CN113433440A - A keep apart auxiliary device for high tension cable withstand voltage test - Google Patents
A keep apart auxiliary device for high tension cable withstand voltage test Download PDFInfo
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- CN113433440A CN113433440A CN202110823368.8A CN202110823368A CN113433440A CN 113433440 A CN113433440 A CN 113433440A CN 202110823368 A CN202110823368 A CN 202110823368A CN 113433440 A CN113433440 A CN 113433440A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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Abstract
The invention discloses an isolation auxiliary device for a high-voltage cable voltage-withstanding test, wherein when the cable is subjected to the voltage-withstanding test, a boosting device is connected with the cable through the isolation auxiliary device through the cable, and the isolation auxiliary device comprises a fixing component for connecting the voltage-withstanding cable and a connecting cable, a shielding isolation component wrapped outside the fixing component and a grounding wire connected to the shielding isolation component. The invention comprises charging with SF6The gas capsule enhances the insulating strength; the invention comprises a grounded shielding layer, an electromagnetic field generated by high voltage is shielded in the shielding layer, and meanwhile, if a cable head in the shielding layer discharges, leaked current can flow into a ground net along the shielding layer, so that equipment outside the shielding layer cannot be damaged, and the effect of safety protection is achieved.
Description
Technical Field
The invention relates to an isolation auxiliary device for a high-voltage cable voltage withstand test, and belongs to the technical field of high-voltage cable voltage withstand.
Background
The power cable is used for transmitting and distributing electric energy and is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and transmission lines under river-crossing seawater.
Generally included by category are oil impregnated paper insulated power cables, plastic insulated power cables, rubber insulated power cables.
The cables can be damaged by external force during the processes of storage, transportation, laying and operation, and particularly, the operated direct-buried cables are easy to be damaged in ground construction of other projects. The cable is soaked by the outdoor terminal head due to the fact that the construction is poor and the insulating glue is not filled, and the terminal head is soaked and finally explodes.
Weak links of a cable line are a terminal and an intermediate joint, and faults such as insulation breakdown of the cable to the ground in operation occur. The insulation and voltage resistance test is the most direct method for checking the cable dielectric strength, has decisive significance for judging whether the power cable is put into operation or not, and is an important means for ensuring the cable insulation level and avoiding insulation accidents. Therefore, before the newly-built power cable is put into operation, an alternating current withstand voltage test needs to be carried out according to the requirements of the electrical equipment handover test standard of electrical equipment installation engineering. The voltage withstand test is carried out by the national grid company 'transformation detection management regulation' when the main insulation strength needs to be checked because the power cable is suspected to have defects.
The existing power cable pressure test has the problems that: high voltage far exceeding operation voltage is required to be applied to a cable head in the voltage-withstanding process of the power cable, and in the test process, due to the fact that the insulation distance is insufficient, leakage current can damage nearby equipment, and the leakage current is too large to cause that testers are in danger of electric shock.
Disclosure of Invention
The invention aims to provide an isolation auxiliary device for a high-voltage cable voltage-withstanding test, which effectively solves the problem of insufficient insulation distance in the voltage-withstanding process of a cable. By charging with SF6The gas capsule strengthens insulation, and the leakage current is shielded by the cage-shaped shielding net, so that the safety of the current withstand voltage test is improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides an keep apart auxiliary device for high tension cable withstand voltage test, is including the fixed subassembly that is used for connecting withstand voltage cable and connecting cable, the shielding isolation subassembly of parcel outside the fixed subassembly and the earth connection of connection on the shielding isolation subassembly.
As a further improvement of the present invention,
the fixing assembly comprises two fixing plates which are oppositely arranged, cable pressing plates which are fixedly connected to the opposite surfaces of the two fixing plates through supporting and fixing springs respectively, and pressing bolts which penetrate through the fixing plates and are used for tightly pressing the cable pressing plates;
the end part of the pressure-resistant cable is stripped of the external insulating layer to expose the second cable wiring board, and the end part of the connecting cable is stripped of the external insulating layer to expose the first cable wiring board;
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable wiring board and the second cable wiring board are respectively compressed by two opposite cable compression plates.
