This 1 day course includes both the theoretical and practical aspects of power quality.

It will be suited to Engineers, Electricians and Technicians who require a greater appreciation of Power Quality and the effects it can have on equipment and an installations’ electrical supplies.

Power quality is the interaction of electrical power with electrical equipment. If electrical equipment operates correctly and reliably without being damaged or stressed, you could argue that the power is of good quality. But if the equipment does not operate correctly or is damaged due to voltage transients, for example, then you could say the power quality is poor. Usually, power companies and their customers prefer an alternating current with a pure sinusoidal shape. This leads to efficiency in the distribution and consumption of the supplied power within an installation.

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A list of electrical power characteristics that could affect this perception of quality include:

  • Frequency
  • Voltage level
  • Voltage sags and swells
  • Short term interruptions (brownouts)
  • Longer term interruptions (blackouts)
  • Voltage transients
  • Harmonic voltages
  • Flicker
  • Power factor

The course includes the following:

Electrical Generation and Distribution

  • How we generate electricity
  • The distribution of electricity

A Review of Electrical Circuits and Quantities

  • Direct Current DC
  • Alternating Current AC
  • Representing AC as Vectors
  • Inductance and Capacitance
  • Impedance
  • Electrical Power
  • Power Factor
  • Power System Quantities under Non-sinusoidal Conditions
  • Three-phase voltages, currents and power

Electrical installations

  • Distribution of supplies
  • Earthing and Bonding

What is Power Quality?

  • Qualifying Power Quality
  • Cost of Power Quality

Understanding Power Quality Concepts and Characteristics

  • Supply Impedance
  • Voltage Dips (or sags)
  • Impulsive Transient
  • ITIC and CBEMA Curves
  • Mitigations against voltage dips
  • Voltage Swells
  • Transients

Harmonics

  • Fourier Theorem
  • Individual harmonic components
  • Total Harmonic Distortion (THD)
  • Current or voltage THD
  • Origins of Harmonic Currents
  • Harmonic voltages
  • Flow of harmonic currents in distribution networks
  • Indicators of harmonic distortion
  • Problems caused by Harmonics
  • Resonance
  • Mitigation against Harmonics

Voltage Unbalance

  • Unbalanced Voltage On Polyphase Induction Motors
  • Effect of Unbalance on Variable Speed Drives
  • Mitigation of Voltage unbalance
  • Measurement of Unbalance using of Power Quality Recorders

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Flicker

  • How Flicker is perceived
  • Estimation of voltage fluctuations
  • Measurement of short-term flicker severity
  • Standards for flicker limits
  • Mitigation of Flicker

Standards in Power Quality

Power Quality Instruments

  • Power Quality Instrument Operation
  • Current Sensing
  • The Rogowski Coil
  • Measurement Standards
  • Instrument Safety
  • Safe Working Practices

Electro-Magnetic Compatibility (EMC)

  • EMC Characteristics
  • Mitigating EMC in electrical installations
  • Common Mode Impedance Coupling
  • Capacitive coupling
  • Inductive coupling
  • Radiated coupling
  • Counter-measures
    • Earthing principles and structures
    • Equipotential bonding inside buildings
    • Cabling measures

Practical demonstrations with various up to date power quality instruments.

Our trainers have considerable experience in the surveying and analysis of electrical installations for the purposes of establishing the quality of the power supplies. Using the latest power quality analysis equipment the course includes case studies to demonstrate the various effects of poor power quality.

Please contact us for details of course dates and pricing.

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