CN109347048B - Live-line installation method of low-voltage lightning arrester - Google Patents
Live-line installation method of low-voltage lightning arrester Download PDFInfo
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- CN109347048B CN109347048B CN201811308897.9A CN201811308897A CN109347048B CN 109347048 B CN109347048 B CN 109347048B CN 201811308897 A CN201811308897 A CN 201811308897A CN 109347048 B CN109347048 B CN 109347048B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/40—Connection to earth
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/01—Mounting; Supporting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
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- Physics & Mathematics (AREA)
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- Gas-Insulated Switchgears (AREA)
Abstract
An electrified installation method of a low-voltage arrester belongs to the field of arresters. A hollow double-head operating rod is arranged; a first concave hole is formed in the upper end of the double-end operating rod; the lower end of the double-end operating rod is provided with a second concave hole; the upper end and the lower end of the double-end operating rod are connected into a whole through the insulating rod; and corresponding mounting holes are formed in the corresponding bottom edges of the binding posts at the lower end of the operating disconnecting link in the field cabinet and serve as passages for the low-voltage arrester body and the double-head operating rod to enter the field cabinet. The original transverse working mode of installing the lightning arrester from the front side of the on-site cabinet is changed into a vertical working mode of sending the low-voltage lightning arrester into the cabinet from the bottom of the installation cabinet and installing the low-voltage lightning arrester, so that the low-voltage lightning arrester is installed in an electrified way, and maintenance and replacement of the low-voltage lightning arrester are rapidly carried out on the site of a power supply line by maintenance personnel greatly. The device can be widely applied to the field operation maintenance or replacement work field of low-voltage lightning arresters with working voltages of 1kV to below 0.5 kV.
Description
Technical Field
The invention belongs to the field of lightning arresters, and particularly relates to a lightning arrester for overvoltage protection of a low-voltage power system.
Background
A surge arrester is an electrical device used to protect electrical equipment from transient overvoltages (lightning strikes, operation, steep waves) and to rapidly cut off power frequency follow currents, usually in parallel with the line or equipment being protected.
Its main internal element is a non-linear resistor (such as zinc oxide resistor disc), and because of its good non-linearity, it is in high-resistance state under normal power frequency voltage, and the lightning arrester can not be operated. When overvoltage occurs, the lightning arrester acts to conduct the resistor disc, overvoltage impact current absorbs partial energy through the resistor disc and then leaks to the ground, so that the overvoltage is cut, the overvoltage value suffered by protected equipment is reduced, the overvoltage of a power supply circuit is limited, the insulation of electrical equipment is protected, and the effect of protecting the electrical equipment is achieved. When the overvoltage disappears, the lightning arrester is rapidly restored to the original state, so that the system can normally supply power.
The existing low-voltage lightning arrester is usually installed in a field cabinet on a telegraph pole (short for being called a pole), and a three-phase knife switch is usually arranged in a conventional field cabinet; the upper ends of the three-phase knife switch are respectively and correspondingly connected with the three-phase lines of the power transmission line; the upper ends of the three single-phase low-voltage arresters are respectively fixed on a wiring terminal or a wiring hole at the lower end of the three-phase knife switch; the lower end of each single-phase low-voltage arrester is provided with a grounding lead and a wiring nose which are correspondingly connected with the grounding electrode.
The existing wiring mode of the low-voltage arrester is that a wiring nose or a wiring bolt is fixed on a wiring terminal or a wiring hole at the lower end of a three-phase knife switch, and a grounding lead and the wiring nose at the lower end of the low-voltage arrester are also fixed on a grounding bar in a cabinet by bolts.
Based on the reason in the design, the terminal or the wiring hole of current three-phase knife switch lower extreme and the interior ground connection of cabinet are arranged according to the angle that the operator openly operated in the face of the installation cabinet, so all screw mounting holes all transversely set up.
In practical operation, when one or more of a group of three low-voltage arresters is damaged or penetrated by lightning, an operator is required to climb on the electric pole to replace the low-voltage arresters.
Because current installation cabinet inner space is limited, and current screw mounting hole all is horizontal setting, adopts current spanner to carry out the installation work in-process of low pressure arrester, and the electrified part on every side is very easily touch to metal material's spanner, very is unfavorable for live equipment's safe operation and operator's personal safety. Therefore, under the existing conditions, the work of replacing the low-voltage arrester is usually carried out in a power failure state, so that the operation is inconvenient for a single person in a charged state, the continuous operation rate of power supply equipment is influenced, and the inconvenience in the power utilization process is also brought to power receiving users.
