Correct Way of Switching Voltage Inputs?

[mbrooke]

Which way is correct? Option A or Option B? Why so? ................

https://imgur.com/a/MDhBTqu

 

[paulengr]

I’m not getting it. For control power three options.

Option 1 is DC rectifiers on both busses. Only time you lose power is in a total outage.

Second option and usually recommended is a battery/UPS for substations with in this case dual chargers and blocking diodes so you can replace each UPS as needed although this is usually only done for very critical loads. Generators with ATS for instance don’t usually do this.

Third option is a capacitive trip device and/or a small battery. This gives you trip/close power for less than a minute.

In terms of switching the power side there are three options. First is two mains with open or closed transition. Second is main-tie-main or ideally double ties to work on one when needed. Third is ATS which is implemented as a double throw switch.

 

[winnie]

Option B has the operating mode of placing both inputs in parallel with no provision for synchronization.

This might cause rapid self disassembly of components....

Jon

 

[mbrooke]

I’m not getting it. For control power three options.

Option 1 is DC rectifiers on both busses. Only time you lose power is in a total outage.

Second option and usually recommended is a battery/UPS for substations with in this case dual chargers and blocking diodes so you can replace each UPS as needed although this is usually only done for very critical loads. Generators with ATS for instance don’t usually do this.

Third option is a capacitive trip device and/or a small battery. This gives you trip/close power for less than a minute.

In terms of switching the power side there are three options. First is two mains with open or closed transition. Second is main-tie-main or ideally double ties to work on one when needed. Third is ATS which is implemented as a double throw switch.

Its CVTs going into a relay.

 

[mbrooke]

Option B has the operating mode of placing both inputs in parallel with no provision for synchronization.

This might cause rapid self disassembly of components....

Jon

Right, but you wouldn't close isolater D2 with D! already closed unless the buscoupler between BB1 and BB2 was also closed.