Question asked by rajani.sureja@slscorp.com on Aug 19, 2017
Latest reply on Aug 30, 2017 by rajani.sureja@slscorp.com

Hello,

I have two questions:

1]

VTHD represents total harmonic distortion (2,3....N) in phase voltage.

HXVHD represents harmonic distortion of particular order(from 2,3,....N) of voltage with respect to fundamental.

So my question is if I add all order(2,3...N) of HXVHD values gives me same as VTHD value?

2]

Testing results for harmonics @110V on induction motor load:

1. Voltage Harmonic Analysis:

PhaseA_RMS_Voltage:1215268 109.403381V

below is the harmonic values up to 63

1213675 186 2232 18 798 51 330 31 108 13 188 37 88 7 202 32 81 5 110 26 192 30 49 7 94 36 29 21 32 28 49 36 6 8 12 44 53 25 35 21 9 9 7 20 48 18 28 7 59 18 129 31 35 1 29 51 96 18 118 43 87 36 126

2. Current Harmonic Analysis:

PhaseA_RMS_Current:1082273, 1.015865A

below is the harmonic values up to 63

1078708 568 12676 614 57297 613 16063 290 5323 72 695 55 980 44 308 15 354 15 298 5 825 60 184 5 452 52 969 15 298 19 129 26 24 22 30 26 35 31 41 12 37 34 26 34 31 45 15 32 64 7 17 12 40 7 20 40 17 34 14 34 32 24 47

3. Active Power Harmonic Analysis:

PhaseA_ActivePower:0xabfe 44030 32 W

below is the harmonic values up to 63

175510 0 2 -1 -18 -1 2 -1 0 -1 -1 0 -1 -1 0 -1 -1 0 -1 0 -1 -1 0 -1 -1 0 0 -1 -1 -1 -1 -1 0 0 0 -1 0 -1 0 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 0 -1 -1 -1 0 0 -1 -1 0 -1 0

So my question is why fundamental (means first order - highlighted in RED) value is not nearer with the actual (highlighted in BLACK) value in case of active power only?

Please replay ASAP on above queries, if you require more data pls tell me I can provide .

Regards,

Rajani