Power Quality Under the Microscope

Changes in generation and consumption

The transition in the generator and consumer structure of Central European electrical grids is in full swing. Large-scale power plants and the centralised electrical generation they represent are gradually being replaced by more numerous but smaller decentralised generators such as wind turbines and solar panels. These, as a rule, use power electronics components to feed into the existing medium and low-voltage networks.

At the other end, ever greater numbers of consumers have joined the marketplace, which, because of the need for greater efficiency, have also obtained power electronics components. Their non-linear properties are the main cause of the increased frequency of voltage and current signal components in electrical energy grids. This development has resulted in a complex system with volatile load flows and changing load flow directions. In addition, through the legally mandated unbundling of generation, transmission and distribution, electrical energy as a product is ever more frequently transferred and billed between the most varied market participants. Thus, electricity, before it reaches the end user, may well have been produced by a number of different market participants and even transferred several times. This structure demands numerous transfer points and clearing houses, critical points where it comes to ensuring power quality.

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General Knowledge

Voltage Monitoring

Find out everything you need to know about voltage monitoring in this article. What is voltage monitoring, why is voltage monitoring essential for both energy supply companies and industrial companies and how is it implemented in compliance with standards?

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General Knowledge

What Is Load Profile Measurement/Power Measurement?

This article explains the definition and difference between load profile measurement (RLM), power measurement and measuring the standard load profile. These are important methods for accurately recording energy consumption in commercial, large industrial plant as well as in the public energy grid.

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Training Video

»PQMobil« Training Video 4: Create and Configure PQ Reports With Software WinPQ mobil

This video explains everything about creating and configuring power quality reports with »WinPQ mobil«.

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Training Video

»PQMobil« Training Video 3: Usability & Functions of the PQ-Box App

This video gives you an introduction to the usability and functions of the »PQ-Box App« for our portable power quality analysers.

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Training Video

»PQMobil« Training Video 2: Menu Navigation and Operation of the PQ-Box

In this short introductory video, we present to you how to navigate and operate our portable power quality analysers »PQ-Box 150«, »PQ-Box 200« & »PQ-Box 300« of the PQ-Box family.

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Training Video

»PQMobil« Training Video 1: Getting Started with the PQ-Box

This video shows in detail how to connect the »PQ-Box« and record measurements. The »WinPQ mobil« software is then used to visualize and analyse the measurement data and create a report.

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General Knowledge

Residual current

In this article, you will learn about residual current measurement & residual current monitoring and why it is important to measure residual current.

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General Knowledge

Power Quality

Good power quality is characterized by the fact that the mains voltage actually arriving at the consumer matches the mains voltage promised by the utility company.

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General Knowledge

Reactive power – definition, calculation and measurement

The key role of reactive power in electrical engineering: definition, calculation, measurement and the differences to active power and apparent power. Find out how reactive power influences the efficiency of electricity grids and shapes energy transmission.

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General Knowledge

What is apparent power and how is it calculated?

This article addresses the question of what apparent power is and how to calculate it. An understanding of apparent power is crucial for the correct dimensioning of inverters and therefore for the optimum efficiency and performance of photovoltaic systems.

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Info letter

Information Letter No. 24: Integration guide for the metering of a power plant according to the Requirements for Generators (2016/631) RfG

Integration guide for the measurement of a power plant (EZA) according to VDE-AR 4110 and VDE-AR 4120.

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Info letter

Info Letter No. 23: Direction of harmonics Sources of harmonics in the power system

Le sens du flux de puissance des harmoniques est déterminé par le signe de la puissance activ

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Info letter

Info Letter No. 22: Definition of power measurements according to the standards DIN 40110-2 and IEEE 1459

There is a wide range of electronic measuring devices for the digital measurement of power...

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Info letter

Info Letter No. 20: Capacitance of conductors

In the conductors of electrical power supplies, a distinction is made between the operating capacitance...

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Info letter

Info Letter No. 19: The evaluation of power quality and detection of interference in medium voltage network

For various reasons, interest in the continuous monitoring of network quality in medium-voltage...

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Info letter

Info Letter No. 8: Apparent power and reactive power in three-phase networks

The range of electromechanical and electronic measuring devices in analog - and digital technology...

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Info letter

Info Letter No. 5: Zero sequence voltage in three-phase networks

With balanced network operation and inequality of the impedances in the consumer circuit, the phase...

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Info letter

Info Letter No. 4: Summation of Alternating Currents

For the parallel connection of power sources, the principle of superposition applies, when all resources...

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Info letter

Info Letter No. 2: Measurement Transformers in three-phase networks (Part 2)

In a symmetrically loaded three-wire three-phase network, a two-pole insulated voltage transformer...

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Info letter

Info Letter No. 1: Measurement Transformers in three-phase networks (Part 1)

The direct connection of measuring devices into the network is limited for safety reasons to values...

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Webinar

»PQMobil« Webinar: Grid Analysis in Public & Industrial Power Grids with A. Eberle PQ-Boxes

Webinar recording from 2024-02-22: »PQMobil - Grid Analysis in Public & Industrial Power Grids with A. Eberle PQ-Boxes«.

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Special Publication

Ferrari´s Meter vs. Electronic Meter

This technical report analyzes a power measurement at a large industrial customer. The customer records very high currents and fifth harmonic voltages during production time, which leads to poor voltage quality.

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Special Publication

Angle determination of voltage and current harmonics in practice

Today's devices and equipment such as switched-mode power supplies, frequency converters, regulated drives, charging devices for e-mobiles or LED lighting work internally with high clock frequencies in order to regulate power efficiently. These can lead to both conducted and field-bound (coupled) influences in the energy grid. In this technical report, we explain how you can detect these sources of interference in the grid using suitable measuring technology.

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General Knowledge

All „Supra“ with your grid?

Today's devices and equipment such as switched-mode power supplies, frequency converters, controlled drives, charging devices for e-mobiles or LED lighting work internally with high clock frequencies in order to regulate power efficiently. These can lead to line-borne as well as field-borne (coupled) interference in the power grid. In this technical report, we explain how you can detect these sources of interference in the grid using suitable measurement technology.

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General Knowledge

Power Quality Analysis: Tips and Tricks II

Useful tips & tricks for handling Power Quality measuring devices and typical user errors - now in our two-part article! This article provides further insights and practical tips and application examples for power quality analysis.

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