Toshiba GR200 Series - Page 827

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 804 -
(b) Incoming voltage (V
i
)
V
r
V
i
Zero point (Δθ=0)
Advance time
Δθ
Time
α
β
Setting
T
CB
Vr − Vi
(c) Beat wave provided by V
r
+ V
i
(d) Advance time and CB closing command
Tolerance for synchronism
Zero point (Δθ=0)
CB closed point
CB closing command issued
CB closing command
CB contact
Start to close CB
End of closing CB
Figure 4.6-6 Advance time to close CB for an asynchronous system