CN219247456U - GIL head and tail end and cable direct connection structure in underground pipe gallery - Google Patents

Abstract

The embodiment of the application provides a GIL head end and cable directly link structure in underground pipe gallery, electrically conductive subassembly, tee bend unit and GIL three-phase split phase unit set up in the underground pipe gallery, first feed inlet and second feed inlet set up in on the underground pipe gallery, electrically conductive subassembly is connected with the tee bend unit, and the tee bend unit is connected with the GIL three-phase split phase unit. According to the embodiment of the application, the GIL and the cable are installed in place at one time, the detachable conductor at the main loop end of the GIL in the terminal housing is removed under the condition that the cable terminal is not detached, an electrical isolation fracture is formed, meanwhile, the GIL voltage-resistant equipment is docked through the test interface reserved by the transition tee unit between the GIL and the cable terminal, the independent field voltage-resistant test of the GIL is finally realized, and the cross waiting period of the installation procedure of the GIL and the cable is effectively reduced.

Description

GIL head and tail end and cable direct connection structure in underground pipe gallery

Technical Field

The embodiment of the application belongs to the technical field of electric power, and particularly relates to a GIL head and tail end and cable direct connection structure in an underground pipe gallery, which is mainly used for realizing GIL field withstand voltage test under the condition of not disassembling a cable terminal when the GIL and the cable are directly connected in the underground pipe gallery.

Background

Currently, GIL is connected with a cable in a common manner with a jacketed terminal indirectly and a cable terminal directly.

The sleeve terminal indirect connection mode is mainly applied to outdoor scenes because the sleeve is required to be placed outdoors and then connected with a lead, and the outdoor environment is convenient for implementing the environmental characteristics of the field withstand voltage test, but the sleeve terminal indirect connection mode is mainly applied to outdoor scenes, an outdoor terminal platform is required to be built, and a certain area of land is required to be occupied, if the connection mode is arranged in an urban area, the cost is high, and the urban landscape and the environmental safety are not facilitated; the cable terminal direct connection mode is suitable for indoor and outdoor scenes, but belongs to the first application when the situation that the first end of the GIL in the underground pipe gallery is directly connected with the cable occurs in engineering application, and the space requirement of the GIL field withstand voltage test is also considered under the condition that the feasibility of the GIL and the cable connection arrangement space is fully considered.

1. The head and tail ends of the GIL are directly connected with the cable in the underground pipe gallery in engineering application.

When all with cable lug connection, adopt the vertical side direction in compact piping lane space to arrange, satisfy personnel's construction, maintenance, experimental space size, GIL branch export passes through cable terminal lug connection with the cable respectively, during the installation, installs in the high position through portable mounting platform, and mounting platform shifts out this feed inlet after the installation is accomplished, accomplishes electrical connection finally.

2. The head and tail ends of the GIL are all in current situation of a GIL field pressure-resistant scheme when the cable is directly connected and arranged in the underground pipe gallery.

For the GIL field withstand voltage test, since the voltage withstand standard is different between GIL and cable, the cable cannot perform the withstand voltage test according to the GIL standard, and therefore the GIL line needs to perform the field withstand voltage test alone.

Description 1: the GIL is divided into a three-phase split-box GIL and a three-phase common-box GIL, wherein each phase of the three-phase split-box GIL is independent in structure, and each phase of the three-phase split-box GIL is independent in pressure resistance test; the three-phase common box type GIL has electrical insulation relevance between phases because the three phases are in the same box shell, and the GIL insulation voltage test is qualified only after all the three phases pass the insulation voltage test.

Description 2: the technical scheme of withstand voltage when the three-phase common box type GIL is directly connected with the cable under the complex working condition is explained.

