RU2189097C2 - Single-access prefabricated high-voltage cubicle - Google Patents

Abstract

FIELD: metalclad switchgear. SUBSTANCE: cubicle designed for 6-10 kV metalclad switchgear is made in the form of metal cabinet accommodating vertically disposed pieces of equipment and bus system for single connection to collecting buses. Bay of collecting buses is arranged in each cubicle horizontally in its central part. Junctions between collecting buses and respective pieces of equipment are arranged vertically in its top and bottom parts. Front door is halved through its face and height to provide alternate access to each piece of equipment installed in cubicle bay. Bay doors are fitted with mechanical interlocking devices enabling access to cubicle bay only upon disconnecting respective bay-feeding pieces of equipment and grounding them. Proposed design of switchgear cubicle provides for increasing its holding capacity and reducing space requirement, facilitating its assembly and wiring in building indoor transformer substations for urban and rural applications. EFFECT: enhanced safety of switchgear operation and maintenance. 8 cl, 6 dwg

Description

 The invention relates to the field of high-voltage apparatus engineering and can be specifically used in the construction of prefabricated unilateral service chambers (CSR) for a voltage of 6 ... 10 kV AC.

 There are well-known designs of KSO chambers designed to equip indoor switchgear (RU) with a voltage of 6 ... 10 kV transformer substations for receiving and distributing electricity in urban and rural electric networks. The cameras are used in indoor switchgear and are manufactured in accordance with the grid of circuits of basic electrical primary connections. CSR cameras, where a load switch is used as an integrated switching device, are referred to the 300 series [1, 2].

 Structurally, the KSO camera [3] is made in the form of a metal cabinet welded from metal sheets and profiles, inside of which equipment is placed vertically, depending on the specific camera circuit and busbar for one connection to the busbars. In the upper part of the chamber, support insulators are fixed on a metal frame, on which, after installing all the cameras in the switchgear, busbars are laid. The switching device (load switch or disconnector or earthing switch) is controlled by the appropriate drive, the control elements of which are placed on the front wall of the cell. Access to the devices themselves during installation and operation is through a door common to the entire camera, located on the front wall of the camera. Of these chambers, equipped in accordance with the existing circuit grids, high voltage switchgears for closed transformer substations (ZTP) are implemented, which can be dead-end, pass-through, one- and two-transformer.

 The disadvantage of these chambers is that they are performed on one connection to the busbar system (transformer, overhead line, cable line). At the same time, the overall dimension of the chamber in terms of width is determined by the electrical dimension of the apparatus in terms of width and two insulating phase-to-ground distances, and for cameras with a voltage of 10 kV it must not be less than 800 mm.

 In addition, the chamber, depending on the scheme, does not use enough internal volume in height. The low degree of filling of the CSR chamber forces them to install a larger number for assembling the necessary primary connection diagram, which leads to an increase in the size of the ZTP building, the occupied space, and the complexity of the installation work being performed.

 The disadvantage is that the presence of a common door does not provide sufficient security when replacing high-voltage fuses in the chamber if they are located under a switching device (load switch or disconnector), and closing the circuit breaker for a short circuit when the door is open can lead to electrical injury.

 The objective of the present invention is to provide the design of the CSR camera with a greater degree of filling of the internal volume, which allows to reduce the area of switchgear, the amount of construction and installation work during the construction of the ZTP and to increase reliability and safety during operation.

 The solution to this problem is achieved by the fact that in the well-known CSR chamber in the form of a cabinet with walls and a door containing busbars, switching devices connected to busbars using a bus and forming connections, these busbars are installed horizontally in the middle of the chamber, and the connections to busbars are mounted vertically in its upper and lower parts. For greater compactness, at least two connections with access to overhead lines or to adjacent cells can be formed in the upper part of the chamber. At least two connections can be formed at the bottom of the chamber with access to cable lines or to adjacent cells. Also, to increase compactness, the camera can be equipped with a fuse located in the lower part of the camera parallel to the switching device and electrically connected to it by a busbar in series with the output through the rear wall of the camera. It is also possible to design a camera with a fuse located in the upper part of the camera parallel to the switching device and electrically connected to it by a bus in series with the output through the rear wall of the camera. To increase safety, switching devices and fuses are equipped with earthing switches on both sides. To reduce the area of the open parts of the devices that are accessible by accidental contact with the door open, and to increase security, the camera door can be divided in two in width and / or height to form independent sections with doors and provide access to each of the installed devices in the corresponding sections of the camera. To increase security, the camera is equipped with block locks that provide alternate opening of section doors, and block locks that provide access to the section only after disconnecting and grounding switching devices that supply voltage to the section, and the inability to close the section door when the earthing switches are on.

 The invention is illustrated by drawings. Figure 1 shows the electrical diagram of the primary connections of the chamber of a single-transformer substation of 10 kV (two-line-transformer circuit) with two suitable overhead lines and one output; figure 2 is the same as in figure 1, but with two suitable cable lines and one output; figure 3 is an electrical diagram of the primary connections for a block two-transformer substation of 10 kV with the connection of two suitable overhead lines and two outputs; figure 4 is the same as in figure 3, but with the connection of two suitable cable lines and two outputs; figure 5 - camera design with front doors, divided in height; figure 6 is the same as in figure 5, side view.

