Double-bus GIS system

Abstract

According to the double-bus GIS system, the arrangement structure of the buses in the GIS system in a double-bus arrangement mode in the prior art is changed, the linear disconnecting switches and the linear circuit breakers are adopted, the linear circuit breakers are arranged in the transverse direction, wiring ports of the linear circuit breakers are formed in the planes of the two ends, and the linear circuit breakers are arranged on the planes of the two ends. One end of the linear circuit breaker is connected with a main bus through linear disconnecting switches, the other end of the linear circuit breaker is provided with a T-shaped adapter, two adapter ports which are oppositely arranged are arranged in the longitudinal direction, the linear disconnecting switches are installed on the two adapter ports, and the end adapters are installed on the two linear disconnecting switches. The branch bus passes through the end part adapter and is arranged along the transverse direction, connection structures of all elements in the GIS are vertically arranged, and if a basin-type insulator needs to be installed, the basin-type insulator is also vertically arranged, so that transverse arrangement of the basin-type insulator is avoided, and potential safety hazards caused by dust deposition and discharge of the basin-type insulator are reduced.

Description

Technical Field

[0001] The invention relates to the field of double busbar arrangement, and in particular to a double busbar GIS system. Background Art

[0002] With the continuous expansion of the current power grid scale, the number of UHV substations has increased significantly. The layout of UHV substations in the prior art generally adopts a double busbar wiring layout and a double busbar layout. The double busbar wiring layout is disclosed in a Chinese invention patent with announcement number CN112086895B, which discloses a gas-insulated metal-enclosed switchgear and a GIS power station using the same, including a horizontally arranged horizontal circuit breaker. The horizontal circuit breaker is a cylindrical structure, and its two wiring ports are located at both ends of the arc surface of the horizontal circuit breaker and the openings are in the same direction. The high-position main bus is connected to one of the two wiring ports through an angular disconnector. A T-type adapter is installed on the other wiring port of the horizontal circuit breaker. The two adapter ports of the reverse opening of the T-type adapter are connected to an angular circuit breaker. The angular circuit breaker is connected to a longitudinally arranged branch bus through an angular adapter. The invention shortens the length of the GIS system in the double busbar wiring layout in the horizontal direction through three angular circuit breakers and two adapters, and reduces the footprint of the GIS system.

[0003] However, the problem with this technical solution is that the GIS system configured in this way transfers the high-level busbar with the low-level circuit breaker. There are multiple downward docking positions in the GIS system. If pot-type insulators are required at these positions, horizontally arranged pot-type insulators are used. However, horizontally arranged pot-type insulators are prone to dust accumulation and discharge, posing a major safety hazard. Summary of the invention

[0004] The object of the present invention is to provide a double-busbar GIS system to solve the problem of dust accumulation and discharge in horizontally arranged pot-type insulators in the prior art GIS system, which reduces the safety performance of the equipment.

[0005] To achieve the above-mentioned purpose, the present invention provides a double-bus GIS system, including a linear disconnector and a linear circuit breaker, wherein the docking ports of the linear disconnector and the linear circuit breaker are both located at both ends of their length direction, and the linear circuit breaker is arranged as a whole in the transverse direction, and the docking port at one end is directly or indirectly connected to the linear disconnector and connected in series to the main bus; the connection port at the other end is directly or indirectly connected to a T-type adapter, and the two adapters arranged in opposite directions on the T-type adapter are arranged in the longitudinal direction and the linear disconnector is installed on both adapters, and the two linear disconnectors connected to the T-type adapter are also installed with end adapters for connecting branch busbars, and the two branch busbars extend in the transverse direction.

[0006] Furthermore, a displacement compensation structure is installed between the linear circuit breaker and the T-shaped adapter connected to the linear circuit breaker.

[0007] Furthermore, the displacement compensation structure is a bellows expansion joint.

[0008] Furthermore, a current transformer is installed between the linear circuit breaker and the linear disconnector connected to the main bus, and a current transformer is also installed between the linear circuit breaker and the T-type adapter.