When the head end and the tail end of the GIL are directly connected with the cable in the underground pipe gallery, the electric disconnection between the GIL and the cable terminal and between the GIL and the cable part are ensured when the GIL is in site pressure resistance:

1) When the GIL is installed for the first time, the GIL cannot be directly connected with the cable, and the GIL can be directly connected with the cable part after the GIL is subjected to the field withstand voltage test; the terminal shell is provided with a terminal end air chamber, wherein one end of the GIL is used as a pressurizing side, the cable terminal is not connected at first, then an insulation test tool conductor and the like which are in butt joint with a main loop of the GIL terminal are added in the terminal shell, and the GIL terminal air chamber is covered, so that the GIL field insulation test is finally realized, and the other end of the GIL is used as a non-pressurizing side, the cable terminal at the cable side is not connected at first or is connected at first, but a detachable conductor for electric connection in the terminal shell cannot be installed, and the terminal shielding ball at the terminal of the GIL terminal main loop is connected, so that electric disconnection is realized. And after the GIL field insulation test is carried out phase by phase, carrying out electric connection of the cable terminal at the head end and the tail end of the GIL.

2) When the GIL is in fault during operation, if an insulation voltage withstand test after rush repair is implemented, any one end of the initial end of the GIL is required to be used as a pressurizing side, and when any one end of the pressurizing side GIL is in butt joint with an insulation test tool, a cable and a cable terminal which are originally connected with the pressurizing side GIL are required to be disassembled and pulled out from the end of the GIL, then a tool conductor and the like for the GIL voltage withstand test are connected in butt joint, and a gas chamber at the end of the GIL is sealed, so that the independence of the GIL field insulation voltage withstand test of the phase is realized; the other two phases of the pressurizing side GIL are electrically disconnected, and each phase is considered to need a voltage withstand test, so that the cable terminal can be disassembled in advance to realize the electrical disconnection or the cable terminal can be temporarily not disassembled, only the detachable conductor for electrical connection in the terminal shell is disassembled, and the GIL terminal main loop is provided with a terminal shielding ball to realize the electrical disconnection; the non-pressurizing side GIL does not need to disassemble the cable terminal, only needs to disassemble the detachable conductor for electric connection in the terminal shell of each phase, and installs an upper end shielding ball on the main loop of each phase end of the GIL to realize electric disconnection; after GIL phase-by-phase voltage withstanding is completed, the cable terminal and the cable are connected again.

When the head end and the tail end of the GIL are directly connected with the cable in the underground pipe gallery, the voltage withstand test butt joint ports are not directly reserved in the prior art, and the voltage withstand test of each phase of GIL needs corresponding test butt joint ports, so that the voltage withstand test butt joint ports of each phase of GIL need to be obtained in a mode of repeatedly disassembling and installing the cable and the cable terminal:

1) After the GIL is installed for the first time, because the test butt joint ports are needed to be reserved for each phase of insulation and voltage withstand test of the GIL, the butt joint ports of the GIL voltage withstand test cannot be directly connected with the cables and the cable terminals, and in addition, the butt joint positions of the non-voltage withstand test ports of the GIL are required to be disconnected with the cables and the cable terminals, if the cables and the cable terminals are already installed, the detachable conductors for electric connection in the terminal shell still need to be disassembled, and the terminal shielding balls of the main circuit installation ends of the GIL ends are required to be disassembled, so that the electric disconnection is realized; the connection between the GIL and the cable terminal can be implemented after all phases of the GIL are subjected to the field voltage withstand test.

2) If the post-rush repair insulation voltage withstand test is implemented after the fault occurs in the GIL operation, the electrical connection between the initial end of the GIL and the cable terminal is disconnected, the cable connected to any one of the initial end of the GIL and the cable terminal are disassembled and pulled out from the terminal of the GIL, then tooling conductors for the GIL voltage withstand test are connected in pairs, the independence of the GIL field insulation voltage withstand test is realized, and the connection between the GIL and the cable terminal can be implemented after each phase of the GIL completes the field voltage withstand test.

Therefore, the method brings complex procedures such as disassembling and reinstalling the cable side in the underground pipe gallery with limited space, and increases a series of uncontrollable safety risk factors such as airtight connection failure, insulating capability reduction and the like in the secondary butt joint process after the cable side is disassembled.

