Electrical switchgear with primary and secondary switch means associated with current transformer

Abstract

Electrical switchgear comprising a stationary housing containing current inlet and outlet conductors forming elements of a primary high voltage circuit, a movable housing containing switching means for the primary circuit, mating primary supply contacts on said stationary and movable housings engageable when said movable housing in its operative position to connect said inlet and outlet conductors to said switching means, transformer means in said stationary housing, and a number of secondary circuits fed by said transformer means, wherein at least some of said secondary circuits are contained in said stationary housing and interacting means are provided between said housings for controlling those of said secondary circuits contained in said stationary housing in accordance with the state of said primary circuit switching means in said movable housing.

What I claim is: 
     
       1. Electrical switchgear, comprising: a. a stationary housing containing current inlet and outlet conductors forming elements of a primary high voltage circuit, transformer means, at least one secondary circuit fed by the transformer means and secondary switch means for controlling said secondary circuit.Iadd., and trip control means; .Iaddend.   b. a movable housing containing primary switching means for said primary circuit, said primary switching means including contacts movable between open and closed positions.Iadd., and a spring-operated circuit breaker for moving said contacts to the open position to break said primary circuit; .Iaddend.   c. mating primary supply contacts on said stationary housing and said movable housing, said primary supply contacts mating with each other when said movable housing is in an operative position relative to said stationary housing to connect said inlet and outlet conductors to said primary switching means;   d. .Iadd.a .Iaddend.movable mechanical transmission .[.elements.]. .Iadd.element .Iaddend.projecting from said movable housing;   e. means .[.coupling said transmission elements to said movable contacts.]. for controlling the position of said .Iadd.mechanical .Iaddend.transmission .[.elements.]. .Iadd.element .Iaddend.in accordance with the open and closed positions of said movable contacts of said primary switching means;   f. .Iadd.a .Iaddend.movable mechanical sensing .[.elements.]. .Iadd.element .Iaddend.projecting from said stationary housing and linked to operate said secondary switch means;   g. said sensing .[.elements.]. .Iadd.element .Iaddend.being juxtaposed with and engageable by said transmission .[.elements.]. .Iadd.element .Iaddend.when said movable housing is in said operative position whereby said secondary switch means is controlled in accordance with the open and closed positions of said movable contacts of said primary switching means through said .Iadd.mechanical .Iaddend.transmission .[.elements.]. .Iadd.element .Iaddend.and sensing .[.elements.]..Iadd.element;   h. a mechanical operating member projecting from said stationary housing and controlled to move between different positions by said trip control means;   i. a mechanical trip member projecting from said movable housing and movable for controlling operation of said circuit breaker;   j. said mechanical trip member being juxtaposed with and engageable by said mechanical operating member when said movable housing is in said operative position whereby in response to a signal from said trip control means said mechanical operating member moves said mechanical trip member causing operation of said circuit breaker.Iaddend..   
     
     
       2. Electrical switchgear according to claim 1 in which the axes of said primary supply contacts are horizontally disposed and said movable housing is movable horizontally into and out of said operative position. 
     
     
       3. Electrical switchgear according to claim 2 and including fixed rails extending from the stationary housing and wheels fitted to said movable housing and running on said rails. 
     
     
       4. Electrical switchgear according to claim 2 in which said stationary housing has a first section containing said inlet and outlet conductors and a second section projecting horizontally from said first section at such a height as to accommodate said movable housing beneath said second section when said movable housing is in said operative position, .Iadd.either or both of .Iaddend.said mechanical transmission .[.elements.]. .Iadd.element and said mechanical trip member .Iaddend.project upwardly from the upper surface of said movable housing and .Iadd.correspondingly either or both of .Iaddend.said mechanical sensing .[.elements.]. .Iadd.element and mechanical operating member .Iaddend.project downwardly from the lower surface of said second section of said stationary housing. .[.5. Electrical switchgear according to claim 1 in which said primary switching means includes a trip member projecting from said movable housing and a spring-operated circuit breaker coupled with said trip member to break said primary circuit on movement of said trip member, and said stationary housing includes a mechanical operating member juxtaposed with and engageable with said trip member when said movable housing is in said operative position, said mechanical operating member being movable in response to a signal on a secondary circuit in said stationary housing to move said trip member and so operate said circuit breaker..].  .[.6. Electrical switchgear according to claim 5 in which the axes of said primary supply contacts are horizontally disposed and said movable housing is movable horizontally into and out of said operative position, said stationary housing has a first section containing said inlet and outlet conductors and a second section projecting horizontally from said first section at such a height as to accommodate said movable housing beneath said second section when said movable housing is in said operative position, said trip member projects upwardly from the upper surface of said movable housing and said mechanical operating member projects downwardly from said lower surface of said second section of said 
     
     
        stationary housing..].  7. Electrical switchgear according to claim 1 in which said primary switching means comprises .Iadd.said movable contacts, .Iaddend.a mechanism for moving said movable contacts between said open and closed positions and a set of fixed contacts connected to respective ones of said primary supply contacts, said movable contacts and said .[.moving.]. mechanism.[.; the apparatus further comprising.]. .Iadd.being carried by .Iaddend.a frame which is removably mounted in said movable housing .[.and on which said movable contacts and mechanism for moving 
     
