Small resistance grounding complete set device fast installation equipment and installation method thereof

Abstract

The application relates to the field of power grid technical transformation engineering, and provides a small-resistance grounding complete device fast installation equipment and an installation method thereof. The installation equipment comprises a grounding transformer, an arc suppression coil, a small resistance and a peripheral fence located outside the installation equipment, and further comprises a switching switch. The grounding point of the grounding transformer is connected in parallel to the arc suppression coil and the small resistance through the switching switch. The grounding is switched by the switching switch to be connected to the arc suppression coil or the small resistance through the switching switch. The switching switch is installed on the peripheral fence through an installation support. The prefabricated installation support can be used for quickly installing the switching switch on the upgrading and reconstruction site, so that the main components to be installed in the upgrading and reconstruction can be quickly installed, the installation time of the above equipment can be effectively improved, and the power grid outage time is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power grid technical improvement projects, and particularly relates to a small-resistance grounding complete set device fast installation equipment and an installation method thereof. BACKGROUND

[0002] With the development of economic society, the use of cables is more and more extensive, and with the increase of cable use, the capacitive current level of the power grid is rapidly increased. When the existing arc suppression coil grounding device occurs single-phase grounding fault, the non-fault phase capacitive current is increased due to not removing the load, which brings hidden dangers to the operation of the equipment, and even destroys the equipment.

[0003] The existing arc suppression coil grounding device in the region with capacitive current exceeding the standard is reformed into an arc suppression coil parallel small-resistance grounding device. However, in the reform process, the original equipment needs to be removed after power failure, and then the foundation is constructed, and finally the new equipment is replaced and the wiring is completed. There are still problems of long reform period and long power failure time in the whole process. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a small-resistance grounding complete set device fast installation equipment and an installation method thereof, so as to reduce the power failure time, realize that the switching switch is separated by the guardrail and is installed on the outside, and improve the operation and maintenance efficiency.

[0005] The first aspect of the present application provides a small resistance grounding complete set fast installation equipment, which comprises a grounding transformer, an arc suppression coil, a small resistance and a peripheral fence outside the installation equipment, and further comprises a switching switch, the switching switch is connected to the small resistance loop, the small resistance with the switching switch is connected in parallel with the arc suppression coil and is connected to the neutral point of the grounding transformer, the switching switch is used to form arc suppression coil grounding or arc suppression coil parallel small resistance grounding through switching, the switching switch is installed outside the peripheral fence through an installation support, the switching switch is separated from the grounding transformer and the arc suppression coil by the peripheral fence, a high voltage contactor is arranged between the switching switch and the small resistance, a current transformer and an automatic controller are further arranged at the small resistance grounding end, the installation support comprises a plurality of legs, a horizontal connecting beam and a first expansion mounting frame, the plurality of legs are respectively vertically supported on the horizontal connecting beam at the top of the four corners of the installation support, the first expansion mounting frame is assembled and connected between two legs, the switching switch is installed on the first expansion mounting frame, the legs comprise rigid support rods and prestressed support rods which are supported on the ground, the prestressed support rods are obliquely supported on the ground, the rigid support rods are obliquely forward or backward, the rigid support rods are away from the peripheral fence at the bottom end, the prestressed support rods are connected to the rigid support rods at the connecting points in the middle of the rigid support rods, the prestressed support rods satisfy 0.7a<b<0.95a, wherein a is the length of the rigid support rod, which is the length from the connecting point to the ground; b is the vertical distance of the prestressed support rod, the prestressed support rod comprises a rigid section and an energy storage section, and the energy storage section is a spring.

[0006] According to an embodiment of the present application, the switching switch is installed on the installation support, and the installation support is across the peripheral fence.

[0007] According to an embodiment of the present application, the rigid support rod is a two-section or multi-section structure, at least comprising a straight section and an inclined section, the upper at least one straight section of the rigid support rod is parallel to the peripheral fence, and the lower at least one inclined section of the rigid support rod is not parallel to the peripheral fence and is away from the peripheral fence.

[0008] According to an embodiment of the present application, an inverted U-shaped cross-space is formed in the installation support, and the cross-space is across the peripheral fence.

