Posted: 2022-05-23 03:03 AM
i want to ask about how to read and describe this data
i want to want to draw phasor diagram from this data
how to read it and how to describe it into phasor diagram ?
Hello @Arsyad_Azhari ,
You can think of this number as the angle between Voltage and current. Lets assume Va at 0 Vb 120 and Vc 240, then current A could be at 89 degrees, Current B, 321 degrees, current C, 197 degrees.
This is just an example.
first question :
this angle number is positive so it is counterclockwise isn't it ? or else ?
second question :
current B = 321 degrees, is it counted from Va (0 degrees) or from Vb ?
and also for currrent C = 197 degrees, is it from Va (0 degrees) or from Vc ?
We can create the phasor diagram if we have the voltage angles V1 to V2 and V2 to V3 and V3 to V1 or we can calculate the angles under assumption of 120 degrees each. like V1=0, V2=120 and V3=240.
Yes, the phase angle number is positive and counterclockwise.
The angle V2- A2 = 201 degrees, is it counted from V2 (120 degrees) and current V3-A3 = 317 degrees, is it counted from V3 (240 degrees).
Can you check the physical connection of I2 and I3 CT inputs? It seems to be interchanged.