The safe and stable operation of power grid will inevitably provide people with stable power supply and other power sources, and then realize the active operation and management of all walks of life. The safe operation of power grid is very important for our daily life and work, especially in the rapid development of computer technology today. But it is undeniable that in the operation of power grid, in addition to mechanical failure and system failure, there are other force majeure factors that will have a serious impact on its safe operation, including lightning, a natural disaster factor. Lightning is the primary factor affecting the safe operation of power grid except for natural disaster and external force damage. The power systems of all countries in the world have invested a lot of human and material resources to carry out relevant research to deal with the impact of lightning.

The power system includes primary and secondary systems. PTG mainly provides protection for low-voltage system, including low-voltage distribution system, CCTV monitoring system, communication network system, GPS system, etc. Low voltage distribution system, including transformer, main distribution cabinet, AC panel and terminal distribution unit, etc. The power system of construction also belongs to the power grids category.

In accordance to:

1. IEC 62305: Protection against Lightning

2. IEC 61312: Protection against Lightning Electromagnetic Impulse

3. IEC 61643-11: Low-voltage Surge Protective Devices

4. IEC 61643-21: Surge protective devices connected to telecommunications and signaling networks - Performance requirements and testing methods