CN109406930A - A kind of method that U-shaped short-circuit test device is installed in livewire work - Google Patents
A kind of method that U-shaped short-circuit test device is installed in livewire work Download PDFInfo
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- CN109406930A CN109406930A CN201811246956.4A CN201811246956A CN109406930A CN 109406930 A CN109406930 A CN 109406930A CN 201811246956 A CN201811246956 A CN 201811246956A CN 109406930 A CN109406930 A CN 109406930A
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- transmission line
- power transmission
- installation site
- coaster
- circuit test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The application provides a kind of method that U-shaped short-circuit test device is installed in livewire work, carries out the position of short-circuit test in power transmission line including first determining；Equipotential live line work mode is used again, and winding protection is implemented to the first installation site and the second installation site；And coaster is connected on corresponding position；Insulating cord will be lifted by crane again across the vertical wires of coaster pulling test device, until vertical wires contact power transmission line；Finally the link position by vertical wires in power transmission line is fixed, and removes lifting insulating cord, coaster.The application uses equipotential live line work mode, experimental rig is transmitted in the first installation site and the second installation site of power transmission line to be detected by coaster by lifting insulating cord, the connection of short-circuit test device and transmission line of electricity is realized by equipotential work, carries out previous work for the simulation of short-circuit test.Test efficiency can be improved in this method, does not influence route normal operation, more power transmission amounts.
Description
Technical field
This application involves project of transmitting and converting electricity debugging technique fields more particularly to a kind of livewire work to install U-shaped short-circuit test
The method of device.
Background technique
Before the project of transmitting and converting electricity of the large size such as DC engineering, series compensation, extra-high voltage project puts into operation, require to carry out defeated
The debugging efforts of electric wire, wherein man-made short-circuit's test is a most important step in debugging process.In currently existing scheme, carry out short
Road test is tested, and needs first to have a power failure to the route tested in test, when having a power failure, by short-circuit test device, such as short circuit
U-shaped frame is tested, testing position is suspended on, then carries out short-circuit test, the installation of short-circuit test device at present is in entire work
Shared time longest.
But in practical applications, since these engineerings are all important engineerings, the power of route conveying is big.If
Each short-circuit test all has a power failure to entire transmission line of electricity when carrying out, and certainly will will affect the normal operation of power grid,.In the prior art,
For the normal operation of equipment, when carrying out short-circuit test, line outage needs a large amount of supply load passing through other lines
Road carries out turning to supply, and then needs to take a long time carry out line electricity by just can be carried out line outage after complicated operation
It can turn to supply, seriously affect the efficiency of test and the normal operation of route.
In addition, carrying out man-made chamber in the prior art, the load on transmission line of electricity is more, and the electric energy carried out is needed to turn for getting over
More, even if carrying out sub-load transfer, the time for also resulting in transmission line of electricity power failure is very long.That is, how to carry out short-circuit test
When avoid having a power failure, become this field technical problem urgently to be resolved.
Summary of the invention
The application provides a kind of method that U-shaped short-circuit test device is installed in livewire work, is stopped with solving conventional method needs
Electricity influences the problem of test efficiency and route operate normally.
The application provides a kind of method that U-shaped short-circuit test device is installed in livewire work, comprising:
Determine the testing position that short-circuit test is carried out in power transmission line；
The installation site for implementing short-circuit test device on power transmission line is positioned, described device installation site includes the first installation position
It sets and the second installation site；
Using equipotential live line work mode, to first installation site and the implementation of the second installation site on the power transmission line
Winding protection；
Coaster is connected to the first installation site and the second installation site of the power transmission line using equipotential live line work mode
On；And the lifting insulating cord being mounted on experimental rig is passed through into the coaster, the end of the lifting insulating cord extends to
Ground；
In ground location by the vertical wires of experimental rig described in the lifting insulation wire saws, until the vertical wires
Contact the power transmission line；
Link position using equipotential live line work mode by the vertical wires in the power transmission line is fixed, and remove with
Lifting insulating cord, the coaster of vertical wires connection.
Optionally, to on the power transmission line first installation site and the second installation site implement winding protection
In step, the power transmission line test section is wound using aluminium armor tape, the aluminium armor tape is made to coat the first of the power transmission line
Installation site and the second installation site, the coiling length of the aluminium armor tape are 30-50cm.
