A fault on a transmission line leads to opening of both ends circuit breakers to isolate the fault from rest of the power system. Majority of faults on a transmission line are temporary as the arc extinguishes itself after certain time. In view of this, fixed time delay based automatic reclosure techniques are generally used for circuit breakers to reduce the interruption time and enhance reliability of power system. However, a fixed time delay based automatic reclosure technique will be unsuccessful in permanent faults, which takes hours/days to clear the fault through manual intervention. Reclosure of circuit breakers on fault may not only damage substation equipment adversely affecting their life span but also create a de-stabilizing impact on the power system due to fault.
The focus of this research is to understand the transients in a transmission system for different fault types. Two kinds of transmission systems, with and without shunt reactors connected to the transmission line are considered. Based on the analysis, new simple and easily implementable Adaptive Automatic Reclosure techniques have been developed to accomplish reclosure only when the fault is cleared and block reclosure when the fault is permanent. The techniques have been illustrated using Electro Magnetic Transient Program (EMTP) simulations and the affecting parameters have been studied using equations. The universal nature of certain techniques has been illustrated by applying it on various fault types. The techniques are also validated by applying on actual fault records from New York Power Authority’s transmission system.
Application of the developed techniques have also been extended to underground cables, transposed transmission lines, multi-tower multi-circuit transmission lines. Further, these techniques can be implemented in existing protection relays or in external devices without the need of sophisticated equipment. In addition, these approaches will provide more efficient and reliable means of automatic reclosure of transmission lines for different types of fault conditions by improving the reliability of power system and preventing the damage to the substation equipment due to unsuccessful reclosure attempts.
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|Advisor:||De Leon, Francisco, Shperling, Ben|
|Commitee:||Arnold, Stephen, Czarkowski, Dariusz, Fardanesh, Bruce, Shalabi, Khalil, Zabar, Zivan|
|School:||Polytechnic Institute of New York University|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- New York|
|Source:||DAI-B 76/12(E), Dissertation Abstracts International|
|Subjects:||Electrical engineering, Electromagnetics|
|Keywords:||Adaptive reclosure, Automatic reclosing, Detection of temporary and permanent, Fault clearance detection, Single pole adaptive reclose, Transmission lines|
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