DC Surge protective device,protect against lightning surge voltages in solar system (photovoltaic power supply system). These units must be installed in parallel on the DC networks to be protected and provide common and different modes protection. Its installed location are recommended at both ends of the DC power supply line (solar panel side and incerter/converter side), especially if the line routing is external and long. High energy MOVs equipped with specific thermal disconnectors and related failure indicators.
Impulse current Iimp 1. Where there are no national regulations or specific regulations for the type of building to be protected: the impulse current Iimp shall be at least 12.5 kA (10/350 µs wave) per branch in accordance with IEC 60364-5-534. 2. Where regulations exist: standard IEC 62305-2 defines 4 levels: I, II, III and […]
Operating voltage Uc Depending on the system earthing arrangement, the maximum continuous operating voltage Uc of SPD must be equal to or greater than the values shown in the table in Figure 1. Fig.1 – Stipulated minimum value of Uc for SPDs depending on the system earthing arrangement (based on Table 534.2 of the IEC […]
Following in the footsteps of the previous article, let’s look at some tips to prevent the damage to surge protective devices (SPDs). 1. Overvoltage Conditions As surge protective devices (SPDs) break is due to overvoltage conditions, choosing a suitable voltage for the surge protective devices (SPDs) is important. 2. Burn-in of Surge Protective Devices (SPDs) […]
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