C-GIS (Gas Insulated Switchgear) bus equipment cabinet with grounding on-off switch on main bus

Abstract

A C-GIS bus equipment cabinet with a grounding on-off switch on a main bus comprises a cabinet body, the cabinet body is provided with an air chamber, a mechanism chamber, a small bus chamber, a secondary instrument chamber and a cable chamber, a three-position isolating switch is arranged in the air chamber of the cabinet body, the bus grounding on-off switch is further arranged in the air chamber, the bus grounding on-off switch comprises a grounding moving contact tube, and the grounding moving contact tube is provided with a grounding contact. The grounding moving contact is slidably connected in the grounding moving contact tube, the grounding static contact tube is fixedly connected with the grounding moving contact tube, and the grounding static contact is fixedly arranged in the grounding static contact tube; the grounding static contact is fixedly embedded in a partition plate between the air chamber and the mechanism chamber, and an insulating part is arranged at the joint; a bus grounding operation mechanism of the bus grounding on-off switch is fixedly arranged in the mechanism chamber; reliable grounding of the main bus can be realized by a single device, the space of a power distribution room is saved, and good safety guarantee is provided for operators.

Description

Technical Field

[0001] The utility model relates to an electric control cabinet, in particular to a C-GIS busbar equipment cabinet with a main busbar and a grounding opening and closing switch. Background Art

[0002] C-GIS busbar equipment cabinet is a new type of switchgear used in 10~35kV or higher voltage power transmission and distribution systems to receive or distribute electric energy and to perform control, protection, measurement, monitoring, communication and other functions in normal operation and fault conditions of the power system.

[0003] C-GIS busbar equipment cabinet has the characteristics of small size, small footprint, easy installation and construction, no influence from external environment, safe and reliable operation, flexible configuration, simple maintenance, long maintenance cycle, etc. It is more and more widely used in urban network substations. C-GIS busbar equipment cabinet has also become the first choice for ultra-high voltage transmission and transformation equipment. With the continuous increase in the scale and speed of urban construction and the needs of railway development, C-GIS busbar equipment cabinet is also being put into practical use in the medium voltage field.

[0004] Currently, when the high-voltage side of the power grid is being inspected, the bus side needs to be grounded to prevent accidental power transmission and harm to construction workers. In addition, if there is electricity in other intervals on the line, there will be a large induced voltage on the bus, which will also injure construction workers if touched.

[0005] The C-GIS busbar equipment cabinets currently used in 10kV power transmission and distribution systems are mostly used to measure busbar voltage. If busbar grounding and separation and combination functions are to be achieved, it is usually necessary to install an additional C-GIS product, which not only increases the floor space of the distribution room, but also causes a waste of equipment costs. Utility Model Content

[0006] The purpose of the utility model is to provide a C-GIS busbar equipment cabinet with a busbar grounding disconnector and close switch. A single device can realize functions such as busbar control, protection, measurement, monitoring, and communication, and can also realize busbar grounding operation. Compared with the existing technology, it can save space in the distribution room and provide good safety guarantee for operators.

[0007] The technical solution of the utility model is:

[0008] A C-GIS busbar equipment cabinet with a main busbar grounding splitter and close switch, comprising a cabinet body, the cabinet body having an air chamber, a mechanism chamber, a small busbar chamber, a secondary instrument chamber and a cable chamber, a three-position isolating switch is arranged in the air chamber of the cabinet body, a three-position operating mechanism of the three-position isolating switch is arranged in the mechanism chamber adjacent to the air chamber, a busbar grounding splitter and close switch is arranged in the air chamber, the busbar grounding splitter and close switch is located above the three-position isolating switch, the busbar grounding splitter and close switch comprises a grounding moving contact tube, a grounding moving contact slidably connected in the grounding moving contact tube, a grounding static contact tube fixedly connected to the grounding moving contact tube, and a grounding static contact fixedly arranged in the grounding static contact tube;

[0009] The grounding static contact tube is a black insulating tube;

[0010] The grounding static contact is fixedly embedded in the partition between the air chamber and the mechanism chamber, and a sealing member is provided at the connection;

[0011] The busbar grounding operating mechanism of the busbar grounding opening and closing switch is fixedly arranged in the mechanism room, and the busbar grounding operating mechanism is threadedly connected with the grounding moving contact through the center of the grounding static contact via a transmission screw;

[0012] The outer side of the ground contact tube is fixedly connected to the copper conductive jacket, the copper conductive jacket is connected to the static contact of the three-position disconnector through a copper bar, and the main busbar is also fixedly connected to the copper bar.

[0013] Furthermore, the copper conductive jacket is fixedly connected to the inner wall of the air chamber through an insulator.

[0014] Furthermore, the grounding static contact is connected to the protective grounding busbar of the cabinet body.

