We are introducing some ideas regarding classification the faults and InjUreS that are registered on the operator note in the Central Region's Electrical network in 2005-2006 and analization the reason and properties of these injures and faults. Many years statistics show that Il0kV transformers with 6.3MWA and higher power that were made in Russia, have been working for 20-40years without any special fixing and heating.Injures and faults that occurred in the electrical system in years 2005-2006, shown in Table 1, Figurel.It shows that there are 522 faults were registered and 29 of them were on-11 0-220kV transfonners. Also there were 16 faults of II0-220kV air line, and 150 (93.7%) of them were on Il0kV line. Abstract-In result from several reasons technical injures and fault of electrical transmission lines have not decreased in Mongolia.For lOOkV and more voltage transmission lines, the number of the shut down in electrical lines, tend to increase year by year. The most of these shut down processes the result of thi wrong operating consequent on the long time usage and decrepitude of relay protection.Safety and stability ofthe electrical system depends on the normal, distinct and good operation of the protection equipment and accuracy ofthe measurement tools.Consequently, we need to modify the relay protection and automation equipment. We have to change these old protection and automation equipments by new technology such as microprocessor terminal tools and digital protection tools.This changing and modifying will be the major factor and step to decrease electrical line fault and shut downs number in electrical transmission system.

ABSTRACT. The paper is concerned with the issues of interstate electric power interconnections to be created in the countries of Northeast Asia. The conditions are formulated, the problems are stated, and solutions for Mongolia's entry into the Asian energy space are proposed. The electricity consumption rates are growing, however, the Northeast Asia countries differ considerably in available energy resources to cope with this growth. Therefore, the need to build international electric power interconnections that take into account climatic features, seasonal peak load differences and other factors in order to rationally match power demand and supply is getting increasingly more obvious. Mongolia can take an active part in this process, as the country is rich in energy resources and interested in their development to meet their domestic needs and exchange with neighboring countries. The establishment of interstate power interconnections in the Northeast Asia countries represents a topical task whose solution will make it possible to meet the demand of this region for electricity on mutually beneficial terms. Mongolia has a good spatial position, energy resources and is interested in ensuring domestic energy balance. Therefore, the country can be an active participant in such an integration process.

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The paper addresses research into the prospects for the development of Mongolia’s energy sector with its gradual entry into the international energy markets of neighboring countries through the involvement of local resource potential and the expansion of energy transmission and transportation systems. Rational use of rich primary natural energy resources (coal, solar energy, and nuclear energy), in combination with a favorable geographic location of the country, should contribute to the achievement of the crucial goals to transform Mongolia into an energy exporting-importing country, which is stipulated by the raw materials and energy strategy of the country for the next 15-30 years. In this context, the research considers an integrated approach to the development of the energy system of Mongolia and highlights three hierarchical development levels of backbone transmission lines. The research outcomes are presented as a structure of Mongolia’s energy sector with internal and external functional connections. The conclusion emphasizes the need to build a scientifically grounded rational network structure of the main backbone transmission lines, which will shape the Unified energy system with developed connections to the electric power systems of Russia and China, and through them, to the super grid of the NEA countries. This will allow Mongolia to occupy its place in a successfully developing energy and economic space of the region, which is beneficial not only for Mongolia but also for the NEA countries.