Optionally, step packet coaster being connected in the first installation site and the second installation site of the power transmission line
It includes:
The coaster is connected in the first installation site and the second installation site of the power transmission line using annealed copper wire, institute
State coaster can be conductive metal material made of somersault coaster；
And the sliding by the lifting insulating cord in the coaster, the vertical wires are contacted into the coaster,
So that the vertical wires connect the power transmission line by the coaster.
Optionally, lifting insulating cord connection setting being twisted on the ground, the method are twisted driving by described
The lifting insulating cord is with two vertical wires of experimental rig described in identical speed drawing.
Optionally, in the method, the short-circuit test device is greater than or equal to operation to the distance on ground after suspension
The distance that overvoltage requires.
Optionally, in the method, two vertical wires of the experimental rig are bilateral symmetry, and the identical copper of length
Line, oversheath is had on copper wire, and horizontal component is reinforcing bar or steel pipe.
From the above technical scheme, the application provides a kind of method that U-shaped short-circuit test device is installed in livewire work, packet
Include the testing position for first determining and carrying out short-circuit test in power transmission line；Reposition the installation position for implementing short-circuit test device on power transmission line
It sets, described device installation site includes the first installation site and the second installation site；Equipotential live line work mode is used again, to described
First installation site and the second installation site on power transmission line implement winding protection；And coaster is connected to the transmission of electricity
In the first installation site and the second installation site of line；The lifting insulating cord being mounted on experimental rig is passed through into the coaster,
The end of the lifting insulating cord extends to ground；Pass through experimental rig described in lifting insulation wire saws in ground location again
Vertical wires, until the vertical wires contact the power transmission line；Finally use equipotential live line work mode by the vertical wires
It is fixed in the link position of the power transmission line, and removes lifting insulating cord, the coaster connecting with vertical wires.The application passes through
Experimental rig is transmitted to by coaster by lifting insulating cord and is installed the first of power transmission line to be detected by equipotential live line work mode
On position and the second installation site, the connection of short-circuit test device and transmission line of electricity is realized by equipotential work, is short-circuit test
Simulation carry out previous work.Test efficiency can be improved in this method, does not influence route normal operation, more power transmission amounts.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the flow diagram for the method that U-shaped short-circuit test device is installed in a kind of livewire work of the application；
Fig. 2 is a kind of structural schematic diagram of power transmission line short-circuit test system of the application.
Specific embodiment
Embodiment will be illustrated in detail below, the example is illustrated in the accompanying drawings.In the following description when referring to the accompanying drawings,
Unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Implement described in following embodiment
Mode does not represent all embodiments consistent with the application.It is only and be described in detail in claims, the application
The example of some aspects consistent line and method.
Referring to Fig. 1, the flow diagram of the method for U-shaped short-circuit test device is installed for a kind of livewire work.It can by Fig. 1
Know, a kind of method that U-shaped short-circuit test device is installed in livewire work provided by the present application, comprising the following steps:
S1: the testing position that short-circuit test is carried out in power transmission line is determined.
In technical solution provided by the present application, the U-shaped short-circuit test device is led by two vertical wires and a level
Line is constituted, and two of them vertical wires are bilateral symmetry, and the identical copper wire of length, has oversheath, horizontal component on copper wire
It is reinforcing bar or steel pipe since short-circuit test needs to make experimental rig electrification and discharges, experimental rig needs while being grounded and connecting
Power transmission line, therefore, the testing position of positioning should closer to power transmission tower, so as to carry out connection of the experimental rig on power transmission line and
Grounding.
S2: implementing the installation site of short-circuit test device on positioning power transmission line, described device installation site includes the first peace
Holding position and the second installation site.
Due to needing to carry out the connection of short-circuit test device and transmission pressure, the protection of transmission line of electricity on the transmission line,
Therefore equipotential live line work mode is used, the electric field for making operating personnel enter charging equipment directly operates, at this moment human body and electrical body
Potential difference must be close to zero.In the application, for the portal frame of anchor support or substation's outlet in transmission facility, electricity are waited
Position operating personnel can enter power transmission line test section region by insulated ladder；And when for tangent tower in transmission facility, etc.
Current potential operating personnel can enter power transmission line test section region by insulated flexible ladder.In order to obtain better charging effect, test dress
There are two vertical wires in setting, the corresponding installation site of each vertical wires, i.e. a vertical wires are for being fixed on the
One installation site, another vertical wires is for being fixed on the second installation site.
