阅读说明：本技术 电力井防漏电接地保护方法 (Anti-creeping grounding protection method for electric power well ) 是由 黄帅 栗明欣 刘杨 于 2021-07-14 设计创作，主要内容包括：本发明公开了一种电力井防漏电接地保护方法,包括：在砌筑电力井的井室时,沿电缆管道延伸方向两侧的井室墙壁上各安装至少两预埋钢板；在电力井的井室砌筑完成后,于该电力井外的四个角各打入一接地极；沿电力井的井室内壁设置一圈内接地线,所述内接地线连接至各预埋钢板；在电力井的外围设置一圈外接地带,所述外接地带连接至所述接地极；在电力井的井室内安装用以架设所述电缆管道的电缆支架,所述电缆支架的上部连接至所述内接地线,所述电缆支架的下部固定于井室的内壁；将各预埋钢板分别通过一连接带连接至所述外接地带,以使所述内接地线与所述外接地带连接为一体。本发明可以避免因电力井内的电缆漏电而危及人身安全。(The invention discloses an anti-creeping grounding protection method for a power well, which comprises the following steps: when a well chamber of the electric power well is built, at least two embedded steel plates are respectively installed on the well chamber walls on two sides in the extension direction of the cable pipeline; after the well chamber of the electric power well is built, driving a grounding electrode into each of four corners outside the electric power well; arranging a circle of internal grounding wires along the inner wall of a well chamber of the power well, wherein the internal grounding wires are connected to the embedded steel plates; arranging a circle of external connection zone at the periphery of the power well, wherein the external connection zone is connected to the grounding electrode; installing a cable bracket for erecting the cable pipeline in a well chamber of the power well, wherein the upper part of the cable bracket is connected to the internal grounding wire, and the lower part of the cable bracket is fixed on the inner wall of the well chamber; and connecting each embedded steel plate to the external connection zone through a connecting belt respectively so as to connect the internal grounding wire and the external connection zone into a whole. The invention can avoid the personal safety from being endangered by the electric leakage of the cable in the power well.)

1. An anti-creeping grounding protection method for an electric power well is characterized by comprising the following steps:

when a well chamber of the electric power well is built, at least two embedded steel plates are respectively installed on the well chamber walls on two sides in the extension direction of the cable pipeline;

after the well chamber of the electric power well is built, driving a grounding electrode into each of four corners outside the electric power well;

arranging a circle of internal grounding wires along the inner wall of a well chamber of the power well, wherein the internal grounding wires are connected to the embedded steel plates;

arranging a circle of external connection zone at the periphery of the power well, wherein the external connection zone is connected to the grounding electrode;

installing a cable bracket for erecting the cable pipeline in a well chamber of the power well, wherein the upper part of the cable bracket is connected to the internal grounding wire, and the lower part of the cable bracket is fixed on the inner wall of the well chamber;

connecting each embedded steel plate to the external connection zone through a connecting belt respectively so as to connect the internal grounding wire and the external connection zone into a whole;

the method comprises the steps of detecting the grounding resistance of a centralized grounding device in the electric well, and if the grounding resistance is larger than a target threshold value, additionally arranging a grounding electrode outside the electric well until the grounding resistance is smaller than or equal to the target threshold value.

2. The electric power well anti-creeping ground protection method according to claim 1, wherein the pre-buried steel plate comprises a first steel plate, a second steel plate and two round bars, the first steel plate and the second steel plate are respectively welded to two ends of the round bars, and the first steel plate is fixed to the well chamber wall and connected to the external connection zone through the connection belt; the second steel plate is connected to the inner ground wire.

3. An anti-creeping grounding protection method for an electric power well according to claim 1, wherein the distance between the grounding electrode and the electric power well is 300mm or more.

4. The electric power well anti-creeping grounding protection method according to claim 1, wherein the grounding electrode is galvanized angle steel.

5. An anti-creeping grounding protection method for an electric power well according to claim 1, wherein the inner ground wire and the outer zone are each formed by a plurality of flat steels connected end to end.

6. An anti-creeping grounding protection method for an electric power well according to claim 1, wherein the cable holder is provided with an anti-slipping projection for preventing the cable from falling off.

7. An anti-creeping ground protection method for an electric power well according to claim 1, wherein the upper part of the cable holder is welded to the internal ground wire, and the lower part of the cable holder is fixed to the inner wall of the well by means of expansion bolts.

8. The electric well anti-creeping grounding protection method according to claim 1, further comprising, after the well chamber of the electric well is built:

and (4) plastering the inside and the outside of the electric power well by adopting waterproof mortar to prevent water leakage in a well chamber of the electric power well.

Technical Field

The invention relates to the technical field of municipal power construction, in particular to an anti-creeping grounding protection method for a power well.

