Abstract: System for surge protection of an object comprising a supply unit, which is connected to the secondary output of an external transformer. The secondary windings of the external transformer are coupled in a star configuration, the star point of the transformer being connected to a downstream neutral conductor and an earth electrode provided near to the transformer. In the supply unit, at least one phase conductor is connected to the neutral conductor by means of a surge protective device of a first type, and the neutral conductor is connected to an earth electrode provided near to the supply unit by means of a surge protective device of a second type. The surge protective device of the first type comprises a voltage dependent resistor or varistor and the surge protective device of the second type comprises a lightning current arrester or spark gap element.

Abstract: System for surge protection of an object comprising a supply unit, which is connected to the secondary output of an external transformer. The secondary windings (1) of the external transformer are coupled in a star configuration, the star point of the transformer being connected to a downstream neutral conductor (7) and an earth electrode provided near to the transformer. In the supply unit, at least one phase conductor (6) is connected to the neutral conductor (7) by means of a surge protective device of a first type (4), and the neutral conductor (7) is connected to an earth electrode (5) provided near to the supply unit by means of a surge protective device of a second type (9). The surge protective device of the first type (4) comprises a voltage dependent resistor or varistor and the surge protective device of the second type (9) comprises a lightning current arrester or spark gap element.

Abstract: System for surge protection of an object comprising a supply unit, which is connected to the secondary output of an external transformer. The secondary windings (1) of the external transformer are coupled in a star configuration, the star point of the transformer being connected to a downstream neutral conductor (7) and an earth electrode provided near to the transformer. In the supply unit, at least one phase conductor (6) is connected to the neutral conductor (7) by means of a surge protective device of a first type (4), and the neutral conductor (7) is connected to an earth electrode (5) provided near to the supply unit by means of a surge protective device of a second type (9). The surge protective device of the first type (4) comprises a voltage dependent resistor or varistor and the surge protective device of the second type (9) comprises a lightning current arrester or spark gap element.