HV Substation Design & Engineering Services Australia

Our primary design engineers develop the physical and electrical arrangement of substation equipment. Deliverables include single line diagrams (SLDs), general arrangement drawings, equipment layouts, busbar configurations (single bus, double bus, breaker-and-a-half, ring bus), cable route and sizing calculations, HV and LV cable schedules, equipment specifications and datasheets, earthing design (with earth potential rise and step/touch analysis), and lightning protection design. All designs comply with AS/NZS 62271, AS/NZS 3000, ENA guidelines, and NSP-specific standards.

Case study: 22 kV switchgear replacement, design and commissioning

Protection design is our core strength. We develop complete protection and control schemes for new substations and augmentation projects, including protection philosophy and functional specifications, protection settings calculations and coordination studies, relay configuration and parameterisation (ABB, Siemens, SEL, GE, Schneider Electric), AC and DC schematic drawings, panel wiring diagrams and terminal schedules, and IEC 61850 system configuration (SCL/SCD files, GOOSE mapping, MMS data models). Our protection engineers have deep experience across all standard schemes: overcurrent, differential (transformer, busbar, line), distance, auto-reclose, breaker failure, synchrocheck, and special protection schemes.

We design complete substation automation systems, including SCADA architecture and RTU/gateway specification, IEC 61850 station bus and process bus design, DNP3 and Modbus point lists and protocol mapping, alarm management philosophy, and HMI screen design. Our designs ensure seamless integration with existing NSP and AEMO control systems.

Using ETAP, DIgSILENT PowerFactory, SKM, and CAPE, we perform load flow, short circuit, protection coordination, harmonic, arc flash, and earthing studies to support design decisions and regulatory compliance. See our dedicated Power System Studies page for details.

Megavar provides independent peer review and auditing of third-party substation designs, including design compliance checking against specifications and standards, protection settings verification, constructability review, and risk assessment. This service is particularly valuable for asset owners who engage design-and-construct contractors and require independent quality assurance.

Megavar designs HV substations for sites in Melbourne and across regional Victoria, including wind, solar and battery projects and industrial customer substations. Design is led from our Tasmanian and Adelaide offices, with site visits for inspection, audit and construction support as the project needs.

• Expertise: Extensive experience in HV substation design, engineering, and substation commissioning across diverse industries.
• Reliability: Quality-driven processes that deliver dependable solutions every time.
• Innovation: The latest technologies and methodologies to meet the highest standards.
• Safety Commitment: Prioritising safety to protect both our team and your assets.

Let Megavar handle your HV substation design, substation maintenance, and engineering needs, and experience the difference our dedication and skill can make. Contact us today to discuss how we can help achieve your project goals.