Toshiba GRL150-100 Series Instruction Manual page 17

Default signal
No. Name
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
Note(∗): used in the relay system.
2.2.6 Synchronized Sampling
The GRL150 performs synchronized simultaneous sampling at all terminals of the protected line.
This synchronized sampling requires neither an external reference clock nor synchronization of
the internal clocks of the relays at different terminals.
The sampling synchronization is realized through timing synchronization control.
Timing synchronization
One of the terminals is selected as the time reference terminal and set as the master terminal. The
other terminal is set as the slave terminal. The scheme switch [SP.SYN] is used for the settings.
Note: The master and slave terminals are set only for the convenience of the sampling timing
synchronization. The GRL150s at both terminals perform identical protection functions and
operate simultaneously.
Timing synchronization is performed using the receiving time for a data frame.
To perform timing synchronization for the slave terminal, the timing signal is sent from the master
terminal to the slave terminal and the sampling time of the slave terminal relay is synchronized
with the receiving time at the slave terminal.
Master
terminal
Slave
terminal
2.2.7 Telecommunication Circuit
The GRL150 can be provided with two types of telecommunications interface, an electrical
interface (pilot wire) and a fibre optic interface. For pilot wire communication, GRL150 can be
applied to circuits up to 8 km in length on 0.9 mmφ pilot wire cable or up to 2.5 km length on 0.5
mmφ pilot wire cable.
Command
(send)
SUB2_COM1-S
SUB2_COM2-S
SUB2_COM3-S
SUB2_COM4-S
SUB2_COM5-S
SUB2_COM6-S
SUB2_COM7-S
SUB2_COM8-S
SUB2_COM9-S
SUB2_COM10-S
SUB2_COM11-S
SUB2_COM12-S
1
T dR
1
Sampling
timing
Figure 2.2.6.1 Timing Synchronization
⎯ 16 ⎯
Command Default signal
(receive) No.
SUB2_COM1-R1 --
SUB2_COM2-R1 --
SUB2_COM3-R1 --
SUB2_COM4-R1 --
SUB2_COM5-R1 --
SUB2_COM6-R1 --
SUB2_COM7-R1 --
SUB2_COM8-R1 --
SUB2_COM9-R1 --
SUB2_COM10-R1 --
SUB2_COM11-R1 --
SUB2_COM12-R1 --
2
2
6 F 2 S 0 8 2 8
Name
--
--
--
--
--
--
--
--
--
--
--
--
t
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