Specifications
3-phase 2-phase L-L 1-phase L-N
Voltage Facto
r
Voltage Facto
r
x 1.00 x 0.87 x 1.30
380
v
X 1.00 416
v
X 1.00 x 1.00 x 1.80 x 3.20
400
v
X 1.05 440
v
X 1.06 x 1.00 x 1.50 x 2.50
415
v
X 1.09 460
v
X 1.10 10 sec. 5 sec. 2 sec.
440
v
X 1.16 480
v
X 1.15
The sustained current value is constant irrespective
of voltage level
Three-phase Short Circuit Decrement Curve. No-load Excitation at Rated Speed
Based on star (wye) connection.
Max. sustained duration
A
ll other times are unchanged
Instantaneous
Sustained
Minimum
HCI434F/444F
50Hz 60Hz
Sustained Short Circuit = 1,750 Amps
Sustained Short Circuit = 2,000 Amps
Note 1
The following multiplication factors should be
used to adjust the values from curve between
time 0.001 seconds and the minimum current
point in respect of nominal operating voltage :
Note 2
The following multiplication factor should be used to convert the
values calculated in accordance with NOTE 1 to those applicable
to the various types of short circuit :
Note 3
Curves are drawn for Star (Wye) connected machines. For other
connection the following multipliers should be applied to current
values as shown :
Parallel Star = Curve current value X 2
Series Delta = Curve current value X 1.732
50
Hz
60
Hz
100
1000
10000
0.001 0.01 0.1 1 10
TIME (secs)
CURRENT (Amps)
SYMMETRICAL
ASYMMETRICAL
100
1000
10000
0.001 0.01 0.1 1 10
TIME (secs)
CURRENT (Amps)
SYMMETRICAL
ASYMMETRICAL
7