[0009] Furthermore, a grounding switch is also connected between the linear isolating switch directly or indirectly connected to the main bus and the main bus, and two docking ports of the grounding switch are arranged opposite to each other in the transverse direction.

[0010] Furthermore, the double-bus GIS system includes a bracket supporting the busbar tube, on which an SF6 density relay is installed. The SF6 density relay includes an instrument and a calibration valve, which connect the gas interface on the busbar tube with the calibration valve through a gas pipe. The calibration valve is normally open to detect the concentration of SF6 in the GIS busbar in real time. An insulating pad is installed at the connection between the calibration valve and the bracket.

[0011] Furthermore, a wiring slot is fixed on the bracket, and the wiring slot is grounded; both the grounding switch and the linear isolating switch are provided with a mechanism aviation plug, and the power supply control cable plugged into the mechanism aviation plug is led out through the wiring slot.

[0012] Furthermore, displacement compensation structures are connected in series to both branch busbars.

[0013] Furthermore, each phase main bus is equipped with a vertically extending outlet bushing, which is supported and fixed by a vertical support frame. An underground bus is provided at the vertical support frame of the three-phase main bus, and each outlet bushing is electrically connected to the underground bus to achieve grounding.

[0014] Beneficial effects: The present invention changes the arrangement structure of the busbars of the GIS system in the prior art, and provides a double-busbar GIS system, wherein all disconnectors are linear disconnectors, and the circuit breakers are cylindrical circuit breakers and are arranged in the transverse direction. The wiring ports of the circuit breakers are arranged on planes on both sides, one end of the cylindrical circuit breaker is connected to the linear disconnector and is directly or indirectly connected to the main busbar, and the other end is directly or indirectly connected to the T-type adapter, and two adapter ports of the T-type adapter are arranged in the longitudinal direction in opposite directions and the linear disconnectors are installed on the two adapter ports, and the two linear disconnectors are also installed with T-type adapters for supporting branch busbars, and the two branch busbars pass through the T-type adapters installed on the linear disconnectors and are arranged in the transverse direction; in the GIS system arranged in this way, each docking port is vertically docked, and if a pot-type insulator needs to be installed at the docking position, the pot-type insulator must be installed vertically, thereby avoiding the use of a pot-type insulator arranged in a transverse direction, reducing the risk of dust accumulation and discharge of the pot-type insulator, and improving the safety performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structural top view of the double busbar GIS system; Figure 2 The main view of the overall structure of the double-busbar GIS system (only one outgoing bushing for the main busbar connection is retained in the figure, and the outgoing bushings for the other two main busbar connections are hidden); Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the line unit at a in the middle; Figure 4 It is a schematic diagram of the wiring structure of the grounding switch and the linear isolating switch; Figure 5 This is a schematic diagram of the connection structure of the SF6 density relay; Figure 6 for Figure 1 A schematic diagram of the enlarged structure of the line unit at b in the middle; Figure 7 It is a top view of the grounding structure of the high-voltage conductor shell; Figure 8 This is the front view of the grounding structure of the high-voltage conductor shell.

[0016] In the figure: 1. Linear disconnector; 2. Linear circuit breaker; 4. Main bus; 5. T-type adapter; 51. End adapter; 6. Branch bus; 7. Bracket; 8. Basin insulator; 9. Current transformer; 10. Earthing switch; 11. Mechanism aviation plug; 12. Power supply control cable; 14. Wiring trough; 15. Instrument; 16. Calibration valve; 17. Gas pipe; 18. Insulation pad; 19. Bellows expansion joint; 21. Underground bus; 22. Vertical support frame; 23. Outlet bushing; 24. Bus bar; 25. Gas interface. DETAILED DESCRIPTION

