MV fuses and Power Management System

[buddy91082]

Hello all.

When using switch and fuse for overcurrent protection on medium voltage systems, can you control the fuse and switch through a power management systems as easy as you could with using a circuit breaker/relay scheme?

Thanks.
b

 

[rcw retired EE]

Only if the switch is motor operated and designed to open and close under load.

Selection depends on how often the circuit will be switched. Once or twice a year for maintenance, the switch/fuse will be accpetable. If it is once a week or twice a day, circuit breakers or fused contactors would be a better choice.

 

[davidbeach]

Can't control the fuse at all, but the switch can have a motor operator.

 

[buddy91082]

I would assume that the motor operator would add costs. Would the cost now be comparable to a MV breaker?

Woudl also assume that the vertical footprint gets higher.

Thanks.
b

 

[Bobngavan]

We have used ABB Versarupter MV switches with motor operators and shunt trip coils. The switch can be cycled open and closed remotely through your control logic. A shunt trip coil is also available. The switch is spring charged, activation of the electrically operated shunt trip coil releases the spring and opens the switch.They also have a blown fuse mechanism that will release the springs and open the switch if any fuse blows.