Harmonic distortion influences a variety of mission critical applications from municipal waste water pumps to offshore drilling rigs and ship propulsion systems, and includes highly demanding hospital and airport applications. A distorted system voltage in a hospital or airport affects the reliable operation of sensitive equipment and in the event of any interruption, even extremely short, may lead to loss of life. Due to the critical nature of this issue, the IEEE Std 519 1992 specifies < 3% Total Harmonic Voltage Distortion (THD (V)) for hospitals and airports compared to other applications where THD (V) of <5% is acceptable. Therefore, the harmonic mitigation solution chosen by hospitals and airports is a consequential decision requiring extreme reliability while adhering to the strictest of regulatory requirements.
As the world’s foremost authority on harmonics mitigation, Mirus International has been at the forefront of developing world-class power quality improvement products for a myriad of applications, often called to solve some of the most challenging harmonic problems. Mirus has continuously proven that its solution – Lineator™ Passive Harmonic Filter – is effective in reducing Variable Frequency Drive (VFD) harmonics by up to 10 times with none of the inherent problems of conventional filters.
One such example includes a hospital in Haifa, Israel - Rambam Health Care Hospital and Campus – a 1,000-bed academic hospital serving more than two million people in northern Israel. In an effort to save energy the hospital purchased two new Chillers at 240kW each for their cooling system. The new Chillers were equipped with VFD’s which consumed far less energy per cooling ton but drew current from the electrical supply in nonlinear pulses causing the hospital’s supply voltage to become increasingly distorted. Since the distorted system voltage could ultimately affect the reliable operation of sensitive equipment in the hospital, it required an effective and immediate resolution. The solution? After much review the hospital selected the Lineator Passive Harmonic Filter which enabled the simultaneous operation of the two Chillers by reducing the current harmonic pollution by more than 2/3 and lowering voltage distortion from almost 4% to <1.5%, well below the IEEE 519-1992 requirements. In addition, the operating temperature of the drives and Chillers was reduced by more than 10°C, increasing their life expectancy and reliability. Read more on this application; please download the case study at http://www.mirusinternational.com/downloads/Case-Study-Rambam-Hospital-Israel.pdf
“Mirus’ Lineator™ filter has been engineered and manufactured to treat even the most challenging of harmonic applications. For Rambam Hospital the no-setup approach, requiring just fitting the filter to the drive rating and motor type, provided the best solution for reduced harmonics in this retrofit system and ensured that harmonic pollution limits were met.” says Al Archambault, Director of Sales, Mirus International.
About Mirus International
Mirus designs and develops world class power quality improvement products for mission critical operations. Their uniquely specialized product line includes highly efficient harmonic filters, transformers, autotransformers and Data Center power distribution equipment. Comprised of a leading team of power quality experts, Mirus’ solutions minimize disruption to the power supply, improve reliability and adhere to the strictest of regulatory requirements while also saving energy. Proven to perform, Mirus products are available globally and are real-world tested in its own Harmonics & Energy (H&E) Lab.
