Pe Connection And Leakage Current - Atronix AX Series User Manual

User Manual
a-TroniX Inverter AX-series, 3 ph
• Do not use the equipment when the safety devices do not work or are disabled.
• Use personal protective equipment, including gloves and eye protection during
the installation.
• Inform the manufacturer about non-standard installation conditions.
• Do not use the equipment if any operating anomalies are found.
Avoid temporary repairs.
• All repairs should be carried out using only approved spare parts, which must be
installed in accordance with their intended use and by a licensed contractor or
authorized service representative.
• Liabilities arising from commercial components are delegated to their
respective manufacturers.
• Any time the inverter has been disconnected from the public network, please
be extremely cautious as some components can retain charge sufficient to
create a shock hazard. Prior to touching any part of the inverter please ensure
surfaces and equipment are under touch safe temperatures and voltage
potentials before proceeding.

2.2 PE Connection and Leakage Current

PV System Residual Current Factors
• In every PV installation, several elements contribute to the current leakage to
protective earth (PE). these elements can be divided into two main types.
• Capacitive discharge current - Discharge current is generated mainly by
the parasitic capacitance of the PV modules to PE. The module type, the
environmental conditions (rain, humidity) and even the distance of the
modules from the roof can effect the discharge current. Other factors that may
contribute to the parasitic capacitance are the inverter's internal capacitance
to PE and external protection elements such as lighting protection.
• During operation, the DC bus is connected to the alternating current grid
via the inverter. Thus, a portion of the alternating voltage amplitude arrives
at the DC bus. The fluctuating voltage 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.
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