Hi All,
I'm having an issue with high voltage underground cable installation in a current project. The cable is 275kV single core AWA 1Cx1000mm2, 2 runs per phase with total lenghth up to 2.04km. The cable is laid in trefoil formation up to the concrete duct bank where cables are laid in flat...
Dear All,
I have to determine the size of the lighting panel based on the total lighting fixtures connected under each circuit. My calculation is based on the data below:
Total load connected = 3kW
Lighting panel rated voltage = 400V 3Ph+N
Outgoing feeders for lightings = 230V 1Ph+n
Outgoing...
Dear Experts,
As per the subject, if an upstream IED using Modbus and downstream IED using IEC61850 communication, how to implement the intertrip/interlock function between them?
The upstream and downstream equipment are located very far from each other where hardwire connection is not...
Dear All,
We have a 400V Switchgear fed from two 33/0.4kV transformers each on bus A and bus B. Then there is emergency incomer on bus E which is fed from 11kV emergency switchgear station via a 11/0.4kV transformer. Under normal operation emergency incomer breaker is open and bus tie BE is...
Hi All,
I've seen the intertrip and interlock function is provided for transformer feeder and incomers. Is this protection required for transformers only or can be applicable for plain feeders as well?
Tripping the breaker upstream of a transformer will intertrip the downstream breaker. This...
Dear All,
I came across a circuit drawing for lighting distribution panel 3P+N (400/230V) where the Incomer is protected by a 4 pole MCCB in series with a 3 pole contactor. The system earth is TNS.
There are 3 phase and single phase loads connected under this DB. For 3 phase loads, the...
Hi Fellow Professionals,
Usually the VT ratio is given as for e.g 11kv/110V. But I've seen a different representation like 11kV/√3 / 110V/√3. Schneider's instrument transformer catalogue explains the first ratio representation is when primary voltage is connected between phases and the second...
