A method and device for evaluating gis equipment

Abstract

The invention provides a GIS (Gas Insulated Switchgear) evaluation method which is implemented on a GIS, wherein the GIS comprises a plurality of subsystems and every subsystem comprises a plurality of elements. The GIS evaluation method comprises extracting historical data of the GIS and obtaining the fault rate of every element arranged in the corresponding subsystem according to a proportional hazard model; calculating probability values and evaluation values of every subsystem according to a preset algorithm, wherein the probability values are corresponding to the healthy state, the sub-healthy state and unhealthy state respectively and every probability value is correspondingly combined into the corresponding evaluation value; obtaining the defect and fault state of every subsystem to revise the evaluation values of every subsystem; establishing a bayesian network according to the GIS logical relation; obtaining the conditional probability of the GIS through the bayesian formula according to the bayesian network and the revised evaluation values to determine the system reliability. According to the GIS evaluation method and device, multiple information sources can be integrated, the complexity of the GIS can be combined, the numerical value of the reliability of the GIS can be quantized, and the reliability of the GIS can be accurately and rapidly evaluated.

Description

technical field [0001] The invention relates to the technical field of power system GIS equipment, in particular to a method and device for evaluating gas-insulated metal-enclosed switchgear. Background technique [0002] GIS equipment (Gas Insulated Switchgear, gas-insulated metal-enclosed switchgear) is widely used due to its high reliability, simple maintenance, small footprint, and excellent insulation performance. However, with the increase in the use of GIS equipment in recent years, its defects and Accidents are also gradually revealed, especially GIS equipment often operates in key power stations and key areas, and accidents often lead to serious consequences. [0003] At present, there are three methods for the reliability evaluation of GIS equipment: 1. Using expert experience and combining the design service life of the equipment to estimate the decommissioning time; 2. Combining some methods of online monitoring, relying on setting some simple failure thresholds ...

AI Technical Summary

Problems solved by technology

[0004] The inventor found that the above three evaluation methods all have deficiencies. The disadvantages are: in the first method, the method is easily affected by expert experience, and the design service life of the equipment is different for a certain type of equipment. Language is a fixed value that cannot be changed as the actual environment of the equipment is used, so it will lead to the early decommissioning of GIS equipment and cause a huge waste of resources, and the reduction of reliability will cause huge economic property losses; in the second method In this method, the judgment standard of the threshold value is not accurate, and the recognition of some complex online monitoring signals (such as UHF and vibration signals) is still under study, so that the reliability evaluation of multivariate information fusion cannot be realized; in the third In the method, this method is a black-box system, which lacks interpretability, and GIS equipment as a complex system has its own structure and characteristics, and different components have different failure laws, which cannot be considered by neural networks, so it leads to The reliability of GIS equipment existing in multiple non-redundant subsystems cannot be accurately evaluated

Images