UNDERSTANDING POWER QUALITY AND ITS IMPORTANTCE
                     
UNDERSTANDING POWER QUALITY AND ITS 
IMPORTANCE
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INTRODUCTION - MESSUNG SYSTEMS PVT LTD
• Messung started its journey in 1981.
• For nearly four decades, Messung has been at the forefront of 
industrial automation in India.
• Today, our portfolio and prowess extends far beyond this field 
to Home, Office & Hotel Automation, Building & Infrastructure 
Automation, Power Distribution, Workplace Ergonomics, 
Electronic Assembly and Test & Measuring.
www.messungelectricalengineering.com
OUR BUSINESSES
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CONTENTS
• What is Power Quality and why 
you should care
• Power Quality Disturbances
• Power Quality Monitoring
• Janitza Products Overview
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BASIC CONCEPT OF AN ELECTRICITY
• An Electricity is a fuel which is required for any 
Electrical equipment to operate in its intended 
manner.
• Unusual Commodity
• Required as a continuous flow.
• Cannot be conveniently stored in a quantity.
• Electric Power: It is a Rate at which work is done.
• P = V X I X COSØ…………………For AC Circuits
• P = V X I ………………………….For DC Circuits
• Electric Energy: when power is applied for certain 
duration of time, an energy gets consumed by an 
equipment.
• Every equipment is designed to operate on certain 
rated conditions, these conditions are mentioned on 
the Nameplate of an equipment.
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PERFECT AND NON PERFECT GRID
PERFECT GRID NON PERFECT GRID
AMPLITUDE AMPLITUD
E
3
TIME TIME
VOLTAGE WAVEFORM
CURRENT WAVEFORM
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WHAT IS POWER QUALITY AND 
WHY YOU SHOULD CARE
• Power Quality
• "The concept of powering and grounding 
sensitive equipment in a manner that  is 
suitable to the operation of that equipment."
• Electronic equipment & controls are 
increasing
• System control and energy efficiency is a 
priority
• The modern power grid is changing
• High dependence on reliable electrical 
systems
• Some Facilities operate 7 days a week, 24 
hours a day
• Many facilities have high cost of downtime
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CONSEQUENCES 
• Energy efficiency and Power Quality is 
increasingly a concern of organizations
• Maintaining Power Quality to the level 
that is required by the application enables 
safe operation and reduces costly 
downtime.
• Power failure, malfunction, overheating, 
flickering light, energy waste, etc.
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POWER QUALITY STANDARDS
EN 50160 Characteristics of the voltage (PQ) in public 
electricity supply networks
Recommended practices and requirements 
IEEE 519 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
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TYPES OF POWER QUALITY 
PHENOMENON 
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HARMONICS
• Harmonics are extra frequencies 
(multiples of fundamental frequency) that 
when present in an electrical circuit, 
distort the AC sine wave  
• Causes: Non-linear electrical loads; 
Loads with rapidly changing energy 
consumption
• Consequences: Inefficient operation; 
Excess heat (skin effect); Overheating in 
neutral conductors; Decreased efficiency 
and lifespan of equipment; Circuit 
breakers can trip 
• Benefit of measuring: Identify the 
source of harmonics in the electrical 
Capacitors destroyed due to 
harmonics system; Increase operational safety and 
efficiency
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SAGS AND SWELLS
• Voltage Sag is a decrease in rms voltage less 
than 0.9 pu for a duration less than 1 
minute
• Voltage Swell is a increase in rms voltage 
greater than 1.1 pu for a duration less than 
1 minute
• Causes – Heavy energy loads turning on or 
off  (inside) or network faults (outside)
• Consequences – Damage to machines and 
equipment; Loss of use; Short interruptions 
can be catastrophic for sensitive applications
• Benefit of measuring – Avoid damage and 
costly downtime
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TRANSIENTS
• Transients are high frequency energy packets which 
superimpose on fundamental frequency wave and severely 
affect the high impedance circuit
• Causes: Switching operation (arcing), lightning strike or 
malfunction
• Consequences: Fast change in voltage, current or load; Can 
lead to insulation breakdown; Breaker trips and damage to 
equipment
• Benefit of measuring: Avoid costly downtime and damage to 
equipment
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UNBALANCE
• Deviation in voltage or current waveform 
from perfect sinusoidal, in terms of 
magnitude or phase shift is called unbalance 
in a system. 
