Power system studies · India and international projects
Harmonic Analysis Study Services in India.
Understand harmonic distortion before adding nonlinear loads or selecting corrective equipment. Elegrow Technology supports harmonic and power-quality assessments for proposed networks and operating facilities, with measurements and modelling defined around the project question.
What is a harmonic analysis study?
A harmonic analysis study evaluates voltage and current distortion associated with nonlinear loads and the network through which harmonic currents flow. It can assess existing conditions, proposed changes and mitigation options. The useful result connects the source assumptions, network configurations and assessment locations to a defined engineering decision.
A drive expansion, UPS installation, inverter connection or capacitor-bank change can require a different assessment from an investigation of existing disturbances. Harmonics are one part of power quality; voltage dips, switching transients and other events may require a different measurement or study scope.
Start with the engineering decision.
Design and expansion
Assess proposed nonlinear loads using available manufacturer spectra, network information and operating cases.
Operating problems
Define the symptoms and measurement locations before deciding whether harmonics explain the reported issue.
Mitigation decisions
Compare agreed network or filter options, including relevant resonance and equipment constraints.
What information is needed for harmonic analysis?
Network and equipment
- Current single-line diagram, sources, transformers and cable data.
- Drive, rectifier, UPS and inverter details with available harmonic spectra.
- Capacitor-bank, reactor and existing filter information.
- Utility connection data and the agreed assessment locations.
Operating evidence
- Load schedules and relevant combinations of equipment in service.
- Available power-quality records, including measurement locations and instrument settings.
- Operating logs and timing of reported symptoms.
- Planned changes, acceptance criteria and any utility-specific requirements.
Share the records available. Missing inputs, site work, delivery dates and any additional assessment should be agreed before the programme is confirmed.
Open the Power System Study Input ChecklistHow we structure the assessment.
- Define the question: Separate a planned-design assessment from an existing-site investigation and agree the assessment points.
- Review evidence: Check available equipment data, measurements and their operating context.
- Assess the cases: Model the agreed harmonic sources and network arrangements; include frequency scans where needed.
- Evaluate options: Compare relevant mitigation cases and report residual constraints and verification needs.
What should the report contain?
- A defined scope, input register, operating cases and documented assumptions.
- Voltage/current distortion results at agreed locations and frequencies.
- Resonance assessment or mitigation comparisons where included in the scope.
- Recommendations, limitations and a plan for further measurements or post-installation checks where needed.
A simulation is not a site measurement. For an existing facility, representative measurements can help establish the baseline and test model assumptions. A single snapshot may miss operating changes. Filter selection should account for the assessed network; an unexamined capacitor-bank addition can interact with network resonance.
Published power-quality project context.
The published Power Quality Assessment at a Dual-Source 33 kV API Facility describes an investigation across two incoming supplies. It provides context for a project-specific power-quality assessment; it is not evidence that every reported disturbance is caused by harmonics.
India first, with international delivery.
Supporting projects in India, Africa, Australia and other international markets. Applicable local requirements, delivery arrangements and any site support are confirmed for the agreed scope.
Questions before commissioning a study.
Can a power factor correction bank solve a harmonic problem?
It should not be assumed to do so. Capacitors can interact with the network and amplify certain harmonics through resonance. Assess the proposed arrangement and any detuning or filtering requirements before selection.
What is the difference between harmonic analysis and power-quality monitoring?
Monitoring records electrical conditions at selected locations over a defined period. Harmonic analysis interprets distortion and can model proposed cases or mitigation. Monitoring may also capture non-harmonic events that require separate investigation.
Is 5% THD a universal pass/fail rule?
No. Assessment depends on the metric, voltage level, assessment point, applicable standard or utility requirements and operating context. Voltage distortion and current distortion must not be treated as the same criterion.
Can the work support projects outside India?
Yes. India is the primary market, with support for Africa, Australia and other international projects subject to the agreed scope, local requirements and delivery arrangements. Site measurements and access should be confirmed separately.
