Gas insulated switchgear with parallel bus system

Abstract

The utility model discloses a gas insulated switchgear with a parallel bus system, which comprises an all-insulated solid copper pipe bus, a bus connector, an outer cone sleeve, a current transformer, a first bus coupler cabinet, a second bus coupler cabinet, a first isolation cabinet and a second isolation cabinet which are mutually combined for use, and the current transformer is arranged on the basis of the existing 2500 and below main bus technology. Through a parallel arrangement mode of all parts, a high-current bus system of 4000 A and above is realized, and meanwhile, a bus coupler isolation system of 4000 A and above is realized on the basis of the current circuit breaker with the rated current of 2000 A / 2500A.

Description

Technical Field

[0001] The utility model relates to the field of busbar systems, in particular to a gas-insulated switchgear with a parallel busbar system. Background Art

[0002] The main busbar system of the single-gas box main busbar top-parallel inflatable switchgear is a fully insulated solid copper tube busbar. The main busbar is connected to the branch system in the switchgear gas chamber through a three-way and four-way connector through an outer cone bushing. Due to the temperature rise limit, the rated current of a single group of fully insulated cabinet-top copper tube busbars in the industry can only reach 3150A. Therefore, the cabinet-top insulated busbar limits the busbar system specifications of the medium-voltage gas-insulated switchgear; but the medium-voltage switchgear industry has an increasing demand for 4000A busbar systems. Therefore, the industry is in urgent need of 4000A and above main busbar system solutions.

[0003] For example, a Chinese patent with publication number CN203218714U discloses a ring network cabinet busbar coupling structure, including parallel ring network cabinets and outlet terminal bushings and busbar connectors respectively arranged above the ring network cabinets. The top of the ring network cabinet is provided with a bushing hole, and the outlet terminal bushing is arranged in the bushing hole. The busbar connector includes a first connecting section and a second connecting section perpendicular to the first connecting section. The first connecting section and the second connecting section are interconnected. The first connecting section of the busbar connector is fixedly connected to the outlet terminal bushing, and the second connecting sections of two adjacent busbar connectors are arranged relatively. The utility model of the ring network cabinet busbar coupling structure does not require high accuracy in the position of the bushings of the two cabinets that need to be combined; does not require high horizontal height of the installation base surface of the cabinet body; and requires relatively low skills of operators who implement the cabinet combination.

[0004] For example, a Chinese patent with publication number CN113363860A discloses a 12kV / 4000A high-current gas-insulated metal-enclosed switchgear, which overcomes the problems of complex structure, large size and low heat dissipation efficiency in the prior art. It is characterized in that a heat dissipation pipe is installed on the gas box shell to form a natural convection heat exchange structure, a top heat dissipation box is installed on the top of the gas box shell, a direct-acting three-position double-set disconnector is connected to the lower end of the main busbar in the gas box shell, and an arc extinguishing chamber moving end soft connection is connected below the direct-acting three-position double-set disconnector.

[0005] For another example, a Chinese patent with publication number CN215071324U discloses a dual-voltage gas-insulated enclosed switchgear, including a control cabinet, a three-phase common box main bus, a circuit breaker, a circuit breaker mechanism, a current transformer, a third disconnector assembly, a fast grounding switch assembly, a voltage transformer, a cable terminal, a branch bus, a fourth disconnector assembly, a first disconnector assembly and a second disconnector assembly; the voltage transformer includes two groups of low-voltage coils; when the operating voltage of the gas-insulated enclosed switchgear is a first preset voltage, the two groups of low-voltage coils are connected in parallel and output; when the operating voltage of the gas-insulated enclosed switchgear is a second preset voltage, the two groups of low-voltage coils are connected in series and output.

[0006] In summary, the existing insulating switchgear has many disadvantages. Due to the temperature rise limitation, the rated current of a single group of fully insulated cabinet-top copper tube busbars in the industry can only reach 3150A. Therefore, the cabinet-top insulating busbar limits the busbar system specifications of the medium-voltage gas-insulated switchgear. However, the medium-voltage switchgear industry has an increasing demand for 4000A busbar systems, so the industry urgently needs supporting equipment solutions for 4000A and above main busbar systems. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a gas insulated switchgear with a parallel busbar system to solve the above problems.

[0008] In order to achieve the above objectives, the utility model is implemented through the following technical solutions.

