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Baganuur Southeast Electricity Distribution Network 15 kV electrical transmission line interruptions research was conducted, and a factor analysis was performed to determine the conditions of the line outage. Due to the neutral grounding of the 15 kV electrical transmission line and the relatively small distance between the line wires and crossbar, there is a high incidence of grounding during the landing and flight of birds, which hurts the reliable operation and ecology of the line. Therefore, the structure of the poles changed, and the results are reflected.

The third thermal power plant is one of the largest in Mongolia, generating about 30% of Mongolia's electricity and more than 60% of Ulaanbaatar's thermal energy. Although Mongolia's electricity consumption has grown steadily, no new power plants have been built to meet this increased demand. This increase in load and the intermittent characteristic of renewable energy have adversely affected thermal power plants' sustainability. Therefore, to study how the static and dynamic transition process of the power plant is affecting the operation, the 110kV 35kV 10kV 6kV general circuit scheme was fully modelled on Powerfactory software to analyse the performance of the load flow, load loss, voltage level, determination of the loading condition, balanced and unbalanced short circuit calculation results are demonstrated.

In the last years within the frame of reform works of Mongolian Energy systems, Power resources, widely have been introduced monitoring and protecting devices based on the microprocessor. Here we have been conducting the research on the usage and exploitation, maintenance of recently introduced monitoring and protecting devices based on the microprocessor.Key words electromagnetic mIcroprocessor. -Mongolian compatibility, Energy relay systems, protection, In this research we have involved Central Energy system (main resources such as Power Plants N2, 3, 4, in Ulaanbaatar, Darkhan and Erdenet Power Plants, Durgun Hydro power plant, Taishir-Guulin Hydro power plant, Dalanzadgad Power Plant, and main substations of energy system such as 220k V Ulaanbaatar, Tuul, Erdenet substations, 110kV Baganuur, Choir, Arvaikheer, Undurkhaan substations), Altai-Uliastai local Energy Network, Western Energy systems. 1. If classifY the relay protection & automatic equipment of Central Energy systems by the type of element base: 11 D Electromagnetic relay % 10 • Mechanical relay % • Semi -conductor relay • Microprocessor relay 2. If classify the relay protection & automatic equipment of Altai-Uliastai local Energy Network by the type of element base: 10 %