Background

Municipal works generally relate to national infrastructure, and refer to infrastructure construction of various public transport facilities, water supply, drainage, gas, urban flood control, environmental sanitation, lighting, electric power and the like in urban construction. Municipal engineering is an essential material basis for urban survival and development, and is a basic condition for improving the living standard of people and opening the environment. In urban and residential areas, high-rise buildings, factory areas or other places with corrosive gases, flammability and explosiveness, cable duct bank design is needed when overhead lines are not suitable to be erected or even some places are not specified accurately in consideration of safety, urban appearance and aesthetic problems and geographical position limitation.

When alternating current is passed through the conductor of cable, not only produce induced voltage to cable metal covering shielding layer, also can produce induced charge on the metal object of laying along the cable. When the metal shell of the cable is electrified due to insulation damage or other accidents in the power well, the possibility that the personal safety is endangered due to the fact that strong current passes through the human body exists, and therefore anti-creeping grounding protection needs to be carried out on the power well.

Disclosure of Invention

Aiming at the technical problems, the invention provides an anti-creeping grounding protection method for a power well, which is used for avoiding the personal safety from being endangered due to the electric leakage of a cable in the power well.

In order to achieve the purpose, the invention provides the following technical scheme:

an anti-creeping grounding protection method for an electric power well comprises the following steps:

when a well chamber of the electric power well is built, at least two embedded steel plates are respectively installed on the well chamber walls on two sides in the extension direction of the cable pipeline;

after the well chamber of the electric power well is built, driving a grounding electrode into each of four corners outside the electric power well;

arranging a circle of internal grounding wires along the inner wall of a well chamber of the power well, wherein the internal grounding wires are connected to the embedded steel plates;

arranging a circle of external connection zone at the periphery of the power well, wherein the external connection zone is connected to the grounding electrode;

installing a cable bracket for erecting the cable pipeline in a well chamber of the power well, wherein the upper part of the cable bracket is connected to the internal grounding wire, and the lower part of the cable bracket is fixed on the inner wall of the well chamber;

connecting each embedded steel plate to the external connection zone through a connecting belt respectively so as to connect the internal grounding wire and the external connection zone into a whole;

the method comprises the steps of detecting the grounding resistance of a centralized grounding device in the electric well, and if the grounding resistance is larger than a target threshold value, additionally arranging a grounding electrode outside the electric well until the grounding resistance is smaller than or equal to the target threshold value.

In an embodiment of the present invention, the embedded steel plate includes a first steel plate, a second steel plate and two round bars, the first steel plate and the second steel plate are respectively welded to two ends of the round bars, and the first steel plate is fixed to the wall of the well and connected to the external connection zone through the connection belt; the second steel plate is connected to the inner ground wire.

In an embodiment of the present invention, a distance between the ground electrode and the power well is greater than or equal to 300 mm.

In an embodiment of the present invention, the ground electrode is made of galvanized angle steel.

In an embodiment of the present invention, the inner ground wire and the outer land are each formed of a plurality of flat steels connected end to end.

In an embodiment of the present invention, the cable holder is provided with an anti-slip protrusion for preventing the cable from falling off.

In an embodiment of the present invention, an upper portion of the cable holder is welded to the internal ground wire, and a lower portion of the cable holder is fixed to an inner wall of the well by using an expansion bolt.

In an embodiment of the present invention, after the well chamber of the electric power well is built, the method further includes:

and (4) plastering the inside and the outside of the electric power well by adopting waterproof mortar to prevent water leakage in a well chamber of the electric power well.

The electric power well anti-creeping grounding protection method provided by the invention can avoid the personal safety from being endangered due to the electric leakage of the cable in the electric power well.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a process flow diagram of the earth leakage protection method for an electric power well according to the present invention;

FIG. 2 is a schematic diagram of an embodiment of the earth leakage protection method for an electric power well according to the present invention;

FIG. 3 is a top view of FIG. 2; and

FIG. 4 is a schematic cross-sectional view of an embedded steel plate according to the present invention.

Reference numerals

1 well chamber

2 Pre-buried steel plate

21 first steel plate

22 second steel plate

23 round steel

3 internal grounding wire

4 Cable support

5 connecting belt

6 grounding electrode

7 external connection zone

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. FIG. 1 is a process flow diagram of the earth leakage protection method for an electric power well according to the present invention; FIG. 2 is a schematic diagram of an embodiment of the earth leakage protection method for an electric power well according to the present invention; FIG. 3 is a top view of FIG. 2; and FIG. 4 is a schematic cross-sectional view of the pre-buried steel plate according to the present invention. As shown in fig. 1, the invention discloses an anti-creeping grounding protection method for an electric power well, which comprises the following steps:

and S1, when the well chamber 1 of the electric power well is built, at least two embedded steel plates 2 are respectively installed on the walls of the well chamber 1 at two sides along the extension direction of the cable duct.

