Integral fuse and switch support for metal-enclosed switch gear
阅读：75发布：2021-01-30
专利汇可以提供Integral fuse and switch support for metal-enclosed switch gear专利检索，专利查询，专利分析的服务。并且High voltage pad-mounted switch gear is provided for three phase loop feeder circuits and fused load circuits. The loop circuits are interconnected by series-connected loop feeder switches. Isolator switches of the telescoping bayonet type are connected between the loop circuit and the fuses. One end of the isolator switch and one end of the fuse are supported by a molded insulator strut. The molded insulator strut has a first hollow turret projection for guiding and supporting one end of the fuse and a second hollow turret projection for supporting the isolator switch. The turret projections enclose the connection between the fuse and the isolator switch thereby providing greater isolation and insulation between the phases of the loop circuits. A tool is provided for removing and inserting the fuse. An interlocking blocking arrangement prevents access to the fuse by the tool until the isolator switch has opened the circuit to the fuse thereby preventing injury to the serviceman and damage to the equipment.，下面是Integral fuse and switch support for metal-enclosed switch gear专利的具体信息内容。
1. In a metal-enclosed circuit switching arrangement comprising feeder circuit conductors for providing a source of electrical power, load circuit conductors to an electrical load, a metal housing enclosing said conductors, whereby the improvement comprises: a fuse having first and second ends; a stationary fuse contact means mounted in the housing for disengageably engaging the first end of the fuse, a load circuit conductor being connected to said stationary fuse contact means; isolator switch means mounted in the housing, a feeder circuit conductor being electrically connected to said isolator switch means; a molded plastic insulator strut comprising: first and second hollow turrets, said first turret being essentially aligned with said stationary fuse contact means; guide means within said first turret for electrically engaging the second end of said fuse when the first end of said fuse engages said stationary fuse contact means; switch contact means within said second turret for engaging and supporting said isolator switch means; means for electrically interconnecting said guide means and said switch contact means so that an electrical circuit is completed between the feeder cIrcuit connector and the load connector when said fuse is engaged by said stationary contact means and said guide means, and said isolator switch means is closed.
2. An improvement, as claimed in claim 1, further comprising: an insulated tool means for engaging the second end of said fuse so that said tool means can be actuated to disengage said fuse from said stationary fuse contact means and said guide means so that said fuse can be removed for testing and replacement.
3. An improvement, as claimed in claim 2, further comprising: blocking means for preventing access to said fuse by said tool means until said isolator switch means is opened so that said fuse cannot be removed until the electrical circuit from the feeder circuit conductor to said fuse is broken.
4. An improvement, as claimed in claim 1, wherein said isolator switch means comprises: a linear reciprocating contact arm slidably mounted and supported by said turret contact means in said second turret, said contact arm being movable between a first and a second position; a stationary switch contact mounted in line with said contact arm so that said contact arm electrically connects said stationary switch contact when said contact arm is in its first position and electrically disconnects said stationary switch contact when said contact arm is in its second position.
5. An improvement, as claimed in claim 4, wherein said contact arm further comprises: a contact member attached to the end of said contact arm; a trailer member attached to the end of said contact member formed of a material capable of producing an arc quenching gas when exposed to an electrical arc.
6. An improvement, as claimed in claim 5, wherein said stationary switch contact further comprises: a hollow receptacle for receiving said contact member and said trailer; an annular contact within said hollow receptacle for electrically engaging said contact member said annular contact being connected to the feeder circuit conductor; a muffler means communicating with said hollow receptacle for exhausting and cooling any gases created by arc formation as said annular contact and contact member disengage and engage under electrical load.
7. An improvement, as claimed in claim 2, further comprising: a load-break connecter connected between said stationary contact and the load circuit conductor, said load-break connecter being disconnectable from said stationary fuse contact means to break the electrical circuit to the electrical load.
8. An improvement, as claimed in claim 7, further comprising blocking means operably connected to said load-break connecter for preventing access to said fuse by said tool means until said load-break connecter is disconnected from said stationary fuse contact means.
9. An improvement, as claimed in claim 8, wherein said blocking means further comprises: interconnecting means for preventing access to said fuse by said tool until said isolator switch means interrupts the circuit to the feeder circuit conductor.
10. An improvement, as claimed in claim 3, further comprising: a panel member positioned adjacent said molded plastic insulator strut inside a door of the metal housing, said panel member having openings in line with said first turrets dimensioned to permit said tool to be inserted through said openings, and said blocking means comprises cover means for covering said openings to prevent insertion of said tool and uncovering said openings in response to said isolator switch means interrupting the circuit between the feeder circuit conductor and said fuse.
11. An improvement, as claimed in claim 1, wherein said fuse comprises: a cylindrical housing having contact engaging means at the first end thereof for disengageably engaging the stationary fuse contact means, said cylindrical housing dimensioned to be accepted and guided by said guide means in said first turret so that when said fuse is inserted into said guide meaNs said engaging means is aligned with stationary contact means and will engage said stationary fuse contact means when the second end of said fuse electrically engages said guide means.
12. An improvement, as claimed in claim 2, wherein said tool means comprises a hollow end portion for receiving an engaging the second end of the fuse and a handle means opposite the hollow end portion.
13. An improvement, as claimed in claim 1, wherein said fuse engages said stationary fuse contact means with a twist lock action.
