Irig-B - GE L90 Instruction Manual

3.2 WIRING
c) 100BASE-FX FIBER OPTIC PORTS
Ensure that the dust covers are installed when the fiber is not in use. Dirty or scratched connectors can lead to high
losses on a fiber link.
NOTE
The fiber optic communication ports allow for fast and efficient communications between relays at 100 Mbps. Optical fiber
can be connected to the relay supporting a wavelength of 1310 nm in multi-mode.
The fiber optic port is designed such that the response times do not vary for any core that is 100 µm or less in diameter,
62.5 µm for 100 Mbps. For optical power budgeting, splices are required every 1 km for the transmitter/receiver pair. When
splicing optical fibers, the diameter and numerical aperture of each fiber must be the same.
3
IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices within
1 millisecond. The IRIG time code formats are serial, width-modulated codes that can be either DC level shifted or ampli-
tude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment can use a GPS
satellite system to obtain the time reference so that devices at different geographic locations can be synchronized.
Using an amplitude modulated receiver causes errors up to 1 ms in event time-stamping.
NOTE
Using an amplitude modulated receiver also causes errors of up to 1 ms in metered synchrophasor values.
NOTE
3-24
Observing any fiber transmitter output can injure the eye.
Figure 3–26: IRIG-B CONNECTION
L90 Line Current Differential System
3 HARDWARE

3.2.10 IRIG-B

GE Multilin