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UNDERSTANDING POWER QUALITY AND ITS IMPORTANCE
According to Institute of Electrical and Electronic Engineers (IEEE) standard IEEE 1100, power
quality is defined as “the concept of powering and grounding sensitive electronic equipment in a
manner suitable for the equipment”.
WHY POWER QUALITY MATTERS
Power quality and supply reliability are extremely important. Our world is increasingly
dependent on electronic equipment and controls, and high sensitivity devices and processes are
heavily dependent on a clearly defined power quality. Some facilities operate 7 days a week, 24
hours a day, so incur a high cost of downtime.
Secondly, the modern power grid is continuously changing. Urbanization, living standards and
advancement in technology have increased the demand for energy. This rising demand is
growing the complexities of power grids by increasing requirement for greater reliability,
efficiency, security and environmental and energy sustainability concerns.
Many of the electric transmission grids in service around the world were designed and built
more than a half century ago. Many are unreliable, have high transmission losses, poor power
quality, prone to brownouts and blackouts, supply inadequate electricity, and discourage
integration of distributed energy sources.
In order to ensure stable processes and adequate power supply despite the struggling power
grids and increasing number of devices which generate grid distortions, steps must be taken to
improve the power quality.
Maintaining Power Quality to the level that is required by the application enables safe operation
and reduces costly downtime for organizations. It helps eliminate or reduce problems such as
power failure, equipment malfunction, overheating, flickering light, energy waste, etc.
POWER QUALITY STANDARDS
Poor power quality affects generators, distributors, and end-users of electric power. There are
several standards and guidelines to aid in understanding poor power quality from the end-user's
point-of-view. End-users such as commercial and industrial facilities use these standards as
power quality metrics.
These metrics are used to assess the impact of their own equipment on the serving distribution
grid. They are also used to assess the susceptibility of the end-user's own process,
instrumentation and control equipment to both internally and externally generated poor power
quality events.
Some important standards include:
EN 50161: Characteristics of the voltage (PQ) in public electricity supply networks.
IEEE 519: Recommended Practices and Requirements for Harmonics Control in Electrical Power
Systems.
IEC/EN 61000-2-4: Electromagnetic compatibility (EMC): Ambient conditions; compatibility level
for low frequency, conducted interferences in industrial plants.
IEC/EN 61000-4-30: Testing and measurement techniques – Power quality measurement
methods.
TYPES OF POWER QUALITY PHENOMENON
Harmonics
Harmonics are extra frequencies (multiples of fundamental frequency) that when present in an
electrical circuit, distort the AC sine wave. Harmonics are caused by non-linear electrical loads;
loads with rapidly changing energy consumption. They result in inefficient operation; excess heat
(skin effect); decreased efficiency and lifespan of equipment. Harmonics can cause overheating
in neutral conductors, and circuit breakers can trip.
Measuring harmonics can help to identify the source of harmonics in the electrical system, and
Increase operational safety and efficiency.
Sags & Swells
Voltage Sag is a decrease in rms voltage less than 0.9 pu for a duration less than 1 min. Voltage
Swell is an increase in rms voltage greater than 1.1 pu for a duration less than 1 minute.
This phenomenon is caused by heavy energy loads turning on or off (inside) or network faults
(outside), and can result in damage to machines and equipment; loss of use. Even short
interruptions can be catastrophic for sensitive applications.
Measuring can help users avoid damage and costly downtime.
Transients
Transients are high frequency energy packets which superimpose on fundamental frequency
wave and severely affect the high impedance circuit.
Transients are caused by switching operation (arcing), lightning strike or malfunction. They can
cause fast change in voltage, current or load; insulation breakdown; breaker trips and damage to
equipment.
Measuring can help avoid costly downtime and damage to equipment.
Unbalance
Unbalance refers to deviation in voltage or current waveform from perfect sinusoidal, in terms of
magnitude or phase shift is called unbalance in a system. It is caused by asymmetry of loads like
single phase loads, phase-to-phase loads or unbalanced three phase loads (e.g. welding
equipment).
Unbalance causes reduced efficiency; excess heat and overheating; device failure and damage to
equipment; reduced lifespan of equipment.
Measuring can help users increase lifespan, avoid overheating and reduce unwanted downtime.
