Ring main unit power frequency withstand voltage test connecting device

Abstract

The utility model relates to the technical field of power equipment, in particular to a ring main unit power frequency withstand voltage test connecting device which comprises a connecting bus, one end of the connecting bus is tapped, the connecting bus is sleeved with a stainless steel pipe, the two ends of the connecting bus extend out of the two ends of the stainless steel pipe, and the stainless steel pipe is wrapped with an insulating protection layer. The extension part of the connection bus is wrapped by the insulation protection layer to be isolated from the outside, and the test clamping part is extended by the connection bus to be separated and isolated from the cabinet body, so that the damage of power supply equipment and the like caused by discharge due to insufficient safety distance is avoided, and the operation safety of the equipment is ensured; and meanwhile, the problem that personnel are injured due to discharge is also avoided, and more complete installation guarantee is provided for the test process.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and particularly to a connection device for power frequency withstand voltage test of a ring main unit. Background Art

[0002] A ring main unit (RMU) refers to a ring-shaped distribution network, that is, the power supply main line forms a closed ring. The power supply feeds power to this ring main line, and then distributes power outward through high-voltage switches one by one from the main line. It is a set of power transmission and distribution electrical equipment (high-voltage switchgear) installed in a metal or non-metal insulated cabinet or made into a prefabricated sectionalized ring main unit electrical equipment, and its core part adopts a load switch and a fuse. The so-called "ring main unit" means that each distribution branch is equipped with a switch cabinet (outgoing switch cabinet), which is an important equipment in the power system, and its safe and stable operation is of great significance for ensuring power supply.

[0003] During the production, installation and use of the ring main unit, the power frequency withstand voltage test is an essential link. However, the ring main unit has the advantages of small volume and compact structure. While having a small volume, it also poses a problem for the power frequency withstand voltage test of the product. Currently, the cabinet width of the standardized ring main unit - environmentally friendly gas cabinet is 420 mm, and the distance between the bushings is 110 mm. In this case, when using the traditional connection device for the power frequency withstand voltage test, there may be a phenomenon of insecure connection or inconvenient connection, which is very likely to cause phase-to-phase or phase-to-ground discharge, posing a great safety hazard to the product and the experimental equipment.

[0004] With the development of the power industry, more and more ring main units are needed in the power system because of their small volume but powerful functions. In order to ensure the safe operation of the power system, the quality of the product needs to be good enough, so the test of each product cannot be omitted. The power frequency withstand voltage test of the product is a particularly important test, but the data measured by the traditional test method may not be accurate and safe enough.

[0005] Therefore, the present application provides a connection device for power frequency withstand voltage test of a ring main unit, which is used to improve the connection efficiency and safety of the ring main unit in the power frequency withstand voltage test. Utility Model Content

[0006] The purpose of the present application is to solve the problems existing in the prior art, and to propose a connection device for power frequency withstand voltage test of a ring main unit.

[0007] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0008] A connection device for power frequency withstand voltage test of a ring main unit includes a connection busbar. One end of the connection busbar is tapped. A stainless steel pipe is sleeved outside the connection busbar. Both ends of the connection busbar extend out from both ends of the stainless steel pipe. The stainless steel pipe is coated with an insulating protective layer.

[0009] Preferably, a skirt-shaped insulating sleeve I is sleeved on one end of the connecting busbar where tapping is performed, and the insulating protective layer is located thereon.

[0010] Preferably, a plurality of skirt-shaped insulating sleeves II are provided on the outer wall of the insulating protective layer.

[0011] Preferably, the connecting busbar is a copper rod with a length of 700 mm and a diameter of 16 mm, and one end of the copper rod is tapped for 30 mm.

[0012] Preferably, the stainless steel pipe has an outer diameter of 18 mm, a wall thickness of 1 mm, and a length of 600 mm.

