CN209418790U - Graphite-based leakage ground electrode - Google Patents

Abstract

The utility model relates to a graphite-based leakage grounding electrode. The graphite-based leakage grounding electrode includes an impact head, a tubular graphite-based flexible grounding electrode and a supporting inner core. The lower end of the tubular graphite-based flexible grounding electrode is connected to the impact head, and the supporting inner core is installed in the tubular graphite-based flexible grounding electrode near the lower end. , the tubular graphite-based flexible grounding electrode is also filled with resistance-reducing materials, and the outer side of the tubular graphite-based flexible grounding electrode is surrounded by more than two metal leakage grounding electrodes extending up and down. The lower end of the metal leakage grounding electrode is connected to the impact head , the upper end is electrically connected with the tubular graphite-based flexible ground electrode. The upper end of the metal leakage grounding electrode is electrically connected to the tubular graphite-based flexible grounding electrode. After the lower end is connected to the impact head, the metal leakage grounding electrode is connected in parallel with the tubular graphite-based flexible grounding electrode, so that the leakage grounding electrode has good soil wettability. characteristics while reducing the overall resistance of the leakage grounding electrode.

Description

Graphite-based leakage ground electrode

technical field

The utility model relates to a graphite-based leakage grounding electrode.

Background technique

The grounding system is an important part of the power system. It is responsible for connecting electrical equipment to the earth. It consists of grounding down conductors and the main body of the grounding grid. When a thunderstorm occurs, the lightning current first flows through the tower, and then is grounded through the grounding down conductor connected to the tower. Therefore, the grounding down conductor provides a lightning current leakage channel, avoiding the line tripping accident caused by lightning, and reducing the grounding resistance of the transmission line is the key work to prevent the lightning tripping accident and protect the safe operation of the transmission line. The main factors affecting the grounding resistance are the resistivity of the grounding soil, the selection of the artificial grounding body, the design of the grounding device, and the construction process and method.

In electrical engineering, most of the existing grounding poles use 2.5m long, 45×45mm galvanized angle steel, which are nailed to the bottom of a trench with a depth of 800mm, and then lead out with lead wires. In addition to galvanized angle steel, existing ground electrodes often use galvanized round steel or galvanized angle iron with a diameter of 2 cm. The resistance of the metal grounding electrode itself is small, but there is a large resistivity between the metal grounding electrode and the soil, which makes the grounding effect not ideal.

The Chinese utility model patent with the authorized announcement number CN208315786U and the authorized announcement date of 2019.01.01 discloses a quick-installable flexible graphite ion grounding electrode, which includes a grounding head (that is, an impact head), a supporting inner core (that is, a supporting inner core) Core), resistance reducing tube and flexible graphite braided sleeve (i.e. tubular graphite-based flexible grounding electrode), one end of the ground head is a tapered structure, the other end is a circular pipe structure, and the end of the supporting inner core is inserted into the circular pipe structure of the ground head. One end is compressed and connected with the resistance reducing tube, and the flexible graphite braided sleeve is set on the outer side of the support inner core and the resistance reducing tube. When installing, first insert the power rod into the inside of the resistance reducing tube to smash the grounding electrode into the ground, then pull out the power rod and fill the resistance reducing tube with graphite ion resistance reducing material. This graphite grounding electrode has the characteristics of good soil wettability, but its own resistance is relatively large, and its ability to withstand large currents is poor.

Utility model content

The purpose of the utility model is to provide a graphite-based leakage grounding electrode with good corrosion resistance and low self-resistance.

In order to achieve the above object, the technical scheme of the graphite-based leakage grounding electrode of the present utility model is:

A graphite-based leakage grounding electrode, including an impact head, a tubular graphite-based flexible grounding electrode and a supporting inner core, the lower end of the tubular graphite-based flexible grounding electrode is connected to the impact head, and the supporting inner core is installed in the tubular graphite-based flexible grounding electrode near the lower end position, the tubular graphite-based flexible grounding electrode is also filled with resistance-reducing materials, and there are more than two metal leakage grounding electrodes extending up and down around the outer side of the tubular graphite-based flexible grounding electrode. The head is connected, and the upper end is electrically connected with the tubular graphite-based flexible ground electrode.