[0015] Furthermore, a density relay is fixedly arranged in the mechanism chamber, and a gas interface of the density relay is connected to the gas chamber.

[0016] The utility model adopting the above technical solution can bring the following beneficial effects:

[0017] The utility model provides a C-GIS busbar equipment cabinet with a main busbar grounding disconnecting and closing switch. Through the busbar grounding switch arranged in the gas chamber, it can not only realize the functions of busbar control, protection, measurement, monitoring, communication and the like, but also realize busbar grounding operation, which has the advantages of saving space in the distribution room and providing good safety guarantee advantages for operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2It is a schematic diagram of the opening and closing states of the busbar grounding switch and the three-position disconnecting switch during normal operation of the utility model;

[0020] Figure 3 It is a schematic diagram of the opening and closing states of the busbar grounding switch and the three-position isolating switch during maintenance of the utility model.

[0021] In the figure, 1-cabinet body; 2-three-position isolating switch; 3-busbar grounding opening and closing switch; 4-partition; 5-copper conductive jacket; 6-insulator; 7-density relay; 11-gas chamber; 21-mechanism chamber; 31-grounding moving contact tube; 32-grounding static contact tube; 41-small busbar chamber; 42-secondary instrument chamber; 43-cable chamber; 311-grounding moving contact, 321-grounding static contact; 431-American elbow-type PT plug; 432-voltage transformer; 433-European T-type plug; 434-connecting cable. DETAILED DESCRIPTION

[0022] like Figure 1-3 As shown, a C-GIS busbar equipment cabinet with a main busbar grounding opening and closing switch comprises a cabinet body 1, wherein a three-position disconnecting switch 2 is arranged in an air chamber 11 of the cabinet body 1, and a three-position operating mechanism of the three-position disconnecting switch 2 is arranged in a mechanism chamber 21 adjacent to the air chamber 11. The cabinet body 1 also has a small busbar chamber 41, a secondary instrument chamber 42 and a cable chamber 43, wherein a control small busbar is laid in the small busbar chamber 41, and secondary components, instruments, opening and closing control and indicating devices are arranged in the secondary instrument chamber 42; an American elbow PT plug 431, a voltage transformer 432, and a European T-type plug 433 are arranged in the cable chamber 43, Connecting cable 434; the above conventional structures are used to realize bus control, protection, measurement, monitoring and communication functions, and the above structures are the same as the prior art of the utility model, except that a bus grounding splitter and closeer switch 3 is arranged in the gas chamber 11, and the bus grounding splitter and closeer switch 3 is located above the three-position disconnector 2, and the bus grounding splitter and closeer switch 3 includes a grounding moving contact tube 31, a grounding moving contact 311 slidably connected in the grounding moving contact tube 31, a grounding static contact tube 32 fixedly connected to the grounding moving contact tube 31, and a grounding static contact 321 fixedly arranged in the grounding static contact tube 32;

[0023] It should be noted that the grounding static contact tube 32 is a black insulating tube to ensure reliable insulation between the grounding static contact tube 32 and the grounding movable contact tube 31 and the grounding static contact 321;

[0024] The grounding static contact 321 is fixedly embedded in the partition 4 between the air chamber 11 and the mechanism chamber 21, and a seal is provided at the connection. The grounding static contact 321 is connected to the protective grounding busbar of the cabinet body 1. When the grounding moving contact 311 and the grounding static contact 321 are in the closed position, the main busbar is grounded;

[0025] The busbar grounding operating mechanism of the busbar grounding opening and closing switch 3 is fixedly arranged in the mechanism chamber 21, and the busbar grounding operating mechanism is threadedly connected with the grounding movable contact 311 through the center of the grounding static contact 321 through the transmission screw;

[0026] An insulating member is provided at the connection between the grounding static contact tube 32 and the grounding moving contact tube 31 and at the connection between the grounding static contact tube 32 and the grounding static contact 321;

[0027] The outer side of the grounding moving contact tube 31 is fixedly connected to the copper conductive jacket 5, the copper conductive jacket 5 is connected to the static contact of the three-position disconnector 2 through a copper bar, and the main busbar is also fixedly connected to the copper bar.

[0028] Furthermore, the copper conductive jacket 5 is fixedly connected to the inner wall of the air chamber 11 through the insulator 6 .

[0029] Furthermore, a density relay 7 is fixedly arranged in the mechanism chamber 21, and the gas interface of the density relay 7 is connected to the gas chamber 11 for detecting the SF in the gas chamber 11. 6 Whether the gas pressure meets the pressure specified in the operating procedures.

