CN114221255A - +/-800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus-bar wire-lifting clamp - Google Patents
+/-800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus-bar wire-lifting clamp Download PDFInfo
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- CN114221255A CN114221255A CN202111425301.5A CN202111425301A CN114221255A CN 114221255 A CN114221255 A CN 114221255A CN 202111425301 A CN202111425301 A CN 202111425301A CN 114221255 A CN114221255 A CN 114221255A
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- fixture
- clamp
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- high voltage
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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
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention discloses a +/-800 kV extra-high voltage direct current line live-line operation squirrel-cage type tubular bus-bar wire-lifting clamp which comprises a wire-lifting clamp body, a clamp fixing cover, a clamp turnover cover, a connecting lug, a butt-joint groove, a butt-joint bump, a fastening bolt and an insulating pull rod. The invention has the beneficial effects that: the fixture fixing cover and the fixture turning cover of the elevator wire clamp body are both made of titanium alloy materials in a die-casting mode, so that the elevator wire clamp is lighter and more portable under the condition of guaranteeing load; the butt joint convex block is clamped in the butt joint groove and fixedly connected with the butt joint concave block through a fastening bolt penetrating through the arranged through hole so as to realize the connection and fixation of the fixture fixing cover and the fixture turnover cover and facilitate operation and construction; for the design of the fixture, strength calculation, bending stress calculation and shearing stress calculation are carried out, the fixture can be ensured to work safely when the working load is 50KN, and 2.5 times of safety factor can be ensured.
Description
Technical Field
The invention relates to a pipe bus lifting wire clamp, in particular to a mouse cage type pipe bus lifting wire clamp for hot-line work of a +/-800 kV extra-high voltage direct current line and a design method thereof, and belongs to the technical field of power transmission network line construction clamps.
Background
The +/-800 kilovolt high-voltage direct-current transmission line has the main characteristics that with the rapid development of an ultra-high voltage power grid in China, the construction of a trans-regional and ultra-high voltage power grid and the long-distance transmission of electric energy become the main characteristics in the development process of the power grid in China, and the ultra-high voltage transmission is a social promise of providing clean energy for national grid companies, so that the harmonious development of society, enterprises and environment is achieved.
The hot-line work of the +/-800 kV extra-high voltage direct-current line in the high-altitude heavy ice area is a supplement to the hot-line work of the conventional extra-high voltage line, and the blank of the hot-line work in the area in China is filled. The safety of extra-high voltage direct current live working is guaranteed, the line maintenance efficiency is improved, and the health level of equipment is guaranteed to play a huge role. Secondly, the application of the live working technology can greatly reduce the power failure hours of the extra-high voltage direct current line, improve the availability ratio of the line and ensure the economical and reliable operation of the line.
And when the extra-high voltage direct current line operation is constructed, the line needs to be lifted through the fixture, the existing pipe bus line lifting fixture is not convenient to operate and use, in addition, the production design of the fixture is ensured to be accurately stressed and stress is calculated, and further the fixture can not be safely constructed and used when the working load is 50 KN.
Disclosure of Invention
The invention aims to provide a mouse cage type tubular bus-bar cable clamp for hot-line work of a +/-800 kV extra-high voltage direct current line in order to solve the problem.
The invention realizes the purpose through the following technical scheme: a + -800 kV ultra-high voltage DC line live-line work squirrel-cage type bus-bar line-lifting clamp comprises
The wire lifting clamp body is in an annular squirrel cage type and consists of two symmetrically arranged clamp fixing covers and a clamp turnover cover, and the clamp fixing covers are positioned at the upper ends of the clamp turnover covers;
the butt joint assembly is arranged at the joint of the fixture fixing cover and the fixture turnover cover and consists of butt joint grooves which are respectively arranged at two ends of the fixture fixing cover and butt joint lugs which are respectively and fixedly connected with two ends of the fixture turnover cover;
and the lifting assembly is used for lifting the wire lifting clamp body, and consists of a connecting lug fixedly welded at the middle part of the upper end of the clamp fixing cover and an insulating pull rod vertically connected to the connecting lug.
