A high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion

Abstract

This invention discloses a high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion. The device includes a first working busbar, a first disconnecting switch, a standby working busbar, a second disconnecting switch, a grounding switch, a gas gap insulation unit, a circuit breaker, a current transformer, a three-position switch, a fast grounding switch, and an expansion port. The first disconnecting switch is connected to the output terminal of the first working busbar to form a first series output branch. The second disconnecting switch is connected to the output terminal of the standby working busbar to form a second series output branch. The second series output branch is connected in parallel with the first series output branch to form a first parallel output branch. One end of the grounding switch is connected to the first parallel output, and the other end is grounded. The first parallel output is connected in series with the gas gap insulation unit, circuit breaker, current transformer, three-position switch, and fast grounding switch to form a third series output branch. This device allows for expansion without power outages while ensuring safety.

Description

Technical Field

[0001] This invention relates to the field of substation technology, and in particular to a high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion. Background Technology

[0002] High-voltage GIS (Gas Insulated Switchgear) has been widely used in power systems, but more and more high-voltage GIS projects need to be constructed in phases.

[0003] In existing technologies, when expanding high-voltage GIS or conducting withstand voltage tests on standby bays, the original operating busbars need to be de-energized to prevent reverse superposition of overvoltages at both ends of the isolation break during the handover test. This is because excessive voltage may cause the break to discharge and break down, leading to a power grid accident. For the operating unit, coordinating the de-energization of the substation busbars means delays in project progress, waste of manpower and resources, and direct or indirect economic losses caused by the power outage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art by providing a high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion, so as to solve the problem that power outages are still required during uninterrupted power supply expansion while ensuring safety.

[0005] In a first aspect, the present invention provides a high-voltage GIS double busbar connection device for uninterrupted power supply expansion, comprising:

[0006] A first working bus and a first disconnecting switch, wherein the first disconnecting switch is connected to the output terminal of the first working bus to form a first series output branch;

[0007] A standby working bus and a second disconnecting switch, wherein the second disconnecting switch is connected to the output terminal of the standby working bus to form a second series output branch, and the second series output branch is connected in parallel with the first series output branch to form a first parallel output branch;

[0008] A grounding switch, one end of which is connected to the first parallel output branch, and the other end of which is grounded;

[0009] An expanded protection assembly is provided, comprising a gas gap insulation unit, a circuit breaker, a current transformer, a three-position switch, and a fast grounding switch. The fast grounding switch is used for opening or closing the fast grounding switch of the output line. The three-position switch is used for line isolation and line grounding on the outgoing side. The current transformer is used for current measurement and current protection on the outgoing side. The circuit breaker is used for opening and closing the output line. The gas gap insulation unit is used for insulating the first parallel output and the circuit breaker.

[0010] The first parallel output branch is connected in series with the gas gap insulation unit, circuit breaker, current transformer, three-position switch and fast grounding switch to form the third series output branch;

[0011] An expansion port is provided, which is connected to the output terminal of the third series output branch.

[0012] Furthermore, the gas gap insulation unit is a long gas insulation gap composed of an insulating shell and an insulating gas disposed inside the insulating shell. One end of the insulating shell is connected to the first parallel output branch and is used to insulate the first parallel output branch. The other end of the insulating shell is connected to the circuit breaker and is used to insulate the circuit breaker.

[0013] Furthermore, the insulating shell is made of mica, asbestos, or glass, and the insulating gas inside the insulating shell is clean air, nitrogen, or sulfur hexafluoride.

[0014] Furthermore, the circuit breaker is one of the following: oil circuit breaker, sulfur hexafluoride circuit breaker, vacuum circuit breaker, and compressed air circuit breaker.

[0015] Furthermore, the three-position switch is a three-position load switch.

[0016] Secondly, the present invention provides a substation comprising high-voltage GIS power distribution equipment, a proposed expansion of high-voltage GIS equipment, and the high-voltage GIS double busbar connection device for uninterrupted power supply expansion as described in the first aspect.

[0017] The input end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS equipment to be expanded.