[0009] According to an embodiment of the present application, a second expansion mounting frame is further provided, and the second expansion mounting frame is a small resistance monitoring and indicating panel.

[0010] According to an embodiment of the present application, the two legs are provided with connecting members corresponding to the first and second extension mounting racks, and the first and second extension mounting racks are configured with interface members capable of being assembled and connected with the connecting members.

[0011] According to an embodiment of the present application, the switching switch comprises a single-phase isolation knife switch or a contactor.

[0012] According to an embodiment of the present application, the switching switch is one, two, three or six; when the switching switch is three, the three switching switches are connected in parallel and then connected in series with the small resistance; when the switching switch is six, three switching switches are connected in series to form a series switching switch group, and two series switching switch groups are connected in parallel and then connected in series with the small resistance.

[0013] In another aspect, a method for installing a small-resistance grounding complete set fast installation device is provided,

[0014] The method comprises the following installation steps: 1) powering off the small-resistance grounding complete set including a grounding transformer, an arc suppression coil and a small resistance; 2) fixing and installing a mounting bracket; 4) installing a switching switch; 5) wiring the switching switch to the grounding transformer, the arc suppression coil and the small resistance device; and 6) powering on and selecting an operation mode of the small-resistance grounding complete set through the switching switch outside the peripheral fence. The method for installing a small-resistance grounding complete set fast installation device can facilitate the installation of the switching switch, reduce the power-off time and achieve the purpose of fast installation.

[0015] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0016] The device of the embodiment is based on the small-resistance grounding technology, maintains the advantages of small-resistance grounding mode, such as fast isolation of faults and high accuracy, and learns the technical advantages of the arc suppression coil in the resonance grounding technology, so that the technical solution simultaneously has the characteristics of effectively compensating for instantaneous grounding faults and greatly reducing the line trip rate.

[0017] Moreover, the pre-prepared mounting bracket can be used to quickly install the switching switch at the upgrading and reconstruction site, so as to facilitate the quick installation of the main components to be installed in the upgrading and reconstruction, and effectively improve the installation time of the above device, thereby reducing the power-off time of the power grid. At the same time of reducing the power-off time, the switching switch is installed outside the fence, thereby improving the operation and maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0020] Figure 1 A structure schematic diagram of a grounding complete set device for an embodiment.

[0021] Figure 2 A structure schematic diagram of a quick installation equipment of a small resistance grounding complete set device provided by an embodiment of the present application;

[0022] Figure 3 A top view structure schematic diagram of an installation support of the quick installation equipment provided by an embodiment of the present application;

[0023] Figure 4 A side view structure schematic diagram of the installation support of the quick installation equipment provided by an embodiment of the present application;

[0024] Figure 5 A front view structure schematic diagram of the installation support of the quick installation equipment provided by an embodiment of the present application;

[0025] Figure 6 A front view structure schematic diagram of the installation support of the quick installation equipment provided by another embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the protection scope of the present application.

[0027] Figure 1 A structure schematic diagram of a grounding complete set device for an embodiment. A quick installation equipment of a small resistance grounding complete set device is exemplified, which mainly comprises a grounding transformer 1, an arc suppression coil 2, a small resistance 12 and a peripheral guardrail 16 outside the installation equipment. In the embodiment, the grounding line of the grounding transformer 1 is connected in series through the arc suppression coil 2 and then the small resistance 12. However, after the small resistance grounding is adopted, when a grounding fault occurs, the line protection will be directly disconnected, which will cause the arc suppression coil 2 to fail to play its due role, and once the small resistance grounding system has a grounding fault, the fault line will be removed, which will cause the line to frequently trip, and the system operation reliability is not high.

[0028] Figure 2 This application provides a schematic diagram of a rapid installation device for a small resistance grounding assembly. As shown in the figure, this application provides a rapid installation device for a small resistance grounding assembly, which mainly includes a grounding transformer 1, an arc suppression coil 2, a small resistor 12, and an outer guardrail 16 surrounding the installation device. It also has a switching switch 10. The grounding point of the grounding transformer 1 is connected in parallel to the arc suppression coil 2 and the small resistor 12 through the switching switch 10. The switching switch 10 can be used to switch between grounding the arc suppression coil 2 or the small resistor 12. The switching switch 10 is installed on the outer guardrail 16 through a mounting bracket.