As a still further scheme of the invention: the fixture fixing cover and the fixture turning cover of the elevator wire clamp body are made of titanium alloy materials in a die-casting mode.
As a still further scheme of the invention: the butt joint convex block is clamped in the butt joint groove, and the butt joint convex block and the butt joint groove are fixedly connected through a fastening bolt penetrating through the arranged through hole.
As a still further scheme of the invention: the inner side surfaces of the fixture fixing cover and the fixture turnover cover are both in a semicircular cambered surface structure.
As a still further scheme of the invention: the two ends of the fixture fixing cover and the fixture turning cover are arc-surface-shaped.
A squirrel-cage tubular bus lifter wire for the hot-line work of a +/-800 kV extra-high voltage direct current line is designed by the following steps
Selecting materials, namely selecting titanium alloy materials for preparation according to the 50KN working load to be borne, wherein the design parameter is sigmas＝824Mpa、σb902MPa, and the center distance of the fixture is 212 mm;
step two, calculating the strength of the section, and cutting the section with the length of 60mm and the width of 30 mm;
the section inertia moment is as follows: i isY＝ab3/12＝135000mm4
The flexural section modulus of the section is W ═ ab2/6＝9000mm3
Step three, the bending moment applied to the section is as follows:
M＝(P/2)×96＝(50000/2)×96×2.5＝6000000N.mm
the bending stress on the section is then:
σ＝M/W
σ＝667Mpa<σs＝824Mpa
step four, calculating the section of the lug at the top end of the fixture, and intercepting the circular hole with the inner diameter of 21mm and the width of 20mm from the center of the circular hole to the top end of 30 mm;
the shear plane area A is (30-21/2) × 20 is 390mm2
The shearing force is P/2-5000/2-2500 Kg.
So that the shear stress is deltaScissors＝2500/390＝64.1MPa
Taking the safety factor as 2.5, the allowable shear stress of TC4 is:
δlicense plate＝824×0.6/2.5＝197.76MPa>δScissors＝64.1MPa
And step five, analyzing results, and according to the calculated numerical value, when the work load of the fixture main body is 50KN, the fixture main body is safe to work, and the safety factor of 2.5 times can be guaranteed, namely the fixture main body can be prepared according to the design.
The invention has the beneficial effects that:
1. the fixture fixing cover and the fixture turning cover of the elevator wire clamp body are both made of titanium alloy materials in a die-casting mode, so that the elevator wire clamp is lighter and more portable under the condition of guaranteeing load;
2. the butt joint convex block is clamped in the butt joint groove and fixedly connected with the butt joint concave block through a fastening bolt penetrating through the arranged through hole so as to realize the connection and fixation of the fixture fixing cover and the fixture turnover cover and facilitate operation and construction;
3. the inner side surfaces of the fixture fixing cover and the fixture turnover cover are both in a semicircular cambered surface structure, and can be attached to the outer surface of the pipe nut when being connected with the pipe nut, so that indentation abrasion of the pipe nut is avoided;
4. for the design of the fixture, strength calculation, bending stress calculation and shearing stress calculation are carried out, the fixture can be ensured to work safely when the working load is 50KN, and 2.5 times of safety factor can be ensured.
Drawings
FIG. 1 is a schematic front view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the overall structure of the present invention;
FIG. 3 is a structural diagram of the opening state of the poppet valve body according to the present invention;
FIG. 4 is a schematic structural view of a closed state of a poppet valve body according to the present invention;
fig. 5 is a side view of the cover of the fixture of the present invention.
In the figure: 1. the wire lifting clamp comprises a wire lifting clamp body, 2, a clamp fixing cover, 3, a clamp turnover cover, 4, a connecting lug, 5, a butt joint groove, 6, a butt joint lug, 7, a fastening bolt, 8 and an insulating pull rod.
