CN110011164B - Novel 10kV high-capacity overhead line lead butt joint method - Google Patents
Novel 10kV high-capacity overhead line lead butt joint method Download PDFInfo
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- CN110011164B CN110011164B CN201910329502.1A CN201910329502A CN110011164B CN 110011164 B CN110011164 B CN 110011164B CN 201910329502 A CN201910329502 A CN 201910329502A CN 110011164 B CN110011164 B CN 110011164B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/28—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wire processing before connecting to contact members, not provided for in groups H01R43/02 - H01R43/26
Abstract
The invention discloses a novel 10kV high-capacity overhead line lead butt joint method, which comprises the following steps: s1: preparing before docking; s2: conducting wire and parallel groove clamp pretreatment; s3: the lead is butted, the lead passes through the parallel groove clamp, the lead passing and down lead are respectively in transition connection with the main conductor by adopting the parallel groove clamp and are not bound with the back end of the insulator; the binding method comprises a binding method, a forking method and a compression joint method; the novel method for butt joint of the 10k V high-capacity overhead line lead is strictly controlled, oxide films and burrs on butt joint contact surfaces are removed by pretreating the surface of the lead and a parallel groove clamping groove, contact resistance can be reduced during butt joint, electric energy loss of the overhead line is saved, the lead can be selected according to different lead types and specifications by adopting three binding methods, butt joint is convenient to use, the lead is firmly in butt joint, strand breakage, twisting and bending are avoided, and butt joint quality is guaranteed.
Description
Technical Field
The invention relates to the technical field of overhead lines, in particular to a novel method for butting leads of a 10k V high-capacity overhead line.
Background
The overhead line mainly refers to an overhead open line, is erected above the ground and is a power transmission line for transmitting electric energy by fixing a power transmission conductor on a tower erected on the ground through an insulator. The power transmission corridor is convenient to erect and maintain and low in cost, but is easily affected by weather and environment (such as strong wind, lightning stroke, dirt, ice and snow and the like) to cause faults, and meanwhile, the whole power transmission corridor occupies a large area of land and easily causes electromagnetic interference to the surrounding environment. The main components of the overhead line are: the cable comprises a conducting wire, a lightning conductor (overhead ground wire), a tower, an insulator, hardware fittings, a tower foundation, a stay wire, a grounding device and the like.
When the leads of the 10k V high-capacity overhead line are butted, the contact surface resistivity of the traditional butting method is high, so that the electric energy loss is serious, and the butting stability and quality are difficult to ensure.
Disclosure of Invention
The invention aims to provide a novel method for butting a lead of a 10k V high-capacity overhead line, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a novel method for butting leads of a 10k V high-capacity overhead line comprises the following steps:
s1: preparing before butt joint, installing an insulator at the butt joint position of a lead of an overhead line, installing the insulator on an iron cross arm to form an insulator string, wherein the insulator string can flexibly rotate in the direction along the line and the direction along the vertical line, and the method comprises the following specific steps:
the upward warping angle of the end part of the iron cross arm is 5-10 degrees;
the insulator is a pin insulator, is vertically arranged on the iron cross arm, and is provided with a spring washer or fixed by double nuts to prevent loosening;
and/or the insulator is an all-ceramic cross arm insulator, and a rubber gasket is additionally arranged on the iron cross arm during installation, so that the surface damage of the all-ceramic cross arm insulator caused by friction is prevented.
S2: the pretreatment of the wire and the parallel groove clamp comprises the following specific steps:
a: removing metal burrs and oxide films on the surface of the lead and in the parallel groove clamp groove;
b: cleaning oil stains on the surface of the lead and the contact surface in the parallel groove clamp groove by adopting absolute ethyl alcohol or acetone liquid, and completely cleaning the oil stains;
c: uniformly coating multiple layers of electric composite grease on the contact surface, wherein the coating thickness is 0.15-0.25mm, the thickness of each layer of electric composite grease is 0.8-0.1mm, the electric composite grease is a composite conductive paste, and the electric composite grease enables the resistivity of the contact surface to be reduced by 35-95%;
s3: the lead is butted in the groove of the parallel groove clamp, and the parallel groove clamp is used for respectively connecting the lead passing wire and the down lead with the lead in a transition way and is not bound with the back end of the insulator; the lead is used for connecting two wire joints (or ends), the down lead is used for guiding grounding, and the wire can be bound by one of a binding method, a forking method and a crimping method according to different wire models and specifications.
