Toshiba GR200 Series Instruction Manual page 503

based on the busbar voltage as shown below:
ratio setting corresponding with scheme switch [SYN-VLine], and 'VT ratio
at busbar' is obtained from the actual one corresponding with the scheme
switch [SYN-VBus]. We shall see the scheme switches in the succeeding
section.
Frequency difference
(iii)
The frequency differences between the running voltage and the incoming voltage
(Δf1 and Δf2) are smaller than the SYN1 and SYN2 settings:
For SYN1 setting:
For SYN2 setting:
Note: When Off is set for the scheme switch [SYN1-dfEN], the VCHK abandons
the frequency difference condition from synchronism requirements.
Similarly, the frequency difference condition is not valid when [SYN2-dfEN]
= Off.
Phase angle difference
(iv)
The phase differences between the running voltage and the incoming voltage (θ1
and θ2) are smaller than the SYN1 and SYN2 settings:
For SYN1 setting:
For SYN2 setting:
Notice and tips
(v)
If the frequency difference between the V L and the V B is shown very large, the
VCHK may fail to make the decision for the synchronism, although Off is set for the
[SYN1-dfEN] to abandon checking the frequency difference. This is because; the
vector passes the [SYN1-Angle] zone very quickly. As a result, the VCHK may fail
to issue the permission command. To avoid the failure, the user has to set values for
settings [SYN1-Angle] and [T_SYN1] depending on the assumed frequency
difference (Δf):
VT ratio at Line
K =
VT ratio at busbar
whereas, 'VT ratio at Line' is obtained from the actual value in VCT
Δf1 ≥ | fV B − fV L | ≤ [SYN1-df]
Δf2 ≥ | f L2 − fV L | ≤ [SYN2-df]
V B × V L cosθ1 ≥ 0
V B × V L sin ([SYN1-Angle]) ≥ V B × V L sin θ1
V L2 × V L cosθ2 ≥ 0
V L2 × V L sin ([SYN2-Angle]) ≥ V L2 ×V L sin θ2
Setting [SYN1-Angle]
∆f >
180° × Setting [T_SYN1]
- 480 -
6F2S1914 (0.49)
(2.35-1)
GRL200 (Soft 033 & 037)