IEEE519-2014 Standards Voltage Harmonics and Current Harmonics
Bus voltage Vz at PCC |
Individual harmonic (%) |
Total harmonic distortion THD (%) |
V ≤ 1.0 kV |
5.0 |
8.0 |
1 kV < V ≤ 69 kV |
3.0 |
5.0 |
69 kV < V ≤ 161 kV |
1.5 |
2.5 |
161 kV < V |
1.0 |
1.5 |
ISC/IL |
Individual harmonic limits (Odd harmonics) a,b |
TDD Required |
||||
3 ≤ h < 11 |
11 ≤ h < 17 |
17 ≤ h < 23 |
23 ≤ h < 35 |
35 ≤ h ≤ 50 |
||
<20c |
4.0 |
2.0d |
1.5 |
0.6 |
0.3 |
5.0 |
20<50 |
7.0 |
3.5 |
2.5 |
1.0 |
0.5 |
8.0 |
50<100 |
10.0 |
4.5 |
4.0 |
1.5 |
0.7 |
12.0 |
100<1000 |
12.0 |
5.5 |
5.0 |
2.0 |
1.0 |
15.0 |
>1000 |
15.0 |
7.0 |
6.0 |
2.5 |
1.4 |
20.0 |
Main Forms of Power Quality
Power quality (PQ) related issues are of most concern nowadays. The widespread use of electronic equipment, such as information technology equipment, power electronics such as adjustable speed drives (VSD), programmable logic controllers (PLC), energy-efficient lighting, led to a complete change of electric loads nature. These loads are simultaneously the major causes and the major victims of power quality problems. Due to their non-linearity, all these loads cause disturbances in the voltage waveform.
Electrical equipment is occasionally exposed to transient overvoltages (surges/spikes), swells, flickers, unregulated voltages, voltage dips/sags, interruptions or waveform disturbances (power factor, harmonics, others).
YT Power Quality Solutions
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