The arc light protection device can output corresponding fault information after the fault occurs, which is helpful to locate the fault point and shorten the troubleshooting time. At the same time, when the fault is detected, it will immediately trigger the action of the fast grounding switch, quickly block the development of the arc, and help to improve the safety and reliability of the switch cabinet.

The short-circuit arcing fault inside the switch cabinet is a serious and frequent fault in the distribution system. Once the fault arc is generated, if it can not be removed in time, it will release huge energy in a short time, which will lead to serious damage to the switch equipment, and some even develop into the accident of multiple groups of switch cabinets burned at the same time. In recent years, the main transformer damage caused by the impact of short-circuit current is not uncommon, which often brings long-term power failure, resulting in significant economic losses and casualties.

Composition of arc protection system: the system is mainly composed of main control unit, arc light collector, current collector, arc current collector, arc sensor and optical fiber box data line connecting various components. The action criterion of arc protection is two conditions: arc light and over-current. When arc light and current increment are detected, the trip command signal is sent out; when the arc light or current increment is detected, the alarm signal is sent, and the trip command is not issued.

The arc light sensing probe is installed in the bus room of the switch cabinet and the wiring room of the switch cabinet. In case of arc fault in the system, the signal is transmitted to the background monitoring system by the arc light sensor. The monitoring system analyzes the light information and the current change information detected by the current detection unit to identify the fault location. The arc fault can be removed intelligently and quickly to protect the power supply equipment and personal safety.