How to prevent electrical fires in distributed PV systems?

However, electrical fires — mainly caused by DC arcing — are the primary risk that needs to be prevented for distributed PV systems. Therefore, it is essential that comprehensive measures are employed, especially intelligent arc detection and rapid shutdown technologies, in order to improve the safety and control level of PV plants.

What is a PV rapid shutdown device (RSD)?

Among the various safety mechanisms, the PV Rapid Shutdown Device (RSD) has become a critical component, ensuring that solar installations can be quickly and safely de-energized in emergency situations.

Are photovoltaic systems dangerous to firefighters?

A joint industry study carried out in Germany (Fraunhofer ISE 2017) concluded that photovoltaic systems do not pose any special threat to firefighters, as long as the firefighters comply with the safety clearances. PV systems can be handled in the same way as any other electrically live equipment.

Are photovoltaic power systems safe?

According to the International Energy Agency Photovoltaic Power Systems Program (IEA PVPS), “PV systems do not pose health, safety or environmental risks under normal operating conditions if properly installed and maintained by trained personnel as required by electric codes.” (IEA PVPS 2017; p. 2).

How far away should PV inverters be placed?

By placing these smaller inverters within 10′ of the array that they are connected to, the PV system can meet the requirements of 690.12 and shutdown can be initiated upon loss of utility power without any remotely activated switches (see figure 8).

Can a PV system outperform a non-shaded PV system?

Consequently, as shown by the study done at the University of Southern Denmark, a PV system without “optimizers” typically outperforms a system with “optimizers” in non-shaded, and for most cases, even under shaded conditions. But unshaded systems are also affected by module mismatch that cannot be properly handled by string inverters.