RU2382460C1 - Cubicle switchboard cabinet - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is related to the field of electric engineering and may be used for operation in power plants of three-phase alternating current with frequency of 50 (60) Hz and rated voltage of 6 (10) kV. Cubicle switchboard cabinet (CS) with middle location of rolled-out element (RE) consists of rolled-out element compartments, linear, relay and busbar compartments. All compartments, apart from relay one, are equipped with pressure relief valves, at the same time line of pressure relief valves opening is arranged as perforated, and valve of linear compartment is located on back wall of cabinet and is arranged as bent along with perforation line towards the side of this compartment. Relay compartment is arranged with the possibility of its installation outside cubicle switchboard cabinet. Doors of rolled-out and linear elements compartments are equipped with lock devices and inspection windows, besides inspection windows are equipped with additional metal moving shutters, and doors are fixed in several points and controlled with a single handle, which serves both for their opening. Opening for key of RE motion into RE compartment doors is equipped with additional guide, and locking mechanisms are arranged on quick-detachable bottom of RE compartment. Protective shutters of shutter-lifting mechanism are made in the form of a single sheet with openings for passage of RE contacts, and shutter-lifting mechanism itself is equipped with additional blocking mechanism for provision of RE compartment door closed condition, when RE is located in rolled-in position. Current transformers in linear department are installed on additional frame so that their bases are located parallel towards bottom of linear compartment.

EFFECT: reduced dimensions, improved safety and simplified servicing of cabinet with proposed design.

2 cl, 9 dwg

Description

The invention relates to the field of electrical engineering and can be used to work in electric power plants of three-phase alternating current with a frequency of 50 (60) Hz, rated voltage of 6 (10) kV.

Known cabinet complete switchgear / 1 / with an average location of the withdrawable element (VE), consisting of compartments of the withdrawable element, compartment busbars, as well as linear and relay compartments. All the compartments of the cabinet, except the relay, are equipped with overpressure relief valves installed in the upper part of the cabinet. The design of the cabinet provides locking mechanisms to prevent emergencies due to incorrect actions by staff.

The disadvantages of this cabinet are its relatively large overall dimensions and design complexity.

Closest to the proposed one is a cabinet of a complete distribution switchgear type КРУ / 2 /, containing a high-voltage switch on a withdrawable trolley located in the middle of the cabinet. The cabinet is divided by partitions into compartments of the withdrawable element, the busbar compartment, as well as the linear and relay compartment. All the compartments of the cabinet, except the relay, are equipped with overpressure relief valves. In this case, the valves of the withdrawable element compartment and the busbar compartment are located in the upper part of the cabinet, and the valve of the linear compartment is located on the rear wall of the cabinet. The line compartment is equipped with current transformers and zero sequence current transformers, the current transformers being installed with a base perpendicular to the rear wall of the cabinet. The drawout element compartment is equipped with a curtain mechanism. Drawer element and linear compartments are equipped with doors with locking devices and viewing windows. The compartment door of the withdrawable element is provided with an opening for a key for moving the withdrawable element.

The disadvantages of this cabinet are its relatively large overall dimensions and the complexity of maintenance.

The aim of the invention is to reduce the overall dimensions, increase safety and simplify maintenance and design.

This goal is achieved by the fact that in the cabinet of the complete switchgear with the middle location of the withdrawable element, consisting of compartments of the withdrawable element, linear, relay and compartment busbars and having locking mechanisms, while the compartment of the withdrawable element, the linear compartment and the compartment of busbars are equipped with relief valves overpressure, and the overpressure relief valve of the linear compartment is located at the rear of the cabinet, the drawer and linear compartments are equipped with doors with locking devices and with viewing windows, the door of the withdrawable element compartment is provided with an opening for a key for moving the withdrawable element, the withdrawable element compartment is equipped with a curtain mechanism with protective shutters and a bottom, and the linear compartment is equipped with current transformers and zero sequence current transformers, current transformers in the linear compartment are mounted on an additional frame so that their bases are located parallel to the bottom of the linear compartment, the bottom of the drawout element compartment is quick-detachable, and the locking mechanisms are located and on this day, the curtain shutter protective shutters are made in the form of a single sheet with holes for passage of the withdrawable element contacts, and the shutter mechanism itself is equipped with an additional locking mechanism to ensure the withdrawable element compartment door is closed when the withdrawable element is in the pumped-in position, the hole for the transfer key the door of the withdrawable element is equipped with an additional guide, the inspection windows of the doors are equipped with additional metal movable curtains, ixing of doors is carried out in several places and is controlled by one handle, which also serves to open doors, the opening line of the pressure relief valves is perforated, the overpressure relief valve of the linear compartment is made curved along the perforation line towards the linear compartment, and the relay compartment is designed to be installed outside switchgear cabinet.

