Method and system for communications channel delay asymmetry...

Details Method and system for communications channel delay asymmetry... Method and system for communications channel delay asymmetry...

2006-10-24

2006-10-24

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

Reexamination Certificate

active

07126800

ABSTRACT:
A method for compensating for communications channel delay asymmetry in a current differential protection system includes determining an apparent sampling clock offset for a communications channel, the apparent sampling clock offset between a first sampling clock and a second sampling clock configured within the current differential protection system. An apparent global positioning system (GPS) clock offset is determined for the communications channel, the apparent GPS clock offset between a plurality of GPS time stamps corresponding to the first and said second sampling clocks. A compensated clock offset is determined by subtracting the apparent GPS clock offset from the apparent sampling clock offset so as to cancel out a channel asymmetry component of deviation in the apparent GPS and sampling clock off-sets.

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GE Multilin Releases Channel Asymmetry Compensation Feature for the L90 Line Current Differential Relay, Jul. 2, 2002; GE Multilin, Power Management Lectronics.

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