CN210665825U - Tower grounding down-leading device convenient for grounding resistance test - Google Patents
Tower grounding down-leading device convenient for grounding resistance test Download PDFInfo
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- CN210665825U CN210665825U CN201921528840.XU CN201921528840U CN210665825U CN 210665825 U CN210665825 U CN 210665825U CN 201921528840 U CN201921528840 U CN 201921528840U CN 210665825 U CN210665825 U CN 210665825U
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Abstract
本实用新型公开了一种便于接地电阻测试的杆塔接地引下装置，有且仅有一根接地引下线通过金属螺栓连接杆塔金属构件与接地装置，由接地装置引出的其他接地引下线通过间隙装置与杆塔金属构件连接。在进行杆塔接地测试过程中，仅需拆除一根接地引下线，明显提高了测试效率。在雷击杆塔时，雷电流通过唯一与杆塔直接连接的接地引下线入地。当杆塔与接地装置失去直接的电气连接时，雷电流在其余接地引下线上的间隙装置上产生的过电压可将间隙击穿，雷电流通过间隙电弧和接地装置入地，保证了接地的可靠性。
The utility model discloses a grounding down-conducting device of a pole and tower which is convenient for grounding resistance testing. There is only one grounding down-conductor which connects the metal component of the tower and the grounding device through metal bolts, and other grounding down-conductors drawn from the grounding device pass through the gap The device is connected with the tower metal component. During the tower grounding test, only one grounding lead needs to be removed, which significantly improves the test efficiency. When lightning strikes the tower, the lightning current enters the ground through the only grounding downconductor directly connected to the tower. When the tower and the grounding device lose the direct electrical connection, the overvoltage generated by the lightning current on the gap device on the remaining grounding downconductors can break down the gap, and the lightning current enters the ground through the gap arc and the grounding device, ensuring the grounding reliability.
Description
Technical Field
The utility model relates to a power equipment technical field, concretely relates to device is drawn to shaft tower ground connection convenient to ground resistance test.
Background
The influence of the numerical value of the grounding resistance on the lightning protection performance of the power transmission line tower is large. In order to reduce the grounding resistance, a special grounding device is generally buried in the soil, and the tower is connected with the grounding device through a grounding down conductor. In order to prevent the grounding down lead from being corroded and broken in soil to influence the grounding effect, the high-voltage transmission line tower adopts a mode that a plurality of grounding down leads are respectively connected with each tower foot metal part.
The tower grounding resistance can change due to natural or artificial reasons, and a regular test needs to be carried out. According to relevant standards in China, a three-pole method or a loop impedance method can be adopted for tower grounding resistance testing. The two testing methods have different principles, but the connection between the grounding down lead and the tower needs to be removed. And each grounding down conductor is fastened on a tower metal component by a bolt, so that the dismounting and recovering of the grounding down conductor are very labor-consuming and time-consuming, and the low testing working efficiency is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome not enough among the prior art, aim at provides a device is drawn down to shaft tower ground connection convenient to ground resistance test, has guaranteed transmission line shaft tower reliable ground connection when thunderbolt promptly, has solved again and has demolishd, has resumeed the problem that ground connection draws down inefficiency in the shaft tower ground resistance test process.
The utility model discloses a following technical scheme realizes:
a tower grounding downlead device convenient for grounding resistance testing comprises a plurality of tower feet of a power transmission line tower, a pre-buried underground grounding device, a plurality of gap devices and a plurality of grounding downleads, wherein the number of the grounding downleads is the same as that of the tower feet of the power transmission line tower; one of the grounding downlead is connected with the tower foot of one of the transmission line towers by bolts, and the other grounding downlead is respectively connected with the tower foot of the transmission line tower through a gap device; the respective ground downleads are electrically connected in turn by insulated wires.
When the technical scheme is used for testing the grounding resistance of the tower, the power frequency or pilot frequency voltage born by the gap is not enough to break down the insulation, so that only the grounding down lead directly connected with the tower is dismounted without dismounting the gap devices of other grounding down leads. When lightning directly strikes the tower, the lightning current can enter the ground through the only grounding down lead directly connected with the tower. If the tower and the grounding device are damaged due to natural or artificial reasons and the electric connection is lost, the gaps can be broken down by overvoltage generated by lightning current on the gap devices on the rest grounding downlead, and the lightning current is arranged into the ground through the gap arc and the grounding device. The clearance distance is set to be very short, so that breakdown under the lightning current is guaranteed on one hand, and the resistance is guaranteed to be very small without influencing the grounding resistance of the tower on the other hand. And the grounding down leads are connected by adopting insulated wires so as to ensure that the tower is connected with a grounding device through other grounding leads after one of the grounding down leads is corroded and broken underground.
