The increasing adoption of microinverters in photovoltaic systems has expanded the demand for solutions focused on electrical protection on the AC (Alternating Current) side, especially in projects that concentrate several interconnected devices on the same circuit.
Thus, the market began to develop more specific products to mitigate the risks associated with electrical surges and transient overvoltages.
Douglas Lara, Application Engineering Coordinator at Clamper, warns: "When several microinverters are connected to the same AC circuit, a single surge event can propagate and simultaneously affect various devices."
According to Brazilian technical standards, such as ABNT NBR 5419 and the ABNT NBR IEC 61643 series, the implementation of surge protection devices (SPDs) is considered an essential part of any electrical project, regardless of the photovoltaic system topology.
As explained LaraThis protection should be specifically targeted at the alternating current side, where the microinverters are connected to the electrical grid.
With a focus on AC side protection, among the solutions available on the market, the Clamper Front Box line was developed for photovoltaic systems with microinverters.
The product features 4 mm² cable cross-section for input and output, a maximum current of 25 A, and a 6 mm² grounding conductor, characteristics aligned with the technical requirements of these systems.
With regard to surge protection, the device falls into class II, with technology based on metal oxide varistors, operating in LL, LN, L-PE and N-PE modes in TN systems, and LL and LN in IT and TT systems.
The protection level (Up) is 1,2 kV, with a response time of less than 25 nanoseconds, parameters associated with rapid action in the face of transient events.
The relevance of this type of solution gains even more weight in the Brazilian context. Brazil is among the countries with the highest incidence of lightning strikes in the world, registering, on average, between 70 and 80 million lightning strikes per year, according to data from INPE (National Institute for Space Research).
This scenario makes photovoltaic systems, which rely on sensitive electronic equipment, especially vulnerable, including when discharges occur indirectly.
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