As a further improvement of the present invention,
the cable pressing plate is a copper plate.
As a further improvement of the present invention,
and an extension spring positioned between the pressure-resistant cable and the connecting cable is connected between the two cable pressing plates.
As a further improvement of the present invention,
the number of the extension springs is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate.
As a further improvement of the present invention,
the shielding and isolating component comprises an elastic capsule sleeved outside the fixing plate and a cage-shaped shielding net sleeved outside the elastic capsule.
As a further improvement of the present invention,
the interior of the elastic capsule forms SF6And (5) an inflating bin.
As a further improvement of the present invention,
the elastic capsule is made of elastic insulating plastic materials, and the elastic capsule is provided with a material for supplying SF6The inflation chamber is filled with SF6And a gas charging port.
As a further improvement of the present invention,
the cage-shaped shielding net is made of conductive metal, and the grounding wire is connected to the cage-shaped shielding net.
As a further improvement of the present invention,
the outer shielding layers of the voltage-resistant cable and the connecting cable are grounded.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention comprises a grounded shielding layer, an electromagnetic field generated by high voltage is shielded in the shielding layer, and meanwhile, if a cable head in the shielding layer discharges, leaked current can flow into a ground net along the shielding layer, so that equipment outside the shielding layer cannot be damaged, and the effect of safety protection is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
Wherein:
the device comprises a connecting cable 1, a pressure-resistant cable 2, an elastic capsule 3, an inflation cabin 4 SF6, an inflation inlet 5, a cage-shaped shielding net 6, a first cable wiring board 7, a second cable wiring board 8, a fixing board 9, a compression bolt 10, a cable compression plate 11, a supporting and fixing spring 12, a tension spring 13 and a grounding wire 14.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.
Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Example one
As shown in figure 1 of the drawings, in which,
an isolation auxiliary device for a high-voltage cable withstand voltage test comprises a fixing assembly for connecting a withstand voltage cable 2 and a connecting cable 1, a shielding isolation assembly wrapped outside the fixing assembly and a grounding wire 14 connected to the shielding isolation assembly.
In a specific aspect of the present embodiment,
the fixing assembly comprises two fixing plates 9 which are oppositely arranged, cable pressing plates 11 which are fixedly connected to opposite surfaces of the two fixing plates 9 through supporting and fixing springs 12 respectively, and pressing bolts 10 which penetrate through the fixing plates 9 and are used for tightly pressing the cable pressing plates 11;
the end of the pressure-resistant cable 2 is stripped of the external insulating layer to expose the second cable wiring board 8, and the end of the connecting cable 1 is stripped of the external insulating layer to expose the first cable wiring board 7;
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable terminal block 7 and the second cable terminal block 8 are respectively pressed by two opposite cable pressing plates 11.
In a specific aspect of the present embodiment,
the cable pressing plate 11 is a copper plate.
In a specific aspect of the present embodiment,
the shielding and isolating assembly comprises a flexible bladder 3 that is sleeved outside a fixed plate 9.
In a specific aspect of the present embodiment,
the inside of the elastic capsule 3 is formed with SF6And an inflating chamber 4.
Placing a first cable terminal plate 7 to which a cable 1 is connected and a second cable terminal plate 8 to which a pressure-resistant cable 2 is connected at both ends between cable pressing plates 11, respectively, and loosening the cable pressing plates 11; then, by screwing down the compression bolt 10, the lower end of the compression bolt 10 generates pressure on the cable compression plate 11, so that the cable compression plate 11 is ensured to stably clamp the first cable wiring board 7 and the second cable wiring board 8, and looseness is avoided; is filled with SF6The elastic capsule 3 of the gas forms a shielding layer for the withstand voltage test of the withstand voltage cable 2, and shields an electromagnetic field generated by high voltage in the shielding layer, thereby playing a role of safety protection.