In addition, zero-sequence current transformers can be moved outside the linear compartment and mounted on a frame designed for placement in a cable pit.

Placing current transformers in a linear compartment on an additional frame so that their bases are parallel to the bottom of the linear compartment, simplifies maintenance of these transformers.

Performing the bottom of the drawout element compartment with quick-detachable ones with the installation of locking mechanisms on this bottom allows you to quickly dismantle the cabinet and repair or adjust the locking mechanisms in case of emergency.

The implementation of the protective curtains of the curtain-lifting mechanism in the form of a single sheet with holes for the passage of the contacts of the withdrawable element simplifies the design of this mechanism and, therefore, facilitates its maintenance and repair.

Providing the curtain-lifting mechanism with an additional locking mechanism to ensure the closed state of the withdrawable element compartment door when the withdrawable element is in the pumped-in position serves as additional protection against erroneous actions by maintenance personnel and, therefore, increases the safety of maintenance.

Providing a hole in the door for the key for moving the withdrawable element of the additional guide simplifies the operation of this key.

The supply of door inspection windows with additional metal movable curtains additionally protects maintenance personnel in case of emergency situations inside the compartments.

Locking doors in several places while controlling one handle, which also serves to open doors, additionally protects service personnel in case of emergency situations inside the compartments and simplifies the handling of these doors.

The implementation of the perforated opening line of pressure relief valves allows you to get rid of additional elements (door hinges), which simplifies the design of the cabinet.

The execution of the overpressure relief valve of the linear compartment curved along the perforation line towards the linear compartment helps to reduce the overall dimensions of the cabinet.

The ability to install the relay compartment outside the cabinet of the complete switchgear allows operations with relay equipment and control the switchgear cabinet at a distance from it, which increases the safety of staff in case of emergency situations inside the switchgear cabinet.

The removal of zero sequence current transformers outside the linear compartment and their installation on the frame in the cable pit increases the free volume of the linear compartment and thereby facilitates the installation and maintenance of input and output power cables.

Figure 1 presents a General view of the switchgear cabinet (upper drawing - side view, lower drawing - front view), while the relay compartment is outside the cabinet.

Figure 2 shows the linear compartment of the switchgear cabinet with current transformers mounted on the frame so that their bases are parallel to the bottom of the compartment.

Figure 3 presents the removable bottom of the compartment withdrawable element installed on it with locking devices and a grounding device.

Figure 4 presents the compartment of the withdrawable element with a rod-lifting mechanism and a protective shutter, made in the form of a single sheet with holes for the passage of contacts of the withdrawable element.

Figure 5 presents an additional locking mechanism to ensure the closed state of the compartment door of the withdrawable element when the withdrawable element is in the pumped position.

Figure 6 shows the hole in the door of the compartment of the withdrawable element for a key for moving the withdrawable element with an additional guide.

Figure 7 presents the viewing windows of the doors of the linear compartment and the drawout element compartment, equipped with additional movable metal shutters.

On Fig presents a mechanism for fixing the doors of the linear compartment and the drawout element compartment, ensuring their locking in several places while providing control of one handle, which also serves to open the doors.

Figure 9 shows the pressure relief valves from the busbar compartments and the draw-out element compartment (upper drawing), and from the linear compartment (lower drawing) with perforated bending lines, i.e. lines along which the valves open when emergency conditions occur in them. Moreover, for the linear compartment, the perforation passes along the line of structural folding of the valve sheet.

