Current limiting sparkgap with means for regulating gap voltage
阅读：276发布：2023-12-24
专利汇可以提供Current limiting sparkgap with means for regulating gap voltage专利检索，专利查询，专利分析的服务。并且A surge voltage arrester, such as a lightning arrester, is provided with a sparkgap assembly having a plurality of matched pairs of arc-confining chambers that are operable to regulate movement of arcs formed within the chambers of the assembly to prevent the assembly from developing undesirably high peak voltages when a surge voltage is discharged through it, and also to maintain the arc-quenching voltage rating of the assembly at a substantially constant value following repeated surge current discharges. A narrow passageway is provided between each of the matched pairs of arc-confining chambers in order to allow smallcurrent arcs to move between the two chambers while confining large-current arcs to a single one of the chambers, thus, one of the chambers is protected from exposure to destructive erosion and contamination by large-current arcs.，下面是Current limiting sparkgap with means for regulating gap voltage专利的具体信息内容。
1. A sparkgap assembly comprising an electrically insulating housing having a plurality of pairs of arc extinguishing chambers therein, each of said pairs of chambers comprising a first chamber and a second chamber and means defining a single narrow passageway therebetween, a plurality of pairs of electrodes, each of said pairs of electrodes being mounted in spaced-apart relationship respectively in one of said first chambers thereby to form a sparkgap in each of said first chambers between the pair of electrodes mounted therein, first circuit means electrically connecting all of said pairs of electrodes in series to form a discharge path including each of said sparkgaps between the endmost electrodes, second circuit means for electrically connecting said endmost electrodes across a voltage source whereby a surge voltage can be applied to said discharge path to sparkover said sparkgaps and form arcs in each of said first chambers, arc driving means for lengthening the arcs formed in said second chambers and for mOving said lengthened arcs into said second chambers, said narrow passageways between each of the first and second chambers being operable to prevent arcs in excess of a predetermined thickness from entering said second chambers thereby to cause relatively thick, large current, arcs to be confined to the first chambers, each of said first chambers being arranged with respect to its paired second chamber to prevent a major portion of the molten particles formed by large current arcs in said first chamber from entering said second chambers and to maintain a cool surface area within said second chambers whereby the arc quenching capability of said second chambers is maintained substantially constant during and after the discharge of a plurality of large current arcs through the sparkgap assembly.
2. A sparkgap assembly as defined in claim 1, wherein each of said electrodes includes an arc-running surface, said arc-running surfaces of each pair of electrodes being arranged to define a horngap that extends outward from the sparkgap formed between the electrodes generally toward the narrow passageway between the first chamber in which the electrodes are mounted to its paired second chamber, each of said first chambers including means defining a pair of walls that extend respectively from points adjacent the outer ends of said arc-running surfaces, each of said walls including a generally straight arc-cooling surface, said generally straight surfaces being arranged at acute angles with respect to a line extending between said passageway and the sparkgap whereby an arc that is forced against said surfaces is formed into a loop that peaks at the entrance of said passageway.
3. A sparkgap assembly as defined in claim 2 wherein the outer portions of said arc-running surfaces on the horngap forming electrodes are spaced away from the respective generally straight arc-cooling surfaces of said walls at their closest points thereto a substantially equal distance, and said substantially equal distance is smaller than the width of said passageway between said points on opposite sides thereof adjacent which said generally straight surfaces extend outward toward the ends of said arc-running surfaces on he electrodes.
4. A sparkgap assembly as defined in claim 2 wherein each of said second chambers includes means defining a generally arcuate outer wall portion and a pair of generally straight inner walls, said inner walls being arranged to extend respectively from points adjacent opposite sides of the end of said passageway furthest from the first chamber to points adjacent the ends of said arcuate outer wall portion.
5. A sparkgap assembly as defined in claim 4 wherein said generally straight inner walls of the second chamber converge on a plane extending through the sparkgap and passageway at acute angles that are within the same 90* quadrants with respect to an axis formed by said plane and a perpendicular line through it as are said generally straight arc-cooling surfaces of said first chamber, whereby said inner walls are shielded from molten, arc-developed particles that are thrown into the second chambers through said passageways and from most of the heating,when large current arcs are formed in the first chambers.
6. A sparkgap assembly as defined in claim 2wherein the arc-cooling surfaces of the first chamber are shorter in combined length than the arc-quenching surfaces of said second chamber.
7. A sparkgap assembly as defined in claim 6 wherein said second chamber includes a generally arcuate outer wall portion having a plurality of arc-stretching teeth disposed along the periphery thereof and extending into the chamber.
8. A sparkgap assembly as defined in claim 1, each of said first and second chambers include means defining generally arcuate walls for cooling and quenching arcs forced against them, the walls in each of said first and second chambers having arc-stretching teeth disposed along the peripheries thereof and extending toward the respective interIors of said chambers, said teeth in the first chambers being spaced substantially closer together than are the teeth in the second chambers, whereby it is easier for an arc of a given size to be forced against the walls between teeth in the second chambers than to be forced against the walls between teeth in the first chambers.
9. A sparkgap assembly as defined in claim 1 including means defining a second narrow passageway between each of said pairs of first and second chambers, and wall means mounted in said second chamber to subdivide it into at least two sub-chambers, whereby an arc forced into said second chamber is forced to form at least two extended loops that are positioned respectively in said sub-chambers.
10. A sparkgap assembly as defined in claim 7 wherein said second arc-confining chamber is shorter in vertical height than said first arc-confining chamber, thereby to cause arcs forced into said second chamber to be rapidly cooled due to their contact with the floor and ceiling surfaces of said second chamber.
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