Preferably, in step S2, the electric composite grease is applied by wiping the contact surface precoated with the conductive paste with a steel wire brush, and then spreading the conductive paste on the contact surface with clean cotton yarn; the electric composite grease reduces the rate of temperature rise of the contact surface by 35-85%.
Preferably, the electric composite grease is soft composite conductive paste which is prepared by taking mineral oil, synthetic grease oil and silicone oil as base oil, adding conductive, antioxidant, corrosion-resistant and arc-suppression additives, grinding, dispersing, modifying and refining.
Preferably, the binding method comprises the steps of:
a: firstly, combining the joints of two leads, wherein the binding length is 150-200 mm;
b: then, a single-stranded wire with the same type as the lead is used as a binding wire, the single-stranded wire is wound from the middle to two sides, and the single-stranded wire and the lead are twisted into a small braid and are closed when the single-stranded wire is wound to the head;
c: and finally, bending the tail of the lead to prevent the lead from being pulled out.
Preferably, the forking method comprises the steps of:
a: firstly, 1/2 of the length of the wire connector are sequentially detached and straightened, dirt on the surface is removed, and the umbrella frame is made into the shape of an umbrella frame;
b: inserting every two ribs into the bottom in a crossed mode, gathering the inserted wires together, pressing the wires tightly by using electric pliers, winding single wires which are the same as the wires in the middle by 40-60mm, and bending the wire binding heads into right angles to be gathered on the wires after winding;
c: pressing the binding head with the single strand of the wire, gradually winding the binding head towards the two ends, pressing the tail of the remaining front strand below the binding head with the other strand after winding one strand, and continuously winding until winding is finished;
d: after the last strand is wound with rooms at the sides of or facing the principal rooms, the last strand is twisted with the thread end pressed by the front edge into a small braid and is closed, and neutral electric composite grease is coated after the joints are connected, so that the generation of an oxide film is reduced.
Preferably, the crimping method comprises the steps of:
a: binding two wire joints to be connected with a binding wire and then sawing the wire joints to be aligned;
b: selecting proper aluminum crimping pipe and clamping film according to the specification of the wire;
c: cleaning the inner wall of the aluminum compression joint pipe and the surface of the connected part of the lead by using gasoline, and coating a layer of electric composite grease on the surface of the lead;
d: the joint of two connected wires is penetrated into the clamping pipe, the part of the wire joint exposed out of the pipe is not less than 20mm, and the joint is used in the clamping pipe of the steel-cored aluminum stranded wire, an aluminum gasket is clamped between the two wires, so that the connecting force of the joint is increased, and the joint is good;
e: pressing and connecting with a crimping pliers to sequentially press out a certain number of pits, wherein each pit is pressed once and cannot be interrupted midway, and pits with different depths are pressed out according to different types of wires, and the crimping length is 500-600 mm.
Preferably, the clearance distance between the wires of the line and the guy, the pole or the framework after installation is not less than 200mm when the leads of the step S3 are butted.
Preferably, the number of the parallel groove clamps in the step S3 is not less than 2, and the connecting surface of the parallel groove clamps is flat and smooth.
Preferably, the wire connection length of the cross-connection in the step S4 is 200-300mm, and the cross-sectional area of the wire is less than 35mm2。
Preferably, the electric compound grease used is not less than one layer.
Compared with the prior art, the invention has the beneficial effects that: according to the novel method for strictly controlling the butt joint of the 10KV high-capacity overhead line lead, the surface of the lead and the parallel groove clamp groove are pretreated, so that an oxide film and burrs on a butt joint contact surface are removed, contact resistance can be reduced during butt joint, and electric energy loss of the overhead line is saved; meanwhile, the leads adopt three binding methods, can be selected according to different lead models and specifications, are convenient to butt joint and use, are stable in lead butt joint, and have no strand breakage, twisting and dead bending, so that the butt joint quality is ensured.
Drawings
Fig. 1 is a schematic view of the insulator mounting of the present invention;
FIG. 2 is a schematic view of a side-by-side configuration of the parallel groove clamp and lead wire butt joint of the present invention;
FIG. 3 is a schematic top view of the parallel groove clamp and lead butt joint of the present invention.
