Transformer core and transformer selection of the difference
2016/11/13 view:
Transformer core As the main transformer high side and low side of the primary current and transformer different selection, in normal operation and external fault, into the protection device of the secondary current size is not exactly the same, which will give the differential Computing inconvenience. Therefore, in the transformer core longitudinal differential protection, the use of "equivalent" concept, that is, two unequal current (for differential components) the role of the same. Many books are introducing a balance factor to explain this problem. In fact, simply put, is the high side of the secondary current from the famous value, are converted into the side of the rated current as the standard value of the per-unit value. Transformer core in order to facilitate understanding, we can think: assume normal work, the transformer high and low side are running in rated conditions, even if the size of the two sides of the secondary current is different, but the side of the secondary rated current reference value, after conversion After the standard unitary value is 1, so that you can easily calculate the difference of 0.
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