Example two
As shown in figure 1 of the drawings, in which,
an isolation auxiliary device for a high-voltage cable withstand voltage test comprises a fixing assembly for connecting a withstand voltage cable 2 and a connecting cable 1, a shielding isolation assembly wrapped outside the fixing assembly and a grounding wire 14 connected to the shielding isolation assembly.
In a specific aspect of the present embodiment,
the fixing assembly comprises two fixing plates 9 which are oppositely arranged, cable pressing plates 11 which are fixedly connected to opposite surfaces of the two fixing plates 9 through supporting and fixing springs 12 respectively, and pressing bolts 10 which penetrate through the fixing plates 9 and are used for tightly pressing the cable pressing plates 11;
the end of the pressure-resistant cable 2 is stripped of the external insulating layer to expose the second cable wiring board 8, and the end of the connecting cable 1 is stripped of the external insulating layer to expose the first cable wiring board 7;
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable terminal block 7 and the second cable terminal block 8 are respectively pressed by two opposite cable pressing plates 11.
In a specific aspect of the present embodiment,
the cable pressing plate 11 is a copper plate.
In a specific aspect of the present embodiment,
an extension spring 13 positioned between the pressure-resistant cable 2 and the connecting cable 1 is connected between the two cable pressing plates 11.
In a specific aspect of the present embodiment,
the number of the extension springs 13 is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate 11.
In a specific aspect of the present embodiment,
the shielding and isolating assembly comprises a flexible bladder 3 that is sleeved outside a fixed plate 9.
In a specific aspect of the present embodiment,
the inside of the elastic capsule 3 is formed with SF6And an inflating chamber 4.
In a specific aspect of the present embodiment,
the elastic capsule 3 is made of elastic insulating plastic materials.
Pulling the two cable pressing plates 11 to separate, respectively placing the first cable wiring board 7 of the connecting cable 1 and the second cable wiring board 8 of the pressure-resistant cable 2 to the cable pressingAt both ends between the plates 11, the cable pressing plates 11 are loosened, and due to the elastic restoring force of the extension springs 13, the two cable pressing plates 11 are clamped at the outer side parts of the first cable wiring board 7 and the second cable wiring board 8; then, by screwing down the compression bolt 10, the lower end of the compression bolt 10 generates pressure on the cable compression plate 11, so that the cable compression plate 11 is ensured to stably clamp the first cable wiring board 7 and the second cable wiring board 8, and looseness is avoided; is filled with SF6The elastic capsule 3 of the gas forms a shielding layer for the withstand voltage test of the withstand voltage cable 2, and shields an electromagnetic field generated by high voltage in the shielding layer, thereby playing a role of safety protection.
EXAMPLE III
As shown in figure 1 of the drawings, in which,
an isolation auxiliary device for a high-voltage cable withstand voltage test comprises a fixing assembly for connecting a withstand voltage cable 2 and a connecting cable 1, a shielding isolation assembly wrapped outside the fixing assembly and a grounding wire 14 connected to the shielding isolation assembly.
In a specific aspect of the present embodiment,
the fixing assembly comprises two fixing plates 9 which are oppositely arranged, cable pressing plates 11 which are fixedly connected to opposite surfaces of the two fixing plates 9 through supporting and fixing springs 12 respectively, and pressing bolts 10 which penetrate through the fixing plates 9 and are used for tightly pressing the cable pressing plates 11;
the end of the pressure-resistant cable 2 is stripped of the external insulating layer to expose the second cable wiring board 8, and the end of the connecting cable 1 is stripped of the external insulating layer to expose the first cable wiring board 7;
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable terminal block 7 and the second cable terminal block 8 are respectively pressed by two opposite cable pressing plates 11.
In a specific aspect of the present embodiment,
the cable pressing plate 11 is a copper plate.
