Posted by messungelectricalengineering on February 27th, 2021


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 analysers, peak demand management systems, etc. have placed them amongst the leading suppliers in this market.

Amidst growing concerns regarding energy consumption and power quality, and with upcoming legislation from Indian government, Indian industries have to necessarily implement energy management systems  that meet high international standards. Efficient energy management systems are the only way forward.

For efficient power quality monitoring, power measurement and analysing, Messung presents Janitza's UMG 512 PRO - a fixed Class A power quality analyser in compliance with IEC 61000-4-30 Class Aand IEEE 519-2014standards.

But first, let’s understand power qualityand its relevant international standards.


Power qualityrefers to a set of electrical boundaries defined by various documented rules designed to allow electrical equipment to function in its intended manner without significant loss of performance or life expectancy. This includes the steady and stable supply of electricity delivered by the grid. In order to achieve this aim, it is necessary to constantly and vigilantly monitor the power conditions within an electrical network. There are a large number of parameters involved in this, but surprisingly, many of these power quality parameters have not been well defined. This is where the IEC 6100-4-30 comes in.

ABOUT IEC 61000-4-30

61000-4-30 is an IEC power quality measurement standard that defines the correct measuring algorithms for power quality instruments. It defines methods for measurement and interpretation of power quality parameters in 50/60 Hz AC power supply systems.

This standard ensures that different PQ instruments use the same definitions, and measurement techniques for various power quality parameters: sags/dips, swells, frequency, harmonics, flicker, etc. By standardizing the measurement methodologies, IEC 61000-4-30 creates the ability to obtain reliable, repeatable and comparable results using any compliant meter.

 The IEC 61000-4-30standard defines the measurement method, accuracy and time aggregation to verity of power quality parameters in 3 performance classes to obtain repeatable and comparable results.

Class A – must to comply to the highest performances and accuracy level to obtain repeatable and comparable results

Class S – accuracy levels are less stringent. Class S Power quality analysers can be used for statistical surveys and contractual application where comparable measurement is not required

  1. Class B – Class B performance is defined to avoid making any existing instrument designs obsolete


  •          Power frequency
  •          Magnitude of supply voltage
  •          Flicker (by reference to IEC 61000-4-15)
  •          Supply dips/swells
  •          Voltage Interruptions
  •          Voltage unbalance
  •          Voltage harmonics (by reference to IEC 61000-4-7)
  •          Voltage Inter-harmonics (by reference to IEC 61000-4-7)
  •          Mains signaling
  •          Under- and over-deviation
  •          Rapid voltage changes
  •          Flicker class F1
  •          Magnitude of the current
  •          Current unbalance
  •          Current harmonics (by reference to IEC 61000-4-7)
  •          Current interharmonics (by reference to IEC 61000-4-7)
  •          Recording of current along with voltage during events


Due to legal reasons, Class A is almost mandatory for power utilities

  •          IEC61000-4-30 defines the correct measuring algorithms for power quality monitoring instruments
  •          Instruments that meet Class A performance, when connected to the same signals, will produce the same results
  •          Class A instruments must meet the highest performance and accuracy requirements in the standard
  •          This standard ensures that different PQM instruments use the same definitions, and measurement techniques,             for various power quality parameters: sags/dips, swells, frequency, harmonics, flicker, etc.…


ABOUTIEEE 519-2014

IEEE is the Institute of Electrical and Electronics Engineers. IEEE 519-2014 is a document that establishes levels of voltage and current harmonic distortion acceptable to the distribution system based on the input transformer characteristic and the loads on a customer’s facility. Goals for designing electrical systems that contain both linear and non-linear loads are established in this standard. The existed voltage and current waveforms in every part of the system are explained, and the waveform distortion goals for the system designer are established.

Many electrical consultants are including compliance with IEEE 519-2014in their design specifications to help reduce harmonic problems and avoid penalties that can be imposed by electrical utilities.

The standard is periodically updated as the industry evolves. Since its introduction in 1981, the standard has been updated several times and its latest edition is IEEE 519-2014.


The Janitza UMG 512-PRO is particularly well suited to the monitoring of power quality in accordance with current standards, e.g. EN 50160, IEEE519 or EN 61000-2-4.

 Main features

Class A: Certified to the IEC 61000-4-30standard, it provides detailed specifications that a mains analyser must meet so that the results can also be consulted in case of disputes. The standard defines the necessary parameters, suitable measurement methods, accuracy and bandwidths. This makes it possible to easily reproduce and compare results.

Power quality: Reliable operation of modern plants and systems always demands a high degree of supply reliability and good power quality. UMG 512 PRO reliably records, analyses and documents all interferences such as harmonics, unbalance, transients, voltage dips, voltage swells, flickers, phase shifts and reactive power.

Residual Current Monitoring (RCM) : Powerful RCM residual current monitoring already detects leakage currents in their initial stages before they cause system failures or even fires. Continuous RCM monitoring increases the system safety and availability significantly.

Measuring devices homepage: The web server for the measuring device provides a wide range of data in a user-friendly format. The user does not have to install any software on their PC; a conventional web browser is all that is required. In addition to the modern homepage, APPs are available for an extended range of functions.

Ethernet-Modbus-Gateway: The Ethernet Modbus gateway can be used to easily include the Modbus RTU devices that are connected to the master device as slaves in an Ethernet architecture. This is also possible via a Modbus RTU interface for devices with identical file formats and matching function codes.

BACnet: As soon as a UMG measuring device has received its BACnet ID and is integrated into the network, the system recognises it and displays it in the browser. This makes configuration very easy.

UMG 512 PRO Application

Continuous monitoring of the power quality

• Harmonics analysis with power qualityproblems

• Checking the internal supply network according to EN 61000-4-7, EN 61000-4-15, IEC 61000-4-30

• Fault analysis in case of problems with the energy supply

• Documentation of the power qualityfor customers and regulatory authorities

• Ethernet Gateway for subordinate measurement points

• Report generator for power quality standards: EN 50160, IEEE 519, EN61000-2-4, ITIC …

• Report generator for energy consumptions

• Energy Dashboard

• Remote monitoring of critical processes


Power qualityand supply reliability are extremely important. High sensitivity devices and processes are heavily dependent on a clearly defined power quality In order to ensure stable processes and adequate power supply despite the increasing number of devices which generate grid distortions, steps must be taken to improve the power quality.

In India, it is becoming mandatory by law for industries, infrastructure projects, data centres, etc. to install power quality metersand analysers as per the latest  IEEE 519-2014and IEC 61000-4-30 standards.

Janitza offers a comprehensive range to improve the power quality Janitza’s state-of-the-art, cost-effective UMG 512 PRO, 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.

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Joined: February 27th, 2021
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