Digital communication channel interface
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United States of America Patent
Stats
-
Nov 30, 1993
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 3, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A differential protective relay system includes protective relays 19A and 19B at the terminals of a protected transmission line segment 21. Analog signals QL1 and QL2 are sampled at the respective ends of the protected line segment 21, digitally encoded using delta modulation and biphase-mark encoding, multiplexed and transmitted over a 1.544 Mbps T1 communication channel 20 to the other end of the line where they are decoded and compared with the local signal at that end. Power is removed from the protected line segment if the difference between the local and remote signals exceeds a predefined value. Biphase-mark encoding is employed so that a clock signal may be recovered from the decoded signals.
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