CN116298521A - Auxiliary device for testing impedance of grounding grid - Google Patents

Abstract

The application relates to the technical field of power equipment, specifically provides a ground net impedance test auxiliary device, including main part, handle, wire guide subassembly and wire anticreep subassembly, the partly of the conductor part of main part is arranged in inserting the ground in order to ground, and the wire guide subassembly is arranged in accomodating the wire or redirecting the extending direction of wire, and wire anticreep subassembly constructs to prevent that the wire from deviating from on the wire guide subassembly. When the auxiliary device for testing the impedance of the grounding grid is used, the handle is convenient for a worker to hold so as to insert the conductor part of the main body into the ground. If frozen or hard soil is encountered, it is difficult for a worker to insert the body into the ground, who can hold one end of the handle and hammer down the top of the handle using a hammer, thereby inserting the body into the ground.

Description

Auxiliary device for testing impedance of grounding grid

Technical Field

The application relates to the technical field of power equipment, in particular to an impedance test auxiliary device for a grounding grid.

Background

The grounding grid is an important component of a power grid, and is a large horizontal net-shaped grounding device which is composed of vertical and horizontal grounding poles and used for power plants and power substations and has the functions of current leakage and voltage equalizing. The national standard "ground design Specification for alternating-current electric devices" GB/T50065-2011 specifies that the power plant and substation grounding grid should be laid with a manual grounding grid with a horizontal grounding electrode in addition to the natural grounding electrode. The grounding grid provides working grounding, protection grounding and lightning protection grounding for primary and secondary power equipment in the transformer substation. In other words, the power equipment in the station is reliably connected with the grounding network to obtain reference potential, such as a neutral point of a transformer, a shielding layer of a power cable, a secondary metering and measuring winding end of a current transformer and the like, and cannot work normally if the power equipment is not reliably connected with the grounding network; and the shell and the framework of the power equipment in the transformer substation are reliably connected with the grounding grid, so that the personal safety of operation and maintenance personnel of the transformer substation and operation or maintenance personnel is protected. Thirdly, the grounding grid provides a 'releasing channel' for power system fault current or lightning stroke current so as to protect power equipment and personnel safety in the station. The large-scale transformer substation grounding grid is a large-scale closed loop net structure formed by welding steel bars or other metals, and is generally controlled to be 0.6-0.8 m in deep burying, and the area of the grounding grid is approximately equal to that of a transformer substation ground surface building.

The measurement of the grounding impedance of the grounding grid is to judge the quality of the grounding grid by measuring the impedance of power equipment in a transformer substation to a remote potential zero point, and the physical significance of the characterization is that the deep buried closed loop artificial grounding grid structure is different from the real ground zero potential at infinity, in other words, the smaller the grounding resistance value is, the closer the grounding grid is to the ground zero potential. If the grounding resistance is too large, when a grounding fault occurs, the neutral point voltage offset is increased, and the sound phase and the neutral point voltage are possibly too high to exceed the insulation requirement level, so that the power equipment is damaged; when lightning stroke or lightning wave strikes, high residual voltage can be generated by high current, nearby equipment can be subjected to counterattack, the lightning resistance level of power equipment protected by a grounding grid is reduced, and personal safety of transformer substation operators and transformer maintenance personnel can be threatened.

The detection method of the grounding impedance of the transformer substation comprises a tripolar method and a quadrupole method, wherein the tripolar method refers to a current pole, a voltage pole and an in-station pole/test pole. The three-pole measurement is divided into a straight line method and an angle method, wherein the three-pole straight line method is the most widely applied method of the operation and maintenance management units of all levels of equipment at present.

The specific detection principle is shown in fig. 8, G is the pole in the station, P is the voltage pole, and C is the current pole. D represents the diagonal length of the power-transformation ground net. And during testing, the station inner poles (G) are respectively arranged below the grounding leads of important primary equipment with different voltage levels in the station. Taking a 220kV transformer substation as an example, the station inner pole needs to be sequentially connected to the grounding down-lead of important equipment such as a 220kV main transformer, a 110kV lightning arrester, a 10kV capacitor bank and the like. The three poles G, C, P are kept on the same straight line in the test, the distance from the C pole to the G is 4 to 5 times of the diagonal line D of the transformer substation, the P point is in golden section, in other words, the distance from the G to the P is 0.618 times of the distance between the G and the C. The measurement should avoid river and lake as much as possible and avoid crossing road to prevent the traffic tool from rolling damage to the test line. Meanwhile, the test line should be far away from the underground metal pipeline and the power transmission line in operation so as to avoid electromagnetic interference. For the measurement of the ground impedance of the earth network, the national and industry regulations prescribe that this be done every 6 years.