 Structurally, the claimed chamber is made in the form of a cabinet 1 (Fig. 5) with walls 2 and a door 3 (Fig. 6), inside of which horizontal busbars 4 (Fig. 3) are installed horizontally in its middle part. Switching devices 5 (Fig. 3) connected to the busbars 4 using busbar 6 form connections 7 mounted vertically in the upper and lower parts of the chamber. Connections 7 have exits to overhead lines when the connections are located in the upper part, to cable lines - when located in the lower part of the chamber and to neighboring cells - at any of the indicated locations of the connections. Fuses 8 can be installed in the upper or lower part of the chamber, which are mounted parallel to the switching device 5 and are electrically connected to it in series with the connection output through the rear wall of the chamber. Switching devices 5 and fuses 8 are equipped with earthing switches 9. To reduce the area of the open parts of the devices accessible by accidental contact, the front door 3 (Fig.6) is divided into doors 10 (Fig.5). To increase security, block locks (not shown) are installed on the doors 10, consisting of two elements, one of which is installed on the doors, and the other on the actuators 11 (Fig.6) of the switching device. The lock block of the door of the fuse box cannot be opened until the earthing switch is turned on, and you cannot close this door when the fuse earthing switches are on.

 An analysis of the chambers shown in figures 1, 2 and 4 shows that one factory-made chamber for three connections with a width of 1690 mm replaces at least three ordinary chambers with a total width of 2400 mm due to a more rational use of the internal space and the placement of four devices in four sections (compartments) of the camera.

 Accordingly, a switchgear of a two-transformer substation with two lines (overhead or cable) is mounted from two similar chambers with their connection according to FIGS. 3 or 4. At the same time, the dimensions of the buildings of closed transformer substations, the labor costs and the cost of the construction of substations will decrease by 1.2-1.5 , and the increased factory availability of the cameras will significantly reduce the amount of installation work associated with the connection of individual devices of different cameras due to the fact that they are made inside the cameras of a new design in the process of their manufacture.

 The presence of separate doors of each section of the camera significantly increases the safety of maintenance during operation, as the doors are equipped with interlocks that open access to the compartment after disconnecting and grounding the corresponding switching devices that supply voltage to the chamber section.

 In turn, the locks installed on the doors and drives of the earthing switches allow them to be turned off only when the doors of the corresponding sections of the chamber are closed.

 The described design of the KSO-396 series cameras, developed by VZVA CJSC, was approved by RAO UES of Russia, and the ROSEP head institute prepared a typical design of closed transformer substations of high factory readiness for urban and rural networks with a voltage of 6 ... 10 kV.

Sources of information
1. Knyazevsky B.A., Lipkin B.Yu. Power supply of industrial enterprises: Textbook. 2nd ed., Revised. and add. - M .: Higher school, 1979, p. 148-150.

 2. Dobrodeev E.D., Rozhkova L.D. Electrical equipment of thermal power plants. - M .: Energy, 1969, p. 220-221.

 3. Cameras of the KSO-392 series. Specifications IKZHM. 674531.005 TU-16.

Claims (8)

 1. The chamber is a prefabricated one-way high-voltage service in the form of a cabinet with walls and a door, containing busbars, switching devices connected to the busbars by a bus and forming connections, characterized in that the busbars are installed horizontally in the middle of the chamber, and the connections to busbars are mounted vertically in its upper and lower parts.  2. The chamber is a one-way service team according to claim 1, characterized in that at least two connections are formed in its upper part with access to overhead lines or to neighboring cells.  3. The camera is a one-way service team according to claim 1, characterized in that at least two connections are formed in its lower part with access to cable lines or to adjacent cells.  4. The camera is a one-way service team according to claim 1 or 2, characterized in that it is additionally equipped with a fuse, the specified fuse is located in its lower part of the camera, mounted parallel to the switching device located in the lower part of the camera, and is electrically connected to it by a bus in series with output connection through the rear wall of the camera.  5. The camera is a one-way service team according to any one of p. 1 or 3, characterized in that the camera is additionally equipped with a fuse, said fuse is located in the upper part of the camera, mounted parallel to the switching device located in the upper part of the camera, and is connected electrically to it by a bus in series with accession connection through the back wall of the chamber.  6. Luggage team unilateral service according to any one of paragraphs. 1-5, characterized in that the switching devices and fuses are equipped with earthing.  7. Camera one-way service team according to any one of paragraphs. 1-6, characterized in that the chamber door is divided in two in width and / or height with the formation of independent sections with doors and providing access to each of the installed devices in turn in the corresponding sections of the chamber.  8. The camera is a one-way service team according to claim 7, characterized in that the section doors are equipped with block locks with the ability to access these sections after disconnecting and grounding switching devices that supply voltage to the camera sections.

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