Background Hankook is a world famous tire brand from South Korea. Since entering China in 1996, the company has invested more than 600 million US dollars to establish a complete production, logistics and sales network system. It is a high-tech factory with an annual output of 10 million tires in Jiaxing, Zhejiang. Due to the low power factor in the on-site distribution system, the company urgently...
Power Quality Problems With the in-depth application of power electronic technology, the automation of the petrochemical industry has been continuously improved, and the nature of the load has also undergone qualitative changes. The increase of nonlinear and impact loads has brought about voltage flicker, three-phase imbalance, and excessive reactive power consumption. , harmonics and a series of ...
Power Quality Problems There are a large number of power electronic components in medical equipment. The more common equipment are MRI (nuclear magnetic resonance apparatus), CT machine, X-ray machine, DSA (cardiovascular imaging machine) and so on. Among them, MRI will generate radio frequency pulses and alternating magnetic fields to generate nuclear magnetic resonance, and radio frequency pulse...
What is power quality? The IEC (1000-2-2/4) standard defines power quality as follows: power quality refers to the physical characteristics of power supply devices that do not interrupt or interfere with users' use of power under normal working conditions. The most serious power quality problems are voltage sags and complete voltage interruptions. In fact, power quality refers to the...
3 phase load current imbalance In three phase systems, current unbalance is defined as the maximum deviation of any phase current from average divided by average current. Current unbalance can occur due to reasons within the control of the end user or outside the control of end user. Some of the reasons for current unbalance (or imbalance) are: Source voltage from the electric utility is unbalance...
What is EMC testing EMC test (Electro Magnetic Compatibility) refers to the comprehensive evaluation of electromagnetic interference (EMI) and anti-interference capability (EMS) of electronic products. It is one of the most important indicators of product quality. The measurement of electromagnetic compatibility consists of test sites and test instruments. The purpose of EMC test is ...
Power Quality Background A perfect electrical supply would deliver a constant frequency sinusoidal voltage waveform with unvarying magnitude. In daily work, power supplies deviate from this ideal situation because system loads vary and phenomena such as transients and outages may occur. If the power quality of the network is good, loads connected to it will run satisfactorily and efficiently. Insu...
Variable Speed Drives (VSDs) Do you have AC motors in your facility?Do these motors need a variable output? The growing popularity of Variable Speed Drives (VSDs) is a key driver of energy efficiency, but Variable Speed Drives cause power quality problems, one of which is the harmonics within power systems. So networks requires more effective means to mitigate harmonics. In C...
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