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. 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.
Example one
Referring to fig. 1 to 5, a + -800 kV extra-high voltage DC line live-line mouse cage type bus-bar wire-lifting card comprises
The clamp comprises a clamp body 1, a clamping device cover 3 and a clamping device fixing cover 2, wherein the clamp body 1 is in an annular squirrel-cage shape and consists of two symmetrically arranged clamping device fixing covers 2 and the clamping device cover 3, and the clamping device fixing covers 2 are positioned at the upper ends of the clamping device cover 3;
the butt joint component is arranged at the joint of the fixture fixing cover 2 and the fixture turnover cover 3 and consists of butt joint grooves 5 which are respectively arranged at two ends of the fixture fixing cover 2 and butt joint lugs 6 which are respectively and fixedly connected with two ends of the fixture turnover cover 3;
and the lifting assembly is used for lifting the wire lifting clamp body 1, and consists of a connecting lug 4 fixedly welded at the middle part of the upper end of the clamp fixing cover 2 and an insulating pull rod 8 vertically connected to the connecting lug 4.
In the embodiment of the invention, the fixture fixing cover 2 and the fixture turning cover 3 of the wire clamp body 1 are both made of titanium alloy materials through die casting, so that the wire clamp is more portable under the condition of ensuring load.
In the embodiment of the invention, the butt-joint projection 6 is clamped in the butt-joint groove 5, and the butt-joint projection and the butt-joint groove are fixedly connected through the fastening bolt 7 passing through the arranged through hole, so that the fixture fixing cover 2 and the fixture turnover cover 3 are fixedly connected, and the operation and the construction are convenient.
In the embodiment of the invention, the inner side surfaces of the fixture fixing cover 2 and the fixture turnover cover 3 are both in a semicircular cambered surface structure, and can be attached to the outer surface of the pipe nut when being connected with the pipe nut, so that indentation abrasion of the pipe nut is avoided.
In the embodiment of the invention, the two ends of the fixture fixing cover 2 and the fixture turning cover 3 are arc-surface-shaped, so that sharp corner extrusion on the hand of an operator can not be caused in the construction process, and the safety in construction is ensured.
Example two
A + -800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus lifter wire is designed by the following steps:
selecting materials, namely selecting titanium alloy materials for preparation according to the 50KN working load to be borne, wherein the design parameter is sigmas＝824Mpa、σb902MPa, and the center distance of the fixture is 212 mm;
step two, calculating the strength of the section, and cutting the section with the length of 60mm and the width of 30 mm;
the section inertia moment is as follows: i isY＝ab3/12＝135000mm4
The flexural section modulus of the section is W ═ ab2/6＝9000mm3
Step three, the bending moment applied to the section is as follows:
M＝(P/2)×96＝(50000/2)×96×2.5＝6000000N.mm
the bending stress on the section is then:
σ＝M/W
σ＝667Mpa<σs＝824Mpa
step four, calculating the section of the lug at the top end of the fixture, and intercepting the circular hole with the inner diameter of 21mm and the width of 20mm from the center of the circular hole to the top end of 30 mm;
the shear plane area A is (30-21/2) × 20 is 390mm2
The shearing force is P/2-5000/2-2500 Kg.
So that the shear stress is deltaScissors＝2500/390＝64.1MPa
Taking the safety factor as 2.5, the allowable shear stress of TC4 is:
δlicense plate＝824×0.6/2.5＝197.76MPa>δScissors＝64.1MPa
And step five, analyzing results, and according to the calculated numerical value, when the work load of the fixture main body is 50KN, the fixture main body is safe to work, and the safety factor of 2.5 times can be guaranteed, namely the fixture main body can be prepared according to the design.
