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Directional harmonic overcurrent relay device

Patent ·
OSTI ID:5851364
;

This invention relates to a single- or multiple-phase directional relay device for monitoring of low levels of harmonic currents in an electric power system. The relay of this invention also employs adjustable taps for conveniently setting the minimum level of harmonic current corresponding to a condition of overcurrent, and provides a selection of time-overcurrent characteristic operating curves to delay the operation of the trip means once a condition of harmonic overcurrent has been detected. The relay is advantageous in that extremely low levels of harmonic overcurrent can be monitored so as to or prevent damage to a power system, and in that two harmonic currents may be monitored simultaneously.

Research Organization:
Department of the Interior, Washington, DC (USA)
Assignee:
Department of the Interior, Washington, DC
Patent Number(s):
US 7-349736
OSTI ID:
5851364
Country of Publication:
United States
Language:
English

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Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
CONTROL EQUIPMENT
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
EQUIPMENT
FREQUENCY MIXING
HARMONIC GENERATION
MEASURING INSTRUMENTS
MONITORS
OVERCURRENT
PERFORMANCE
POWER SYSTEMS
RELAYS