Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1987-05-01
1989-08-29
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 87, 361 95, 361 97, H07H 308
Patent
active
048623083
ABSTRACT:
A power bus fault detector for detecting faults in a predefined portion of an electrical power bus having at least one phase. Power feed lines are coupled to the predefined portion of the power bus by circuit breakers. Current transformers are used to detect the current flowing through each phase of each power feed line which is coupled to the predefined portion of the power bus. A summer generates a current differential signal for each phase that is equal to the sum of the currents detected by the current transformers. A fault detector generates a trip signal which causes the feed line circuit breakers to disconnect the feed lines from the power bus when a fault is detected in the predefined portion of the power bus. The fault detector includes a detector which detects when the current differential signal in any of the power bus's phases is substantially nonsinusoidal in shape. In a preferred embodiment, the fault detector detects when, for any of the phases, the percentage of time that the magnitude of the current differential signal exceeds a fault cutoff value is greater than the percentage of time that the current differential value exceeds the fault cutoff value for a known minimum fault.
REFERENCES:
patent: 4315295 (1982-02-01), Zocholl
patent: 4550360 (1985-10-01), Dougherty
patent: 4571659 (1986-02-01), Demayer et al.
patent: 4703389 (1987-10-01), Scott
Electric Power Research Institute Inc.
Jennings Derek S.
LandOfFree
Power bus fault detection and protection system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power bus fault detection and protection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power bus fault detection and protection system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2243957