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📝 Technical Guide

What Is a Power Analyzer? A Selection Guide

24.05.2026  ·  7 min read

What is a power analyzer, and what does it measure? A comparison of the Schneider PM5350, Siemens PAC3200 and ABB B series. A guide to EMS integration over Modbus TCP.

What Is a Power Analyzer? A Selection Guide | Argus EMS

What Is a Power Analyzer?

A power analyzer (also called a power quality analyzer) is an electronic device that measures the voltage, current, power and energy parameters of electrical systems with high precision. It is used in factories, hospitals, shopping malls and large office buildings for energy efficiency monitoring, billing and power quality analysis.

What Does a Power Analyzer Measure?

  • Voltage (V): L1-N, L2-N, L3-N phase voltages and L1-L2, L2-L3, L3-L1 line voltages
  • Current (A): Per-phase current and neutral current
  • Active Power (kW): The component of power that performs real work
  • Reactive Power (kVAr): Inductive and capacitive components — critical for EPDK reactive penalty calculations
  • Apparent Power (kVA): Total power consumption
  • Power Factor (cos φ): The ratio of active to apparent power; the ideal value is 1.0
  • Energy (kWh, kVArh): Cumulative consumption registers
  • THD: Total harmonic distortion — analysis of frequency harmonics
  • Frequency (Hz): Grid frequency quality
  • Peak Demand: Maximum kW/kVA and the time it occurred

Popular Power Analyzer Models

The models most commonly encountered in industrial facilities in Türkiye:

  • Schneider Electric PM5350 / PM8000: Modbus TCP, DLMS/COSEM, BACnet. For medium and large facilities.
  • Siemens PAC3200 / PAC3220: Modbus TCP/RTU. Widespread in power distribution panels.
  • ABB B21 / B24 / M2M: MID approved, for sub-tenant billing.
  • Socomec DIRIS A40: RS-485 Modbus. Panel mount. Integrated with power factor correction control.
  • Eastron SDM630: Low cost, RS-485 Modbus RTU. For small facilities and sub-meters.

Power Analyzer vs. Basic Meter

A basic electricity meter measures only the kWh value. A power analyzer, by contrast, measures hundreds of parameters with multiple samples per second, records power quality events, and transmits this data to a remote system over a protocol. An analyzer is mandatory for EPDK reactive penalty tracking and harmonic analysis.

Choosing the Right Analyzer

Consider the following criteria when selecting an analyzer:

  • Protocol: Modbus TCP, RTU or BACnet/IP, depending on your existing infrastructure
  • Accuracy class: IEC 62053-22 Class 0.5S (billing), Class 1 (monitoring)
  • Harmonic analysis: At least up to the 15th harmonic, preferably up to the 50th harmonic
  • Data logging: A built-in data logger preserves data during connection outages
  • CT options: Compatibility with your existing CTs (500/5A, 1000/5A, etc.)
FAQ

Frequently Asked Questions

Is a power analyzer the same thing as a meter?
No. A basic meter measures only kWh. A power analyzer measures hundreds of parameters such as power quality, harmonics, power factor and peak demand, and transmits them to a remote system over a protocol.
Which accuracy class should be chosen?
For billing purposes, IEC 62053-22 Class 0.5S is preferred. For monitoring and energy management only, Class 1 is sufficient. For sub-tenant billing, a MID-approved device is preferred.
Why is THD monitoring important?
Harmonics cause transformer overheating, reduced motor efficiency and overloading of power factor correction panels. High THD (>5%) shortens equipment lifespan and increases the risk of reactive penalties.
Can EPDK reactive tracking be done without a power analyzer?
No. kVAr measurement is mandatory for reactive energy tracking. A basic kWh meter does not measure this value. EPDK-compliant tracking requires at least a Class 1 power analyzer.

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