상황
A project engineer specifying a medium-voltage switchroom for an industrial site needs an SLD for the permit package.
이 도면에 담긴 내용
그 이면의 의사결정을 읽어 보세요.
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.