The cabinet of the complete switchgear (hereinafter referred to as the switchgear, Fig. 1) consists of a busbar compartment 1 equipped with an overpressure relief valve 5, a drawer compartment 2 located in the middle of the switchgear cabinet and containing a switching device (for example, a vacuum circuit breaker) 6 or other electrical equipment. This equipment is mounted on a roll-out cart. In addition to the above switchgear cabinet contains a linear compartment 3, equipped with current transformers 7, which are mounted on an additional frame. In addition, the linear compartment can be equipped with zero sequence current transformers 8, which can be installed both in the compartment itself and on an additional frame 10 in the cable pit. The draw-out element compartment 2 contains an overpressure relief valve 4 and is provided with a door 8 on the front side that is provided with an inspection window 11. The line compartment 3 is also equipped with an overpressure relief valve (not shown in FIG. 1) and a door 9 that is provided with an inspection window 12 The relay compartment of the switchgear cabinet is not shown in Fig. 3 (it is assumed that it is placed in a separate room).

To switch the external electric power circuit, the withdrawable element with the switch 6 should be moved from the control position (shown in Fig. 1) to the working position (power contacts of the switch are connected to the mating parts of the switchgear cabinet) and turn on the switch 6.

Figure 2 shows the linear compartment with current transformers 1 mounted on an additional frame 2. This arrangement greatly simplifies the maintenance of these transformers 1, and the height of the frame 2 is selected from the condition of convenient connection and maintenance of the power cable to the solder 3 of these transformers, which simplifies the maintenance of linear compartment.

Figure 3 presents the removable bottom 1 of the compartment of the withdrawable element with the locking devices 2 mounted on it and the grounding device 3 (upper drawing is a top view, the lower drawing is a bottom view). Such a layout solution allows the assembly and commissioning of this unit separately from the rest of the cabinet, which greatly simplifies the process of assembly of the cabinet as a whole. In addition, the ease of dismantling the bottom 1 during operation facilitates access to the serviced elements of the cabinet and reduces the service time of this cabinet as a whole.

Figure 4 presents the compartment of the withdrawable element with a stock-raising mechanism 3 and a protective shutter 1, made in the form of a single sheet with holes 2 for passing contacts of the withdrawable element (the left and upper walls of the compartment are not shown conventionally). When moving the withdrawable element from the control position to the work sheet with holes 2 it moves upward, allowing access to the mating parts of the power circuit of the switchgear cabinet (not shown in Fig. 4). This layout solution simplifies the manufacturing process and assembly of the rod-lifting mechanism, provides a more accurate operation of its kinematic units and simplifies its maintenance during operation.

Figure 5 presents an additional locking mechanism 5, 7 to ensure the closed state of the compartment door of the withdrawable element when this withdrawable element 1 is in the pumped-in (working) position. The essence of the functioning of this mechanism is as follows. When moving from a control position to a working roll-out element 1, acts with its element 2 on the beam 3 of the curtain-lifting mechanism, which is mounted on the cabinet wall (not shown conditionally in FIG. 5) with the possibility of rotation about axis 4. At the same time, the rods 10 and the curtain 6 move up , providing access to the mating parts of the power circuit of the switchgear cabinet, and the rod 5 of the additional locking mechanism ensures counterclockwise rotation of the hook 7 relative to its axis 9 mounted on the cabinet wall (not shown in Fig. 5). The hook 7 engages with the element 8 of the closed door of the compartment of the withdrawable element and does not allow to open this door until the withdrawable element is moved back to the control position. This technique further enhances the safety of staff.

Figure 6 shows the hole 1 with an additional guide in the compartment door of the withdrawable element. This hole is for the sliding key. The hole 1 with an additional guide provides a fixed position of the key for moving the withdrawable element when manipulating this key and, therefore, simplifies the manipulation of the withdrawable element and the maintenance of the cabinet as a whole.

Figure 7 shows the inspection windows of the doors of the linear compartment and the drawout element compartment, equipped with additional metal movable curtains 2. The inspection windows of the doors consist of a series of inspection holes 1 made in these doors. Additional metal curtains 2 also contain viewing holes 3, closed from the back with a plate of transparent material. These shutters 2 can be moved horizontally by controlling them with the handle 4. In the working position, the openings 1 in the doors are blocked by metal elements of the additional shutter 2 (as shown in Fig. 7), which additionally protects the operating personnel from abnormal operating modes of the equipment. For visual monitoring of the state of the equipment of the linear compartment and the compartment of the withdrawable element, the additional curtain 2 should be moved to the right position by acting on the handle 4. In this case, the holes in the doors 1 will be combined with the holes in the additional curtains 2, thereby providing visual control of the equipment of the compartments.

