Mega Watt Power is carving out a specialised niche in advanced transformer diagnostics to protect the multi-million-dollar substation assets that underpin grid connection and long-term asset reliability.

As renewable assets scale in size and complexity, Mega Watt Power is advancing specialised transformer diagnostics at utility-scale substations to reduce risk and strengthen grid-connection resilience across Australia.

For wind, solar and battery energy storage system (BESS) projects, the substation serves as the purpose-built connection point to the transmission network – stepping up voltage, coordinating protection systems and maintaining grid compliance. At the centre of that infrastructure sits the transformer, a high-value asset that can make or break a utility-scale project.

“Everything becomes exponentially more critical as the voltages go up,” says Peter Bulanyi, Founder and Managing Director at Mega Watt Power.

“When you’re working in substations, you’re dealing with assets that can’t be allowed to fail quietly.”

Coffs Harbour based Mega Watt Power is operating in a specialised corner of this high-voltage environment through the delivery of advanced transformer diagnostics, specifically Sweep Frequency Response Analysis (SFRA) and Dielectric Frequency Response (DFR), alongside broader substation maintenance programs.

“These things are next-level testing. They’re quite specialised,” Bulanyi says.

Working inside live substations

Mega Watt Power typically undertakes substation diagnostic work as a subcontractor to operations and maintenance (O&M) contractors. Engagements are tightly programmed, often spanning three to four nights. These projects incorporate a series of circuit breaker testing, switchgear inspection, earthing verification, protection relay testing and transformer assessments.

“For the substation work, we’re generally working for the O&M contractor and providing subcontract services to come in and do a full range of specialised tests and checks. We might be there for three or four days, typically,” Bulanyi explains.

Much of the work is conducted overnight to avoid interrupting generation.

“When the sun goes down, the solar stops. That’s when we can go in and work. We want to be finished by about 4am so no production gets lost,” Bulanyi says.

“The operating conditions highlight the stakes. These are high-value, continuously operating assets that underpin project revenue. Maintenance and diagnostics must be delivered safely, efficiently and without introducing unnecessary downtime.”

SFRA: Identifying transformer internal movement

SFRA is designed to verify the mechanical integrity of transformer windings and core structures. It can detect internal displacement or deformation caused by transport stresses, fault currents or short-circuit events.

“SFRA is a comparison with the factory benchmark. Its purpose is to detect if there have been any geometrical changes inside the transformer,” Bulanyi says.

Inside the transformer tank are large windings, an iron core and structural supports. Their physical configuration produces a characteristic frequency response signature.

“If there’s been movement of windings, the core or supports, that curve will change. We’re looking for deviations from the benchmark signature,” Bulanyi says.

Mega Watt Power connects specialised SFRA equipment to the transformer, sweeps a range of frequencies through the asset and records the resulting response curve.

Such internal movement is not visible externally, but under electrical stress it can increase failure risk. Early detection provides asset owners with the opportunity to investigate and mitigate before the issue escalates.

“These tests are very revealing. They’re arguably undervalued in the market,” Bulanyi says.

DFR: Understanding insulation health

DFR focuses on the cellulose insulation condition, with particular emphasis on moisture content and ageing within transformer insulation systems.

“DFR performs a power factor versus frequency response,” Bulanyi explains.

“The result is a curve, and the shape and dimensions of that curve are cross-referenced to the CIGRÉ reference chart.”

CIGRÉ provide an internationally recognised benchmark used to interpret transformer insulation condition.

“That chart can tell a great deal about the moisture content of the transformer insulation,” Bulanyi says.

Moisture is a critical reliability factor in high-voltage transformers. Elevated moisture levels accelerate insulation degradation and increase the likelihood of long-term failure.

“The advantage is additional insight. It’s more knowledge about what’s happening inside your transformer,” Bulanyi says.

For renewable asset owners, that insight feeds directly into ongoing condition monitoring and asset management strategies, supporting trend analysis and predictive maintenance planning.

“It’s about establishing trends over time. We would much rather prevent problems before they actually happen,” Bulanyi adds.

Beyond garden variety

While advanced transformer diagnostics are well established in broader utility engineering sectors, only a limited subset of renewable-focused contractors deliver SFRA and DFR capability in-house at utility scale.

“There’s not many who do that. It’s not a garden variety offer in the market,” Bulanyi says. Part of the reason lies in the level of expertise required.

“The SFRA test is really an electronics-style test. It’s more than regular electrical testing. It requires specialised equipment and results interpretation,” Bulanyi says.

Cost considerations can also play a role in decision-making.

“The garden variety tests are much lower cost and easier to perform, and of course, we provide all these too,” Bulanyi says.

“SFRA and DFR add more to a stock standard testing regime. From a budget perspective, they can be overlooked.”

Yet he argues that context matters.

“Transformers are big devices. If there’s a failure, that creates a lot of pain and downtime. They’re not easy to replace,” Bulanyi says.

Utility-scale transformers, such as those serving 200-megawatt substations, represent significant capital investments, with extended procurement lead times. In that environment, early-warning diagnostics become a form of risk mitigation rather than discretionary expenditure.

“We’re trying to predict if there’s an issue and catch it before it becomes a bigger problem,” Bulanyi says.

Protecting assets underpin performance

Substation diagnostic work is typically delivered by compact, highly skilled teams.

“These teams are always pretty small – about four to six people – made up of electricians, technicians and engineers,” Bulanyi says.

Protection relay testing, transformer diagnostics and circuit breaker assessments may run concurrently, depending on scope. Mega Watt Power explains why experience and adaptability are central to delivery.

“Nothing stands still in renewable energy. There’s new techniques, new equipment, new brands year to year. And so, every substation is different to a degree, and requires resourcefulness,” Bulanyi says.

Maintaining technical currency is an ongoing process.

“We stay on top by remaining passionate about what we’re doing. We’re constantly reading, learning, staying up to date with manufacturing partners, and attending courses. It’s not just a job, it’s a passion,” Bulanyi says.

As Australia’s renewable assets mature, focus is shifting from rapid deployment towards long-term reliability and lifecycle performance.

Advanced diagnostics such as SFRA and DFR provide deeper visibility into transformer conditions – strongly supporting asset management decisions and reducing uncertainty around grid-connection equipment.

“The value of these tests is insight. It’s understanding what’s happening inside the transformer before it turns into a failure,” Bulanyi says.

In a market where renewable generation supplies more than 35 per cent of Australia’s electricity and large-scale batteries are being commissioned at record pace, downtime carries escalating commercial consequences, making the protection of high-value substation assets an obvious priority for asset owners.

As Bulanyi sees it, that begins with the right specialist testing that ensures infrastructure needed to power Australia’s path to net zero remains functional and connected to the grid.

This article was featured in ecogeneration magazine (April 2026 edition).