Reliability Analysis of Vertically Integrated Protective Devices in Urban Miniaturized IEC 61850 Substations

The paper presents research on the reliability of vertically integrated protective devices in urban miniaturized IEC 61850 based substations. It emphasizes the practical significance of studying reliability analysis models and methods for such devices. The study involves establishing the hardware structure of the vertically integrated device and constructing a fault tree model using fault tree analysis. Based on this model, the failure rate of the device is calculated in a step-by-step manner, considering individual component modules. The paper then proposes a reliability evaluation model and method for the vertically integrated device. Taking the conventional hardware design scheme of substation secondary equipment as an example, the failure rate and availability of the device without redundant module configuration are calculated for different ambient temperatures. This analysis enables the evaluation of the sensitivity of each module and the identification of weak links. The results demonstrate that the reliability of the vertically integrated device is influenced by the failure rates of different modules, and that redundancy configuration can effectively enhance its reliability. The reliability analysis model and method presented in this paper provide a scientific basis for the design and operation of urban miniaturized IEC 61850 based substations and can be applied to the reliability analysis of other complex systems.