[0017] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0018] The principle and concept of the present invention is to provide a double-bus GIS system, which uses a linear isolating switch and a linear circuit breaker, and the docking ports of the isolating switch and the circuit breaker are arranged at both ends in the length direction. One end of the linear circuit breaker is connected to the linear isolating switch and is directly or indirectly connected to the busbar through the isolating switch, and the other end is directly or indirectly connected to a T-type adapter. The two adapters arranged in opposite directions on the T-type adapter are arranged in the longitudinal direction and the above-mentioned linear isolating switches are installed on both adapters. The isolating switch is installed with an end adapter for installing a branch busbar, and the branch busbar passes through the end adapter and extends in the transverse direction; in the double-bus GIS system arranged in this way, all components extend transversely and are in the same horizontal plane, and the connection structures of all components are arranged vertically. The GIS system arranged in this way can only install pot insulators vertically in the vertically arranged connection structure, which avoids the dust discharge on the surface of the horizontally installed pot insulator affecting the GIS system, thereby improving the safety of the GIS system.

[0019] Based on the above principles, in a basic embodiment, as Figure 1-3 In the embodiment provided, the double-busbar GIS system comprises a linear isolating switch 1 and a linear circuit breaker 2, the docking ports of the linear isolating switch 1 and the linear circuit breaker 2 are arranged at both ends in the length direction, the linear circuit breaker 2 is horizontally mounted on a bracket 7, one end is connected to the linear isolating switch 1, and is directly or indirectly connected in series with the main bus 4, and the other end is directly or indirectly connected to a T-type adapter 5, the two adapters arranged in opposite directions on the T-type adapter 5 are arranged in the longitudinal direction, and the two adapters are docked with the above-mentioned linear isolating switch 1, connected to The two linear disconnectors 1 on the T-type adapter 5 are also equipped with end adapters 51 for installing the branch busbar 6. The branch busbar 6 passes through the end adapter 51 and extends in the lateral direction. The GIS system arranged in this way extends in the lateral direction, and the docking connection structures of all GIS components are all arranged vertically. At the connection structure where the pot-type insulator 8 needs to be installed, the pot-type insulator 8 can only be arranged vertically. The surface of the vertically arranged pot-type insulator 8 is not easy to accumulate dust, which avoids the discharge caused by dust accumulation on the surface of the pot-type insulator arranged horizontally, thereby improving the safety of the GIS system.

[0020] Based on the above embodiments, in one embodiment, Figure 3In the provided embodiment, a bellows expansion joint 19 is installed between the linear circuit breaker 2 and the T-type adapter 5 connected to the linear circuit breaker 2 to balance the lateral displacement of the linear circuit breaker 2 and the T-type adapter 5 due to thermal expansion and contraction of the busbar.

[0021] Based on the above embodiments, in one embodiment, Figure 1-3 In the provided embodiment, a current transformer 9 is further installed between the linear circuit breaker 2 and the linear disconnector 1 connected to the main bus 4, and a current transformer 9 is also installed between the linear circuit breaker 2 and the T-type adapter 5, for real-time monitoring of current data at both ends of the linear circuit breaker 2. In another embodiment, the current transformer 9 may be installed only between the linear circuit breaker 2 and the T-type adapter 5, and the current transformer 9 for monitoring the current on the main bus 4 may be installed at the connection between the main bus 4 and the outlet bushing 23.

[0022] Based on the above embodiments, in one embodiment, Figure 3 , Figure 4 In the provided embodiment, a grounding switch 10 is further installed between the linear isolating switch 1 connected to the main bus 4 and the main bus 4 .

[0023] Based on the above embodiments, in one embodiment, Figure 5 In the provided embodiment, an SF6 density relay is installed on the bracket 7, including a calibration valve 16 and an instrument 15 installed on the calibration valve 16. The calibration valve 16 is connected to the gas interface 25 on the busbar through an air pipe 17. The calibration valve 16 is normally opened to monitor the concentration of SF6 in the busbar; the calibration valve 16 is installed on the bracket 7 by bolts, and an insulating pad 18 is provided on the connecting surface of the calibration valve 16 and the bracket 7 to achieve insulation of the calibration valve 16 to prevent the calibration valve 16 from overheating when it is powered on and damaging the instrument 15.

