transformer losses and exciting current are neglected, the transformer series reactance is .06 p.u At 3 pahse short circuit accurs on the line side of the circuit breaker when the generator is operated at rated terminate voltage and at no load. The breaker interrupts the fualt 3 cycles after fault inception neglect the effect of the tranformer on the generator time constants. Question (1)Determine the RMS ac symmetric fault current in p.u and kA after three cylces
Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
A three phhase generator, connected via a 1000 MVA transformer to a 345kv circuit breaker and a 345kv transmission line. The three phase generator is 1000 MVA 20 kv and 60 hertz . The reactances of the generator are
x''d=.14 p.u
x'd=.2 p,u
xd=1 p.u
The generators time constents
t''d=0.5
t'd=0.05
ta=.1 seconds
transformer losses and exciting current are neglected, the transformer series reactance is .06 p.u
At 3 pahse short circuit accurs on the line side of the circuit breaker when the generator is operated at rated terminate voltage and at no load. The breaker interrupts the fualt 3 cycles after fault inception neglect the effect of the tranformer on the generator time constants.
Question
(1)Determine the RMS ac symmetric fault current in p.u and kA after three cylces
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