[0030] Equipment operation status: First, check whether the needle of the density relay 7 is within the rated pressure mark range. If it is lower than the rated pressure gauge value, operation is prohibited. Secondly, the grounding indication position of the busbar grounding operating mechanism is in the open position (the grounding moving contact 311 is in the Figure 2 Then close the cable room door, and then the operator operates the three-position disconnector 2, so that its moving contact and static contact are combined, and the equipment starts to run;

[0031] Equipment maintenance status: First, check whether the needle of density relay 1 is within the rated pressure mark range. If it is lower than the rated pressure gauge value, operation is prohibited. Secondly, the grounding indication position of the busbar grounding operating mechanism is in the open position (moving contact 311 is in Figure 2 Then the operator operates the three-position disconnector 2 so that its moving contact contacts the grounding contact (its moving contact is in Figure 3 The three-position isolating switch 2 is in the grounded state. At this time, the American elbow PT plug 431, the voltage transformer 432, the European T-type plug 433, the connecting cable 434 and other primary components in the cable room of the cabinet body 1 are inspected and maintained;

[0032] Busbar side inspection status: The needle of density relay 1 is within the rated pressure mark range; check that the main transformer incoming line cabinet of this line is in the open position, and the main transformer incoming line grounding switch is in the closed position; check the isolating switches of each outgoing line cabinet and section isolation cabinet to ensure that they are in the open position, check the live display of the busbar grounding cabinet, if it shows no power, it is allowed to close the busbar grounding switch; at this time, the grounding indication position of the busbar grounding operating mechanism is in the open position (moving contact 311 is in Figure 2 Then, the busbar grounding operating mechanism is operated so that the grounding indication position of the busbar grounding operating mechanism is in the grounding position (the moving contact 311 is in the Figure 3 The main bus is now connected to the grounding grid through the main grounding of the cabinet body 1; the bus grounding switch 2 completes the bus grounding and can be repaired.

[0033] The utility model does not change the original volume of the existing C-GIS busbar equipment cabinet, and arranges a busbar grounding operation structure above the three-position operating mechanism in the mechanism chamber 21, and arranges a busbar grounding switch 3 above the three-position isolating switch in the gas chamber 11. The busbar grounding operation structure is used to drive the grounding movable contact 311 of the busbar grounding switch 3, so as to realize the busbar grounding separation and combination function of the utility model, and provide a new integrated solution with small footprint, economy, practicality, safety and reliability for the operation, inspection and maintenance of the power grid.

Claims

1. A C-GIS busbar equipment cabinet with a main busbar grounding disconnector, comprising a cabinet body (1), wherein the cabinet body (1) has an air chamber (11), a mechanism chamber (21), a small busbar chamber (41), a secondary instrument chamber (42) and a cable chamber (43), wherein a three-position disconnector (2) is arranged in the air chamber (11), and a three-position operating mechanism of the three-position disconnector (2) is arranged in the mechanism chamber (21) adjacent to the air chamber (11), characterized in that: A busbar grounding opening and closing switch (3) is arranged in the air chamber (11), and the busbar grounding opening and closing switch (3) is located above the three-position disconnector (2). The busbar grounding opening and closing switch (3) comprises a grounding movable contact tube (31), a grounding movable contact (311) slidably connected in the grounding movable contact tube (31), a grounding stationary contact tube (32) fixedly connected to the grounding movable contact tube (31), and a grounding stationary contact (321) fixedly arranged in the grounding stationary contact tube (32); The grounding static contact tube (32) is a black insulating tube; The grounding static contact (321) is fixedly embedded in the partition (4) between the air chamber (11) and the mechanism chamber (21), and a sealing member is provided at the connection; The busbar grounding operating mechanism of the busbar grounding opening and closing switch (3) is fixedly arranged in the mechanism chamber (21), and the busbar grounding operating mechanism is threadedly connected to the grounding movable contact (311) through a transmission screw passing through the center of the grounding static contact (321); The outer side of the grounding moving contact tube (31) is fixedly connected to the copper conductive jacket (5), the copper conductive jacket (5) is connected to the static contact of the three-position disconnector (2) through a copper busbar, and the main busbar is also fixedly connected to the copper busbar.

2. The C-GIS busbar equipment cabinet with a main busbar grounding opening and closing switch according to claim 1 is characterized in that: The copper conductive jacket (5) is fixedly connected to the inner wall of the air chamber (11) via an insulator (6).

3. The C-GIS busbar equipment cabinet with a main busbar grounding opening and closing switch according to claim 1 is characterized in that: The grounding static contact (321) is connected to the protective grounding busbar of the cabinet body (1).

4. The C-GIS busbar equipment cabinet with a main busbar grounding opening and closing switch according to claim 1 is characterized in that: A density relay (7) is fixedly arranged in the mechanism chamber (21), and a gas interface of the density relay (7) is in communication with the gas chamber (11).

Images