The fault of electrical transmission lines and function relay protection & automation

In result from several reasons technical injures and fault of electrical transmission lines have not decreased in Mongolia. For 100 kV 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 the wrong operating consequent on the long time usage and decrepitude of relay protection. Safety and stability of the electrical system depends on the normal, distinct and good operation of the protection equipment and accuracy of the 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.