Abstract
I am developing a "irrigation pump" energy analyzer. Irrigation pumps are controlled with Wye-Delta controller (in my country, soft starters are not used common). In these controllers system have X/5 current transformers for measuring current (energy meter or ampermetre) for reason of high current (more than 100A).
- X/5 CT is the blue component in the picture.
- Schematic is also below.
To measure all electrical parameters I use MAX78630 energy measurement IC. With these IC I use voltage dividers for measuring the AC voltage. And also use second CT for measuring current. MAX78630 Schematics. I also use second CT for modulating X/5 current transformer output to MAX78630 CST1005.
Question:
I want to change current sensing inputs for more accrue measurements. 2 way to do these.
1- Shunt resistor. 2- Current Measure IC.
- May I use these type of shunt with my design ?.
- May I use these type of measurement IC with my design ?.
- Which one is the best way.
Technical Abstract
- System have 2 CT
- First CT is (as shown on image) X/5 0.5 class current transformer. Seconder current is 5 A. Primer current is more than 100A.
- Second CT is (given by link CST1005) for modulating 5A to max78630.
- I need more than 0.5 Class accuracy.
