phase rotation testers

[Silly Sausage]

yeah ive checked pm. we usually connect
l1 to u
l2 to v
l3 to w

but because we dont usually run a supply to our panels we don't know if the rotation will be correct

the direction it spins depends on the phase angle if i remember what my tutor was telling me, (poles usually 120o apart if 3 poles)

Eh?

What happens if you swap L2 & L3 say?

 

[shanky887614]

Eh?

What happens if you swap L2 & L3 say?

if reverses direction

it gets pushed/pulled by the poles.

if you swaped them then it would be affected by l3 before l2 so spin in the opersit direction.

 

[davesparks]

There you go then, direction of the motor depends on the phase rotation, not the phase angle

 

[ipf]

yeah ive checked pm. we usually connect
l1 to u
l2 to v
l3 to w

but because we dont usually run a supply to our panels we don't know if the rotation will be correct

the direction it spins depends on the phase rotation if i remember what my tutor was telling me, (poles usually 120o apart if 3 poles)

:edit

phase rotation not angle as i was quite rightly picked up on.

getting my terminology mixed up lol

What if it's 4 pole ?:laugh3:

 

[ipf]

So once you’ve checked rotation how are you going connect the motor?

40 years of dealing with motors and I’ve never used a rotation indicator.

Same here....more money making unnecessaries, IMO.

 

[shanky887614]

What if it's 4 pole ?:laugh3:

wouldnt come across one here mate, 3phase off vsd or built in vsd

 

[davesparks]

I thought poles always came in pairs in motors?

 

[shanky887614]

I thought poles always came in pairs in motors?

nah we have 6 pole motors

 

[davesparks]

Maths not your strong point then shanky?

6 poles is 3 pairs of poles!

 

[Knobhead]

The sensible method is spin the motor before the coupling is fitted.

Get the rotation wrong on some pumps and compressors your going to be changing the unit.

 

[Silly Sausage]

I thought poles always came in pairs in motors?

Have you been hanging around Dover ferry port?

 

[shanky887614]

Same here....more money making unnecessaries, IMO.

yeah jtl have a long list they want you to do.

if i miss anything ive got to do it in the training centre as a last resorts

 

[davesparks]

What is MICV?

 

[ipf]

wouldnt come across one here mate, 3phase off vsd or built in vsd

Hope you don't need any knowledge about them in the future, then.

 

[shanky887614]

What is MICV?

polymeroc sheith oror something acordong to iee

 

[davesparks]

That makes no sense, MICC is mineral insulated copper cable, so how can MICV be anything to do with a polymeric sheath?

 

[Knobhead]

Due to a hangover from the days of us having our own power station all the 11KV boards were BYR. We used 550V on the plants with the same rotation.

Then two new plants were build which were using this weird 433V. Some genius decided the rotation should be RYB. They were separate from the older plants so it didn’t matter.

Then it came to major alterations to one of the old plants. It was to retain 550V for some parts, 433 for the new stuff. Me being the resident idiot got lumbered with the job. First question, which rotation? Because it was overlapping with old stuff we went for BYR.

Again not really a problem as they were separate entities or so we thought. The plants spread out as they tend to and started to overlap. I got saddled with rebuilding a switchroom with 550V BYR, 433V RYB and 433V BYR. I was going dizzy! To add to the confusion the two 433V feeds could be interconnected.

 

[CockneyReject]

Don't envy you mate, borrow a fluke T100 off someone and get the unit/task signed off no point spending coin on something that sounds like will never be used again by yourself

oh and take a little time to brush up on your motor theory too

 

[CockneyReject]

Due to a hangover from the days of us having our own power station all the 11KV boards were BYR. We used 550V on the plants with the same rotation.

Then two new plants were build which were using this weird 433V. Some genius decided the rotation should be RYB. They were separate from the older plants so it didn’t matter.

Then it came to major alterations to one of the old plants. It was to retain 550V for some parts, 433 for the new stuff. Me being the resident idiot got lumbered with the job. First question, which rotation? Because it was overlapping with old stuff we went for BYR.

Again not really a problem as they were separate entities or so we thought. The plants spread out as they tend to and started to overlap. I got saddled with rebuilding a switchroom with 550V BYR, 433V RYB and 433V BYR. I was going dizzy! To add to the confusion the two 433V feeds could be interconnected.

Sounds like fun Tony, any oh **** moments or did it all turn on ok?

 

[shanky887614]

Don't envy you mate, borrow a fluke T100 off someone and get the unit/task signed off no point spending coin on something that sounds like will never be used again by yourself

oh and take a little time to brush up on your motor theory too

yeah i know i need to brush up, havent used some of the knowledge since i got my level3 cert back in 2012.