Calculating System Capacitive

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ZCBee

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What are the steps of calculating the System Capacitive Charging Current? What formulas are used? What system measurements must be taken? What system measurements can be extrapolated from other know values? What variables are involved?
 
zog said:
What is the context of your question? I could interpret it several different ways.
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Yes, I see. Last week I listened to EC&M's HRG (High Resistance Grounding) webinar and am currently reading their article on Arc Mitigation, so my curiosity is peaked.

Our plant has three 600A 14.4KV Switch Gear feeds feeding 10 substations. The ten substations, all 480V 3 phase "Y" then feed our plant's loads. I know curiosity killed the cat but I would like to understand this aspect of determining the capacitive charging current in this application.

BTW, we are solidly grounded so this is purely educational in motive as I doubt they would justify the expense in today's economy.

I have seen the effect of the capacitance in our system when we place safety grounds on the switch gear for maintenance purposes. I understand where the capacitance comes from in the conductors but how do you determine you systems charging capacitance?

In what other ways can my question be interpreted?

Thanks
Charley
 
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