In practical work, a working mode or a method for replacing the low-voltage arrester in a live state, which can be carried out by a single person and is convenient for single-hand operation, is urgently needed to ensure the continuous operation of a power supply line and quickly recover the power supply operation of a fault line.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electrified installation method of a low-voltage arrester. It is through adopting hollow double-end action bars, with the original horizontal mode of installing the arrester from the scene cabinet openly, change into through sending into the vertical mode of installing in the cabinet and carrying out the installation with the low-voltage arrester from the installation cabinet bottom, realized the electrified installation of low-voltage arrester, made things convenient for maintenance person to carry out the maintenance and the change of low-voltage arrester rapidly at the scene of power supply line greatly.
The technical scheme of the invention is as follows: the low-voltage arrester comprises a wiring terminal positioned at the upper end of a low-voltage arrester body and a grounding lead positioned at the lower end of the low-voltage arrester body and used for being connected with a grounding electrode, wherein the low-voltage arrester is arranged in a field cabinet on an electric pole; the on-site cabinet is internally provided with three-phase disconnecting links, and a low-voltage arrester is correspondingly arranged below each phase disconnecting link switch; the method is characterized in that:
a vertical internal thread interface is arranged on a binding post at the lower end of the operating knife switch in the on-site cabinet;
an external thread type screw rod is arranged on a wiring terminal at the upper end of the low-voltage arrester body;
fixedly connecting an L-shaped strip grounding electrode at the lower part in the on-site cabinet;
the vertical edge of the L-shaped strip-shaped grounding electrode is fixedly connected to the inner wall of the on-site cabinet, and 3 screw holes are formed in the transverse edge of the L-shaped strip-shaped grounding electrode;
arranging a hollow double-head operating rod;
the upper end of the double-head operating rod is provided with a first concave hole matched with the shape and the size of the lower end of the low-voltage arrester body;
the lower end of the double-end operating rod is provided with a second concave hole matched with the shape and the size of the head of a screw used by the grounding lead;
the upper end and the lower end of the double-end operating rod are connected into a whole through a hollow insulating rod;
corresponding mounting openings are formed in the corresponding bottom edge of a binding post at the lower end of the operating disconnecting link in the field cabinet and are used as passages for the low-voltage arrester body and the double-head operating rod to enter the field cabinet;
a grounding lead connected with the lower end of the low-voltage arrester body penetrates into the hollow part of the double-head operating rod;
placing the lower end of the low-voltage arrester body into a first concave hole at the upper end of the double-head operating rod;
the upper end of the double-head operating rod and the low-voltage arrester body are conveyed into the field cabinet through the mounting opening;
when the external thread type screw at the upper end of the low-voltage arrester body is aligned with the internal thread interface at the lower end of the operating switch, the double-head operating rod is rotated to connect the low-voltage arrester body to the internal thread interface at the lower end of the operating switch in a screwing manner;
the double-end operating rod is drawn out;
placing the head of a fixing screw for fixing the grounding lead into the second concave hole;
the lower end of the double-head operating rod loaded with the fixing screw and the grounding lead wire connecting nose is sent into the field cabinet through the mounting hole;
sleeving a screw rod of the fixing screw with a wiring lug of the grounding lead;
when the screw rod of the fixing screw is aligned with the screw hole on the transverse edge of the L-shaped strip-shaped grounding electrode, the double-end operating rod is rotated, and the fixing screw and the wiring lug of the grounding lead are screwed in the screw hole on the transverse edge of the L-shaped strip-shaped grounding electrode;
the double-end operating rod is drawn out;
and finishing the live installation process of the low-voltage arrester.
Specifically, the low-voltage arrester is a single-phase arrester.
Furthermore, an internal thread interface on a binding post at the lower end of the operating switch is vertically arranged.
The diameter of the installation hole at the bottom of the on-site cabinet is larger than the outer diameter of the low-voltage arrester body.
The head of the fixing screw is in a regular polygon shape.
Furthermore, the head of the fixing screw is in a regular hexagon shape.
The low-voltage arrester is installed/fixed on a binding post at the lower end of an operation disconnecting link in the on-site cabinet.
The upper end and the lower end of the double-end operating rod and the hollow insulating rod are made of insulating materials.
