T
T.M.Haja Sahib
Guest
Yes.
Engine
Make:Escorts Ltd
Model:G30
RPM:1500
Power:43bhp
Sl.no:E3122904
Alternator
Make:Crompton Greaves
Frame:GIR 160 MA
Power:30KVA
M/C No:ICAG6790
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Engine
Make:Escorts Ltd
Model:G30
RPM:1500
Power:43bhp
Sl.no:E3122904
Alternator
Make:Crompton Greaves
Frame:GIR 160 MA
Power:30KVA
M/C No:ICAG6790
T
T.M.Haja Sahib
Guest
It is more than 3HZ drop.Our specification limits it to 1.5 HZ.
Not ascertained.If so,What is the implication?
Not checked.Will do it.Thanks.
T
T.M.Haja Sahib
Guest
I do not know.How to check this?
It was a brand new gen set meant for future additional load for a telephone exchange
How to check it?
Presently the exchange is with a 15KVA gen set.
Would there be other symptoms that suggest these tests are necessary?
The generator tech that was there did not take any readings of the sort.He got calibrated the fuel injection pump and refitted the same but no result.
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Well, 43bhp is 32kW at the motor output shaft/generator input shaft. Assuming the engine is producing its rated output.
It isn't overly generous, but unless it's extraordinarily inefficient, that 32kW generator input should be capable of providing 30kVA at 0.8 pf.
It points to a problem with with the engine.
Is the generator power factor definitely 0.8? It isn't given in the data you provided.
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mivey
Senior Member
Have you tested the variable load to see if it is good up to the desired loading point (stays balanced, etc.)?
mivey
Senior Member
Looking on Compton's website, it appears to be the way they label so it should be 30 kVA @ 0.8pf
T
T.M.Haja Sahib
Guest
Yes.The engine speed stays relatively unchanged only up to a resistive load of 30A in each phase.
mivey
Senior Member
Brushless AC Generators - Voltage Regulation: +/- 1%
3 phase, 415V or 380V, 50Hz, 4 pole, 1500 rpm, 0.8pf (lag)
kVA: 30.0
G2R/G1R Frame: 160MA
FL %Efficiency: 86.0
3/4 FL %Efficiency: 87.0
Degree Of Protection: IP 21
Duty Rating: Continuous (S1)
Short Circuit Withstand Capability: 3 times FLC for 10 seconds
Harmonic Distortion Factor at NL L-L: < 2.5%
Max. Unbalanced Load: 25%
TVD at FL 0.8pf: 15-20%
TVR at FL 0.8pf: 20-25%
Automatic Voltage Regulator (AVR)
? Under speed protection with LED indicator.
? Over excitation protection with LED indicator.
? Designed for thyristor load without additional filter circuits.
? Moulded construction for protection against shocks, vibrations and adverse atmospheric conditions.
Under-speed Protection (with AVR)
Protects both the AC Generator and v/f sensitive loads. The AVR has provision for setting the frequency below which voltage dropping occurs linear to speed. This feature also enables the prime mover to recover the speed faster during motor starting.
Wave Form
AC Generators are designed to give an excellent output wave-form. The total harmonic content of line-to-line voltage wave-form on no load is less than 5% as per the limits specified by IEC/IS standards.
Overloads
AC Generators are capable of delivering an overload of 10% for one hour after every six hours of running.
Motor Starting Duty
Each kVA of AC Generator is capable of starting 1 HP of Induction Motor on direct on line starting.
Transient Voltage Dip
Sudden application of full load at 0.8pf (lag) results in 15-20% dip in terminal voltage
Operating In Different Environments
? For use of AC Generator at altitude higher than 1000 m above sea level, it is necessary to derate by a factor of 4% for every 500 m above 1000 m.
? If the ambient temperature exceeds 40 deg. C, the derating factor to be incorporated is 4% for every 5 deg. C increase.
Standards Compliance
? IEC: 34
? BS: 5000 (Part 99)
? EN 50081
? IS: 4722 & 13364 (Part I & II)
With CE mark for brushless designs.
mivey
Senior Member
I notice you changed the filters and the tech checked the fuel injection but I would still suspect the engine. Fuel-starved? Compression issue?
- Location
- Massachusetts
I sure would like to see a fuel pressure check under full load.
T. M.,
Is there any chance this installation is at a higher than normal altitude?
T
T.M.Haja Sahib
Guest
Any simple ways to check?Thanks.
T
T.M.Haja Sahib
Guest
No.No deration for altitude is required.Thanks.
mivey
Senior Member
With a fuel pressure gauge and a compression gauge. The gen tech should have them.
What is the rated output voltage of the generator?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
one would think that a competent tech would have already checked all the very obvious things we have mentioned, yet it is not clear that this happened. it may be that the tech in question is more of a genset salesman than a tech.
T
T.M.Haja Sahib
Guest
415V.With it,it is only developing 22kW and not full load 24kW.Moreover,the specs demand overload capacity of 10% for one hour.So the gen set should be capable of supplying 26.40 kW for at least one hour.But it does not.Another identical gen set under identical conditions(lying idle for almost two years) installed in a different telephone exchange passed the test.But this one does not.
K8MHZ
Senior Member
- Occupation
- Electrician
If you can see the throttle linkage, watch to see if the linkage is moving all the way, thus opening the throttle all the way as you lose power. If it is, you likely have an engine problem, if it's not, you likely have a controller problem.
So it may have been bad from the factory.
A compression check should indicate the condition of the rings. Visual inspection for any rubber seals. Doing compression checks on Diesels is a bit more difficult than on an engine with spark plugs. The values are much higher, too.
Not taking any readings prior to parts replacement is a good indication of a person that does not know what they are doing.
- Location
- Massachusetts
It sure happens and is exactly why most of our job specs require load bank testing after installation on site before acceptance.
I'm a bit of a petrol head, just an interested amateur but I have both. I agree that the technician should have them.
You might.
I have a car with a Diesel engine and there are no visible moving parts connected to the accelerator pedal.
I agree. Wonder if TM got a written report by the technician of what he did (and didn't) do.
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