Services
We Offer a Range of Power System Services to Meet Your Needs
Our consultancy offers a comprehensive range of power system services designed to optimize safety, performance, and regulatory compliance. We specialize in earthing surveys & designs, Our condition monitoring services help track the health of critical infrastructure, allowing for proactive maintenance and minimizing downtime.
Compliance Studies
For all embedded generators connected to the DNO networks it is necessary to meet the requirements of the ENA G99 standard. This standard details various performance requirements for generators depending on their rating (in MW) and connection voltage. These studies are, split into four main categories, as shown below. Type A Generators (1MW and 10MW and 50MW and/or connected at 110kV and above), are more or less identical to Type C generators.  Type B studies are quick and easy to do and can be done in under a week – assuming all the information is readily available and an engineer is free. Type C/D studies are practically identical, but are a little harder to complete as they require more extensive dynamic modelling of the inverter and the PPC. The key to all the studies and simplifying the approval process, is starting early and good data handover. For all embedded generators connected to the DNO networks it is necessary to meet the requirements of the ENA G99 standard. This standard details various performance requirements for generators depending on their rating (in MW) and connection voltage. These studies are, split into four main categories, as shown below. Type A Generators (1MW and 10MW and 50MW and/or connected at 110kV and above), are more or less identical to Type C generators.  Type B studies are quick and easy to do and can be done in under a week – assuming all the information is readily available and an engineer is free. Type C/D studies are practically identical, but are a little harder to complete as they require more extensive dynamic modelling of the inverter and the PPC. The key to all the studies and simplifying the approval process, is starting early and good data handover.
For all embedded generators connected to the DNO networks it is necessary to meet the requirements of the ENA G99 standard. This standard details various performance requirements for generators depending on their rating (in MW) and connection voltage. These studies are, split into four main categories, as shown below.​
Type A Generators (<1MW) do not require any special analysis;
Type B Generators (>1MW and <10MW) which require a Fault Ride Through (FRT) study, Limited Frequency Sensitive – Over (LFSM-O) study, and a basic reactive power flow study.
Type C Generators (>10MW and <50MW), that require a full spread of studies including Reactive Power Flow, Reactive Power Stability, FRT, LFSM-O, LFSM-U and FSM-O.
Type D Generators (>50MW and/or connected at 110kV and above), are more or less identical to Type C generators. Type B studies are quick and easy to do and can be done in under a week – assuming all the information is readily available and an engineer is free. Type C/D studies are practically identical, but are a little harder to complete as they require more extensive dynamic modelling of the inverter and the PPC. The key to all the studies and simplifying the approval process, is starting early and good data handover.
Earthing Studies
Earth Potential Rise and Touch and Step Voltage Calculations Earthing and grounding studies are an essential design requirement for all new HV / EHV electrical systems. These studies are carried out to ENA 41-24, BS En 50522 and sometimes to IEEE-80, and are used to assess the Earth Potential Rise (EPR) and the associated touch and step voltages of a site. Power system earthing is a complex, iterative design process which needs to determine the soil resistivity, DNO fault levels and metallic return paths back to the upstream source substations. These studies are carried out in either CDEGS or XGSLab allowing creation of complex site models containing localized soil volumes and induced voltages on below ground and above ground systems.