In technical solution provided by the present application, experimental rig can possess different shapes according to the actual situation, but answer
Guaranteeing the short-circuit test device after suspension, the distance to ground is greater than or equal to the distance that switching overvoltage requires, so as to
In the case where not having a power failure, subsequent test procedure can be also safely performed.
S3: equipotential live line work mode is used, to first installation site and the second installation site on the power transmission line
Implement winding protection.
During the test due to coaster, need to undertake the gravity of lifting insulating cord and experimental rig, and lifting insulation
The stress that rope is generated when pullling repeatedly, can make coaster that the coating on power transmission line surface is damaged or destroyed to power transmission line.Simultaneously
Short-circuit test moment powerful electric arc may calcination conducting wire, in order to make test process not damage the painting of power transmission line or power transmission line surface
Layer, before installing coaster, can also take power transmission line certain safeguard measure, i.e., in the section Example of the application,
Using equipotential live line work mode, after the step of positioning the power transmission line test section for implementing short-circuit test on power transmission line, the method is also
It include: that winding protection is implemented to the contact surface of the power transmission line.
In the step of implementing winding protection to the power transmission line test section, using aluminium armor tape to the power transmission line test section
It is wound, is coated on the aluminium armor tape in the first installation site and the second installation site of power transmission line, the aluminium armor tape twines
Around length be 30-50cm.In the present embodiment, protection is wound to power transmission line test section using aluminium armor tape, can not only be kept away
It is excused from an examination to test process and power transmission line surface is damaged, and the connection between coaster and power transmission line can be buffered, make to slide
Vehicle subsequent traction lift by crane insulating cord during, coaster is in stable position, so as to vertical wires can be stable contact
To split conductor.
The coaster is connected on all split conductors on the power transmission line using annealed copper wire, the coaster is by can
Conductive metal material is made；And the sliding by the lifting insulating cord in the coaster, the vertical wires are connect
The coaster is touched, so that the vertical wires connect the split conductor by the coaster.
S4: coaster is connected to the first installation site and the second installation position of the power transmission line using equipotential live line work mode
It sets；And the lifting insulating cord being mounted on experimental rig is passed through into the coaster, the end of the lifting insulating cord extends
To ground.
In the technical solution of the application, the coaster can be the somersault coaster used in high voltage transmission line or fall is sliding
Vehicle, the coaster are equipped with for across the round and smooth hole of lifting insulated wire, alloing to lift by crane insulating cord in round and smooth hole smoothly
Sliding and change direction.Coaster can be also used for conduction, i.e., the voltage in power transmission line is transmitted in experimental rig.Lifting insulation
Rope needs to be made of the preferable material of insulation performance, and has good softness and tensile strength.In this application,
Equipotential live line work personnel can be first passed through coaster is mounted on power transmission line, then will lift by crane insulating cord pass through coaster in the middle part of it is round and smooth
Hole, and the end for lifting by crane insulating cord is set on the ground, so as to subsequent carry out towage.
S5: in ground location by the vertical wires of experimental rig described in the lifting insulation wire saws, until described vertical
Power transmission line described in conductive contact.
In technical solution provided by the present application, experimental rig may include that area of section is more than 50mm2Annealed copper wire, and
With transparent oversheath.Vertical wires make vertically to lead after touching split conductor, or after touching split conductor by coaster
Line and electric transmission line equipotential, that is, charge, to generate electric discharge by voltage difference in subsequent progress short-circuit test.
S6: the link position using equipotential live line work mode by the vertical wires in the power transmission line is fixed, and is torn open
Except lifting insulating cord, the coaster being connect with vertical wires.
In technical solution provided by the present application, first short-circuit test device is led using lifting insulating cord by ground handling operator
It leads at power transmission line, then by the equipotential electrician on transmission line of electricity, experimental rig is attached with transmission line of electricity and is fixed,
Later, lifting insulating cord and test coaster are removed, to avoid the development for influencing subsequent short circuit test.In example, short-circuit test dress
The distance of the bottom set over the ground, when location of short circuit height above sea level is lower than 1000m, the distance of usual 220kV is 3m, 330kV 4m,
The length of 500kV is 5m, and the distance of 750kV is 8m, and the distance of 1000kV is 9.5m, and the distance of ± 500kV is 6.8m, ±
The distance of 660kV is 9.0m, and the distance of ± 800kV is 10.1m, as location of short circuit height above sea level high pressure 1000m, Ying Jinhang height above sea level system
Number amendment.
