secondary selective type tech.

[ranlin]

7.2. Distribution System
Distribution systems shall be of the secondary selective type.
In secondary selective systems, the rating of all Equipment in the
distribution system shall be such that any one transformer or MCC feeder can be taken out of service without affecting the availability of the Plant.

secondary selective type - ?

Далее, кстати, есть еще такое место.

7.3. Two Transformer Secondary Selective
Automatic load transfer shall be based on loss of supply to either one of the supply transformers. Secondary short circuit levels shall be based on the contribution from motors on both bus bars and one transformer.