• Causes: Asymmetry of loads like single 
phase loads, phase-to-phase loads or 
unbalanced three  phase loads (e.g. welding 
equipment)
• Consequences: Reduced efficiency; Excess 
heat and overheating; Device failure and 
damage to equipment; Reduced lifespan of 
equipment
• Benefit of measuring: Increase lifespan; 
Avoid overheating; Reduce unwanted 
downtime
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FLICKER
• Voltage variations cause light density 
changes in lamps, which can result in visual 
perceptions referred to as flicker
• Causes: Load variations (furnaces, welding  
machines, generators, VFDs, large motors); 
Wind  generators
• Consequences: Visible fluctuations in 
brightness of a lamp; Possible health 
problems
• Benefit of measuring: Find out what 
equipment within the electrical distribution is 
causing Flicker
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RESIDUAL CURRENT 
MONITORING
• RCM plays important role in high availability 
supply systems such as Data Centres and 
Hospitals
• Rapid & direct identification of faults and 
insulation problems
• Avoids fire risks and increases system 
availability
• Extra safety in areas in which no RCDs can 
be used due to operational reasons
• Preventive maintenance = higher 
productivity & uptime
• TN-S system (5-conductor network) – Basic precondition 
for the safe operation of IT equipment, machinery 
• and networked systems including residual current 
monitoring
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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
• Power Quality Monitoring 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
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BENEFITS OF POWER QUALITY 
MONITORING (DIN EN 50160)
Secure, highly- Assured quality of the Avoidance of Avoidance of production 
availability power electrical energy through overload stoppages
supply continuous monitoring and situations
analysis
Maximisation of Ensuring product Production-related quality Optimisation of the 
operating times quality/stable processes assurance by monitoring the maintenance costs
local power quality
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ONE SYSTEM THREE BENEFITS
Energy Manageme Power Quality Residual Current
nt EN50160 Monitoring
ISO 5001
• Reduces downtime • Identifies insulation 
• Reduces energy • Optimizes faults faster
costs maintenance • Improves supply 
• Improves energy reliability
efficiency
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LEVELS OF MONITORING
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PORTFOLIO OF DEVICES On its capabilities 
UMG103
-CBM UMG96RM UMG96RM-E UMG801 MOD-800
UMG96PA
UMG604 UMG512PRO
UMG804 UMG96RM-EL UMG96RM
-CBM
UMG96PA
-MID
EC-1 EC-2 EC-3 UMG605
UMG509
UMG96RM-M UMG96RM-P UMG804 BCPM
EI-1 ED-1 UMG96PA
-MODULES
UMG96S2
UMG96RM-PN
RCM202 RCM201
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JANITZA UMG 512-PRO
• Power Quality Analyzer, Class A according to 
IEC 61000-4-30
• High Accuracy: Active Energy Class 0.2S  Voltage 0.1%, 
Current 0.1%
• Modbus Master / Gateway & Modbus RS485
• Modbus TCP, FTP, SMTP, SNMP, Bacnet, Profibus
• All communication protocols are working simultaneously
• NTP and PTP time synchronisation
• Jasic PLC Programming
• Memory 256 MB
• Digital I/O, (2 In & 2 Out), Temperature Input
• 2 Analogue Inputs for RCM Measurement or Temperature  
Measurement
• Logging of currents and voltages  (15 – 440 Hz)
• Recording of over 2,000 measurement values
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JANITZA SOFTWARE
GridVis software 
Visualisation software for energy 
management systems and for 
power quality monitoring.
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JANITZA APPS – APPLICATION 
SOFTWARE
WITH KNOW-HOW
• APPs can be called up via the measurement 
device homepage
• Web-based data display and configuration
• No software installation required
• Data can also be displayed directly in the 
browser on mobile devices such as an iPad
• Extremely cost-effective and convenient solution
• User-defined settings enable a low data volume
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APP Mini EnMs
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THANK YOU
Contact us
MESSUNG SYSTEMS PVT. LTD.
501, 502 & 503 Lunkad Sky Vista, Viman Nagar, Pune, India - 411 014.
+91 20 6649 2800 | [email protected]
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