Maintaining high-quality steady-state power is vital for the reliable operation and longevity of industrial equipment. This technical document from Circuit Energy outlines the statistical levels used to evaluate continuous power supply quality and avoid equipment failure.

Key Performance Levels

Evaluating power quality involves comparing the current state of the system against established safety and design thresholds.

• Assessed Level: The current, real-time quality of the system, typically determined through precise measurements over a set period, such as one week.
• Planning Level: The design target set by electric utilities, intentionally kept below the compatibility level to provide a safety buffer.
• Compatibility Level: The benchmark level for steady-state voltage quality that a supply should not exceed.
• Equipment Immunity Level: The threshold at which equipment performance begins to degrade if surpassed.
• Equipment Damage Level: The critical point where power quality endangers equipment well-being, leading to overheating, harmonic resonance, or high neutral currents.

Why Threshold Gaps Matter

To ensure equipment functions without malfunctioning or sustaining damage, it is critical to maintain clear gaps between the supply’s compatibility level and the equipment’s immunity or damage levels. If power quality remains within these specified limits, the steady-state supply is considered acceptable for consumer use