A client who recently had a factory burn down following an electrical fault has asked me to carry out a discrimination study across his network at another plant. The supply is comprised of a 300kVA 400v TPN supply, MCCB main switchgear with 15 downstream type B MCB sub main boards.
The problem...
Gents,
Imagine 3 off 11kv/400V transformers feeding an LV switchboard with bus section switches between each section. All interlocked to prevent transformers operating in parallel. (2 from 3 scheme).
I say the bus section switches should be 4 pole to prevent earth fault circulating current and...
Gentlemen,
I am involved with the design of a water pumping station equipped with 3 centrifugal pumps fitted with 450kW (415V) each capable of delivering 112 l/s and the static head is 277 metres.
The contractor has proposed star delta starters but I understand that on delta transition the...
