On the determination of the supply voltage level
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To build a new chemical plant, it will have 10 units in total, including hydrogenation, coking, atmospheric and vacuum distillation, tank farms, sulfur recovery, and others. Should I go to the 35KV main substation? Was this section designed by the power supply authority? Should we directly connect the 10KV incoming line? Or should we use the voltage level of the line that is available in the vicinity? The location is quite remote. . . At what load capacity is it necessary to use 35KV or 110KV power supply?
Regarding the power supply capacity of distribution lines, the industrial and civil design manuals specify the following: for 10 KV overhead lines, it is 0.2~2 MW; for cables, it is 5 MW. For 35 KV cables, the capacity is 15 MW, while for overhead lines, it is 2~8 MW
After determining the total power consumption of your factory, then decide on the voltage level to use. If there are many 10KV electrical devices and their capacity is relatively large, it is better to use 35KV. As for the design process, this is handled either by the power supply company or by a design institute in some cases. Additionally, in the case of secondary loads, dual power supply is required, with power drawn from different substations.
“To build a new chemical plant, it will have 10 units in total, including hydrogenation, coking, atmospheric and vacuum distillation, tank farms, sulfur recovery, and others. ” With so many devices, it seems to be a pretty large scale! It needs to have a load that’s at least tens of thousands of times higher! It is recommended to use a dual-circuit 110kV power supply as a minimum.