[0018] Beneficial effects achieved:

[0019] In the high-voltage GIS double busbar connection device for uninterrupted power expansion of the present invention, the expansion protection component is composed of an expansion gas gap insulation unit, a circuit breaker, a current transformer, a three-position switch, and a fast grounding switch. It can ensure safety and eliminate the need for power outage during expansion. At the same time, by setting a first working busbar and a backup working busbar, the operational reliability after expansion is improved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the high-voltage GIS double busbar connection for uninterrupted power supply expansion in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the long gas gap in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram showing the replacement of the long gas gap with a conductor connection in an embodiment of the present invention;

[0023] Figure 4 This is a single-wire type with double busbars in an embodiment of the present invention;

[0024] Figure 5 A single-line diagram is provided for the reserved expansion interval of the double busbar connection in this embodiment of the invention.

[0025] Among them: 10, first working busbar; 11, first disconnecting switch; 20, standby working busbar; 21, second disconnecting switch; 30, grounding switch; 40, gas gap insulation unit; 50, circuit breaker; 60, current transformer; 70, three-position switch; 80, fast grounding switch; 100, expansion port; 200, expansion protection component. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] It is understood that the specific embodiments and accompanying drawings described herein are merely for explaining the invention and are not intended to limit the invention.

[0028] It is understood that, without conflict, the various embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] It is understood that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, while the parts unrelated to the present invention are not shown in the drawings.

[0030] It is understood that each unit or module involved in the embodiments of the present invention may correspond to only one entity structure, or may be composed of multiple entity structures, or multiple units or modules may be integrated into one entity structure.

[0031] It is understood that, without conflict, the functions and steps marked in the flowcharts and block diagrams of this invention may occur in a different order than that marked in the accompanying drawings.

[0032] It is understood that the flowcharts and block diagrams of this invention illustrate the possible architecture, functions, and operations of systems, apparatuses, devices, and methods according to various embodiments of this invention. Each block in the flowchart or block diagram may represent a unit, module, program segment, or code, containing executable instructions for implementing the specified function. Furthermore, each block or combination of blocks in the block diagram and flowchart can be implemented using a hardware-based system to achieve the specified function, or using a combination of hardware and computer instructions.

[0033] It is understood that the units and modules involved in the embodiments of the present invention can be implemented by software or by hardware. For example, the units and modules can be located in a processor.

[0034] When the inventors filed this application, they had studied single-line type of double busbar connection, single-line type of double busbar connection with reserved expansion bay, and double-break isolation of busbar disconnect switch:

[0035] Example 1:

[0036] This embodiment provides a high-voltage GIS double busbar connection device for uninterrupted power supply expansion. The device includes: a first working busbar 10, a first disconnecting switch 11, a spare working busbar 20, a second disconnecting switch 21, a grounding switch 30, an expansion port 100, and an expansion protection component 200. The expansion protection component 200 includes a gas gap insulation unit 40, a circuit breaker 50, a current transformer 60, a three-position switch 70, and a fast grounding switch 80.

[0037] The first disconnecting switch 11 is connected to the output terminal of the first working bus 11 to form a first series output branch;

[0038] The second disconnecting switch 21 is connected to the output terminal of the standby working bus 20 to form a second series output branch. The second series output is connected in parallel with the first series output to form a first parallel output branch.

[0039] One end of the grounding switch 30 is connected to the first parallel output branch, and the other end is grounded;

[0040] The first parallel output branch is connected in series with the gas gap insulation unit 40, circuit breaker 50, current transformer 60, three-position switch 70, and fast grounding switch 80 to form the third series output branch; wherein, the fast grounding switch 80 is used for opening or closing the fast grounding switch of the output line, the three-position switch 70 is used for line isolation and line grounding on the outgoing side, the outgoing side current transformer 60 is used for current measurement and current protection on the outgoing side, the circuit breaker 50 is used for opening and closing the output line, and the gas gap insulation unit 40 is used for insulating the first parallel output and the circuit breaker 50;

[0041] The expanded port 100 is connected to the third serial output branch.

[0042] Specifically, the gas gap insulation unit 40 is a long gas insulation gap consisting of an insulating shell and an insulating gas disposed within the insulating shell. One end of the insulating shell is connected to the first parallel output for insulating the first parallel output, and the other end of the insulating shell is connected to the circuit breaker for insulating the circuit breaker. The insulating shell is made of mica, asbestos, or glass, and the insulating gas inside the insulating shell is clean air, nitrogen, or sulfur hexafluoride. After the expansion and power frequency withstand voltage acceptance test are completed, the gas gap insulation unit will be modified to a conductor connection method.