In summary, since the test point is selected at a place far from the transformer substation, the test wire needs to extend a long distance, and how to extend the wire in a long distance is a technical problem to be solved in the field.

Disclosure of Invention

In view of this, the application provides a ground net impedance test auxiliary device, can assist the long distance extension that realizes the wire, and the wire that auxiliary test was used can extend to the test point department of long distance department.

In a first aspect, the application provides a ground network impedance test auxiliary device, including: a body including a conductor portion, a portion of the conductor portion for insertion into the ground for grounding; the handle is connected with the main body; the wire guide assembly is arranged on the main body and is used for accommodating wires or redirecting the extending direction of the wires; and a wire anti-drop assembly, a first portion of the wire anti-drop assembly being connected to the main body, a second portion of the wire anti-drop assembly extending to a side of the wire guide assembly, the wire anti-drop assembly being configured to prevent the wire from being dropped out of the wire guide assembly.

When the grounding grid impedance testing auxiliary device is used as a grounding iron rod, the grounding grid impedance testing auxiliary device is carried to a testing point outside the transformer substation, the grounding grid impedance testing auxiliary device is inserted into the ground, and the conductor part is grounded. When the grounding grid impedance test auxiliary device is used as a grounding iron rod, the wire with enough length can be wound and stored on the wire guide assembly, and the wire anti-falling assembly can prevent the wire from falling off from the wire guide assembly. After the auxiliary device for testing the impedance of the grounding network is inserted into the ground, the lead is taken down from the lead guide assembly, one end of the lead is electrically connected with the conductor part, and the other end of the lead is carried into a transformer substation and is electrically connected with the power equipment to be tested, so that the grounding test of the power equipment is realized. In the process of carrying the lead to the transformer substation, if the corner is needed to turn, taking one grounding grid impedance testing auxiliary device as a corner iron rod, inserting the grounding grid impedance testing auxiliary device into the soil at the corner, and bypassing the lead guiding assembly by the lead to realize turning. In summary, the long-distance extension of the wires for testing can be assisted, and the wires for assisting testing can be extended to the test points at the long distance. When the corner turns, the wire anti-falling assembly can prevent the wire from falling off the wire guiding assembly. When the auxiliary device for testing the impedance of the grounding grid is used, the handle is convenient for a worker to hold so as to insert the conductor part of the main body into the ground. If frozen or hard soil is encountered, it is difficult for a worker to insert the body into the ground, who can hold one end of the handle and hammer down the top of the handle using a hammer, thereby inserting the body into the ground.

With reference to the first aspect, in one possible implementation manner, the method further includes: and the wiring piece is electrically connected with the conductor part and is used for being electrically connected with a wire.

With reference to the first aspect, in one possible implementation manner, the method further includes: a flat hammering portion provided at a top end of the main body.

With reference to the first aspect, in a possible implementation manner, the handle is provided with a skid-proof element.

With reference to the first aspect, in one possible implementation manner, the number of the wire anti-falling assemblies is at least two, and the second portions of the plurality of wire anti-falling assemblies are distributed at sides of the wire guiding assembly.

With reference to the first aspect, in one possible implementation manner, the method further includes: the pedal piece is connected to the main body.

With reference to the first aspect, in one possible implementation manner, the pedal member includes: a transverse portion vertically connected to the main body; and a vertical portion having a length direction parallel to a length direction of the main body.

With reference to the first aspect, in a possible implementation manner, the bottom end of the vertical portion is a pointed end.

With reference to the first aspect, in one possible implementation manner, the bottom end of the main body is a pointed end.

With reference to the first aspect, in one possible implementation manner, the wire guiding assembly includes: the wire guide shaft comprises a shaft hole, and the shaft hole is sleeved on the main body; the first limiting disc is arranged at the top of the wire shaft; the second limiting disc is arranged at the bottom of the wire shaft; and the limiting piece is fixed on the main body and is positioned below the second limiting disc to support the second limiting disc.

Drawings

Fig. 1 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 3 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 4 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 5 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 6 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 7 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application.

Fig. 8 is a schematic diagram illustrating a detection principle of the ground impedance detection method.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. 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, are intended to be within the scope of the present application.

