Three-Phase Passive Harmonic Filters are used to minimise harmonic distortion, especially in installations with high levels of non-linear loads such as variable frequency drives (VFDs), UPS units and rectifiers. They function by using passive components resistors, inductors and capacitors in a filter network to suppress unwanted harmonic currents and voltages.
They are typically tuned to specific harmonic orders (e.g.,3rd, 5th, 7th, 11th….), providing low-impedance paths at those frequencies to effectively divert harmonic content. The capacitive elements in these filters offer reactive power compensation, enhancing the system’s power factor.
Key specifications include:
- Operating Voltage - 415 VAC
- Operating Frequency - 50HZ
- Power Rating - 1.1KW to 250KW
- Mounting - Floor/wall
Passive harmonic filters are recognised for their simple and robust design, making them a popular and cost-effective solution for mitigating harmonics in power systems. In addition to assisting with compliance to harmonic distortion limits set by standards such as IEEE 519, the filters also help reduce overheating, mechanical stress, and vibrations in motors and transformers caused by harmonic distortion.
Applications for the EMIS TPQH3411 passive harmonic filter include:
- Variable Frequency Drives (VFDs), induction furnaces, robotics, conveyors.
- High-power pumps, blowers, motor drives
- UPS systems and switch-mode power supplies.
- Crushers, rolling mills, large motors.
- Compressors, offshore drilling systems, pumps
- Elevators, lighting with electronic ballasts
- Inverter-based wind/solar systems
- Cement, Paper, and Steel Industries
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