Based on the EHS inspection of the harmonic filter installation at the new construction site, the primary goal is to ensure high-quality power and system stability by mitigating voltage distortion caused by non-linear loads (like VFDs, LED lighting, and UPS systems).

Based on the EHS inspection of the harmonic filter installation at the new construction site, the primary goal is to ensure high-quality power and system stability by mitigating voltage distortion caused by non-linear loads (like VFDs, LED lighting, and UPS systems).

Here is a brief summary of the parts and working principles: 

Key Components of a Harmonic Filter

1. Inductor/Reactor (Coil): Stores energy in a magnetic field; blocks high-frequency harmonic currents while allowing the 50/60 Hz fundamental power to pass.
2. Capacitor Bank: Stores energy in an electric field; provides low-impedance paths to trap harmonic currents and provides reactive power compensation (power factor correction).
3. Resistor: Used in passive filters to dissipate harmonic energy as heat, providing damping and preventing resonance.
4. Semiconductor Switches (IGBTs) (for Active Filters): Rapidly switches to inject precise, opposite currents to cancel out harmonics in real-time.
5. Controller/DSP Board: Monitors the power system in real-time to detect distortion and controls the filter's response.

5-Point Summary: How It Works

1. Harmonic Detection: The filter continuously monitors the electrical line to identify unwanted harmonic currents (usually 3rd, 5th, 7th multiples of 50/60Hz).
2. Low-Impedance Path Creation: The filter provides a very low resistance path at specific tuned frequencies, attracting and diverting harmonic currents away from sensitive equipment.
3. Cancellation Technique (Active Type): For active filters, the unit injects an equal and opposite phase (180° shifted) current onto the line, canceling out the distortion.
4. Reactive Power Correction: The filter acts as a capacitor bank at base frequencies, boosting power factor near to unity, which reduces electricity bills and increases efficiency.
5. Waveform Purification: By removing the higher-order frequency ripples, it restores the power supply to a smooth, clean 50/60 Hz sine wave.

EHS Focus Area: Verify proper grounding of capacitors, check reactor temperatures, and ensure ventilation is sufficient for heat dissipation.