Individual Studies Available
While we specialise in complete G99 compliance packages, we also offer individual power system studies for projects where specific analysis is needed. This includes:
- Projects with partial study packages requiring gap-fill analysis
- Industrial and commercial power systems outside G99 scope
- Due diligence and technical review for project acquisitions
- Design verification and independent checking
- Troubleshooting and problem investigation
All studies are completed using industry-standard tools, primarily DIgSILENT PowerFactory, and delivered as comprehensive technical reports suitable for DNO submission or internal use.
Available Studies
Load Flow Analysis
Steady-state power flow calculations to determine reactive power capability and verify compliance with DNO active/reactive power (PQ/UQ) requirements.
Short Circuit Studies
Fault level calculations to determine equipment ratings, protection device selection, and network fault contribution from connected generation.
Protection Coordination
Grading studies to ensure correct fault detection, discrimination, and clearance times across protection devices from generation to grid interface.
P28 Voltage Assessment
Analysis of voltage fluctuations caused by generation output changes per ENA Engineering Recommendation P28.
G5/5 Harmonic Studies
Harmonic distortion analysis per ENA Engineering Recommendation G5/5 including emission limits and filter design recommendations.
Dynamic Stability
Time-domain simulations assessing transient response to network disturbances, fault ride-through, and control system performance.
Reactive Power Studies
Assessment of reactive power capability, voltage control performance, and compliance with Grid Code reactive requirements.
Earthing and Step/Touch
Earthing grid performance, rise of earth potential and step and touch voltages against the limits in EN 50522 and ENA TS 41-24.
Arc Flash
Incident energy, arc flash boundary and PPE category to IEEE 1584 or NFPA 70E, calculated off the same network model as the protection study, with the label data exported ready to print and a report on what to do about it. G99 does not require it, but EPCs and developers increasingly ask for it alongside the connection package.
Software & Tools
We use industry-standard software accepted by UK DNOs and network operators.
Cable rating and thermal calculations run on our own software, maintained in step with the IEC standards, which is what makes the turnaround fast. See cable system design.
Frequently Asked Questions
Can I commission individual studies rather than a full package?
Yes. While we offer complete G99 packages, individual studies are available when you need specific analysis only. This is common for projects with partial study packages from other consultants, or for non-G99 applications.
What software do you use?
We primarily use DIgSILENT PowerFactory for power system analysis, which is widely accepted by UK DNOs. We also use specialist tools for cable sizing, protection coordination, and harmonic analysis as required.
Do you work on industrial power systems?
Yes. Grid connections for renewable generation are the bulk of it, but industrial power systems are a lane in their own right: load flow, short circuit, protection coordination and relay settings for factories, refurbishments and sites with no current settings schedule.
Do you do arc flash?
Yes. Incident energy, the arc flash boundary and the PPE category come off the same network model as the protection study, to IEEE 1584 or NFPA 70E, with the label data exported ready to merge and print and a report setting out what we recommend doing about it. Because the model is already built for the grading, arc flash is a small step rather than a new project, which is why it usually sits inside a connection or protection package. Two things we do not do. Site inspection, so the equipment data has to come from you or from a survey carried out by someone else. And training. Both are specialist work in their own right and we will say so rather than stretch to cover them.
Can you review or verify studies completed by others?
Yes. We provide independent technical review services for studies completed by other consultants or in-house teams. This is common for due diligence, project acquisition, or quality assurance purposes.
Discuss Your Study Requirements
Tell us about your project and the studies you need. We'll confirm scope and provide a fee proposal.