Hotovoltaic Solar Fire Protection Quick Switch Protection Rapid
Shutdown
Quick switch Roof PV1~10 Strings Available new energy home
Residential Factory Solar panel Electric fire safety switch
With the implementation of the county-wide promotion process,
photovoltaic power stations increased significantly. Due to the
complexity of the installation environment, the risk of fire is
high. More than 80% of power stations catch fire because of faults
on the DC side. If the DC high voltage cannot be turned off, there
will be hidden dangers of electric shock on the spot.
Therefore, before the fire response, the power station operation
and maintenance personnel need to shut off the photovoltaic system
and cut off the power supply to ensure the safety of firefighters
and the stability of the power grid. The quick Turn-off (RSD)
function was created.
01 What is Rapid Shutdown (RSD)?
Rapid Shutdown (RSD) is the concept of photovoltaic power station
safety protection proposed by the National Electrical Code (NEC) of
the United States.
In some countries, including Australia, Germany and the United
States, with the increase in photovoltaic systems, more and more
firefighters are requiring the installation of "fire switches" to
reduce the risk of electric shock when operating in photovoltaic
systems.
As early as 2014, the United States published the NEC2014 690.12
"component-level self-shutdown solutions" standard, which requires
rapid shutdown of photovoltaic systems.
Photovoltaic systems must be capable of quick shut-off in
accordance with the NEC690.12-2017 regulation. With the distance to
the photovoltaic matrix 305mm as the limit, within 30 seconds after
the quick turn-off device starts, the voltage outside the limit
range is reduced to below 30V, and the voltage within the limit
range is reduced to below 80V, which requires the realization of
"component-level turn-off".
02
Why is rapid Turn-off (RSD) important?
Due to the photovoltaic system is electrically charged equipment,
power voltage is higher, and the equipment and circuit current
always exist, the photovoltaic system in the fire accident in the
past, even shut down the grid power supply, and the inverter
automatically closed, from components to the inverter wire still
charged or controller, dc high voltage to the personal safety is a
huge hidden trouble.
In case of emergency, the quick shutdown (RSD) function reduces the
component voltage to the safe voltage, realizing the quick shutdown
of the component level, providing higher personal safety protection
for the owner, installation operation and maintenance personnel,
and firefighters.
