Power Quality Analysis 2026: Guide to Measurement & Assessment

Power quality analysis is a key tool in 2026 for systematically measuring and reliably assessing power quality, disturbances, and network impacts. The article is aimed at utilities, grid operators, and industrial companies that need to create grid transparency, narrow down causes, and document technical measures in a standards-compliant way. In practical terms, the focus is on relevant measured variables, suitable measurement systems, the correct interpretation of standards, and the question of when mobile analyzers are the right choice and when permanently installed systems offer clear advantages. At the same time, the guide shows how measurement, evaluation, and corrective action can be meaningfully combined.

• Rather than simply recording measured values, power quality analysis also provides a technical interpretation of disturbances, trends, and limit violations. What matters most is the combination of standards-compliant measurement, sound interpretation, and traceable documentation.

• Depending on the type of grid, the voltage level, and the application, different normative reference points apply. In practice, EN 50160, IEC 61000-2-2, IEC 61000-2-12, IEC 61000-2-4, and IEC 61000-4-30 are among the most relevant standards.

• While mobile analyzers are particularly suitable for temporary troubleshooting, root-cause analysis, and on-site measurement campaigns, permanently installed systems show their strengths wherever measurement points need to be monitored continuously and events documented on an ongoing basis.

• A. Eberle addresses both requirements: with mobile PQ-Box systems for flexible measurements, and with PQI-LV, PQI-DE, PQI-DA smart, I-Sense, and WebPQ® for continuous monitoring and centralized evaluation.
• However, good power quality analysis does not end with the measurement itself. Reports, trend analysis, before-and-after comparisons, and the derivation of technical measures are what make the results truly useful in day-to-day operation.

What Is Power Quality Analysis? Fundamentals and Significance

At its core, power quality analysis refers to the structured measurement and evaluation of electrical variables in order to assess supply quality objectively at a defined point in the grid. Unlike basic monitoring, it is not limited to displaying values; it also supports the technical interpretation of causes, effects, and repeatable patterns. That distinction becomes especially important in grids with power-electronic loads, decentralized generation, and sensitive processes.

Definition and Objectives of Power Quality Analysis

Power quality refers to the electrical characteristics that enable the safe, stable, and standards-compliant operation of grids and systems. Power quality analysis records these characteristics in a structured way, evaluates them against suitable normative reference points, and creates a reliable basis for technical decisions. This is particularly important when complaints, disturbances, unclear causes, or documentation requirements for internal and external stakeholders are involved.

In day-to-day operation, this does not concern only classic fault events. Gradual changes such as increasing harmonic content, recurring voltage dips, or operation close to permissible limits in low-voltage systems can also have a considerable impact on processes, equipment, and plant availability. Power quality analysis creates the necessary transparency to identify not only symptoms, but also the technical causes behind them

Key Power Quality Parameters in the Grid

The most important measured variables include voltage, frequency, flicker, and voltage harmonics. Depending on the grid type and the application, other values may also be relevant, such as supraharmonics, transients, unbalance, or event-based disturbance recordings. Which parameters matter most in a specific case depends on the measurement point, the voltage level, and the technical question being addressed.

For public grids, EN 50160 is a key framework for assessment. In low-voltage networks, IEC 61000-2-2 is also relevant; in medium-voltage networks, IEC 61000-2-12; and in industrial networks, IEC 61000-2-4. For the measurement process itself, IEC 61000-4-30 is the decisive standard. In addition, IEC 61000-4-7 plays an important role for harmonics and supraharmonics, while IEC 61000-4-15 is relevant for flicker.

Why Is Power Quality Analysis More Important Than Ever in 2026?

The requirements for power quality analysis are increasing because load and feed-in behavior are changing significantly. At the same time, A. Eberle identifies applications involving photovoltaics, e-mobility, battery storage, heat pumps, industrial facilities, and critical infrastructure as important fields for power quality monitoring across several product and knowledge pages. This shows that power quality analysis is no longer merely a specialized subject, but has become an integral part of stable and well-documented grid operation.

At the same time, the number of power-electronic components in the grid continues to rise. As a result, not only conventional voltage and frequency deviations are becoming more relevant, but also harmonic and higher-frequency phenomena. Anyone who does not measure and assess these influences properly risks misinterpretation, unnecessary measures, or delayed responses in operation.

Challenges and Trends in Power Quality Analysis

New Requirements Driven by the Energy Transition and Digitalization

The energy transition is noticeably changing the requirements for measurement and assessment. Decentralized generation, charging infrastructure, heat pumps, and battery storage systems are changing load profiles and network impacts down to lower voltage levels. For this reason, A. Eberle positions PQI-LV, PQI-DE, PQI-DA smart, and I-Sense in particular for applications where greater transparency is required in the distribution grid and in secondary substations.

