Device protection using temperature compensation

Details Device protection using temperature compensation Device protection using temperature compensation

2011-08-02

2011-08-02

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

C361S079000

Reexamination Certificate

active

07990668

ABSTRACT:
Device protection using temperature compensation. A logic module associated with groups of capacitors adjusts complex impedance planes associated with the capacitor groups to account for ambient temperature variations. In particular, the logic module is configured to adjust a center of a circle of each complex impedance plane based on an average impedance. The average impedance for a selected capacitor group includes impedance measurements for groups other than the selected group, to prevent capacitor failures in that group from skewing the average. The logic module can adjust the circle center in response to changes in average impedance over periods of time. For example, the logic module can filter measured differences in average impedance using a low pass filter, to distinguish slow impedance changes caused by temperature variations and rapid impedance changes caused by capacitor failures. The logic module can adjust the circle center in accordance with the filtered difference value.

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Cooper Power Systems, Edison Pro Relay Schemes, UCP-300 and -301 Capacitor Bank Protection Schemes, Electrical Apparatus, 160-40, Mar. 2000 © 1999, 2 pages.

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