CN112803314A - Live-line defect eliminating method and device for post insulator of cable terminal - Google Patents
Live-line defect eliminating method and device for post insulator of cable terminal Download PDFInfo
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- CN112803314A CN112803314A CN202110174477.1A CN202110174477A CN112803314A CN 112803314 A CN112803314 A CN 112803314A CN 202110174477 A CN202110174477 A CN 202110174477A CN 112803314 A CN112803314 A CN 112803314A
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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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/14—Supporting insulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/14—Supporting insulators
- H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
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Abstract
The method and the device for eliminating the live-line defect of the post insulator of the cable terminal determine the relative height area of the horizontal plane of the safe electric field of live-line workers according to the structural data of the post insulator to be replaced and the structural data of the cable terminal; arranging an insulating plate in the relative height area of the determined safe electric field level; and a jack is used for supporting a metal flange plate at the bottom of the cable terminal, and live-line workers carry out live-line defect eliminating operation in a protection area formed by the insulating plate. The defect elimination of live working is realized, power failure is not needed, the power supply reliability is obviously improved, a power failure application link is omitted, the working flow time is shortened, and the operation and maintenance responsiveness is obviously improved; the live-line defect elimination operation process is safe and reliable, the defect elimination device is reasonably used, the operation complexity is greatly reduced, the operation time consumption is shortened, and the efficiency of a live-line operation mode is obviously improved; the method is easy to realize operation standardization, and provides a more convenient and quicker support insulator defect eliminating means for cable operation and maintenance units.
Description
Technical Field
The invention belongs to the technical field of cable operation and maintenance, and particularly relates to a method and a device for eliminating a defect of a post insulator of a cable terminal in an electrified manner.
Background
With the expansion of urban construction scale, the overhead line in-ground migration and transformation project is expanded from the central area of the city to the periphery, so that the application of the power cable is increased year by year. Cable termination is mostly outdoor terminal, and terminal ring flange below is supported by post insulator, and this type of insulator is mostly porcelain system structure, long-term operation under outdoor various environment can lead to the damage, in case damage, will lead to cable termination slope to lead to cable fault.
To the condition that post insulator appears the defect, generally adopt the power failure to disappear and handle at present, however the power failure disappears and not only will apply for the power failure, still need lift terminal, carries out terminal level survey simultaneously, wastes time and energy. Through investigation, when a certain batch of post insulators have structural defects, after the post insulators are operated for a period of time, neutral explosion and damage can be gathered, and then a power failure and defect elimination mode is adopted, so that single-power supply of important power consumers can be caused, a power system does not meet the N-1 principle any more, and risks are brought to the reliability of power supply of a power grid.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and a device for eliminating the defect of a post insulator at a cable terminal in an electrified manner, solve the problems of long power failure application process, long consumed time in the defect elimination process, low efficiency of an operation mode and poor power supply reliability in the traditional power failure operation method, and provide a more convenient and faster means for eliminating the defect of the post insulator for a cable operation and maintenance unit.
The invention adopts the following technical scheme.
The live-line defect eliminating method of the post insulator of the cable terminal comprises the following steps:
step 1, collecting insulation tool data, induced voltage of a metal flange plate at the bottom of a cable terminal, cable terminal structure data and to-be-replaced post insulator structure data;
step 4, arranging an insulating plate in the relative height area of the horizontal plane of the safe electric field determined in the step 3;
and 5, supporting the metal flange plate at the bottom of the cable terminal by using a jack, and carrying out live-line defect elimination operation by live-line workers in a protection area formed by the insulating plate.
Preferably, the first and second electrodes are formed of a metal,
in the step 1, the method comprises the following steps of,
the insulated tool data includes: the insulation test validity period and the insulation integrity of the insulation baffle, and the insulation test validity period and the insulation integrity of the insulation wrench;
the cable termination configuration data includes: the mounting height of the umbrella skirt at the lowest part of the cable terminal insulator;
treat to change post insulator structure data and include: the mounting height of the top bolt, the mounting height of the bottom bolt and the mounting height of the bottom iron member.
