CN113889900A - Construction method for live migration strain tower and wire of distribution network - Google Patents
Construction method for live migration strain tower and wire of distribution network Download PDFInfo
- Publication number
- CN113889900A CN113889900A CN202111005360.7A CN202111005360A CN113889900A CN 113889900 A CN113889900 A CN 113889900A CN 202111005360 A CN202111005360 A CN 202111005360A CN 113889900 A CN113889900 A CN 113889900A
- Authority
- CN
- China
- Prior art keywords
- tower
- wire
- distribution network
- strain
- new
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005012 migration Effects 0.000 title claims abstract description 21
- 238000013508 migration Methods 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012546 transfer Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000004020 conductor Substances 0.000 claims description 11
- 239000012212 insulator Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 239000012211 strain insulator Substances 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000001617 migratory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
Abstract
The invention discloses a construction method for live migration strain towers and wires of a distribution network, which is characterized by being used for the migration of the strain towers and the wires of overhead lines of the distribution network of 20kV or below, and comprising the following steps: s1, establishing a bypass loop and a new tension rod; s2, load transfer and lead transfer; s3, removing the old line; the power distribution network has great effect in uninterrupted operation, effectively avoids the trouble of power failure of residents and enterprises, and greatly improves the reliability of power supply of the distribution network; the stress condition of the electric pole can be detected in the process of drawing the lead, and the pole falling accident caused by unbalanced stress is avoided; and the tension-resistant rod and the wire are transferred under the live state of the overhead line, so that the power supply reliability is improved.
Description
Technical Field
The invention relates to the technical field of live working of overhead lines of medium-voltage distribution networks, in particular to a construction method of live migration strain towers and wires of distribution networks.
Background
The 'live-line withdrawing and straight pole erecting' operation project in the four major types of 33 operation projects of the national grid plays a great role in uninterrupted operation, and effectively avoids the trouble of power failure of residents and enterprises. In present net overhead line that joins in marriage, live migration straight line shaft tower construction project is comparatively ripe, however, with the coexistence of straight line shaft tower have a large amount of strain towers in addition, strain towers as can bear leading, ground wire level and the special shaft tower of perpendicular load in overhead line, have the important function in joining in marriage net twine way, nevertheless just because its special structure, bring great degree of difficulty for not stopping the migration. Meanwhile, due to the large difficulty, a suitable method is found to break through the limitation, the tension rod is transferred without power outage, and the method has important significance for improving the power supply reliability of the distribution network.
The tension rod is moved without power failure operation, and the tension rod is moved by a plurality of technologies such as bypass operation, lead extension, device conversion, dynamic stress balance and the like, and the complexity of the operation process is large. At present, no live migration tension rod and wire operation project exists in China distribution network uninterrupted operation project construction catalogues, and a novel distribution network uninterrupted operation project is tried to be developed for national grid Carxing power supply company for reducing power failure: loaded migratory tensile bars (wires), 4 months 2020, were practiced by Jiaxing power supply company.
For example, a "power distribution network overhead conductor replacement method" disclosed in chinese patent literature has a publication number: CN112242665A, change original air wire and change the starting point and the terminal point alternately, change to whole air wire according to the order, with the whole power failure operation in the district, influence the normal work life of user.
Disclosure of Invention
Therefore, the invention provides a construction method for live migration strain tower and wire of a distribution network, which can transfer the strain tower and the wire in an overhead line live state and improve the power supply reliability.
In order to achieve the above purpose, the invention provides the following technical scheme:
a construction method for live migration of strain towers and wires of distribution networks is used for migration of strain towers and wires of overhead lines of distribution networks of 20kV or below, and comprises the following steps:
s1, establishing a bypass loop and a new tension rod;
s2, load transfer and lead transfer;
and S3, removing the old line.
Preferably, the newly erected tension rod in S1 includes:
erecting a new line;
carrying out stress analysis on towers on two sides of the strain tower to be migrated, and establishing a stress dynamic balance system; when the shifting angle causes unbalanced stress of the electric poles on the two sides in the direction perpendicular to the line, pull wires are additionally arranged, so that the stress balance of the electric poles on the two sides in the direction perpendicular to the line after the line is shifted is ensured;
insulating and shielding the tower and the wires: and carrying out insulation wrapping treatment on the strain tower to be migrated and the wire.
Preferably, when the bypass loop is established in S1, the connection points on the two sides of the bypass are selected at the towers on the two sides of the tension tower to be migrated, so as to reduce the downward pressure of the bypass cable on the conductor during the migration of the conductor.
Preferably, the transfer sequence in S2 is:
the load is transferred to the bypass loop, the wires are transferred, and the load is transferred to the new line.
Preferably, the wire transfer comprises:
the tail end of the lead is controlled to be more than 0.4m away from the electric pole cross arm by means of cutting short tail lines in sections, and the tail end of the lead is controlled to swing;
2 groups of traction ropes are matched to achieve dynamic stress balance, one group is arranged on an old pole, the other group is arranged on a new vertical pole tower, and the traction ropes of each group comprise main stress ropes and backup protection ropes; pulleys are respectively arranged at the bottom of the tower and at the cross arm of the tower in the new base tower and the old base tower, two groups of traction ropes pass through the pulley block to be connected with the wire clamping device, and the traction ropes and the backup ropes are all insulated ropes and always keep the effective insulation length of more than 0.4 m.