[0009] A gas-insulated switchgear with a parallel busbar system, comprising a fully insulated solid copper tube busbar, a busbar connector, an outer cone bushing, a current transformer, a first busbar coupling cabinet, a second busbar coupling cabinet, a first isolation cabinet, and a second isolation cabinet, wherein the first busbar coupling cabinet, the second busbar coupling cabinet, the first isolation cabinet, and the second isolation cabinet are all provided with a gas box body, and a copper bar is provided inside the gas box body, and the copper bars are arranged in parallel, and the fully insulated solid copper tube busbar is respectively connected to the copper bar inside the gas box body through a busbar connector and an outer cone bushing, and three current transformers are provided, and are respectively connected to the fully insulated solid copper tube busbar, and based on the existing 2500 and below main busbar technology, a high current busbar system of 4000A and above is realized by arranging various components in parallel, and at the same time, a busbar isolation system of 4000A and above is realized based on the current rated current 2000A / 2500A circuit breaker.

[0010] Preferably, the fully insulated solid copper tube busbar includes a first solid insulated busbar of phase A, a second solid insulated busbar of phase A, a first solid insulated busbar of phase B, a second solid insulated busbar of phase B, a first solid insulated busbar of phase C, and a second solid insulated busbar of phase C.

[0011] Preferably, the A-phase first solid insulated busbar and the A-phase second solid insulated busbar are respectively connected to the copper bars arranged in parallel inside the gas box body through a busbar connector and an outer cone bushing.

[0012] Preferably, the current transformer is connected to the A-phase first solid insulated busbar and the A-phase second solid insulated busbar.

[0013] Preferably, the B-phase first solid insulated busbar and the B-phase second solid insulated busbar are respectively connected to the copper bars arranged in parallel inside the gas box body through a busbar connector and an outer cone bushing.

[0014] Preferably, the current transformer is connected to the first solid insulated busbar of phase B and the second solid insulated busbar of phase B.

[0015] Preferably, the C-phase first solid insulated busbar and the C-phase second solid insulated busbar are respectively connected to the copper busbars arranged in parallel inside the gas box body through a busbar connector and an outer cone bushing.

[0016] Preferably, the current transformer is connected to the first solid insulated busbar of the C phase and the second solid insulated busbar of the C phase.

[0017] Compared with the prior art, the utility model discloses a gas insulated switchgear with a parallel busbar system, including a fully insulated solid copper tube busbar, a busbar connector, an outer cone bushing, a current transformer, a first busbar cabinet, a second busbar cabinet, a first isolation cabinet, and a second isolation cabinet. The eight are used in combination with each other to play a role. Based on the existing 2500 and below main busbar technology, a large current busbar system of 4000A and above is realized through the parallel arrangement of various components. At the same time, a busbar isolation system of 4000A and above is realized based on the current rated current 2000A / 2500A circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a gas-insulated switchgear with a parallel busbar system according to the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a gas-insulated switchgear with a parallel busbar system according to the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of Example 2 of the utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example 1

[0023] A gas insulated switchgear with a parallel busbar system, comprising a fully insulated solid copper tube busbar 1, a busbar connector 2, an outer cone bushing 3, a current transformer 4, a first busbar cabinet 5, a second busbar cabinet 6, a first isolation cabinet 7, and a second isolation cabinet 8. The first busbar cabinet 5, the second busbar cabinet 6, the first isolation cabinet 7, and the second isolation cabinet 8 are all provided with a gas box body, and a copper bar is provided inside the gas box body, and the copper bars are arranged in parallel. The fully insulated solid copper tube busbar 1 is respectively connected to the copper bar inside the gas box body through the busbar connector 2 and the outer cone bushing 3. Three current transformers 4 are provided and are respectively connected to the fully insulated solid copper tube busbar 1. The fully insulated solid copper tube busbar 1 comprises a first solid insulated busbar 11 of phase A, a second solid insulated busbar 12 of phase A, a first solid insulated busbar 13 of phase B, a second solid insulated busbar 14 of phase B, a first solid insulated busbar 15 of phase C, and a second solid insulated busbar 16 of phase C. Line 16, the A-phase first solid insulated busbar 11 and the A-phase second solid insulated busbar 12 are respectively connected to the copper bars arranged in parallel inside the gas box body through the busbar connector 2 and the outer cone bushing 3, the current transformer 4 is connected to the A-phase first solid insulated busbar 11 and the A-phase second solid insulated busbar 12, the B-phase first solid insulated busbar 13 and the B-phase second solid insulated busbar 14 are respectively connected to the copper bars arranged in parallel inside the gas box body through the busbar connector 2 and the outer cone bushing 3, the current transformer 4 is connected to the B-phase first solid insulated busbar 13 and the B-phase second solid insulated busbar 14, the C-phase first solid insulated busbar 15 and the C-phase second solid insulated busbar 16 are respectively connected to the copper bars arranged in parallel inside the gas box body through the busbar connector 2 and the outer cone bushing 3, and the current transformer 4 is connected to the C-phase first solid insulated busbar 15 and the C-phase second solid insulated busbar 16.

