Power Quality

Power Quality

Distribution and transmission systems are constantly exposed to all kinds of power quality phenomena. Each of these phenomena can potentially damage this large and complex system. Damages to the equipment, reducing their lifespan and maintaining costs of permanent phenomena, every year imposes great costs to the network administrators. Damages to the power systems due to the power quality phenomena are:


  • Damages to equipment due to sudden incidents such as sudden changes in the grid voltage, transients or power swing.
  • Damages that wear out the equipment and reduce their lifespan
  • Additional annual costs of permanent phenomena such as losses on lines and transformers due to harmonic distortion.

Behrad Consulting Engineers Company background and experiences

Since 2003 BCE has been involved in the field of power quality studies and projects in various provinces of Iran. We own 12 power quality measurement devices from world famous brands at our disposal. Assessment of power quality indices, suggestions to fix problems and determining the origin of harmonic distortions and flicker in transmission, sub-transmission and distribution networks of Northern Khorasan, Razavi Khorasan, Southern Khorasan, Sistan and Baluchestan, Kermanshah, Ilam, Kordestan, Ardebil, Khuzestan, Isfahan, Hamedan, Tehran, Yazd, Lorestan, Markazi, East Azarbaijan, Gilan, Zanjan and Fars provinces are among the experiences of BCE. We Also have the bragging rights of preparing the five-year comprehensive power quality plan for Tehran Regional Electric Company in 2010, which can be considered the country's largest power quality project to date.

In particular, BCE's notable projects in some of  Iran's provinces are:


  • In 2005, a power quality study was conducted for 88 nodes of the grid in different levels of voltage in the provinces of Northern Khorasan, Razavi Khorasan and Southern Khorasan.
  • In 2007, a power quality study was conducted for 38 nodes of the grid in the 20kV, 132kV and 400kV in the provinces of Razavi Khorasan and Southern Khorasan.
  • In 2008, a power quality study was conducted in 400kV substations of Kamal, Ghaen and Nishabur's combined cycle power plant in Razavi Khorasan and Southern Khorasan provinces
  • In 2009, a power quality study was conducted for 92 nodes of the grid in the 20kV, 132kV and 400kV in the provinces of Razavi Khorasan and Southern Khorasan. At this point the problem of capacitor resonance in Dusti-4 dam substation which was resulting in the explosion protection fuse of these capacitors was also addressed.
  • From 2012 to 2015 BCE was consulting Isfahan Regional Distribution Company for the audit of power quality indices in industrial areas of Isfahan province.
  • In 2013 a study was conducted to determine the share of harmonics produced by each of subscribers and to identify the source of the pollution caused by harmonic distortions in Zanjan Regional Electric Company.
  • In 2014, a power quality study was conducted for 40 nodes of the grid in different levels of voltage in the provinces of Kerman.

The way we get the power quality studies done
Full knowledge of the network status, command of its strengths and weaknesses and identifying factors which distance the network from its ideal state are necessary for proper operation and control of the grid. To do this, it is necessary to use suitable network monitoring systems. Monitored indicators are compared with their required standard limits across the network, specifically at the energy exchange areas and at the Point of Common Coupling (PCC) for customers. Due to economic constraints and practical restrictions, it is necessary to optimize the selection of nodes in need of monitoring. By reviewing the existing network and assessing the clients, especially large industrial customers and selecting appropriate locations in accordance with limitations required by the employer, we install monitoring devices for a limited time to gather power quality indices of the network. We then compare the indices across the network, pinpoint the problematic parts of the grid and propose solutions for each of those problems.



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Esfahan, Iran, 8136713833


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+98 31 32332766
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