Title :
EHV transformer bank unbalance: practical issues and solutions
Author :
Gutman, R. ; Wagenaar, L.B.
Author_Institution :
American Electr. Power Service Corp., Columbus, OH, USA
fDate :
10/1/1996 12:00:00 AM
Abstract :
An unconventional tap configuration has been implemented in AEP´s South Canton 765/345/34.5 kV 3*500 MVA transformer bank to counter the combined effects of impedance mismatch within the bank and the natural unbalance of the EHV transmission system. These effects manifest themselves as unequal phase voltages and loadings and as elevated neutral and tertiary circulating currents in the bank, capable of reaching high magnitudes during heavy loading conditions. This paper describes the South Canton bank unbalance, the concerns it raised, and the actions taken by AEP to control its possible adverse effects on the integrity and operation of the South Canton Station (USA) facilities
Keywords :
load (electric); power system analysis computing; power system stability; power transformers; power transmission; transmission networks; 34.5 kV; 345 kV; 500 kVA; 765 kV; EHV transformer bank unbalance; EHV transmission system; USA; computer simulation; heavy loading conditions; impedance mismatch; neutral currents; power system unbalance; stability; tertiary circulating currents; unconventional tap configuration; unequal loading; unequal phase voltages; Counting circuits; Data acquisition; Impedance; Personnel; Phase transformers; Power cables; Power transmission lines; Steady-state; USA Councils; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