In the figure: 1 pole, 2 cross arms, 3 insulators, 4 parallel groove clamps, 5 wires and 6 leads.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a plurality of insulators 3 are mounted on a cross arm 2 at the upper end of an electric pole 1, wherein the insulators 3 are pin insulators or (full) porcelain cross arm insulators and are used for fixing a lead in a high-voltage overhead line, the lead is bound by a binding wire and is fixed in a groove at the end part of the insulator, and the lead is insulated from the lead, the lead is insulated from the cross arm, and the lead is insulated from the electric pole; the cross arm 2 is a wood or iron cross arm, is used for mounting insulators, fixed switch equipment, reactors, lightning arresters and the like, and has sufficient mechanical strength and length.
As shown in fig. 2-3, the parallel groove clamp 4 is a schematic connection diagram of the lead 5 and the lead 6, and the parallel groove clamp 4 is a non-force-bearing continuous hardware fitting and is used for butt joint of the lead and the lead.
Example 1
A novel method for butting leads of a 10k V high-capacity overhead line comprises the following steps:
s1: preparing before butt joint, installing an insulator at the butt joint position of a lead of an overhead line, installing the insulator on an iron cross arm to form an insulator string, wherein the insulator string can flexibly rotate in the direction along the line and the direction along the vertical line, and the method comprises the following specific steps:
the upward warping angle of the end part of the iron cross arm is 5 degrees, so that the lead or the lead is prevented from slipping;
the insulator is a pin insulator, is vertically arranged on the iron cross arm, and is provided with a spring washer or fixed by double nuts to prevent loosening;
and/or the insulator is an all-ceramic cross arm insulator, and a rubber gasket is additionally arranged on the iron cross arm during installation, so that the surface damage of the all-ceramic cross arm insulator caused by friction is prevented.
S2: the pretreatment of the wire and the parallel groove clamp comprises the following specific steps:
a: removing metal burrs and oxide films on the surface of the lead and in the parallel groove clamp groove;
b: cleaning oil stains on the surface of the lead and the contact surface in the parallel groove clamp groove by adopting absolute ethyl alcohol or acetone liquid, and completely cleaning the oil stains;
c: coating two layers of electric composite grease on the contact surface, wiping the contact surface on which the conductive paste is pre-coated by a steel wire brush, and then uniformly wiping the conductive paste on the contact surface by clean cotton yarn, wherein the thickness of the electric composite grease is 0.16 mm;
s3: the lead is butted in the groove of the parallel groove clamp, and the parallel groove clamp is used for respectively connecting the lead passing wire and the down lead with the lead in a transition way and is not bound with the back end of the insulator; the lead is used for connecting two wire joints (or ends), the down lead is used for guiding grounding, and the wire can be bound by one of a binding method, a forking method and a crimping method according to different wire models and specifications.
A: the binding method comprises the following steps:
a: firstly, the joints of two leads are combined, and the binding length is 150 mm;
b: then, a single-stranded wire with the same type as the lead is used as a binding wire, the single-stranded wire is wound from the middle to two sides, and the single-stranded wire and the lead are twisted into a small braid and are closed when the single-stranded wire is wound to the head;
c: finally, the tail of the lead is bent, so that the lead is prevented from being pulled out;
b: the method comprises the following steps:
a: firstly, 1/2 of the length of the wire connector are sequentially detached and straightened, dirt on the surface is removed, and the umbrella frame is made into the shape of an umbrella frame;
b: inserting two umbrella ribs to the bottom every other strand of the umbrella ribs in a crossed mode, gathering the inserted wires together, pressing the wires tightly by using electric pliers, winding single wires which are the same as the wires in the middle for 40mm, and bending the wire binding heads into right angles to be gathered on the wires after winding;
c: pressing the binding head with the single strand of the wire, gradually winding the binding head towards the two ends, pressing the tail of the remaining front strand below the binding head with the other strand after winding one strand, and continuously winding until winding is finished;
d: after the last strand is wound with rooms at the sides of or facing the principal rooms, the last strand and the head of the thread pressed by the front side are twisted into a small braid for ending, and neutral electric power compound grease is coated after the joints are connected so as to reduce the generation of an oxide film;
c: the crimping method comprises the following steps:
a: the two joints to be connected are tied up by a binding wire and then are sawn;
b: selecting proper aluminum crimping pipe and clamping film according to the specification of the wire;
c: cleaning the inner wall of the aluminum compression joint pipe and the surface of the connected part of the lead by using gasoline, and coating a layer of electric composite grease on the surface of the lead;
d: the joint of two connected wires is penetrated into the clamping pipe, the part of the wire joint exposed out of the pipe is not less than 20mm, and the joint is used in the clamping pipe of the steel-cored aluminum stranded wire, an aluminum gasket is clamped between the two wires, so that the connecting force of the joint is increased, and the joint is good;
e: pressing and connecting with a crimping pliers to sequentially press out a certain number of pits, wherein each pit is pressed once and cannot be interrupted midway, and pits with different depths are pressed out according to different types of wires, and the crimping length is 500-600 mm.
