Delta Powers Healthcare Safety and Reliability for A Hospital in Jilin, China

The development of power and electronic technology over the past twenty years has propelled the invention of high-tech electronic medical instruments, such as electric surgical knives, medical imaging machines, endoscope robots, medical ventilators, and many more. The information obtained by these instruments can be gathered to a Healthcare Information Management System (HIMS) via the internet. Such integration has made possible a more prompt, comprehensive and precise medical treatment which benefits us with quality healthcare.

High-precision medical instruments and HIMS are the key factors to healthcare modernization. These instruments and systems require 24/7 operation as hospitals cannot afford any unplanned system downtime or power interruptions. The quality of power is of equal weight as its supply, since the fluctuation of voltage, current and other power values can directly influence the operation of these instruments and systems.

A large-scale teaching hospital in Jilin, northeast China, is named one of China's top 100 hospitals. The hospital adopted a wide collection of modern electronic medical instruments in great numbers, putting it at the leading edge of medical modernization in China. The instruments range from defibrillators, electrocardiogram machines, and UPSs in the operating rooms; cardiac pacemakers and electro cardiscope monitors in the ICUs; chemotherapy dosimetry systems in the radiation wing; X-rays, CTs, and MRIs in the medical imaging zone; to electronic charts of the HIMS.

While bringing people better healthcare services, these facilities are mostly of non-linear loads, creating serious harmonic distortion jeopardizing the power quality of the power grid. The current and voltage harmonic distortion interfere with the electronic components of medical instruments and cause instrument malfunctions or damage, leading to life-and-death accidents including monitor data deviation, medical imaging errors, incorrect radiation dosage, instrument over-discharging, and even the firing of electric knives.

With years of experience in power and electronics, Delta provides a power quality solution which offers exceptional power management for the instruments and systems of the hospital and reassures stability, reliability and safety for quality healthcare and hospital management.

Delta's solution adopted four units of Active Power Filters (APF2000 Series) deployed on the hospital's four main transformers. Parallel-connected to the power grid, the APFs utilized the current transformers to monitor the real-time 3-phase current waveform, obtained the required compensation harmonic current and reactive power elements, and proceeded to generate an opposite current into the power system to diminish the harmonic distortion.

With Delta's power quality solution, the current harmonic distortion was reduced from 14.2% to 4.3%, voltage harmonic distortion from 1% to 0.6%, and the current waveform was corrected back to a sinusoidal shape. The numbers represented a stable supply of high-quality power source which freed the medical instruments and systems from harmonic interference, guaranteed their normal operation, and minimized possible medical mistakes caused by power problems.

Resolving power problems worldwide, Delta's power quality solutions are successfully applied to cases such as the production of cooking utensils, car assembly lines, transportation systems, metallurgy processing, and many more, realizing Delta's continuous dedication to innovation for a changing world.