High voltage AC measurement (upto 1000v)

[enemra]

Dear all,

I am looking for a circuit that could measure AC voltages upto 1000V. The input will be AC voltage that varies from 0-1000V. The output from circuit should be 0-100V. i.e, For actual 0V, the circuit should give o/p of 0V and for 1000V, the o/p should be 100V. i.e, in the form of desired ratio.

Please let me know if anyone knows any solution.

 

[Kripton2035]

a so called "voltage divider" ...

Voltage divider - Wikipedia, the free encyclopedia

 

[BradtheRad]

A resistor divider is the usual method.

You'll need power resistors. Rated for a watt or two. That's what it would be if you use, say a megohm in the upper branch of the network across 1000V.

Now the question becomes, what load resistance is your measuring device?

A typical multimeter might be a megohm. Then it will pull the tapped voltage down by about half.

However your measuring device might have a very high impedance. Then you'll have an easier time. You could even use 10M ohms in your resistor network. They could have a lower watt rating. Less expense that way.

Another way to drop AC down in voltage is to use a capacitive divider. Similar to what's used to power an LED from house AC. It might be tricky to adjust for accuracy however. And it can be fatal to your meter if the capacitor were to short out.

 

[poorchava]

If there's a transformer in your circuit you may just add another winding with appropriate number of turns and measure voltage across it

 

[enemra]

Issue solved with my own circuit. Thanks.

 

[sahu]

a so called "voltage divider" ...

Voltage divider - Wikipedia, the free encyclopedia

it is only for DC voltage measurement
but AC measurement =?

 

[poorchava]

why only for DC? Voltage divider works the same with AC and DC