Disclosure of Invention

An object of the embodiment of the application is to provide a GIL head end and cable directly link structure and in underground pipe gallery, GIL and cable are once only installed in place, under the condition that the cable terminal is not dismantled, demolish the terminal main loop end detachable conductor of GIL in the terminal housing, form the electric isolation fracture, dock GIL withstand voltage equipment through the test interface that the transition tee bend unit between GIL and the cable terminal reserved simultaneously, finally realize GIL alone on-the-spot withstand voltage test, effectively reduce the installation process cross waiting period of GIL and cable, thereby solve the problem in the background art.

In order to solve the technical problem, the technical scheme of the direct connection structure between the head and the tail ends of the GIL and the cable in the underground pipe gallery provided by the embodiment of the application is as follows:

the utility model provides a GIL head end and cable are in underground pipe gallery directly connected structure, includes underground pipe gallery, first feed inlet, second feed inlet, electrically conductive subassembly, tee bend unit and GIL three-phase split phase unit set up in the underground pipe gallery, first feed inlet and second feed inlet set up in on the underground pipe gallery, electrically conductive subassembly is connected with tee bend unit, and tee bend unit is connected with GIL three-phase split phase unit.

In a preferred embodiment of any of the foregoing aspects, the conductive assembly includes a cable, a cable termination, and a termination housing, the cable being connected to the cable termination, the cable termination being connected to the termination housing.

In a preferred embodiment of any of the foregoing aspects, the conductive assembly further comprises a cable support connected to the cable, the cable support being disposed on the mounting platform.

In a preferred embodiment of any of the foregoing aspects, the GIL head-to-tail end and cable is configured to be directly connected within the underground utility tunnel, further comprising an access panel and a cable termination access opening, the cable termination access opening being disposed on the terminal housing, and the access panel being disposed on the cable termination access opening.

In the preferred embodiment of any one of the above schemes, the three-way unit is communicated with a GIL withstand voltage test interface, a test interface cover plate is arranged on the GIL withstand voltage test interface, and the GIL withstand voltage test tool is connected with the test interface cover plate.

In the preferred embodiment of any of the foregoing solutions, the direct connection structure between the head and the tail of the GIL and the cable in the underground pipe gallery further includes a GIL pressure-resistant pair interface, the GIL pressure-resistant pair interface is communicated with the tee unit, and a pressure-resistant cover plate is disposed on the GIL pressure-resistant pair interface.

In a preferred embodiment of any of the foregoing aspects, the direct connection structure between the head and the tail of the GIL and the cable in the underground pipe gallery further includes a shielding ball, where the shielding ball is disposed in the terminal housing.

In a preferred embodiment of any of the above aspects, the conductive members are provided in a plurality of groups and are connected between each two groups.

In a preferred embodiment of any of the above, the cable support is provided with a plurality of cable supports.

Compared with the prior art, the GIL head end and cable direct connection structure in the underground pipe gallery has the advantages that the GIL and the cable are installed in place at one time, the main loop end detachable conductor of the GIL in the terminal shell is removed under the condition that the cable terminal is not detached, an electrical isolation fracture is formed, meanwhile, the GIL pressure-resistant equipment is abutted through the test interface reserved by the transition tee unit between the GIL and the cable terminal, the GIL single-site pressure-resistant test is finally realized, and the cross waiting period of the installation procedure of the GIL and the cable is effectively reduced.

Compared with the prior art, the GIL head end and cable direct connection structure in the underground pipe gallery has the advantages that the GIL and the cable are installed in place at one time, the main loop end detachable conductor of the GIL in the terminal shell is removed under the condition that the cable terminal is not detached, an electrical isolation fracture is formed, meanwhile, the GIL pressure-resistant equipment is abutted through the test interface reserved by the transition tee unit between the GIL and the cable terminal, the GIL single-site pressure-resistant test is finally realized, and the cross waiting period of the installation procedure of the GIL and the cable is effectively reduced.

