Abstract
Purpose
Apart from the basic material properties of liquid lubricants, such as, e.g., the viscosity and density of the hydraulic fluid, it is also important to have information regarding the electrical properties of the fluid used. The latter is closely related to the purpose, type, structure, and conditions of use of a hydraulic system, especially the powertrain design and fluid condition monitoring. The insulating capacity of the hydraulic fluid is important in cases where the electric motor of the pump is immersed in the fluid. In other cases, on the basis of changing the electrical conductive properties of the hydraulic fluid, we can refer its condition, and, on this basis, the degree of degradation.
Design/methodology/approach
The paper first highlights the importance of knowing the electrical properties of hydraulic fluids and then aims to compare these properties, such as the breakdown voltage of commonly used hydraulic mineral oils and newer ionic fluids suitable for use as hydraulic fluids.
Findings
Knowledge of this property is crucial for the design approach of modern hydraulic compact power packs. In the following, the emphasis is on the more advanced use of known electrical quantities, such as electrical conductivity and the dielectric constant of a liquid.
Originality/value
Based on the changes in these quantities, we have the possibility of real-time monitoring the hydraulic fluid condition, on the basis of which we judge the degree of fluid degradation and its suitability for further use.
Subject
Surfaces, Coatings and Films,General Energy,Mechanical Engineering
Reference9 articles.
1. Carey, A.A. and Hayzen, A.J. (2001), “Dielectric constant and oil analysis”, available at; www.machinerylubrication.com/Articles/Print/226 (accessed 30 April 2021).
2. The effect of water content on the dielectric strength of polyalphaolefin (PAO) coolants;IEEE Transactions on Dielectrics and Electrical Insulation,2011
3. Insulating liquids – determination of the breakdown voltage at power frequency – test method;IEC 60156,2018
4. Fluids for electrotechnical applications – mineral insulating oils for electrical equipment;IEC 60296,2020
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献