EM Energy Solutions Power Quality Measurment Services

Power Quality measurement services

EM Energy Solutions’ power quality measurement services provide you an opportunity to assess the current status of various power quality parameters in your facilities and benchmark them against applicable power quality standards. The findings of the power quality measurements and recommendations for possible solutions, if so required, are presented in a post-measurement power quality report.

Power quality measurement services are delivered to our clients outside of Norway, typically by our global expert network of distribution partners. In Norway, or in countries where we don’t have a partner trained to do measurements, these services are arranged by EM Energy Solutions. As a specialized company in the field of power quality, EM Energy Solutions gives you unmatched expertise from problem definition to solution identification and implementation, together with our global distribution network.


Measurements are the basis for troubleshooting, verification, or sustainable optimization of power quality. We check your power supply network for voltage fluctuations, reactive power, harmonic oscillations, and other network disturbances, and by doing so, uncover potential ways to optimize costs and detect potential disturbance factors.


Disturbances of the electrical power supply are not always clearly visible. Sometimes it is the result of increased energy consumption or the premature wear of equipment. The resulting costs and investments often burden the operation of a plant considerably.

Particularly unbalanced loads and power electronics have risen rapidly in the last years due to technical progress and automation. Sensitive control electronics react sensitively to harmonics and other disturbing factors in the power supply.


  • Voltage L-N / L-PEN / L-L (depending on grid type)
  • Current of the three phases
  • Current of the Neutral (including unbalance and zero sequence harmonics)
  • Active, Reactive and Apparent Power
  • Power Factor and Displacement Power Factor
  • Frequency and Voltage Unbalance
  • Harmonic Current and Voltage up to 50th order
  • Interharmonic Current and Voltage up to 50th order and above (9 or 20 kHz, depending on equipment)
  • Voltage Transients up to 1 MHz
  • Short- and Long Term Flicker

Objectives of power quality measurements

Power quality measurements are typically carried out to fulfill one or more of the following requirements:


  • To benchmark against contractual obligations or grid code criteria and power quality recommendations
  • Performance benchmarking of equipment or plant
  • To help make the predictive maintenance

Common Problems

Power quality measurements are typically carried out to fulfill one or more of the following requirements:


  • Sporadic plant disturbances, mostly in connection with the operation of other equipment
  • Faulty measuring, control and regulation technology (e.g. false alarms, mostly due to insufficient EMC)
  • Overheating and overloading of plants or plant parts (e.g. transformers)
  • Premature equipment failures (e.g. power supply units)
  • Triggering of switches and protective devices (false triggering)
  • Defective reactive power compensation equipment
  • Flickering lights (flicker

Scope of power quality measurement services

EM Energy Solutions’ power quality measurement services consist of a variety of measurements that can be tailored according to your specific needs. These power quality measurements typically include are:

  • Harmonic measurements
  • Voltage sags, swells, and interruptions measurements
  • Motor start-up studies
  • Reactive power measurements
  • Flicker severity studies
  • Transients and spikes studies

Customer benefits

A power quality audit performed by an experienced company can deliver several benefits for the industrial or commercial customers which includes but are not limited to the following:

  • Improved insight into the plant’s and/or equipment’s power quality, and identification of their current and future hazards
  • Sufficient data to back up and make well-informed investment decisions
  • Correctly sizing the mitigation solution
  • Avoiding unexpected outages