What are the protection and test standards for lightning surge immunity

Standard for lightning surge immunity test of electronic equipment

The national standard for lightning surge immunity testing of electronic equipment is GB/T17626.5 (equivalent to the international standard IEC61000-4-5).

The standard mainly simulates various situations of indirect lightning strikes:

(1) Indirect lightning strikes (such as lightning strikes between or within clouds) induce voltage and current on external lines.

(2) The interference introduced by the ground current through the common grounding system when lightning strikes adjacent ground.

(3) Lightning strikes an object near the line, creating a strong electromagnetic field around it that senses the voltage on the external line.

(4) Lightning strikes external lines, causing a large amount of current to flow into external lines or ground resistors, generating interference voltages.

In addition to simulating lightning strikes, the standard also simulates disturbances (voltage transients during switching) introduced in substations and other situations, such as:

(1) Switching thyristor devices equipped with resonant lines.

(2) Interference caused by small switches bouncing around equipment in the same power grid.

(3) Various system faults, such as short circuits and flashover faults between equipment grounding networks or grounding systems.

(4) Interference generated during switching of the main power supply system (such as switching of capacitor banks).

Do a good job in lightning surge protection, involving safety issues, and accurately meet the national standard GB_ T17626.5 Qualified in 2008. The main purpose of the lightning surge immunity test is to simulate the destructive test of thunderstorm weather on lamps and electrical appliances, and confirm whether there are defects in the power supply design.