At the same time, the need for timely evaluation is growing. Anyone assessing grid quality today must not only capture measurement data, but also turn it into decisions more quickly. This applies equally to grid operators and to industrial companies with sensitive processes, critical distribution structures, or increased documentation requirements.

Technological Developments and Measurement Methods

From a technological perspective, power quality analysis can broadly be divided into mobile and permanently installed approaches. Mobile analyzers such as the PQ-Box family are designed for troubleshooting, measurement campaigns, and root-cause analysis directly on site. Permanently installed systems such as PQI-LV, PQI-DE, or PQI-DA smart, by contrast, are suitable for continuous monitoring, centralized documentation, and the ongoing observation of critical measurement points.

In addition, I-Sense expands permanently installed analyzers with feeder current measurement for up to 16 feeders in the secondary substation. This means that power quality analysis becomes more transparent not only at the transformer itself, but also in downstream feeders. For evaluation, WebPQ® provides a central platform for permanently installed systems, while WinPQ mobil supports mobile analysis with the PQ-Box family.

Data Volume and Interpretation

Modern power quality analysis produces very large data volumes in a short time. In one application report, A. Eberle describes that more than 500,000 measured values may be generated during a one-week measurement at a point of common coupling according to EN 50160 and IEC 61000-2-2. This makes it clear that, in practice, the bottleneck is often not data acquisition itself, but the structured preparation and interpretation of the data.

This is precisely where evaluation tools become critical. A. Eberle describes WebPQ® as a central analysis software platform for permanently installed disturbance recorders and power quality monitoring devices. Among other things, the software offers simultaneous readout of multiple measurement points, automatic reporting and alarming, drill-in analysis, dashboards, and live diagrams. For mobile measurements, WinPQ mobil handles standards-oriented evaluation, report generation, and event analysis.

Normative Orientation in 2026

In 2026, the decisive factor is not so much a generalized “new wave of regulation” as it is a clean normative orientation tailored to the application. Anyone assessing grid quality needs a clear understanding of which standard applies at the respective measurement point and which standard governs the measurement process itself. A. Eberle emphasizes exactly this distinction on its knowledge and product pages.

In practice, this means that EN 50160 describes the characteristics of voltage in public electricity supply networks, IEC 61000-2-2 and IEC 61000-2-12 define compatibility levels in low-voltage and medium-voltage networks, IEC 61000-2-4 addresses industrial networks, and IEC 61000-4-30 specifies the measurement method. Without this clear distinction, any power quality analysis remains technically incomplete.

Effects on Grid Operation and Security of Supply

If measurements are missing or interpreted incorrectly, causes often remain unclear. As a result, complaint handling, planning, and documentation toward third parties become more difficult, while the prioritization of technical measures is affected as well. Good power quality analysis reduces this uncertainty because it documents events in a reproducible way and thereby creates comparability at the same time.

This is a major advantage particularly in sensitive processes, critical infrastructure, and complex distribution grids, because even minor anomalies can have far-reaching consequences there. For this reason, A. Eberle identifies data centers, industrial plants, main and sub-distribution boards, residential districts with PV systems and charging points, and secondary substations as typical environments in which continuous monitoring creates operational value.

Step-by-Step Guide: Power Quality Analysis in Practice

Step 1: Define the Objective and Measurement Scope

Every power quality analysis starts with the question of what exactly needs to be clarified from a technical point of view. Is the objective to investigate recurring disturbances, provide a standards-compliant verification, assess a point of common coupling, or create long-term transparency at a critical site? Only once this objective has been clearly defined can the measurement point, measurement duration, and device be selected appropriately.

Choosing the right measurement location is just as important. In practice, this may include main switchboards, sub-distribution boards, points of common coupling, secondary substations, transformer stations, or even individual loads. In more complex situations, measurement points should be selected in such a way that causes can be narrowed down spatially and before-and-after comparisons can be established.

Step 2: Selecting Suitable Hardware

The choice of measurement system depends on the voltage level, the measurement task, and the required duration. For continuous monitoring in low-voltage networks, PQI-LV is an obvious option. For more demanding applications in low-, medium-, and high-voltage networks, PQI-DE and PQI-DA smart are relevant choices. For mobile on-site analyses, PQ-Box ONE and PQ-Box 150 are particularly suitable.

Criterion	Mobile Analysis	Permanently Installed Monitoring
Typical task	Troubleshooting, measurement campaigns, on-site diagnostics	Continuous monitoring, trend analysis, verification
Suitable A. Eberle solutions	PQ-Box ONE, PQ-Box 150, PQ-Box 300	PQI-LV, PQI-DE, PQI-DA smart
Typical evaluation	WinPQ mobil	WebPQ®
Main advantage	High flexibility at the measurement point	Long-term transparency and reproducible documentation

The distinction between mobile and permanently installed measurement technology is also a central topic on A. Eberle’s knowledge pages and should be made clearly before the measurement begins.

