MV switchgear configuration

[rzgpp]

Hi everybody!
I am thinking about MV customer distribution substations....like a rule in my region MV switchgear is configured from left to right:input feeder/output feeder and after that transformer feeder.Last years manifacturers produce stations in witch first is transformer feeder..from left to right..and next in/out.Is here any technical reasons?Any thoughts?

 

[jraef]

There is no standard orientation that I am aware of, they build whatever the buyer asks for. If nobody asks, the default is generally left to right starting with the incomer, just because that is how most cultures read text. But if the gear is designed by someone where text goes the other way, they might orient it that way, again IF nobody specifies what they want.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

 

[bacon4life]

Double ended switchgear in my region has incomers at each end and all out outputs in the middle. Single ended gear is numbered either way depending on the specification.

 

[rzgpp]

Thanks for replyes!

 

[che12345]

Dear Mr. rzgpp

1. " I am thinking about MV customer distribution substations....like a rule in my region MV switchgear is configured from left to right:input feeder/output feeder and after that transformer feeder."
I am of the opinion that it depends on the (specification) which is most likely based on their existing orientation/practice of the plant, in order not to cause confusion to the operators.
2. In the case of [LV], where the (current and busbar size are of much larger values), the [busbar material cost] and the [heat loss i2R] should be taken into consideration.
e.g.1 It is NOT unusual to place the 6000A incoming cubicle at the middle and outgoings spread out 3000A about equally between left and right. In some cases, the busbar is tapered towards the ends. Busbar size is smaller and therefore lower the cost.
Attention: Some specification may prohibits this arrangement.
2. 6000A incoming is located at the extreme left or right, with full 6000A busbar throughout, irrespective of whether left or right. Higher busbar cost.
Che Kuan Yau (Singapore)