[0024] The copper bars are used to short-circuit each phase in parallel inside the gas box body, and the rated current of the main busbar system is twice that of a single busbar, so as to realize a main busbar system of 4000A and above. The rated current of the cabinet and circuit breaker in the industry can generally only reach 3150A. When the rated current of the main busbar is required to be greater than or equal to 4000A, the busbar coupling cabinet and isolation cabinet cannot meet the main busbar current. For this reason, two sets of busbar coupling cabinets and isolation cabinets are used, namely the first busbar coupling cabinet 5, the second busbar coupling cabinet 6, the first isolation cabinet 7, and the second isolation cabinet 8. Figure 3 The two sets of busbars and isolation cabinets are arranged in parallel. A set of current transformers 4 is used to simultaneously protect the two sets of fully insulated solid copper tube busbars 1 in parallel, and to simultaneously control the circuit breaker actions of the two busbars and isolation cabinets.

[0025] Example 2

[0026] Under the condition that other technical features remain unchanged, the parallel busbar system can also be connected to the inside of the gas box body by the A-phase first solid insulated busbar 11, the A-phase second solid insulated busbar 12, the B-phase first solid insulated busbar 13, the B-phase second solid insulated busbar 14, the C-phase first solid insulated busbar 15, and the C-phase second solid insulated busbar 16 through the busbar connector 2 and the outer cone bushing 3. In the gas box body, each phase is short-circuited in parallel through a copper busbar, and the rated current of the main busbar system is twice that of a single busbar, thereby realizing a main busbar system of 4000A and above.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas insulated switchgear with a parallel busbar system, characterized in that: The invention comprises a fully insulated solid copper tube busbar (1), a busbar connector (2), an outer cone bushing (3), a current transformer (4), a first busbar coupling cabinet (5), a second busbar coupling cabinet (6), a first isolation cabinet (7), and a second isolation cabinet (8); the first busbar coupling cabinet (5), the second busbar coupling cabinet (6), the first isolation cabinet (7), and the second isolation cabinet (8) are all provided with a gas box body, and a copper bar is provided inside the gas box body, and the copper bars are arranged in parallel; the fully insulated solid copper tube busbar (1) is respectively connected to the copper bar inside the gas box body through the busbar connector (2) and the outer cone bushing (3); three current transformers (4) are provided, and are respectively connected to the fully insulated solid copper tube busbar (1).

2. The gas insulated switchgear with parallel busbar system according to claim 1, characterized in that: The fully insulated solid copper tube busbar (1) comprises a first solid insulated busbar (11) of phase A, a second solid insulated busbar (12) of phase A, a first solid insulated busbar (13) of phase B, a second solid insulated busbar (14) of phase B, a first solid insulated busbar (15) of phase C, and a second solid insulated busbar (16) of phase C.

3. The gas insulated switchgear with parallel busbar system according to claim 2, characterized in that: The A-phase first solid insulated busbar (11) and the A-phase second solid insulated busbar (12) are respectively connected to the copper bars arranged in parallel inside the gas box body via the busbar connector (2) and the outer cone bushing (3).

4. The gas insulated switchgear with parallel busbar system according to claim 3, characterized in that: The current transformer (4) is connected to the A-phase first solid insulated busbar (11) and the A-phase second solid insulated busbar (12).

5. The gas insulated switchgear with parallel busbar system according to claim 2, characterized in that: The B-phase first solid insulated busbar (13) and the B-phase second solid insulated busbar (14) are respectively connected to the copper bars arranged in parallel inside the gas box body via the busbar connector (2) and the outer cone bushing (3).

6. The gas insulated switchgear with parallel busbar system according to claim 5, characterized in that: The current transformer (4) is connected to a B-phase first solid insulated busbar (13) and a B-phase second solid insulated busbar (14).

7. The gas insulated switchgear with parallel busbar system according to claim 2, characterized in that: The C-phase first solid insulated busbar (15) and the C-phase second solid insulated busbar (16) are respectively connected to the copper bars arranged in parallel inside the gas box body through the busbar connector (2) and the outer cone bushing (3).

8. The gas insulated switchgear with parallel busbar system according to claim 7, characterized in that: The current transformer (4) is connected to a C-phase first solid insulated busbar (15) and a C-phase second solid insulated busbar (16).

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