GIS Installation & Commissioning — 66 kV to 500 kV

GIS erection demands clean-room discipline, controlled gas handling and strict OEM procedures. Contamination, moisture or poor alignment leads to failed tests, partial discharge and costly outages.

• Bay assembly, alignment and busduct installation
• SF6 and alternative-gas handling, recovery and filling
• Vacuum processing and moisture control
• Gas purity, dew-point and leak testing
• Partial discharge and power-frequency commissioning tests
• OEM procedure compliance and supervision support

• OEM installation manuals and drawings
• Site readiness and building handover
• Gas-handling and environmental requirements
• Testing and commissioning plan

• Installation records and torque sheets
• Gas handling and mass-balance records
• Moisture, purity and leak test results
• PD and withstand test reports
• Commissioning dossier

1. Stage 1

   Site readiness

   Check cleanliness, foundations and lifting.

2. Stage 2

   Erection

   Assemble bays under controlled conditions.

3. Stage 3

   Gas processing

   Evacuate, fill and test each compartment.

4. Stage 4

   Testing

   Leak, PD and withstand tests.

5. Stage 5

   Handover

   Commissioning dossier issued.

1. 1.Technician performs and records each step
2. 2.Supervisor verifies hold points
3. 3.OEM representative witnesses where required
4. 4.Client witnesses final tests

• DNSP connection and design standards (e.g. Ausgrid, Endeavour, Essential, Energex/Ergon, Powercor, SA Power Networks)
• TNSP requirements (e.g. Transgrid, Powerlink, AusNet, ElectraNet, TasNetworks)
• AEMO / National Electricity Rules Chapter 5 connection obligations
• Network operator access, switching and permit-to-work rules

• Inspection and Test Plan with hold and witness points
• Torque and alignment checklists
• Calibrated gas and test instruments
• Non-conformance reporting and close-out

• Safety in Design (SiD) workshops and hazard register
• HV access, isolation and permit-to-work compliance
• Safe Work Method Statements for high-risk construction work
• Exclusion zones, step/touch potential and induced voltage controls
• Gas handling exposure controls and monitoring
• Lifting plans for heavy components

• SF6 mass-balance accounting and leak minimisation
• Gas recovery and recycling
• Support for SF6-free technologies

• Design decisions recorded against asset life-cycle cost (ISO 55001)
• Asset data and as-built records handed over in client asset-register format
• Maintainability and spares strategy considered at design stage
• Baseline gas and PD data recorded for condition monitoring

• OEM supervisors
• Civil and building contractors
• Cable termination teams
• Protection and SCADA commissioning

Indicative only — actual programme depends on scope, approvals and outage windows.