A question that has puzzled me for a long time; seeking help
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What is the purpose of adding a capacitor (FWF-6-1.2-3 0.4μF) to the PT cabinet? Can I omit it?
It should be used to suppress overvoltage.
Eliminate spike voltages to reduce interference.
I’m not sure about this question either; please help out
It mainly serves a filtering function to suppress common-mode interference.
It is essential to use capacitors; without them, it will have a significant impact on switches that are directly connected to the busbars, such as those for incoming power lines and bus couplers. The voltage on the busbars fluctuates greatly, which not only affects the quality of power supply but can also damage electrical equipment in severe cases. Its function is to prevent overvoltages, including lightning overvoltages and switching overvoltages.
It seems to be to prevent overvoltage; the second filtering method is more likely to be the one used