GE L30 Instruction Manual page 85

3 HARDWARE
The IRIG-B repeater provides an amplified DC-shift IRIG-B signal to other equipment. By using one IRIG-B serial connec-
tion, several UR-series relays can be synchronized. The IRIG-B repeater has a bypass function to maintain the time signal
even when a relay in the series is powered down.
Using an amplitude modulated receiver will cause errors up to 1 ms in event time-stamping.
NOTE
When IRIG-B is used as the time synchronization source for synchrophasors, the DC level shifted option must be
used in order to achieve the 1% Total Vector Error specified by the standard. If amplitude modulated IRIG-B is
NOTE
used, it results in a 20 to 25 degree error in the synchrophasor angle measurement. The IEEE 1588 Precision Time
Protocol can also be used to achieve accurate time synchronization for synchrophasor calculation.sing an ampli-
tude modulated receiver will also cause errors of up to 1 ms in metered synchrophasor values.
GE Multilin
Figure 3–26: IRIG-B REPEATER
L30 Line Current Differential System
3.2 WIRING
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