“We have obtained quality power with reduced down time and energy savings through cancellation of harmonics using ABB PQF Active Filters.” - Accenture

AccenturePower quality and energy efficiency

Fact File / Consulting and Outsourcing

Boost in power quality-

Significant reduction in Total Harmonic Distortion (THD) - upto 95%

High THD is a common problem in offices with high IT establishments as the operation of computers, UPS etc leads to increased harmonics in the system. This causes excessive heating of devises and network components, nuisance tripping of circuit breakers, blown fuses etc.

Improved energy efficiency-

Improved power factor – up to 0.99. Up to 20% reduction of kVA consumption by the UPS

Poor power factor causes increased losses in feeding transformer and cables as well as attracts cash penalties from power utilities.

Other benefits of improved power factor includes provision for connecting additional loads, elimination of over heating and nuisance tripping of uninterrupted power supply (UPS) thereby increasing equipment life.

Reduced equipment down time

A reduction of 30-40% in neutral to ground voltage has been demonstrated. High THD voltage will induce neutral to ground voltage much beyond the 1 volt limitation. A high neutral to ground voltages will interfere in the operation of servers which are organized in clusters.

Accenture is a global management consulting, technology services and outsourcing company. High power quality and energy efficiency is critical to its operations.

Accenture commissioned an external agency to conduct a power quality audit due to tripping problems at the output of the UPS which supplies large server clusters in Chennai and Hyderabad. The 24X7 availability of the servers is critical to Accenture business.

The major findings of the study were disturbances in the power supply due to high levels of neutral ground voltage, voltage harmonic distortion, current harmonics, neutral current, etc.

ABB solution and customer benefits

ABB installed its PQF Active Filters – 7 nos. at Accenture Chennai Centre and 4 nos. at its Hyderabad Centre to protect sensitive equipment due to heavy harmonics and trippings.

Supply current with PQF OFF Supply current with PQF ON

ABB LimitedPlot No. 5 & 6, II Phase Peenya Industrial Estate Bangalore 560 058 Tel: +91-80-22949560www.abb.co.in

PQF Active Filters

ABB’s PQF active filters offer unprecedented ability to clean the power supply of harmonics. They are insensitive to changes in network impedance due to alteration in network topology such as paralleling of sources and switching between mains supply and generator operation.

The PQF monitors line current in real time and processes the measured harmonics as digital signals in a high-power multi-DSP (Digital Signal Processor) based system. The digital controller generates Pulse Width Modulated(PWM) signals which drive IGBT power modules to inject harmonic currents in the network of exactly the opposite phase to the existing harmonics.

Key features of PQF Active Filters:

– Filter upto 50th order of harmonics

– Selective harmonics filtering

– Closed loop operation

– Provide dynamic reactive power / PF correction

– Load balancing

– Graphical display of all power parameters of loads and filter

– Never trip on overload

– Easy commissioning

ABB PQF Active Filters current range 30-2560 amperes, voltage range 208-690 volts AC

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