On Fig presents a mechanism for fixing 2, 3, 4 doors of the linear compartment and the drawout element compartment, ensuring their locking in several places while providing control of one handle 1, which also serves to open the doors. The mechanism contains elements 2 (structurally similar to element 8 shown in FIG. 5), belonging to the door and controlled by a handle 1 mounted for movement in the vertical direction. To fix the door in the closed position, handle 1 should be moved to its highest position, close the door and lower the handle 1 to its lowest position. At the same time, the door elements 2 mesh with the elements 3 and 4, which are accessories of the cabinet frame, the doors are securely locked in the closed state and are not able to open when emergency conditions occur in the operation of the equipment. Doors open in the reverse order. The hooks 5 are additional locking elements shown in Fig. 5, and additionally fix the door of the withdrawable element compartment in the closed state when this withdrawable element is in the operating (pumped) position.

Figure 9 shows the pressure relief valves 2 and 3 from the busbar compartment and the drawout element compartment (upper drawing), and from the linear compartment 4 (lower drawing) with perforated bending lines 1. When emergency conditions occur in the compartments, the valves open along the lines perforation. Relatively small short-circuit currents lead to the opening of the valves along the perforation lines located in the middle of these valves. More significant short-circuit currents lead to the opening of the valves along the perforation lines located at the points of fastening of the valves.

The proposed arrangement simplifies the design of the valves.

The proposed configuration of the valve of the linear compartment and the implementation of the perforation line along the line of structural folding of the valve sheet contribute to a decrease in the overall dimensions of the cabinet as a whole and allow, unlike the known devices, to position it almost close to the wall of the switchgear room with a one-way service option.

List of sources used

1. A.Popov. UNIGEAR ZS1 in Russia. “News of Electrical Engineering”, No. 1 (25), 2004.

2. S.N. Usachev, V.G. Komov. Utility Model Certificate No. 26692, 08/08/2002. "Cabinet of complete distribution switchgear type KRU".

Claims (2)

1. Cabinet switchgear with an average location of the withdrawable element, consisting of compartments of the withdrawable element, linear, relay and compartment busbars and having locking mechanisms, while the compartment of the withdrawable element, the linear compartment and the compartment of busbars are equipped with overpressure relief valves, and the valve the overpressure relief of the linear compartment is located at the rear of the cabinet, the drawer element and linear compartments are equipped with doors with locking devices and viewing windows, the compartment door is withdrawable of the element is provided with an opening for the key for moving the withdrawable element, the compartment of the withdrawable element is equipped with a curtain mechanism with protective shutters and a bottom, and the linear compartment is equipped with current transformers and zero-sequence current transformers, characterized in that, in order to reduce the overall dimensions, increase safety and simplify maintenance and structures, current transformers in the linear compartment are mounted on an additional frame so that their bases are parallel to the bottom of the linear compartment, the bottom of the compartment and the withdrawable element is quick-detachable, and the locking mechanisms are located on this bottom, the protective shutters of the curtain-lifting mechanism are made in the form of a single sheet with holes for passing contacts of the withdrawable element, and the curtain-lifting mechanism is equipped with an additional locking mechanism to ensure the closed state of the compartment door of the withdrawable element when finding the withdrawable element element in the pumped-in position, the hole for the displacement key in the door of the withdrawable element is provided with an additional guide, see the door windows are equipped with additional movable metal shutters, the doors are fixed in several places and controlled by a single handle, which also serves to open the doors, the opening line of the pressure relief valves is perforated, the overpressure relief valve of the linear compartment is made curved along the perforation line towards the linear compartment, and the relay compartment is configured to be installed outside the cabinet of the complete switchgear. 2. The cabinet of the complete switchgear with the middle location of the withdrawable element according to claim 1, characterized in that the zero sequence current transformers are moved outside the linear compartment and mounted on a frame intended for placement in a cable pit.

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