[0029] In this embodiment, the switching switch 10 is used to switch between two grounding paths. The first path is connected in series with the arc suppression coil 2 and the small resistor 12, and the second path is grounded through the small resistor 12. This embodiment's device, based on the small resistance grounding technology, retains the advantages of fast and accurate fault isolation, while also incorporating the advantages of the arc suppression coil in resonant grounding technology. This allows the solution to effectively compensate for transient grounding faults and significantly reduce line tripping rates.

[0030] In addition, a high-voltage contactor 14 is configured between the switch 10 and the small resistor 12 to facilitate arc extinguishing contact; and a current transformer 13 is also configured at the grounding terminal of the small resistor 12 to facilitate the detection of grounding current signal, which can be transmitted to an automatic controller for automatic control or external output prompt signal.

[0031] In Figure 1 The example arc suppression coil grounding device was modified to Figure 2 When the arc suppression coil is connected in parallel with a small-resistance grounding device, an additional switching switch is required. Due to the limited power outage time and the lack of a supporting structure for the mesh barrier of the complete arc suppression coil grounding device, while the live equipment must be separated by the mesh barrier to ensure a safe distance, it is an urgent problem to quickly install the additional single-phase isolating switch to put the arc suppression coil connected in parallel with a small-resistance grounding device into operation as soon as possible and reduce power outage time without breaking the mesh barrier of the complete arc suppression coil grounding device.

[0032] Furthermore, the prefabricated mounting brackets allow for the rapid installation of switchover switches at the upgrade site, facilitating the quick installation of key components during the upgrade process. This effectively reduces the installation time of the aforementioned equipment and consequently minimizes power outage time.

[0033] Figure 3 This is a top view of the mounting bracket structure of the quick-installation equipment provided in an embodiment of this application. Figure 4 A side view of the mounting bracket structure of the quick-installation device provided in the embodiments of this application, andFigure 5 The front view structure diagram of the mounting bracket of the fast installation equipment provided by the embodiment of the application is shown.

[0034] As shown in the diagram, the switch 10 is fixed to the outer fence 16 by the mounting bracket 20 in the embodiment, and the mounting bracket 20 is straddled on the outer fence 16. The mounting bracket 20 includes a plurality of legs 21, a horizontal connecting beam 22 and a first extension mounting frame 26. The plurality of legs 21 are respectively vertically supported at the top of the horizontal connecting beam 22 at four corners of the mounting bracket 20, and the first extension mounting frame 26 is assembled and connected between two legs, and the switch 10 is mounted on the first extension mounting frame 26. The mounting bracket 20 internally forms a reverse U-shaped straddling space, and the straddling space is straddled on the outer fence 16.

[0035] According to an embodiment of the application, the switch 10 includes a single-phase isolation knife switch or contactor, so as to manually or automatically switch on at least two passages. The first extension mounting frame 26 can be a steel plate, and has a hole or a clamping position for mounting the switch 10, and the first extension mounting frame 26 can have a screw hole or a clamping port on both sides for assembling with the legs 21. Correspondingly, the legs 21 can be provided with a corresponding docking member inward, such as a pipe port protruding inward, and the outer end of the first extension mounting frame 26 can be a small pipe capable of sleeving with the pipe port, and can be fixed by using a bolt or other fastening member.

[0036] In another specific embodiment, the switch can be one, two, three or six. When the switch is three, the three switches are connected in parallel and then connected in series with the small resistance. When the switch is six, three switches are connected in series to form a series switch group, and two series switch groups are connected in parallel and then connected in series with the small resistance.

[0037] It should be understood that the mounting bracket 20 can be welded by a circular or square steel pipe, or can be manufactured by various steel profiles, and is not limited to this. The bottom of the leg 21 can be fixed to the ground in various forms of supporting feet or a bottom plate for expansion bolt fixation.