The beneficial effects of the utility model are: the graphite-based grounding electrode in the utility model is surrounded by a metal leakage grounding electrode on the outside of the tubular graphite-based flexible grounding electrode, and the upper end of the metal leakage grounding electrode is connected with the tubular graphite-based flexible grounding electrode. Electrical connection, due to the low resistance of the metal leakage grounding electrode, the leakage capacity of the leakage grounding electrode is enhanced. After the lower end of the metal leakage grounding electrode is connected to the impact head, the metal leakage grounding electrode is connected in parallel with the tubular graphite-based flexible grounding electrode , so that the leakage grounding electrode has the characteristics of good soil wettability and at the same time reduces the overall resistance of the leakage grounding electrode.

Further, the outer side of the tubular graphite-based flexible ground electrode close to the upper end is covered with a metal sleeve, and the upper end of each metal leakage ground electrode is connected to the metal sleeve to realize electrical connection with the tubular graphite-based flexible ground electrode. The metal pipe sleeve facilitates conductive assembly of each metal leakage grounding electrode and the tubular graphite-based flexible grounding electrode.

Furthermore, the metal leakage grounding electrode and the tubular graphite-based flexible grounding electrode are arranged at intervals in the radial direction, which can expand the spark effect, increase the conductivity of the soil, and reduce the contact resistance.

Further, the metal leakage ground is extremely rod-shaped. The rod-shaped structure reduces the resistance when the metal leakage ground electrode enters the ground.

Further, the metal leakage grounding pole is a copper rod or a steel rod or an aluminum rod, and the resistance of the copper rod, the steel rod and the aluminum rod is relatively small.

Further, an inner metal leakage electrode is inserted on the inner side of the tubular graphite-based flexible ground electrode close to the upper end, the lower end of the inner metal leakage electrode is inserted into the resistance-reducing material, and the upper end is connected to the tubular graphite-based flexible ground electrode. The inner metal discharge electrode is connected to the resistance-reducing material and the tubular graphite-based flexible ground electrode, and then connected to the ground cable on the ground, which can reduce the resistance between the ground cable and the discharge ground electrode.

Further, the inner metal leakage electrode is a strip-like structure. The elongated plate structure can increase the contact area between the inner metal leakage electrode and the resistance reducing material, and reduce the contact resistance between the inner metal leakage electrode and the resistance reducing material.

Further, the tubular graphite-based flexible ground electrode is also equipped with a resistance reducing tube near the lower section, and the pipe wall of the resistance reducing pipe is provided with a plurality of overflow holes passing through the pipe wall for the flow of the resistance reducing material inside. The internal resistance reducing material of the resistance reducing pipe can overflow and diffuse into the nearby soil through the overflow hole, so as to improve the conductive effect between the ground electrode and the soil.

Description of drawings

Fig. 1 is the structural representation of inserting the power rod in the graphite-based flexible grounding electrode in the specific embodiment of the graphite-based leakage grounding electrode of the present utility model;

Fig. 2 is the structural schematic diagram of filling the resistance-reducing material in the graphite-based flexible grounding electrode in the specific embodiment of the graphite-based leakage grounding electrode of the present invention;

Fig. 3 is the top view of Fig. 2;

Description of reference signs: 1-impact head; 2-supporting inner core; 3-resistance reducing tube; 4-overflow hole; 5-tubular graphite-based flexible grounding electrode; 6-metal leakage grounding electrode; 7-resistance reducing material ; 8-metal sleeve; 9-inner metal leakage electrode; 10-power rod.

