Loading...

A new noise-immune method to detect protective CT saturation and its release instants

Borzooy, A ; Sharif University of Technology | 2017

688 Viewed
  1. Type of Document: Article
  2. DOI: 10.1109/ICPRE.2016.7871217
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2017
  4. Abstract:
  5. CT saturation is a phenomenon that can cause inaccurate fault current measurement and may result in related protective relay failure to block the high current flow under a fault condition in a power system. Hence, it is required to develop a method to detect occurrence of CT saturation with a good accuracy under presence of noise in a power system. In this paper, a new method having the afore-mentioned characteristics is presented. The main benefit of exploiting the introduced approach here for detecting CT saturation is its high level of reliability as well as its reasonable operational speed in CT saturation detection. In other words, these two properties are implemented to this method. Moreover, in addition to the conventional assumption in the past works to consider the fault current as the sum of one sinusoidal current component, and an exponential current component; it is assumed here that the fault current can also be in form of a double-exponential waveform as it is observed in some switching fault currents even if the lightning fault currents which preserve a very short duration are ignored. This is a new assumption which seems has not been analyzed in the past published works. In this paper first the existing CT saturation detection methods are classified, and then the new method with its formulation is presented. Finally this method is compared with some of the past published works through some simulations
  6. Keywords:
  7. CT ; Detection ; Determinant ; Noise ; Saturation ; Computerized tomography ; Electric current control ; Electric equipment protection ; Error detection ; Saturation (materials composition) ; CT saturation detection ; Double exponential ; Exponential current ; Fault conditions ; Lightning faults ; Sinusoidal currents ; Electric fault currents
  8. Source: 2016 IEEE International Conference on Power and Renewable Energy, ICPRE 2016, 21 October 2016 through 23 October 2016 ; 2017 , Pages 284-287 ; 9781509030682 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/7871217