Improve electric power quality and reduce energy losses due to Harmonics. Detailed studies were carried out and
the effects of poor power quality specially harmonics were analyzed on the productivity and energy consumption.
Harmonic current generated by nonlinear loads like motors driven by Variable Frequency Drives (VFD) cause
power system heating and add to user power bills. The harmonic related losses are present in the power cables,
bus bars linking the loads with source, the power transformer itself. A more serious effect of harmonic loads
served by transformer is due to an increase in winding eddy current losses. The heat generated due to harmonics
must be removed in order to save electrical energy, thus leading to savings in the utility bill.
Acase study where a 2.0 MVAtransformer used for powering the plant. The current harmonics is recorded with &
without using the Active harmonic filter (AHF). The power parameters are recorded on side of transformer to
demonstrate how the active harmonic filter can reduce the effects of harmonics and save energy.
Amtech Electronic provided Active Harmonic Filter Solution and Energy Saving in various Industries, as you can also see in the below given application case study.
Previous System :
- Plant was running with so many non linear loads like VFDs, UPS, Computers etc...
- No any Harmonic Mitigation solution installed in plant.
- Current Harmonics (THD-I) was observed around 24 - 25% at TR-4 incomer, which is much higher than the limit of 8.00% as per IEEE 519 – 1992 standards.
- Voltage Harmonics (THD-V) was observed around 2.2 – 2.5% at TR-4 incomer, which is well within the limit of 5.00% as per IEEE 519 – 1992 standards.
- PF Capacitors are not magnifying the Harmonics as they are detuned with 7.0 % series reactor.
Problems Observed :
- Capacitor over heating and failures.
- Cable heating which lead to insulation breakdown.
- Transformer heating, equipments heating, motor heating.
- Random fuse blowing, relay tripping, breaker tripping.
- Limits on generator & UPS capacity
Present System :
Previous System (Without AHF) :
Current Harmonics (THD-I) : 24 – 25 % and Voltage Harmonics (THD-V) : 7 – 8 %
Present System (With AHF) :
Current Harmonics (THD-I) : 2.0 – 2.5 % and Voltage Harmonics (THD-V) : 1.5 – 2.0 %
- Capacitor over heating and failures avoided.
- Random Fuse blowing, relay tripping, breaker tripping avoided.
- Transformer heating, equipment heating, cable heating avoided.
- Contactor burnt out avoided.
Other benefits (Savings) include :
- Reduced energy usage (kWH) and reduction in demand (kVA).
- Reactive power (kVAR) and Apparent power (kVA) saving.
- Improved PF and voltage quality.
- Reduction in I2R losses in conductor.
- Reduction in equipments losses (motors, transformers etc..)
- Electrical equipment life and performance increased.
- Protection of sensitive electronic equipments
- Operating cost reduction.
- Reduced maintenance, decrease consumption of spare parts.
- Better capacity utilization of transformers and generators.
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