Power System Studies

Power Quality Study

Diagnose what's tripping your VFDs. Quantify what's killing your batches.

Voltage sags trip drives. Harmonics overheat motors. Flicker fails GMP audits. Imbalance starves three-phase loads. A power quality study isolates which one is your problem, quantifies severity per IEEE 519 and IEC 61000, and engineers the mitigation · all signed off by a Chartered Engineer.

Why this matters

Why power quality is the silent killer of brownfield plant uptime

When a batch fails or a line stops, the operator blames the drive. The drive vendor blames the controls. The controls vendor blames the protection settings. Everyone is right · because none of them has measured the supply. A power quality study installs class-A IEC 61000-4-30 instrumentation at the right buses for the right duration, captures the full spectrum of voltage and current anomalies, and tells you exactly which phenomenon is causing the failure · harmonics, sag, swell, flicker, imbalance, or transient. From there the mitigation is engineering · active filters, line reactors, dynamic voltage restorers, sag conditioners, or upstream contracts with the utility. Until you measure, every fix is a guess.

Method

How we deliver Power Quality Study

CEng MIE India-signed deliverables · LiDAR-powered where applicable · digital twin handover ready · routes to the Power System Studies practice lead within 24 hours.

Measurement campaign

Class-A IEC 61000-4-30 power quality analysers installed at PCC, MCC, and critical-load buses. Minimum 1-week continuous capture covering at least one full production cycle. Voltage, current, harmonic spectrum, flicker, dip-swell catalogued.

Data analysis

Capture compared against IEEE 519, IEC 61000-2-2, EN 50160. Each anomaly categorised (waveform distortion vs amplitude variation vs short-duration event). Origin localised (upstream utility vs downstream load).

Root-cause isolation

Cross-correlation between measurement bus and DCS/PLC alarm log to map each anomaly to a production event. VFD-tripping waveform fingerprinted, batch-failure timestamp matched to sag signature.

Mitigation engineering

Per-phenomenon mitigation sized · active harmonic filters, line reactors, K-rated transformers, dynamic voltage restorers, static VAR compensators, surge protection. Each option compared on capex, response time, and effectiveness.

Sign-off + utility liaison

Report signed by a Chartered Engineer. If utility-side mitigation is recommended, we author the utility liaison letter quantifying the contract violation and engineering options for resolution.

Standards + compliance

Built to the standards your auditors quote

Reports reference the international and national standards your regulators, F500 audit teams, and corporate process safety leads cite. Every deliverable signed by a Chartered Engineer (CEng MIE India).

IEEE 519 · Harmonic Control in Electric Power Systems
IEC 61000-2-2 · Compatibility levels for low-frequency conducted disturbances
IEC 61000-4-30 · Power quality measurement methods (Class A)
EN 50160 · Voltage characteristics of electricity supplied by public distribution
IS 16100 (India) · Power Quality Standards · BIS

Anonymous case anchors

What this looks like in production

Three landmark engagements from our verified roster · quantified outcomes, no client names disclosed without written permission.

Pharma site, India · GMP cleanroom

Class-A capture isolated 30-cycle voltage sag from upstream utility as root cause of 14 batch failures in Q2. Engineered dynamic voltage restorer sized 800 kVA · batch failures fell from 14/quarter to zero.

Steel plant, USA · EAF furnace

Harmonic + flicker study under EAF operation. THD measured 11.4% at 33 kV PCC vs IEEE 519 limit 5%. Sized active filter + STATCOM combination · paid back in 14 months on demand charge reduction.

Data centre, UAE · Tier III

PQ audit before commissioning. Caught residual neutral current from triplen harmonics. Resized neutral conductor + grounded delta-wye transformer · pre-empted thermal failure in first summer.

Frequently asked

Power Quality Study · the practical questions

How long do you need to measure power quality?

A minimum of one continuous week covering at least one full production cycle, captured at the point of common coupling, the MCCs and the critical-load buses. Sites running weekly or campaign-based production need longer. Short spot checks routinely miss the events that caused the complaint in the first place.

What standards do you assess power quality against?

IEEE 519 for harmonic limits at the point of common coupling, IEC 61000-2-2 for compatibility levels and EN 50160 for supply voltage characteristics. Measurement is to IEC 61000-4-30 Class A, which is the instrument class utilities and regulators accept in a dispute.

My utility says my harmonics are too high. What do I do?

First establish whether the distortion originates on your side of the meter or is imported from the network, which needs simultaneous measurement at the connection point and at the suspected sources. The remedy differs entirely: detuned or active filtering for internal sources, and a technical and commercial case with the utility for imported distortion.

What causes voltage sags, and can they be prevented?

Most sags originate from faults elsewhere on the network rather than inside your plant, so they cannot be prevented, only ridden through. The engineering question is which loads must ride through and for how long, and that answer then sizes the ride-through hardware or UPS support.

Is a clamp meter enough, or do I need a Class A analyser?

For an argument with a utility or a regulator, only IEC 61000-4-30 Class A measurement is defensible. A clamp meter gives a snapshot; Class A logging captures the statistical distribution and the discrete events, which is what the limits in the standards are actually written around.

Scope your Power Quality Study engagement.

Tell us your plant, region, and scope · a named Chartered Engineer responds within 24 hours.

4 fields. No phone interview to start.
Per-discipline routing to the Power System Studies practice lead.
Anonymous case anchors sent with first reply.
Same-day callback for deadline-driven enquiries.

Power System Study Scoping

ETAP/DigSILENT/PSCAD-led · routes to Practice Lead PSS · 24-hour response.