Review of the technical condition of electrical equipment in the developing energy system of the Republic of Tajikistan

The paper analyses the technical condition of the electrical equipment currently installed at the power plants and substations in the electric power system of the Republic of Tajikistan (EPS RT) with account to the system development prospects. Each of the EPS RT elements is considered separately, their service life as well as their quality condition are estimated. It is shown that as far as the 0.4-500 kV power lines are concerned, 18115 km (28.7 %) are in good condition, 32887 km (52.1 %) are in satisfactory condition, 12263 km (19.8 %) are in unsatisfactory condition. The paper also identifies the share of electrical equipment operating outside the standard service life, i.e. 78 % power transformers, 56 % high-voltage circuit breakers (HVCB), 70 % synchronous generators. It also analyzes the structure of system changes and the commissioning of the EPS RT basic units with a voltage of 110-500 kV in 2015-2039. When the power systems of the neighboring countries are connected to the EPS RT the levels of short-circuit currents (SCC) increase. The operation of worn-out equipment can cause numerous accidents, therefore, it is recommended to replace them with new equipment types, as well as continue the SCC coordination, checking the electrodynamic stability of power transformers, based on the HVCB breaking capacity.