An exemplary ground network impedance test aid is as follows:

fig. 1 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to an embodiment of the present application. In one embodiment, as shown in fig. 1, the auxiliary device for testing the impedance of the grounding grid comprises a main body 101, a handle 102, a wire guiding assembly 103 and a wire anti-falling assembly 104.

The body 101 includes a conductor portion, a portion of which is for insertion into the ground for grounding. The handle 102 is connected to the main body 101. The wire guide assembly 103 is disposed on the main body 101, and the wire guide assembly 103 is used to receive or redirect the extending direction of the wire. The first portion 1041 of the wire anti-drop assembly 104 is attached to the body 101, and the second portion 1042 of the wire anti-drop assembly 104 extends laterally of the wire guide assembly 103, the wire anti-drop assembly 104 being configured to prevent the wire from being pulled out of the wire guide assembly 104.

When the grounding grid impedance testing auxiliary device is used as a grounding iron rod, the grounding grid impedance testing auxiliary device is carried to a testing point outside the transformer substation, the grounding grid impedance testing auxiliary device is inserted into the ground, and the conductor part is grounded. When the auxiliary device for testing the impedance of the grounding grid is used as a grounding iron rod, a wire with enough length can be wound and stored on the wire guide assembly 103, and the wire falling-off prevention assembly 104 can prevent the wire from falling off from the wire guide assembly 103. After the auxiliary device for testing the impedance of the grounding network is inserted into the ground, the wire is taken down from the wire guide assembly 103, one end of the wire is electrically connected with the conductor part, and the other end of the wire is carried into a transformer substation and is electrically connected with the power equipment to be tested, so that the grounding test of the power equipment is realized.

In the process of carrying the wire to the transformer substation, if the wire needs to turn around a corner, a grounding grid impedance test auxiliary device is used as a corner iron rod, the grounding grid impedance test auxiliary device is inserted into the soil at the corner, and then the wire bypasses the wire guide assembly 103 to achieve turning. When turning around the corner, the wire anti-falling component 104 can prevent the wire from falling off from the wire guiding component 103.

In summary, the long-distance extension of the wires for testing can be assisted, and the wires for assisting testing can be extended to the test points at the long distance.

In use, the ground network impedance test aid is held by the handle 102 for a worker to insert the conductor portion of the body 101 into the ground. If frozen or hard soil is encountered, it is difficult for a worker to insert the body 101 into the soil, who may hold one end of the handle 102 and hammer down the top of the handle 102 using a hammer, thereby inserting the body 101 into the soil.

Fig. 2 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In one embodiment, as shown in fig. 2, the auxiliary device for testing impedance of the grounding network further includes a wire connector 105, wherein the wire connector 105 is electrically connected to the conductor portion of the main body 101, and the wire connector 105 is electrically connected to the wire. When the embodiment is applied, the auxiliary device for testing the impedance of the grounding grid is used as a grounding iron rod, the wiring piece 105 is convenient for the electric connection of wires, and the specific wiring piece 105 can be made into the shape of grounding flat iron.

Fig. 3 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In one embodiment, as shown in fig. 3, the ground plane impedance test assisting apparatus further includes a flat hammering portion 106, and the flat hammering portion 106 is disposed at the top end of the main body 101. In use, when the ground network impedance test aid is difficult to insert into the earth, the handle 102 is held to steady the body 101 so that the body 101 is perpendicular to the ground, and the hammer is used to hammer down the flat hammering portion 106 to insert the body 101 into the earth. Specifically, the flat hammer 106 may be a flat piece of iron that is welded to the top of the handle 102; a portion of the top surface of the handle 102 may also be formed as a flat surface as the flat hammer portion 106.

Fig. 4 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In one embodiment, as shown in FIG. 4, a grip 102 is provided with a non-slip member 1021.

In this embodiment, the anti-slip member 1021 can make the handle 102 easier to hold, and avoid slipping during the holding process.

In one embodiment, as shown in fig. 1, the number of wire anti-drop assemblies 104 is at least two, and the second portions of the plurality of wire anti-drop assemblies 104 are distributed on the side of the wire guiding assembly 103.

In application, the wire can be further prevented from falling off the wire guiding assembly 103 under the protection of the plurality of wire falling-preventing assemblies 104.

Fig. 5 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In one embodiment, as shown in fig. 5, the auxiliary device for testing impedance of the grounding grid further comprises a pedal member 107, wherein the pedal member 107 is connected to the main body 101.