When GIL fails, the cable terminal does not need to be disassembled, the operation of the step 1 is repeated to realize the independent field withstand voltage test again after the GIL is rush-repaired, the complex procedures of troublesome and laborious disassembly and reinstallation of the cable side in the underground pipe gallery with limited space are perfectly avoided, a series of uncontrollable safety factors such as airtight connection failure, insulating capability reduction and the like during secondary butt joint of the cable side are avoided, and the quality of the installation and test process is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. Some specific embodiments of the present application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify identical or similar components or portions thereof, and it should be understood by those skilled in the art that the drawings are not necessarily drawn to scale and that:

fig. 1 is a schematic view of a straight connection structure between the first end of GIL and a cable in an underground pipe gallery according to an embodiment of the present application.

Fig. 2 is a plan view of the M-direction of the straight connection pattern 1 of the GIL head-end and the cable in the underground pipe gallery according to the embodiment of the present application.

Fig. 3 is a schematic diagram of the voltage withstanding structure of the direct connection between the first end of GIL and the cable in the underground pipe rack according to the embodiment of the present application.

Fig. 4 is a plan view of the top end of GIL and the cable in the straight joint pattern 3 in the underground pipe gallery according to the embodiment of the present application.

Fig. 5 is a schematic diagram illustrating butt joint between an initial end of GIL and any phase of an insulation test tool on a pressurized side of a direct connection structure GIL of a cable in an underground pipe gallery according to an embodiment of the present application.

Fig. 6 is a schematic diagram of the connection structure GIL of the first end of GIL and cable in the underground pipe gallery, electrically disconnected from the cable and the cable terminal, without disassembling the cable terminal.

Fig. 7 is a schematic diagram of a GIL pressure-resistant interface reserved by a tee unit of a direct connection structure between the head and the tail of the GIL and a cable in an underground pipe gallery according to an embodiment of the present application.

Fig. 8 is a side view of fig. 7 in a straight connection configuration of the head end of GIL and cable in an underground utility tunnel according to an embodiment of the present application.

Fig. 9 is a schematic structural view of the GIL according to the embodiment of the present application in a non-disconnected state in which the GIL is electrically connected to the cable terminal in the in-tunnel direct connection structure.

Reference numerals in the drawings: underground pipe gallery 1, first feed opening 11, second feed opening 12, cable 2, cable support 21, cable termination 3, terminal casing 31, access cover 32, cable termination access opening 33, GIL withstand voltage test interface 34, test interface cover 35, tee unit 4, GIL three-phase split-phase unit 5, GIL withstand voltage interface 6, mounting platform 7, shielding ball 8, detachable conductor 9.

Detailed Description

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It is to be understood that the described embodiments are merely partial embodiments of the present application and not full embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The following embodiments of the present application will be described in detail with reference to the example of the straight connection structure of the GIL head and tail ends and the cables in the underground pipe gallery and the pressure test method thereof having front wheels and rear wheels, but the embodiments should not limit the scope of the present application.

In this application, the term interpretation: GIL: a rigid gas-insulated power transmission line with a central conductive rod, an epoxy support and the like, which is enclosed by a rigid metal shell and filled with insulating gas. And (3) a cable terminal: devices mounted at the end of the cable, in electrical connection with other parts of the system, and kept insulated up to the connection point.

Examples

As shown in fig. 1 to 3, the embodiment of the application provides a direct connection structure of GIL head end and cable in an underground pipe gallery, which comprises an underground pipe gallery 1, a first feeding hole 11, a second feeding hole 12, a conductive component, a tee joint unit 4 and a GIL three-phase split-phase unit 5, wherein the conductive component, the tee joint unit 4 and the GIL three-phase split-phase unit 5 are arranged in the underground pipe gallery 1, the first feeding hole 11 and the second feeding hole 12 are arranged on the underground pipe gallery 1, the conductive component is connected with the tee joint unit 4, and the tee joint unit 4 is connected with the GIL three-phase split-phase unit 5.

As shown in fig. 1 to 4, the conductive assembly includes a cable 2, a cable terminal 3, and a terminal housing 31, the cable 2 is connected with the cable terminal 3, the cable terminal 3 is connected with the terminal housing 31, the conductive assembly further includes a cable support 21, the cable support 21 is connected with the cable 2, the cable support 21 is disposed on the mounting platform 7, the conductive assembly is provided with a plurality of groups, and a plurality of cable supports 21 are disposed between every two groups.

