Short Circuit Analysis on Electrical Power Supply Building #71 BATAN for Case Reliability Study of Nuclear Power Plant Electrical Protection System

摘要

Short circuit analysis of electrical power supply building #71 BATAN has been carried out. The electric power supply system in building # 71 consists of the main electrical power supply from PLN of 2500 kVa and an emergency power supply supplied from a diesel generator that supplies office lighting and a nuclear standard laboratory of 200 kVa. The purpose of this study is to study the emergency power supply protection system components as well as the normal short circuit current, because the power supply system in nuclear power plants has a high safety margin. The load that is loaded consists of a mixture load of either 3 phases or 1 phase in the amount of 50 kVA, and the lighting load is 36 kVA. From the analysis using ETAP software which consists of short phase to ground, between phases, showing the value of short circuit current flowing in each system and component, the current of short circuit is 64.6 kA the existing CB panel bus of the system is 80 kA, it means the safety margin is still far above that installed. This value is used to evaluate the rating of low power nuclear power supply protection systems between 3 MW to 10 MW, with 200 kVA emergency power supply.