To choose the best technology for surge protective devices, we should consider the following technical parameters (include but not limited to):
1. Type of surge protective devices according to EN61643-11/IEC 61643-11
2. Nominal Voltage (Un)
3. Maximum Continuous Operating Voltage (Uc) /Maximum Continuous Operating Voltage for PV System (Ucpv)
4. Voltage Protection Level (Up)
5. Nominal Discharge Current (In)
6. Maximum Discharge Current (Imax)
The components of a SPD The SPD chiefly consists of (see Fig.1): 1) one or more nonlinear components: the live part (varistor, gas discharge tube, etc.); 2) a thermal protective device (internal disconnector) which protects it from thermal runaway at end of life (SPD with varistor); 3) an indicator which indicates end of life of […]
DC SPD applied to the Din rail type protects the DC electric system from surge. Also, the system allows replacement of the protective element (MOV), ensuring convenience and reduced cost. However, as only the protective module is provided, other components should be added when the system is installed in accordance with the site condition.
DC MCB (DC miniature circuit breaker) plays a key role in the power system. First of all, DC MCB is a common switch in the control circuit, which mainly has two functions: on-off circuit and protection circuit. It adopts a special arc extinguishing and current limiting system, which can quickly disconnect the fault current of the […]
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