Earthing Designs
Earthing System Design at Grid Labs Earthing and grounding studies are a critical design requirement for all new HV and EHV electrical systems, playing a key role in ensuring safety and system integrity. At Grid Labs, we specialize in delivering complete, compliant, and cost-effective earthing designs tailored to each project's site-specific conditions. Our designs adhere to key standards such as ENA 41-24, BS EN 50522, IEEE-80, IEC 62305, ENA S34, and BS 7430, ensuring that all systems meet regulatory and operational safety requirements. Using advanced software tools like CDEGS and XGSLab, we model complex site conditions, including localized soil volumes, metallic return paths, and induced voltages on both underground and above-ground systems. Our earthing studies accurately assess Earth Potential Rise (EPR) and associated touch and step voltages, helping to determine whether a site is classified as Cold or Hot. Power system earthing is inherently complex and requires an iterative approach. We begin by determining key inputs such as soil resistivity, DNO fault levels, and the presence of metallic return paths to the upstream substations. From there, we optimize conductor sizing and earth nest layouts to ensure safety and efficiency while minimizing costs. Our comprehensive services include: Calculation of EPR and safe touch/step voltages Generation of 3D voltage contour plots Optimized rod and conductor layouts based on geotechnical and electrical data Design of exclusion zones for sensitive areas Transferred potential mitigation Seamless integration with lightning protection systems With deep domain expertise and a collaborative team approach, Grid Labs delivers robust earthing solutions that ensure personnel, equipment, and environments remain fully protected under all operating conditions.
Substation Lightning System Designs
Lightning Risk Assessments and Protection Design at Grid Labs At Grid Labs, we conduct detailed lightning risk assessments in accordance with IEC 62305, the globally recognized standard for lightning protection. These assessments are used to determine both the probability of a lightning strike and the potential consequences to a site or asset. When the risk is deemed non-negligible, we design and recommend appropriate lightning protection systems—ranging from basic air terminals and down conductors to more advanced solutions such as lightning masts and overhead shield wires. Our designs employ internationally accepted techniques including the Rolling Sphere Method, Cone of Protection, and Protective Angle Method, all in alignment with IEEE Std 998, which is particularly relevant for substation shielding. In addition, LEMP (Lightning Electromagnetic Impulse) protection is evaluated—especially for low-voltage systems—to ensure internal equipment is safeguarded using appropriate Surge Protection Devices (SPDs), in line with IEC 62305-4 and IEEE Std 1410 for distribution-level systems. For transmission lines, we follow IEEE Std 1243, which provides best practices for improving lightning performance through shielding and tower grounding. Where necessary, we also reference IEC 60071 for insulation coordination to ensure compatibility between surge arresters and system withstand levels. It is important to note that while lightning risk assessments and protection designs address external and internal protection, they are not the same as insulation coordination or lightning impulse studies, which fall under system-specific transient analysis. At Grid Labs, all assessments and designs are performed in accordance with applicable standards, including: IEC 62305 Parts 1–4 (risk management, physical protection, LEMP) IEEE Std 998 (substation shielding) IEEE Std 1243 (transmission line protection) IEEE Std 1410 (distribution line protection) IEC/BS EN 60071 (insulation coordination) BS EN 62305 (UK/EU adaptation of IEC 62305) Our team ensures every solution is tailored to the site-specific risk, delivering safe, reliable, and standards-compliant lightning protection
Earthing Tests & Surveys
Earthing Surveys and Testing at Grid Labs At Grid Labs, we offer comprehensive earthing surveys and testing services for all types of power systems to ensure the integrity and performance of installed earthing systems. Our goal is to verify that the earthing system is correctly installed, adequately rated for the required duty, and performing as designed—providing safety for personnel, equipment, and the surrounding environment. Our surveys typically begin with visual inspections of all accessible conductors, joints, and earth rods. This is followed by micro-ohmmeter testing to measure the resistance of connections and earth clamp meter testing to assess individual rod performance. We carry out soil resistivity surveys and Fall of Potential (FoP) tests to evaluate the underlying soil characteristics and validate the overall performance of the earthing system. Once an earthing system has been installed, we validate our designs and confirm that the actual earth grid impedance aligns with the values predicted in modelling software such as CDEGS or XGSLab. Our soil resistivity testing is typically carried out using the Wenner 4-pin method at multiple site locations, with electrode spacings in accordance with BS EN 50522. This provides a detailed understanding of the subsurface soil structure, which is crucial not only for validating existing systems but also for informing future upgrades or expansions. Whether validating an existing earthing system or troubleshooting site-specific grounding issues, our experienced engineers ensure all tests are performed with accuracy, safety, and full compliance with industry standards
