For the distribution substation given in .9, assume that

Chapter , Problem 14.1

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For the distribution substation given in 14.9, assume that each of the four circuit breakers on the 12.5-kV side of the distribution substation transformers has a maximum continuous current of 2,000A/phase during both normal and emergency conditions. Determine the summer allowable substation rating under the single-contingency loss of one transformer, based on not exceeding the maximum continuous current of these circuit breakers at 12.5-kV operating voltage. Assume a 5% reduction for unequal transformer loadings. Comparing the results of this problem with 14.9, what limits the substation allowable rating, the circuit breakers or the transformers?

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