How to solve photovoltaic fires caused by DC arc? These points must be known as
At a time when photovoltaic installed capacity has repeatedly hit new highs, distributed photovoltaic power station fires have also occurred frequently. Similar to the following reports of photovoltaic power station fires, whether for household use or industrial and commercial, it is common worldwide:
The cause of fires in photovoltaic power stations
According to a German report, among the 1.7 million photovoltaic modules installed, 430 component-related fires occurred, of which 210 were caused by the photovoltaic system itself. Factors such as system design defects, component defects or installation errors will cause the photovoltaic system to catch fire. According to statistics, more than 80% of power stations are ignited due to DC side failure.
In photovoltaic systems, due to the superposition of component voltages, a series of component circuits often have a DC high voltage of about 600V to 1000V. When the cable connection aging, connector failure, model mismatch, virtual connection or when the two conductors of the opposite polarity are in the DC circuit , and the insulation between the two wires fails, under the action of high voltage, a DC arc is likely to occur, open flames and fires are caused. It can be seen that arc sparks caused by DC high voltage are the "culprit" of photovoltaic fires.
Therefore, the inverter DC manufacturer company has launched a circuit protection device AFCI, whose main function is to prevent fire from being caused by faulty arcs. It has the ability to detect and distinguish between normal arcs and fault arcs generated by the inverter when starting and stopping or switching, and cut off the circuit in time after discovering a fault arc.
In addition to installing an inverter circuit protection device, the following points should also be noted:
1. Connection cable aging
The aging of the cable will increase the power consumption. After the line aging, if the external insulation guard sleeve is damaged, it will not only increase the wire consumption and increase the power consumption, but also cause a fire accident in the power circuit of . Need to be replaced immediately. Wires often age at high temperatures, and when the temperature is too high, the surface insulation is ignited and caused fire; and when the cable is wet, it is prone to short-circuit leakage, causing accidents.
Therefore, if you want to better prevent the aging and damage of wires and cables, it is recommended that in addition to using them in the correct way, you should also pay attention to regular inspections. Only in this way can you determine whether the wires and cables are safer and avoid causing various safety hazards.
2, inverter connector failure, model mismatch, virtual connection or when polarity is opposite
, connector failure is inevitable during the use of the connector. Although each connector has a rated service cycle, for smart devices, device failure problems caused by connectors are also emerging one after another. Therefore, it is crucial to choose a high-quality connector that matches power.
Amass The fourth generation LC series power internal connector terminals and wiring harness are directly riveted and crimped. Compared with the traditional welding method, the problem of long-term exposure and oxidation of welding joints is solved. The current covers 10A-300A, and the clear positive and negative electrode markings and the reverse plug-in buckle design avoids the problem of opposite polarity in the plug-in circuit.
inverter connector details please refer to: https://www.china-amass.com
