Delta PG-45 User Manual download pdf (Page 13)

3-phase 2-phase L-L 1-phase L-N

Voltage Factor Voltage Factor

x 1.00 x 0.87 x 1.30

380v X 1.00 416v X 1.00

x 1.00 x 1.80 x 3.20

400v X 1.07 440v X 1.06

x 1.00 x 1.50 x 2.50

415v X 1.12 460v X 1.12

10 sec. 5 sec. 2 sec.

440v X 1.18 480v X 1.17

UCI224D

50Hz 60Hz

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

All other times are unchanged

Instantaneous

Sustained

Minimum

Sustained Short Circuit = 230 Amps

Sustained Short Circuit = 275 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

100

1000

10000

0.001 0.01 0.1 1 10

TIME (secs)

CURRENT (Amps)

SYMME TRICAL

ASYMMETRICAL

100

1000

10000

0.001 0.01 0.1 1 10

TIME (secs)

CURRENT (Amps)

SYMME TRICAL

ASYMMETRICAL

1 2 ... 8 9 10 11 12 13 14 15 16 17 18

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Delta PG-45 User Manual Page 13

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