Flicker
When voltage variations cause light density changes in lamps, it can result in visual perceptions
referred to as flicker. It is caused by load variations (furnaces, welding machines, generators,
VFDs, large motors); wind generators, and can result in visible fluctuations in brightness of a
lamp, and even possible health problems.
Measuring helps to find out what equipment within the electrical distribution is causing Flicker,
so as to minimise its impact.
Residual Current Monitoring (RCM)
RCM plays an important role in high availability supply systems such as Data Centres and
Hospitals. Rapid & direct identification of faults and insulation problems helps to avoid fire risks
and increases system availability.
RCM provides extra safety in areas in which no RCDs can be used due to operational reasons.
Preventive maintenance leads to higher productivity &uptime.
POWER QUALITY MONITORING (PQM)
Power Quality Monitoring (PQM) is the process of gathering, analyzing and interpreting raw
measurement data into useful information. PQM is often done to improve system-wide
power quality performance and includes:
• Power Quality metering, monitoring and onsite measurements
• Temporary and Permanent power quality monitoring to facilitate problem solutions
• Documenting and trending system performance to increase system reliability
Benefits of Power Quality Monitoring (DIN EN 50160)
The ability to review stored, continuously recorded waveforms helps in the diagnosis of
problems before an unwanted event recurs. Power quality analysis can also be used for pre-
function testing to look closely at systems and their responses and to simulate transients and
other events.
Power quality analytics could pinpoint what the root cause was e.g. an electrical spike, or a
floating ground. Thus, PQM offers many benefits. These include:
• Secure, high-availability power supply
• Assured quality of the electrical energy through continuous monitoring and analysis
• Avoidance of overload situations
• Avoidance of production stoppages
• Maximisation of operating time
• Ensuring product quality and stable processes
• Production-related quality assurance by monitoring the local power quality
• Optimisation of maintenance costs
JANITZA AND POWER QUALITY MONITORING
For efficient power quality monitoring, power measurement and analysing, Messung presents
Janitza's UMG 512 PRO - a fixed Class A power quality analyzer in compliance with IEC 61000-4-
30 Class A and IEEE 519-2014 standards.
Janitza offers complete solutions for PQM and Energy Management Systems. Janitza's energy
measurement technology offers threefold benefits in a single system:
• Energy management as per ISO 5001 to reduce energy costs and improve energy
efficiency
• Power quality monitoring as per EN 50160 to reduce downtime, optimise maintenance
• Residual current monitoring to identify insulation faults faster and improve supply
reliability
Janitza offers solutions for every level of monitoring:
1. Mains Supply (PCC): UMG 512-PRO
2. Low-voltage main distribution (LVMD): UMG 509-PRO
3. Sub-distribution: UMG 96-PA
4. Machine, building, cost centre: UMG 614-PRO
5. Sub-measurement: UMG 103-CBM
Complete package for PQM as per IEC 61000-4-30
Janitza offers a complete, advanced package of device, software and apps for efficient PQM as
per latest industry standards. It includes:
• Power Quality Analyzer, Class A according to IEC 61000-4-30
• GridVis visualisation software for energy management systems and for power quality
monitoring
• Janitza apps – application software with know-how
CONCLUSION
Messung Electrical Engineering is the authorised distributor for Janitza electronics GmbH, world
leader in development and manufacture of energy management solutions. Janitza's cutting-
edge digital energy meters, universal measurement devices, power quality analyzers, peak
demand management systems, RCM devices, etc. have placed them amongst the leading
suppliers in this market.
In India, as it becomes mandatory for industries, infrastructure projects, data centres, etc. to
install power quality meters and analyzers as per the latest IEEE 519-2014 and IEC 61000-4-30
standards, Janitza’s advanced yet cost-effective technology is increasing in relevance.
Janitza’s state-of-the-art solutions, backed by Messung’s in-depth knowhow and support, can
help customers implement the optimal system - that fulfils mandatory requirements and helps
you ensure power quality, maintain supply stability, protect assets and reduce costs.
MESSUNG SYSTEMS PVT. LTD
PUNE (HO),501, 502, 503, Lunkad Sky Vista,Viman Nagar, Pune - 411014, India.