When the leads of the step S3 are butted, a clearance distance between a lead of the line and a stay, a pole or a frame after installation is not less than 200 mm;
the number of the parallel groove clamps in the step S3 is not less than 2, and the connecting surfaces of the parallel groove clamps are flat and smooth;
the connection length of the wire by the cross connection method is 200mm, and the sectional area of the wire is less than 35mm2；
The electric composite grease enables the resistivity of the contact surface to be reduced by 35 percent (the reduction rate of the contact resistance of the electric composite grease is 35 percent), the electric composite grease enables the temperature rise rate of the contact surface to be reduced by 35 percent (the reduction rate of the temperature rise is 35 percent), the electric composite grease is conductive paste, mineral oil, synthetic grease oil and silicone oil are used as base oil, conductive, antioxidant, anti-corrosion and arc suppression additives are added, and the soft conductive paste is refined through grinding, dispersing and modifying.
Example 2
A novel method for butting leads of a 10k V high-capacity overhead line comprises the following steps:
s1: preparing before butt joint, installing an insulator at the butt joint position of a lead of an overhead line, installing the insulator on an iron cross arm to form an insulator string, wherein the insulator string can flexibly rotate in the direction along the line and the direction along the vertical line, and the method comprises the following specific steps:
the upward warping angle of the end part of the iron cross arm is 7.5 degrees, so that the lead or the lead is prevented from slipping;
the insulator is a pin insulator, is vertically arranged on the iron cross arm, and is provided with a spring washer or fixed by double nuts to prevent loosening;
and/or the insulator is an all-ceramic cross arm insulator, and a rubber gasket is additionally arranged on the iron cross arm during installation, so that the surface damage of the all-ceramic cross arm insulator caused by friction is prevented.
S2: the pretreatment of the wire and the parallel groove clamp comprises the following specific steps:
a: removing metal burrs and oxide films on the surface of the lead and in the parallel groove clamp groove;
b: cleaning oil stains on the surfaces of the wires and the contact surfaces of the parallel groove clamp grooves by adopting absolute ethyl alcohol or acetone liquid, and completely cleaning the oil stains;
c: coating two layers of electric composite grease on the contact surface, wiping the contact surface on which the conductive paste is pre-coated by a steel wire brush, and then uniformly wiping the conductive paste on the contact surface by clean cotton yarn, wherein the thickness of the electric composite grease is 0.2 mm;
s3: the lead is butted in the groove of the parallel groove clamp, and the parallel groove clamp is used for respectively connecting the lead passing wire and the down lead with the lead in a transition way and is not bound with the back end of the insulator; the lead is used for connecting two wire joints (or ends), the down lead is used for guiding grounding, and the wire can be bound by one of a binding method, a forking method and a crimping method according to different wire models and specifications.