Protection Design & Settings Coordination
Correct protection settings of relays are of vital importance to any electrical system, as it ensures that should a fault occur, only the faulted item of equipment is removed form service, and the healthy equipment is kept on line. If the protection study has not been coordinated correctly and there is insufficient grading margin, a simple LV fault can trip a whole HV substation. Aurora has experience of undertaking a wide range of protection grading studies from simple over current earth fault coordination studies for a Ring Main Unit, up to configuring complex differential protection schemes and investigating nuisance protection trips. Protection studies can be carried out using either ETAP or DIgSILENT software package. These packages allow overall grading to be carried out, but also check of response to system disturbances, through simulation of faults on any part of the network to confirm the exact operating sequence and times for the protective devices
Protection Coordination Studies
Protection Studies and Relay Coordination at Grid Labs At Grid Labs, we carry out detailed protection studies and relay coordination to ensure electrical systems operate safely and reliably under fault conditions. Correctly configured protection settings are essential—they ensure that when a fault occurs, only the affected equipment is isolated while the rest of the system remains in service. Poor coordination or insufficient grading margins can result in widespread outages, such as a low-voltage fault tripping an entire high-voltage substation. Our team has extensive experience conducting a wide range of protection grading studies—from basic overcurrent and earth fault coordination for Ring Main Units (RMUs) to advanced differential protection schemes, and the diagnosis of nuisance protection trips. We work with protection relays from leading manufacturers including ABB, SEL (Schweitzer Engineering Laboratories), Siemens, Eaton and Schneider, ensuring compatibility and precise implementation across diverse system architectures. Protection studies are performed using industry-standard software tools such as ETAP and DIgSILENT PowerFactory, which allow us to model entire networks, apply fault conditions, and simulate the exact operating sequence and clearing times of protective devices. These platforms also support setting coordination, ensuring proper grading between relays and confirming that protection devices operate in the correct order during system disturbances. Our services include: Relay settings coordination and validation Grading margin assessments to avoid maloperation Simulation of faults across different network points Coordination of primary and backup protection schemes Configuration and testing of differential, distance, overcurrent, and earth fault protection Detailed reports outlining operating times, selectivity, and recommendations for relay settings At Grid Labs, our approach ensures protection systems are not only technically sound, but also fully aligned with operational requirements and vendor-specific capabilities.
Protection Systems Design
At Grid Labs, we provide complete protection system design services for electrical networks ranging from MV to EHV levels. Our work ensures the safe, selective, and reliable isolation of faults to maintain system stability and equipment integrity. From initial concept through to construction-ready documentation, our team delivers detailed, technically sound, and standards-compliant designs tailored to each client’s infrastructure and operational needs. We begin by developing equipment specifications for protection relays, CTs, VTs, circuit breakers, and auxiliary components—ensuring compatibility with existing systems and alignment with project requirements. We work with trusted vendors including SEL, ABB, Siemens, GE, and Schneider Electric, allowing us to recommend and configure best-in-class protection devices across diverse system architectures. Our engineers prepare comprehensive protection and control drawings, including: Single line diagrams Protection logic and scheme diagrams Wiring and termination diagrams Relay configuration and I/O maps Panel layout and interconnection drawings We also provide detailed material take-offs and quantification, supporting procurement and construction planning. All protective devices are carefully selected and coordinated, with settings developed to match fault levels, equipment withstand ratings, and operational requirements. This includes the configuration of: Overcurrent and earth fault protection Distance and differential schemes Busbar, transformer, feeder, and motor protection Breaker failure, autoreclose, and intertripping schemes Each design is validated through protection studies and simulations using ETAP or DIgSILENT PowerFactory, ensuring relay settings are coordinated and system behavior under fault conditions is fully verified. Our scope often includes integration with SCADA, RTUs, and communication protocols (e.g., IEC 61850, DNP3, Modbus), ensuring full visibility and control of the protection system. Whether supporting greenfield substations or brownfield retrofit projects, Grid Labs delivers protection system designs that are practical, robust, and installation-ready, with complete documentation, clear protection philosophy, and field-tested engineering practices.