Tel: +91 20 66492800 www.messungelectricalengineering.com Email:info@messung.com

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UNDERSTANDING POWER QUALITY AND ITS IMPORTANCE

  • 1. UNDERSTANDING POWER QUALITY AND ITS IMPORTANCE According to Institute of Electrical and Electronic Engineers (IEEE) standard IEEE 1100, power quality is defined as “the concept of powering and grounding sensitive electronic equipment in a manner suitable for the equipment”. WHY POWER QUALITY MATTERS Power quality and supply reliability are extremely important. Our world is increasingly dependent on electronic equipment and controls, and high sensitivity devices and processes are heavily dependent on a clearly defined power quality. Some facilities operate 7 days a week, 24 hours a day, so incur a high cost of downtime. Secondly, the modern power grid is continuously changing. Urbanization, living standards and advancement in technology have increased the demand for energy. This rising demand is growing the complexities of power grids by increasing requirement for greater reliability, efficiency, security and environmental and energy sustainability concerns. Many of the electric transmission grids in service around the world were designed and built more than a half century ago. Many are unreliable, have high transmission losses, poor power quality, prone to brownouts and blackouts, supply inadequate electricity, and discourage integration of distributed energy sources. In order to ensure stable processes and adequate power supply despite the struggling power grids and increasing number of devices which generate grid distortions, steps must be taken to improve the power quality. Maintaining Power Quality to the level that is required by the application enables safe operation and reduces costly downtime for organizations. It helps eliminate or reduce problems such as power failure, equipment malfunction, overheating, flickering light, energy waste, etc.
  • 2. POWER QUALITY STANDARDS Poor power quality affects generators, distributors, and end-users of electric power. There are several standards and guidelines to aid in understanding poor power quality from the end-user's point-of-view. End-users such as commercial and industrial facilities use these standards as power quality metrics. These metrics are used to assess the impact of their own equipment on the serving distribution grid. They are also used to assess the susceptibility of the end-user's own process, instrumentation and control equipment to both internally and externally generated poor power quality events. Some important standards include: EN 50161: Characteristics of the voltage (PQ) in public electricity supply networks. IEEE 519: Recommended Practices and Requirements for Harmonics Control in Electrical Power Systems. IEC/EN 61000-2-4: Electromagnetic compatibility (EMC): Ambient conditions; compatibility level for low frequency, conducted interferences in industrial plants. IEC/EN 61000-4-30: Testing and measurement techniques – Power quality measurement methods. TYPES OF POWER QUALITY PHENOMENON Harmonics Harmonics are extra frequencies (multiples of fundamental frequency) that when present in an electrical circuit, distort the AC sine wave. Harmonics are caused by non-linear electrical loads; loads with rapidly changing energy consumption. They result in inefficient operation; excess heat (skin effect); decreased efficiency and lifespan of equipment. Harmonics can cause overheating in neutral conductors, and circuit breakers can trip. Measuring harmonics can help to identify the source of harmonics in the electrical system, and Increase operational safety and efficiency.