Compared with the prior art, the technical scheme of the invention has the advantages that:
1. the internal thread interface on the wiring terminal at the lower end of the operating disconnecting link and the screw hole on the strip-shaped grounding electrode are vertically arranged from horizontal arrangement, and a hollow double-head operating rod is used for assisting, so that the original working mode of transversely installing the lightning arrester on the front side is changed into a vertical working mode of entering from the bottom of the installation cabinet and installing the low-voltage lightning arrester, the live installation of the low-voltage lightning arrester is realized, and the maintenance and replacement of the low-voltage lightning arrester can be rapidly carried out on the pole operation site of an outdoor power supply line by maintenance personnel;
2. the hollow double-end operating rod is small in length and size, convenient to carry, convenient to operate by a single person and a single hand, and greatly convenient for maintenance personnel to carry out live working on the rod on an outdoor site.
Drawings
Fig. 1 is a schematic structural view of the appearance of the low-voltage arrester of the invention;
FIG. 2 is a schematic view of the basic structure of the hollow double-ended operating rod;
fig. 3 is a schematic view of the method of installing a surge arrester of the present invention;
fig. 4 is a schematic view of the ground pole mounting screw of the present invention.
In the figure, 1 is a low-voltage arrester body, 1-1 is a positioning bulge on the outer surface of the low-voltage arrester body, 2 is an external thread type screw rod at the upper end of the low-voltage arrester body, 3 is a grounding lead, 4 is a wiring lug, 5 is an on-site cabinet, 6 is an internal thread interface at the lower end of an operating switch, 7 is a strip-shaped grounding electrode, 7-1 is a screw hole on the transverse edge of an L-shaped strip-shaped grounding electrode, 8 is a double-head operating rod, 8-1 is a first concave hole, 8-3 is a positioning groove, 8-2 is a second concave hole, 9 is a fixing screw, and 10 is an installation hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In fig. 1, the technical solution of the present invention provides a live-line installation method of a low-voltage arrester, the low-voltage arrester includes a wiring terminal located at the upper end of a low-voltage arrester body 1, and a ground lead 3 located at the lower end of the low-voltage arrester body for connecting with a ground electrode, the low-voltage arrester is installed in a field cabinet 5 on an electric pole; the on-site cabinet is internally provided with three-phase disconnecting links, and a low-voltage arrester is correspondingly arranged below each phase disconnecting link switch; the method is characterized in that:
a vertical internal thread interface 6 is arranged on a binding post at the lower end of the operating knife switch in the on-site cabinet;
an external thread type screw rod 2 is arranged on a wiring terminal at the upper end of the low-voltage arrester body;
fixedly connecting a strip-shaped grounding electrode 7 with an L-shaped cross section at the lower part in the on-site cabinet;
the vertical edge of the L-shaped strip-shaped grounding electrode is fixedly connected to the inner wall of the on-site cabinet, and 3 screw holes 7-1 are formed in the transverse edge of the L-shaped strip-shaped grounding electrode;
in fig. 2, a schematic structural view of the hollow double-headed operating lever 8 is shown.
The upper end of the double-head operating rod is provided with a first concave hole 8-1 matched with the shape and the size of the lower end of the low-voltage arrester body;
the lower end of the double-end operating rod is provided with a second concave hole 8-2 matched with the shape and the size of the head of a screw used by the grounding lead;
the upper end and the lower end of the double-end operating rod are connected into a whole through a hollow insulating rod.
As the periphery of the low-voltage arrester body is provided with the plurality of positioning bulges 1-1, correspondingly, the inner wall of the first concave hole 8-1 is correspondingly matched with the positioning grooves 8-3 with the same number.
Since the head of the fixing screw is regular polygon (usually, the head of the fixing screw is regular hexagon), the cross section of the second recess 8-2 is also regular polygon structure to accommodate the head of the fixing screw.
