Power quality refers to the stability of electric power supply. CLP provides stable and noise-free electric power to our customers, yet such stability is prone to a number of factors:
The causes of power quality issues can be broadly classified into two categories:
Power disturbances caused by customers' own systems/equipment, for example,
Certain power quality issues are not caused by customers' own systems/equipment, for example,
Power quality issues are largely due to the compatibility of electronic equipment with the supply system. Hong Kong’s power supply is more stable and reliable today, compared to a decade ago. However, certain power quality issues still attract caution among customers, given the widespread use of high tech equipment which is highly sensitive to voltage fluctuations.
There are two major categories of power quality issues:
Please click here for more information about Voltage Dip.
Electronic equipment and switching devices being widely used (such as computers, fluorescent lamps, variable speed drives, DC motors and switch-type power sources) often create harmonics in an electric power system. This results in distortion of electric current and voltage waveforms, as well as:
How to Resolve Power Quality Issues?
Each power quality issue needs to be resolved individually. Typical solutions include installation of relevant protective devices (e.g. uninterruptible power supplies, surge suppressors, and isolating transformers), reinstallation or modification of equipment. Below are a few types of frequently used equipment for resolving power quality issues:
Uninterruptible Power Supply (UPS)
UPS is a comprehensive protective device which provides an alternative power source for the connected equipment while mitigating power interruptions or fluctuations. Among all types of UPS, the true on-line UPS systems are the most effective solutions to date.
Harmonic filters not only effectively suppress harmonics, but also help cut power demand by increasing the power factor. There are two types of harmonic filters, namely the passive filters and the active filters.
Suitable for equipment that generates constant harmonics
Suitable for equipment with dynamic harmonic distortions
CLP offers a range of power quality services to our business customers as detailed below.
Power Quality Investigation
By testing your equipment and identifying sensitive components onsite, we can recommend cost effective solutions that will improve the performance of your equipment when a voltage dip occurs. Also, by monitoring your electrical supply points, we can help identify possible types and sources of power quality problems.
Power Quality Enquiry
We can also provide a wide range of practical information to address any power quality concerns you may have.