Mbrooke
Electrical
- Nov 12, 2012
- 2,546
How much cost is saved over using fuses and load break switches instead of breakers and their associated control equipment?
Scenario:
34.5kv-12kv substation with two 15MVA transformers. "H" arrangement. 3 34.5kv load break switches and 2 35kv fuse sets. 11 15kv load break switches and 8 15kv fuse sets. 8 outgoing 12kv feeders.
VS the same in breakers, isolators, VTs, ect.
40-60 year in service life.
Second question but on a similar note: Are on board tap changers available which are self power or only need a 120 volt source? Ie tap control in transformer compartment.
Scenario:
34.5kv-12kv substation with two 15MVA transformers. "H" arrangement. 3 34.5kv load break switches and 2 35kv fuse sets. 11 15kv load break switches and 8 15kv fuse sets. 8 outgoing 12kv feeders.
VS the same in breakers, isolators, VTs, ect.
40-60 year in service life.
Second question but on a similar note: Are on board tap changers available which are self power or only need a 120 volt source? Ie tap control in transformer compartment.