Miniaturized cable testing device for ring main unit

Abstract

The utility model discloses a miniature cable testing device for a ring main unit, which comprises a cable testing unit, the cable testing unit comprises a grounding cable testing end sleeve, a first branch bus, a second branch bus and a branch bus appearance sleeve, the grounding cable testing end sleeve is connected with a grounding contact through the first branch bus, and the branch bus appearance sleeve is connected with the grounding contact through the second branch bus. According to the utility model, the grounding cable test end sleeve is connected with the grounding contact of the existing isolation switch through the first branch bus, and the branch bus appearance sleeve is connected with the lower isolation grounding of the existing isolation switch through the second branch bus. The three phases of the grounding switch are led out through the independent grounding cable testing end sleeves of the first branch bus, the size of the cable testing device is reduced, the miniaturization requirement of the cable testing end is met, and meanwhile the size of the ring main unit with the cable testing end scheme can be further reduced according to the requirement in the installation layout remaining place.

Description

Technical Field

[0001] This utility model belongs to the field of ring main unit technology and relates to a miniaturized cable testing device for ring main units. Background Technology

[0002] Currently, the technical specifications of major countries in the Middle East and Southeast Asia markets have clear requirements for the "cable testing function" of ring main units, requiring that cable testing be completed without opening the cable compartment.

[0003] Existing cable testing units employ various testing methods, such as using three-phase integrated or ordinary outgoing sleeves. However, three-phase integrated sleeves have the problem of inconvenience in changing installation positions, while ordinary sleeves have the problem of being too large and occupying a large installation area. Summary of the Invention

[0004] In order to overcome at least one deficiency of the prior art, this utility model provides a miniaturized cable testing device for ring main units.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a miniaturized cable testing device for ring main units, comprising a cable testing unit, the cable testing unit comprising a grounding cable testing end sleeve, a first branch bus, a second branch bus, and a branch bus outgoing sleeve, the grounding cable testing end sleeve being connected to a grounding contact through the first branch bus, and the branch bus outgoing sleeve being connected to a lower isolation ground through the second branch bus.

[0006] Furthermore, the disconnecting switch of the ring main unit includes a bracket and an isolation grounding mechanism mounted on the bracket. The isolation grounding mechanism includes a grounding contact, a lower isolation grounding, a stationary contact of the disconnecting switch, a moving knife group, and a main shaft. The main shaft is linked with the three-station mechanism.

[0007] Furthermore, the support includes an insulating crossbeam and a fixed frame, with the grounding contact fixed to the fixed frame and the lower isolation grounding fixed to the insulating crossbeam.

[0008] Furthermore, the test end sleeve of the grounding cable is fixed to the first busbar, and the first busbar is connected to the grounding contact through the busbar.

[0009] Furthermore, the test end sleeve of the grounding cable is connected to an external test device.

[0010] Furthermore, the two ends of the second busbar are respectively fixedly connected to the busbar bushing and the insulating beam, and the second busbar located on the insulating beam is connected to the lower isolation ground.

[0011] Furthermore, the moving knife assembly includes an isolating knife switch and a transmission structure, with the isolating knife switch rotatably connected to the lower isolating ground.

[0012] Furthermore, when the disconnecting switch is in a grounded state, the grounding cable test end bushing, the first busbar, the grounding contact, the disconnecting knife switch, the lower disconnecting ground, the second busbar, and the bushing of the branch busbar form a connected conductive loop.

[0013] In summary, the advantages of this utility model are as follows:

[0014] This utility model uses a structure where the grounding cable test end bushing is connected to the grounding contact of an existing disconnector via a first busbar, and the branch busbar outgoing bushing is connected to the lower isolation grounding of the existing disconnector via a second busbar. This structure allows the three phases of the grounding switch to be led out through independent grounding cable test end bushings on the first busbar, reducing the size of the cable testing device and meeting the miniaturization requirements of the cable test end. At the same time, it leaves room for installation layout, and the size of the ring main unit with cable test end can be further reduced according to requirements. Attached Figure Description

[0015] Figure 1 This is an isometric drawing of the cable testing device and disconnecting switch assembly of this utility model.

[0016] Figure 2 for Figure 1 Another isometric view in another direction.

[0017] Figure 3 for Figure 1 The right view.

[0018] Figure 4 for Figure 1 The front view. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0022] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0023] Example 1:

[0024] like Figures 1-4 As shown, a miniaturized cable testing device for ring main units includes a cable testing unit. The cable testing unit includes a grounding cable test end sleeve 11, a first branch bus 12, a second branch bus 13, and a branch bus outgoing sleeve 14. The grounding cable test end sleeve 11 is connected to a grounding contact 21 through the first branch bus 12, and the branch bus outgoing sleeve 14 is connected to a lower isolation ground 22 through the second branch bus 13.

[0025] The disconnecting switch of the ring main unit includes a bracket 20 and an isolation grounding mechanism installed on the bracket 20. The isolation grounding mechanism includes a grounding contact 21, a lower isolation grounding 22, a stationary contact of the disconnecting switch (shown in the figure), a moving knife group 23, and a main shaft 24. The main shaft 24 is linked with a three-position mechanism. Driven by the three-position mechanism, the moving knife group 23 rotates at different angles, so that the moving knife group 23 is linked with the grounding contact 21 or the stationary contact of the disconnecting switch to realize the opening and closing and grounding actions.

