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constantly changes the charge state of the parasitic PV capacitor (i.e. capacitance to PE). This
is associated with a displacement current, which is proportional to the capacitance and the
applied voltage amplitude.
- Residual current-if there is a fault, such as defective insulation, where an energized cable
comes into contact with a grounded person, an additional current flows, known as a residual
current.
Residual Current Device (RCD)
- All FOXESS hybrid inverters incorporate a certified internal RCD (Residual Current Device) to
protect against possible electrocution in case of a malfunction of the PV array, cables or inverter
(DC). The RCD in the FOXESS inverter can detect leakage on the DC side. There are 2 trip
thresholds for the RCD as required by the UL1741 standard. A low threshold is used to protect
against rapid changes in leakage typical of direct contact by people. A higher threshold is used
for slowly rising leakage currents, to limit the current in grounding conductors for the safety. The
default value for higher speed personal protection is 30mA, and 30mA, 60mA, 150mA per unit
for lower speed fire safety.
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