Hi, I am Mike Craig.
I am the R&D Manager for Keysight's IntegraVision family of power analyzers.
Today I am going to talk about using our wiring manager to configure both delta and wye 3-phase
measurements with our instrument.
To start off, I am just going to go right over here and hit our wiring hard key.
What you are going to see is this is going to bring up our wiring diagram.
As you can see, in the default state of the instrument each of the four input power channels
on the PA2203A are set up to be for individual measurements.
They are completely separate; they are not grouped together.
To start out to group them, I am just going to go right down here to the channel selection
key.
We're going to start off with a 3-wire, 3-meter, 3-phase configuration that you typically use
for measuring in a delta configuration.
What we can see is two things happened immediately here when I turned this group on – which
is called group A. First, the options for channels 2 and 3 are grayed out because channels
1, 2, and 3 have been grouped together.
The other thing is we notice this wiring diagram now has been completely updated to reflect
the delta wiring configuration I've chosen.
The key thing to notice here is that the actual connections of the instrument are along the
bottom of the screen so I have channels 1, 2, 3, and 4 on the rear panel of the instrument.
Basically, the diagram is showing how I connect up to my voltage and how do I connect up to
the current inputs.
One thing we can see is if we actually change the state of the current input from the internal
shunt path to the external transducer input we can see the wiring diagram automatically
updates to reflect that.
That is the 3-meter delta mode.
I am going to quickly highlight here; I am going to switch to the 2-meter 3-wire mode.
What is crucial about this particular configuration is it can allow the user to access applications
where you typically think that you need a 5- or a 6-channel power analyzer because you
can do the 3-phase measurement with 2 meters.
For example, I have channels 1 and 2 set up for that 3-phase 2-meter measurement.
I can go over here and configure channels 3 and 4, again for a 3-phase, 3-wire, 2-meter
measurement.
In that way – for certain systems – I can actually characterize a three-phase-in/three-phase-out
system.
Another example would be a solar inverter with dual maximum power point tracking where
I can configure channels 1 and 2 as DC inputs and then have channels 3 and 4 grouped together
for a 3-phase, 2-meter measurement.
The last configuration here that I am going to show is the wye measurements, or the 4-wire/3-meter
configuration.
We can see, again, the diagram is updated; it is now set up for wye.
Basically, again, you can look at the diagram as you make your connections to the instrument
and proceed from there.
I am just going to adjust the shutter here on the back of the instrument.
Again, we have channels 1, 2, and 3 groups.
I am going to go ahead and close the wiring diagram.
I have some simulated data up here on the screen, and what we're actually looking at
is the input to a 3-phase rectifier right now.
One really nice feature, when I have my channels grouped together, is the autoscale function.
It typically behaves sort of like how you would think any Keysight scope would behave
when you hit autoscale, except when you have a group channel we have this extra autoscale
option here which you can select from the soft menu down here by going to arrange traces
by group.
It will run another autoscale, and now what it has done is it has sort of grouped the
voltage and the current traces from that group together.
The other important thing is it has also changed the vertical scaling on all 3 channels in
that group to be the same, which allows you to easily identify is there any kind of mis-wiring
or is there any kind of asymmetry on my three phases here.
You can easily see that just by inspection because they've all been scaled to the same
range.
We will take a quick look here now that I've got these group measurements.
In the power quality analysis mode I can now – if I go to my source selection here – chose
group A, which is again channels 1, 2, and 3.
I see over here on my power quality panel I've got a new set of measurements reflecting
that group.
I can see the individual voltage and current measurements of each phase, and I can also
see average measurements for the group.
Similarly, with real power and apparent power, I can see the powers of the individual phases
as well as the real power of the group, apparent power, and then finally the group reactive
power here at the bottom.
Then of course we have power factor measurement and average power factor measurement here
at the bottom as well as voltage and current frequency measurements which, because of the
nature of the rectifier I'm looking at, you can see the current frequency is actually
measured to be twice that of the input voltage.
Just to quickly highlight how group measurements are used in some other modes, you can see
they also apply in the energy mode.
I can select that group as a source.
We can also look at efficiency where – I think this is probably one of the most powerful
uses of group channels; I can both as an input and an output, if I wanted to – I can select
my group channels.
Finally, another very important feature would again be our phasor diagram feature where,
again, I choose the source.
I go to group A, it brings it up.
We can see.
We sort of have the 3 phases.
The currents are in pretty close alignment here, but again, all I have to do is select
that group measurement and my phasor diagram is ready to go.
In summary, we saw how to use the writing diagram to set up both delta and wye group
measurements, and then some of the analysis features that we can easily use once we have
those group measurements set up.
Thanks a lot.