Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2006-02-21
2006-02-21
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
07002784
ABSTRACT:
The present invention relates to a method for current compensation of a protection system for protecting a zone in a power system, which zone comprises a number of transmission lines connected to power sources and a number of transmission lines connected to a number of loads where the power sources and the loads are arranged outside the zone and a number of current transformers (CT) arranged to the transmission lines, wherein the method comprises the steps of continuously measuring all the incoming currents (Iin) to the zone, continuously measuring all the outgoing currents (Iout) from the zone, continuously calculating the differential current (Id) according to Id=Iin−Iout, continuously calculating q=Iout/Iin, continuously comparing q with set values and continuously comparing Ioutwith a set value Set1. The invention is characterised by setting Iout=Iin=Icompat the instant when q changes and Ioutexceeds the value set1, which is an indication of the occurrence of a fault external to the protection zone due to saturation of the CT of the faulted outgoing transmission line, and using the value Icompin the protection system in order to prevent tripping of the protection system. The present invention also relates to a device and a computer program product for performing the method.
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Gajic Zoran
Goransson Mikael
Wang Jianping
ABB AB
Benenson Boris
Dykema Gossett PLLC
Sircus Brian
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