Passive Harmonic Filter System
Most of the mentioned filtering techniques have the common drawback of the higher cost compared to Passive Filtering techniques. Consequently, the harmonic filtering techniques, to a large extent, are still the most commonly used techniques for current harmonics mitigation of 6-pulse front-end diode rectifier applications. We have developed an efficient Passive Harmonic Filter, which can suit many such similar loads. Since all filter components are passive, they are rugged, maintenance-free, reliable and low cost. Moreover, the filter implementation procedure is relatively easy.
With a simple structure, our Passive Harmonic Filter has been extensively used for VFD harmonic mitigation. No involvement in electronic circuits, hardware, and complicated control algorithms. Hence, our Passive Harmonic Filters are relatively inexpensive means for eliminating current harmonics distortion and improving the system power factor. Because of these two in one improvement, our broadband filters usually have the edge over the other effective filtering methods.
Benefits of using NECPL Passive Harmonic Filter
Improved Efficiency: By reducing harmonic distortion, our filters enhance the overall efficiency of your electrical system. You’ll see significant energy savings and reduced operating costs.
Enhanced Equipment Lifespan: Prolong the life of your valuable equipment and protect it from potential damage caused by harmonics.
Compliance: Stay in compliance with industry standards and regulations for power quality. Our filters ensure your facility operates within acceptable limits.
Environmental Impact: Minimize your carbon footprint. Reduced energy consumption translates to a greener, more sustainable operation.
Reliability: Enjoy uninterrupted operations. Our Passive Harmonic Filters provide stability, reducing the risk of costly downtime.
Versatility: Suitable for a wide range of applications, from manufacturing plants to data centers, our filters adapt to your needs.
Available in The Following Configurations:
- Panel mounted Passive Filter enclosed in a cabinet with IP- 20 Protection.
- Frame-mounted Passive Filter with IP-00 Protection which can easily fit in the VFD Panel.
- Filter available with other IP ratings on request.
Features and Advantages
- Helps meet IEEE-519 requirements
- Guarantees THD-I performance of 8% Max at 50% load, 5% Max at full load
- Meets the voltage and current distortion limits of IEEE-519
- Saves energy by eliminating the wasted energy associated with harmonics, therefore reducing the true RMS KVA demanded from your power source.
- Suitable for speed controllers or inverters
- Reduces energy costs
- Increases equipment reliability by absorbing transients and voltage surges
- Increases equipment life by reducing the heat associated with harmonic currents
- Improves power factor
- Reduces THD-V to meet power quality standards
- Uses fewer capacitors while maintaining 98% efficiency.
- More consistent power factor across the load range.
- Improves the C/L ratio, which decreases potential resonance.
- Lowers capacitance, resulting in less voltage rise at no load, at PCC (Point of Common Coupling) and on the DC Bus.
Applications
- AC or DC Motor Drives
- Protection of VFD
- Industries with a high density of VFD Load
- HVAC System
- Water Treatment Facilities
- Fans and Pumps
- Elevators
- IEEE 519 Compliance
Harmonic Reduction at Mains Incoming (PPC)
Actual THD-I reduction on mains shall depend on total coverage of harmonic generating loads in network installed with the filter. Using the filter in isolation on some harmonic generating load shall lead to a lesser reduction in THD-I Moreover, to get optimum result THD-V at point of connection should be <2% and voltage unbalance should be <1%.
Performance of Passive Filter
Reading on 75 KW Filter connected to 75 KW VFD THD-I on various Loading of VFD (Voltage THD Was 2.8% for the following readings)
Specifications of Broad Band Passive Harmonic Filter
| Technology | Passive Broad Resonant |
| Type of Filter | 3 Phase 3 Wire |
| Output Load Type | 6 Pulse variable rectified |
| Supply Voltage | 415VAC +/- 10%, 3 Phase |
| Frequency | 50Hz +/- 1% |
| Input voltage | unbalance 1% Max |
| Max. Source | impedance 6% |
| Min. Source | impedance 1.5 % |
| Duty | continuous |
| Operating ambient temperature | -20°C to +50°C |
| Overload | 150% for the 1-minute duration with
10% output voltage reduction of nominal voltage |
| Total current harmonic distortion@ THD-V <3% | <9% at 30% loading |
| <8% at 50-60% loading | |
| <8% at 60-90% loading | |
| <5% at 90-100% loading | |
| Protection | IP 20 Enclosure Siemens grey 7035 Color |
