Over-voltage protection arrangement having a horn gap located in an insulating housing having a deionization chamber for arc extinguishing
The invention relates to an overvoltage protection arrangement comprising a horn spark gap located in an insulating housing, with a deionization chamber for arc quenching, wherein the deionization chamber has a plurality of spaced quench plates and a trigger electrode is located in the ignition region of the horn spark gap, wherein a disconnecting device comprises a fusible link that is located in the region of the deionization chamber and is exposed there to a loading of a power follow-on current, wherein the fusible link holds a disconnecting element, preferably supported by spring force, in a first position, and on melting releases this disconnecting element in such a way that the disconnecting element adopts a second position wherein, on reaching the second position, an electrical connection to the trigger electrode is interrupted and the trigger electrode is thereby disconnected.
1. An overvoltage protection arrangement comprising a horn spark gap located in an insulating housing, with a deionization chamber ( 4 ) for arc quenching, wherein the deionization chamber ( 4 ) has a plurality of spaced quench plates ( 9 ) and a trigger electrode ( 7 ) is located in the ignition region of the horn spark gap,
characterized in that
a disconnecting element ( 6 ) is provided that interrupts a connection between a trigger circuit ( 2 ) and the trigger electrode, and thus disconnects the trigger electrode ( 7 ), wherein the disconnecting element ( 6 ) is tripped or controlled by an evaluation unit ( 5 ) that is located in the region of the deionization chamber.
2. The overvoltage protection arrangement as claimed in claim 1 ,
characterized in that
the trigger electrode ( 7 ) is connected via a voltage-limiting or voltage-switching element to one of the main electrodes ( 30 ) of the horn spark gap ( 1 ), and this connection can be interrupted by means of the disconnecting element ( 6 ).
3. An overvoltage protection arrangement comprising a horn spark gap located in an insulating housing, with a deionization chamber ( 4 ) for arc quenching, wherein the deionization chamber ( 4 ) has a plurality of spaced quench plates ( 9 ) and a trigger electrode ( 7 ) is located in the ignition region of the horn spark gap ( 1 ), characterized in that a disconnecting device comprises a fusible link ( 5 ; 8 ; 81 ) that is located in the region of the deionization chamber ( 4 ) and is exposed there to the loading of a power follow-on current, wherein the fusible link ( 5 ; 8 ; 81 ) holds a disconnecting element ( 6 ) in a first position, and on melting releases this disconnecting element ( 6 ) in such a way that the disconnecting element ( 6 ) adopts a second position wherein, on reaching the second position, an electrical connection to the trigger electrode ( 7 ) is interrupted and the trigger electrode ( 7 ) is thereby disconnected.
4. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the trigger electrode ( 7 ) is connected via a voltage-limiting or voltage-switching element to one of the main electrodes ( 30 ; 31 ) of the horn spark gap ( 1 ), and this connection can be interrupted by means of the disconnecting element ( 6 ).
5. The overvoltage protection arrangement as claimed in claim 4 ,
characterized in that
the voltage-switching element is designed as a gas arrester.
6. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the disconnecting element is arranged laterally next to the deionization chamber ( 4 ) and is designed as a slider.
7. The overvoltage protection arrangement as claimed in claim 6 ,
characterized in that
with the fusible link ( 8 ) partially routed outside the deionization chamber ( 4 ) for activation of the disconnecting element ( 6 ), inflow openings or inflow channels ( 18 ) for a plasma resulting from the formation of an external arc are formed.
8. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the fusible link ( 8 ; 81 ) is contacted by spaced quench plates ( 9 ) of the deionization chamber ( 4 ).
9. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the fusible link ( 81 ) is arranged in the arc inlet region ( 13 ) of the deionization chamber ( 4 ; 9 ).
10. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the disconnecting element ( 6 ) can also be tripped by a fusible link ( 8 ) that is located in the space ( 10 ) that is present above an ignition region of the horn spark gap ( 1 ).
11. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the fusible link ( 8 ) is connected to one of the running rails or horn electrodes ( 30 ; 31 ) of the spark gap ( 1 ).
12. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the disconnecting element is arranged largely within the deionization chamber ( 4 ).
13. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the fusible link ( 81 ) is arranged without electrical potential in the arc inlet region or the deionization chamber ( 4 ).
14. The overvoltage protection arrangement as claimed in claim 3 ,
characterized in that
the fusible link ( 8 ; 81 ) is fastened in a thermally sensitive manner.
15. The overvoltage protection arrangement as claimed in claim 3 , wherein the fusible link ( 5 ; 8 ; 81 ) holds a disconnecting element ( 6 ), supported by spring force.
16. An overvoltage protection arrangement comprising a horn spark gap located in an insulating housing, with a deionization chamber ( 4 ) for arc quenching, wherein the deionization chamber ( 4 ) has a plurality of spaced quench plates ( 9 ) and a trigger electrode ( 7 ) is located in the ignition region of the horn spark gap ( 1 ), characterized in that a disconnecting device comprises a fusible link ( 8 ) that is located in the region of the deionization chamber ( 4 ) and is exposed there to a loading of a power follow-on current, wherein the fusible link ( 8 ) holds a slider-like disconnecting element ( 15 ) in a first position, and on melting releases this disconnecting element ( 15 ) in such a way that the disconnecting element ( 15 ) adopts a second position wherein, on reaching the second position, an electrical switching connection to the trigger electrode ( 7 ) is interrupted and the trigger electrode ( 7 ) is thereby disconnected.
17. The overvoltage protection arrangement as claimed in claim 16 ,
characterized in that
the trigger electrode ( 7 ) is connected via a voltage-limiting or voltage-switching element to one of the main electrodes ( 30 ) of the horn spark gap ( 1 ), and this connection can be interrupted by means of a disconnecting device ( 6 ) designed as a switch.
18. The overvoltage protection arrangement as claimed in claim 16 ,
characterized in that
the fusible link ( 8 ) is contacted by spaced quench plates ( 9 ) of the deionization chamber ( 4 ).
19. The overvoltage protection arrangement as claimed in claim 16 ,
characterized in that
a further slider ( 17 ) is provided, which interrupts the switching connection to the trigger electrode ( 7 ) independently of the state of the fusible link ( 8 ).
20. The overvoltage protection arrangement as claimed in claim 19 ,
characterized in that
the slider ( 17 ) responds to surge loading or the loading of the voltage-limiting or voltage-switching element ( 2 ).
21. The overvoltage protection arrangement as claimed in claim 15 , wherein the fusible link ( 8 ) holds a slider-like disconnecting element ( 15 ), supported by spring force.