System for overvoltage protection

Details System for overvoltage protection System for overvoltage protection

2005-02-08

2005-02-08

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

C361S127000

Reexamination Certificate

active

06853529

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.

REFERENCES:
patent: 4455586 (1984-06-01), McCartney
patent: 5323289 (1994-06-01), Longsdorf et al.
patent: 6157529 (2000-12-01), Ahuja
Photograph of Carpaneto Turin Box, no date.
International Electrotechnical Commission, “Electrical installations of buildings—Part 5: Selection and erection of electrical equipment, Section 534: Devices for protection against overvoltages,” International Standard IEC 60364-5-534, First edition, Nov. 1997, pp. 1-10.

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