In high-voltage networks tower configurations are sometimes used with more than one system being mounted on the same line tower. In such cases, induced currents have to be switched when earthing or unearthing one of the lines whilst the other line is connected to the system and may be carrying load current. The magnitude of the induced currents to be switched by the earthing switch depends on the capacitive and inductive coupling factors between the lines, and on the voltage, load and length of the parallel system. Earthing switches applied to earth these lines should therefore be capable of assuring making and breaking of a capacitive/inductive currents and carrying continuously the capacitive and inductive currents. ABB can provide the earthing switch with induced current switching capability.
High Voltage Products
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