digital 3 phase volt meter
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project topics
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Joined: Mar 2010
20-01-2011, 11:00 AM

This project and implimentation is to make high efficient digital three phase volt meter , with following specification using micro controller

Accuracy (+ or -) 0.25% F.S. (+ or -) 1 digit
Sampling Time Abt. 0.8 sec. typically
Aux. power source AC 110/220V (+ or -) 10%m 50/60Hz
Power Consumption <AC 3 VA
Operating Temp. range 0-60 deg. C
Storage Temp. range -10 -70 deg. C
Temperature coefficient <100PPM/deg. C
Max. relative humidity 95%
Dielectric strength (IEC688)
AC 2KV/1Min
Input/power/output terminals
AC 3KV/1min
All terminals to case
Impulse (IEC 255-4) Common mode 1.2 x 50 micro-sec
Display 14.2mm (0.56") H red LED
i suggest you people need to read
circuitstodayac-voltmeters and elec-toolboxusefulinfo/xfmr-3ph.htm
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Active In SP

Posts: 1
Joined: Jan 2011
20-01-2011, 11:21 PM

i want this project and implimentation please send me it's all information

summer project pal
Active In SP

Posts: 308
Joined: Jan 2011
01-02-2011, 12:06 AM

In electronic ac voltme­ters input signal is firstly rectified and then sup­plied to the dc amplifier. In some circuits, the block diagram includes the attenuator, the rectifier and the multi-stage DC amplifier. and finally the output is shown in the PMMC meter. Sometimes, the block diagram will be attenuator->multistage amplifier, rectifier and PMMC meter.

AC voltmeters are divided into:
Average Reading AC Voltmeters.
They are average responding type and indicates the average value of the voltage on the dial. This method is effective and works satisfactorily and is less expensive beccause most of the systems involves the sinusoidal waveform. But in the case of the non-sinusoidal waveform voltage, the high or low waveform is given depending on the form factor of the waveform.


Use a 220 to 6 V transformer which is then rectified and filtered to give the 6V dc . To adjust the voltage, a voltage divider circuit is used. Then give it to ADC to use the microcontroller to read the voltage and display in the LCD.

8051project and implimentationsforum-t31555.html

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