[0043] Specifically, circuit breaker 50 is one of oil circuit breaker, sulfur hexafluoride circuit breaker, vacuum circuit breaker, or compressed air circuit breaker; three-position switch 70 is a three-position load switch; and fast grounding switch is a fast grounding switch with a switching action time of less than 0.15s.

[0044] In specific implementation, the gas gap insulation unit 40 can be a gas gap switch. The switching chamber of the gas gap switch uses clean air, nitrogen, or sulfur hexafluoride as the insulating medium between the first parallel output and the circuit breaker 50. When the gas gap switch is open, there is a gas gap between the first parallel output and the circuit breaker 50. When the gas gap switch is closed, the first parallel output and the circuit breaker 50 are directly connected, which is equivalent to a conductor connection.

[0045] To further enable uninterrupted power supply expansion, the high-voltage GIS double busbar connection device for uninterrupted power supply expansion also includes a controller. The controller is connected to the first disconnecting switch 11, the second disconnecting switch 21, the grounding switch 30, the gas gap insulation unit 40, the circuit breaker 50, the current transformer 60, the three-position switch 70, and the fast grounding switch 80, respectively, for controlling the first disconnecting switch 11, the second disconnecting switch 21, the grounding switch 30, the gas gap insulation unit 40, the circuit breaker 50, the current transformer 60, the three-position switch 70, and the fast grounding switch 80. In specific implementations, the controller can be a commercially available STM32 controller or an ATmega328 controller.

[0046] like Figure 1 As shown, the specific process of achieving uninterrupted expansion in this embodiment is as follows:

[0047] In the first phase of construction, the first working busbar 10, the standby working busbar 20, the first disconnecting switch 11, the second disconnecting switch 21, the grounding switch 30, and the high-insulation long gas gap 40 for expansion have been installed and put into operation. Specifically, the I busbar disconnecting switch 11 is in the open position, the II busbar disconnecting switch 21 is in the open position, the grounding switch 30 is in the open position, and the gas gap insulation unit 40 (i.e., the high-insulation long gas gap for expansion) is in the open position. The specific details of the high-insulation long gas gap for expansion are as follows: Figure 2 As shown.

[0048] The second phase involves long-term project expansion, including the installation and commissioning of expanded equipment. This includes circuit breaker 50, current transformer 60, three-position switch (used for isolation and grounding combination) 70, and fast grounding switch 80. At the start of the expansion, grounding switch 30 is closed to ensure the electrical safety of installation personnel. The expanded equipment is then installed sequentially. After basic commissioning of the expanded equipment is completed, a withstand voltage test is conducted. At this time, the gas gap insulation unit 40 (i.e., the high-insulation long gas gap used in the expansion) is in the open position, circuit breaker 50 is in the closed position, three-position switch 70 is in the isolation closed position, grounding switch is in the open position, and fast grounding switch 80 is in the open position.

[0049] The third phase involves long-term project expansion, including power frequency withstand voltage handover tests on the expanded equipment. These tests are conducted on the expanded bays from the expansion side. During the power frequency withstand voltage handover test, if the expanded section discharges to ground, the gas gap insulation unit 40 (i.e., the long gas gap with high insulation performance used in the expansion) will isolate it, preventing any impact on the energized busbars (including the first working busbar 10 and the standby working busbar 20). Even if the gas gap insulation unit 40 (i.e., the long gas gap with high insulation performance used in the expansion) breaks down, the grounding switch 30 is in the closed position, allowing the discharge current to flow directly to the ground, again preventing any impact on the energized busbars (including the first working busbar 10 and the standby working busbar 20).

[0050] The fourth stage is the commissioning of the expanded equipment. After the withstand voltage of the expanded bay is completed, the grounding switch 30 will be opened, and the gas gap insulation unit 40 (i.e., the long gas gap with high insulation performance for the expansion) will be modified to a conductor connection type (see...). Figure 3 Other operations are the same as normal dual-bus scheduling.

