A Co-Simulation Model for the Operating Mechanism of a High-Voltage Circuit Breaker

The reliability of high-voltage circuit breakers (HVCBs) depends critically on the dynamic characteristics of their hydraulic operating mechanisms (OMs).However, previous analyses have been limited to discrete components due to the lack of models capturing multi-physics couplings.This paper proposes a novel co-simulation approach for hydraulic OMs that enables system-level analysis.Specifically, the hydraulic system is modelled using the lumped parameter method, and the transmission mechanism is modelled via finite element analysis.The subsystem models exchange inputs and outputs through shared memory, realizing coupling without compromising simulation performance.Experiments on a 550 kV HVCB validate that the model accurately captures OM transient responses.The co-simulation framework has diverse capabilities, including predicting dynamics under varied operating parameters and quantifying stress distributions and response evolution patterns.Overall, this paper proposes an advanced multi-physics analysis capability for hydraulic OMs to support reliabilityoriented design and optimization.