A ground grid in a substation is a network of interconnected conductors buried beneath the substation surface. Its primary purpose is to provide a low-impedance path for fault currents to return to the source, ensuring rapid operation of protective devices and minimizing the risk of electrical shock. It achieves this by limiting ground potential rise (GPR) during fault conditions and by reducing step and touch potentials within the substation. Ground potential rise is the increase in the electrical potential of the ground grid relativ....
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