Transformer Protection

Page 188

2007-08

Author: G. Ziegler

Copyright Siemens AG 2007. All rights reserved. PTD SE PTI

Transformer: Function principle and equivalent circuits

I1 U1

w1

w2

I2 U2

R1U1I1

X1

X 2'

R2 '

1 2

I

X

I2'

U 2'

Equivalent electromagnetic circuit

Equivalent electric circuit

I w + I w = I w1 1 1 2 2At load and short-circuit:

RTK

X TK

I