A GIS cable terminal phase connection device

Abstract

A GIS cable terminal phase-splitting connection device relates to the technical field of high-voltage switch transmission equipment. The cable terminal phase-splitting connection device includes a phase-splitting busbar, a retractable busbar, an angle busbar, a single-phase cable terminal connection device, a horizontal bellows, and a vertical bellows. Compared with the conventional miniaturized GIS three-phase common box cable terminal connection device, the cable terminal phase-splitting connection device can adjust the position of the phase-splitting cable and the phase distance according to requirements, so as to adapt to more layout scenarios. The new type converts the GIS three-phase common box structure into a three-phase split box structure, meeting the requirements of matching with phase-splitting type cable terminals. At the same time, the spacing between the three groups of single-phase cable terminal connection devices can be changed by adjusting the compression amount of the horizontal bellows and the vertical bellows to match cable terminals with different phase spacings, thereby reducing the difficulty of installation and docking, and reducing the safety hazards caused by equipment size errors and installation errors.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switch power transmission equipment, in particular to a cable terminal phase-dividing connection device applied to a common box GIS. Background Art

[0002] Gas-insulated metal-enclosed switchgear (GIS for short) is a complete set of switchgear composed of electrical components such as circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, lightning arresters, busbars, bushings or cable terminal connection devices. Cable terminals are a major way of inlet and outlet lines for GIS, and cable terminal connection devices are devices that connect GIS and cable terminals. However, due to factors such as user requirements and site conditions, the layout of cable terminals and the spacing between phases are also different. When the cable terminal connection device is docked with the cable terminal, the difficulty of docking is increased due to the influence of the size errors and installation errors of each device, which seriously affects the safety and reliability of the equipment. Summary of the invention

[0003] In view of the problems existing in the background technology, the utility model provides a cable terminal connection device suitable for cable terminals of different layout types and different phase spacings, which effectively reduces the difficulty of installation and docking, reduces the safety hazards caused by equipment size errors and installation errors, and increases the safety and reliability of the equipment.

[0004] The purpose of the utility model is achieved through the following technical solutions: a GIS cable terminal phase-splitting connection device, including a phase-splitting busbar, in which three-phase cables are divided into different directions inside the phase-splitting busbar, one phase is directly downward, and the other two phases are horizontally divided to the left and right sides respectively; the unit structures connected on the left and right sides of the phase-splitting busbar are the same, and the unit structures are a horizontal retractable busbar, an angle busbar, a vertical retractable busbar, and a single-phase cable terminal connection device in sequence; the horizontal retractable busbar is provided with a horizontal corrugated pipe, and the vertical retractable busbar is provided with a vertical corrugated pipe; a single-phase cable terminal connection device is connected downward in the middle of the phase-splitting busbar.

[0005] Preferably, a contact is provided inside the transverse retractable busbar, and the depth of the internal conductor inserted into the contact is adjusted by compressing or releasing the horizontal bellows, thereby adjusting the width of the lateral extension of the unit structures on the left and right sides.

[0006] Preferably, a contact is provided inside the vertical retractable busbar, and the depth of the internal conductor inserted into the contact is adjusted by compressing or releasing the vertical bellows, thereby adjusting the vertical extension height of the left and right side unit structures.

[0007] Preferably, the upper end of the single-phase cable terminal connection device is a shielding terminal with an insulator, and the conductor passes through the shielding terminal of the insulator and is connected to the single-phase cable terminal inserted into the single-phase cable terminal connection device.

[0008] Preferably, the conductor in the single-phase cable terminal connection device is a detachable structure, one end of the conductor passes through the single-phase cable terminal connection device and is connected to the upper conductor part, and the other end is inserted into the single-phase cable terminal and is connected to the cable inside the single-phase cable terminal.

[0009] Preferably, a cable shielding terminal is provided at the end of the single-phase cable terminal inserted into the single-phase cable terminal connecting device.

[0010] The beneficial effects of the utility model are:

[0011] By setting up split-phase busbar, retractable busbar, corner retractable busbar, and single-phase cable terminal connection device, the GIS three-phase common box structure is converted into a three-phase split box structure, meeting the requirements for matching with split-phase type cable terminals. At the same time, by adjusting the compression of the horizontal and vertical corrugated pipes, the spacing of the three groups of single-phase cable terminal connection devices can be changed to match with cable terminals of different spacings. It effectively reduces the difficulty of installation and docking, reduces the safety hazards caused by equipment size errors and installation errors, and increases the safety and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the phase-by-phase connection device for the common-box GIS cable terminals.

[0013] Figure 2 Schematic diagram of the retractable busbar and horizontal bellows.

[0014] Figure 3 Schematic diagram of the corner busbar and vertical bellows.

[0015] Figure 4 This is a schematic diagram of the voltage withstand test of the single-phase cable terminal connection device.

