Electrical circuits generally prefer the ground path to return to a physical neutral state. Short circuits are the situations where the lines come into contact with each other or the system comes into contact with the ground. In the event of a short circuit, the resistance is too low. In this case, the voltage value decreases and the current value starts to increase. Short circuit current increases in parallel with the increase in the load amount on the electrical circuit. Therefore, short circuit is a very important problem in higher power systems such as electricity distribution and transmission systems.

In short, short circuit occurs when the cables of the electrical devices touch each other in an electrical installation. The worst result of this event is the danger of electric shock and fire. In case of a short circuit, the total resistance in the circuit decreases. In this case, the amount of current passing through the main circuit increases. This causes the fuse to blow. When the amount of current passing through the electrical circuit becomes too high, it causes overheating. The use of fuses in electrical circuits is to protect against such hazards. When a high amount of electrical current passes through the circuit, the fuse heats up and the circuit breaker is tripped. Otherwise, as the load in the electric circuit increases, the low resistance line starts to burn as a result of heating. This means a fire hazard.

Switch systems such as fuses, voltage breakers or automatic switches are used to protect against short-circuit currents. Which of these equipment will be used depends on the power of the system. For example, automatic fuses are generally used to protect against short circuit in residential buildings. However, voltage cutter and disconnecting equipment are preferred in high power systems.

Our company, within the framework of electrical safety examinationsconducts short circuit protection measurements in accordance with the relevant legal regulations, standards and test methods published by domestic and foreign organizations. A few standards considered in these studies are:

• TS EN 60865-1 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
• TSE IEC / EN 60865-2 Short-circuit currents - Calculation of effects - Part 2: Calculation examples
• TS EN 60909-0 Short-circuit currents in three-phase AA systems - Part 0: Calculating currents
• TS EN 60909-3 Short-circuit currents in three-phase AA systems - Part 3: Currents during two separate line earth short circuits and partial circuit currents flowing to earth