OngoingTransport Infrastructure33kV
Western Harbour Tunnel
Sydney region, NSW
One technical standard, held across multiple packages.
Nebula delivers high-voltage electrical works across multiple packages on the Western Harbour Tunnel, for a Tier 1 transport infrastructure joint venture: installation, testing and commissioning of the 33kV system and the plant behind it.
A multi-package structure on a Tier 1 job means sequencing against other contractors’ fronts and holding one technical standard across every package, rather than letting each one drift to its own. The commissioning scope reaches past the switchgear into GOOSE IEC 61850 protection, SCADA control and BMS integration.
What the scope covered
- 33kV GIS switchgear installed and commissioned
- Transformer and OLTC equipment
- Battery charger and UPS systems
- Secondary wiring throughout
- GOOSE IEC 61850 protection, SCADA control and BMS integration
33kV GIS, from installation through to GOOSE.
HV electrical works across multiple packages including installation, testing and commissioning.
Installation
33kV GIS switchgear, battery charger systems, transformer and OLTC equipment, secondary wiring and UPS systems.
Commissioning
Full primary and secondary commissioning of the 33kV GIS, GOOSE IEC 61850 protection, SCADA control and BMS integration.
Testing
Transformer commissioning including high potential testing, tan delta, turns ratio, winding resistance, OLTC and Buchholz points verification.
Outcome Packages energised, hold points cleared, defects at handover.
- 33kV GIS switchgear installed
- Battery charger systems, transformer and OLTC equipment installed
- Secondary wiring and UPS systems
- Transformer commissioning: high potential, tan delta, turns ratio, winding resistance, OLTC and Buchholz points
- Full primary and secondary commissioning of the 33kV GIS
- GOOSE IEC 61850 protection, SCADA control and BMS integration
Every Nebula scope is delivered with structured test scripts, hold point sign-off and a full documentation package. Set against the testing performed on this project, that is the pack below.
- Structured test scriptsStandard on every scope
- Hold point sign-offStandard on every scope
- Full documentation packageStandard on every scope
- 33kV GIS primary and secondary commissioning recordsPer package
- Transformer test results: tan delta, turns ratio, winding resistancePer unit
- OLTC and Buchholz points verificationPer unit
- IEC 61850 GOOSE configuration and protection settingsPer scheme
Location and alignment imagery: route map © NSW Government (CC BY-SA 4.0); Bays Precinct photograph by Maksym Kozlenko (CC BY-SA 4.0); Warringah Freeway photographs by Adam J.W.C. and Shultz6 (CC BY-SA 2.5 / 3.0), all via Wikimedia Commons.
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