As shown in fig. 1 to 4, the GIL head end and cable direct connection structure in the underground pipe gallery further comprises an access cover plate 32 and a cable terminal access hole 33, the cable terminal access hole 33 is arranged on the terminal housing 31, the access cover plate 32 is covered on the cable terminal access hole 33, the tee joint unit 4 is communicated with a GIL withstand voltage test pair interface 34, a test pair interface cover plate 35 is arranged on the GIL withstand voltage test pair interface 34, a GIL withstand voltage test tool is connected with the test pair interface cover plate 35 and further comprises a GIL withstand voltage pair interface 6, the GIL withstand voltage pair interface 6 is communicated with the tee joint unit 4, the GIL withstand voltage pair interface 6 is provided with a withstand voltage cover plate and further comprises a shielding ball 8, and the shielding ball 8 is arranged in the terminal housing 31.

Compared with the prior art, the GIL head end and cable direct connection structure in the underground pipe gallery has the advantages that the GIL and the cable are installed in place at one time, the main loop end detachable conductor of the GIL in the terminal shell is removed under the condition that the cable terminal is not detached, an electrical isolation fracture is formed, meanwhile, the GIL pressure-resistant equipment is abutted through the test interface reserved by the transition tee unit between the GIL and the cable terminal, the GIL single-site pressure-resistant test is finally realized, and the cross waiting period of the installation procedure of the GIL and the cable is effectively reduced.

In order to realize the GIL field withstand voltage test under the condition that the cable terminal is not disassembled when the head end of the GIL is directly connected with the cable in the underground pipe gallery, the technical scheme of the utility model is explained in detail.

In engineering application, the GIL head and tail ends and cables are directly connected in the underground pipe gallery.

When the GIL head and tail ends are directly connected with the cable 2, the compact pipe gallery three-dimensional space vertical lateral arrangement is adopted, the space size of personnel construction, maintenance and test is met, the GIL branch outlets are respectively connected with the tee joint unit 4 (with an insulation and pressure resistance test butt joint interface), and then are directly connected with the cable 2 and the cable terminal 3, during installation, the movable installation platform 7 is used for high-level installation, after the installation is completed, the installation platform 7 moves out of the first feeding port 11 or the second feeding port 12, and finally, the electric connection is completed, as shown in fig. 1 to 4, the GIL head and tail ends of the utility model are all connected with the GIL field pressure resistance technical scheme when the cable is directly connected in the underground pipe gallery.

When the GIL is subjected to pressure resistance after the first installation, a detachable conductor 9 in a terminal housing 31 at the first end of the GIL is firstly removed, then a shielding ball 8 is installed to form an electric fracture, a GIL insulation pressure resistance test tool is introduced into the underground pipe gallery 1 from the ground, electric connection with the GIL is realized through a GIL pressure resistance pair interface 6 reserved at the side surface of a tee unit 4 at any one end of the GIL serving as a pressurizing side, and after the gas filling is finished, GIL phase-by-phase insulation pressure resistance test operation is carried out.

When the GIL breaks down during operation, if the post-rush repair insulation and withstand voltage test is implemented, the detachable conductor 9 in the terminal housing 31 at the head end of the GIL is firstly removed, then the shielding ball 8 is installed to form an electrical fracture, the GIL insulation and withstand voltage test tool is introduced into the underground pipe gallery from the ground, the electrical connection with the GIL is realized through the GIL insulation and withstand voltage pair interface reserved at the side surface of the tee unit at any one end of the GIL serving as the pressurizing side, the GIL phase-by-phase insulation and withstand voltage test operation is performed after the inflation is completed, the operation process is the same as the insulation and withstand voltage mode when the GIL is installed for the first time, the cable terminal 3 is not required to be removed, the operation is safe and convenient, and the rush repair time can be greatly saved.

