シナリオ
A project engineer specifying a medium-voltage switchroom for an industrial site needs an SLD for the permit package.
この図に含まれるもの
図の背後にある意思決定を読み解く。
01
630 A / 31.5 kA incoming breaker rating must match the fault level declared by the utility.
02
PT and CT on the busbar provide inputs to numerical protection relays (overcurrent, earth fault).
03
Separate CBs for each outgoing circuit allow independent switching and IDMT protection coordination.
Add a bus-section breaker for a double-busbar arrangement; add a busbar protection relay for zone-selective protection.