[0013] Preferably, a screw sleeve is threadedly installed at one end of the stainless steel pipe that is away from the tapping end of the connecting busbar. Two arc-shaped plates are fixedly spaced on the side wall of the screw sleeve, and a plurality of insulating rings are fixedly spaced together between the inner walls of the two arc-shaped plates.

[0014] Preferably, the horizontal projection widths of the two arc-shaped plates are different, and the horizontal projection width of one of the arc-shaped plates is smaller than the diameter of the connecting busbar.

[0015] Preferably, an insulating cover is sleeved outside the two arc-shaped plates.

[0016] Compared with the prior art, the present application provides a connection device for the power frequency withstand voltage test of a ring main unit, having the following beneficial effects:

[0017] 1. The extended part of the connecting busbar is wrapped by the insulating protective layer to be isolated from the outside world, and the test clamping part is extended through the connecting busbar to be separated and isolated from the cabinet body, thereby avoiding damage to power supply equipment and the like caused by discharge due to insufficient safety distance, ensuring the safety of equipment operation; at the same time, it also avoids the problem of personnel being injured due to discharge, providing a safer guarantee for the test process.

[0018] 2. The connecting busbar is threadedly connected to the cable support column in the cable chamber of the ring main unit, and installation can be completed by screwing, which speeds up the installation speed, solves the problem that it was inconvenient to wire the cable support column during previous tests, and improves work efficiency.

[0019] Other advantages, objectives, and features of the present application will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, they will be obvious to those skilled in the art; or, they can be learned from the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the test connection device of the present application.

[0021] Figure 2Explosion schematic diagram of a further improved structure of the test connection device of the present application.

[0022] Figure 3 For the present application Figure 2 Cross-sectional view.

[0023] Figure 4 For the present application Figure 3 Partial schematic view at position A.

[0024] Figure 5 For the present application Figure 3 Partial schematic view at position B.

[0025] Figure 6 For the present application Figure 2 Schematic diagram of the screw sleeve and its assembly thereon in the present application.

[0026] In the figure: 1, skirt-shaped insulating sleeve I; 2, connecting busbar; 3, stainless steel pipe; 4, insulating protective layer; 5, skirt-shaped insulating sleeve II; 6, screw sleeve; 7, arc-shaped plate; 8, insulating ring; 9, insulating cover. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying Figure 1-6 , and it is obvious that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0028] To solve the problems existing in the prior art, this embodiment provides a ring main unit power frequency withstand voltage test connection device, including a connecting busbar 2, one end of the connecting busbar 2 is tapped, a stainless steel pipe 3 is sleeved outside the connecting busbar 2, both ends of the connecting busbar 2 extend out from both ends of the stainless steel pipe 3, and an insulating protective layer 4 is wrapped outside the stainless steel pipe 3.

[0029] Principle details of this embodiment:

[0030] A ring main unit power frequency withstand voltage test connection device includes, from the inside out, a connecting busbar 2, a stainless steel pipe 3, and an insulating protective layer 4. The connecting busbar 2 has good electrical conductivity. One end of the connecting busbar 2 is a connecting end and the other end is a test clamping end. The connecting end of the connecting busbar 2 is tapped and directly screwed and connected to the cable support column in the cable chamber of the ring main unit through a thread. The installation is carried out by screwing through a thread, which is convenient and fast, and improves the installation efficiency.

[0031] During assembly, the stainless steel pipe 3 is rust-removed. The stainless steel pipe 3 has low conductivity. The insulating protective layer 4 is selected as a 40KV heat-shrinkable sleeve. The insulating protective layer 4 is sleeved on the stainless steel pipe 3 and tightly wrapped around the stainless steel pipe 3 by heat shrinkage without wrinkles and is completely fitted, so that the insulating protective layer 4 is closely combined with the stainless steel pipe 3. The connecting busbar 2 is inserted into the stainless steel pipe 3, and both ends of the connecting busbar 2 extend out of the stainless steel pipe 3. One end of the connecting busbar 2 with tapped threads is exposed and screwed into the cable support column in the cable compartment of the ring main unit, while the other end is exposed to reserve a test clamping space. The connecting wire for the withstand voltage test can be directly clamped on the connecting busbar 2 to start the test.

