DocumentCode :
2284350
Title :
AEP experience with protection of three delta/hex phase angle regulating transformers
Author :
Thompson, Michael J. ; Miller, Hank ; Burger, John
Author_Institution :
Schweitzer Eng. Labs., Pullman, WA
fYear :
2007
fDate :
13-16 March 2007
Firstpage :
96
Lastpage :
105
Abstract :
American Electric Power installed three 138 kV, 150 MVA delta/hex phase angle regulating (PAR) transformers on the south Texas transmission grid during 2006. These transformers help optimize power flow on the transmission grid until planned 345 kV line construction projects can be completed to improve the strength of the grid in this portion of the power system. The delta/hex PAR transformer is a new single-tank design that promises to be much more economical to build and install than previous designs - improving the economic viability of deployment of these devices on the transmission grid. This paper addresses the challenges of providing fully redundant, sensitive, and secure protection for all types of faults, including turn-to-turn faults in this type of transformer and its surrounding bus work. The protection system includes a mix of conventional protection concepts and a completely new differential protection system that can compensate for the variable phase angle shift introduced by operation of the PAR transformer. The complete protection system was tested using digital model power system transient testing prior to installation in the field.
Keywords :
load flow; power grids; power transformer protection; power transmission faults; transient analysis; American Electric Power; differential protection system; digital model power system transient testing; economic viability; fault protection; south Texas transmission grid; three delta-hex phase angle regulating transformer protection; Equations; Load flow; Power generation economics; Power system modeling; Power system protection; Power system transients; Power systems; Power transmission lines; System testing; Transformers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Systems Conference: Advanced Metering, Protection, Control, Communication, and Distributed Resources, 2007. PSC 2007
Conference_Location :
Clemson, SC
Print_ISBN :
978-1-4244-0854-2
Electronic_ISBN :
978-1-4244-0855-9
Type :
conf
DOI :
10.1109/PSAMP.2007.4740903
Filename :
4740903
Link To Document :
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