Function of control system
Function of measurement system
The thermal stability tester is applicable for the thermal stability test of SPDs. It is for indoor operation. One frequency AC power source with a constant current between 2mA ~5A is applied on the SPD. The current through the SPD and the surface temperature of the SPD are continuously monitored to check if it reaches thermal equilibrium, and the disconnectors act.
IEC61643-11 surge protective devices-Part 11: surge protective devices connected to low-voltage power systems-requirements and test methods