In fig. 3, a corresponding mounting opening 10 is formed in the corresponding bottom edge of the terminal at the lower end of the operating disconnecting link in the field cabinet, and is used as a passage for the low-voltage arrester body and the double-head operating rod to enter the field cabinet;
as shown in fig. 3, when the live-line installation operation is performed, the ground lead connected to the lower end of the low voltage arrester body is inserted into the hollow portion of the double-headed operating rod;
placing the lower end of the low-voltage arrester body into a first concave hole at the upper end of the double-head operating rod;
the upper end of the double-head operating rod and the low-voltage arrester body are conveyed into the field cabinet through an installation opening 10 positioned at the bottom of the installation cabinet;
when the external thread type screw at the upper end of the low-voltage arrester body is aligned with the internal thread interface at the lower end of the operating switch, the double-head operating rod is rotated to connect the low-voltage arrester body to the internal thread interface at the lower end of the operating switch in a screwing manner;
the double-end operating rod is drawn out;
in fig. 4, the head of the fixing screw 9 for fixing the ground lead is placed in the second recess hole;
the lower end of the double-head operating rod loaded with the fixing screw and the grounding lead wire connecting nose is sent into the field cabinet through the mounting hole;
sleeving a screw rod of the fixing screw with a wiring lug of the grounding lead;
after aligning a screw rod of a fixing screw with a screw hole on the transverse edge of the L-shaped strip-shaped grounding electrode, rotating a double-end operating rod, screwing the fixing screw and a wiring lug of a grounding lead, and fixing the fixing screw and the wiring lug in a screw hole 7-1 on the transverse edge of the L-shaped strip-shaped grounding electrode;
the double-end operating rod is drawn out;
and finishing the live installation process of the low-voltage arrester.
The low-voltage arrester is a single-phase arrester, namely, a low-voltage arrester is arranged below each knife switch of the three-phase operation knife switch.
The internal thread connector on the binding post at the lower end of the operating switch is vertically arranged.
Further, the diameter of the installation hole 10 at the bottom of the field cabinet is larger than the outer diameter of the low-voltage arrester body 1.
As shown in fig. 3 and 4, the low voltage arrester is mounted/fixed on a terminal post at the lower end of the operating disconnecting link in the field cabinet.
Furthermore, the upper end and the lower end of the double-end operating rod and the hollow insulating rod are made of insulating materials.
This technical scheme is through the screw hole on internal thread interface and the strip earthing pole on the terminal of operation switch lower extreme by original horizontal setting, change vertical setting into, assist with hollow double-end action bars, the horizontal mode of installing the low pressure arrester with original installation operator need openly face the on-the-spot cabinet, change into the vertical mode of installing the low pressure arrester through sending into and carrying out the installation from the installation cabinet bottom, the electrified installation of low pressure arrester has been realized, the maintenance and the change that carry out the low pressure arrester rapidly in the scene of maintenance personal at the power supply line have been made things convenient for greatly.
The hollow double-end operating rod in the technical scheme has small length and size, is convenient to carry about and operate by a single hand, and greatly facilitates live working of maintenance personnel on the rod in an outdoor site.
The invention can be widely applied to the field of field operation maintenance or replacement work of low-voltage lightning arresters with working voltages of 1kV to below 0.5 kV.
Claims (8)
1. The live installation method of the low-voltage arrester comprises a wiring terminal positioned at the upper end of a low-voltage arrester body and a grounding lead positioned at the lower end of the low-voltage arrester body and used for being connected with a grounding electrode, wherein the low-voltage arrester is installed in a field cabinet on an electric pole; the on-site cabinet is internally provided with three-phase disconnecting links, and a low-voltage arrester is correspondingly arranged below each phase disconnecting link switch; the method is characterized in that:
a vertical internal thread interface is arranged on a binding post at the lower end of the operating knife switch in the on-site cabinet;
an external thread type screw rod is arranged on a wiring terminal at the upper end of the low-voltage arrester body;
fixedly connecting an L-shaped strip grounding electrode at the lower part in the on-site cabinet;
the vertical edge of the L-shaped strip-shaped grounding electrode is fixedly connected to the inner wall of the on-site cabinet, and 3 screw holes are formed in the transverse edge of the L-shaped strip-shaped grounding electrode;
arranging a hollow double-head operating rod;
the upper end of the double-head operating rod is provided with a first concave hole matched with the shape and the size of the lower end of the low-voltage arrester body;
the lower end of the double-end operating rod is provided with a second concave hole matched with the shape and the size of the head of a screw used by the grounding lead;
the upper end and the lower end of the double-end operating rod are connected into a whole through a hollow insulating rod;
corresponding mounting openings are formed in the corresponding bottom edge of a binding post at the lower end of the operating disconnecting link in the field cabinet and are used as passages for the low-voltage arrester body and the double-head operating rod to enter the field cabinet;
a grounding lead connected with the lower end of the low-voltage arrester body penetrates into the hollow part of the double-head operating rod;
placing the lower end of the low-voltage arrester body into a first concave hole at the upper end of the double-head operating rod;
the upper end of the double-head operating rod and the low-voltage arrester body are conveyed into the field cabinet through the mounting opening;
when the external thread type screw at the upper end of the low-voltage arrester body is aligned with the internal thread interface at the lower end of the operating switch, the double-head operating rod is rotated to connect the low-voltage arrester body to the internal thread interface at the lower end of the operating switch in a screwing manner;
the double-end operating rod is drawn out;
placing the head of a fixing screw for fixing the grounding lead into the second concave hole;
the lower end of the double-head operating rod loaded with the fixing screw and the grounding lead wire connecting nose is sent into the field cabinet through the mounting hole;
sleeving a screw rod of the fixing screw with a wiring lug of the grounding lead;
when the screw rod of the fixing screw is aligned with the screw hole on the transverse edge of the L-shaped strip-shaped grounding electrode, the double-end operating rod is rotated, and the fixing screw and the wiring lug of the grounding lead are screwed in the screw hole on the transverse edge of the L-shaped strip-shaped grounding electrode;
the double-end operating rod is drawn out;
and finishing the live installation process of the low-voltage arrester.