Detailed ways

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

The specific embodiment of the graphite-based leakage grounding electrode of the present utility model is shown in Fig. 1 to Fig. 2. Core 2. The impact head 1 has a conical structure at one end and a circular tube structure at the other end. The circular tube structure of the impact head 1 is embedded with a tubular graphite-based flexible ground electrode 5, and the tubular graphite-based flexible ground electrode 5 is also equipped with a supporting inner core 2 and a drop-down electrode. The resistance tube 3, the support inner core 2 and the resistance reducing tube 3 are compressed and connected together by a shrink tube compressor. The resistance reducing tube 3 is located near the lower end of the tubular graphite-based flexible ground electrode 5, and the tubular graphite-based flexible ground electrode 5 is also Filled with resistance reducing material 7. In this embodiment, the tubular graphite-based flexible grounding electrode 5 is a flexible graphite braided sleeve. The pipe wall of the resistance reducing pipe 3 is provided with a plurality of overflow holes 4 passing through the pipe wall. The resistance reducing material 7 inside the resistance reducing pipe 3 can be The overflow diffuses into the nearby soil through the overflow hole 4 and the tubular graphite-based flexible grounding electrode 5, improving the conductive effect between the leakage grounding electrode and the soil.

As shown in FIG. 2 to FIG. 3 , in order to reduce the overall resistance of the graphite-based drain ground electrode, a plurality of metal drain ground electrodes 6 extending in the vertical direction are arranged around the outside of the tubular graphite-based flexible ground electrode 5 . Specifically, in this embodiment, the metal leakage grounding electrode 6 is composed of a copper rod, and a metal sleeve 8 is set outside the position near the upper end of the tubular graphite-based flexible grounding electrode 5, and the upper and lower ends of the copper rod are bent. Welded on the metal sleeve 8 and the impact head 1 respectively. The leakage grounding electrode of this embodiment connects the metal leakage grounding electrode 6 with the metal sleeve 8 and the impact head 1, so that the metal leakage grounding electrode 6 and the tubular graphite-based flexible grounding electrode 5 are connected in parallel, reducing the leakage grounding electrode. The overall resistance, but also has the characteristics of good soil wettability. Of course, in other embodiments, the metal leakage grounding electrode may also use an aluminum rod or a steel rod. The metal discharge ground electrode 6 adopts a rod-shaped structure to reduce the resistance when the discharge ground electrode enters the ground. Of course, in other embodiments, the metal discharge ground electrode can also be a copper plate, which is radially welded on the metal sleeve and the impact head. superior. In other embodiments, the metal drain ground electrode may also be a tubular structure sleeved on the outside of the tubular graphite-based flexible ground electrode, and welded to the outside of the metal sleeve and the impact head through a connecting rod. In other embodiments, the upper end of the tubular graphite-based flexible ground electrode may no longer be provided with a metal sleeve, but an arc-shaped conductive sheet is arranged on the upper end of the metal leakage ground electrode to stick on the tubular graphite-based flexible ground electrode.

In other embodiments, it is also possible to first weld each metal leakage grounding electrode to two metal pipe sleeves arranged at intervals, and then put the welded overall sleeve on the outside of the tubular graphite-based flexible grounding electrode and the impact head, and pass the two The two metal sleeves are respectively conductively connected with the tubular graphite-based flexible ground electrode and the impact head to realize the parallel arrangement of the metal leakage ground electrode and the tubular graphite flexible ground electrode.

In this embodiment, the two ends of the copper rod are bent to form a connecting part and then welded on the metal sleeve and the impact head, so that the part forming the metal leakage grounding electrode 6 between the two connecting parts is spaced from the tubular graphite-based flexible grounding electrode 5 Arrangement, this setting can expand the spark effect, increase the conductivity of the soil, and reduce the contact resistance. In other embodiments, it is also possible to directly weld one end of the copper rod constituting the metal drain ground electrode to the metal pipe sleeve, and weld the other end to the impact head.

An inner metal leakage electrode 9 is inserted on the inner side of the tubular graphite-based flexible ground electrode 5 close to the upper end. The inner metal drain electrode 9 is connected to the resistance-reducing material 7 and the tubular graphite-based flexible ground electrode 5 and then connected to the ground cable on the ground to reduce the resistance between the ground cable and the drain ground electrode. The inner metal leakage electrode 9 is a strip-shaped structure, which can increase the contact area between the inner metal leakage electrode 9 and the resistance reducing material 7, and reduce the contact area between the inner metal leakage electrode 9 and the resistance reducing material 7. Contact resistance. In other embodiments, the inner metal leakage electrode can also be a round rod structure. In other embodiments, the inner metal drain electrode may not be provided any more.