Further, the gap device comprises an upper electrode, a lower electrode and an insulating support piece, wherein the insulating support piece is positioned between the upper electrode and the lower electrode, and the upper electrode and the lower electrode are connected through an insulating bolt.
The upper electrode that sets up is used for being connected with ground lead, and the lower electrode that sets up is used for being connected with the tower foot of transmission line shaft tower to under insulating support piece's effect, guarantee to have certain clearance between upper electrode and the lower electrode, utilize insulating bolt to link together the three, guarantee that the gap device has stable joint strength.
Furthermore, the upper electrode comprises a flat plate and a side plate, one end of the side plate is obliquely connected with the side wall of the flat plate, and the other end of the side plate is turned over towards the direction far away from the lower electrode to form an L-shaped structure.
Because the upper electrode comprises a flat plate and a side plate, the bottom of the flat plate and the top of the insulating support piece are both flat rectangles, a stable contact surface is ensured to be arranged between the upper electrode and the insulating support piece, the side plate is connected to one side surface of the flat plate, the side plate is obliquely connected with the flat plate towards the direction of the lower electrode, and the side plate is bent and extended towards the direction of the lower electrode in principle to form an L-shaped structure, so that a certain gap is formed between the inflection part of the side plate and the lower electrode.
Further, a second reserved screw hole is formed in the flat plate of the upper electrode, a second metal bolt is arranged in the second reserved screw hole, and the second metal bolt can be connected with the grounding down lead.
Furthermore, the lower electrode is of a structure like a Chinese character 'ji', the protruding portion of the lower electrode is in contact with the insulating support piece, first reserved screw holes are formed in two sides of the lower electrode, first metal bolts are arranged in the first reserved screw holes, and the first metal bolts can be connected with tower feet of the power transmission line tower.
Further, the insulating bolt comprises a screw and a nut, wherein the screw penetrates through the flat plate and the insulating support in sequence, extends into the convex part of the lower electrode and is connected with the nut.
Further, the minimum distance between the upper electrode and the lower electrode is 3mm-5 mm.
Furthermore, the upper electrode and the lower electrode are made of metal materials, and the insulating support piece is made of insulating materials.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to a shaft tower ground lead-down device convenient to ground resistance test, because only one ground lead-down wire is directly connected with the shaft tower metal component, only one ground lead-down wire needs to be dismantled when the ground resistance test is carried out, thereby obviously reducing the working procedures and improving the efficiency;
2. the utility model relates to a device is drawn down to shaft tower ground connection convenient to ground resistance test, the clearance device of setting can lose for the lightning current provides the earial drainage passageway under the condition of electrical connection at shaft tower and earthing device, has guaranteed the reliability of shaft tower ground connection.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the electrical connection of the structure of the present invention;
fig. 2 is a front view of the gap means of the present invention;
fig. 3 is a side view of the gap means of the present invention;
fig. 4 is a top view of the gap device of the present invention.
Reference numbers and corresponding part names in the drawings:
1-upper electrode, 2-lower electrode, 3-insulating support member, 4-first reserved screw hole, 5-second reserved screw hole, 6-screw rod, 7-screw cap, 8-tower foot, 9-gap device, 10-grounding down lead, 11-insulating lead and 12-grounding device.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in fig. 1 to 4, the utility model relates to a tower grounding downlead device convenient to ground resistance test, which comprises a plurality of tower legs 8 of the transmission line tower and a pre-buried underground grounding device 12, wherein the grounding device 12 is provided with a plurality of grounding downleads 10 with the same number as the tower legs 8 of the transmission line tower, and also comprises a plurality of gap devices 9; one of the grounding downleads 10 is connected with the tower foot 8 of one of the power transmission line towers by bolts, and the other grounding downleads 10 are respectively connected with the tower foot 8 of the power transmission line tower through a gap device 9; the respective ground down wires 10 are electrically connected in turn by insulated conductive wires 11.
Example 2
On the basis of embodiment 1, the gap device 9 comprises an upper electrode 1, a lower electrode 2 and an insulating support 3, wherein the insulating support 3 is positioned between the upper electrode 1 and the lower electrode 2, and the upper electrode 1 and the lower electrode 2 are connected through an insulating bolt.