[0038] According to the embodiment of the present application, the leg 21 comprises a rigid support rod 24 and a prestressed support rod 25, both of which are supported on the ground, and the prestressed support rod 25 is supported on the ground in a slanting outward direction. The rigid support rod 24 is a slanting forward or backward rod, and the rigid support rod 24 is away from the outer guardrail 16 at the bottom end. The prestressed support rod 25 is connected to the rigid support rod 24 at a connecting point in the middle of the rigid support rod 24, and the prestressed support rod 25 satisfies 0.7a < b < 0.95a, wherein a is the length of the rigid support rod, which is the length from the connecting point to the intersection with the ground, and b is the vertical distance of the prestressed support rod 25.

[0039] As shown in the figure, the rigid support rod 24 is selected to be a two-segment or multi-segment structure, which at least comprises one straight segment and one inclined segment. The upper at least one straight segment of the rigid support rod 24 is parallel to the outer guardrail 16, and the lower at least one inclined segment of the rigid support rod 24 is not parallel to the outer guardrail 16 and is away from the outer guardrail 16, so as to prevent the support from falling forward or backward. This structure can make the upper space of the installation support compact and the lower space stable. Figures 3 to 5

[0040] According to the embodiment of the present application, the prestressed support rod 25 comprises a rigid segment and an energy storage segment, and the energy storage segment is a spring. The prestressed support rod 25 is in a compressed state during installation, so as to push the leg 21 inward from both sides, which can support the quick installation support 2 and also has a shockproof effect, so as to make the installation support 2 more stable.

[0041] Figure 6 The figure is a front view structural schematic diagram of the installation support of the quick installation equipment provided by another embodiment of the present application. There is also a second expansion mounting rack 27, which is a small resistance monitoring indication panel. Two legs 21 corresponding to the first expansion mounting rack 26 and the second expansion mounting rack 27 are provided with connecting pieces, and the first expansion mounting rack 26 and the second expansion mounting rack 27 are both configured with interface pieces capable of being assembled and connected to the connecting pieces.

[0042] The connecting piece can also be an opening, and the interface piece can be a clamping piece that can be elastically clamped into the opening, so as to be quickly assembled to the leg 21.

[0043] In another aspect of the present application, a small resistance grounding complete device quick installation equipment is provided, and the installation method of the small resistance grounding complete device quick installation equipment is as follows:

[0044] 1) Power off the small resistance grounding complete device comprising the grounding transformer, the arc suppression coil and the small resistance;

[0045] 2) Fix the installation support; ​

[0046] 4) Install the aforementioned switch;

[0047] 5) Wiring connecting the switching switch to the grounding transformer, the arc suppression coil, and the small resistance device;

[0048] 6) Power on the device and select the operating mode of the low-resistance grounding device through the switch on the outside of the outer guardrail.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A small resistance grounding complete set quick installation equipment, comprising a grounding transformer, an arc suppression coil, a small resistance and a peripheral fence outside the installation equipment, characterized in that, The switch is installed on the mounting bracket, and the mounting bracket is straddled on the outer fence.

2. A low resistance grounded kit quick installation device according to claim 1, characterized in that, The rigid support rod is a two-segment or multi-segment structure, and at least contains one straight segment and one inclined segment.

3. A low resistance grounded kit quick installation device according to claim 2, characterized in that, The mounting bracket is internally formed with a reverse U-shaped straddling space, and the outer fence is straddled through the straddling space.

4. The low resistance grounding kit quick installation apparatus of claim 2, wherein, The mounting bracket is internally formed with a reverse U-shaped straddling space, and the outer fence is straddled through the straddling space.

5. The low resistance grounding kit quick installation apparatus of claim 2, wherein, The mounting device is a complete set of small-resistance grounding device quick mounting equipment of any one of claims 3 to 6, and comprises the following mounting steps:

6. A low resistance grounded kit quick installation device according to claim 5, characterized in that, 1) power off the complete set of small-resistance grounding device including the grounding transformer, the arc suppression coil and the small resistance; 7. A low resistance grounded complete set of equipment quick installation device according to any one of claims 1 to 6, characterized in that, 2) fix the mounting bracket; 8. The low resistance grounding kit quick installation apparatus of claim 4, wherein, 4) install the switch; 9. A method for installing a small resistance grounding kit quick installation device, characterized in that: ​ ​ ​ ​ 5) wiring connecting the switch to the grounding transformer, the arc suppression coil and the small resistance device; 6) energizing and selecting the mode of operation of the small resistance complete grounding device through the switch outside the outer fence.

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