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Hall effect sensors for measuring AC line voltages upto 300V

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manishanand14

manishanand14

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Hello Everyone!

I need to measure AC voltage. Can I use a hall effect sensor for that?

I have few Winson WCS2702,WCS2705 for measuring DC current upto 2 Amps and 5 AMps respectively.

Please suggest me a part no. of a hall effect sensor whose output voltage varies linearly with input AC voltage [upto 300V]. I need to measure 3 phase line voltages.
 

manishanand14 said:
Hello Everyone!

I need to measure AC voltage. Can I use a hall effect sensor for that?

I have few Winson WCS2702,WCS2705 for measuring DC current upto 2 Amps and 5 AMps respectively.

Please suggest me a part no. of a hall effect sensor whose output voltage varies linearly with input AC voltage [upto 300V]. I need to measure 3 phase line voltages.
Click to expand...

NO! Hall sensors respond to CURRENT, not voltage.
You need a voltmeter to measure voltage. If you need to transfer the AC voltage to a system, you should use an isolation transformer.
As a voltmeter you can find a DVM (digital voltammeter) with an optical output by which you can transfer its digital output to your PC.
 
Hall sensors are used in professional voltage transducers, e.g. in traction applications (electric locomotives). The transducers are comprised of a series resistor and a hall sensor with a large number of primary turns. This way you get an isolated AC/DC voltage transducer that doesn't need a primary supply. The sensors are quite bulky and expensive, see e.g. www.lem.com.

For pure AC voltage measurements, isolation transformers are the industry standard solution, as suggested. If isolation isn't needed, or a certain leakage current can be accepted, single ended or differential voltage dividers achieve excellent performance.
 
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