GE L30 User Manual

GE Multilin L30 Line Current Differential System 8-9
8 THEORY OF OPERATION 8.1 OVERVIEW
8
Time stamp values are snapshots of the local 256 bit sample counter taken at the time of the transmission or receipt of the
first message in a time stamp sequence. This could be done either in software or hardware, provided the jitter is limited to
less than plus or minus 130 μs. A fixed bias in the time stamp is acceptable, provided it is the same for all terminals.
Figure 8–2: ROUND TRIP DELAY AND CLOCK OFFSET COMPUTATION FROM TIME STAMPS
831729A2.CDR
Relay 1
Send T2
i-3
Clocks mismatch
Send T1
i-2
Send T2 i
-
2
Send T1i-1
Send T2i-1
Store T2i-2
Store T1i-2
Capture T2 T1i-1, i
T1i
Capture T1 T2i-1, i
T2i
Slow down
Speed up
Send T1
i-3
Store T1i-3
Store T2i-3
Capture T1i-2
T1i-2
8.3 ms
8.3 ms
Capture T2i-2
T2i-2
T1i-1
T2 i-1
( T1 T2 T2 T1 )i-3, i-2, i -1, i
( T2 T1 T1 T2 )i-3, i-2, i-1, i
Calculate 1, 1.δθ
Calculate 2, 2.δθ
COMMUNICATION PATH
t2
t1
Relay 2
8.3 ms
8.3 ms
8.3 ms

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English