After each phase of GIL has completed the field withstand voltage test, a detachable conductor 9 between the terminal conductor of the GIL main loop and the cable terminal is installed, and the electrical connection between GIL and the cable terminal is restored (as shown in fig. 9).

Therefore, in the embodiment of the utility model, when the GIL and the cable are directly connected in the underground pipe gallery 1, the GIL and the cable 2 are installed in place at one time, the tee unit 4 (the reserved insulating GIL withstand voltage test interface) is added to obtain the insulating GIL withstand voltage test interface 34 under the condition that the cable terminal 3 is not dismounted, the complicated procedure of obtaining the insulating GIL withstand voltage test interface 34 by dismounting the cable terminal 3 is omitted, the unsafe factor caused by repeatedly dismounting the cable terminal of the cable is avoided, the independent field withstand voltage test of the GIL is finally realized, and the independent field withstand voltage test again after the repair of the GIL can be realized without dismounting the cable terminal.

As shown in fig. 5 to 9, in a pressure test method for a direct connection structure of the head and tail ends of GIL and cables in an underground pipe gallery, when the head and tail ends of GIL are directly connected with cables, branch outlets of each phase of GIL are respectively connected with a tee unit 4 (with a pressure test interface), and then are directly connected with a cable 2 and a cable terminal 3; the GIL insulation withstand voltage test is carried out by dismantling the main loop end detachable conductor 9 of the GIL in the terminal housing 31 without dismantling the cable terminal 3 to form an electrical isolation fracture, and meanwhile, the GIL insulation withstand voltage test pair interface 34 reserved by the transition tee unit between the GIL and the cable terminal 3 is used for butt joint of GIL withstand voltage equipment, so that the GIL single field withstand voltage test is finally realized, and in the withstand voltage operation process, the cross waiting period of the installation procedures of the GIL and the cable is effectively reduced.

As shown in fig. 5 to 9, a pressure test method for a direct connection structure of a GIL head end and a cable in an underground pipe gallery, the method comprising the steps of:

step 1: opening an overhaul cover plate 32 at the first feeding port and the second first feeding port, penetrating through a cable terminal overhaul port 33, removing a detachable conductor 9 in a terminal shell 31 at the head end and the tail end of the GIL, and then installing a shielding ball 8 to form an electric fracture;

step 2: opening a GIL voltage-resistant cover plate reserved on the side surface of the tee unit 4 at any one end of the GIL serving as a pressurizing side, and installing an insulation test tool conductor through a GIL voltage-resistant pair interface 6;

step 3: introducing the GIL insulation and voltage withstand test tool into the underground pipe gallery 1 from the ground, connecting the GIL insulation and voltage withstand test tool to the GIL voltage withstand interface 6 to realize electric connection with the GIL, and performing GIL phase-by-phase insulation and voltage withstand test operation after inflation is completed;

step 4: after the numbers of each phase at the head end and the tail end of the GIL are set as phase A1/phase A2, phase B1/phase B2 and phase C1/phase C2, and the end sides of the phase A2 are electrically connected with the GIL insulation voltage withstand test tool, the end sides of the phase A1 and the phase B1/B2 are all required to be disassembled, the cable 2 in the terminal shell 31 is only required to be disassembled, the shielding ball 8 is installed, and then an electric fracture is formed, and then a main loop insulation voltage withstand test from the end of the GIL phase A2 to the end of the phase A1 is implemented.

And so on:

after the end side of the phase B2 is electrically connected with the GIL insulation withstand voltage test tool, the end sides of the phase B1 and the phase A1/the phase A2 are all required to be disassembled to remove the detachable conductor 9 in the terminal shell, the shielding ball 8 is installed, an electric fracture can be formed, and then the main loop insulation withstand voltage test from the end of the GIL phase B2 to the end of the phase B1 is implemented.

After the end side of the phase C2 is electrically connected with the GIL insulation withstand voltage test tool, the end sides of the phase C1 and the phase B1/the phase B2 are all required to be disassembled to remove the detachable conductor 9 in the terminal shell 31, the shielding ball 8 is installed, an electric fracture can be formed, and then the main loop insulation withstand voltage test from the end of the GIL phase C2 to the end of the phase C1 is implemented.