Preferably, the wire transfer further comprises:
tightening the conductor in the bucket at the old rod and the ground, and removing the conductor from the strain clamp in the bucket;
loosening the traction rope at the old rod, synchronously tightening the traction rope at the new rod, and transferring the lead to the new rod;
and adjusting the length of the lead, and fixedly connecting the lead to the strain clamp corresponding to the new rod.
Preferably, the wire transfer further comprises:
the connection of the wire is prolonged, when the length of the wire is shortened after the wire is transferred to a new rod, the method is adopted, namely, a hardware fitting is added on the new rod, the length of the strain insulator string is increased, the added hardware fitting is a lengthening ring, and the mode of increasing the strain insulator string comprises the steps of increasing the number of porcelain insulator pieces and synthesizing the insulator string by using a high-voltage grade.
The embodiment of the invention has the following advantages:
(1) the power distribution network has great effect in uninterrupted operation, effectively avoids the trouble of power failure of residents and enterprises, and greatly improves the reliability of power supply of the distribution network; (2) the stress condition of the electric pole can be detected in the process of drawing the lead, and the pole falling accident caused by unbalanced stress is avoided; (3) and the tension-resistant rod and the wire are transferred under the live state of the overhead line, so that the power supply reliability is improved.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the invention, and do not limit the limit conditions of the invention, so that the invention has no technical essence, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the technical contents disclosed in the invention without affecting the efficacy and the achievable purpose of the invention.
FIG. 1 is a schematic illustration of a horizontal lateral migration scheme of the present invention.
FIG. 2 is a schematic diagram of the bypass circuit of the present invention.
Fig. 3 is a schematic diagram of the arrangement of the dynamic stress balancing system of the present invention.
Detailed Description
While embodiments of the present invention will be described with reference to particular embodiments, those skilled in the art will readily appreciate that the present invention has additional advantages and benefits that may be realized from the teachings herein, and that the embodiments described are only a few, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, in one embodiment, the present invention is described by an example of horizontal lateral translation, and the technical solution of the present invention is as follows: the temporary bypass loop is constructed for the jumper wire on the old tension rod through bypass operation, then the jumping lead wire on the tension rod is disassembled, the physical separation of the main lead wires on the two sides of the tension rod is realized, the tension rod is erected newly, then the leads (one side can be transferred according to specific conditions) on the two sides of the tension rod are transferred to the erected tension rod one by one, after the leads are transferred, the leads on the two sides of the new tension rod are lapped, the bypass loop is removed again, and finally the old tension rod is pulled out.
Wherein, the project is implemented in three stages:
the first stage is as follows:
newly erecting a tension-resisting rod, and installing a negative isolating switch (electrified);
erecting a new line, wherein the new line is an empty line (non-electrified);
the adjusting device changes the fixing mode of the old rod wire from top binding to side binding and sets a high-tension one way (electrification);
and a second stage:
laying a bypass, and arranging a bypass (electrified) from the small-size side of the old rod to be replaced to the large-size side of the non-replaced old rod;
the load is transferred to the bypass, the bypass switch is closed, and the isolating switch is opened;
wire transfer: transferring the three-phase wires to a new tower item by item, and overlapping the strain lead wires of the new tower;
load transfer to new line: after the nuclear phase is correct, closing the isolating switch of the new rod, and then removing the bypass;
and a third stage: breaking the original branch lead; removing the old lead; and (5) withdrawing the rod.
Wherein, the setting of atress dynamic balance system is:
2 groups of hauling ropes are matched to achieve dynamic stress balance. One assembled on the old rod and the other assembled on the new rod. Each group of traction ropes consists of 1 main stress rope and 1 backup protection rope. The purpose of setting up like this is that every looks wire keeps stress balance all the time through two main atress ropes at the in-process that shifts to slowly shift to new pole from old pole under the state that keeps balance, the wire side of every atress rope is fixed with the wire with the fixing-line device, and the pole head respectively establishes a set of diverting pulley with the root, and the ground side is connected with the chain block to pull the chain block and adjust the elasticity. Meanwhile, in order to ensure that accidents caused by wire running do not occur, 2 backup protection ropes are arranged in the process of transferring each phase of lead at the same time to ensure the stress balance of the main stress rope under the condition of unexpected faults under the condition of mutually balanced micro-stress. The wire side of each backup protection rope is fixed with the wire through a wire clamping device, the head and the root of the electric pole are respectively provided with a group of steering pulleys, and the ground side is controlled by a ground electrician.
The lead transfer method comprises the following steps:
the inside of the hopper at the old rod is matched with the ground to tighten the wire, and the wire is separated from the strain clamp in the hopper;
slowly loosening the traction rope at the old rod, synchronously slowly tightening the traction rope at the new rod, and gradually transferring the lead to the new rod;
and adjusting the length of the lead, and fixedly connecting the lead to the strain clamp corresponding to the new rod.
