Discussion in "New Ideas regarding projects" started by    SANATH MCX    Oct 1, 2008.
Wed Oct 01 2008, 11:29 AM
Hi to all,

I want to design the Power Theft Detector. Can anybody help me on this.

Regards
Sanath
Pune
Fri Oct 03 2008, 05:19 AM
I think using TDR which is known as Time Domain Reflectometry we can detect the power theft and also locate the position of power theft. But the problem is how to design the TDR System.
Fri Oct 03 2008, 07:28 PM
i have no idea about TDR
Sat Oct 04 2008, 10:03 AM
Thanx Ajay for the Reply :-) :-) :-)

Ok ..... First let me tell about the TDR. it is very simple

( Time domain Reflectometry) is a widely used technique to find the fault occurrence in cable. and the instrument is called as Time Domain Reflectometer or Cable Radar or Echo Meter.In this
1. Sending a well defined voltage pulse down to the Testing line and waiting for the echo. 2. Displaying the sending pulse and echo on Fast oscilloscope screen
3. Analyzing the characteristics of Echo such as Shape of the waveform, Direction, Impedance, Magnitude of the pulse.
4. Measuring the Echo time to find the cable length or distance to fault.

and following are the parameters included this
1. Rise Time of the Pulse
2. Pulse width
3. The amplitude of the Pulse
4. Impedance over the cable
5. PVF ( Velocity of Pulse)

I hope the above details have given clear idea about the TDR

[lightbox=image_url|title|group|float]http://rapidshare.com/files/150797434/01_Outstanding_TDRs.pdf[/lightbox]

Now my problem is How we can design the TDR System and How we can make use of this TDR Technique in Embedded system for the Power Theft Detection and Location Over the Transformer Lines which I feel one of the great challenging tasks in the Present scenorio.

Can anyone help me on this.

Regards
Sanath
Pune

Email: [email protected]

Mon Oct 06 2008, 12:08 PM
Hi to all,

I think I need to put the end for the TDR ( Time Domain Reflectometry)

let me have one more idea for this
we know DTMF ( Dual Tone Multi-frequency ) which can be sent over the electric power lines for the communication i.e switching of device ( which is called as Device switching via DTMF) by making use of of DTMF Encoder and DTMF decoder like HT9170.
So can we make of the above technique with some other modifications for the power theft detection. please help me on this.

Regards
Sanath
Pune

Email: [email protected]
Mon Oct 06 2008, 08:02 PM

Hi to all,

I think I need to put the end for the TDR ( Time Domain Reflectometry)

let me have one more idea for this
we know DTMF ( Dual Tone Multi-frequency ) which can be sent over the electric power lines for the communication i.e switching of device ( which is called as Device switching via DTMF) by making use of of DTMF Encoder and DTMF decoder like HT9170.
So can we make of the above technique with some other modifications for the power theft detection. please help me on this.

SANATH EMBEDDED

I think TDR *is* the way to go, but it seems you are the expert around here
Any method that works is likely to specialised and complex, I think you will just have to
invest in some expensive test gear and good books,
sorry

Tue Oct 07 2008, 05:55 AM

While going through the TDR concepts I got stuck in below condition.

For the TDR to work the Cable should be Metallic and atleast two conductors insulated from each other.

Sanath
Pune

Email: [email protected]
Tue Oct 07 2008, 06:13 AM
I think it just means metallic conductors.. ie copper.
You need at least two conductors to look for unusual
interactions between them.

[ Edited Tue Oct 07 2008, 06:15 AM ]
Tue Oct 07 2008, 07:22 AM
Hi Experiment UK,

Ok .... Let me take the example of Electric transformer power lines.
it has got two lines ( Metallic conductors) one is Phase and another one is Neutral.
which are insulated from each other. Is it right or not....

Regards
Sanath
Pune

Email: [email protected]
Tue Oct 07 2008, 07:35 AM

Hi Experiment UK,

Ok .... Let me take the example of Electric transformer power lines.
it has got two lines ( Metallic conductors) one is Phase and another one is Neutral.
which are insulated from each other. Is it right or not....

Regards
Sanath
Pune

Email: [email protected]

SANATH EMBEDDED

Yes that would be correct, as long as the two lines are together in a cable,
and not six feet apart on big pot insulators

I think working with high power systems may make a difficult job
even harder, and rather dangerous.

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