Introduction
The PQA450 Power Quality Analyser is designed to assess and improve power quality in industrial settings. It addresses issues caused by non-linear loads and unstable operations, which are critical for industries like semiconductors and automotive manufacturing.

System Overview
The PQA450 system is based on the LMG450 power meter, enhanced by the NDL5 data logger. It allows for long-term data recording and analysis, with configuration and data transfer capabilities via networks. The system includes evaluation software for data display and reporting.

Key Features

• Ensures correct connection to supply mains using the LMG450 display.
• Continuous display of recent measurements.
• Non-intrusive measurement using ZES ZIMMER current clamps.
• Simultaneous monitoring of current, voltage, and power.
• Compliance with EN50160 power quality standards.
• Time and frequency domain analysis, with statistical evaluation.
• Configuration and data transfer via serial interface or Ethernet.

Disturbance Analysis Procedure
The document outlines a structured approach to disturbance analysis, including initial examination, diagnosis through long-term measurement, and implementation of corrective actions.

Case Studies
Example 1: Computer Network Disturbance
A computer network in an industrial plant experienced distortions due to voltage fluctuations caused by a rectifier. The PQA450 identified the rectifier as the source within one day, compared to a week with traditional methods.

Example 2: Residential Area Flicker
High flicker levels were detected near a steelwork operating a DC arc furnace. The PQA450 identified interharmonics as the cause, and a simple filter adjustment resolved the issue.

Technical Specifications

• Voltage and current measuring ranges with specified nominal and maximum values.
• Isolation and overload capabilities.
• Measurement accuracy based on specific conditions.
• Interfaces for data processing and signal registration.
• Physical dimensions and environmental specifications.

Software and Data Handling
The PQAgent software, compatible with Windows, configures the measuring device and evaluates results. It supports various measurements, including TRMS values, harmonics, power factors, flicker, and voltage interruptions. Data can be stored continuously or triggered by events.

Conclusion
The PQA450 provides a comprehensive solution for power quality analysis, offering precise measurement, efficient data handling, and effective disturbance resolution.