Specifically, as shown in fig. 4, the embedded steel plate 2 may include a first steel plate 21, a second steel plate 22 and two round bars 23, the first steel plate 21 and the second steel plate 22 are respectively welded to two ends of the round bars 23, and the first steel plate 21 is fixed to the wall of the well 1. Further, the embedded steel plate 2 can be formed by connecting two 100x100x6mm steel plates and two 8mm round steel 23 through welding. When the electric well room 1 is built, two embedded steel plates 2 are respectively installed on the walls of the electric well room 1 on two sides along the cable pipeline direction, and the installation height can be 20cm below the well cover plate.

And S2, driving a grounding electrode 6 into each of the four corners outside the electric well after the well chamber 1 of the electric well is built.

Specifically, the distance between the ground electrode 6 and the power well is preferably 300mm or more. The grounding electrode 6 is made of galvanized angle steel. Furthermore, after the well chamber 1 is built, waterproof mortar can be used for plastering the inside and the outside of the electric power well, and the thickness of the plastering mortar can be 20mm, so that water leakage can be prevented. And respectively driving a grounding electrode 6 into four corners outside the power well, wherein the grounding electrode 6 is made of galvanized angle steel which is less than 50 multiplied by 5mm, and the length can be 2.5 m.

And S3, arranging a circle of internal grounding wires 3 along the inner wall of the well chamber 1 of the power well, wherein the internal grounding wires 3 are connected to the embedded steel plates 2.

Specifically, the inner ground wire 3 is connected to the second steel plate 22. The inner earth wire 3 may be formed of a plurality of flat steels connected end to end. Furthermore, the internal grounding wire 3 can be flat steel with the width of 25mm and the thickness of 4mm, a circle of internal grounding wire 3 is installed inside the electric well along the inner wall of the well chamber 1, and the internal grounding wire 3 is welded on the second steel plate 22 of the embedded steel plate 2 inside the electric well chamber 1.

And S4, arranging a circle of external connection zone 7 at the periphery of the power well, wherein the external connection zone 7 is connected to the grounding electrode 6.

Specifically, the circumscribed area 7 is formed by a plurality of flat steels connected end to end. Further, the external connection zone 7 can be flat steel with the width of 25mm and the thickness of 4mm, and the external connection zone 7 is welded on the grounding electrodes 6 at four corners outside the power well, so that the grounding electrode forms a whole in a circle and is connected end to end.

And S5, installing a cable support 4 for erecting the cable pipeline in the well chamber 1 of the power well, wherein the upper part of the cable support 4 is connected to the inner grounding wire 3, and the lower part of the cable support 4 is fixed on the inner wall of the well chamber 1.

Specifically, the cable holder 4 may be provided with an anti-slip protrusion to prevent the cable from falling off. The upper part of the cable support 4 is welded and fixed with the internal grounding wire 3, and the lower part of the cable support 4 is fixed on the inner wall of the well chamber 1 by adopting an expansion bolt. Furthermore, the cable holder 4 can be welded by using two types of angle steel of L50x5mm and L30x4 mm.

And S6, connecting each embedded steel plate 2 to the external connection zone 7 through a connecting belt 5 respectively, so that the internal grounding wire 3 and the external connection zone 7 are connected into a whole.

Specifically, the first steel plate 21 of each embedded steel plate 2 is connected to the circumscribed area 7 through the connection band 5. The connecting strip 5 may be a flat steel strip 25mm wide and 4mm thick, so that the internal ground wire 3 and the external connection zone 7 may be connected to form a whole.

And S7, detecting the grounding resistance of the centralized grounding device in the power well.

And S8, judging whether the grounding resistance is larger than the target threshold value.

And S9, if the grounding resistance is larger than the target threshold, adding the grounding electrode 6 outside the power well, and returning to S7 until the grounding resistance is smaller than or equal to the target threshold.

Specifically, for example, if the target threshold is 10 ohms, the ground resistance should not be greater than 10 ohms, and if the target threshold is greater than 10 ohms, the ground electrode 6 needs to be added outside the power well. After passing the detection, all welding seams should be carefully checked, and the welding positions should be brushed with anticorrosive paint to prevent corrosion.

The electric power well anti-creeping grounding protection method provided by the invention can avoid the personal safety from being endangered due to the electric leakage of the cable in the electric power well. That is, the invention can effectively solve the problem that the metal shell is electrified to generate strong current to pass through the human body due to insulation damage or other accidents in the electric power well, and can effectively ensure the personal safety.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.