And after each phase of the GIL is subjected to the field withstand voltage test, a detachable conductor 9 between the terminal conductor of the main loop of the GIL and the cable terminal 3 is installed, and the electrical connection between the GIL and the cable 2 and the cable terminal 3 is restored.

After the GIL fails in operation, if the post-rush repair insulation voltage withstand test is implemented, the cable terminal 3 is not required to be disassembled, the operation of the step 1 is repeated to realize the re-independent field voltage withstand test after the GIL is rush repaired, the cable terminal is not required to be disassembled in the operation process like the insulation voltage withstand mode in the first installation, the operation is safe and convenient, the rush repair time can be greatly saved, the complicated procedures are effectively reduced, and the quality of the installation and test processes is improved.

Compared with the prior art, according to the voltage withstand test method of the GIL head end and cable direct connection structure in the underground pipe gallery, the GIL and the cable are installed in place at one time, the detachable conductor at the GIL main loop end in the terminal shell is removed under the condition that the cable terminal is not detached, an electrical isolation fracture is formed, meanwhile, the GIL voltage withstand equipment is butted through the test interface reserved by the transition tee unit between the GIL and the cable terminal, the independent field voltage withstand test of the GIL is finally realized, and the cross waiting period of the installation procedure of the GIL and the cable is effectively reduced.

When GIL fails, the cable terminal does not need to be disassembled, the operation of the step 1 is repeated to realize the independent field withstand voltage test again after the GIL is rush-repaired, the complex procedures of troublesome and laborious disassembly and reinstallation of the cable side in the underground pipe gallery with limited space are perfectly avoided, a series of uncontrollable safety factors such as airtight connection failure, insulating capability reduction and the like during secondary butt joint of the cable side are avoided, and the quality of the installation and test process is improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or the technical features of the components or the whole components can be replaced equivalently; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (7)

1. The utility model provides a GIL head end and cable are in underground pipe gallery direct connection structure, its characterized in that includes underground pipe gallery, first feed inlet, second feed inlet, electrically conductive subassembly, tee bend unit and GIL three-phase split phase unit set up in the underground pipe gallery, first feed inlet and second feed inlet set up in on the underground pipe gallery, electrically conductive subassembly is connected with tee bend unit, tee bend unit and GIL three-phase split phase unit connection;

the conductive assembly comprises a cable, a cable terminal and a terminal shell, wherein the cable is connected with the cable terminal, and the cable terminal is connected with the terminal shell;

the conductive assembly further comprises a cable support, wherein the cable support is connected with the cable, and the cable support is arranged on the mounting platform.

2. The GIL head-to-tail end and cable in-the-tunnel direct connection structure of claim 1, further comprising an access panel and a cable termination access port, wherein the cable termination access port is disposed on the terminal housing and the access panel cover is disposed on the cable termination access port.

3. The direct connection structure of the head end of the GIL and the cable in the underground pipe gallery according to claim 2, wherein the tee joint unit is communicated with a GIL withstand voltage test interface, a test interface cover plate is arranged on the GIL withstand voltage test interface, and the GIL withstand voltage test tool is connected with the test interface cover plate.

4. The GIL head-to-tail end and cable direct connection structure in underground pipe gallery of claim 3, further comprising a GIL pressure-resistant pair interface, wherein the GIL pressure-resistant pair interface is communicated with the tee unit, and a pressure-resistant cover plate is arranged on the GIL pressure-resistant pair interface.

5. The GIL head-to-tail end and cable in-the-ground duct work direct connection structure of claim 4, further comprising a shield ball disposed within the terminal housing.

6. The GIL head-to-tail end and cable direct connection structure in an underground utility tunnel of claim 5, wherein the conductive assemblies are provided in multiple groups and are connected between each two groups.

7. The GIL head-to-tail end and cable direct connection structure in an underground utility tunnel of claim 6, wherein the cable support is provided in plurality.

Images