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OK I was referring a book and found I could use one wattmeter method to find Kvar
kAVR=V(L)I(L)sinΦ
Now the problem is only when I know Φ will I know the kVar then I can compute wattage too
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Dear Members,
I am trying to understand how I could calculate the wattage of a 3Φ ac supply by means of using two voltage and one current transducer.I have seen this in one device which uses it to calculate power factor (pf= W/VA)
I have seen many circuits using 3Φ voltage lines and 3Φ current...
Dear Members,
I want to know what is this "Sliding Window " how it works ?, which the meter manufactures claims make their meter more accurate ?
http://www.eleconmeasurements.com/solutions/demand_monitor_controller1.php
Thank you
Isolation seems to be a must but I a puzzled how to get it.
There is one +12/24VDC supply
12VDC
->>> Relay (interfaced to outside world)
->>>Opto LED side ( Inputs from external sources)
5VDC
->>> Microcontroller (here is the complication)
->>> Opto LED Transistor side
The micro is...
Dear Members,
I am trying to develop a battery operated device which works on Automobile battery (12V/24VDC) , so the input range is around 9-36VAC.
I need to derive two isolated supplies 5VDC@500mA and 12VDC@1A.I have seen circuits using UC3483 for such circuits.
I need help in deciding the...
ADE7758
Dear Members,
I am working on an automation to design a data logger & controller for a electrically controlled furnace
It requires me to measure the Amps , Voltage & kWh ,and planning to use a ade7758 for the same.
I am able to get the amps , volts and the kwh but what registers I need...
The device runs on 24VDC which is supplied externally to many instruments in the system.
Since my project is a module I have to put all of it in a box of maximum din size 144x144mm
Thank you for the speedy reply,will the led current transfer constant for the device life or will it need frequent calibration?
I am trying to use LM331 V/F converter to get frequency proportional to voltage, but it is not working yet , any ideas please ?
Deepak
I need to measure AC supply voltage from two different sources , the condition is that I can't mix the Neutrals of these sources
I Can't use an isolation transformer since they are bulky, I am thinking of an optoisolator based solution which can give me pulse width proportional to voltage , Is...
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