# HV Substation and Cable Works

Substation electrical packages and HV cable works, 11 kV to 132 kV.

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

CrestWatt delivers substation electrical packages as an integrated scope: equipment specification and supply, installation supervision, cable works, testing, protection integration and energisation. Equipment is sourced through authorised distribution or vetted manufacturers and factory tested before dispatch.

**Standards and methods cited:** IEC 61439, IEC 60502-2, IEC 60840, ENA TS 41-24, BS EN 50522

## Scope

- Substation electrical design and equipment specification
- Supply of 33 kV and 66 kV switchgear (AIS and GIS), power transformers, circuit breakers and auxiliary systems
- 110 V DC battery and charger systems; LVAC distribution boards to IEC 61439
- HV cable supply: 33 kV XLPE to IEC 60502-2 and 66 kV XLPE to IEC 60840, through vetted manufacturers, with freight, customs, duty and inspection managed by CrestWatt
- Cable sealing ends, outdoor terminations, GIS plug-ins, joints and transition joints
- Cable installation supervision, jointing and termination
- HV cable testing: IR, VLF, sheath, tan delta and partial discharge where specified
- Earthing and bonding installation and testing to ENA TS 41-24 and BS EN 50522
- Pre-energisation inspection, DNO witness and energisation

## Recent scope

- 66/33 kV grid substation on a 40 MW solar farm, West Yorkshire: 66 kV cable sealing ends, 110 V DC battery and charger systems, 33 kV switchgear package including protection relays, CTs and VTs
- 66 kV and 30 kV XLPE cable supplied into the UK from an accredited overseas manufacturer, with import, customs and origin documentation managed in-house

## Next step

Send the substation single line diagram and equipment schedule. We will price the package and the programme.

## Common questions

**What does a substation electrical package include?**

Electrical design and equipment specification; supply of 33 kV and 66 kV switchgear, transformers, circuit breakers and auxiliary systems; 110 V DC battery and charger systems; LVAC boards to IEC 61439; HV cable and accessories; installation supervision, jointing and termination; earthing; and testing through to DNO witness and energisation.

**Does CrestWatt supply the HV cable as well as install it?**

Yes. 33 kV XLPE to IEC 60502-2 and 66 kV XLPE to IEC 60840 are sourced through vetted manufacturers, with freight, customs, duty and inspection managed by CrestWatt. Cable has been supplied into the UK from an accredited overseas manufacturer with origin documentation handled in-house.

**Can CrestWatt work with client free-issue equipment?**

Yes. Where switchgear, relays or panels are client-supplied, CrestWatt takes delivery, verifies against the schedule, installs and commissions, and keeps a clear record of supply responsibility for each item.

## Related scopes

- [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.
- [Cable Termination and Testing](https://crestwatt.com/services/cable-termination-testing/): LV, MV and HV terminations to 132 kV; DC crimping and MC4 assembly; fibre fusion splicing; Modbus RS-485 termination. IR, VLF, sheath, TDR, OTDR and certification.
- [ICP and Grid Connections](https://crestwatt.com/services/icp-grid-connections/): Contestable connection works, 11 kV to 132 kV, from application to DNO adoption.