I am designing a product for motor protection circuit. where I want to use customized external CT for application which gives me better accuracy in current reading
Below list are power ranges of motor and their measuring current range. Based on current range I would like to choose my external CT
My questions are, as per CT image attached
How is burden VA calculated?
How to calculate burden resistor if I want to interface with PIC16F886?
How CT size can be reduced? What parameter do I need to change to make as per size 2 to meet accuracy requirements?
If I select this CT, what will be max current I can supply above without it going to saturation?
What is effect on burden VA if the current exceeds 100A?
How to calculate r1, r2, r3 for this circuit?
Considering AC1030 data sheet. AC1030 datasheet Ip=30A I max=75A turns ratio: 1000:1 supply voltage = 220VAC min power continuous CT can sense = 220X30 = 6.6 kW Max power sense for short period=220*75=16.5 kW Irms=1.4*30A=42A
burden resistor= 2.5/(42/1000)=59.5ohm R1=R2=100kohm resistor.
Is it correct? What are other care I need to consider while taking hardware design?
In this type application we need to use normal CT or protection class CT 5p10/5p20 series? How burden VA calculated? How can I judge max voltage limit giving to Arduino Board?