A: the binding method comprises the following steps:
a: firstly, the joints of two leads are combined, and the binding length is 175 mm;
b: then, a single-stranded wire with the same type as the lead is used as a binding wire, the single-stranded wire is wound from the middle to two sides, and the single-stranded wire and the lead are twisted into a small braid and are closed when the single-stranded wire is wound to the head;
c: finally, the tail of the lead is bent, so that the lead is prevented from being pulled out;
b: the method comprises the following steps:
a: firstly, 1/2 of the length of the wire connector are sequentially detached and straightened, dirt on the surface is removed, and the umbrella frame is made into the shape of an umbrella frame;
b: inserting two umbrella ribs to the bottom every other strand of the umbrella ribs in a crossed mode, gathering the inserted wires together, pressing the wires tightly by using electric pliers, winding 50mm of single wires in the middle of the wires by using the single wires as the wires, and bending the wire binding heads into right angles to be gathered on the wires after winding;
c: pressing the binding head with the single strand of the wire, gradually winding the binding head towards the two ends, pressing the tail of the remaining front strand below the binding head with the other strand after winding one strand, and continuously winding until winding is finished;
d: after the last strand is wound with rooms at the sides of or facing the principal rooms, the last strand and the head of the thread pressed by the front side are twisted into a small braid for ending, and neutral electric power compound grease is coated after the joints are connected so as to reduce the generation of an oxide film;
c: the crimping method comprises the following steps:
a: the two joints to be connected are tied up by a binding wire and then are sawn;
b: selecting proper aluminum crimping pipe and clamping film according to the specification of the wire;
c: cleaning the inner wall of the aluminum compression joint pipe and the surface of the connected part of the lead by using gasoline, and coating a layer of electric composite grease on the surface of the lead;
d: the joint of two connected wires is penetrated into the clamping pipe, the part of the wire joint exposed out of the pipe is not less than 20mm, and the joint is used in the clamping pipe of the steel-cored aluminum stranded wire, an aluminum gasket is clamped between the two wires, so that the connecting force of the joint is increased, and the joint is good;
e: pressing and connecting with a crimping pliers to sequentially press out a certain number of pits, wherein each pit is pressed once and cannot be interrupted midway, and pits with different depths are pressed out according to different types of wires, and the crimping length is 500-600 mm.
When the leads of the step S3 are butted, a clearance distance between a lead of the line and a stay, a pole or a frame after installation is not less than 200 mm;
the number of the parallel groove clamps in the step S3 is not less than 2, and the connecting surfaces of the parallel groove clamps are flat and smooth;
the connection length of the wire by the cross connection method is 250mm, and the sectional area of the wire is less than 35mm2；
The electric composite grease is soft conductive paste which is prepared by grinding, dispersing, modifying and refining, wherein the reduction rate of the contact resistance of the electric composite grease is 65%, the temperature reduction rate is 60%, the electric composite grease is conductive paste, mineral oil, synthetic grease oil and silicone oil are used as base oil, and conductive, antioxidant, anti-corrosion and arc-suppression additives are added.
Example 3
A novel method for butting leads of a 10k V high-capacity overhead line comprises the following steps:
s1: preparing before butt joint, installing an insulator at the butt joint position of a lead of an overhead line, installing the insulator on an iron cross arm to form an insulator string, wherein the insulator string can flexibly rotate in the direction along the line and the direction along the vertical line, and the method comprises the following specific steps:
the upward warping angle of the end part of the iron cross arm is 10 degrees, so that the lead or the lead is prevented from slipping;
the insulator is a pin insulator, is vertically arranged on the iron cross arm, and is provided with a spring washer or fixed by double nuts to prevent loosening;
and/or the insulator is an all-ceramic cross arm insulator, and a rubber gasket is additionally arranged on the iron cross arm during installation, so that the surface damage of the all-ceramic cross arm insulator caused by friction is prevented.
S2: the pretreatment of the wire and the parallel groove clamp comprises the following specific steps:
a: removing metal burrs and oxide films on the surface of the lead and in the parallel groove clamp groove;
b: cleaning oil stains on the surfaces of the wires and the contact surfaces of the parallel groove clamp grooves by adopting absolute ethyl alcohol or acetone liquid, and completely cleaning the oil stains;
c: coating three layers of electric composite grease on the contact surface, wiping the contact surface on which the conductive paste is pre-coated by a steel wire brush, and then uniformly wiping the conductive paste on the contact surface by clean cotton yarn, wherein the thickness of the electric composite grease is 0.25 mm;
s3: the lead is butted in the groove of the parallel groove clamp, and the parallel groove clamp is used for respectively connecting the lead passing wire and the down lead with the lead in a transition way and is not bound with the back end of the insulator; the lead is used for connecting two wire joints (or ends), the down lead is used for guiding grounding, and the wire can be bound by one of a binding method, a forking method and a crimping method according to different wire models and specifications.
