rwwengheaderHarmonic Filtering (Passive)

Certain machinery and equipment generate harmonics. Sources of harmonics include variable speed drives (process industries, lifts, air conditioning, pumps, etc.), uninterruptible power supplies, electronic equipment such as computers. Certain types of reactive power compensation equipment can make the problem worse if not designed correctly.

Voltage distortion caused by harmonics can result in the malfunction and damage of many types of equipment requiring high-quality electricity, such as computers and telephones. Voltage distortion may also overload cables and cause failures of relays or fuses.

Most of the industrial and commercial loads produce harmonic currents, which reduce the power quality level of the system. The most economical and simple way is to use Harmonic Filters.

A passive harmonic filter is equipment consisting of increasing the power quality circuit elements such as capacitor, reactor and resistor. It is used for reactive power compensation while eliminating unwanted harmonic currents. It provides a low impedance path at one or more specified frequencies in the network, which prevents the currents at those frequencies from flowing to the grid. Moreover, since they also make reactive power compensation, they provide voltage support to the network, reduction in electricity charges and improvement in Power Factor. They are used in all industries such as cement, mining, textile, iron & steel factories, etc. Harmonic Filters are preferred over Conventional Compensation due to several reasons, some of which are:

    • Restrained inrush currents, and
    • Lower risk of parallel resonance
    • Reduction in harmonics and improved power

RWW have 30 years of experience in design and implementation of different types of harmonic filters at transmission and distribution voltage levels. RWW can complete the following scope:

  • Power quality measurement prior to design,
  • Cost-effective equipment design and selection
  • Correct selection of location are some of the important things in the design of harmonic filters to avoid risks of over-currents and over-voltages in the network.

Without having the necessary knowledge on these, an unqualified and inexperienced implementer may bring harm to both the customer and grid.

RWW Engineering can provide harmonic filters with the following specifications:

  • Tuned or detuned frequency
  • Single phase or three phase
  • Single order, second order (e.g. C-type) or more
  • 0.4kV to 400kV system voltage
  • 0.1MVAr to 200MVAr reactive power
  • Indoor or outdoor implementation
Active Harmonic Filtering, STATCOM and SVCGrid Code Compliance