【20150816】How to understand the correspondence between high-voltage metering cabinets and low-voltage cabinets
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I hope everyone will participate actively; 2 points for participation and 10 points for thorough analysis.
First is the high-voltage incoming cabinet--PT/CT metering cabinet--high-voltage outgoing cabinet--transformer--low-voltage incoming cabinet--low-voltage outgoing cabinet. In some cases, there is no high-voltage incoming cabinet; instead, power enters directly from the high-voltage busbar to the high-voltage outgoing cabinet.
It is recommended that everyone conduct digital analysis from the perspective of current.
In simple terms, when the output of a transformer or generator is at a high voltage (as high voltage is required for long-distance transmission), high/mid-voltage switchgear is needed to control protection and distribute electrical power； However, industrial and residential electricity is mostly low-voltage; high and medium voltage electricity needs to be converted to low voltage through transformers, after which it is controlled, protected, and distributed by low-voltage cabinets. Their relationship can be understood as a combination of uses: they have different roles, but are equally important.
Could you analyze it from 35 KV at the power generation stage all the way down to 220 V at the low-voltage level for the users?