The step 2 comprises the following steps:
step 2.1, checking whether the insulation baffle and the insulation wrench are within the validity period of the insulation test, and if so, meeting the requirement of live working; otherwise, the hot-line work requirement is not met;
step 2.2, checking whether the appearances of an insulating grab handle of the insulating wrench, an insulating pipe of the insulating baffle and an insulating plate of the insulating baffle are damaged or not, and if not, meeting the requirement of live working; otherwise, the hot-line work requirement is not met;
step 2.3, detecting whether the metal flange plate at the bottom of the cable terminal has induced voltage, and if the induced voltage does not exist, meeting the requirement of live working; otherwise, the hot-line work requirement is not met, and a special grounding wire is needed to be arranged so that the metal flange plate at the bottom of the cable terminal is reliably grounded.
The step 3 comprises the following steps:
step 3.1, setting the operation space size of the live working personnel;
step 3.2, determining the lower limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the size of the operation space and the installation height of the top bolt of the post insulator to be replaced by the following relational expression:
Hl＝H1+d-Hb
in the formula (I), the compound is shown in the specification,
Hla lower limit value indicating a relative height region of a safety electric field level of the live-wire worker,
H1indicating the mounting height of the top bolt of the post insulator to be replaced,
d represents the size of the operating space of the live-working person,
Hbshowing the installation height of the iron component at the bottom of the post insulator to be replaced;
and 3.3, determining the upper limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the installation height of the umbrella skirt at the lowest part of the cable terminal insulator by the following relational expression:
Hh＝H2-Hb
in the formula (I), the compound is shown in the specification,
hx represents an upper limit value of a relative height region of a safe electric field level of the live-working person,
H2showing the installation height of the umbrella skirt at the lowest part of the cable terminal insulator,
Hbindicating the mounting height of the bottom iron member of the post insulator to be replaced.
In the step 4, the insulating plate is connected with one end of the insulating tube through the overturning limiting bolt, when the overturning limiting bolt is unscrewed, the insulating tube is rotated to adjust the included angle of the insulating plate relative to the horizontal plane, and the height of the insulating plate is adjusted through the telescopic insulating tube; when the overturning limiting bolt is screwed, the insulating plate cannot rotate and the height cannot be adjusted; the other end of the insulating tube is connected with a bottom iron component of the post insulator to be replaced through a magnetic attraction switch.
Preferably, the first and second electrodes are formed of a metal,
in step 4, the arrangement of the insulating plate includes:
step 4.1, shortening the insulating tube and adjusting the insulating plate to the lowest height;
step 4.2, turning on the magnetic switch, and fixing the insulating tube at the bottom iron component of the post insulator to be replaced;
step 4.3, loosening the overturning limiting bolt, rotating the insulating tube, and adjusting the included angle of the insulating plate relative to the horizontal plane;
and 4.4, screwing the overturning limiting bolt, extending the insulating pipe, and adjusting the insulating plate to be positioned in the relative height area of the horizontal plane of the safe electric field.
The electrified defect eliminating device of the post insulator of the cable terminal comprises: the insulation board, the insulation pipe, the magnetic switch and the insulation board overturn limiting bolt;
the insulation board is connected with one end of the insulation pipe through the overturning limiting bolt, when the overturning limiting bolt is unscrewed, the insulation pipe is rotated to adjust the included angle of the insulation board relative to the horizontal plane, and the included angle ranges from 0 degree to 180 degrees; the height of the insulating plate is adjusted by stretching the insulating tube; when the overturning limiting bolt is screwed, the insulating plate cannot rotate and the height cannot be adjusted; wherein, the height of the insulating plate is adjusted by stretching the insulating tube; the height adjusting range of the insulating plate is larger than the relative height range of the horizontal plane of the safe electric field;
the other end of the insulating tube is connected with a bottom iron component of the post insulator to be replaced through a magnetic attraction switch.
Preferably, the first and second electrodes are formed of a metal,
the insulating board is half moon shape, and its insulating level is not less than the insulating level of three millimeters insulating boards.
The magnetic switch comprises a switchable strong magnetic base.
Compared with the prior art, the invention has the beneficial effects that:
1. the defect elimination of live working is realized, power failure is not needed, the power supply reliability is obviously improved, a power failure application link is omitted, the working flow time is shortened, and the operation and maintenance responsiveness is obviously improved;
2. the live-line defect elimination operation process is safe and reliable, the defect elimination device is reasonably used, the operation complexity is greatly reduced, the operation time consumption is shortened, and the efficiency of a live-line operation mode is obviously improved;
3. the method is easy to realize operation standardization, and provides a more convenient and quicker support insulator defect eliminating means for cable operation and maintenance units.
