One of the important elements within an electrical system is the electrical substation since it is the sub-system that produces, transforms, regulates and distributes power.Ensuring that this process works properly is key in everything related to the energy industry; this document is an analysis and meticulous study that focuses on comparing the calculation of the reliability of a typical electrical substation, with and without implementing the IEC61850 (GOOSE) standard.The results suggest that when implementing the IEC61850 standard, system reliability is increased by 15%.Keyword-Reliability, double busbar substation, IEC 61850, Monte Carlo simulation.I. INTRODUCTION Due to different faults that arise in a substation, it is necessary to estimate the system reliability.The method to calculate this value is the fault tree, to determine the losses that can be had in the substation.According to studies that have been carried out, the advantages and/or disadvantages of standardization must be known for each of the elements that make up the system for this study.II. THEORETICAL FRAMEWORK A substation is a key element of an electric power system, to feed the industrial, commercial and residential sectors, thus, it is necessary to incorporate a communications system to improve reliability in substation operations.Thus reducing downtimes to increase service quality, and diminishing economic losses.To calculate reliability, it is necessary to incorporate the fault tree to determine it and to predict possible problems in the study system; and in this manner, study the implementation of the IEC61850 standard (GOOSE).GOOSE (Generic Object Oriented Substation Event), it is a standard for fast transmission of events in a substation, such as commands, alarms, indications, as well as messages [1].Using LAN (Local Area Network) high-speed data transmission [2], decreases considerably the amount of wiring, and enables, because of its immunity to electromagnetic interference (in the case of fiber optics), its used as close as possible to the primary process.On the other hand, the use of IEDs, (Intelligent Electronic Device) based on microprocessors, offers new possibilities such as self-supervision, signal analysis, computational facilities for protection and control algorithms, data storage, event handling and fault analysis.Technological developments in this area have achieved a significant reduction in the physical space required to install protection, measurement, control and supervision systems, directly influencing a cost reduction in the project.Thereby improving the operation, reduction and maintenance planning, providing a number of benefits that are important advantages when compared to conventional systems.III. DEFINITIONS TO CALCULATE RELIABILITY Some definitions for calculating reliability are: A. Reliability It is defined as the probability that the system will perform its intended functions without incident for a certain period of time and under set conditions.Knowledge of reliability in electrical equipment is an important consideration in the design of power distribution systems for industrial plants.It is possible to make quantitative comparisons of the reliability between different designs, and use this information, with cost-benefit studies to determine which type of alternative should be used.[3].