Handbook of Electrical Engineering

504 HANDBOOK OF ELECTRICAL ENGINEERING

These reactance and time constants can now be used to replace their corresponding ones in the
equation for the short-circuit current in phase A of the motor,ia, as previously used for a generator.

As with the generator short circuit, the worst-case condition of the equation for the motor is
when the switching angleφois zero. The equation becomes:-

Ia=Vpk





[

1

X′′

−

1

X′

]

exp

−t

T′′+

1

X′

exp

−t

T′′



cos(ωt)+Vpk^1

X′′

exp

−t

Ta ( 20. 36 )

Figure 20.4 was drawn from equation (20.36).

References

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