A: the binding method comprises the following steps:
a: firstly, the joints of two wires are combined, and the binding length is 200 mm;
b: then, a single-stranded wire with the same type as the lead is used as a binding wire, the single-stranded wire is wound from the middle to two sides, and the single-stranded wire and the lead are twisted into a small braid and are closed when the single-stranded wire is wound to the head;
c: finally, the tail of the lead is bent, so that the lead is prevented from being pulled out;
b: the method comprises the following steps:
a: firstly, 1/2 of the length of the wire connector are sequentially detached and straightened, dirt on the surface is removed, and the umbrella frame is made into the shape of an umbrella frame;
b: inserting two umbrella ribs to the bottom every other strand of the umbrella ribs in a crossed mode, gathering the inserted wires together, pressing the wires tightly by using electric pliers, winding the single wires in the middle by 60mm, and bending the wire binding heads into right angles to be gathered on the wires after winding;
c: pressing the binding head with the single strand of the wire, gradually winding the binding head towards the two ends, pressing the tail of the remaining front strand below the binding head with the other strand after winding one strand, and continuously winding until winding is finished;
d: after the last strand is wound with rooms at the sides of or facing the principal rooms, the last strand and the head of the thread pressed by the front side are twisted into a small braid for ending, and neutral electric power compound grease is coated after the joints are connected so as to reduce the generation of an oxide film;
c: the crimping method comprises the following steps:
a: the two joints to be connected are tied up by a binding wire and then are sawn;
b: selecting proper aluminum crimping pipe and clamping film according to the specification of the wire;
c: cleaning the inner wall of the aluminum compression joint pipe and the surface of the connected part of the lead by using gasoline, and coating a layer of electric composite grease on the surface of the lead;
d: the joint of two connected wires is penetrated into the clamping pipe, the part of the wire joint exposed out of the pipe is not less than 20mm, and the joint is used in the clamping pipe of the steel-cored aluminum stranded wire, an aluminum gasket is clamped between the two wires, so that the connecting force of the joint is increased, and the joint is good;
e: pressing and connecting with a crimping pliers to sequentially press out a certain number of pits, wherein each pit is pressed once and cannot be interrupted midway, and pits with different depths are pressed out according to different types of wires, and the crimping length is 500-600 mm.
When the leads of the step S3 are butted, a clearance distance between a lead of the line and a stay, a pole or a frame after installation is not less than 200 mm;
the number of the parallel groove clamps in the step S3 is not less than 2, and the connecting surfaces of the parallel groove clamps are flat and smooth;
the connection length of the wire by the cross connection method is 300mm, and the sectional area of the wire is less than 35mm2；
The electric composite grease is soft conductive paste which is prepared by grinding, dispersing, modifying and refining, wherein the reduction rate of the contact resistance of the electric composite grease is 95%, the temperature reduction rate is 85%, the electric composite grease is conductive paste, mineral oil, synthetic grease oil and silicone oil are used as base oil, and conductive, antioxidant, anti-corrosion and arc-suppression additives are added.
In the novel 10k V large-capacity overhead line lead butt joint method, the corresponding binding or cross-connecting length of the lead and the data of the specific embodiment of the binding method are as follows:
in summary, the following steps: the novel method for butt joint of the 10k V high-capacity overhead line lead is strictly controlled, oxide films and burrs on butt joint contact surfaces are removed by pretreating the surface of the lead and a parallel groove clamping groove, contact resistance can be reduced during butt joint, electric energy loss of the overhead line is saved, the lead can be selected according to different lead types and specifications by adopting three binding methods, butt joint is convenient to use, the lead is firmly in butt joint, strand breakage, twisting and bending are avoided, and butt joint quality is guaranteed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A novel method for butting leads of a 10k V high-capacity overhead line is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing before butt joint, namely installing an insulator at the butt joint position of a lead of an overhead line, wherein the insulator is installed on an iron cross arm and forms an insulator string which can flexibly rotate in the direction along the line and in the direction perpendicular to the line;
s2: the pretreatment of the wire and the parallel groove clamp comprises the following specific steps:
a: removing metal burrs and oxide films on the surface of the lead and in the parallel groove clamp groove;
b: the method comprises the following steps of (1) lightly wiping oil stains on the surface of a lead and the contact surface of the lead and the parallel groove clamp groove by using absolute ethyl alcohol or acetone liquid, and completely removing the oil stains;
c: uniformly coating multiple layers of electric composite grease on the contact surface, wherein the coating thickness is 0.15-0.25mm, the thickness of each layer of electric composite grease is 0.8-0.1mm, the electric composite grease is a composite conductive paste, and the electric composite grease enables the resistivity of the contact surface to be reduced by 35-95%;
s3: the lead wire is in the inslot of parallel groove clamp docks, and parallel groove clamp will cross lead wire, downlead respectively with wire transitional coupling, not with the insulator returns to bind together, the wire can select one of binding method, fork joint method, crimping method to ligature according to different wire models and specification.
2. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 1, wherein the method comprises the following steps:
in the step S1, the upward tilting angle of the end of the iron cross arm is 5-10 °;
the insulator is a pin insulator, is vertically arranged on the iron cross arm, and is provided with a spring washer or fixed by double nuts to prevent loosening;
and/or the insulator is an all-ceramic cross arm insulator, and a rubber gasket is additionally arranged on the iron cross arm during installation, so that the surface damage of the all-ceramic cross arm insulator caused by friction is prevented.
3. The novel method for butting the leads of the 10k V high-capacity overhead line according to claim 2, wherein the method comprises the following steps:
in the step S2, the coating method of the electric composite grease includes wiping the contact surface precoated with the conductive paste with a steel wire brush, and then evenly wiping the conductive paste on the contact surface with clean cotton yarn;
the electric composite grease reduces the rate of temperature rise of the contact surface by 35-85%.
4. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 3, wherein the method comprises the following steps:
in the step S2, the electric composite grease is a soft composite conductive paste prepared by adding conductive, antioxidant, corrosion-resistant and arc-suppressing additives into mineral oil, synthetic grease oil and silicone oil as base oil, and grinding, dispersing, modifying and refining the mixture.
5. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 4, wherein the method comprises the following steps:
the binding method comprises the following steps:
a: firstly, combining the joints of two leads, wherein the binding length is 150-200 mm;
b: then, a single-stranded wire with the same type as the lead is used as a binding wire, the single-stranded wire is wound from the middle to two sides, and the single-stranded wire and the lead are twisted into a small braid and are closed when the single-stranded wire is wound to the head;
c: and finally, bending the tail of the lead to prevent the lead from being pulled out.
6. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 4, wherein the method comprises the following steps:
the cross-connection method comprises the following steps:
a: firstly, 1/2 of the length of the wire connector are sequentially detached and straightened, dirt on the surface is removed, and the umbrella frame is made into the shape of an umbrella frame;
b: inserting every two ribs into the bottom in a crossed mode, gathering the inserted wires together, pressing the wires tightly by using electric pliers, winding single wires which are the same as the wires in the middle by 40-60mm, and bending the wire binding heads into right angles to be gathered on the wires after winding;
c: pressing the binding head with the single strand of the wire, gradually winding the binding head towards the two ends, pressing the tail of the remaining front strand below the binding head with the other strand after winding one strand, and continuously winding until winding is finished;
d: after the last strand is wound with rooms at the sides of or facing the principal rooms, the last strand is twisted with the thread end pressed by the front edge into a small braid and is closed, and neutral electric composite grease is coated after the joints are connected, so that the generation of an oxide film is reduced.
7. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 4, wherein the method comprises the following steps:
the crimping method comprises the following steps:
a: binding two wire joints to be connected with a binding wire and then sawing the wire joints to be aligned;
b: selecting proper aluminum crimping pipe and clamping film according to the specification of the wire;
c: cleaning the inner wall of the aluminum compression joint pipe and the surface of the connected part of the lead by using gasoline, and coating a layer of electric composite grease on the surface of the lead;
d: the joint of two connected wires is penetrated into the clamping pipe, the part of the wire joint exposed out of the pipe is not less than 20mm, and the joint is used in the clamping pipe of the steel-cored aluminum stranded wire, an aluminum gasket is clamped between the two wires, so that the connecting force of the joint is increased, and the joint is good;
e: pressing and connecting with a crimping pliers to sequentially press out a certain number of pits, wherein each pit is pressed once and cannot be interrupted midway, and pits with different depths are pressed out according to different types of wires, and the crimping length is 500-600 mm.
8. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 4, wherein the method comprises the following steps:
and the clearance distance between the conducting wire of the line and the stay wire, the pole or the framework after installation is not less than 200mm when the leads of the step S3 are butted.
9. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 4, wherein the method comprises the following steps:
in the step S3, the number of the parallel groove clamps is not less than 2, and the connection surface of the parallel groove clamps is flat and smooth.
10. The novel method for butting the leads of a 10k V high-capacity overhead line, according to claim 6, wherein the method comprises the following steps:
the connection length of the wire of the cross connection method is 200-300mm, and the sectional area of the wire is less than 35mm2。
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| CN101546669B (en) * | 2009-04-28 | 2012-09-05 | 徐殿成 | Method and device for connecting drop switch leads of 10kv transformer |
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