Drawings
FIG. 1 is a flow chart of an electrified defect removal method for a post insulator of a cable terminal according to the present invention;
FIG. 2 is a schematic view of a double-sided ratchet insulating wrench used in the live-line defect-eliminating operation of the post insulator of the cable terminal according to the present invention;
FIG. 3 is a front view of a magnetic adjustable half-moon-shaped insulating baffle used in the live-line defect-eliminating operation of the post insulator of the cable terminal of the present invention;
FIG. 4 is a top view of a magnetic adjustable half-moon-shaped insulating baffle used in the live-line defect-eliminating operation of the cable terminal post insulator of the present invention;
fig. 5 is a schematic view of a miniaturized mechanical jack used in the live-line defect-eliminating operation of the post insulator of the cable terminal of the present invention.
Reference is made to figures 2 to 5 of the accompanying drawings:
1: a double-sided ratchet wrench; 2: an insulated handle of the wrench; 3: a miniaturized mechanical jack;
4: an insulating wrench special for a jack; 5: an insulating tube; 6: an insulating plate;
7: a post insulator top bolt; 8: a steel plate; 9: to-be-replaced post insulators, 10: a post insulator bottom iron member, which in the preferred embodiment is a channel steel;
11: a switchable ferromagnetic base; 12: the insulating baffle overturns the spacing bolt.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Referring to fig. 1, the live-line defect eliminating method for the post insulator of the cable terminal comprises the following steps:
step 1, collecting insulation tool data, induced voltage of a metal flange plate at the bottom of a cable terminal, cable terminal structure data and post insulator structure data to be replaced.
In particular, the amount of the solvent to be used,
in the step 1, the method comprises the following steps of,
the insulated tool data includes: the insulation test validity period and the insulation integrity of the insulation baffle, and the insulation test validity period and the insulation integrity of the insulation wrench;
the cable termination configuration data includes: the mounting height of the umbrella skirt at the lowest part of the cable terminal insulator;
treat to change post insulator structure data and include: the mounting height of the top bolt, the mounting height of the bottom bolt and the mounting height of the bottom iron member.
And 2, detecting the special tool data acquired in the step 1 and the induced voltage of the metal flange plate at the bottom of the cable terminal so as to meet the requirement of live working.
In particular, the amount of the solvent to be used,
the step 2 comprises the following steps:
step 2.1, checking whether the insulation baffle and the insulation wrench are within the validity period of the insulation test, and if so, meeting the requirement of live working; otherwise, the hot-line work requirement is not met.
In the preferred embodiment, as shown in fig. 2 and 3, the insulating wrench is a double-faced ratchet insulating wrench, and the insulating baffle is a magnetic adjustable half-moon-shaped insulating baffle device. Before operation, whether the magnetic suction adjustable half-moon-shaped insulating baffle device and the double-sided ratchet wheel insulating wrench are in the test validity period or not is detected.
Step 2.2, checking whether the appearances of an insulating grab handle of the insulating wrench, an insulating pipe of the insulating baffle and an insulating plate of the insulating baffle are damaged or not, and if not, meeting the requirement of live working; otherwise, the hot-line work requirement is not met.
In the preferred embodiment, as shown in fig. 2, whether the appearance of the insulating handle 2 of the double-sided ratchet insulating wrench 1 is damaged or not is detected; as shown in fig. 3, it is also required to detect whether the appearance of the insulating tube 5 and the insulating plate 6 of the magnetic adjustable half-moon-shaped insulating baffle device is damaged; since the above-mentioned components play a role of insulation protection for the live working personnel, if abnormality is detected, the use must be prohibited.
Step 2.3, detecting whether the metal flange plate at the bottom of the cable terminal has induced voltage, and if the induced voltage does not exist, meeting the requirement of live working; otherwise, the hot-line work requirement is not met, and a special grounding wire is needed to be arranged so that the metal flange plate at the bottom of the cable terminal is reliably grounded.
In the preferred embodiment, the live-line defect elimination of the post insulator of the cable terminal adopts a ground potential operation mode, so that before operation, a grounding piece of a metal flange plate at the bottom of the cable terminal to be eliminated needs to be reliably grounded, and if the grounding is unreliable, certain induced voltage exists on the metal flange plate, so that the safety of operators is threatened, and the cable terminal is reliably grounded by using a special grounding wire.