In a specific aspect of the present embodiment,
an extension spring 13 positioned between the pressure-resistant cable 2 and the connecting cable 1 is connected between the two cable pressing plates 11.
In a specific aspect of the present embodiment,
the number of the extension springs 13 is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate 11.
In a specific aspect of the present embodiment,
the shielding and isolating assembly comprises a flexible bladder 3 that is sleeved outside a fixed plate 9.
In a specific aspect of the present embodiment,
the inside of the elastic capsule 3 is formed with SF6And an inflating chamber 4.
In a specific aspect of the present embodiment,
the elastic capsule 3 is made of elastic insulating plastic materials, and the elastic capsule 3 is provided with a material for supplying SF6The inflation chamber 4 is filled with SF6And a gas charging port.
Pulling the two cable pressing plates 11 to separate, respectively placing the first cable wiring board 7 for connecting the cable 1 and the second cable wiring board 8 for connecting the pressure-resistant cable 2 at two ends between the cable pressing plates 11, loosening the cable pressing plates 11, and clamping the two cable pressing plates 11 at the outer side parts of the first cable wiring board 7 and the second cable wiring board 8 due to the elastic restoring force of the tension spring 13; then, by screwing down the compression bolt 10, the lower end of the compression bolt 10 generates pressure on the cable compression plate 11, so that the cable compression plate 11 is ensured to stably clamp the first cable wiring board 7 and the second cable wiring board 8, and looseness is avoided; the SF inside the elastic capsule 3 is treated by the inflation inlet 56Safety gas SF with sufficient insulation for inflating chamber 46Then the inflation inlet 5 is sealed and plugged; is filled with SF6The elastic capsule 3 of the gas forms a shielding layer for the withstand voltage test of the withstand voltage cable 2, and shields an electromagnetic field generated by high voltage in the shielding layer, thereby playing a role of safety protection.
Example four
As shown in figure 1 of the drawings, in which,
an isolation auxiliary device for a high-voltage cable withstand voltage test comprises a fixing assembly for connecting a withstand voltage cable 2 and a connecting cable 1, a shielding isolation assembly wrapped outside the fixing assembly and a grounding wire 14 connected to the shielding isolation assembly.
In a specific aspect of the present embodiment,
the fixing assembly comprises two fixing plates 9 which are oppositely arranged, cable pressing plates 11 which are fixedly connected to opposite surfaces of the two fixing plates 9 through supporting and fixing springs 12 respectively, and pressing bolts 10 which penetrate through the fixing plates 9 and are used for tightly pressing the cable pressing plates 11;
the end part of the voltage-resistant cable 2 is stripped of an insulated cable sheath to expose a second cable wiring board 8, and the end part of the connecting cable 1 is stripped of the insulated cable sheath to expose a first cable wiring board 7;
the first cable terminal block 7 and the second cable terminal block 8 are respectively pressed by two opposite cable pressing plates 11.
In a specific aspect of the present embodiment,
the cable pressing plate 11 is a copper plate.
In a specific aspect of the present embodiment,
an extension spring 13 positioned between the pressure-resistant cable 2 and the connecting cable 1 is connected between the two cable pressing plates 11.
In a specific aspect of the present embodiment,
the number of the extension springs 13 is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate 11.
In a specific aspect of the present embodiment,
the shielding and isolating assembly comprises an elastic capsule 3 sleeved outside a fixing plate 9 and a cage-shaped shielding net 6 sleeved outside the elastic capsule 3.
In a specific aspect of the present embodiment,
the inside of the elastic capsule 3 is formed with SF6And an inflating chamber 4.
In a specific aspect of the present embodiment,
the elastic capsule 3 is made of elastic insulating plastic materials, and the elastic capsule 3 is provided with a material for supplying SF6The inflation chamber 4 is filled with SF6And a gas charging port.
In a specific aspect of the present embodiment,
the cage-shaped shielding net 6 is made of conductive metal, and the grounding wire 14 is connected to the cage-shaped shielding net 6.