In addition, can guarantee whole safety in order to during lifting insulation wire saws vertical wires or striking line
Property, and keep distraction procedure more steady controllable, in the section Example of the application, the lifting insulating cord connection setting exists
Being twisted on ground, the method are twisted experimental rig described in the driving lifting insulation wire saws by described.Further,
The mode of traction of lifting insulating cord, which is passed through for both ends in symmetrical position with identical speed, to be twisted while drawing, and is before traction
Ensure safety, can be protected by metallic ground coaster before being twisted.
To realize above-mentioned installation method, the application needs to rely on power transmission line short-circuit test system, as shown in Fig. 2, described
System includes: coaster 2, for being connected to all split conductors 1 of the power transmission line test section.
U-shaped short-circuit test device 3, including vertical wires 31 and horizontal wire 32, the vertical wires 31 are for connecting institute
It states split conductor and charges.The horizontal wire 32 is used to connect the vertical wires 31 at both ends.
The one end for lifting by crane insulating cord 4 connects the vertical wires 31, and the other end extends to ground；The lifting insulating cord 4
It may pass through the coaster 2, for drawing the vertical wires 31 of the experimental rig 3, until the vertical wires 31 contact described point
Conducting wire 1 is split, to facilitate equipotential work to carry out the connection and fixation of vertical wires and transmission line of electricity.
Further, the system also includes protective devices 6, for implementing winding protection to the power transmission line test section；
The protective device 6 is the aluminium armor tape being wrapped around on the power transmission line test section.
Further, the system also includes being twisted 7, the 7 connections lifting insulating cord 4 that is twisted is close to the one of ground
End, for driving the lifting insulating cord 4 to draw the vertical wires 31 and horizontal wire 32 of the experimental rig 3.
From the above technical scheme, the application provides a kind of method that U-shaped short-circuit test device is installed in livewire work, packet
Include the testing position for first determining and carrying out short-circuit test in power transmission line；Reposition the installation position for implementing short-circuit test device on power transmission line
It sets, described device installation site includes the first installation site and the second installation site；Equipotential live line work mode is used again, to described
First installation site and the second installation site on power transmission line implement winding protection；And coaster is connected to the transmission of electricity
In the first installation site and the second installation site of line；The lifting insulating cord being mounted on experimental rig is passed through into the coaster,
The end of the lifting insulating cord extends to ground；Pass through experimental rig described in lifting insulation wire saws in ground location again
Vertical wires, until the vertical wires contact the power transmission line；Finally use equipotential live line work mode by the vertical wires
It is fixed in the link position of the power transmission line, and removes lifting insulating cord, the coaster connecting with vertical wires.
The application uses equipotential live line work mode, is transmitted to experimental rig wait open by coaster by lifting insulating cord
In the first installation site and the second installation site for opening up the power transmission line of short-circuit test, short-circuit test device is realized by equipotential work
With the connection of transmission line of electricity, previous work is carried out for the simulation of short-circuit test.Test efficiency can be improved in this method, does not influence line
Road operates normally, more power transmission amounts.
Similar portion cross-reference between embodiment provided by the present application, specific embodiment provided above is only
It is several examples under the total design of the application, does not constitute the restriction of the application protection scope.For those skilled in the art
For member, any other embodiment expanded without creative efforts according to application scheme all belongs to
In the protection scope of the application.
Claims (6)
1. a kind of method that U-shaped short-circuit test device is installed in livewire work characterized by comprising
Determine the testing position that short-circuit test is carried out in power transmission line；
Position power transmission line on implement short-circuit test device installation site, described device installation site include the first installation site and
Second installation site；
Using equipotential live line work mode, to first installation site and the implementation winding of the second installation site on the power transmission line
Protection；
Coaster is connected in the first installation site and the second installation site of the power transmission line using equipotential live line work mode；With
And the lifting insulating cord being mounted on experimental rig is passed through into the coaster, the end of the lifting insulating cord extends to ground；
In ground location by the vertical wires of experimental rig described in the lifting insulation wire saws, until the vertical wires contact
The power transmission line；
Link position using equipotential live line work mode by the vertical wires in the power transmission line is fixed, and remove with it is vertical
Lifting insulating cord, the coaster of conducting wire connection.
