- #1
EEstudent90
Hi again, got a few questions (marked with numbers) for passive filters used to filter harmonic currents in the power system.
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- Look at my one-line diagram below. Let's say I have a passive filter connected in shunt with respect to the load and the passive filter "diverts" the harmonic currents it is tuned for (let's say 5th harmonic) to ground. If my non-linear load is not connected to ground, would the passive filter work? We do not have any closed path for the harmonics to circulate in (if we neglect the capacitance between the load and earth), so I don't see how it could work. But I could use a delta connected passive filter, to provide the closed loop right? (Question 3 is somewhat related to this aswell).
- The main idea of a shunt passive filter is to provide a low impedance path for the tuned harmonic, so if the current has to flow through ground as shown in my picture below, this would be a relatively high impedance path right? Would we have to install a conductor to reduce this impedance?
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3. I have seen that you can connect the passive filters in either wye or delta. If I chose a delta connected passive filter, and I would want to provide a closed low impedance path for the third harmonic this would not work right? As the third harmonic is a so called zero sequence current, and the delta connection would look like a dead end, i.e. not a closed loop.
So if I wanted to compensate the third harmonics using a passive filter, I would need a similar setup as shown in my paint drawing above?Sorry if my post is a bit messy, I tried my best. Thanks for any help.
Best regards
So if I wanted to compensate the third harmonics using a passive filter, I would need a similar setup as shown in my paint drawing above?Sorry if my post is a bit messy, I tried my best. Thanks for any help.
Best regards