The application process of this embodiment is as follows:
pulling the two cable pressing plates 11 to separate, and connecting the first cable of the connecting cable 1The plate 7 and the second cable connection plate 8 of the pressure-resistant cable 2 are respectively placed at two ends between the cable pressing plates 11, the cable pressing plates 11 are loosened, and the two cable pressing plates 11 are clamped at the outer side parts of the first cable connection plate 7 and the second cable connection plate 8 due to the elastic restoring force of the extension spring 13; then, by screwing down the compression bolt 10, the lower end of the compression bolt 10 generates pressure on the cable compression plate 11, so that the cable compression plate 11 is ensured to stably clamp the first cable wiring board 7 and the second cable wiring board 8, and looseness is avoided; the SF inside the elastic capsule 3 is treated by the inflation inlet 56Safety gas SF with sufficient insulation for inflating chamber 46Then the inflation inlet 5 is sealed and plugged; and grounding the grounding wire 14 connected to the cage-shaped shielding net 6; is filled with SF6The elastic capsule 3 of gas forms the shielding layer of withstand voltage test of withstand voltage cable 2, shields the electromagnetic field that high pressure produced inside the shielding layer, if the inside cable head of shielding layer takes place to discharge, the electric current that leaks out can flow into the earth mat along the shielding layer, can not damage the equipment outside the shielding layer, plays the effect of safety protection.
EXAMPLE five
As shown in figure 1 of the drawings, in which,
an isolation auxiliary device for a high-voltage cable withstand voltage test comprises a fixing assembly for connecting a withstand voltage cable 2 and a connecting cable 1, a shielding isolation assembly wrapped outside the fixing assembly and a grounding wire 14 connected to the shielding isolation assembly.
In a specific aspect of the present embodiment,
the fixing assembly comprises two fixing plates 9 which are oppositely arranged, cable pressing plates 11 which are fixedly connected to opposite surfaces of the two fixing plates 9 through supporting and fixing springs 12 respectively, and pressing bolts 10 which penetrate through the fixing plates 9 and are used for tightly pressing the cable pressing plates 11;
the end of the pressure-resistant cable 2 is stripped of the external insulating layer to expose the second cable wiring board 8, and the end of the connecting cable 1 is stripped of the external insulating layer to expose the first cable wiring board 7;
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable terminal block 7 and the second cable terminal block 8 are respectively pressed by two opposite cable pressing plates 11.
In a specific aspect of the present embodiment,
the cable pressing plate 11 is a copper plate.
In a specific aspect of the present embodiment,
an extension spring 13 positioned between the pressure-resistant cable 2 and the connecting cable 1 is connected between the two cable pressing plates 11.
In a specific aspect of the present embodiment,
the number of the extension springs 13 is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate 11.
In a specific aspect of the present embodiment,
the shielding and isolating assembly comprises an elastic capsule 3 sleeved outside a fixing plate 9 and a cage-shaped shielding net 6 sleeved outside the elastic capsule 3.
In a specific aspect of the present embodiment,
the inside of the elastic capsule 3 is formed with SF6And an inflating chamber 4.
In a specific aspect of the present embodiment,
the elastic capsule 3 is made of elastic insulating plastic materials, and the elastic capsule 3 is provided with a material for supplying SF6The inflation chamber 4 is filled with SF6And a gas charging port.
In a specific aspect of the present embodiment,
the cage-shaped shielding net 6 is made of conductive metal, and the grounding wire 14 is connected to the cage-shaped shielding net 6.
In a specific aspect of the present embodiment,
the outer shielding layers of the voltage-resistant cable 2 and the connecting cable 1 are grounded.
