RU2006118C1 - Metalclad switchgear cubicle - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: metalclad switchgear has body 1 where chamber 5 for entry of buses from adjacent cubicle incorporates interconnected round-section and flat buses. Draw-out chamber 3 accommodates roll-out bogie 7 with front posts 13 which abut on one side face panel 15 of bogie 7 mounting power transformer, power fuses, movable members 26 of power-circuit contacts and movable members 27 of split contacts. Frame of roll-out bogie 7 has rear posts 14, metal box with detachable cover, metal frame 35 with support insulators 36. Bottom part of cubicle has fixed members 30 of split contacts covered with metal case 49 and secured on inner wall 47 of draw-out chamber 3. Metal bracket 38 is mounted on front posts 13 of roll-out bogie 7 below frame 35 carrying support insulators 36. Movable members 26 of power-circuit split contacts are mounted on long rods 28. Bottom insulating box 55 has beveled flange; bottom bushing insulator 51 abuts bevel of insulating box 55. Round-section current-carrying buses running inside bushing insulators 51 are interconnected by means of metal bush and screws. EFFECT: improved design. 10 cl, 10 dwg

Description

 The invention relates to electrical engineering, in particular to the design of cabinets of high-voltage switchgear medium voltage switchgears.

 Famous cabinet complete switchgear with transformer N. consists of three blocks: power transformer, busbars and fuse disconnector. A power transformer is installed in the transformer block. N., the high voltage leads of which are connected by aluminum busbars to the lower fixed contacts of the rotary unit of the fuse-disconnector. This rotary unit is simultaneously the front door of the unit, from the bottom of which a strip is welded from the facade, which prohibits the opening of the doors of the power transformer unit. The fuse-disconnector block is divided by a partition into two compartments: on the left is the high voltage side compartment, and on the right is the circuit breaker compartment protecting the auxiliary circuits of the low voltage side [1].

 The disadvantages of the known design are as follows: the complexity of the design, the large dimensions of the cabinet due to the significant size of the power transformer.

 Known cabinet switchgear containing internal and external carts that are installed in the cabinet of the switchgear [2].

 The disadvantages of this design: complexity, large dimensions, increased material consumption, unreliability of the structure (increased mechanical loads on fuses and measuring transformers when driving the retractable element).

 A well-known cabinet of a complete switchgear is made with sliding elements (with a switch, with a sliding element - disconnector, with voltage transformers, with a power transformer) [3].

 The cabinet of the complete switchgear consists of four compartments: busbars, current transformers and cable connections; retractable element; relay cabinet. The retractable element is closed by a lid. Busbars are located in the busbar compartment, mounted on a rib and mounted on insulating boards on each side of the cabinet.

 Busbars, soldering them, cable assembly tires are made of aluminum or copper tires with rounded edges. They are insulated with a PVC plastic tube painted in colors corresponding to phasing (yellow, green, red). Insulation boxes are worn at the connection points of the busbars to the busbars. Solders from busbars are connected to the lower fixed disconnecting contacts mounted in a special design insulator.

 The retractable element is a metal roll-out cart on the rollers, on which a power transformer, fuses, and detachable contacts of the main and auxiliary circuits are installed. The power transformer on the draw-out trolley is located so that the primary voltage inputs are directed to the facade of the drawer. Fuses are located at the level of the power transformer and are rigidly attached to its primary voltage terminals. The detachable contacts of the main circuit are fixed to the drawout truck by means of brackets on which the fuses are held. And the brackets are located on the supporting insulators. The detachable contacts of the auxiliary circuit, made with flexible connection, are located on the front sheet of the drawer. The secondary voltage output of the power transformer is connected to a low voltage detachable contact.

 The disadvantages of the prototype: the complexity of the design, the large dimensions of the cabinet, significant material consumption (high metal consumption, etc.).

 The aim of the invention is to increase reliability, simplify the design, reduce the size and material consumption, improve operating conditions.

 The goal is achieved in that the enclosure of the complete switchgear comprises a housing in which the busbar compartment from the adjacent cabinet includes interconnected busbars - round busbars and flat busbars, with round busbars located in bushing insulators installed in the wall of the busbar compartment in which insulating boxes are installed on the connection sections of round-section tires with flat tires.

 In the drawer compartment there is a roll-out trolley with front racks, which, on one side, are adjacent to the front panel of the trolley. A power transformer, power fuses, movable elements of detachable contacts of the main circuit and movable elements of detachable contacts, which are used to relieve the secondary voltage of the transformer, which are fixed in the lower part of the frame of the withdrawable trolley, and a detachable contact of the auxiliary circuit with a set of type-setting clamps are installed on the cart.