Step 3: Measurement and Data Acquisition

The measurement campaign should be planned so that all relevant operating conditions are captured. Where sporadic disturbances are suspected, short-term measurements are often not sufficient; in many cases, several days or even a full week are therefore useful. Only then can load changes, switching operations, and recurring events be recorded properly.

Equally important is standards-compliant installation and parameterization. Only if the measuring device, connection type, trigger settings, and evaluation basis fit together does a reliable basis for later assessment emerge. According to A. Eberle’s tips-and-tricks guidance, this is exactly where practical user errors frequently occur.

Step 4: Data Analysis and Interpretation

After the measurement, the real value creation of power quality analysis begins. At this stage, the focus is not only on individual limit violations, but also on patterns, time correlations, and the question of whether an event occurs randomly, systematically, or due to operating conditions. For that reason, the evaluation should consistently bring together events, trends, and normative context.

For mobile measurements, WinPQ mobil is suitable with automatic standards-based evaluations and reporting functions. For permanently installed systems, WebPQ® creates a central view of measurement points, live values, disturbances, and reports. In this way, raw data acquisition becomes technically reliable interpretation.

Step 5: Deriving Measures and Optimization

Good power quality analysis leads to concrete technical measures. Depending on the cause, these may include changes to filters, load distribution, parameter settings, operating equipment, or the measurement structure itself. What matters is that the measure is not derived from assumptions, but from objectively documented measurement data.

Equally important is follow-up measurement. Only a comparison before and after implementation shows whether the measure has actually improved power quality. For audits, complaints, or internal approvals, this verification is often more valuable than the initial measurement alone.

Step 6: Documentation and Reporting

Only once the results have been documented in a traceable way is a power quality analysis truly complete. This documentation includes the measurement period, the measurement point, the device used, the relevant normative reference points, significant events, the technical assessment, and the recommended measures. At the same time, it must be understandable internally and reliable externally.

A. Eberle emphasizes structured report generation and evaluation in both WinPQ mobil and WebPQ®. In practice, this is especially useful because it enables standard reports, trend visualizations, and objective evidence to be generated efficiently.

Tools & Technologies for Modern Power Quality Analysis

Market Overview: Measuring Devices and Software Solutions

From a practical perspective, three building blocks can be distinguished: mobile analyzers for flexible measurements, permanently installed systems for continuous monitoring, and software for centralized evaluation. A. Eberle reflects this structure with the PQ-Box family, the permanently installed PQI systems,I-Sense, and the software solutions WinPQ mobil and WebPQ®.

Category	Typical task	Suitable A. Eberle solutions
Mobile power quality analysis	Troubleshooting, on-site measurements, temporary campaigns	PQ-Box ONE, PQ-Box 150
Permanently installed monitoring	Continuous surveillance, trend analysis, multi-point concepts	PQI-LV, PQI-DE, PQI-DA smart
Extended grid transparency	Capturing feeder currents in the secondary substation	I-Sense
Centralized evaluation	Reports, dashboards, live values, alarming	WebPQ®
Mobile evaluation	Standards-based reports and on-site analysis	WinPQ mobil

Selection Criteria for Practice

When selecting a system, five points should be at the forefront:

• Does the device fit the voltage level and the measurement location?
• Is the measurement standards-compliant, for example according to IEC 61000-4-30 Class A?
• Does it capture exactly the phenomena that are relevant in the specific grid, such as harmonics, supraharmonics, transients, or flicker?
• Can the evaluation be translated efficiently into reports, comparisons, and decisions?
• Can the system be expanded, if required, to cover additional measurement points or feeders?

Innovative Technologies in 2026

Today, innovation lies above all in the combination of measurement, connectivity, and structured evaluation. A. Eberle describes WebPQ® as a central analysis software platform with simultaneous readout of all measurement points, automatic report generation and alarming, drill-in analysis, dashboards, and live diagrams. This significantly accelerates assessment, especially when multiple measurement points need to be monitored in parallel.

Practice has also changed on the mobile side. Systems such as PQ-Box ONE and PQ-Box 150 are no longer just measuring devices; they are part of an evaluation workflow that includes triggering, long-term recording, app- or software-based connectivity, and standards-oriented reporting. This makes mobile power quality analysis far more reproducible than a single isolated measurement without proper follow-up.

A. Eberle: Precision Solutions for Power Quality Analysis

For continuous monitoring, A. Eberle offers permanently installed analyzers such as PQI-LV, PQI-DE, and PQI-DA smart, which are described on the product pages as suitable for low-, medium-, and high-voltage applications, or specifically for low-voltage monitoring. These are complemented by I-Sense for feeder current measurement in the secondary substation and by WebPQ® as the central analysis software.

