Data centres are among the most electrically complex facilities being built in Australia today. Redundant supply paths, parallel distribution streams, and zero tolerance for unnecessary outages make protection coordination a fundamentally different challenge to most industrial power systems.
For engineers used to working in mining or heavy industry, the underlying principles are the same — fault level analysis, time-current coordination, relay settings development. But the application demands a level of precision and redundancy that changes how you approach the entire study.
Why Data Centre Protection Is Different
In most industrial facilities, a single distribution stream feeds the site. Protection coordination is about ensuring faults are cleared selectively — the device closest to the fault trips first, and upstream devices stay closed. That logic doesn’t change in a data centre, but the topology does.
Hyperscale data centres typically run multiple independent supply streams feeding the same facility — each with its own switchgear, transformers, and distribution infrastructure. These streams must be studied independently and as a coordinated whole. A fault in one stream can’t be allowed to cascade into another, and protection settings must ensure selective clearance without tripping redundant supply paths that are keeping the facility live.
This is where multi-stream coordination studies become critical.
Multi-Stream Protection: Studying the Parts and the Whole
A typical hyperscale facility might have six or more independent protection streams spanning multiple voltage levels — 33kV utility intake, 11kV internal distribution, and 415V at the rack level. Each stream requires its own protection study covering:
- Overcurrent and short circuit protection — relay modelling and settings at every voltage level, ensuring faults are cleared within equipment withstand ratings
- Earth fault and earth leakage protection — particularly critical in data centres where sensitive electronic equipment demands tight leakage thresholds
- DRUPS protection coordination — Diesel Rotary UPS systems provide ride-through power during supply interruptions, but their protection coordination is complex due to the interaction between stored energy, generator output, and mains supply
But studying each stream in isolation isn’t enough. Where streams share upstream infrastructure — common busbars, shared ring main units, parallel transformer feeds — the protection settings must be coordinated across streams. This is where the wrap-around coordination study comes in.
The Wrap-Around Coordination Study
A coordination study takes every protection device across every stream and maps how they interact under every credible fault scenario. The goal is to prove that:
- Every fault is cleared by the nearest device
- Upstream devices provide backup protection if the primary device fails
- No device trips unnecessarily — particularly on redundant supply paths where a false trip means loss of redundancy
- Time-current curves (TCCs) are graded correctly across all voltage levels from 33kV down to 415V
In a facility with six streams across three voltage levels, this can mean hundreds of individual protection curves that all need to work together. It’s painstaking, iterative work — and it’s the difference between a protection scheme that works on paper and one that works under every real-world fault condition.
Why End-to-End Support Matters
A protection study that ends with a report on someone’s desk is only half the job. The real value is in translating those study outputs into implementable relay setting files, supporting the commissioning team through staged energisation, and adapting settings as site conditions reveal information that wasn’t available during the study phase.
Protection engineering for critical infrastructure should cover the full cycle:
- Study — fault level analysis, protection modelling, TCC development
- Settings — producing relay setting files in the manufacturer’s software, ready to upload
- Amendments — issuing setting updates as the design evolves during construction
- Commissioning support — working with the site team through staged power-up, verifying protection operation at each stage
- Corrections — adapting settings when site conditions differ from the design basis
This end-to-end approach ensures the protection scheme doesn’t just look right in the model — it works in the field.
What to Look for When Engaging a Protection Engineer
If you’re procuring power system protection studies for a data centre or critical infrastructure project, look for an engineering partner who:
- Has experience with multi-stream, multi-voltage protection coordination — not just single-feeder industrial studies
- Can deliver relay setting files, not just reports — the gap between study and implementation is where projects stall
- Will stay involved through to energisation — protection schemes inevitably need adjustment once site conditions are known
- Understands DRUPS and complex redundancy topologies — these are specialist systems that require specific modelling expertise
- Has a rigorous peer review process — protection settings errors in critical infrastructure have consequences that can’t be reversed
From Mining to Data Centres
The skills required for data centre protection engineering — fault analysis, relay coordination, settings development, commissioning support — are the same skills that have been refined over decades in Australia’s mining industry. Underground coal mines have some of the most demanding electrical protection requirements anywhere: high fault levels, restricted fault clearance times, complex earthing systems, and regulatory oversight that demands precision.
Engineers who have built their expertise in these environments bring a level of rigour and practical site experience that translates directly to critical infrastructure protection. Same discipline. Same rigour. Different surface.
See an example of this work in practice →
If your project needs power system protection studies for a data centre or critical infrastructure facility, get in touch.
