Signs Your Facility Needs a Power Quality Audit

Power quality problems rarely announce themselves clearly. They show up as a pattern of small, seemingly unrelated annoyances that plant teams learn to work around — until the cumulative cost, in energy, equipment life, and downtime, becomes too large to ignore. Here’s how to recognize the pattern before it gets there.

1. Your electricity bill has a power factor penalty line

The most direct signal. If your monthly bill shows any surcharge tied to power factor, or if you’re not confident what your actual PF is running at across a full production cycle (not just the billed average), that alone justifies a measurement exercise.

2. Equipment fails or trips without an obvious cause

Nuisance tripping of protection devices, capacitor banks that hum audibly or fail earlier than their rated life, transformers running hotter than their loading suggests they should — these are classic symptoms of harmonic distortion or resonance that a standard electrical maintenance check won’t necessarily catch, because the waveform, not just the current magnitude, is the problem.

3. Sensitive equipment misbehaves intermittently

PLCs resetting, VFDs faulting, instrumentation giving erratic readings, or IT/control room equipment rebooting unexpectedly — especially when it correlates with a nearby machine starting, a crane operating, or a welding line running — points to voltage sag, transients, or harmonic pollution propagating through the plant’s internal distribution.

4. Motors and transformers run hot or fail early

Elevated operating temperature beyond what load calculations predict, or a pattern of motor winding failures and transformer issues clustering around certain feeders, often traces back to harmonic heating or voltage imbalance rather than simple overload.

5. You’ve recently added VFDs, UPS systems, or other power electronics

Every non-linear load added to a facility shifts its harmonic profile. A plant that was clean five years ago can develop a real distortion problem after a modernization project introduces several VFDs — ironically, often while pursuing energy efficiency gains that the VFDs genuinely deliver on the mechanical side.

6. You’re planning an expansion or new connection

Before adding load, sizing new transformers, or negotiating a higher sanctioned demand with the utility, a power quality audit establishes the real baseline — both to right-size new equipment and to catch existing issues before they’re inherited by (and blamed on) new installations.

What an audit actually involves

A proper power quality audit combines sustained power analyzer logging (voltage, current, kW, kVAR, THD, and transient/sag events) across a representative production period with a physical inspection of switchgear, capacitor banks and thermal imaging of key connections. The output isn’t a generic checklist — it’s a quantified picture of where your reactive power, harmonic distortion, and thermal risk actually sit, and what correction (if any) is proportionate.

Related reading: see our power quality audit service, or if the concern is specifically consumption patterns and cost, our energy audit offering.