Device for interrupting non-short circuit currents only, in particular disconnector or earthing switch
The present invention relates to a device for interrupting non-short circuit currents only, and in particular relates to a disconnector, more particularly high voltage disconnector, or to an earthing switch, more particularly make-proof earthing switch, and further relates to a low voltage circuit breaker. The device comprises at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present. According to the application, a counter-arcing component is allocated to the arcing region, the counter-arcing component being designed for counteracting the generation of an arc and/or being designed for supporting the extinction of an arc.
1. A device for interrupting non-short-circuit currents only, the device comprising:
at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present, wherein
a counter-arcing component is allocated to the arcing region and is designed for counteracting the generation of the arc and/or is designed for supporting extinction of the arc,
a first contact of the at least two contacts being in the form of a piston,
a second contact of the at least two contacts being in the form of a cylinder,
the first contact being contained by the second contact,
the first contact being slideably moveable in the cylinder,
the piston comprising a front end facing the other contact and a resistive element in a region of the front end sandwiched in an axial direction of the piston between two regions of a material of lower resistance than the resistive element.
2. The device according to claim 1 , wherein the arc-quenching medium further comprises air or at least one air component.
3. The device according to claim 2 , wherein the arc-quenching medium comprises a mixture of carbon dioxide and oxygen.
4. The device according to claim 3 , wherein the ratio of the amount of carbon dioxide to the amount of oxygen ranges from 50:50 to 100:1.
5. The device according to claim 1 , wherein the organofluorine compound is selected from the group consisting of: fluoroethers, fluoroolefins, and fluoronitriles, and mixtures thereof.
6. The device according to claim 1 , wherein the arc-quenching medium comprises a fluoroketone containing from four to twelve carbon atoms.
7. The device according to claim 1 , wherein the arc-quenching medium comprises a hydrofluoromonoether containing at least three carbon atoms.
8. The device according to claim 1 , wherein the device is a high voltage disconnector designed for bus charging.
9. The device according to claim 1 , wherein the device is an earthing switch of a high voltage disconnector designed for induced current switching.
10. The device according to claim 1 , wherein the device is a high voltage disconnector designed for bus transfer switching.
11. The device according to claim 1 , wherein the device is different from a circuit breaker, which circuit breaker is capable of interrupting short-circuit currents.
12. The device according to claim 1 , further comprising means for interrupting the non-short-circuit currents.
13. The device according to claim 1 , wherein the non-short-circuit currents are currents that flow from an electrical network to ground via unintended or intended paths and last longer than 3 seconds.
14. A medium voltage or high voltage gas-insulated switchgear comprising a device according to claim 1 .
15. The device according to claim 8 , wherein the high voltage disconnector is rated for a current in the range from 0.1 A to 0.8 A and a voltage in the range from 7.25 kV to 800 kV.
16. The device according to claim 1 , wherein the device is unable to interrupt short-circuit currents.
17. The device according to claim 1 , wherein the device does not have means for interrupting short-circuit currents.