What is the voltage rating of the fans used for circulating water in petrochemical plants, and what power rating should motors generally have?
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What is the voltage rating of the fans used for circulating water in petrochemical plants, and what power rating should motors generally have?
Use high-voltage motors everywhere; we use 10KV, 220KW models here
What are the advantages of choosing a high-voltage motor? Will the motor be smaller? ? ? ? ?
With higher power levels, high-voltage systems become necessary. Some companies require the use of high-voltage systems for capacities above 200 kW, while others set thresholds at 250, 300, and similar values. The most obvious advantage is that the cables can be thinner, which reduces both the material cost and the installation cost of the cables. But the initial investment in the motor itself is definitely higher.
If a high-voltage motor is used, does that mean an starter or something similar is needed? ? ?
Those that meet the requirements can be started directly; it mainly depends on the voltage drop. Of course, having soft starting and similar features would be better, but it just means more investment~
This sea friend, let me explain! For the selection of the power and voltage rating of the circulating cooling water fans, please refer to Clause 4.4.2 of the \"SHT 3038-2017 Power Design Code for Petrochemical Plants\"; details are shown in the figure below! By using a voltage level of 10KV or 6KV, there is no need for soft-start equipment; the actual operating current (at 10KV) is around ten amps, while during startup the current is seven to eight times the rated value! When low-voltage 380V motors are used, soft-start equipment is generally required, and the requirements for transformers are also quite strict; it is necessary to conduct design calculations to determine whether they meet the starting requirements!
Additionally, the power selection for fans is determined by the fan supplier based on the cooling capacity required of the cooling water; in our petrochemical industry, common models used include those with powers of 185KW, 200KW, 220KW, and so on!