Projects

Case studies as engineering evidence

Every case study follows the same structure: problem, engineering decision, controlled execution, verification, and a measurable result.

GIS Installation

330 kV GIS Retrofit

Problem: An ageing 330 kV outdoor switchyard required replacement with GIS on a live transmission site, with no tolerance for unplanned outage of adjacent bays.
Engineering decision: Stage the erection bay-by-bay under planned outages, with gas processing and partial discharge testing sequenced so each bay was fully verified before the next outage window was taken.
Controlled execution: Work proceeded under an inspection and test plan with hold points at foundation acceptance, enclosure alignment, gas filling and dew-point verification, and pre-energisation testing. Every hold point was signed off before the next stage commenced.
Verification: PD testing to IEC 62271-203 on every compartment, SF6 dew-point and purity records per filling, and contact resistance measurement on all primary joints.
Measurable result: All bays energised with zero PD defects detected at handover and no unplanned outages during the works.

Substation Design

Problem: A distribution utility needed a new 132/33 kV zone substation designed to utility standards, with earthing and protection proven before construction tender.
Engineering decision: Complete the primary and secondary design as a single coordinated package — earthing grid study to IEEE 80 / AS 2067 and protection coordination study run in parallel so settings and grading margins were resolved before drawings were issued for construction.
Controlled execution: Design reviews at 30%, 60% and 90% with the utility, each with a documented comment-close-out register. Calculations independently checked before issue.
Verification: Earthing study validated against measured soil resistivity; protection settings verified by secondary injection test plan prepared as part of the design package.
Measurable result: Design package accepted at first utility review with no rework of the earthing or protection studies.

Testing Campaign

Problem: A solar + BESS connection required site acceptance testing of HV cables, transformers and protection within a tight commissioning window before network energisation.
Engineering decision: Deploy rented, in-calibration test equipment with a pre-approved test procedure per asset class, so testing could run in parallel work fronts rather than sequentially.
Controlled execution: Test schedule aligned to the commissioning programme with daily progress reporting; every instrument on site carried a current calibration certificate traceable to a national laboratory.
Verification: VLF and tan-delta on cables, sweep frequency response and insulation tests on transformers, and secondary injection on protection — each result recorded against its acceptance criterion at the time of test.
Measurable result: First-pass acceptance on all tested assets; the energisation date was met with no retesting required.

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