Power Quality
Harmonic analysis is carried out to identify the level of harmonic distortion on a network, that contains harmonic polluting sources, such as inverters and variable speed drives. The analysis is carried out to standard such as ENA G5.5, ENA G5.4, IEC 61000-3 and IEEE-519, and are used to determine individual levels of voltage and current harmonic distortion and the Total Harmonic Distortion (THD) on key busbars and identify any resonance points. Use and generation of harmonic impedance loci can sometimes be beneficial for these studies, but in other scenarios can lead to overly conservative results and unnecessary harmonic filters. It is important to note that traditional ENA G5.4 and ENA G5.5 studies only assess the harmonics at the point of connection / common coupling, and it is often beneficial to extend the scope to consider the actual distortion levels on other key busbars within the system. Studies are usually carried out in DIgSILENT Powerfactory or ETAP using a simplified balanced loadflow method, but it is also possible to carry out unbalanced analysis, to consider harmonic cancellation and the behaviour in the positive negative and zero sequence networks. In some very advanced cases it is also possible to use EMT analysis to identify the true level of harmonics in the network.
Harmonic Studies
At Grid Labs, we perform in-depth harmonic analysis to assess the level of harmonic distortion on electrical networks, especially in systems with harmonic-generating sources like inverters, variable speed drives (VSDs), and other non-linear loads. Harmonics can cause system instability, overheating of equipment, and interference with sensitive devices, which is why accurate analysis and mitigation are crucial. Our harmonic studies follow established international standards such as ENA G5.5, ENA G5.4, IEC 61000-3, and IEEE-519, to evaluate both voltage and current harmonic distortion. We focus on key parameters such as the Total Harmonic Distortion (THD) at critical busbars and identify potential resonance points that may amplify harmonic effects. These analyses help determine whether mitigation measures, such as harmonic filters, are required to maintain system integrity and compliance with regulatory limits. ​ Traditional ENA G5.4 and ENA G5.5 studies typically focus on harmonic levels at the point of common coupling (PCC). However, we extend our studies to evaluate harmonic distortion on other key busbars and system nodes to provide a more comprehensive view of network performance and ensure system-wide compliance. Our harmonic analysis is performed using industry-leading software tools such as DIgSILENT PowerFactory and ETAP, utilizing a simplified balanced load flow method for typical scenarios. For more complex networks, we conduct unbalanced harmonic analysis to assess the behavior of harmonics across positive, negative, and zero sequence networks. In advanced cases, we may also employ Electromagnetic Transients (EMT) analysis to accurately capture the true harmonic behavior of the network and understand the transient impacts of harmonic distortion. At Grid Labs, we provide actionable insights into harmonic mitigation, ensuring that systems are not only compliant but also optimized for performance, efficiency, and longevity.
