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Analysis of Protection Malfunctioning in Meshed Distribution Grids

Analysis of Protection Malfunctioning in Meshed Distribution Grids. Evita PARABIRSING Dr. Edward COSTER Dr. Marjan POPOV Stedin- The Netherlands Stedin – The Netherlands TU Delft – The Netherlands

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Analysis of Protection Malfunctioning in Meshed Distribution Grids

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  1. Analysis of Protection Malfunctioning in Meshed Distribution Grids Evita PARABIRSING Dr. Edward COSTER Dr. Marjan POPOV Stedin- The Netherlands Stedin – The Netherlands TU Delft – The Netherlands evita.parabirsing@stedin.net edward.coster@stedin.net m.popov@tudelft.nl Paper 0374

  2. Presentation Overview • Introduction • Analysis of Short Circuits and Protection Relay Detection in a 25.6 kV Meshed Grid Section • Possible Solution Strategy • Conclusions Evita N. Parabirsing – The Netherlands – RIF Session 3 – Paper 0374

  3. Introduction • Problem definition: Short Circuit If_1 If = If_1 + If_2 If If_2 Directional Relay (DIR) mal-operation occurs in networks with similar construction

  4. Analysis of Short Circuits and Protection Relay Detection in a 25.6 kV Meshed Grid Section • 25.6 kV Meshed grid section IOC= overcurrent relay DIR= directional relay

  5. Analysis of short circuits and circulating fault currents If Short Circuit 0% 100% k Cable length = 1.97 km

  6. 0% 100% 30% If_2b If – If_2b 18 kA 14,5 kA 3,2 kA I> 840 A “Dead Zone”

  7. For all types of short circuits there are certain ‘dead zones’ available in the network, caused by low fault currents which are detected by the directional relay (DIR)

  8. Overview of ‘dead zones’ in the studied network

  9. Possible solution strategy • Is there a possibility that faults within the ‘dead zone’ could be detected by the I>>, Ie>> settings of the IOC relays ? Step 1: Detected fault currents for faults within ‘dead zone’

  10. Step 2: Detected fault currents for faults outside the protected area

  11. Proposed I>>, Ie>> and t>>, te>> settings of the IOC relays:

  12. conclusions • Analysis and Simulation results show that there exist ‘dead zones’ within the protected zones of the studied network • ‘Dead zones’ will always be available in network sections with single point of supply. The ‘dead zones’ are caused by the low magnitude of the fault current through the Directional relay • By activating and adjusting the I>>, Ie>> and t>>, te>> settings of the overcurrent protection relays in this study case, selective switching can be achieved for short circuits within ‘dead zones’

  13. Thank You Paper 0374: Analysis of Protection Malfunctioning in Meshed Distribution Grids Evita PARABIRSING Dr. Edward COSTER Dr. Marjan POPOV Stedin- The Netherlands Stedin – The Netherlands TU Delft – The Netherlands evita.parabirsing@stedin.net edward.coster@stedin.net m.popov@tudelft.nl

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