Specialist Power Quality Analysers

Measuring voltage & current harmonics — Hull, Yorkshire & nationwide

Unexplained trips, hot transformers, flicker or equipment failures? SC Humber deploys class-leading power quality analysers to capture voltage and current harmonics, interharmonics, flicker and notching—giving you clear, actionable data. We survey, diagnose and report against today’s UK standards (EREC G55, which replaced G54-1) so you can evidence compliance and plan effective remediation. TNEI+1

Based in Hull and Yorkshire, delivering across the UK.

What we measure

Harmonics & interharmonics (to the 100th order)

• Individual voltage harmonics, THDv, interharmonics and sub-groups (per EREC G55)
• Current harmonics on key feeders and plant
• Notching capture for converter/drive heavy sites - G55 extended harmonic assessment from the 50th to the 100th order, aligning measurement methods with IEC practice. outramresearch.co.uk+1

Flicker, dips & swells

• Short/long-term flicker indices (Pst/Plt)
• Voltage dips, swells and rapid changes (for connection studies alongside P28/P29 where relevant). National Grid

Power factor, unbalance & loading

• kW, kVAR, kVA and power factor trends
• Negative sequence/unbalance and transformer loading

G55, G54-1 (sometimes written “G54/G53”) — what we test against

• EREC G55 (June 2020) is the current UK recommendation for harmonic voltage distortion and the connection of harmonic or resonant plant. It defines planning/compatibility limits and a staged assessment process. dcode.org.uk+1
• G55 supersedes G54-1 (the older guideline many still reference as “G54”). Our reports can be aligned to either format if required by a DNO or legacy specification. ena-eng.org
• In practice, network operators and consultants now expect measurements up to the 100th harmonic, plus interharmonics and notch waveform capture—exactly what our analysers record. outramresearch.co.uk

How better power quality cuts costs

• Fewer trips & failures: Harmonics and notching overstress protection devices, drives and capacitors; fixing the cause reduces downtime and callouts.
• Lower losses: Distorted currents increase I²R losses—cleaner power means cooler cables/transformers and lower waste.
• Right-sized mitigation: With accurate data, we specify only what you need—detuned PFC, passive/active filters or control changes—backed by before/after evidence.
• Smoother DNO approvals: A compliant G55 dataset speeds connection or upgrade approvals for new drives, heat pumps, EV charging and onsite generation. TNEI

Deliverables you’ll receive

• Power quality report with trends, spectra and clear explanations
• G55 compliance summary (and G54-1 mapping if requested)
• Prioritised actions:quick fixes, operational tweaks, and engineered solutions
• ROI pointers where filtering/PFC unlocks demand headroom or removes reactive charges (paired with our PFC service if needed)

Typical use cases

• New process lines, VFD/VSD rollouts, heat pumps and chiller plants
• EV charging hubs and depot electrification
• Nuisance tripping, overheating boards or capacitor bank failures
• DNO connection studies (Stage 1–3) needing background harmonic data dcode.org.uk

Sectors we support

Manufacturing & process • Cold storage & logistics • Commercial estates • Healthcare • Education & public sector • EV depots & fleets • Food & beverage