Power System Studies & Simulation.
Power system studies for new projects and operating assets. We assess load flow, short circuit, protection coordination, arc flash, power quality and grid integration against the agreed project basis, helping your team make decisions during planning, design, commissioning and operation.
Supporting projects in India, Africa, Australia and other international markets. Local requirements, delivery arrangements and any site support are confirmed for the agreed scope.
Explore Global DeliveryEngineering Scope.
Twelve studies. Each one answers a single question, before equipment is bought.
Short Circuit
What fault duties must the agreed equipment-rating checks assess?
Explore short circuit studiesRelay Coordination
Will protection isolate a fault fast, and only where it should?
Explore relay coordinationEarthing
Is the site safe for people during an earth fault?
Harmonics & Power Quality
How do nonlinear loads and network conditions affect distortion and resonance?
Explore harmonic analysisTransient Studies
What happens in the milliseconds after a switch, fault or strike?
Insulation Coordination
Are insulation levels and arresters right for the overvoltages?
Explore insulation coordinationMotor Starting
Will large motors start without pulling the voltage down?
Grid Code Compliance
Will the utility approve the connection first time?
Battery Sizing
How much storage, at what power and for how long?
Microgrid Simulation
Does the system stay stable once it separates from the grid?
Also available: contingency and reliability, dynamic RMS simulation, stray current, traction harmonics, EV charging load impact, and N+1 / 2N redundancy for critical facilities.
At Each Project Stage.
Where you are in the Project decides what you need from us.
Feasibility & Concept
Validate viability and size the system before capital is committed.
- Load flow and network performance
- Renewable and BESS grid integration feasibility
- Techno-economic sizing basis
Detailed Design
Set the ratings and settings the whole design depends on.
- Short circuit and protection coordination
- Arc flash hazard analysis
- Insulation coordination and transients
- Harmonic and grid code compliance
Tender & Procurement
Confirm equipment ratings match the studies before you order.
- Equipment rating verification against study results
- Technical bid review
Construction
Studies are frozen; site queries reference them, not repeat them.
- Design-basis clarifications
- Settings confirmed for panel and relay ordering
Pre-Commissioning & Commissioning
Prove the settings on the real network before energisation.
- Relay setting verification support
- As-built model reconciliation
Operation & Maintenance
Re-study as the network, load or standard changes.
- Arc flash re-study, typically every 5 years
- Studies for retrofits, expansions or new loads
- Harmonics and power quality troubleshooting
Proof in Practice · Pharma · Power Quality
Resolving Power Quality Challenges in a Dual-Source 33 kV API Facility
Diagnosing and fixing power quality problems in an API plant supplied from two 33 kV sources.
- Sector
- Industrial & Process Plants
- Year
- 2025
Which power system study do you need?
Start with the decision: normal network performance, fault duty, protection, arc-flash exposure, overvoltages or harmonic distortion. More than one study may be needed; agree the cases and interfaces before work begins.
On a small screen, scroll the comparison horizontally. Keyboard users can focus the table area and use the arrow keys.
| Study | Main engineering question | What to keep separate |
|---|---|---|
| Load flow | Voltage, loading and power flows in defined operating cases. | It does not establish fault duty or protection selectivity. |
| Short circuit | Prospective fault currents and the agreed equipment-duty checks. | It does not by itself provide relay coordination or arc-flash labels. |
| Relay coordination | Protective-device responses and settings for relevant fault conditions. | Settings recommendations need implementation and appropriate testing. |
| Arc flash | Incident energy and boundaries for the agreed equipment, cases and method. | It does not remove the hazard or replace an electrical safety programme. |
| Insulation coordination | Insulation levels and protective arrangements against relevant overvoltages. | It is distinct from a routine insulation-resistance test. |
| Harmonic analysis | Distortion, network resonance and agreed mitigation cases. | It does not explain every power-quality disturbance. |
The studies should use a consistent network basis where their scopes overlap. For example, fault-study results can inform a protection review, and the relevant clearing times can inform an arc-flash assessment. One report title does not imply that every discipline or operating case is included.
See how the study scopes connect in practice.
Network and protection review
The published distribution-system case describes network modelling, load-flow and short-circuit studies within a relay-coordination review.
Read the distribution-system case studyPower-quality investigation
The published dual-source API-facility case describes an investigation across two incoming supplies, with findings used to guide plant-specific corrective measures.
