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Hi, Want to get some advices on HV transformer connection type. I see two different transformer connections in 2 different projects which are just nearby. One is having a YY transformer (110kV), another one has a DY transformer (66kV). I'm not sure why the design is such different given a...

Hi, Following the recent earthquake happened in Myanmar, a question comes to mind about seismic design. Thailand is not considered as a seismic region. However, the Myanmar earthquake extends to Thailand, even to Bangkok which seems to be very far away from Myanmar, causing severe damage there...

Do I need to do any fault scenario analysis of two power sources short circuit at the ATS?

When I do a fault discrimination analysis, if I have a final circuit of 32A 1ph MCB with an immediate 400A 3ph upstream MCCB, do I still need to detail check the discrimination, or, from the ratings of the upstream and downstream breakers I can already told discrimination is achieved?

Hi, I have a query regarding an installation where there is an upstream 400A MCCB supplying several 1ph 32A type D MCBs. According to the manual of the 400A MCCB, the ground fault current setting is set at 80A with 0.2s tripping time. However, at 80A, the 32A MCB downstream only trip as...