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Power Quality Mike Thornton National Sales Manager
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Poor Power Quality: What is it TO YOU? Any event related to the electrical network that makes you lose money… - Power supply failures E.g. Breakers tripping, fuses blowing - Equipment failure, malfunctioning and lifetime reduction E.g. - Equipment overheating (transformers, motors, …) - Damage to sensitive equipment (PCs, UPS-systems, Drives) - Capacitor problems - Electronic communication interference - System losses - Utility regulations G5/4 and penalties - Personnel issues (illness, work efficiency, …)
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors A load which draws a non-sinusoidal (distorted) current, when a pure sinusoidal voltage is applied, is a non-linear load Where do harmonics come from? ‘Sinusoidal’ supply voltage Non-linear load All non-linear loads create harmonics Harmonics = the distorted waveform – the 50Hz/60Hz part in the waveform
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Non-linear loads are everywhere and in ever increasing number! Industrial loads (mainly 3-wire systems) AC and DC drives, UPS-systems, … => Harmonics between phases, imbalance, sometimes reactive power Commercial loads (mainly 4-wire systems) All office equipment such as computers, fluorescent lighting, photo copiers, fax-machines, … =>Harmonics in neutral and between phases, imbalance, sometimes reactive power are connected between line & neutral generating 3rd harmonic in the neutral conductor Some loads are unbalanced Where to find non-linear loads?
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors The best solution to harmonic problems Active harmonic filters Filtering principle: cancellation of harmonics by equal and opposite harmonic generation by an active filter device LOAD CURRENT ACTIVE FILTER CURRENT CLEAN FEEDER CURRENT Waveforms + = Harmonics
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Cable car application Problem: - Utility uses ripple control signals at 1050 Hz and 1600 Hz - High frequency components present on the public network
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Cable car application Initial line current without ABB active filter Solution: ABB active filter
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Cable car application Current [Arms] Filtered line current with ABB active filter Solution: ABB active filter
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Neutral protection overload Protection Ith (L): 100A RMS N: 65-80% * Ith MVLV PQFT L1 (R) L2 (Y) L3 (B) N NL Loads: - Fluor. light - PCs -... NL Loads: - Fluor. light - PCs -... NL Loads: - Fluor. light - PCs -...
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Neutral protection overload H3 in neutral with and without filter Without filter: - I H3 150 A RMS With filter: - I H3 0 A RMS Time [10 ms/div] I [100 A/div] Without filter With filter
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors THE solution to poor power quality ABB premium class Active Filters: PQFKPQFM PQFI
©ABB Power Technology Front End Sales BA PTPH - LV Capacitors Power Quality Solutions Power Factor Correction Passive Harmonic Filters Active Harmonic Filters Flicker – Dynamic Compensation
A global leader in power and automation technologies that enable utility and industry customers to improve their performance while lowering environmental impact
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