Comprehensive Power Quality Improvement Solution
Media and Communications Industry: Oriental Pearl TV Tower
Case Introduction:High harmonics and excessive neutral current eliminate potential risks.
On-site Test Results:The main sources of harmonics are landscape lights and LED advertising screens, which have large current fluctuations and rapid changes. The concentrated loads generate 3Nth harmonic currents, and the neutral current is very large.
Test location: LED load main input terminal
|
Voltage trend chart |
|
Current trend chart (blue represents neutral wire current) |
|
Harmonic current trend chart (blue represents the third harmonic current in the neutral line) |
|
Harmonic current distribution chart |
|
|
|
|
Power and power factor |
Voltage & current waveform |
|
|
|
|
Voltage and voltage distortion rate |
Current and current distortion rate |
|
|
|
|
Phase A current distortion list |
Phase B current distortion list |
|
|
|
|
Phase C current distortion list |
Phase N current distortion list |
Solution:Based on the actual site conditions and measurement data, we recommend using our PQC power quality comprehensive treatment device, which can simultaneously address power quality issues such as harmonics, three-phase imbalance, and reactive power. We will install it in the original location according to the existing cabinet space dimensions.
Photos Of The Mitigation Equipment Installation:
Comparison Of Mitigation Data:
|
|
|
|
Before mitigation: The three-phase current waveforms were distorted. |
After mitigation: The three-phase current waveform tends to be sinusoidal. |
|
|
|
|
Before mitigation: Phase A 3rd harmonic current content: 30.41A Phase A 5th harmonic current content: 19.70A Phase A 7th harmonic current content: 9.22A Phase A 9th harmonic current content: 2.07A Phase A 11th harmonic current content: 5.75A
|
After mitigation: Phase A 3rd harmonic current content 5.52A Phase A 5th harmonic current content 3.28A Phase A 7th harmonic current content 2.44A Phase A 9th harmonic current content 1.08A Phase A 11th harmonic current content 2.03A
|
|
|
|
|
Before mitigation: N-phase fundamental current: 12.17A N-phase 3rd harmonic current: 93.01A N-phase 5th harmonic current: 3.07A N-phase 9th harmonic current: 8.07A
|
After mitigation: N-phase fundamental current content 11.08A N-phase 3rd harmonic current content 16.16A N-phase 5th harmonic current content 1.62A N-phase 9th harmonic current content 3.52A
|
Mitigation Result:Harmonics generated by landscape lighting and LEDs have been mitigated, and current in the neutral wire has been eliminated.