Hello,
I’m quite new to the topic of energy monitoring and read most of the openenergymonitor sites to get a general understand (but I’m far away from knowing enough, I fear). I built my openenergymonitor with an arduino uno, ethernet shield, 9V ACD, emonTX shield and 3x SCT-013-000. We’ve a 3 phase power supply in germany by 230V.
The ADC is on the same phase as CT1, both are on phase 2. CT2 is on phase 3, CT3 is on phase 1. Hope this is correct, as the wave shift than is in the correct order but doesn’t start at 0 degree. As ADC and CT1 is on the same phase, this doesn’t matter, correct?
I use the sketch emonTxV3_4_3Phase_Voltage.ino, where CT4 is disabled. As explained in the code, I used this values
#undef CT4LINE 1
double Vcal = 228.7; // Calibration constant for voltage input
double Ical1 = 60.6; // Calibration constant for current transformer 1
double Ical2 = 60.6; // Calibration constant for current transformer 2
double Ical3 = 60.6; // Calibration constant for current transformer 3
double Ical4 = 16.6; // Calibration constant for current transformer 4
#define PHASE2 7 // Number of samples delay for L2
#define PHASE3 17 // Number of samples delay for L3
// Calibration coefficients common to all versions - see comments above
double Phasecal1 = 1.0; // Calibration constant for phase shift L1
double Phasecal2 = 0.22; // Calibration constant for phase shift L2
double Phasecal3 = 0.4; // Calibration constant for phase shift L3
double Phasecal4 = 1.10; // Calibration constant for phase shift CT 4
But unfortunately, I get negative real power on phase 3. Can please anybody help me, I fear the setup might be wrong.
Voltage: 225.68
Phase 1: 1.07 A, 89.44 W, 242.21 VA, PF=0.369
Phase 2: 0.79 A, 92.37 W, 179.01 VA, PF=0.516
Phase 3: 0.99 A, -85.72 W, 222.96 VA, PF=-0.384
Voltage: 225.44
Phase 1: 0.97 A, 88.78 W, 218.38 VA, PF=0.407
Phase 2: 0.66 A, 92.50 W, 148.63 VA, PF=0.622
Phase 3: 0.88 A, -89.11 W, 197.39 VA, PF=-0.451
Voltage: 225.43
Phase 1: 0.97 A, 87.60 W, 218.18 VA, PF=0.402
Phase 2: 0.70 A, 91.28 W, 157.46 VA, PF=0.580
Phase 3: 0.83 A, -82.99 W, 187.97 VA, PF=-0.442
Voltage: 225.79
Phase 1: 0.99 A, 95.39 W, 223.67 VA, PF=0.426
Phase 2: 0.65 A, 85.06 W, 147.75 VA, PF=0.576
Phase 3: 0.81 A, -76.25 W, 183.33 VA, PF=-0.416
Voltage: 225.69
Phase 1: 0.99 A, 95.15 W, 223.54 VA, PF=0.426
Phase 2: 0.68 A, 93.31 W, 153.58 VA, PF=0.608
Phase 3: 0.81 A, -82.57 W, 181.89 VA, PF=-0.454
Do you need some further information?
Thanks in advance for your assistance.
Regards,
Michael