Printing Industries Solution
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Typical Challenges Recurrent tripping and malfunction of printing machine (city line/high line) Low power factor Increased losses due to high harmonic distortion and low power factor Interruption in operation of continuous printing machines Root Cause Analysis High level of harmonic distortion generated by AC/DC drives at city line machine identified as main reason of tripping related issues Low power factor (true) due to high harmonic distortion and use of DC drives Solution P2 Power Active Harmonic Filter at major nonlinear loads especially city line/high line (p2p-415- af3) P2 Power Hybrid Filter (p2p-415-hf3) - best suited when power factor is low Benefits Total current harmonic distortion maintained within limits specified as per IEEE standard (iTDD <8%) True power factor maintained close to unity Significant savings through elimination of failures and power factor improvement Optimum capacity utilization of transformer Reduced harmonic and reactive losses Elimination of interruption in printing process such as paper break, low printing quality etc
Harmonic Solutions
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The increasing use of modern power electronic apparatus (drives, uninterruptible power supplies, etc.) produces nonlinear current and thus loads the network with harmonics. The capacitance of the power capacitor forms a resonant circuit in conjunction with the feeding transformer. Experience shows that the self-resonant frequency of this circuit is typically between 250 and 500 Hz, i.e. in the region of the 5th and 7th harmonics. Typical loads requiring harmonic filtering include 6 pulse drives (AC / DC), 3 phase UPS, frequency converters. Harmonic Filtering Solutions Active Harmonic Filters With L&T’s active harmonic filters, reduce your THD levels to within IEEE/CEA limits. These filters are IGBT-based power converters. This filter injects negative of the harmonic current resulting in practically no harmonic distortion. Phase balancing and power factor correction is also achieved. Features :- 30-600 A Active filter in 3 phase 3 wire/4wire Stand-alone & modular units Response time less than 1 ms/li> Easy diagnosis of fault conditions with alarms Easy configuration & parameter monitoring with LCD touch screen HMI Reactors – Harmonic Filtering Detuned harmonic filters are the series combination of a reactor and power capacitor. This filter offers higher impedance for high frequency harmonics. This prevents harmonic resonance and amplification. Features :- Available as 7% (189 Hz) & 14% (133 Hz) detuned filters Copper & Aluminium wound reactors Very low operating losses - 3 to 5 W / kVAr High linearity - 1.8 times the rated current Low noise Auto-thermal cut-off
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