[0016] In the figure: 1. split-phase busbar, 2. retractable busbar, 3. angle busbar, 4. single-phase cable terminal connection device, 5. horizontal corrugated pipe, 6. vertical corrugated pipe, 7. single-phase cable terminal, 8. conductor, 9. contact, 10. insulator, 11. insulator shielding terminal, 12. cable shielding terminal. DETAILED DESCRIPTION

[0017] like Figure 1The GIS cable terminal phase connection device shown includes a phase bus 1, in which the three phases of the cable are divided into different directions, one phase is directly downward, and the other two phases are horizontally divided into the left and right sides respectively; the unit structures connected on the left and right sides of the phase bus 1 are the same, and the unit structures are sequentially a horizontal retractable bus 2, an angle bus 3, a vertical retractable bus 2, and a single-phase cable terminal connection device 4; the horizontal retractable bus 2 is provided with a horizontal corrugated pipe 5, and the vertical retractable bus 2 is provided with a vertical corrugated pipe 6; the middle of the phase bus 1 is connected downward with a single-phase cable terminal connection device 4. Through the above structure, each phase in the three-phase common box structure is connected to the corresponding single-phase cable terminal 7.

[0018] like Figure 2 As shown, the interior of the horizontal retractable busbar 2 is provided with a contact 9, and the depth of the internal conductor 8 inserted into the contact 9 is adjusted by compressing or releasing the horizontal corrugated tube 5, thereby adjusting the width of the horizontal extension of the unit structure on the left and right sides to match the single-phase cable terminals 7 with different phase spacings and reduce the horizontal installation error of the equipment. The interior of the vertical retractable busbar 2 is provided with a contact 9, and the depth of the internal conductor 8 inserted into the contact 9 is adjusted by compressing or releasing the vertical corrugated tube 6, thereby changing the vertical height of the angle busbar 3 to match the single-phase cable terminals 7 with different heights and reduce the vertical installation error of the equipment.

[0019] like Figure 3-4 As shown, the upper end of the single-phase cable terminal connection device 4 is a shielding terminal 11 with an insulator 10, and the conductor 8 passes through the shielding terminal 11 of the insulator 10 and is connected to the single-phase cable terminal 7 inserted into the single-phase cable terminal connection device 4. The conductor 8 in the single-phase cable terminal connection device 4 is a detachable structure, one end of the conductor 8 passes through the single-phase cable terminal connection device 4 and is connected to the upper conductor part, and the other end is inserted into the single-phase cable terminal 7 and is connected to the cable inside the single-phase cable terminal 7. Preferably, the end of the single-phase cable terminal 7 inserted into the single-phase cable terminal connection device 4 is provided with a cable shielding terminal 12.

[0020] Figure 4 It is a schematic diagram of the withstand voltage test of the single-phase cable terminal connection device. When the GIS equipment is subjected to a withstand voltage test, the conductor in the single-phase cable terminal connection device 4 can be removed, and only the insulator shielding terminal 11 and the cable shielding terminal 12 are retained to form an isolation fracture, thereby meeting the insulation requirements of the withstand voltage test.

Claims

1. A GIS cable terminal phase connection device, characterized in that: The invention comprises a phase-splitting busbar (1), wherein three phases of cables are divided into different directions inside the phase-splitting busbar (1), wherein one phase is directed downwards, and the other two phases are respectively divided horizontally into left and right sides; the unit structures connected to the left and right sides of the phase-splitting busbar (1) are the same, and the unit structures are sequentially a horizontal retractable busbar (2), an angled busbar (3), a vertical retractable busbar (2), and a single-phase cable terminal connection device (4); the horizontal retractable busbar (2) is provided with a horizontal corrugated pipe (5), and the vertical retractable busbar (2) is provided with a vertical corrugated pipe (6); and the middle of the phase-splitting busbar (1) is connected downwards with a single-phase cable terminal connection device (4).

2. A GIS cable terminal phase connection device according to claim 1, characterized in that: The transverse retractable busbar (2) is provided with a contact (9) inside. By compressing or releasing the horizontal bellows (5), the depth of the internal conductor (8) inserted into the contact (9) is adjusted, thereby adjusting the width of the transverse extension of the unit structures on the left and right sides.

3. A GIS cable terminal phase connection device according to claim 1, characterized in that: The vertical retractable busbar (2) is provided with a contact (9) inside. By compressing or releasing the vertical bellows (6), the depth of the internal conductor (8) inserted into the contact (9) is adjusted, thereby adjusting the vertical extension height of the left and right side unit structures.

4. A GIS cable terminal phase connection device according to claim 1, characterized in that: The upper end of the single-phase cable terminal connection device (4) is a shielding terminal (11) with an insulator (10), and the conductor (8) passes through the shielding terminal (11) of the insulator (10) and is connected to the single-phase cable terminal (7) inserted into the single-phase cable terminal connection device (4).

5. A GIS cable terminal phase connection device according to claim 1, characterized in that: The conductor (8) in the single-phase cable terminal connection device (4) is a detachable structure. One end of the conductor (8) passes through the single-phase cable terminal connection device (4) and is connected to the upper conductor part, and the other end is inserted into the single-phase cable terminal (7) and is connected to the cable inside the single-phase cable terminal (7).

6. A GIS cable terminal phase-separated connection device according to claim 1, characterized in that: The end of the single-phase cable terminal (7) inserted into the single-phase cable terminal connection device (4) is provided with a cable shielding terminal (12).

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