the subjects Protection of Power Systems and Protection of Distribution and Industrial Networks, as well as at the Faculty of Technical Sciences, University of Novi Sad, where he teaches High Voltage Substations and Selected Chapters in High Voltage Substations. Areas of his research work are relay protection, digital signal processing, high voltage switchgear, monitoring and diagnostics of high voltage equipment.

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