Further, the upper electrode 1 comprises a flat plate and a side plate, one end of the side plate is obliquely connected with the side wall of the flat plate, and the other end of the side plate is turned over towards the direction far away from the lower electrode 2 to form an L-shaped structure.
Further, a second reserved screw hole 5 is formed in the flat plate of the upper electrode 1, a second metal bolt is arranged in the second reserved screw hole 5, and the second metal bolt can be connected with the grounding down lead 10.
Further, lower electrode 2 is the structure of nearly word, and the bulge and the insulating support piece 3 contact of lower electrode 2, and the both sides of lower electrode are equipped with first reservation screw 4, are equipped with first metal bolt in the first reservation screw 4 to first metal bolt can be connected with the tower foot 8 of transmission line shaft tower.
Further, the insulating bolt comprises a screw 6 and a nut 7, wherein the screw 6 sequentially penetrates through the flat plate and the insulating support 3, extends into the convex part of the lower electrode, and is connected with the nut.
Further, the minimum distance between the upper electrode 1 and the lower electrode 2 is 3mm-5 mm.
Furthermore, the upper electrode 1 and the lower electrode 2 are made of metal, and the insulating support 3 is made of insulating material.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A tower grounding down-leading device convenient for grounding resistance testing comprises a plurality of tower feet (8) of transmission line towers and an underground pre-buried grounding device (12), wherein the grounding device (12) is provided with a plurality of grounding down-leading lines (10) with the same number as the tower feet (8) of the transmission line towers, and is characterized by further comprising a plurality of gap devices (9);
one of the grounding down-lead (10) is connected with the tower foot (8) of one of the transmission line towers by bolts, and the other grounding down-lead (10) is respectively connected with the tower foot (8) of the transmission line tower through a gap device (9);
the respective ground down leads (10) are electrically connected in sequence by insulated conductive wires (11).
2. The tower grounding down-lead device convenient for the ground resistance test is characterized in that the gap device (9) comprises an upper electrode (1), a lower electrode (2) and an insulating support member (3), the insulating support member (3) is positioned between the upper electrode (1) and the lower electrode (2), and the upper electrode (1) is connected with the lower electrode (2) through an insulating bolt.
3. The tower grounding down-leading device convenient for the grounding resistance test according to claim 2, wherein the upper electrode (1) comprises a flat plate and a side plate, one end of the side plate is obliquely connected with the side wall of the flat plate, and the other end of the side plate is turned over towards the direction far away from the lower electrode (2) to form an L-shaped structure.
4. The tower grounding down-lead device convenient for the grounding resistance test is characterized in that a second reserved screw hole (5) is formed in the flat plate of the upper electrode (1), a second metal bolt is arranged in the second reserved screw hole (5), and the second metal bolt can be connected with a grounding down-lead (10).
5. The tower grounding down-leading device convenient for grounding resistance testing according to claim 3, characterized in that the lower electrode (2) is of a structure like a Chinese character 'ji', a protruding part of the lower electrode (2) is in contact with the insulating support member (3), first reserved screw holes (4) are arranged on two sides of the lower electrode, first metal bolts are arranged in the first reserved screw holes (4), and the first metal bolts can be connected with tower feet (8) of the power transmission line tower.
6. The tower grounding down-leading device convenient for the grounding resistance test according to claim 5, wherein the insulation bolt comprises a screw rod (6) and a nut (7), the screw rod (6) penetrates through the flat plate and the insulation support member (3) in sequence, extends into the convex part of the lower electrode and is connected with the nut.
7. The tower grounding down-lead device convenient for the grounding resistance test according to claim 2, wherein the minimum distance between the upper electrode (1) and the lower electrode (2) is 3mm-5 mm.
8. The tower grounding down-leading device convenient for the grounding resistance test according to claim 2, wherein the upper electrode (1) and the lower electrode (2) are made of metal, and the insulating support member (3) is made of insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921528840.XU CN210665825U (en) | 2019-09-12 | 2019-09-12 | Tower grounding down-leading device convenient for grounding resistance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921528840.XU CN210665825U (en) | 2019-09-12 | 2019-09-12 | Tower grounding down-leading device convenient for grounding resistance test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210665825U true CN210665825U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921528840.XU Active CN210665825U (en) | 2019-09-12 | 2019-09-12 | Tower grounding down-leading device convenient for grounding resistance test |
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| Country | Link |
|---|---|
| CN (1) | CN210665825U (en) |
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2019
- 2019-09-12 CN CN201921528840.XU patent/CN210665825U/en active Active
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