capacitor blows in generator
capacitor blows in generator
(OP)
I have a 6kva generator that blows the capacitor after a few weeks after it is changed. When the capacitor is changed, the out put is perfect 240volts 50hz and power output is normal. After a fews weeks running for a couple of hours every otherday it stops supplying output. When checking I find the capacitor open ciruit.Value of capacitor is 8mmf. 450volts. This has happened about 5 times now. Can any one please give me the reason why this same problem keeps occuring?
A friend also experiences the same problem with a single phase capacitor run motor. It blows a 40mmf capacitor every time.
A friend also experiences the same problem with a single phase capacitor run motor. It blows a 40mmf capacitor every time.





RE: capacitor blows in generator
High temperatures
High ripple currents > High temperatures
Over voltage > punctures the innards.
Measure the cap's temperature with a non contact temp gun.
You can put an ammeter in one cap lead and measure the AC current for excessive ripple.
You can measure the voltage across the the capacitor to see that it's less than 80% of the cap's rating.
Other thoughts:
You could be experiencing excess ripple because of blown diodes.
You could have lost the first cap due to age (they have a finite life) then started faithfully replacing it with the wrong one.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: capacitor blows in generator
A capacitor meant for starting duty will probably fail on continuous duty.
On the motor, don't use a starting cap. to replace a run cap.
respectfully
RE: capacitor blows in generator
RE: capacitor blows in generator
One of the best,(for the money), is a Raytek MT4. I have one - I use it constantly. (You can even exercise tropical fish with it. LOL)
You can use it for almost anything.
It is the only way to measure the temperature of a cap as a probe would give a wrong result.
The link below shows it. Personally I don't like Amazon's service but find one anywhere you like!
http:
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: capacitor blows in generator
RE: capacitor blows in generator
respectfully
RE: capacitor blows in generator