Fusing of breaker DC tip/close ccts
Fusing of breaker DC tip/close ccts
(OP)
I'm talking about DC trip/close coils in primary switch gear typically found in a HV switchyard.
Do you folks typically fuse your DC circuits inside the relay building or at the breaker mech box? For example, we typically supply these ccts from a DC panel, the cct is fused inside the relay building, then sent to the breaker. We throw slugs in the mech box.
I'm just curious if anyone in the HV world is fusing at the mech box.
thanks!
Do you folks typically fuse your DC circuits inside the relay building or at the breaker mech box? For example, we typically supply these ccts from a DC panel, the cct is fused inside the relay building, then sent to the breaker. We throw slugs in the mech box.
I'm just curious if anyone in the HV world is fusing at the mech box.
thanks!






RE: Fusing of breaker DC tip/close ccts
RE: Fusing of breaker DC tip/close ccts
RE: Fusing of breaker DC tip/close ccts
In small distribution substations, the circuit will go DC+ to PCB to control house relay panel to PCB to DC-, which enables wire crews to isolate the PCB mech box by pulling the local fuses.
In larger substations, the voltage drop associated with the extra runs out & back is too high, so the +DC supply from the trip contacts comes directly from the relay panel an cannot be isolated by a switching device inside PCB mech box.
RE: Fusing of breaker DC tip/close ccts