Read the power-quality case studyThese published examples provide project context, not a guarantee for another installation. Client identities and confidential material are not disclosed here.
How We Work on It.
The method behind every engagement. The detail is set out in the proposal and the design basis.
Inputs and Deliverables.
A practical starting point and the Engineering outputs to agree for your Project.
What We Need from You
- Single-line diagram
- Equipment data: transformers, cables, generators, motors, protection
- Utility fault levels and connection requirements
- Load, generation and operating scenarios
- The standard or grid code the study must meet
Send what is available. We will identify missing information before confirming the scope and programme.
What You Receive.
- Study report with assumptions, cases, results and recommendations
- Protection setting schedules
- Arc flash results and mitigation plan
- Harmonic filter design, where needed
- Grid code compliance results
- Study models, on request
The exact deliverables are fixed in the agreed scope for each Project.
Standards and Compliance.
We engineer to the standards and regulations that govern your Project, fixed in the design basis.
Typical references for this Service: IEC 60909, IEEE 1584, IEEE 80, IEEE 519, IEC 60071.
Applicable standards and editions are agreed and fixed in each Project's design basis.
How We Assure the Work
Questions Clients Ask.
What is the difference between load flow, short-circuit and relay coordination studies?
Load flow assesses steady-state voltages, equipment loading and power flows for defined operating cases. A short-circuit study assesses fault conditions and the resulting duties. Relay coordination evaluates protective-device operation against those fault cases and the agreed protection criteria. The studies answer different questions and may be combined in one appointment.
Explore load flow analysis →What information is needed for a relay coordination study?
Start with the single-line diagram, network configurations, available fault-level data, equipment records and current relay settings. Relay models and functions, CT/VT information, breaker operating data, utility criteria and trip or test records may also be needed. The scope should identify missing inputs and define which protection functions and cases will be assessed.
Explore relay coordination →Prepare your study inputs →What is coordinated in an insulation coordination study?
The assessment considers equipment insulation withstand levels in relation to the overvoltages and protective measures relevant to the installation. The network, equipment ratings, surge arrester application and relevant operating cases form part of the study basis. The applicable method and acceptance criteria are established for the project.
Explore insulation coordination →Is an engineering study the same as site testing and commissioning?
No. A study evaluates the defined system using documented inputs, assumptions and assessment cases. Site testing and commissioning verify specified equipment and scheme behaviour through an agreed procedure. Settings implementation, testing and commissioning should be explicitly included where required; a study report alone does not prove that a site change has been applied or tested.
Explore testing and commissioning →What information is needed to start a power system study?
Share the available single-line diagram, equipment and protection data, utility or source information, load and generation scenarios, and applicable project requirements. Send what is available; missing information can be identified before the scope and programme are confirmed.
Open the Power System Study Input Checklist →What deliverables will a power system study include?
The agreed scope defines the deliverables. These can include a report with assumptions, operating cases, results and recommendations, together with relevant protection schedules, arc flash results, mitigation recommendations or other study-specific outputs. Model handover and additional support should be agreed in the proposal.
Do you support projects in India and overseas?
ETPL is based in Surat, Gujarat, with India as its primary market. We also welcome engineering project enquiries from Africa, Australia and other international markets. Applicable local requirements, client specifications, delivery arrangements and any site support are confirmed for each project.
Explore Global Delivery →Which studies do you carry out?
Load flow including time-series load flow, short circuit, relay coordination, arc flash, harmonics, transient stability and electromagnetic transients, insulation coordination, grid code compliance, battery sizing, microgrid simulation, earthing and motor starting.
Can you prepare grid connection studies?
Yes, renewable and BESS integration and grid code compliance studies for the connecting utility.
Can you study an existing plant?
Yes. Arc flash, protection and harmonic studies are often the first step to a safer plant.
Read more: Power Quality Audits: Reading Harmonics, Sags and Flicker →Can you review another consultant's study?
Yes, as Owner's or Independent Engineer, but not where we are also the Detailed Engineer.
Read more: Owner's Engineer or Detailed Engineer: Which Appointment Do You Need? →Where This Service Applies.
This Service appears in the scope of 6 Sectors. Select a Stage to see the full scope for that Sector.
This Service in Practice.
Selected engagements, described without confidential details.
From Our Engineers.
Practical engineering notes related to this page.
