Transformer CFD and FSI Engineering
Understanding Extreme Transformer Failure Mechanisms
Transformer failures are not single-physics events.
They involve electrical, thermal, fluid and mechanical interactions occurring in milliseconds.
SERGI uses advanced simulation techniques to understand these mechanisms, guide design decisions and validate protection architectures.
Why Simulation Matters in Transformer Protection
Transformer failures are complex by nature.
An internal transformer fault typically involves:
- an electrical arc,
- rapid gas generation,
- violent pressure propagation,
- oil movement, stress on the tank and components.
These phenomena are:
- highly dynamic,
- strongly coupled and cannot be qualified by a single scalar or simplified assumption alone.
SERGI’s Multiphysics Simulation Approach
SERGI integrates simulation as a core engineering capability, not as an isolated analytical exercise.
Computational Fluid Dynamics (CFD)
- CFD is used to model
- oil flow and fluid displacement,
- gas expansion and pressure propagation,
- interaction between oil, gas and internal structures.
This allows SERGI to:
- anticipate extreme flow patterns,
- identify pressure concentration zones,
- understand how dynamic loads develop and propagate.
Simulation Under Extreme Conditions
In addition to internal fault scenarios, SERGI’s simulation capabilities allow assessment of transformer behavior under extreme external conditions including:
Computational Fluid Dynamics (CFD)
- CFD is used to model
- strong wind and storm events,
- offshore and platform-induced dynamic loads,
- combined mechanical and thermal stresses.
Simulation Across SERGI’s Protection Architecture
| Protection Layer | Role of Simulation |
|---|---|
Core Mechanical Protection |
Evaluate pressure propagation and structural response within defined assumptions and boundary conditions. |
Tactical Protection Systems |
✓ Adapt designs to spatial and operational constraints. |
Retrofit & Modernization |
✓ Assess achievable performance within existing limitations. |
Resilience Accessories |
✓ Understand consequence-control mechanisms. |
Simulation is therefore a cross-cutting capability, reinforcing the entire protection architecture.
Reliable protection starts with understanding reality.
By mastering multiphysics simulation and combining it with real-world experience,SERGI uses modelling, test correlation and project data to support engineering decisions within an explicitly defined domain of applicability.
Representative Inputs and Boundary Conditions
Model credibility depends on the actual transformer geometry, arc location, energy and duration, connected oil volumes, open or restricted passages, hydraulic impedance, discharge paths, backpressure, structural modes, added oil mass, damping and nonlinear response.
A model developed for an isolated compartment does not qualify an open-connected compartment without a validated transfer assessment.
What Modelling Can and Cannot Do
Modelling can support design comparison, sensitivity analysis, local pressure assessment, structural-response assessment and project-specific sizing.
Modelling does not replace representative test evidence, complete as-built data, documented assumptions, uncertainty assessment or professional engineering judgement.