In the present embodiment, the body 101 can be inserted into the soil with assistance of downward force by stepping the pedal 107 when applied.

In one embodiment, as shown in fig. 5, the footrest 107 includes a lateral portion 1071 and a vertical portion 1072. The lateral portion 1071 is vertically connected to the main body 101, and the longitudinal direction of the vertical portion 1072 is parallel to the longitudinal direction of the main body 101.

In this embodiment, the foot may step down on the lateral portion 1071 and the vertical portion 1072 may be inserted into the ground to assist the main body 101 in a more stable supporting effect.

In one embodiment, as shown in FIG. 5, the bottom end of the vertical portion 1072 is pointed to facilitate insertion into the earth.

In one embodiment, as shown in fig. 1 to 5, the bottom end of the main body 101 is pointed, which can be easily inserted into the soil.

Fig. 6 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In one embodiment, as shown in fig. 6, the wire guide assembly 103 includes a wire shaft 1031, a first limit disk 1032, a second limit disk 1033, and a limit 1034.

The wire shaft 1031 includes a shaft hole which is fitted over the main body 101 so that the wire shaft 1031 can be rotated, and the wire shaft 1031 which can be rotated is convenient to receive the wire when the wire is received on the wire shaft 1031. The rotatable wire spool 1031 facilitates wire redirection as it bypasses the wire spool 1031.

The first limit disk 1032 is disposed at the top of the wire shaft 1031, and the second limit disk 1033 is disposed at the bottom of the wire shaft 1031. The limiting member 1034 is fixed on the main body 101, and the limiting member 1034 is located below the second limiting plate 1033 to support the second limiting plate 1033.

In use, the first limit disk 1032 and the second limit disk 1033 are configured to prevent the wires from being pulled out of the wire shaft 1031. When there are too many wires on the wire shaft 1031, the wire falling-preventing assembly 104 can further prevent the wires from falling off the wire shaft 1031.

Fig. 7 is a schematic structural diagram of an auxiliary device for testing impedance of a ground network according to another embodiment of the present application. In some embodiments, as shown in fig. 7, the wire guide assembly 103 further includes a rotating handle 1034 such that the rotating handle 1034 may be held to conveniently rotate the wire shaft 1031 to receive a wire. In particular, the rotational handle 1034 may be provided on either the first limit disk 1032 or the second limit disk 1033.

The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.

The block diagrams of the devices, apparatuses, devices, systems referred to in this application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent to the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An impedance test assisting apparatus for a ground network, comprising:

a body including a conductor portion, a portion of the conductor portion for insertion into the ground for grounding;

the handle is connected with the main body;

the wire guide assembly is arranged on the main body and is used for accommodating wires or redirecting the extending direction of the wires; and

the wire anticreep subassembly, wire anticreep subassembly first part is connected on the main part, wire anticreep subassembly second part extends to wire guide assembly's side, wire anticreep subassembly is constructed to prevent that the wire from deviate from on the wire guide assembly.

2. The ground network impedance test assist device of claim 1 further comprising:

and the wiring piece is electrically connected with the conductor part and is used for being electrically connected with a wire.

3. The ground network impedance test assist device of claim 1 further comprising:

a flat hammering portion provided at a top end of the main body.

4. The device of claim 1, wherein the impedance testing aid comprises,

the handle is provided with an anti-slip piece.

5. The device of claim 1, wherein the impedance testing aid comprises,

the number of the wire anti-falling assemblies is at least two, and the second parts of the plurality of wire anti-falling assemblies are distributed on the side of the wire guiding assembly.

6. The ground network impedance test assist device of claim 1 further comprising:

the pedal piece is connected to the main body.

7. The ground network impedance test assist device of claim 6 wherein the footrest member comprises:

a transverse portion vertically connected to the main body; and

and the length direction of the vertical part is parallel to the length direction of the main body.

8. The device of claim 7, wherein the impedance testing aid comprises,

the bottom end of the vertical part is a pointed end.

9. The device of claim 1, wherein the impedance testing aid comprises,

the bottom end of the main body is a pointed end.

10. A ground network impedance test assist apparatus as recited in any one of claims 1 to 9, wherein said wire guide assembly comprises:

the wire guide shaft comprises a shaft hole, and the shaft hole is sleeved on the main body;

the first limiting disc is arranged at the top of the wire shaft;

the second limiting disc is arranged at the bottom of the wire shaft; and

the limiting piece is fixed on the main body and is positioned below the second limiting disc to support the second limiting disc.

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