A generator connected through 5 cycle CB to a transformer is rated 8000 kVA with the reactances of X₁ = 10 %, X = 16 % and X₁ = 100 %. It is operating at no load and rated voltage when 3 phase short circuit occurs between breaker and transformer. Find : i) sustained short circuit in breaker ii) the initial symmetrical rms current in breaker iii) maximum possible d.c. component of short circuit in breaker iv) the momentary current rating of the breaker v) current to be interrupted by breaker vi) the interrupting kVA
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 generator is connected through the 5 cycle circuit breaker to a transformer .
It is operating at no load and rated voltage when 3 phase short circuit occurs between breaker and transformer.
Given data,
Base KVA = 8000 KVA
reactance X"d = 10 %
Reactance X'd = 16%
Reactance Xd = 100%
We have been asked to find,
- Sustained Short circuit in breaker
- The initial symmetrical rms current in breaker
- Maximum possible dc component of short-circuit in breaker
- The momentary current rating of breaker
- Current to be interrupted
- The interrupting KVA
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