Toshiba GR200 Series - (ii) Time synchronization

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 498 -
Figure 2.36-3 Three IEDs and setup
(ii) Time synchronization
When the user selects an IED as the master; the IED becomes the time reference. After the
selection, the sampling time difference between (∆T) is determined between the master and
the slave, as shown in Figure 2.36-4.
t
t
Master
IED_G
T
M
T
Slave
IED_H
T
d2
T
d1
T
F
T
T
A signal in downstream (IED_H to IED_G)
A signal in upstream (IED_G to IED_H)
(2) IED_G receives the signal.
(4) IED_H receives its own signal.
Sampling timing at IED_H
Sampling timing at IED_G
(1) IED_H sends a signal to IED_G.
(3) IED_G replay to IED_H with the signal received.
Figure 2.36-4 Sampling timing before synchronization
Figure 2.36-4 shows pre-synchronization circumstance between the master IED_G and
the slave IDE_H. The user can find that the sampling timings between are different. In order
that the IED_H synchronizes with the IED_G, accounting for the synchronization is provided
with process (1) to (4) of Figure 2.36-4.
IED_R
[TERM_TOPOLOGY] =3Term
Property: Slave
[TERM_ID] =3
[TERM_ID] =1
CH1 CH2
IED_G
[TERM_TOPOLOGY] =3Term
Property: Master
[TERM_ID] =2
IED_H
[TERM_TOPOLOGY] =3Term
Property: Slave
CH1 CH2
CH1 CH2