And 3, determining the relative height area of the horizontal plane of the safe electric field of the live working personnel according to the structural data of the post insulator to be replaced and the structural data of the cable terminal.
In particular, the amount of the solvent to be used,
the step 3 comprises the following steps:
and 3.1, setting the size of the operation space of the live working personnel.
In the preferred embodiment, the live-working personnel firstly steps the pole to the operating platform below the cable terminal to be eliminated, then hangs the rope ladder on the iron component 10 at the bottom of the post insulator 9 to be replaced as shown in fig. 3, and then transfers the live-working personnel to the rope ladder; under the condition of ensuring the hand stretching state, when live working personnel can utilize the operation of the double-sided ratchet wrench to wait to replace the top bolt 7 of the post insulator, the working personnel stops at the position, and at the moment, the working personnel can completely unscrew the top bolt 7 of the post insulator to be replaced and needs a certain operation space.
Step 3.2, determining the lower limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the size of the operation space and the installation height of the top bolt of the post insulator to be replaced by the following relational expression:
Hl＝H1+d-Hb
in the formula (I), the compound is shown in the specification,
Hla lower limit value indicating a relative height region of a safety electric field level of the live-wire worker,
H1indicating the mounting height of the top bolt of the post insulator to be replaced,
d represents the size of the operating space of the live-working person,
Hbshowing the installation height of the iron component at the bottom of the post insulator to be replaced;
and 3.3, determining the upper limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the installation height of the umbrella skirt at the lowest part of the cable terminal insulator by the following relational expression:
Hh＝H2-Hb
in the formula (I), the compound is shown in the specification,
Hhan upper limit value representing a relative height area of a safety electric field level of the live-wire worker,
H2showing the installation height of the umbrella skirt at the lowest part of the cable terminal insulator,
Hbindicating the mounting height of the bottom iron member of the post insulator to be replaced.
In the preferred embodiment of the present invention, the lower limit value of the relative height area of the safety electric field level of the live working personnel, which is determined in step 3.2, is actually to ensure that the insulating plate 6 does not obstruct the operation of the working personnel; and 3.3, actually ensuring that the insulating plate 6 does not exceed the umbrella skirt at the lowest part of the cable terminal insulator.
Therefore, the height of the insulating plate 6 can be appropriately reduced without hindering the operation of the operator.
And 4, arranging an insulating plate in the relative height area of the horizontal plane of the safe electric field determined in the step 3.
In particular, the amount of the solvent to be used,
in step 4, as shown in fig. 3 and 4, the insulating plate 6 is connected with one end of the insulating tube 5 through the turnover limiting pin 12, when the turnover limiting pin 12 is unscrewed, the insulating tube 5 is rotated to adjust the included angle of the insulating plate 6 relative to the horizontal plane, and the insulating tube 5 is stretched to adjust the height of the insulating plate 6; when the overturning limiting bolt 12 is screwed, the insulating plate cannot rotate and the height cannot be adjusted; the other end of the insulating tube 5 is connected to the bottom iron member 10 of the post insulator 9 to be replaced by a magnetic switch 11.
In step 4, the arrangement of the insulating plate 6 includes:
step 4.1, shortening the insulating tube 5 and adjusting the insulating plate 6 to the lowest height;
step 4.2, turning on the magnetic switch 11, and fixing the insulating tube 5 at the bottom iron member 10 of the post insulator 9 to be replaced;
step 4.3, loosening the overturning limiting bolt 12, rotating the insulating tube 5, and adjusting the included angle of the insulating plate 6 relative to the horizontal plane;
and 4.4, screwing the overturning limiting bolt 12, extending the insulating tube 5, and adjusting the insulating plate 6 to be positioned in the relative height area of the horizontal plane of the safe electric field.
