• Harmonics Analysis
  • Spikes Analysis
  • Transients
  • Voltage Sags and swells
  • Voltage and Current Unbalance

The Power Quality Audit (PQA), is a service offered by A2Z that checks the reliability, efficiency and safety of an organisation's electrical system.

Power quality determines the fitness of electrical power to consumer devices. It also refers to the relative frequency and severity of deviations in the incoming power supplied to electrical equipment from steady or fundamental 50 Hz, sinusoidal waveform of voltage or current. These deviations may affect the safe or reliable operation of electrical equipments such as circuit breakers, motors, fans, CNC machines, computers etc.

​One of the biggest problems in power quality aspects is the harmonics content in the electrical system. Generally, harmonics may be divided into two types: voltage harmonics and current harmonics. Current harmonics is usually generated by harmonics contained in voltage supply and depends on the type of load such as resistive load, capacitive load, and inductive load.


  • To Improve Power Factor & system efficiency.
  • To Avoid Break-downs & production Interruptions
  • To Avoid excess Energy consumption.
  • To remove Harmonics, Surges & Transients from electrical Network.
  • To Avoid Voltage/frequency fluctuations & PLC Hang-up.
  • To Avoid Transformer overheat, Capacitor burst, Trip Etc.
  • Savings in Energy Bills due to reduced Losses & KVA demands.
  • Accurate Measurements by Installed Meter.
  • Better Production Rate and Quality due to reduced interruption.
  • Enhanced Life cycle of Electrical network & component.
  • Maximize Plant distribution Capacity.

The effects of power quality problems vary from one piece of equipment to another and with the age of the equipment.
The quality of electric power is vital for both, electric utilities and its customers.
The major problems faced by the stake holders are

  1. Consumer Side
  • Intermittent failure of computer equipments
  • Interference with data communication equipments
  • Malfunction of Process Controllers
  • Stalling of motors on start up
  • Inaccurate Power Metering
  • Constant risk of fatal electrical shock
  1. Utility Side
  • Increased Transmission and Distribution losses
  • Overloading of Cables, Transformers and Switchgears
  • Tripping of Circuit Breakers and residual current devices
  • Incorrect operation of solid state relays

Measurement and Analysis in the following specific areas:

  • Measurement & Analysis and resolution of problems
  • Monitoring load unbalancing
  • Power Factor analysis
  • Transients
  • Voltage, Current, KW and KVA analysis.
  • Peak Voltage and current, Frequency.
  • Analysis of spikes
  • Analysis of Frequency
  • Flicker measurements.
  • Crest Factor for V and I.
  • K factor for currents.
  • V and I unbalance in %.
  • Total Harmonics Distortion (THD) for voltage, current up to the 50th order.