As shown in Figures 1 and 2, during installation, the power rod 10 is first inserted into the resistance reducing tube 3 and is in contact with the supporting inner core 2, and the head end of the tubular graphite-based flexible grounding electrode 5 is clamped on the supporting inner core 2 between the other end of the impact head 1 and the round pipe end of the impact head 1, and then use a sledgehammer to hit the power rod 10 to smash the tapered end of the impact head 1 into the soil until the appropriate depth, and then smash the tapered end of the impact head 1 into the soil During the process, the metal leakage grounding electrode 6, the resistance reducing tube 3 and the tubular graphite-based flexible grounding electrode 5 are all buried in the soil, and then the power rod 10 is pulled out with a pipe wrench, and the resistance reducing material 7 is directly injected through a glue gun. In the resistance reducing tube 3, the inner metal leakage electrode 9 is finally inserted into the resistance reducing material 7, and the upper end of the tubular graphite-based flexible grounding electrode 5 is closed until it contacts the inner metal leakage electrode 9. The resistance-reducing material 7 in this embodiment is a low-temperature expandable resistance-reducing material. After the leakage ground electrode is buried in the soil, the low-temperature expandable graphite contained in the resistance-reducing material 7 will slowly expand, making the entire resistance-reducing material The volume of 7 increases, and the contact between the resistance reducing material 7 and the inner metal discharge electrode 9 is reduced, and the contact resistance is reduced. At the same time, with the increase in volume and the pressure of the settlement of the external soil, the metal sleeve 8 and the tubular graphite base are flexible. The contact between the ground electrodes 5 is closer and the contact resistance is lower.

Claims (8)

1. graphite-based aerial drainage earthing pole, including impact head, tubular graphene base flexible grounding electrode and support inner core, tubular graphene base The lower end of flexible grounding electrode connects impact head, and support inner core is mounted in tubular graphene base flexible grounding electrode close to lower end position Locate, be also filled with resistance-lowering material in tubular graphene base flexible grounding electrode, it is characterised in that: on the outside of tubular graphene base flexible grounding electrode Also connect around the metal aerial drainage earthing pole for being disposed with two or more or more extension, the lower end of metal aerial drainage earthing pole and impact head It connects, upper end and tubular graphene base flexible grounding electrode are electrically connected.

2. graphite-based aerial drainage earthing pole according to claim 1, it is characterised in that: tubular graphene base flexible grounding electrode is close The outer sheath of upper end position is equipped with metal pipe sleeve, and the upper end of each metal aerial drainage earthing pole connect with metal pipe sleeve and realizes and tubulose The electric connection of graphite-based flexible grounding electrode.

3. graphite-based aerial drainage earthing pole according to claim 1 or 2, it is characterised in that: metal aerial drainage earthing pole and tubulose Graphite-based flexible grounding electrode arranged for interval radially.

4. graphite-based aerial drainage earthing pole according to claim 1 or 2, it is characterised in that: metal aerial drainage ground connection is extremely rod-shaped Structure.

5. graphite-based aerial drainage earthing pole according to claim 4, it is characterised in that: metal aerial drainage ground connection extremely copper bar or steel Bar or aluminium bar.

6. graphite-based aerial drainage earthing pole according to claim 1 or 2, it is characterised in that: tubular graphene base flexible grounding electrode Inside interior metal aerial drainage electrode is also fitted with close to upper end position, the lower end of interior metal aerial drainage electrode is inserted in resistance-lowering material, Upper end is connect with tubular graphene base flexible grounding electrode.

7. graphite-based aerial drainage earthing pole according to claim 6, it is characterised in that: interior metal aerial drainage electrode is long strip-board shape Structure.

8. graphite-based aerial drainage earthing pole according to claim 1 or 2, it is characterised in that: tubular graphene base flexible grounding electrode Interior to be also equipped with drop resistance pipe close to lower fragment position, the tube wall of drop resistance pipe is equipped with multiple perforation tube walls for the resistance-lowering material in it The overflow hole of outflow.