In the preferred embodiment of the invention, the insulating plate 6 in the magnetic adjustable half-moon-shaped insulating baffle device is arranged in the relative height area of the horizontal plane of the safe electric field, and the standardized operation flow is as follows:
(1) loosening the overturning limiting bolt 12, shortening the insulating tube 5, adjusting the height of the insulating plate 6 to be in the lowest state, integrally placing the magnetic adjustable half-moon-shaped insulating baffle device at a proper position of the iron component 10 at the bottom of the post insulator 9 to be replaced, and opening the switchable strong magnetic seat 11 to fix the magnetic adjustable half-moon-shaped insulating baffle on the iron component 10;
(2) rotating the insulating tube 5, adjusting the insulating plate 6 to a proper angle, extending the insulating tube 5, gradually lifting the insulating plate 6 to the umbrella skirt at the lowest part of the cable terminal insulator, and screwing the overturning limiting bolt 12;
(3) the top bolt and the bottom bolt of the post insulator 9 to be replaced are loosened by 1 circle by using the double-sided ratchet wrench 1.
And 5, supporting the metal flange plate at the bottom of the cable terminal by using a jack, and carrying out live-line defect elimination operation by live-line workers in a protection area formed by the insulating plate.
In the preferred embodiment of the present invention, as shown in fig. 5, the jack is used to support the metal flange at the bottom of the cable terminal for live-line defect elimination, and the standardized operation flow is as follows:
(1) placing the miniaturized mechanical jack 3 on the same side of the post insulator 9 to be replaced, adjusting the height of the miniaturized mechanical jack 3 by using the special insulating wrench 4 for the jack, and supporting a metal flange above the post insulator 9 to be replaced until the miniaturized mechanical jack 3 is completely stressed;
(2) completely unscrewing the top bolt and the bottom bolt of the post insulator 9 to be replaced by using the double-sided ratchet wrench 1, taking down the post insulator 9 to be replaced, replacing a new insulator and fastening;
(3) after the top bolt and the bottom bolt of the newly-installed post insulator are completely screwed, the miniaturized mechanical jack 3 is removed, and the pressure is transferred to the newly-installed post insulator;
(4) loosening the overturning limiting bolt 12, shortening the insulating tube 5 to the lowest point, screwing the overturning limiting bolt 12, closing the switchable strong magnetic seat 11, and removing the magnetic adjustable half-moon-shaped insulating baffle device;
(5) and cleaning the working site.
As shown in fig. 3 and 4, the live-wire deletion apparatus for a post insulator of a cable termination includes: insulation board 6, insulating tube 5, magnetism switch 11, insulation board upset limit pin 12 of inhaling.
The insulation board 6 is connected with one end of the insulation pipe 5 through the overturning limiting bolt 12, when the overturning limiting bolt 12 is unscrewed, the insulation pipe 5 is rotated to adjust the included angle of the insulation board 6 relative to the horizontal plane, and the included angle ranges from 0 degree to 180 degrees; and the height of the insulating plate 6 is adjusted by stretching the insulating tube 5; when the overturning limiting bolt 12 is screwed, the insulating plate 6 cannot rotate and cannot adjust the height; wherein, the height of the insulating plate 6 is adjusted by stretching the insulating tube 5; the height adjustment range of the insulating plate 6 is larger than the relative height range of the horizontal plane of the safe electric field.
The other end of the insulating tube 4 is connected to the bottom iron member 10 of the post insulator 9 to be replaced by a magnetic switch 11.
In particular, the amount of the solvent to be used,
the insulating plate 6 is half-moon-shaped, and the insulating level of the insulating plate is not lower than that of a three-millimeter insulating plate. In the preferred embodiment of the invention, the three mm insulating panel 6 is used to protect the operator from the height of the hands not exceeding the safe electric field level, so that an insulating panel equal to or higher than the insulating level of the device can be used.
The magnetic switch 11 includes but is not limited to a switchable ferromagnetic seat.
Compared with the prior art, the invention has the beneficial effects that:
1. the defect elimination of live working is realized, power failure is not needed, the power supply reliability is obviously improved, a power failure application link is omitted, the working flow time is shortened, and the operation and maintenance responsiveness is obviously improved;
2. the live-line defect elimination operation process is safe and reliable, the defect elimination device is reasonably used, the operation complexity is greatly reduced, the operation time consumption is shortened, and the efficiency of a live-line operation mode is obviously improved;
3. the method is easy to realize operation standardization, and provides a more convenient and quicker support insulator defect eliminating means for cable operation and maintenance units.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (9)
1. An electrified defect eliminating method for a post insulator of a cable terminal is characterized in that,
the charged defect eliminating method comprises the following steps:
step 1, collecting insulation tool data, induced voltage of a metal flange plate at the bottom of a cable terminal, cable terminal structure data and to-be-replaced post insulator structure data;
step 2, detecting the special tool data collected in the step 1 and the induced voltage of the metal flange plate at the bottom of the cable terminal so as to meet the requirement of live working;
step 3, determining a relative height area of a safety electric field horizontal plane of the live working personnel according to the structural data of the post insulator to be replaced and the structural data of the cable terminal;
step 4, arranging an insulating plate in the relative height area of the horizontal plane of the safe electric field determined in the step 3;
and 5, supporting the metal flange plate at the bottom of the cable terminal by using a jack, and carrying out live-line defect elimination operation by live-line workers in a protection area formed by the insulating plate.