2. A method for live installation of a low-voltage arrester according to claim 1, characterized in that the low-voltage arrester is a single-phase arrester.
3. The live-line installation method of the low voltage arrester as claimed in claim 1, wherein the female connector on the terminal at the lower end of the operating switch is vertically disposed.
4. The live installation method of a low voltage arrester according to claim 1, wherein a diameter of the installation opening of the bottom of the field cabinet is larger than an outer diameter of the low voltage arrester body.
5. The live-line installation method of a low voltage arrester as claimed in claim 1, wherein the head of the fixing screw is a regular polygon.
6. The live-line installation method of a low voltage arrester according to claim 5, wherein the head of the fixing screw is a regular hexagon.
7. The live installation method of a low voltage arrester as claimed in claim 1, wherein the low voltage arrester is installed on a terminal post at a lower end of an operating switch in a field cabinet.
8. The live-line installation method of a low voltage arrester as claimed in claim 1, wherein the upper and lower ends of the double-ended operating rod and the hollow insulating rod are made of insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811308897.9A CN109347048B (en) | 2018-11-05 | 2018-11-05 | Live-line installation method of low-voltage lightning arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811308897.9A CN109347048B (en) | 2018-11-05 | 2018-11-05 | Live-line installation method of low-voltage lightning arrester |
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| Publication Number | Publication Date |
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| CN109347048A CN109347048A (en) | 2019-02-15 |
| CN109347048B true CN109347048B (en) | 2020-05-12 |
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| CN201811308897.9A Active CN109347048B (en) | 2018-11-05 | 2018-11-05 | Live-line installation method of low-voltage lightning arrester |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112039010A (en) * | 2020-09-04 | 2020-12-04 | 嘉兴麦远文化传媒有限公司 | Wireless lightning arrester installation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203843753U (en) * | 2014-04-23 | 2014-09-24 | 国家电网公司 | Unidirectional cranked-handle wrench for live removal of arrester stud bolts |
| KR101721838B1 (en) * | 2017-02-20 | 2017-04-11 | 주식회사신암전력 | Connect device for terminal arrester |
| CN206401785U (en) * | 2016-12-23 | 2017-08-11 | 湖北汉成电气有限公司 | A kind of photovoltaic type transformer substation high-voltage room arrester fixing device |
| CN207459549U (en) * | 2017-06-09 | 2018-06-05 | 国网山东省电力公司五莲县供电公司 | Earth potential live job mix instrument |
-
2018
- 2018-11-05 CN CN201811308897.9A patent/CN109347048B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203843753U (en) * | 2014-04-23 | 2014-09-24 | 国家电网公司 | Unidirectional cranked-handle wrench for live removal of arrester stud bolts |
| CN206401785U (en) * | 2016-12-23 | 2017-08-11 | 湖北汉成电气有限公司 | A kind of photovoltaic type transformer substation high-voltage room arrester fixing device |
| KR101721838B1 (en) * | 2017-02-20 | 2017-04-11 | 주식회사신암전력 | Connect device for terminal arrester |
| CN207459549U (en) * | 2017-06-09 | 2018-06-05 | 国网山东省电力公司五莲县供电公司 | Earth potential live job mix instrument |
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