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ADE7880 VTHD and ITHD readings when the power supply is coming from Genset

Question asked by engineerat6e on Feb 13, 2018
Latest reply on Feb 21, 2018 by engineerat6e

Hello,

We are using ADE7880 in our energy meter design (3-Phase 4-Wire system, 63A/0.276V CT connected to each phase) and Fluke435 as reference meter. 

Line Frequency : 50Hz

Our meter readings match with fluke when the power supply is coming from grid. But when the power supply is coming from Genset, the THD readings are very high as compared to fluke. Also,  the Fundamental component of current read from the register FIRMS is around 5amps lesser than the value shown by the reference meter.

Register Settings:-

VLEVEL = 0x38000

COMPMODE = 0x1FF(default)

 

Testing Results on Genset :

R_Voltage    Y_Voltage    B_Voltage    R_Current    Y_Current    B_Current
239.984       242.459       245.435          23.861       17.009          15.642
239.938       242.372       245.394          23.95          16.985         15.553
239.934       242.333       245.367          23.875        16.929         15.463
240.018       242.45         245.49            24.009        17.01           15.585
239.891       242.263       245.289          23.82          16.87           15.358

 

R_THD_VR_THD_IY_THD_VY_THD_IB_THD_VB_THD_IR_Harmonics_1R_Harmonics_3R_Harmonics_5R_Harmonics_7R_Harmonics_9R_Harmonics_11R_Harmonics_13R_Harmonics_15Y_Harmonics_1Y_Harmonics_3Y_Harmonics_5Y_Harmonics_7Y_Harmonics_9Y_Harmonics_11Y_Harmonics_13Y_Harmonics_15B_Harmonics_1B_Harmonics_3B_Harmonics_5B_Harmonics_7B_Harmonics_9B_Harmonics_11B_Harmonics_13B_Harmonics_15
86.13192.58784.71892.2284.87687.64918.5520.6690.1190.0910.850.3770.2220.95513.4210.8140.8840.6050.6180.6540.7020.62813.0770.7470.1870.6380.7930.1930.5740.795
91.99799.89390.77398.86293.60496.62216.9790.5510.1240.1760.7160.4070.3430.92312.150.931.1430.8370.8471.121.0310.69211.2620.3750.4560.9960.3090.2630.8720.314
95.6103.33895.857103.56495.74999.61516.580.5730.1080.2840.7520.3040.4350.88311.8910.7840.6940.6820.7470.4510.7550.87810.9140.9220.210.7430.820.2160.6720.706
95.895103.81296.268103.98496.918101.6816.5840.5240.0610.2040.7150.3790.3320.95411.9511.0441.160.7630.9580.9480.8350.7910.8310.4430.1450.70.3690.0950.7020.328
94.114101.75594.606102.34195.82999.85316.7420.5670.0740.0810.7480.2940.2620.86812.0420.6490.8130.6960.4170.6580.7990.46910.8570.5810.0850.7660.5990.0980.7160.627

[R_THD_V is Total Harmonic Distortion of the R-Phase Voltage in percentage]

[R_THD_I is Total Harmonic Distortion of the R-Phase Current in percentage]

[R_Harmonics_1 is fundamental component of R-Phase rms current in Amps]

[R_Harmonics_3 is 3rd harmonic component of R-Phase rms current in Amps]

 

Please help me resolve this issue.

 

Thanks and Regards,

Ratnesh

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