     
        these are mounted.].. 8. A stationary housing assembly for use in electrical switchgear, comprising a stationary housing containing current inlet and outlet conductors forming elements of a primary high voltage circuit, transformer means, .[.at least one.]. .Iadd.a .Iaddend.secondary circuit fed by the transformer means.Iadd., .Iaddend..[.and.]. secondary switch means for controlling said secondary circuit, .Iadd.and trip control means, .Iaddend.primary supply contacts on said stationary housing for mating with corresponding contacts on a movable housing when said movable housing is in an operative position relative to said stationary housing, .[.and.]. .Iadd.a .Iaddend.movable mechanical sensing .[.elements.]. .Iadd.element .Iaddend.projecting from said stationary housing and linked to operate said secondary switch means, said sensing .[.elements.]. .Iadd.element .Iaddend.being arranged for juxtaposition with and engagement by .Iadd.a .Iaddend.movable mechanical transmission .[.elements.]. .Iadd.element .Iaddend.projecting from said movable housing when said movable housing is in said operative position.Iadd.; and a mechanical operating member projecting from said stationary housing and controlled to move between different positions by said trip control means, said mechanical operating member being arranged for juxtaposition and engagement with a mechanical trip member projecting from said movable housing when said movable housing is in said operative position.Iaddend.. 
     
     
         . A stationary housing assembly according to claim 8 in which the housing comprises a first section containing the inlet and outlet conductors and a second section projecting horizontally from said first section at such a height as to accommodate said movable housing beneath said second section when said movable housing is in said operative position, and .Iadd.either or both of .Iaddend.said mechanical sensing .[.elements.]. .Iadd.element and said mechanical operating member .Iaddend.project downwardly from the lower surface of said second section. .[.10. A stationary housing assembly according to claim 8, further comprising a mechanical operating member projecting from said stationary housing and tripping means responsive to conditions requiring circuit breaking coupled to said operating member for moving said operating member in response to said circuit breaking conditions..].  .[.11. A stationary housing assembly according to claim 10 in which the housing comprises a first section containing the inlet and outlet conductors and a second section projecting horizontally from said first section at such a height as to accommodate said movable housing beneath said second section when said movable housing is in said operative position, and said mechanical sensing elements project downwardly from the lower surface of said second section, said tripping means is mounted in said second section and said mechanical operating member projects 
     
     
        downwardly from the lower surface of said second section..].  12. A movable housing assembly for use in electrical switchgear, comprising a movable housing containing primary switching means for a primary high voltage electrical circuit, said primary switching means including contacts movable between open and closed positions, .Iadd.a spring-operated circuit breaker for moving said contacts to the open position to break said primary circuit, .Iaddend.primary supply contacts for mating with corresponding contacts on a stationary housing when the movable housing is in an operative position adjacent to said stationary housing, .Iadd.a .Iaddend.movable mechanical transmission .[.elements.]. .Iadd.element .Iaddend.projecting from said movable housing, .[.and.]. means controlling the position of said transmission .[.elements.]. .Iadd.element .Iaddend.in accordance with the open and closed positions of said movable contacts of said primary switching means, said mechanical transmission .[.elements.]. .Iadd.element .Iaddend.being arranged for juxtaposition with and engagement with .Iadd.a .Iaddend.mechanical sensing .[.elements.]. .Iadd.element .Iaddend.projecting from said stationary housing when said movable housing is in said operative position .Iadd., and a mechanical trip member projecting from said movable housing and movable to control operation of said circuit breaker, said mechanical trip member arranged for juxtaposition with and engagement by a mechanical operating member projecting from said stationary housing when said movable 
     
     
        housing is in said operative position.Iaddend. 13. A movable housing assembly according to claim 12 in which said primary supply contacts have horizontally disposed axes and said movable housing is fitted with wheels 
     
     
        supporting it for horizontal movement. 14. A movable housing assembly according to claim .[.13.]. .Iadd.12 .Iaddend.in which .Iadd.either or both of .Iaddend.said mechanical transmission .[.elements.]. .Iadd.element and said mechanical trip member .Iaddend.project from the top of said movable housing. .[.15. A movable housing assembly according to claim 12 in which the switching means includes a trip member projecting from said movable housing and a spring-operated circuit breaker coupled with said trip member to break said primary circuit on movement of said trip member..].  .[.16. A movable housing assembly according to claim 15 in which said trip member projects from the top of said movable housing..]. 
     
     
         7. A movable housing assembly according to claim 12 in which said switching means in the movable housing comprises .[.a mechanism for moving.]. said movable contacts.Iadd., .Iaddend..[.between said open and closed positions and.].  a set of fixed contacts connected to respective ones of said primary supply contacts, .Iadd.and a mechanism for moving said movable contacts between said open and closed positions, .Iaddend.said movable contacts and said .[.moving.]. mechanism.[.;.]. .Iadd.for moving same .Iaddend..[.the assembly further comprising.]. .Iadd. being carried by .Iaddend.a frame which is removably mounted in said movable housing .[.and on which said movable contacts and mechanism for moving them are carried.].. .Iadd. 18. Electrical switchgear according to claim 1, wherein the trip control means is a trip control circuit. .Iaddend..Iadd. 19. Electrical switchgear according to claim 8, wherein the trip control means is a trip control circuit. .Iaddend.