[0026] The bracket 20 includes an insulating crossbeam 201, a fixing frame 202, and two sets of side plates 200. The two sets of side plates 200 are arranged in parallel, and the insulating crossbeam 201 and the fixing frame 202 are fixed between the two sets of side plates 200. The main shaft 24 is rotatably connected to the two sets of side plates 200.

[0027] The grounding contact 21 is fixed to the fixed frame 202, and the lower isolating ground 22 is fixed to the insulating crossbeam 201. The moving knife group 23 includes an isolating knife switch 231 and a transmission structure. The isolating knife switch 231 is rotatably connected to the lower isolating ground 22, and the connection point between the two is the rotation center of the isolating knife switch 231. The transmission structure is connected to the main shaft 24 and the isolating knife switch 231 respectively. The rotation of the main shaft 24 drives the transmission structure to rotate, and the rotation of the transmission structure drives the isolating knife switch 231 to rotate at different angles, so that the isolating knife switch 231 is linked with the grounding contact 21 or the stationary contact of the isolating switch to realize the opening and closing and grounding actions.

[0028] The side of the insulating beam 201 is provided with a reinforcing structure 2011, which enhances the bending and torsional resistance of the insulating beam 201. The reinforcing structure 2011 may be a honeycomb structure or / and a cross structure.

[0029] The disconnecting switch in this embodiment also includes other structures not mentioned. The disconnecting switch adopts a conventional structure and conventional principle, which will not be described in detail here.

[0030] The miniaturized cable testing device includes a three-phase cable testing unit. The three-phase cable testing units have similar structures, with only adaptive changes made in terms of size and dimensions.

[0031] like Figure 1 As shown, the grounding cable test end sleeve 11 is fixed to the first busbar 12. When testing the cable, the grounding cable test end sleeve 11 is connected to the external testing equipment. The first busbar 12 is connected to the grounding contact 21 through the busbar 15. The two ends of the second busbar 13 are fixedly connected to the busbar sleeve 14 and the insulating beam 201 respectively. The second busbar 13 located on the insulating beam 201 is connected to the lower isolation grounding 22.

[0032] This application adds a cable testing device without changing the design structure of the disconnecting switch. The grounding cable test end bushing 11 is connected to the grounding contact 21 through the first branch bus 12, and the branch bus out bushing 14 is connected to the lower isolation grounding 22 through the second branch bus 13. When the disconnecting switch is grounded, the grounding cable test end bushing 11, the first branch bus 12, the grounding contact 21, the disconnecting switch 231, the lower isolation grounding 22, the second branch bus 13, and the branch bus out bushing 14 form a continuous conductive loop. When testing the cable, the testing equipment is connected to the grounding cable test end bushing 11 to test the cable.

[0033] The grounding cable test end bushing 11 is a single-phase miniaturized bushing. In this application, the grounding cable test end bushing 11 is connected to the grounding contact 21 of the existing disconnecting switch through the first busbar 12, and the branch busbar bushing 14 is connected to the lower isolation grounding 22 of the existing disconnecting switch through the second busbar 13. The three phases of the grounding switch are led out through the independent grounding cable test end bushing 11 of the first busbar, which reduces the size of the cable testing device, meets the miniaturization requirements of the cable test end, and leaves room for installation layout. The size of the ring main unit with cable test end can be further reduced according to the requirements.

[0034] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A miniaturized cable testing device for ring main units, characterized in that: The cable testing unit comprises a grounding cable testing end sleeve, a first branch bus, a second branch bus and a branch bus emergence sleeve, the grounding cable testing end sleeve is connected with the grounding contact through the first branch bus, and the branch bus emergence sleeve is connected with the lower isolation grounding through the second branch bus.

2. The miniaturized cable testing device for ring main unit according to claim 1, characterized in that: The isolator of the ring main unit comprises a support and an isolation grounding mechanism mounted on the support, the isolation grounding mechanism comprises a grounding contact, a lower isolation grounding, an isolator static contact, a moving knife group and a main shaft, and the main shaft is linked with a three-position mechanism.

3. The miniaturized cable testing device for ring main unit according to claim 2, characterized in that: The support comprises an insulating cross beam and a fixing frame, the grounding contact is fixed on the fixing frame, and the lower isolation grounding is fixed on the insulating cross beam.

4. The miniaturized cable testing device for ring main unit according to claim 1, characterized in that: The grounding cable testing end sleeve is fixed on the first branch bus, and the first branch bus is connected with the grounding contact through the branch bus.

5. The miniaturized cable testing device for ring main unit according to claim 1, characterized in that: The grounding cable testing end sleeve is externally connected with a testing device.

6. The miniaturized cable testing device for ring main unit according to claim 3, characterized in that: The two ends of the second branch bus are respectively fixedly connected with the branch bus emergence sleeve and the insulating cross beam, and the second branch bus located on the insulating cross beam is connected with the lower isolation grounding.

7. The miniaturized cable testing device for ring main unit according to claim 2, characterized in that: The moving knife group comprises an isolation knife switch and a transmission structure, and the isolation knife switch is rotationally connected with the lower isolation grounding.

8. The miniaturized cable testing device for ring main units according to claim 7, characterized in that: The isolator is in a grounding state, and the grounding cable testing end sleeve, the first branch bus, the grounding contact, the isolation knife switch, the lower isolation grounding, the second branch bus and the branch bus emergence sleeve form a continuous conductive loop.

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