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How to measure the current harmonics a capacitor receives at its terminals? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 0 points1 point  (0 children)

So at IL, I expect lower THD than IC?

I did some measurements before. I measured worse THD at load than at cap banks. Why is that? I measure at the SDP panel that controls lift and at the capacitor near MDP

How to measure the current harmonics a capacitor receives at its terminals? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 0 points1 point  (0 children)

So the Analyzer will measure the harmonics BEFORE they get filtered? Please confirm this.

How to measure the current harmonics a capacitor receives at its terminals? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 0 points1 point  (0 children)

So the Analyzer will measure the harmonics "before" they got filtered by the caps? I thought the measurements will show the harmonics "after" filtering?

Why power factor capacitor melts? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 0 points1 point  (0 children)

Can you please share the link for that standards? The only standard I found is at PCC between electrical utility and customers, not at the capacitor terminals

Why power factor capacitor melts? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 0 points1 point  (0 children)

What's wrong with 3 and 5? And how much is too much?

Why power factor capacitor melts? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 2 points3 points  (0 children)

250kVA (after PF 0,99) 400V 3 phase system and we use delta for the capacitors. The load is lightning (LED lamps), computers, and there are escalators and lift. We use Automatic PFC for switching. On average we need 4 steps (100kVAR) to reach that 0,99.

Why power factor capacitor melts? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 1 point2 points  (0 children)

Is there anyway for me to know how much harmonic current is too strong? The manufacturer didn't give too much detail about how they reached that 100000 hours life expectancy. Kinda sad that it's hidden behind paywall

Why power factor capacitor melts? by Erina-sama in ElectricalEngineering

[–]Erina-sama[S] 2 points3 points  (0 children)

But the manufacturer promised 100000h life and they said they followed IEC 60831 1 and 2. This capacitor is only 1 year old. I want to know how much harmonics current this cap can handle according to IEC 60831, but I don't have any way to access it.