The working principle is as follows: adopt the fixed lid of fixture 2 of semicircle form and fixture flip 3 to connect in the female outside of pipe, and put the butt joint lug 6 card of junction in butt joint recess 5, and pass the through-hole of seting up through fastening bolt 7 between the two and carry out fixed connection, in order to realize fixed lid 2 and fixture flip 3's connection fixed to fixture, and be convenient for operation and construction, simultaneously to the design of this fixture, carry out intensity calculation, bending stress calculates and shear stress calculates, ensure that the fixture of design can be when work load is 50KN, work is safe, and can guarantee 2.5 times's factor of safety.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. 800kV extra-high voltage direct current line live working squirrel-cage type tubular bus lifter card, its characterized in that: comprises that
The wire lifting clamp comprises a wire lifting clamp body (1) which is in an annular squirrel cage shape and consists of two clamp fixing covers (2) and a clamp turnover cover (3), wherein the two clamp fixing covers are symmetrically arranged, and the clamp fixing covers (2) are positioned at the upper ends of the clamp turnover covers (3);
the butt joint assembly is arranged at the joint of the fixture fixing cover (2) and the fixture turnover cover (3) and consists of butt joint grooves (5) which are respectively formed at two ends of the fixture fixing cover (2) and butt joint lugs (6) which are respectively and fixedly connected with two ends of the fixture turnover cover (3);
the lifting assembly is used for lifting and hoisting the wire lifting clamp body (1) and consists of a connecting lug (4) fixedly welded at the middle part of the upper end of the clamp fixing cover (2) and an insulating pull rod (8) vertically connected to the connecting lug (4).
2. The + -800 kV extra-high voltage direct current line live working squirrel-cage tubular bus-bar cable clamp of claim 1, wherein: the fixture fixing cover (2) and the fixture turning cover (3) of the wire lifting clamp body (1) are both made of titanium alloy materials through die casting.
3. The + -800 kV extra-high voltage direct current line live working squirrel-cage tubular bus-bar cable clamp of claim 1, wherein: the butt joint convex block (6) is clamped in the butt joint groove (5), and the butt joint convex block and the butt joint groove are fixedly connected through a fastening bolt (7) penetrating through the arranged through hole.
4. The + -800 kV extra-high voltage direct current line live working squirrel-cage tubular bus-bar cable clamp of claim 1, wherein: the inner side surfaces of the fixture fixing cover (2) and the fixture turnover cover (3) are both in a semicircular cambered surface structure.
5. The + -800 kV extra-high voltage direct current line live working squirrel-cage tubular bus-bar cable clamp of claim 1, wherein: the two ends of the fixture fixing cover (2) and the fixture turning cover (3) are arc-surface-shaped.
6. The design method of the mouse cage type tubular bus lifter clamp for the hot-line work of the +/-800 kV extra-high voltage direct current line based on the claim 1 is characterized by comprising the following steps: the design method comprises the following steps
Selecting materials, namely selecting titanium alloy materials for preparation according to the 50KN working load to be borne, wherein the design parameter is sigmas＝824Mpa、σb902MPa, and the center distance of the fixture is 212 mm;
step two, calculating the strength of the section, and cutting the section with the length of 60mm and the width of 30 mm;
the section inertia moment is as follows: i isY＝ab3/12＝135000mm4
The flexural section modulus of the section is W ═ ab2/6＝9000mm3
Step three, the bending moment applied to the section is as follows:
M＝(P/2)×96＝(50000/2)×96×2.5＝6000000N.mm
the bending stress on the section is then:
σ＝M/W
σ＝667Mpa<σs＝824Mpa