For mobile tasks, PQ-Box ONE and PQ-Box 150 represent two different approaches: on the one hand, compact, user-oriented socket measurements in low-voltage networks; on the other hand, a versatile mobile Class A analyzer for more extensive on-site analysis. This makes it possible to adapt the measurement technology to the specific question without losing sight of the comparability of results.

Standards and Regulatory Requirements 2026

Relevant Standards for Power Quality Analysis

The normative basis of any power quality analysis must fit the measurement point. The following overview brings together the key references cited on A. Eberle’s pages on Power Quality and related measuring devices.

Standard	Practical significance
EN 50160	Characteristics of voltage in public electricity supply networks
IEC 61000-2-2	Compatibility levels in public low-voltage networks
IEC 61000-2-12	Compatibility levels in public medium-voltage networks
IEC 61000-2-4	Compatibility levels in industrial networks
IEC 61000-4-30	Measurement methods for power quality measurements, often relevant as Class A
IEC 61000-4-7	Assessment of harmonics and supraharmonics
IEC 61000-4-15	Flicker measurement method

What Matters in Practice in 2026

In 2026, what matters most is aligning power quality analysis carefully with the application and the applicable normative reference. Anyone measuring in a public low-voltage network is not assessing under the same conditions as someone working in an industrial network or at a complex point of common coupling. For that reason, the normative reference, the measurement method, and the reporting basis should all be defined before the measurement starts.

The same applies to device selection. On several product pages, A. Eberle explicitly lists Class A-compliant measurement according to IEC 61000-4-30 as a feature of PQI-LV, PQI-DE, PQI-DA smart, PQ-Box ONE, and PQ-Box 150. This makes it clear that measurement quality is not a secondary issue, but the foundation of the entire analysis process.

Effects on Companies and Grid Operators

For companies and grid operators, this means greater discipline in measurement concepts, reporting, and root-cause analysis. Today, power quality analysis often has to address several levels at once: technical assessment, internal decision-making, external traceability, and, where relevant, complaint handling or audit capability.

Anyone who establishes a clean measurement and evaluation concept benefits from greater transparency and shorter clarification paths. Instead of treating individual cases in isolation, trends, recurring patterns, and the effects of measures can be tracked more systematically.

Best Practices for Implementation

A proven approach is to think about the measurement objective, normative reference, measurement duration, evaluation, and reporting together from the very beginning. In practice, a combination of standards-compliant measurement, automated reporting, and targeted follow-up measurement after implementing technical measures works especially well.

It is equally useful to distinguish clearly between temporary root-cause analysis and long-term monitoring. Not every question requires a permanently installed system right away. Conversely, recurring disturbances, sensitive processes, or distributed measurement points are rarely well served by isolated spot measurements alone.

Practical Examples and Success Factors from Industry

Practical Example 1: Standards-Compliant Assessment at a Point of Common Coupling

One A. Eberle application report shows how power quality problems can be measured and evaluated in a standards-compliant way using a PQ-Box and WinPQ mobil. It describes a one-week power quality measurement at a point of common coupling according to EN 50160 and IEC 61000-2-2, with the results prepared automatically in statistical form. The example is practical because it shows the path from measurement to traceable evaluation in a clear and structured way.

Practical Example 2: Continuous Monitoring in Critical Infrastructure

Another A. Eberle example is power quality monitoring in the JUPITER data center. The associated application report describes very high requirements for power quality and availability, along with a scalable monitoring structure based on more than 120 measurement points. For this article, the example is especially relevant because it shows how power quality analysis can evolve from isolated spot measurements to system-wide, continuous monitoring.

Success Factors for Sustainable Power Quality

Power quality analysis only becomes sustainably effective when it is not treated as a one-off action. Key success factors are a clearly defined normative reference, suitable measurement technology, evaluation with a structured reporting concept, and the willingness to derive technical measures from measurement data and then verify their effectiveness again.

Equally important is the right combination of mobile and permanently installed systems. Mobile systems help identify specific causes, while permanently installed solutions create long-term transparency and enable trend analysis across multiple measurement points. A. Eberle systematically covers exactly this combination with the PQ-Boxes, PQI systems, I-Sense, and WebPQ®.

Future Challenges and Opportunities

The complexity of electrical networks will continue to grow. As a result, the importance of power quality analysis that consistently combines measurement, evaluation, and documentation will also increase. In the future, it will become even more important to connect measurement points intelligently, interpret data more quickly, and substantiate technical measures in a technically robust way.

For this very reason, power quality analysis is not a peripheral topic, but an operational tool for grid stability, availability, and technical decision-making certainty. Anyone who invests early in reliable measurement and evaluation processes creates the basis for calmer, more transparent, and more standards-compliant grid operation.