132
400
350
300
250
200
150
100
50
0
V
igct
(V)
4.0
3.0
2.0
1.0
0.0
t(ms)
1200
1000
800
600
400
200
0
I
igct
(A)
V
igct
I
igct
Figure 82 IGCT turn-on switching waveforms. IGCT were turned on at a voltage
positive voltage peak
B.4 Momentary Service Interruption
Figure 83 sho ws an 8.5 cycle momentary service interruption of a 75 hp 4 pole induction
motor. The motor was running at rated current and voltage at the time of the interruption.
The top graph shows the motor voltage and the bottom graph shows the motor current. At
time = 0, the momentary service interruption is initiated by opening the IGCTs, thereby
disconnecting the motor from the supply voltage. 8.5 cycles later, the IGCTs are closed,
reconnecting the motor to the supply voltage.
Summary :
132 400 350 300 250 200 150 100 50 0 V igct (V) 4.0 3.0 2.0 1.0 0.0 t(ms) 1200 1000 800 600 400 200 0 I igct (A) V igct I igct Figure 82 IGCT turn-on switching waveforms.
Tags :
motor,oltage,igct,interruption,momentary,serice,graph,shows,time,supply,figure,200,400