2. the method that U-shaped short-circuit test device is installed in livewire work according to claim 1, which is characterized in that using etc.
Current potential operation mode, on the power transmission line first installation site and the second installation site implement winding protection the step of
In, the power transmission line test section is wound using aluminium armor tape, the aluminium armor tape is made to coat the first installation of the power transmission line
Position and the second installation site, the coiling length of the aluminium armor tape are 30-50cm.
3. the method that U-shaped short-circuit test device is installed in livewire work according to claim 1, which is characterized in that using etc.
The step that coaster is connected in the first installation site and the second installation site of the power transmission line includes: by current potential operation mode
The coaster is connected in the first installation site and the second installation site of the power transmission line using annealed copper wire, the cunning
Vehicle can be conductive metal material made of somersault coaster；
And the sliding by the lifting insulating cord in the coaster, the vertical wires are contacted into the coaster, so that
The vertical wires connect the power transmission line by the coaster.
4. the method that U-shaped short-circuit test device is installed in livewire work according to claim 1, which is characterized in that described
Insulating cord connection setting being twisted on the ground is hung, the method is by the driving lifting insulating cord that is twisted with identical
Two vertical wires of experimental rig described in speed drawing.
5. the method that U-shaped short-circuit test device is installed in livewire work according to claim 1, which is characterized in that the side
In method, distance of the short-circuit test device after suspension to ground is greater than or equal to the distance that switching overvoltage requires.
6. the method that U-shaped short-circuit test device is installed in livewire work according to claim 1, which is characterized in that the side
In method, two vertical wires of the U-shaped short-circuit test device are bilateral symmetry, and the identical copper wire of length, are had on copper wire
Oversheath, horizontal component are reinforcing bar or steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811246956.4A CN109406930A (en) | 2018-10-24 | 2018-10-24 | A kind of method that U-shaped short-circuit test device is installed in livewire work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811246956.4A CN109406930A (en) | 2018-10-24 | 2018-10-24 | A kind of method that U-shaped short-circuit test device is installed in livewire work |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109406930A true CN109406930A (en) | 2019-03-01 |
Family
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| CN201811246956.4A Pending CN109406930A (en) | 2018-10-24 | 2018-10-24 | A kind of method that U-shaped short-circuit test device is installed in livewire work |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252264A (en) * | 2008-04-02 | 2008-08-27 | 云南电网公司大理供电局 | Equipotential electrical highfield hot-line working method |
| CN102623926A (en) * | 2012-03-29 | 2012-08-01 | 中国南方电网有限责任公司超高压输电公司百色局 | Distant equipotential tackle and method for realizing charged equipotential access by using same |
| CN104049158A (en) * | 2014-05-13 | 2014-09-17 | 国家电网公司 | Single-phase instant artificial grounding short-circuit test system for power transmission line |
| CN105207123A (en) * | 2015-10-13 | 2015-12-30 | 国网辽宁省电力有限公司丹东供电公司 | Equipotential operation method of tubular bus |
-
2018
- 2018-10-24 CN CN201811246956.4A patent/CN109406930A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252264A (en) * | 2008-04-02 | 2008-08-27 | 云南电网公司大理供电局 | Equipotential electrical highfield hot-line working method |
| CN102623926A (en) * | 2012-03-29 | 2012-08-01 | 中国南方电网有限责任公司超高压输电公司百色局 | Distant equipotential tackle and method for realizing charged equipotential access by using same |
| CN104049158A (en) * | 2014-05-13 | 2014-09-17 | 国家电网公司 | Single-phase instant artificial grounding short-circuit test system for power transmission line |
| CN105207123A (en) * | 2015-10-13 | 2015-12-30 | 国网辽宁省电力有限公司丹东供电公司 | Equipotential operation method of tubular bus |
Non-Patent Citations (3)
| Title |
|---|
| 《科教兴国丛书》编辑委员会编: "《中国科教论文选 3》", 31 December 1997, 北京：红旗出版社 * |
| 天津市劳动局主编: "《电工安全技术》", 31 May 1994, 天津：天津科学技术出版社 * |
| 徐少强等编著: "《供电企业现代化管理手册》", 28 February 1997, 北京：中国水利水电出版社 * |
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