2. The live-wire deletion method of a cable termination post insulator according to claim 1,
in the step 1, the method comprises the following steps of,
the insulated tool data includes: the insulation test validity period and the insulation integrity of the insulation baffle, and the insulation test validity period and the insulation integrity of the insulation wrench;
the cable termination configuration data includes: the mounting height of the umbrella skirt at the lowest part of the cable terminal insulator;
treat to change post insulator structure data and include: the mounting height of the top bolt, the mounting height of the bottom bolt and the mounting height of the bottom iron member.
3. Method for live deletion of a post insulator of a cable termination according to claims 1 and 2,
the step 2 comprises the following steps:
step 2.1, checking whether the insulation baffle and the insulation wrench are within the validity period of the insulation test, and if so, meeting the requirement of live working; otherwise, the hot-line work requirement is not met;
step 2.2, checking whether the appearances of an insulating grab handle of the insulating wrench, an insulating pipe of the insulating baffle and an insulating plate of the insulating baffle are damaged or not, and if not, meeting the requirement of live working; otherwise, the hot-line work requirement is not met;
step 2.3, detecting whether the metal flange plate at the bottom of the cable terminal has induced voltage, and if the induced voltage does not exist, meeting the requirement of live working; otherwise, the hot-line work requirement is not met, and a special grounding wire is needed to be arranged so that the metal flange plate at the bottom of the cable terminal is reliably grounded.
4. Method for live deletion of a post insulator of a cable termination according to claims 1 and 2,
the step 3 comprises the following steps:
step 3.1, setting the operation space size of the live working personnel;
step 3.2, determining the lower limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the size of the operation space and the installation height of the top bolt of the post insulator to be replaced by the following relational expression:
Hl＝H1+d-Hb
in the formula (I), the compound is shown in the specification,
Hla lower limit value indicating a relative height region of a safety electric field level of the live-wire worker,
H1indicating the mounting height of the top bolt of the post insulator to be replaced,
d represents the size of the operating space of the live-working person,
Hbshowing the installation height of the iron component at the bottom of the post insulator to be replaced;
and 3.3, determining the upper limit value of the relative height area of the safety electric field horizontal plane of the live working personnel according to the installation height of the umbrella skirt at the lowest part of the cable terminal insulator by the following relational expression:
Hh＝H2-Hb
in the formula (I), the compound is shown in the specification,
Hhan upper limit value representing a relative height area of a safety electric field level of the live-wire worker,
H2showing the installation height of the umbrella skirt at the lowest part of the cable terminal insulator,
Hbindicating the mounting height of the bottom iron member of the post insulator to be replaced.
5. The live-wire deletion method of a cable termination post insulator according to claim 1,
in the step 4, the insulating plate is connected with one end of the insulating tube through the turnover limiting bolt, when the turnover limiting bolt is unscrewed, the insulating tube is rotated to adjust the included angle of the insulating plate relative to the horizontal plane, and the height of the insulating plate is adjusted through the telescopic insulating tube; when the overturning limiting bolt is screwed, the insulating plate cannot rotate and the height cannot be adjusted;
the other end of the insulating tube is connected with a bottom iron component of the post insulator to be replaced through a magnetic attraction switch.
6. The live-wire deletion method of a cable termination post insulator according to claim 5,
in step 4, the arrangement of the insulating plate includes:
step 4.1, shortening the insulating tube and adjusting the insulating plate to the lowest height;
step 4.2, turning on the magnetic switch, and fixing the insulating tube at the bottom iron component of the post insulator to be replaced;
step 4.3, loosening the overturning limiting bolt, rotating the insulating tube, and adjusting the included angle of the insulating plate relative to the horizontal plane;
and 4.4, screwing the overturning limiting bolt, extending the insulating pipe, and adjusting the insulating plate to be positioned in the relative height area of the horizontal plane of the safe electric field.