14. In a pad-mounted metal-enclosed loop circuit switching arrangement comprising a loop electric power supply circuit conductor adapted to be energized from either or both ends, first and second loop feeder switches connected in series to said loop circuit conductor, series conductor means connecting said loop feeder switches in series whereby on closure thereof the loop circuit extends therethrough, a metal housing enclosing the first and second loop feeder switches and the series conductor means having doors therein to permit access to the interior of the housing, an electrical load, and a conductor from the load to the housing; wherein the improvement comprises: a fuse having first and second ends; a stationary fuse contact means mounted in the housing for disengageably engaging the first end of the fuse, the conductor from the load being connected to said stationary fuse contact means; isolator switch means being connected to the series conductor means for interrupting a circuit to said series conductor means; a molded plastic insulator strut comprising: first and second hollow turrets, said first turret being essentially aligned with said stationary fuse contact means; guide means within said first turret for electrically engaging the second end of said fuse when the first end of said fuse engages said stationary fuse contact means; turret contact means within said second turret for engaging and supporting said isolator switch means; means for electrically interconnecting said guide means and said turret contact means so that an electrical circuit is completed to the load when said fuse is engaged by said stationary contact means and said guide means, and said isolator switch means is closed.
15. An improvement, as claimed in claim 14, further comprising: an insulated tool means for engaging the second end of said fuse so that said tool means can be actuated to disengage said fuse from said stationary fuse contact means and said guide means so that said fuse can be removed for testing and replacement.
16. An improvement, as claimed in claim 15, further comprising: blocking means for preventing access to said fuse by said tool means until said isolator swtich means is opened so that said fuse cannot be removed until the electrical circuit from the loop circuit to said fuse is broken.
17. An improvement, as claimed in claim 14, wherein said isolator switch means comprises: a linear reciprocating contact arm slidably mounted and supported by said turret contact means in said second turret, said contact arm being movable between a first and a second positions; a stationary switch contact mounted in line with said contact arm so that said contact arm electrically connects said stationary switch contact when said contact arm is in its first position and electrically disconnects said stationary switch contact when said contact arm is in its second position.
18. An improvement, as claimed in claim 17, wherein said contact arm further comprises: a contact member attached to the end of said contact arm; a trailer member attached to the end of said contact member formed of a material capable of producing an arc quenching gas when exposed to an electrical arc.
19. An improvement, as claimed in claim 18, wherein said stationary switch contact further comprises: a hollow receptacle for receiving said contact member and said trailer; an annular contact within said Hollow receptacle for electrically engaging said contact member; a muffler means communicating with said hollow receptacle for exhausting and cooling any gases created by arc formation as said annular contact and contact member disengage and engage under electrical load.
20. An improvement, as claimed in claim 15, further comprising: a load-break connecter connected between said stationary contact and the electrical load, said load-break connecter being disconnectable from said stationary fuse contact means to break the electrical circuit to the electrical load.
21. An improvement, as claimed in claim 20, further comprising blocking means operably connected to said load-break connecter for preventing access to said fuse by said tool means until said load-break connecter is disconnecter from said stationary fuse contact means.
22. An improvement, as claimed in claim 21, wherein said blocking means further comprises: interconnecting means for preventing access to said fuse by said tool until said isolator switch means interrupts the circuit to said series conductor means.
23. An improvement, as claimed in claim 16, further comprising: a panel member positioned adjacent said molded plastic insulator strut inside one of the doors of the metal housing said panel member having openings in line with said first turrets dimensioned to permit said tool to be inserted through said openings, and said blocking means comprises cover means for covering said openings to prevent insertion of said tool and uncovering said openings in response to said isolator switch means interrupting the circuit between the series conductor means and said fuse.
24. An improvement, as claimed in claim 14, wherein said fuse comprises: a cylindrical housing having contact engaging means at the first end thereof for disengageably engaing the stationary fuse contact means, said cylindrical housing being dimensioned to be accepted and guided by said guide means in said first turret so that when said fuse is inserted into said guide means said engaging means is aligned with said stationary contact means and will engage said stationary fuse contact means when the second end of said fuse electrically engages said guide means.
25. An improvement, as claimed in claim 15, wherein said tool means comprises a hollow end portion for receiving and engaging the second end of the fuse and a handle means opposite the hollow end portion.
26. An improvement, as claimed in claim 14, wherein said fuse engages said stationary fuse contact means with a twist lock action.
27. In a metal-enclosed circuit switching arrangement comprising feeder circuit conductors for providing a source of electrical power, load circuits conductors to an electrical load, a metal housing enclosing said conductors, whereby the improvement comprises: a removable conductor means having first and second ends; a stationary contact means mounted in the housing for disengageably engaging the first end of the conductor means, a load circuit conductor being connected to said stationary contact means; isolator switch means mounted in the housing, a feeder circuit conductor being electrically connected to said isolator switch means; a molded plastic insulator strut comprising: first and second hollow turrets, said first turret being essentially aligned with said stationary contact means; guide means within said first turret for electrically engaging the second end of said conductor means when the first end of said conductor means engages said stationary contact means; switch contact means within said second turret for engaging and supporting said isolator switch means; and means for electrically interconnecting said guide means and said switch contact means so that an electrical circuit is completed between the feeder circuit connector and the load connector when said conductor means is engaged by said stationary contact means and said guide means, and said isolatoR switch means is closed.
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