[0024] Based on the above embodiments, in one embodiment, Figure 4 In the provided embodiment, a wiring slot 14 is also fixedly installed on the bracket, and a mechanical aviation plug 11 is provided on the grounding switch 10 and the linear isolating switch 1. The power supply control cable 12 inserted into the mechanical aviation plug 11 is connected to the wiring slot 14, and the power supply control cable 12 of the grounding switch 10 and the linear isolating switch 1 is led out through the wiring slot 14; the outer shell of the wiring slot 14 is grounded.

[0025] Based on the above embodiments, in one embodiment, Figure 1 , Figure 2 and Figure 6 In the provided embodiment, a bellows expansion joint 19 is installed between two branch busbars 6 connected on the same axis to balance the lateral displacement of the outer shell of the branch busbar 6 caused by thermal expansion and contraction of the branch busbar 6 .

[0026] Based on the above embodiments, in one embodiment, Figure 1 , Figure 2 , Figure 7 , Figure 8 In the provided embodiment, one end of the three-phase main busbar 4 is connected to the corresponding outgoing bushing 23, and the outgoing bushing 23 is fixed by a vertical support frame 22. An underground bus 21 is pre-buried in the ground at the bottom of the vertical support frame 22. The outgoing bushing 23 is electrically connected to the underground bus 21 through a bus line 24 to ensure that the vertical support frame 22 and the outgoing bushing 23 are grounded and insulated.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A double busbar GIS system, characterized in that: It comprises a linear isolating switch and a linear circuit breaker, the butt joint ports of the linear isolating switch and the linear circuit breaker are both at the two ends in the length direction thereof, the linear circuit breaker is arranged as a whole in the transverse direction, the butt joint port at one end is directly or indirectly connected to the linear isolating switch and connected in series to the main bus; the connection port at the other end is directly or indirectly connected to a T-type adapter, the two adapter ports arranged in opposite directions on the T-type adapter are arranged in the longitudinal direction and the linear isolating switch is installed on both the adapter ports, the two linear isolating switches connected to the T-type adapter are also installed with end adapters for connecting branch busbars, and the two branch busbars extend in the transverse direction.

2. A double busbar GIS system according to claim 1, characterized in that: A displacement compensation structure is installed between the linear circuit breaker and the T-type adapter connected to the linear circuit breaker.

3. A double busbar GIS system according to claim 2, characterized in that: The displacement compensation structure is a bellows expansion joint.

4. A double busbar GIS system according to any one of claims 1 to 3, characterized in that: A current transformer is installed between the linear circuit breaker and the linear disconnector connected to the main bus, and a current transformer is also installed between the linear circuit breaker and the T-type adapter.

5. A double busbar GIS system according to claim 4, characterized in that: A grounding switch is also connected between the linear isolating switch directly or indirectly connected to the main bus and the main bus, and two docking ports of the grounding switch are arranged opposite to each other in the transverse direction.

6. A double busbar GIS system according to claim 5, characterized in that: The double-busbar GIS system includes a bracket supporting the busbar tube, on which an SF6 density relay is installed. The SF6 density relay includes an instrument and a calibration valve, which are connected to the gas interface on the busbar tube and the calibration valve through a gas pipe. The calibration valve is normally open to detect the concentration of SF6 in the GIS busbar in real time; an insulating pad is installed at the connection between the calibration valve and the bracket.

7. A double busbar GIS system according to claim 6, characterized in that: A wiring slot is also fixed on the bracket, and the wiring slot is grounded; both the grounding switch and the linear isolating switch are provided with a mechanism aviation plug, and the power supply control cable plugged into the mechanism aviation plug is led out through the wiring slot.

8. A double busbar GIS system according to any one of claims 1 to 3, characterized in that: Displacement compensation structures are connected in series on both branch busbars.

9. A double busbar GIS system according to any one of claims 1 to 3, characterized in that: Each phase main bus is equipped with a vertically extending outgoing bushing, which is supported and fixed by a vertical support frame. An underground bus is provided at the vertical support frame of the three-phase main bus, and each outgoing bushing is electrically connected to the underground bus to achieve grounding.

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