Transient and harmonic voltages associated with automated capacitor switching on distribution systems

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5539608

Rizy, D T; Gunther, E W; McGranaghan, M F

One of the functions proposed for distribution system automation is automated capacitor switching to control power factor and voltage profile on feeder circuits. This is one of the functions being implemented as part of the Athens Automation and Control Experiment on the Athens Utilities Board (AUB) in Athens, Tennessee. A concern with automated capacitor switching is the increase in harmonic and transient voltages due to different capacitor configurations on the distribution system. A study was performed to evaluate the impact of the automated capacitor switching on the AUB distribution system. The study has identified problem areas, methods for determining the problem areas and possible solutions. The substation capacitor banks were found to be the dominant factor in both the transient and harmonic responses of the distribution system. The harmonic response of the system is dominated by the parallel inductance/capacitance of the circuit comprised of the substation capacitor and equivent source reactance at the substation. The transient analyses found that when the substation capacitor is energized, magnified transient voltages can occur at switched in feeder capacitors. An evaluation of the effect of automated capacitor switching is necessary to properly design tha automated capacitor switching schemes and the required arrester protection for any harmonic and/or transient overvoltage contingency.

• Research Organization: Oak Ridge National Lab., TN (USA); McGraw-Edison Co., Canonsburg, PA (USA). Power Systems Div.
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5539608
• Report Number(s): CONF-860964-3; ON: DE86008882
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AUTOMATION
CAPACITORS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
EQUIPMENT
FEDERAL REGION IV
HARMONICS
NORTH AMERICA
OSCILLATIONS
POWER DISTRIBUTION SYSTEMS
POWER SUBSTATIONS
TENNESSEE
TRANSIENTS
USA