step four, calculating the section of the lug at the top end of the fixture, and intercepting the circular hole with the inner diameter of 21mm and the width of 20mm from the center of the circular hole to the top end of 30 mm;
the shear plane area A is (30-21/2) × 20 is 390mm2
The shearing force is P/2-5000/2-2500 Kg
So that the shear stress is deltaScissors＝2500/390＝64.1MPa
Taking the safety factor as 2.5, the allowable shear stress of TC4 is:
δlicense plate＝824×0.6/2.5＝197.76MPa>δScissors＝64.1MPa
And step five, analyzing results, and according to the calculated numerical value, when the work load of the fixture main body is 50KN, the fixture main body is safe to work, and the safety factor of 2.5 times can be guaranteed, namely the fixture main body can be prepared according to the design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111425301.5A CN114221255A (en) | 2021-11-26 | 2021-11-26 | +/-800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus-bar wire-lifting clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111425301.5A CN114221255A (en) | 2021-11-26 | 2021-11-26 | +/-800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus-bar wire-lifting clamp |
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| Publication Number | Publication Date |
|---|---|
| CN114221255A true CN114221255A (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111425301.5A Pending CN114221255A (en) | 2021-11-26 | 2021-11-26 | +/-800 kV extra-high voltage direct current line live working squirrel-cage type tubular bus-bar wire-lifting clamp |
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| CN (1) | CN114221255A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014183688A (en) * | 2013-03-21 | 2014-09-29 | Chugoku Electric Power Co Inc:The | Load cancellation device for insulator |
| CN204103346U (en) * | 2014-08-13 | 2015-01-14 | 国家电网公司 | ± 800kV UHVDC Transmission Lines live line working strain insulator hard tube mother carries line apparatus |
| CN104505766A (en) * | 2014-12-02 | 2015-04-08 | 国家电网公司 | Tool and method for live replacement of 500kV strain insulator strings in substations |
| CN206860600U (en) * | 2017-06-30 | 2018-01-09 | 北京费森尤斯卡比医药有限公司 | A kind of clip |
| CN208337014U (en) * | 2017-11-27 | 2019-01-04 | 甘肃送变电工程有限公司 | A kind of charged for replacement Voltage for Insulators on HV Lines lifting block hanging point heightening device |
| CN110350443A (en) * | 2019-07-19 | 2019-10-18 | 国家电网有限公司 | A kind of interim drainage tool of livewire work |
| CN111641157A (en) * | 2020-06-10 | 2020-09-08 | 江苏省送变电有限公司 | Insulator closed fixture |
| CN112249950A (en) * | 2020-11-05 | 2021-01-22 | 国网湖南省电力有限公司 | Hanging bracket and method for live replacement of any insulator of extra-high voltage strain insulator string |
-
2021
- 2021-11-26 CN CN202111425301.5A patent/CN114221255A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014183688A (en) * | 2013-03-21 | 2014-09-29 | Chugoku Electric Power Co Inc:The | Load cancellation device for insulator |
| CN204103346U (en) * | 2014-08-13 | 2015-01-14 | 国家电网公司 | ± 800kV UHVDC Transmission Lines live line working strain insulator hard tube mother carries line apparatus |
| CN104505766A (en) * | 2014-12-02 | 2015-04-08 | 国家电网公司 | Tool and method for live replacement of 500kV strain insulator strings in substations |
| CN206860600U (en) * | 2017-06-30 | 2018-01-09 | 北京费森尤斯卡比医药有限公司 | A kind of clip |
| CN208337014U (en) * | 2017-11-27 | 2019-01-04 | 甘肃送变电工程有限公司 | A kind of charged for replacement Voltage for Insulators on HV Lines lifting block hanging point heightening device |
| CN110350443A (en) * | 2019-07-19 | 2019-10-18 | 国家电网有限公司 | A kind of interim drainage tool of livewire work |
| CN111641157A (en) * | 2020-06-10 | 2020-09-08 | 江苏省送变电有限公司 | Insulator closed fixture |
| CN112249950A (en) * | 2020-11-05 | 2021-01-22 | 国网湖南省电力有限公司 | Hanging bracket and method for live replacement of any insulator of extra-high voltage strain insulator string |
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