The secondary network will energize the primary feeder through the network transformer.
2.
Typically, network protectors are contained inside a submersible enclosure which is bolted to the throat of the network transformer and placed in underground vaults.
3.
The problem is that this primary cable is also connected to a network transformer, which is interconnected to other network transformers on its secondary side.
4.
The problem is that this primary cable is also connected to a network transformer, which is interconnected to other network transformers on its secondary side.
5.
Even without a fault, if the electric utility wants to perform maintenance on that primary cable, they must have a way to fully disconnect that primary cable, without worrying about the cable being energized by the secondary network through the network transformer.
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