7. Live-wire deletion device for use in a live-wire deletion method for a cable termination post insulator according to claims 1 to 6,
the electrified defect eliminating device comprises: the insulation board, the insulation pipe, the magnetic switch and the insulation board overturn limiting bolt;
the insulation board is connected with one end of the insulation pipe through the overturning limiting bolt, when the overturning limiting bolt is unscrewed, the insulation pipe is rotated to adjust the included angle of the insulation board relative to the horizontal plane, and the included angle ranges from 0 degree to 180 degrees; the height of the insulating plate is adjusted by stretching the insulating tube; when the overturning limiting bolt is screwed, the insulating plate cannot rotate and the height cannot be adjusted; wherein, the height of the insulating plate is adjusted by stretching the insulating tube; the height adjusting range of the insulating plate is larger than the relative height range of the horizontal plane of the safe electric field;
the other end of the insulating tube is connected with a bottom iron component of the post insulator to be replaced through a magnetic attraction switch.
8. The live cable termination post insulator deletion apparatus of claim 7,
the insulating plate is half-moon-shaped, and the insulating level of the insulating plate is not lower than that of the three-millimeter insulating plate.
9. The live cable termination post insulator deletion apparatus of claim 7,
the magnetic switch comprises a switchable strong magnetic base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174477.1A CN112803314B (en) | 2021-02-07 | 2021-02-07 | Live-line defect eliminating method and device for post insulator of cable terminal |
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| CN202110174477.1A CN112803314B (en) | 2021-02-07 | 2021-02-07 | Live-line defect eliminating method and device for post insulator of cable terminal |
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| CN112803314B CN112803314B (en) | 2022-06-21 |
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Citations (7)
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| JP2009009748A (en) * | 2007-06-26 | 2009-01-15 | Chugoku Electric Power Co Inc:The | Electric wire connecting device |
| US20130269180A1 (en) * | 2010-12-28 | 2013-10-17 | Hebei Electric Power Maintenance Company | Maintenance tool for insulator of direct current transmission line |
| CN106169718A (en) * | 2016-09-29 | 2016-11-30 | 国网江苏省电力公司南京供电公司 | One can charged for replacement cable termination support insulator support means |
| CN106848921A (en) * | 2017-02-15 | 2017-06-13 | 河海大学 | A kind of livewire work method of ultra-high-tension power transmission line |
| CN206640205U (en) * | 2017-04-07 | 2017-11-14 | 国家电网公司 | R types spring pin ground potential plug device at 66kV straight line pole bowl heads |
| CN211908196U (en) * | 2020-05-27 | 2020-11-10 | 中铁电气化局集团有限公司 | Insulator replacing device |
| CN112217143A (en) * | 2020-11-13 | 2021-01-12 | 云南电网有限责任公司带电作业分公司 | Operation method for replacing composite insulator in high-altitude area in 500kV line in live mode |
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2021
- 2021-02-07 CN CN202110174477.1A patent/CN112803314B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009009748A (en) * | 2007-06-26 | 2009-01-15 | Chugoku Electric Power Co Inc:The | Electric wire connecting device |
| US20130269180A1 (en) * | 2010-12-28 | 2013-10-17 | Hebei Electric Power Maintenance Company | Maintenance tool for insulator of direct current transmission line |
| CN106169718A (en) * | 2016-09-29 | 2016-11-30 | 国网江苏省电力公司南京供电公司 | One can charged for replacement cable termination support insulator support means |
| CN106848921A (en) * | 2017-02-15 | 2017-06-13 | 河海大学 | A kind of livewire work method of ultra-high-tension power transmission line |
| CN206640205U (en) * | 2017-04-07 | 2017-11-14 | 国家电网公司 | R types spring pin ground potential plug device at 66kV straight line pole bowl heads |
| CN211908196U (en) * | 2020-05-27 | 2020-11-10 | 中铁电气化局集团有限公司 | Insulator replacing device |
| CN112217143A (en) * | 2020-11-13 | 2021-01-12 | 云南电网有限责任公司带电作业分公司 | Operation method for replacing composite insulator in high-altitude area in 500kV line in live mode |
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| CN112803314B (en) | 2022-06-21 |
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