so today we're going to be using the Metrel
3155 in order to do the three-phase rotation at the origin of the supply
so the 3155 has upgrades from the original 3152 that we've seen before in
previous video presentations has a longer battery life it is faster
increased ip rating and also the one that i really like
you can build your own test sequencing so just think you may be carrying out
electrical installation condition report and do your sequence of tests in a
certain order again you can build it into this so the
machine will follow that order that you've predetermined
another handy little feature is here that we can just pull this down and we
can angle our 3155 when carrying out our
tests so let's set our tester up let's look at
our leads and let's look at how we're going to carry out
the three-phase rotation of the origin of the supply
of the electrical installation so let's have a look at the leads then
so grab the set of leads and i'm sure the first thing you're going to say to
yourself is hang on guys they're brown they're blue they're green
and yellow and you're going to be throwing onto a
three line supply so in other words three phase
if we look here we've got the main four pole switch isolated however the supply
underneath it is energized and we're going to carry out the test on
the top and it's really important that we put our probes on in the correct
sequence in order that we can work out the correct rotation of the phases
so we want a clockwise direction matrella have already thought about that
by labeling these probes so the brown probe here is labeled also
l1 the blue probe is labeled l2
and the green probe is labeled l3 so it helps you put the probes on in the
correct order so we're going to be using l1 on brown l2 on black and l3 on gray
and it's really important you put them on correctly in order that the machine
can tell you you're in the correct phase rotation
so let's get set up with our Metrel 3155 in order to measure
voltage when we measure the voltage we'll also do our three-phase rotation
we're gonna do a single test u there for voltage so we're going to
that one and it's already been set up to do
a three-phase voltage test but if we were in a single phase voltage
we just go into that screen there and we can just change the parameters back to
single phase of course we're doing a three-phase test
so we're there and then we've got the earthing arrangement and
also the parameters of the voltage that can change from the supply so we expect
a nominal value of 230 volts single phase and 400 volts 3
phase but we know those parameters can change by that percentage that's been
discussed previously so let's go in and do the test so we go
back there and we're going to the main screen and now we're ready all we need
to do now is insert this into the back of the
machine like so and we can now probe on it will give us our three line
voltages and it will also in this section just down here go
one two and three if we've got our phase rotation correct
again just to show you l1 l2 and l3 l1 l2 and l3 switch is currently off
i'm going to probe into position so i get them nicely secured in
while the supply is actually de-energized i'm comfortably in position
i can now turn on so i'm now live i now just need to press
the run button master question answer yes and you can now see that
we've got our voltages for each of our three lines and more
importantly there we've got the one two and three showing that we've got the
correct phase rotation so what we'll do next is swap
these leads around but not the actual cables
and let's see what happens to the phase rotation if we didn't get l1 and l2 and
l3 probed on correctly
so i'm going to repeat the process again this time making a mistake with how i
probe on my leads if i move these two round
so i've now got it so i'm going l1 l3 and l2 still probing on correctly to
the right conductors but i've made a mistake let's see what
happens the phase rotation then so we probe back in as we did before but
this time we're not in the correct sequence from the test lead point of
view hold it in position energize
then we just need to go and press the run button
we answer the question
and you can see now we've actually got three
two and one so we haven't got the one two and three we had before
that's your incorrect phase rotation but it's best to check first of all your
probes are correct before you start wondering whether the
supply cable here is incorrect or maybe a joint in the road
so a little top tip for you there just remember to make sure you get your
probes onto the correct conductors in the correct sequence because obviously
incorrect probing on can show you that you've got an
incorrect phase rotation when that isn't the case
so we looked at the three-phase rotation at the distribution board at the
incoming supply but maybe for the electrical contractor
it's more important that we actually confirm it
at things such as three-phase sockets imagine we're plugging in a three-phase
motor compressor etc the last thing we want to do is have
that rotating in the wrong direction could cause a lot of damage so how we're
going to test here well we could unscrew the front and probe into the
back very similar to the way we did it at the
mains end or we could take our original lead that we looked at we could perhaps
cut these ends off and insert an industrial plug onto the
end in order that we can plug into here
however matrell do an active three-phase switch
which has many applications and one of them it can be used
in order that we can plug into the front here with our test lead
and therefore prove the voltage and the three-phase rotation that's what we're
going to do these are connected via bluetooth very
easily and we just plug it into the back as we have before with our tester
like so and we take this lead now and again
it's fully labeled l1 l2 etc so we're just going to plug it in in the
appropriate holes in the active switch so if we get those correct so l2 goes in
l2 l1 okay l3 i'm going to put the neutral and
protective conductor in as well just to keep them out of the way and
stop and floating in front of me so they're in
like so and now we can plug the plug into our socket
and we can energize it and now we go back to our machine
so we're on the right test we're all ready to go so we've got to do is press
run what you notice is now with the three
phase is not black as it has been previously it's actually green
so it's saying it's communicating between that and the three phase
active switch so let's have a look at the phase rotation one
two and three shows our line voltages as well
so we now know that this socket outlet is actually got the correct phase
rotation therefore whatever we plug into it
will get that clockwise rotation so the active switch
can be used in other applications we'll explore in further videos
as well we're now going to simulate a fault in other words i'm going to change
some cables around in the back here and let's see if it picks it up on the
three-phase rotation so we repeat the process again at this
socket outlet here before we plug in a new machine with a motor in it
or maybe a compressor to prove that we've got the correct three-phase
rotation so we take our plug again and when we go
turn it on press our run button and we can see we've got three two and
one so therefore we haven't got the correct
phase sequence in in order that we get a clockwise
rotation of our phases so that's what an anti-clockwise so in other words the
motor would run the opposite way around so it's really important that we now
investigate that for me the first place i'm going to look is in
within the actual socket itself before taking the distribution board
cover off so as always we're interested in your feedback are you currently using
the Metrel 3152 this will also do the test that we've
looked at today we've also now introduced the new matrel the Metrel
3155 and some of the key features we're going to explore more of those in future
videos as always we'd love your comments below
we'll try and get back to as many as we
can