[0032] In this way, the outer extended part of the connecting busbar 2 is wrapped by the insulating protective layer 4 to be isolated from the outside world, and the test clamping part is extended through the connecting busbar 2 to be separated and isolated from the cabinet body, thus avoiding the damage of power supply equipment and the like caused by discharge due to insufficient safety distance, ensuring the safety of equipment operation, and at the same time avoiding the problem of personnel being injured due to discharge, providing a more secure guarantee for the test process. And the connecting busbar 2 is threadedly connected to the cable support column in the cable compartment of the ring main unit, solving the problem that it was inconvenient to connect wires to the cable support column during previous tests, accelerating the installation speed and improving the work efficiency.

[0033] In a further embodiment of this solution, a skirt-shaped insulating sleeve 1 is sleeved at one end of the connecting busbar 2 with tapped threads on the insulating protective layer 4, and through heat shrinkage, the skirt-shaped insulating sleeve 1 is fitted with the insulating protective layer 4. The connection part between the tapped end of the connecting busbar 2 and the cable support column is covered by the skirt-shaped insulating sleeve 1 to be isolated, avoiding accidental discharge at the connection and installation part and further improving the equipment safety.

[0034] Preferably, during installation, some lubricating grease is applied to the inner side of the skirt-shaped insulating sleeve 1 to facilitate the insertion of the cable support column into the skirt-shaped insulating sleeve 1.

[0035] In a further embodiment of this solution, a plurality of skirt-shaped insulating sleeves 5 are provided on the outer wall of the insulating protective layer 4. Through the skirt-shaped insulating sleeves 5, the occurrence of creepage at the extended end of the connecting device during the test is avoided, and the safety of equipment use is further improved.

[0036] In a further embodiment of this solution, in this embodiment, a model of the connecting busbar 2 that can form a sufficient safety distance is provided: The connecting busbar 2 is a copper rod with a length of 700mm and a diameter of 16mm, and one end of the copper rod is tapped for 30mm.

[0037] In a further embodiment of this solution, a stainless steel pipe 3 model that matches the length of the connecting busbar 2 and is sufficient to expose both ends of the connecting busbar 2 is provided: the outer diameter of the stainless steel pipe 3 is 18 mm, the wall thickness is 1 mm, and the length is 600 mm. One end of the connecting busbar 2 is tapped with a 16 mm thread, and the thread length is 30 mm. In this way, when installing, there is sufficient overhanging dimension at both ends of the connecting busbar 2.

[0038] In a further embodiment of this solution, since the test clamping end of the connecting busbar 2 extends out of the stainless steel pipe 3 and is not covered by the insulating protective layer 4, there is a risk of electric leakage and current leakage. To reduce the risk, in this embodiment, a bushing 6 is threadedly installed on the stainless steel pipe 3 at the end away from the tapped end of the connecting busbar 2. Two arc-shaped plates 7 are fixedly spaced on the side wall of the bushing 6, and a plurality of insulating rings 8 are fixedly spaced together between the inner walls of the two arc-shaped plates 7.

[0039] Details of the principle of this embodiment:

[0040] The stainless steel pipe 3 is provided with an external thread at the end away from the test clamping end of the connecting busbar 2, and a bushing 6 is threadedly installed on the external thread. There is a notch at the end of the insulating protective layer 4 for the bushing 6 to extend into. Two extension plates are fixedly spaced on the side wall of the bushing 6, and arc-shaped plates 7 are fixed at the ends of the two extension plates. The arc-shaped plates 7 are made of weakly conductive or insulating materials. A plurality of insulating rings 8 are fixedly spaced together between the inner walls of the two arc-shaped plates 7. The gap between adjacent insulating rings 8 is the clamping part. Through the insulating rings 8, the exposed area of the connecting busbar 2 is reduced as much as possible, and the risk of current leakage is reduced; and through the obstruction of the outer contour of the insulating rings 8, the probability of accidental contact by workers is reduced, thereby reducing the use risk.