Voltage Unbalance Studies
At Grid Labs, we perform detailed voltage unbalance studies as part of our comprehensive electrical network analysis services.We conduct voltage unbalance studies in compliance with standards such as ENA P28 and ENA P29, which focus on voltage disturbances and unbalance analysis. These studies help assess the potential impacts of unbalanced loads on system performance, equipment lifespan, and network stability. For more complex networks or where greater accuracy is required, we also perform unbalanced harmonic load flow studies to evaluate the effect of unbalance on both voltage and current harmonics. These studies are carried out using tools like DIgSILENT PowerFactory and ETAP, ensuring reliable results in line with industry standards. In addition to voltage unbalance, our team routinely carries out IEC 61000-3-6 analysis to evaluate the effects of harmonic distortion on the network, ensuring compliance with international standards such as IEEE-519. We also consider BESS (Battery Energy Storage Systems) power swing and ramp rate limitations, as well as perform Grid Code RVC/SVC analysis to evaluate the interaction between voltage and reactive power. At Grid Labs, we ensure all systems, whether low-voltage, high-voltage, or renewable energy, are fully analyzed for voltage unbalance and harmonic issues. Our thorough analysis and mitigation strategies ensure compliance, minimize the risk of equipment damage, and enhance overall system efficiency and performance
Cable Systems Design & Service
A safe, reliable, and efficient electrical system depends heavily on the quality of its cable infrastructure—from the initial design through to installation, termination, and ongoing maintenance. Gridlabs offers a comprehensive suite of LV and HV cable engineering services that ensure every aspect of the cable system is designed and executed to the highest technical and safety standards. Whether supporting new construction, network upgrades, or fault rectification, our team brings a practical, standards-driven approach backed by extensive field experience and the latest software tools. The following sections outline key areas of our cable engineering expertise:
Cable System Design
Cable system design is a critical element of any electrical network, ensuring that power is transmitted safely, efficiently, and within regulatory compliance. Poorly specified cable sizes or routes can lead to excessive voltage drops, overheating, and premature equipment failure. Aurora has experience in designing LV and HV cable systems for a range of applications, from industrial sites to large infrastructure projects. Designs consider load capacity, thermal ratings, short circuit withstand, and electromagnetic compatibility, as well as environmental and installation conditions. Detailed cable sizing and voltage drop calculations are carried out using software such as ETAP or CYMCAP to ensure compliance with BS7671, IEC, and client-specific standards.
Raceway System Design
Raceway systems—including cable trays, trunking, and conduit layouts—form the structural backbone for secure and maintainable cable installations. A well-designed raceway system ensures mechanical protection, ease of maintenance, and future expandability. Aurora offers full raceway system design services, from concept layout to detailed construction drawings. This includes cable routing plans, load calculations for tray fill ratios, and separation requirements for power and data services. Designs are developed in CAD or BIM platforms such as AutoCAD and Revit, integrating with wider building services and considering site-specific constraints like space limitations and environmental exposures
Cable Installation, Termination & Fault Rectification
The reliability and performance of any electrical network depend not just on the quality of its design, but on the precision and integrity of its installation and maintenance. Gridlabs provides end-to-end services for LV and HV cable installation, termination, and fault rectification—ensuring long-term safety, compliance, and operational uptime. Our installation services cover the full lifecycle of cable deployment, including pulling calculations, route verification, mechanical protection, and final dressing. We ensure all work is carried out in accordance with IET Wiring Regulations, DNO standards, and manufacturer specifications. Whether installing new infrastructure or upgrading existing assets, Gridlabs delivers to the highest standards of workmanship and documentation. Terminations are executed by trained and authorised personnel using approved cold-shrink, heat-shrink, or resin systems. Attention is given to insulation integrity, stress control, and partial discharge mitigation to ensure long-term serviceability. We employ advanced testing tools—including insulation resistance, VLF, and partial discharge detection—to verify the performance of every termination. In the event of a fault, Gridlabs offers rapid-response diagnostics and repair. Our engineers use techniques such as Time Domain Reflectometry (TDR), thump testing, and fault loop impedance testing to accurately locate faults with minimal disruption. Once identified, the damaged sections are repaired or replaced, and the root cause is addressed to prevent recurrence. Our structured fault response process ensures safe restoration of service and improved resilience going forward with works ranging from MV to EHV levels. Our work ensures the safe, selective, and reliable isolation of faults to maintain system stability and equipment integrity. From initial concept through to construction-ready documentation, our team delivers detailed, technically sound, and standards-compliant designs tailored to each client’s infrastructure and operational needs. We begin by developing equipment specifications for protection relays, CTs, VTs, circuit breakers, and auxiliary components—ensuring compatibility with existing systems and alignment with project requirements. We work with trusted vendors including SEL, ABB, Siemens, GE, and Schneider Electric, allowing us to recommend and configure best-in-class protection devices across diverse system architectures. Our engineers prepare comprehensive protection and control drawings, including: Single line diagrams Protection logic and scheme diagrams Wiring and termination diagrams Relay configuration and I/O maps Panel layout and interconnection drawings We also provide detailed material take-offs and quantification, supporting procurement and construction planning. All protective devices are carefully selected and coordinated, with settings developed to match fault levels, equipment withstand ratings, and operational requirements. This includes the configuration of: Overcurrent and earth fault protection Distance and differential schemes Busbar, transformer, feeder, and motor protection Breaker failure, auto-reclose, and intertripping schemes Each design is validated through protection studies and simulations using ETAP or DIgSILENT PowerFactory, ensuring relay settings are coordinated and system behavior under fault conditions is fully verified. Our scope often includes integration with SCADA, RTUs, and communication protocols (e.g., IEC 61850, DNP3, Modbus), ensuring full visibility and control of the protection system. Whether supporting greenfield substations or brownfield retrofit projects, Grid Labs delivers protection system designs that are practical, robust, and installation-ready, with complete documentation, clear protection philosophy, and field-tested engineering practices.