 The roll-out carcass frame is additionally equipped with rear racks, a metal box with a removable cover, a metal frame with support insulators and a metal strip.

 The rear struts are shorter than the front.

 A metal box is installed in the upper part of the front struts, with the open side of the box located to the front panel and there is placed a horizontally detachable auxiliary circuit contact with a set of type-setting clamps closed with a removable cover.

 A power transformer is installed on the left side of the roll-out truck, with its large side parallel to the longitudinal axis of the roll-out truck.

 Opposite the power transformer, power fuses are installed vertically on the right side of the drawout truck, which are also arranged in a row parallel to the longitudinal axis of the drawout truck.

 Between the right front and rear racks there is a metal strip on which support insulators are located at intervals, to which power fuses are fixed.

 Between the front posts above the power transformer and fuses, a metal frame is installed, to the supporting insulators of which are attached movable elements of the detachable contacts of the main circuit.

 In the lower part of the cabinet, on the inner wall of the drawer compartment, fixed elements of detachable contacts are fixed, which serve to relieve the secondary voltage of the transformer, while these fixed elements are closed by a metal casing.

 The metal casing is attached to the inner wall of the drawer compartment.

 A metal bracket is attached to the front posts of the roll-out trolley below the metal frame with support insulators.

 The movable elements of the detachable contacts of the main circuit are made on elongated rods.

 A set of stacked clamps in a metal box is secured with a bracket.

 The lower insulating box is made with cut flanging, while the lower bushing is adjacent to the cut of the insulating box.

 Inside bushing insulators, circular busbars are connected using a metal sleeve and screws.

 The metal sleeve is fitted with non-insulated ends of round tires.

 Threaded holes for screws are made in the metal sleeve.

 There are rubber gaskets inside the bushing.

 In FIG. 1 shows a cabinet of a complete switchgear, general view; in FIG. 2 is a view along arrow A in FIG. 1; in FIG. 3 is a view along arrow B in FIG. 2; in FIG. 4 is a view along arrow B in FIG. 2; in FIG. 5 is a view along arrow D in FIG. 3; in FIG. 6 is a section DD in FIG. 1; in FIG. 7 - node I in FIG. 3; in FIG. 8 - busbar compartment from an adjacent cabinet; in FIG. 9 is a view along arrow E in FIG. 8; in FIG. 10 is a section LL in FIG. 9; in FIG. 11 - node II in FIG. 10.

 The enclosure of the complete switchgear comprises a housing 1, divided into a compartment 2 of busbars, a compartment 3 of a retractable element, a compartment 4 of linear buses, which is connected to a compartment 5 of the input bus from an adjacent cabinet, and a relay cabinet 6, in which the auxiliary equipment (not shown) is placed chains. In compartment 3, a retractable element 7 is installed in the form of a withdrawable trolley made on rollers 8. In the cabinet, the tire input compartment 5 from the adjacent cabinet is separated from the busbar compartment 2 and the drawer compartment 3 by means of partitions 9. The input compartment 5 is made with a cover 10, being the back of the cabinet. At the bottom of the input compartment 5 is a metal partition 11.

 The frame of the roll-out carriage 7 is a rigid metal structure, which is based on a horizontal support 12, at the corners of which are installed the front and rear racks 13 and 14. The rear racks 14 are made shorter than the front racks 13.

 The roll-out carriage 7 has a front panel 15 on which a removable sheet 16 is mounted. On one side, the front struts 13 are adjacent to the front panel 15.

 A rectangular metal box 17 is installed in the upper part of the carriage of the roll-out carriage 7 on the front racks 13, in which the detachable contact pin 18 of the auxiliary circuit is horizontally arranged with a set of type-setting clamps 19. The removable cover 20 partially covers the metal box 17 in which the bracket 21 is fixed. The bracket 21 holds a set of stacked clamps 19, which connect the conductors 22 to the detachable contact 18 of the auxiliary circuit. Conductors 22 provide electrical communication with a circuit breaker (not shown) mounted in a cabinet.

 A power transformer 23 with flexible inputs 24 of the primary voltage, power fuses 25, movable elements 26 of the detachable contacts of the main circuit and movable elements 27 of the detachable contacts used to relieve the secondary voltage of the power transformer 23 are installed on the horizontal support 12 of the drawout carriage 7. The movable elements 26 are mounted on elongated rods 28, are part of the detachable contacts of the main circuit, also containing fixed elements 29 in the form of rods that are installed in the cabinet.

