The standard earthing system of a solar farm is as follows: The DC and AC sides of the system are galvanically (functionally) isolated. The DC side of the PV system may be either grounded or ungrounded. When it is grounded it is done at the ground fault protection device of the inverters.
Technical specifications of both the inverters has been mentioned below:- viii) The grid-connected inverters shall comply with UL 1741 standard. Power generated from the solar system during the day time is utilized fully by powering the all building loads and feeding excess power to the grid as long as grid is available.
An adequate earthing system for low, medium, and high voltage areas of the PV farm ensures energy under fault condition and system malfunction are absorbed without exceeding the desirable limits. The work in this paper captures the soil resistivity and the earthing system requirements for each voltage level.
Proposed design diagram for PV farm earthing system The aim of the diagram is to set the optimum steps for the design when it comes to PV solar farm earthing system. The diagram aid the designer to determine the required steps to ensure the system is compliant to safety and operational requirements.
The PV modules shall conform to the following standards:IS 14286: Crystalline silicon terrestrial photovoltai determine the resistance of PV Modules to Ammonia (NH3)The PV module should have IS14286 qualification certification for solar PV modules (Crystalline silicon terrestrial photovoltaic
The main earthing system consists of buried bare copper conductors and rods (note earthing rods are rarely beneficial for solar farms), along with the above-ground interconnected metal panel support structures, support posts and cable trays.