A transient overvoltage protection system to be positioned in parallel with an equipment item to be protected, has at least three lines and includes three conductive branches intended to be connected to the three lines. The first and second conductive branches are equipped with first and second voltage-sensitive protection elements and are able to rise in temperature when the voltage between its terminals is higher than a voltage threshold. A thermally sensitive disconnection device comprising at least one thermofusible element in thermal contact with at least one of the first and second protection elements, is arranged so as to keep the three branches in a connected position, the thermally sensitive disconnection device having an elastic return device exerting a force tending to bring the three conductive branches to a disconnected position.

A wind turbine is provided, having a nacelle, and having a rotor that has at least two rotor blades. The rotor blades each have a rotor blade root, at least one metallic conductor, for conducting a lightning strike, and connected thereto, provided in the region of a rotor blade root, have a conducting ring. In addition, a lightning protection unit is fastened to the non-rotating part of the nacelle in such a manner that the lightning protection unit lies on the ring. The lightning protection unit has two rollers and a lightning rod, a free end of the lightning rod being separated from an outer end of the rollers by a distance that defines a spark gap.

An electro-static discharge protection structure adapted to be utilized in an electronic device is provided. The electronic device includes a housing, a printed circuit board, and a connector. The electro-static discharge protection structure includes a first discharge circuit and a discharge device. The first discharge circuit is electrically connected to the housing. The discharge device is connected to the first discharge circuit. The discharge device includes a discharge plate which includes a plurality of charge entry points and a plurality of charge exit points. The connector is disposed between the discharge device and the printed circuit board. An electronic device including the electro-static discharge protection structure is also provided.

A transient overvoltage protection system to be positioned in parallel with an equipment item to be protected, has at least three lines and includes three conductive branches intended to be connected to the three lines. The first and second conductive branches are equipped with first and second voltage-sensitive protection elements and are able to rise in temperature when the voltage between its terminals is higher than a voltage threshold. A thermally sensitive disconnection device comprising at least one thermofusible element in thermal contact with at least one of the first and second protection elements, is arranged so as to keep the three branches in a connected position, the thermally sensitive disconnection device having an elastic return device exerting a force tending to bring the three conductive branches to a disconnected position.

This disclosure concerns a method for preventing an electrical grid from a failure in case of a temporary overvoltage. The method comprising the following steps: a) providing an electrical grid line (139), a surge arrester (140) and a disconnector device (10, 100) with a disconnector unit (25); b) connecting the surge arrester at one terminal to the electrical grid line (139); c) connecting the surge arrester at its other terminal to a second terminal of the disconnector device; d) connecting a first terminal (30) of the disconnector device to ground potential (37); e) interrupting the electrical connection in between the electrical grid line (139) and the ground potential (37) in case of a temporary overvoltage; f) protecting the surge arrester from failure due to a thermal overload caused by the temporary overvoltages by operating the disconnector device (10, 100) before the surge arrester fails due to a thermal overload of the surge arrester (140).

This disclosure concerns a method for preventing an electrical grid from a failure in case of a temporary overvoltage. The method comprising the following steps: a) providing an electrical grid line (139), a surge arrester (140) and a disconnector device (10, 100) with a disconnector unit (25); b) connecting the surge arrester at one terminal to the electrical grid line (139); c) connecting the surge arrester at its other terminal to a second terminal of the disconnector device; d) connecting a first terminal (30) of the disconnector device to ground potential (37); e) interrupting the electrical connection in between the electrical grid line (139) and the ground potential (37) in case of a temporary overvoltage; f) protecting the surge arrester from failure due to a thermal overload caused by the temporary overvoltages by operating the disconnector device (10, 100) before the surge arrester fails due to a thermal overload of the surge arrester (140).

The invention relates to an encapsulated surge protection device capable of carrying lightning currents and limiting follow currents and comprising at least one spark gap, which has in each case at least two main electrodes and one auxiliary electrode, which is connected to a starting device for triggering in the event of transient surges. The invention provides a second starting device which is independent of the first starting device and which can activate the spark gap without the need for the presence of surges or pulse currents on the basis of the presence of a minimum voltage between the main electrodes of the spark gap.

An arrester bypass device can include a switch having an normal state and an operated state. The arrester bypass device can also include a first electrode mechanically coupled to the switch, where the first electrode is held when the switch is in the normal state and released when the switch is in the operated state. The arrester bypass device can also include a second electrode positioned in line with the first electrode, wherein the first electrode contacts the second electrode when the switch is in the operated state. The arrester bypass device can further include a ground strap having a first end and a second end, where the first end is mechanically coupled to the plunger, and where the second end is mechanically coupled to an electrical ground.