डिट्यून किए गए हार्मोनिक फ़िल्टर पैनल

About डिट्यून किए गए हार्मोनिक फ़िल्टर पैनल

Detuned Harmonic Filter Panel

It is a type of reactive power quality equipment used in electrical systems to improve power factor while preventing the amplification of harmonics. It's particularly important in industrial environments where non-linear loads (like VFDs, PLCs, welding machines, etc.) generate harmonic currents.

A Detuned Harmonic Filter Panel is an advanced type of Automatic Power Factor Correction (APFC) panel that incorporates series reactors (chokes) in combination with capacitor banks. The addition of reactors prevents resonance with the power system and suppresses harmonic amplification.

1. Power Factor Correction: Like a standard APFC panel, it improves power factor by injecting reactive power using capacitor banks.

2. Harmonic Mitigation: Reactors (usually 6% or 7% detuned) are connected in series with capacitors to detune the circuit from the dominant harmonic frequency (usually the 5th).

3. Avoids Resonance: By tuning the LC circuit to a frequency below the 5th harmonic (typically around 189210 Hz for 50 Hz systems), it prevents harmonic resonance and protects both the capacitors and the overall network.

Typical Components:

• Power Capacitor Banks

• Series Reactors (6% or 7% impedance)

• Thyristor or Contactor-based Switching

• APFC Relay (Controller)

• MCBs/MCCBs/Contactors

• Current Transformers (CTs)

• Cooling Fans & Filters

• Enclosure (Wall-mounted or Floor-standing, IP42IP55)

Benefits:

• Improves power factor without increasing harmonic distortion.

• Avoids overloading or premature failure of capacitors.

• Enhances system stability and longevity.

• Reduces electricity penalties due to low power factor.

• Helps maintain compliance with standards like IEEE 519 or IEC 61000-3-4.

Applications:

Used across industries where harmonic-producing loads exist, like:

• Automotive & Forging Units

• Cement & Steel Plants

• Textile & Paper Industries

• HVAC Systems

• Commercial Buildings with large UPS or elevator loads

Selection Guidelines:

• Perform harmonic analysis or THD measurement.

• Choose capacitor and reactor ratings based on system voltage and harmonic levels.

• Opt for 6% or 7% detuning based on dominant harmonics.

Example Panel Rating (for a 415V LT System):