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- Title
Maintenance of Three-phase Load Voltage during Single Phase Auto Reclosing in Medium Voltage Radial Distribution Lines.
- Authors
Basu, Kartik Prasad; George, Moley Kutty
- Abstract
Most faults in medium voltage (MV) distribution lines are temporary line to ground (LG) faults. Three-phase auto reclosing (TPAR) is commonly used to remove this fault with temporary disconnection of all the phases. Multi-shot single-phase auto reclosing (SPAR) may also be used to remove the LG fault. But it produces highly unbalanced and low voltage across the load during the reclosure dead time. It is proposed to connect a zigzag winding grounding transformer at the load bus to maintain the 3-phase load voltage when one phase opens during the SPAR. With low value of grounding resistance the 3-phase voltage during the SPAR dead time becomes approximately balanced. Directional over current relays may be used for the protection. Analysis of a MV radial distribution system having a zigzag transformer connected to the remotest load bus is presented with the computation of voltages during the dead time of SPAR.
- Subjects
ELECTRIC potential; VOLTAGE regulators; ELECTRIC power distribution; ELECTRIC lines; ELECTRIC transformers; ELECTRICAL load; POWER transmission; ELECTRIC power transmission; SINGLE-phase alternating currents; TWO-phase alternating currents
- Publication
International Journal of Emerging Electric Power Systems, 2011, Vol 12, Issue 4, p1
- ISSN
1553-779X
- Publication type
Article
- DOI
10.2202/1553-779X.2703