The application process of this embodiment is as follows:
pulling the two cable pressing plates 11 to separate, respectively placing the first cable wiring board 7 for connecting the cable 1 and the second cable wiring board 8 for connecting the pressure-resistant cable 2 at two ends between the cable pressing plates 11, loosening the cable pressing plates 11, and clamping the two cable pressing plates 11 at the outer side parts of the first cable wiring board 7 and the second cable wiring board 8 due to the elastic restoring force of the tension spring 13; then, by tightening the pressing bolt 10, the lower end of the pressing bolt 10 exerts pressure on the cable pressing plate 11, thereby securing the cableThe pressing plate 11 stably clamps the first cable wiring board 7 and the second cable wiring board 8 to avoid looseness; the SF inside the elastic capsule 3 is treated by the inflation inlet 56Safety gas SF with sufficient insulation for inflating chamber 46Then the inflation inlet 5 is sealed and plugged; grounding the grounding wire 14 connected to the cage-shaped shielding net 6, and simultaneously grounding the voltage-resistant cable 2 and the connecting cable 1 respectively; is filled with SF6The elastic capsule 3 of gas forms the shielding layer of withstand voltage test of withstand voltage cable 2, shields the electromagnetic field that high pressure produced inside the shielding layer, if the inside cable head of shielding layer takes place to discharge, the electric current that leaks out can flow into the earth mat along the shielding layer, can not damage the equipment outside the shielding layer, plays the effect of safety protection.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several aspects of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an keep apart auxiliary device for high tension cable withstand voltage test which characterized in that: the cable comprises a fixing assembly for connecting a voltage-resistant cable (2) and a connecting cable (1), a shielding and isolating assembly wrapped outside the fixing assembly and a grounding wire (14) connected to the shielding and isolating assembly.
2. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 1, wherein: the fixing assembly comprises two fixing plates (9) which are arranged oppositely, cable pressing plates (11) which are fixedly connected to the opposite surfaces of the two fixing plates (9) through supporting and fixing springs (12) respectively, and pressing bolts (10) which penetrate through the fixing plates (9) and are used for tightly pressing the cable pressing plates (11);
the end part of the pressure-resistant cable (2) is stripped of an external insulating layer to expose a second cable wiring board (8), and the end part of the connecting cable (1) is stripped of the external insulating layer to expose a first cable wiring board (7);
the outer insulating layer comprises an outer sheath, an armor, a shielding layer and a main insulator;
the first cable wiring board (7) and the second cable wiring board (8) are respectively compressed by two opposite cable compression plates (11).
3. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 2, wherein: the cable pressing plate (11) is a copper plate.
4. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 3, wherein: and an extension spring (13) positioned between the pressure-resistant cable (2) and the connecting cable (1) is connected between the two cable pressing plates (11).
5. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 4, wherein: the number of the extension springs (13) is two, and the extension springs are symmetrically and fixedly connected to two sides of the center line of the cable pressing plate (11).
6. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 3, wherein: the shielding and isolating component comprises an elastic capsule (3) sleeved outside the fixing plate (9) and a cage-shaped shielding net (6) sleeved outside the elastic capsule (3).
7. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 6, wherein: SF is formed inside the elastic capsule (3)6An inflation bin (4).
8. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 7, wherein: the elastic capsule (3) is made of elastic insulating plastic materials, and the elastic capsule (3) is provided with a material for supplying SF6The inflation bin (4) is filled with SF6And a gas charging port.
9. The isolation auxiliary device for the high-voltage cable withstand voltage test according to claim 8, wherein: the cage-shaped shielding net (6) is made of conductive metal, and the grounding wire (14) is connected to the cage-shaped shielding net (6).
10. An isolation auxiliary device for a high-voltage cable withstand voltage test according to any one of claims 1 to 9, wherein: and the outer shielding layers of the voltage-resistant cable (2) and the connecting cable (1) are grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110823368.8A CN113433440A (en) | 2021-07-21 | 2021-07-21 | A keep apart auxiliary device for high tension cable withstand voltage test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110823368.8A CN113433440A (en) | 2021-07-21 | 2021-07-21 | A keep apart auxiliary device for high tension cable withstand voltage test |
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