530kW motor checks? !!

The TigerTek motor test indeed was very impressive.

Certainly a great bit of kit they had!


Interesting though that on 120v each phase is drawing almost roughly the same current A57, B50, C49.


Stepping up to 208v it's A76, B65, C61 so again virtually the same on each phase....


At 240v however it then begins to alter ?? A86, B74, C68


At 380v it's..... A134, B121, C103


At 480v, A172, B166, and C141


All voltages are almost the same, BUT phase C's current draw seems way lower compared to A.

Does anyone possibly know why A was pulling far more current, than C?

Is that normal??

It seemed odd to me, A taking mostly the highest load current.

That would mean A is loading far more than the others which could result in a premature failure.

I thought the whole point of 3 phase was that each phase loaded equally, which thus providing a balanced power loading?

?


Also, yes - if there had been a catastrophic failure of a bearing, or a fanblade breakage...

Certainly that high inertia in the rotor, would not have been held by those straps!


I don't know how much that motor weighed, but having that stall and then fly across any workshop wouldn't be a good outcome ?



ABB have been superb, and sent over a superb PDF motor manual which gives tons of info, here are a few screenshots of stator and rotor winding checks, and also brush pressure.






It does also mention anti-condensation heaters and temperature sensors too.


Additionally it mentions oil leakage and the possible causes!



Certainly a superb manual.

Warman have also been super, and sent a PDF of their pump ?


I have no idea as to how the motors were disconnected, if the power station engineer did that or it was done by the demolition company.

Worryingly, lot 9 shows a small conduit feed intact:


Possibly a sensor line or some low voltage feed, anti-condensation or temp control maybe.


However lot 10's conduit has been sheared off......


The motor's frame bolts have also been undone.


Look closely again at these two pictures.... and both shows other cable lines cut.


It would appear that (maybe) most have been 'pruned' with no regard for the reinstallation of the machine.

If it was a feed into the actual plant then sobeit, but if just to a nearby controller box or sub-unit then the entire cable (or cables) will all have to be replaced (at extra cost), when they could have been simply disconnected carefully from one side and easily reconnected again at the new site.


Could also be a major problem if associated equipment and/or panels/boxes are removed or even lost.

It may not be possible to easily reinstall things properly!


Looking rather a mess... and it seems reading the manual the cooler unit (topbox) was delivered separately on any initial motor installation, so possibly that should come off before the motor is even lifted out.


The entire motor (as it sits on the concrete pad) wasn't designed to be craned out in one go.

Hopefully someone doesn't attempt this, or the base frame could get badly bent.....

Worse... one of the eyebolts breaks from an overload

OR the cooler is pulled apart from the motor, and the motor then drops to the ground.


The new site location for any motor purchased would yes have to have a suitable supply, but I was trying to get a motor, (or motors) just saved from any damage really.

Getting them out certainly from the demolition area..... before being wrecked beyond any use.


I do though wonder, if they haven't already been, or will be??

Doesn't look good.

The TigerTek motor test indeed was very impressive.

Certainly a great bit of kit they had!


Interesting though that on 120v each phase is drawing almost roughly the same current A57, B50, C49.


Stepping up to 208v it's A76, B65, C61 so again virtually the same on each phase....


At 240v however it then begins to alter ?? A86, B74, C68


At 380v it's..... A134, B121, C103


At 480v, A172, B166, and C141


All voltages are almost the same, BUT phase C's current draw seems way lower compared to A.

Does anyone possibly know why A was pulling far more current, than C?

Is that normal??

It seemed odd to me, A taking mostly the highest load current.

That would mean A is loading far more than the others which could result in a premature failure.

I thought the whole point of 3 phase was that each phase loaded equally, which thus providing a balanced power loading?

?


Also, yes - if there had been a catastrophic failure of a bearing, or a fanblade breakage...

Certainly that high inertia in the rotor, would not have been held by those straps!


I don't know how much that motor weighed, but having that stall and then fly across any workshop wouldn't be a good outcome ?



ABB have been superb, and sent over a superb PDF motor manual which gives tons of info, here are a few screenshots of stator and rotor winding checks, and also brush pressure.






It does also mention anti-condensation heaters and temperature sensors too.


Additionally it mentions oil leakage and the possible causes!



Certainly a superb manual.

Warman have also been super, and sent a PDF of their pump ?


I have no idea as to how the motors were disconnected, if the power station engineer did that or it was done by the demolition company.

Worryingly, lot 9 shows a small conduit feed intact:


Possibly a sensor line or some low voltage feed, anti-condensation or temp control maybe.


However lot 10's conduit has been sheared off......


The motor's frame bolts have also been undone.


Look closely again at these two pictures.... and both shows other cable lines cut.


It would appear that (maybe) most have been 'pruned' with no regard for the reinstallation of the machine.

If it was a feed into the actual plant then sobeit, but if just to a nearby controller box or sub-unit then the entire cable (or cables) will all have to be replaced (at extra cost), when they could have been simply disconnected carefully from one side and easily reconnected again at the new site.


Could also be a major problem if associated equipment and/or panels/boxes are removed or even lost.

It may not be possible to easily reinstall things properly!


Looking rather a mess... and it seems reading the manual the cooler unit (topbox) was delivered separately on any initial motor installation, so possibly that should come off before the motor is even lifted out.


The entire motor (as it sits on the concrete pad) wasn't designed to be craned out in one go.

Hopefully someone doesn't attempt this, or the base frame could get badly bent.....

Worse... one of the eyebolts breaks from an overload

OR the cooler is pulled apart from the motor, and the motor then drops to the ground.


The new site location for any motor purchased would yes have to have a suitable supply, but I was trying to get a motor, (or motors) just saved from any damage really.

Getting them out certainly from the demolition area..... before being wrecked beyond any use.


I do though wonder, if they haven't already been, or will be??

Doesn't look good.