[0051] A typical double busbar connection with a single wire is shown below. Figure 4 A typical double busbar connection with reserved expansion bay single-line diagram is shown below. Figure 5 .Depend on Figure 4 and Figure 5It is known that if there is only one isolation break between the expanded bay and the operating busbar, the original operating busbar must be de-energized during the handover withstand voltage test of the GIS spare bay (mainly to prevent reverse superposition of overvoltages at both ends of the isolation break during the handover test, which may lead to discharge breakdown of the break and thus cause a power grid accident). For the operating unit, coordinating the de-energization of the substation busbar means delays in project progress, waste of manpower and resources, and direct or indirect economic losses caused by the power outage. Therefore, in the high-voltage GIS double busbar connection device for uninterrupted expansion in this embodiment, the outgoing side components, consisting of gas gap insulation units for expansion, circuit breakers, current transformers, three-position switches, and fast grounding switches, can ensure safety while allowing expansion without power outage. At the same time, by setting up a first working busbar and a spare working busbar, the operational reliability after expansion is improved.

[0052] Example 2:

[0053] Based on the same technical concept as Embodiment 1, this embodiment provides a substation, which includes high-voltage GIS power distribution equipment, a high-voltage GIS equipment to be expanded, and a high-voltage GIS double busbar connection device for uninterrupted power supply expansion as described in Embodiment 1, wherein: the input end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS equipment to be expanded.

[0054] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-voltage GIS double busbar connection device for uninterrupted power supply expansion, characterized in that, The device includes: The first working bus (10) and the first disconnecting switch (11) are connected to the output terminal of the first working bus (10) to form a first series output branch; A standby working bus (20) and a second disconnecting switch (21) are connected to the output terminal of the standby working bus (20) to form a second series output branch. The second series output branch is connected in parallel with the first series output branch to form a first parallel output branch. A grounding switch (30) is provided, one end of which is connected to the first parallel output branch, and the other end of which is grounded. An extended protection assembly (200) is provided, comprising a gas gap insulation unit (40), a circuit breaker (50), a current transformer (60), a three-position switch (70), and a fast grounding switch (80). The fast grounding switch (80) is used for opening or closing the fast grounding switch of the output line. The three-position switch (70) is used for line isolation and line grounding on the outgoing side. The current transformer (60) is used for current measurement and current protection on the outgoing side. The circuit breaker (50) is used for opening and closing the output line. The gas gap insulation unit (40) is used for insulating the first parallel output branch and the circuit breaker (50). The first parallel output branch is connected in series with the gas gap insulation unit (40), circuit breaker (50), current transformer (60), three-position switch (70), and fast grounding switch (80) to form the third series output branch; An expansion port (100) is provided, which is connected to the output terminal of the third series output branch.

2. The high-voltage GIS double busbar connection device for uninterrupted power supply expansion according to claim 1, characterized in that, The gas gap insulation unit (40) includes an insulating shell and a long gas insulating gap composed of insulating gas disposed within the insulating shell. One end of the insulating shell is connected to the first parallel output branch and is used to insulate the first parallel output branch. The other end of the insulating housing is connected to the circuit breaker (50) and is used to insulate the circuit breaker (50).

3. The high-voltage GIS double busbar connection device for uninterrupted power supply expansion according to claim 2, characterized in that, The insulating shell is made of mica, asbestos, or glass. The insulating gas inside the insulating shell is clean air, nitrogen, or sulfur hexafluoride.

4. The high-voltage GIS double busbar connection device for uninterrupted power supply expansion according to claim 1, characterized in that, The circuit breaker (50) is one of the following: oil circuit breaker, sulfur hexafluoride circuit breaker, vacuum circuit breaker, or compressed air circuit breaker.

5. The high-voltage GIS double busbar connection device for uninterrupted power supply expansion according to claim 1, characterized in that, The three-position switch (70) is a three-position load switch.

6. The high-voltage GIS double busbar connection device for uninterrupted power supply expansion according to claim 1, characterized in that, The fast grounding switch is a fast grounding switch with a switching action time of less than 0.15s.

7. A substation, characterized in that, This includes high-voltage GIS power distribution equipment, the proposed expansion of high-voltage GIS equipment, and the high-voltage GIS double busbar connection device for uninterrupted power supply expansion as described in any one of claims 1 to 6. The input end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double busbar connection device for uninterrupted power supply expansion is connected to the high-voltage GIS equipment to be expanded.

Images