Pure SINEWAVE Output from D/G !!

Check the AVR of generator,Problem will be generated If the AVR is not working

properly.

there is no AVR section !!

What do you mean by "No AVR section" ?

AVR = Automatic Voltage Regulator. It can be an electronic module or an electromagnetic device of some kind like a compound transformer + rectifier etc. You need it to keep the voltage constant when loading.

If it is a small electronic module, then it might have some knobs for adjusting ...

Your 500VA unit is small. If the AVR is not with any adjusting pots, then maybe you can reduce the flickering by speed increasing.(?)

The Thimble Drome of gensets!

What is your load?

load maximum 250 to 300 Watt. there is no inductive load.

Dear Mr.RAMAKANTHA,

You have not mentioned the Number of Cylnders in the system. Any Diesel Generator set while running at Rated Speed will generate only SINE WAVE and NO DOUBT ABOUT the Generation of Sine Wave. FLICKERING of Light will be due to the following Reasons.

1. On Electrical Front: a) EARTHING in the POWER DISTRIBUTION may not be proper. b) The Neutral may be loose or connection may nay not be perfect. c) The Fuse/Links in the system may have problem. d) Defective AVR of the Generator - or too SLUGGISH RESPONSE by the AVR, for varying Voltage.

2. On the Engine Side: a) Fuel Injection may not be proper. b) Governor will be TOO SENSITIVE. c) Power developed in each cylinder may vary - due to defective/leaky Piston Rings.

Pl. check and inform what was the problem.

Thanks,

DHAYANANDHAN.S

this problem occurs from New, when i was in primary school nearly 1994

DG - Only one cylinder

and this DG is single phase .

that not a constant moment of inertia

Unless the parts in the engine are changing shape, their moments of inertia will be constant.

For incandescent (and most other) lighting purposes, the output of small, standard generators is close enough to pure sine wave. Inverter generators synthesize a sine wave, so the quality of the electronics affects the shape of the wave. Your best bet might be to look at the output on an oscilloscope. You might find that a vibrating loose connection (such as the connection at the plug) is causing your flicker.

It is possible, but unlikely, that your light power supply (if an LED or CFL) is unusually sensitive to frequency. Some versions of this generator have a frequency meter, and you could experiment with lower or higher frequency to see if that helps. Also try the same bulb on mains power to make sure that it is not just the bulb.

Check the AVR:

If there is a setting potentiometer labelled 'GAIN' or 'Sensitivity', reduce it a little by rotating rhe knob until the flickering stops. (if it increases, go the other way).

If you connect a multimeter to the output terminals when the generator is running it will show you the frequency and voltage before loading and after loading.

that will also give you an idea of voltage regulation.

if frequency is low adjust governor.

if you get a big voltage drop between open voltage and reading you get when you load the generator, replace AVR.

Check for loose wire connections and cable runs from DG and load