# Engineering and Grid Studies

Electrical design and studies for solar, storage and connection projects.

Source: https://crestwatt.com/services/engineering-grid-studies/
Publisher: CrestWatt — Electrical contracting for utility-scale solar, storage and grid connections.
Contact: info@crestwatt.com
Language: en-GB

Design and study work is scoped and quoted at a fixed price, from single line diagrams and cable schedules to earthing assessment, protection grading and grid compliance studies.

**Standards and methods cited:** BS 7671, IEC 60287, ENA TS 41-24, BS EN 50522, ENA EREC G99, ENA EREC P28

## Scope

- Electrical design: single line diagrams, cable sizing to BS 7671 and IEC 60287, cable routing, transformer station layout, LV and HV distribution
- PV electrical design: string configuration, combiner box allocation, DC cable schedules, inverter and transformer station allocation, DC losses
- Earthing design and assessment to ENA TS 41-24 and BS EN 50522, including brownfield sites with existing buried earthing systems and soil resistivity survey
- Protection studies, grading and settings
- Grid studies: load flow, fault level, G99 compliance, harmonic assessment, reactive capability
- Connection application support and DNO technical liaison
- Power plant controller specification: G99 and P28 compliance, frequency response modes, aggregator interface requirements
- Design review and owner’s engineer support
- Techno-commercial proposals and delivery frameworks for EPC subcontract scopes

## Recent scope

- 480 MW solar development in three phases: PV and electrical design as framework subcontractor to a European EPC
- 57 MW battery storage site on a former DNO compound: earthing design assessment around a live existing buried earthing system

## Next step

Send the scope of the study or design package. A fixed price and a delivery date will follow.

## Common questions

**What design and study work does CrestWatt take on?**

Single line diagrams and cable sizing to BS 7671 and IEC 60287, PV electrical design including string configuration and DC cable schedules, earthing design to ENA TS 41-24 and BS EN 50522, protection studies and settings, and grid studies covering load flow, fault level, G99 compliance, harmonics and reactive capability.

**How is design work priced?**

Design and study work is scoped and quoted at a fixed price, with a stated delivery date.

**Can CrestWatt assess earthing on a brownfield site?**

Yes. Earthing design and assessment includes brownfield sites with existing buried earthing systems and soil resistivity survey — for example a 57 MW battery storage site on a former DNO compound, assessed around a live existing buried earthing system.

## Related scopes

- [ICP and Grid Connections](https://crestwatt.com/services/icp-grid-connections/): Contestable connection works, 11 kV to 132 kV, from application to DNO adoption.
- [Protection, Control and Switchgear](https://crestwatt.com/services/protection-control-switchgear/): Relay, CT and VT supply; panel design, build and wiring; IEC 61850 configuration; settings; secondary and primary injection; site acceptance.
- [Testing and Commissioning](https://crestwatt.com/services/testing-commissioning/): IEC 62446-1 DC commissioning; AC, LV and HV pre-energisation testing; protection commissioning; SCADA point to point; witness testing; FAC compilation.