PAT Testing
A safe workplace and legally compliant electrical environment rely heavily on the regular inspection and testing of portable appliances. Gridlabs offers professional PAT (Portable Appliance Testing) services designed to ensure that all portable electrical equipment operates safely and meets UK Health and Safety regulations. Our qualified engineers apply a methodical, risk-based approach to identify potential hazards, verify insulation integrity, and assess earth continuity across a wide range of appliances. Whether supporting commercial offices, industrial facilities, or construction sites, we deliver detailed reporting and practical recommendations to help clients maintain safety, reduce downtime, and meet insurance or audit requirements. The following sections outline the key elements of our PAT testing service.
Solar Systems Installation
A safe, efficient, and financially sound solar power system starts with expert installation, thorough testing, and ongoing care. At Gridlabs, we offer complete solar PV solutions—covering installation, fault finding, system repairs, and performance testing—for residential, commercial, and industrial properties across the UK. Our engineers work in full compliance with key standards such as BS 7671 (IET Wiring Regulations), MCS guidelines, and G98/G99 requirements for grid connection. We manage the full process, including DNO export approval, inverter configuration, and battery storage integration where required.
Gridlabs is committed to delivering cost-effective solar energy systems without compromising quality. We offer some of the most competitive quotations on the market, leveraging trusted suppliers and efficient project management to reduce costs for our clients. Whether you're installing a new system, expanding existing solar capacity, or facing issues like inverter failure or low generation output, our team provides fast diagnostics and targeted repairs.
Our solar PV services not only help you cut energy bills and reduce carbon emissions, but also ensure compliance, maximise system uptime, and unlock the full return on your investment. The following sections outline our core offerings in solar installation, repair, and testing—designed to support energy independence, grid compliance, and long-term performance.
Electrical Installation Condition Reports
A safe and legally compliant electrical system begins with a thorough and professional inspection. Gridlabs offers Electrical Installation Condition Reports (EICR) for domestic, commercial, and industrial premises, helping property owners and facility managers identify hidden risks, maintain compliance with UK regulations, and ensure the ongoing safety of occupants and assets. Our qualified engineers carry out detailed inspections in accordance with BS 7671 (IET Wiring Regulations) and the latest guidance from the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020.
Whether you're preparing for a property sale, renewing a rental agreement, or conducting routine electrical maintenance, our EICR services provide a clear, actionable overview of your installation’s condition. We assess wiring, distribution boards, protective devices, earthing, bonding, and more—highlighting any C1, C2, or C3 issues and offering practical solutions to bring systems up to standard.
Gridlabs delivers accurate reporting, fast turnaround times, and competitive pricing for landlords, business owners, housing associations, and facility managers. With our fixed-price EICR packages and transparent recommendations, we make it easier to meet insurance, legal, and safety obligations—while protecting people, property, and equipment. The following sections outline our EICR inspection scope and process.