1. The arc at the short-circuit poi

1. The arc at the short-circuit point may burn out the electrical equipment, and the large short-circuit current passing through the equipment will increase the heat. When the short-circuit lasts for a long time, the equipment may overheat and be damaged.2. The short circuit generates huge electric power, which causes the electrical equipment to be deformed or damaged mechanically.3. In case of short circuit, the system voltage will drop significantly, which has a great impact on the user's work. The most important power load in the system is asynchronous motor, whose electromagnetic torque is proportional to the square of its terminal voltage. When the voltage drops, the electromagnetic torque will be significantly reduced, making the motor stop running, resulting in serious consequences such as product scrap and equipment damage.4. Serious short circuit may affect the stability of power system operation, make the synchronous generator running in parallel lose synchronization, and cause system disconnection or even collapse.5. Short circuit leads to power failure, loss to national economy and inconvenience to people's life.6. Unbalanced current caused by asymmetric short circuit to ground will produce zero sequence unbalanced magnetic flux, which will induce large electromotive force in the adjacent parallel lines (such as communication lines, railway signal system, etc.), causing interference to communication, even endangering the safety of equipment and personnel.