 The movable elements 27 are part of the detachable contacts for removing the secondary voltage of the power transformer 23, also containing the fixed elements 30 in the form of rods that are installed in the cabinet.

 Inside the cabinet, an insulating support panel 32 is attached to its inner wall 31, in which the fixed elements 9 of the detachable contacts of the main circuit are fixed.

 A power transformer 23 is installed on the left side of the withdrawable carriage 7, the transverse axis of the transformer 23, i.e., its greater side, being parallel to the longitudinal axis of the withdrawable carriage 7.

 In the right part of the withdrawable carriage 7 opposite the power transformer 23, power fuses 25 are installed vertically parallel to the longitudinal axis of the withdrawable carriage 7.

 Power fuses 25 are held on the supporting insulators 33, which are spaced at intervals on a metal strip 34, which is installed between the front and rear racks 13 and 14 on the right side of the withdrawable carriage 7.

 Between the front struts 13 of the roll-out carriage 7, in its upper part, a support metal frame 35 is fixedly fixed to which the movable elements 26 of the main chain are attached.

 The elongated rods 28 of the movable elements 26 are held on the supporting insulators 36, which are rigidly attached to the supporting frame 35.

 Thus, the movable elements 26 of the main circuit are located above the power transformer 23 and fuses 25.

 The movable elements 26 of the main circuit are electrically connected by flexible conductors 37 to the power fuses 25, which are connected to the flexible inputs 24 of the power transformer 23.

 To the front racks 13 of the roll-out carriage 7 below the metal support frame 35 with support insulators 36, a metal bracket 38 is fixed for mounting an automatic switch (not shown) on it, which serves to turn on the power transformer 23 under load.

 On the front panel 15 of the withdrawable carriage 7, a window 39 is made for operating with an automatic switch.

 On the other side of the power transformer 23, low voltage leads 40 are located, designated a, b, s.

 To ensure electrical communication, the conclusions 40 are connected with the movable elements 27 using conductors 41, stretched along the right and left sides of the frame of the roll-out cart 7.

 Moving elements 27 for relieving secondary voltage are fixed to the getinaksovoy plate 42 using the bars 43, and the plate 42 is rigidly attached to the angle 44, which is located in the lower part of the frame of the roll-out cart 7 and is rigidly connected to it.

 In the lower part of the cabinet there are fixed elements 30 of detachable contacts used to relieve the secondary voltage of the power transformer 23. The fixed elements 30 are attached to the busbars 45, which are mounted on the getinaksovoy plate 46, which is fixed to the inner wall 47 of the compartment 3 of the retractable element. Conductors 48 are connected to the bottom of the busbars 45, which are connected to a relay cabinet 6.

 The fixed elements 30 are closed by a metal casing 49 to prevent accidental contact with the elements 30 when the roll-out carriage 7 is pumped out of the cabinet. In the metal casing 49, openings are provided for the input of the movable elements 27 of the detachable contacts to relieve secondary voltage.

 The busbar compartment 5 from the adjacent cabinet contains live busbars 50 of circular cross-section passing through the bushing 51, which are attached on both sides to the wall of the compartment 5. In the compartment 5 of the input also made flat current-carrying busbars 52.

Tires 50 are connected to flat tires 52 at an angle of 90 ^about . Tires 52 pass through bushing insulators 53 and are connected to the fixed elements 29 of the detachable contacts of the main circuit.

 Feedthrough insulators 53 are installed on the baffle 11 in the busbar compartment 5.

 The connection of each flat bus 52 with the round bus 50 is a collapsible contact connection 54, which is closed by an insulating box 55 to protect against electrical breakdown.

 Flanging is cut off on one side in the lower insulating box 55 to allow the connection of the lower busbar 50 to the flat bus 52 and the installation of the lower bushing 51, that is, the lower bushing 51 is adjacent to the cut of the insulating box 55. The bushing 51 is also installed busbars 56 of circular cross section from an adjacent cabinet. Inside the bushing 51, a circular busbar 50 is connected to a similar busbar 56 from an adjacent cabinet. Insulating tubes 57 are mounted on current-carrying busbars 50 and 56 of circular cross-section. The busbars 50 and 56 are connected using a metal sleeve 58 and screws 59. The sleeve 58 is mounted on the uninsulated ends 60 of the round busbars 50 and 56, and then into the threaded holes 61 made in the sleeve 58, four screws 59 are screwed in until tight compression. To prevent the displacement of the tires 50 and 56, rubber gaskets 62 are located inside the bushings 51. A thickening 63 is made at the opposite end of each bus 56 from an adjacent cabinet due to additional insulation.