[0041] In a further embodiment of this solution, the horizontal projection widths of the two arc-shaped plates 7 are different, and the horizontal projection width of one of the arc-shaped plates 7 is less than the diameter of the connecting busbar 2. In this way, the obstruction of the arc-shaped plate 7 to the test clamping piece of the connecting busbar 2 is reduced as much as possible.

[0042] In a further embodiment of this solution, an insulating cover 9 is sleeved outside the two arc-shaped plates 7. The insulating cover 9 is made of insulating material, such as rubber. A friction layer is made on the inner wall of the insulating cover 9 and the outer wall of the arc-shaped plate 7. A plum blossom grip is provided at the outer end of the insulating cover 9. By buckling the insulating cover 9 on the two arc-shaped plates 7, the test clamping end of the connecting busbar 2 is closed; when in use, several insulating rings 8 need to be exposed, and the insulating cover 9 can be pulled out by holding the plum blossom grip to expose the clamping point. The outer leakage area of the connecting busbar 2 is further reduced, and at the same time, the arc-shaped plates 7 are protected, improving the use safety.

[0043] Preferably, the ends of the two arc-shaped plates 7 are jointly connected with a cone head, which not only improves the relative position stability of the ends of the two arc-shaped plates 7 in suspension, but also facilitates the embedding of the insulating cover 9.

[0044] As described above, the above are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and application concept of the present application, makes equivalent substitutions or changes, and should be covered by the protection scope of the present application.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A power frequency withstand voltage test connection device for a ring main unit, characterized in that, The invention comprises a connecting busbar (2), one end of the connecting busbar (2) is tapped, a stainless steel tube (3) is provided on the outer jacket of the connecting busbar (2), two ends of the connecting busbar (2) extend from two ends of the stainless steel tube (3), and the stainless steel tube (3) is coated with an insulating protective layer (4).

2. The connection device for the power frequency withstand voltage test of the ring main unit according to claim 1, characterized in that, The insulating protective layer (4) is located at one end of the tapped end of the connecting busbar (2) and is provided with a skirt-shaped insulating sleeve (1).

3. The power frequency withstand voltage test connection device for a ring main unit according to claim 1, characterized in that, A plurality of skirt-shaped insulating sleeves 2 (5) are provided on the outer wall of the insulating protective layer (4).

4. A connection device for power frequency withstand voltage test of a ring main unit according to claim 1, characterized in that, The connecting busbar (2) is a copper rod with a length of 700 mm and a diameter of 16 mm, and one end of the copper rod is tapped for 30 mm.

5. The connection device for the power frequency withstand voltage test of a ring main unit according to claim 4, wherein, The stainless steel tube (3) has an outer diameter of 18 mm, a wall thickness of 1 mm, and a length of 600 mm.

6. The power frequency withstand voltage test connection device for a ring main unit according to claim 1, wherein The stainless steel pipe (3) is threadedly mounted with a screw sleeve (6) at one end of the threaded end facing away from the connecting busbar (2), two arc-shaped plates (7) are fixed at intervals on the side wall of the screw sleeve (6), and a plurality of insulating rings (8) are fixed at intervals between the inner walls of the two arc-shaped plates (7).

7. A connection device for power frequency withstand voltage test of a ring main unit according to claim 6, characterized in that, The horizontal projection widths of the two arc-shaped plates (7) are different, and the horizontal projection width of one of the arc-shaped plates (7) is smaller than the diameter of the connecting busbar (2).

8. The connection device for power frequency withstand voltage test of a ring main unit according to claim 6, characterized in that, An insulating cover (9) is commonly provided outside the two arc-shaped plates (7).

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