  • 3. Sags & Swells Voltage Sag is a decrease in rms voltage less than 0.9 pu for a duration less than 1 min. Voltage Swell is an increase in rms voltage greater than 1.1 pu for a duration less than 1 minute. This phenomenon is caused by heavy energy loads turning on or off (inside) or network faults (outside), and can result in damage to machines and equipment; loss of use. Even short interruptions can be catastrophic for sensitive applications. Measuring can help users avoid damage and costly downtime. Transients Transients are high frequency energy packets which superimpose on fundamental frequency wave and severely affect the high impedance circuit. Transients are caused by switching operation (arcing), lightning strike or malfunction. They can cause fast change in voltage, current or load; insulation breakdown; breaker trips and damage to equipment. Measuring can help avoid costly downtime and damage to equipment. Unbalance Unbalance refers to deviation in voltage or current waveform from perfect sinusoidal, in terms of magnitude or phase shift is called unbalance in a system. It is caused by asymmetry of loads like single phase loads, phase-to-phase loads or unbalanced three phase loads (e.g. welding equipment). Unbalance causes reduced efficiency; excess heat and overheating; device failure and damage to equipment; reduced lifespan of equipment. Measuring can help users increase lifespan, avoid overheating and reduce unwanted downtime. Flicker When voltage variations cause light density changes in lamps, it can result in visual perceptions referred to as flicker. It is caused by load variations (furnaces, welding machines, generators, VFDs, large motors); wind generators, and can result in visible fluctuations in brightness of a lamp, and even possible health problems. Measuring helps to find out what equipment within the electrical distribution is causing Flicker, so as to minimise its impact. Residual Current Monitoring (RCM) RCM plays an important role in high availability supply systems such as Data Centres and Hospitals. Rapid & direct identification of faults and insulation problems helps to avoid fire risks and increases system availability. RCM provides extra safety in areas in which no RCDs can be used due to operational reasons. Preventive maintenance leads to higher productivity &uptime. POWER QUALITY MONITORING (PQM) Power Quality Monitoring (PQM) is the process of gathering, analyzing and interpreting raw measurement data into useful information. PQM is often done to improve system-wide power quality performance and includes:
  • 4. • Power Quality metering, monitoring and onsite measurements • Temporary and Permanent power quality monitoring to facilitate problem solutions • Documenting and trending system performance to increase system reliability Benefits of Power Quality Monitoring (DIN EN 50160) The ability to review stored, continuously recorded waveforms helps in the diagnosis of problems before an unwanted event recurs. Power quality analysis can also be used for pre- function testing to look closely at systems and their responses and to simulate transients and other events. Power quality analytics could pinpoint what the root cause was e.g. an electrical spike, or a floating ground. Thus, PQM offers many benefits. These include: • Secure, high-availability power supply • Assured quality of the electrical energy through continuous monitoring and analysis • Avoidance of overload situations • Avoidance of production stoppages • Maximisation of operating time • Ensuring product quality and stable processes • Production-related quality assurance by monitoring the local power quality • Optimisation of maintenance costs JANITZA AND POWER QUALITY MONITORING For efficient power quality monitoring, power measurement and analysing, Messung presents Janitza's UMG 512 PRO - a fixed Class A power quality analyzer in compliance with IEC 61000-4- 30 Class A and IEEE 519-2014 standards. Janitza offers complete solutions for PQM and Energy Management Systems. Janitza's energy measurement technology offers threefold benefits in a single system: • Energy management as per ISO 5001 to reduce energy costs and improve energy efficiency • Power quality monitoring as per EN 50160 to reduce downtime, optimise maintenance • Residual current monitoring to identify insulation faults faster and improve supply reliability
  • 5. Janitza offers solutions for every level of monitoring: 1. Mains Supply (PCC): UMG 512-PRO 2. Low-voltage main distribution (LVMD): UMG 509-PRO 3. Sub-distribution: UMG 96-PA 4. Machine, building, cost centre: UMG 614-PRO 5. Sub-measurement: UMG 103-CBM Complete package for PQM as per IEC 61000-4-30 Janitza offers a complete, advanced package of device, software and apps for efficient PQM as per latest industry standards. It includes: • Power Quality Analyzer, Class A according to IEC 61000-4-30 • GridVis visualisation software for energy management systems and for power quality monitoring • Janitza apps – application software with know-how CONCLUSION Messung Electrical Engineering is the authorised distributor for Janitza electronics GmbH, world leader in development and manufacture of energy management solutions. Janitza's cutting- edge digital energy meters, universal measurement devices, power quality analyzers, peak demand management systems, RCM devices, etc. have placed them amongst the leading suppliers in this market. In India, as it becomes mandatory for industries, infrastructure projects, data centres, etc. to install power quality meters and analyzers as per the latest IEEE 519-2014 and IEC 61000-4-30 standards, Janitza’s advanced yet cost-effective technology is increasing in relevance. Janitza’s state-of-the-art solutions, backed by Messung’s in-depth knowhow and support, can help customers implement the optimal system - that fulfils mandatory requirements and helps you ensure power quality, maintain supply stability, protect assets and reduce costs. MESSUNG SYSTEMS PVT. LTD PUNE (HO),501, 502, 503, Lunkad Sky Vista,Viman Nagar, Pune - 411014, India. Tel: +91 20 66492800 www.messungelectricalengineering.com Email:info@messung.com