 Cabinet KPU works as follows.

 When rolling in the roll-out carriage 7, the movable elements 26 enter the inside of the insulating support panel 32 and are connected in it with the fixed elements 29 of the detachable contacts of the main target, thereby supplying electrical voltage to the power transformer 23.

 At the same time, the movable elements 27 are connected to the stationary elements 30 in the metal casing 49, thereby ensuring the removal of the secondary voltage from the power transformer 23 and the transmission of voltage to power the auxiliary equipment in the relay cabinet 6.

 The invention allows to simplify the design; reduce dimensions (switch from a cabinet width of 1125 mm to a width of 750 mm); reduce the consumption of ferrous and non-ferrous metals (the length of linear and busbars is reduced).

 In general, the mass reduction of the cabinet and the retractable element is carried out by installing three support insulators on which the movable elements of the detachable contacts of the main circuit are held instead of six insulators, which leads to a decrease in the number of purchased products.

 (56) K. Doroshev. Operation of complete switchgear 6-220 kV. - M.: Energoatomizdat, 1987, p. 67, fig. 3.7.

 Japanese Application N 64-9805, CL H 02 B 11/12, 1989.

 Catalog 02.61.09-89, complete distribution devices, KM-1F series. - M.: Informelectro, 1989.

Claims (10)

 1. CABINET OF THE COMPLETE DISTRIBUTION DEVICE, comprising a housing in which the busbar compartment from the adjacent cabinet includes interconnected busbars of circular cross-section and flat, wherein the busbars of circular cross-section are located in bushing insulators installed in the wall of the busbar compartment, in which insulating boxes are installed on the connection sections of round-section tires with flat tires, a draw-out trolley with front racks, which are adjacent to the front panel of the trolley on one side, is located in the drawer compartment moreover, a power transformer, power fuses, movable elements of detachable contacts of the main circuit and movable elements of detachable contacts, which are used to relieve the secondary voltage of the transformer, which are fixed at the bottom of the frame of the withdrawable trolley, and a detachable contact of the auxiliary circuit with a set of type-setting clamps are installed on the trolley, characterized the fact that the roll-out carcass frame is additionally equipped with rear racks, a metal box with a removable cover, a metal frame with support insulators, and thallic strip, while the rear pillars are made shorter than the front ones, the metal box is installed in the upper part of the front pillars, with the open side of the box located on the front panel and there is placed a horizontally detachable auxiliary circuit contact with a set of type-setting clamps closed with a removable cover, power a transformer is installed on the left side of the roll-out truck, and its large side is parallel to the longitudinal axis of the roll-out truck, while on the right side of the roll-out truck opposite to silt transformer, power fuses are vertically mounted, which are also arranged in a row parallel to the longitudinal axis of the roll-out carriage, while a metal strip is installed between the right front and rear racks, on which the insulators are attached to which the power fuses are attached, and between the front racks above the power racks a metal frame is installed with a transformer and fuses, to the supporting insulators of which are movable elements of detachable contacts of the main circuit and, in the lower part of the cabinet, on the inner wall of the sliding element stationary elements fixed compartment separable contacts serving for removal of the secondary transformer voltage, and the fixed elements are closed metallic casing.  2. A cabinet according to claim 1, characterized in that the metal casing is attached to the inner wall of the drawer compartment.  3. A cabinet according to claim 1, characterized in that a metal bracket is attached to the front struts of the roll-out trolley below the metal frame with support insulators.  4. The cabinet according to claim 1, characterized in that the movable elements of the detachable contacts of the main circuit are made on elongated rods.  5. A cabinet according to claim 1, characterized in that the set of type-setting clamps is fixed in a metal box using a bracket.  6. The cabinet according to claim 1, characterized in that the lower insulating box is made with cut flanging, while the lower bushing is adjacent to the cut of the insulating box.  7. A cabinet according to claim 1, characterized in that inside the bushing insulators, busbars of circular cross section are connected using a metal sleeve and screws.  8. A cabinet according to claim 7, characterized in that the metal sleeve is mounted on the uninsulated ends of the round tires.  9. The cabinet according to claim 8, characterized in that threaded holes for screws are made in the metal sleeve.  10. A cabinet according to claim 1, characterized in that rubber gaskets are located inside the bushings.

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