In the process of transferring the conducting wire:
the method ensures that a charged body and a ground potential member keep a sufficient safe distance in the wire transfer process, and a strict and reliable insulation shielding measure is arranged before the transfer operation. The shielding range is as follows:
firstly, a new strain rod head and an original strain rod head are connected from a top phase insulator to the lower part of a cross arm;
secondly, the other two phases of the three-phase main conductor are always shielded in the process of one-phase transfer;
the traction rope and the backup rope are both insulated ropes, and the effective insulation length is always kept to be more than 0.4 m;
and in the lead transferring process, a mode of cutting short tails in sections is adopted, and the distance between the tail end of the lead and the electric pole cross arm is controlled to be larger than 0.4 m. And controlling the tail end of the lead to swing;
temporary stay wires are arranged on the old pole and the new pole so as to detect the stress condition of the electric pole in the process of drawing the lead.
Meanwhile, the original line conductor is basically adopted as the conductor in the project, the phenomenon that one side is long and the other side is short occurs after the conductor is transferred to a new rod, the adopted method mainly comprises the steps of adding hardware fittings on the new rod and increasing the length of the tension string, the added hardware fittings are extension rings, and the tension string is increased in the mode of increasing the number of porcelain insulator sheets and synthesizing the insulator string by using a high voltage level.
In another embodiment, the other steps are the same as the first embodiment, the layout of the tension section is changed, the operation mode of newly arranging the integral bypass of the tension section is matched, or a plurality of special tools for disconnecting the unloaded line and transferring the load current are utilized, the use of bypass cables is reduced, and the field applicability is improved.
In the third embodiment, the other steps are as in the first embodiment, and the present invention is used for moving along the line direction, translating to the outside corner side of the line, translating to the inside corner side of the line, and migrating the scene.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. A construction method for live migration of strain towers and wires of distribution networks is characterized in that the method is used for migration of strain towers and wires of overhead lines of distribution networks of 20kV and below, and comprises the following steps:
s1, establishing a bypass loop and a new tension rod;
s2, load transfer and lead transfer;
and S3, removing the old line.
2. The construction method of the live migration tension tower and the conducting wire for the distribution network of claim 1, wherein the newly erected tension tower in the S1 comprises:
erecting a new line;
carrying out stress analysis on towers on two sides of the strain tower to be migrated, and establishing a stress dynamic balance system; when the shifting angle causes unbalanced stress of the electric poles on the two sides in the direction perpendicular to the line, pull wires are additionally arranged for ensuring balanced stress of the electric poles on the two sides in the direction perpendicular to the line after the line is shifted;
insulating and shielding the tower and the wires: and carrying out insulation wrapping treatment on the strain tower to be migrated and the wire.
3. The construction method of the distribution network live migration tension tower and the conducting wire as claimed in claim 1 or 2, wherein when the bypass loop is established in the step S1, connection points on two sides of the bypass are selected from the positions of the towers on two sides of the tension tower to be migrated, and are used for reducing downward pressure of the bypass cable on the conducting wire in the process of migrating the conducting wire.
4. The construction method of the live migration strain tower and the conducting wire for the distribution network according to claim 1, wherein the transfer sequence in the S2 is as follows:
the load is transferred to the bypass loop, the wires are transferred, and the load is transferred to the new line.
5. The construction method of the live migration tension tower and the conducting wire for the distribution network according to claim 4, wherein the conducting wire transferring comprises the following steps:
the tail end of the lead is controlled to be more than 0.4m away from the electric pole cross arm by means of cutting short tail lines in sections, and the tail end of the lead is controlled to swing;
2 groups of traction ropes are matched to achieve dynamic stress balance, one group is arranged on an old pole, the other group is arranged on a new vertical pole tower, and the traction ropes of each group comprise main stress ropes and backup protection ropes; pulleys are respectively arranged at the bottom of the tower and at the cross arm of the tower in the new base tower and the old base tower, two groups of traction ropes pass through the pulley block to be connected with the wire clamping device, and the traction ropes and the backup ropes are all insulated ropes, and the effective insulation length of more than 0.4m is required to be kept all the time.
6. The construction method of the live migration tension tower and the conducting wire for the distribution network according to claim 4 or 5, wherein the conducting wire transferring further comprises:
tightening the conductor in the bucket at the old rod and the ground, and removing the conductor from the strain clamp in the bucket;
loosening the traction rope at the old rod, synchronously tightening the traction rope at the new rod, and transferring the lead to the new rod;
and adjusting the length of the lead, and fixedly connecting the lead to the strain clamp corresponding to the new rod.
7. The construction method of the live migration tension tower and the wire for the distribution network according to claim 6, wherein the wire transferring further comprises:
the connection of the wire is prolonged, when the length of the wire is shortened after the wire is transferred to a new rod, the method is adopted, namely, a hardware fitting is added on the new rod, the length of the strain insulator string is increased, the added hardware fitting is a lengthening ring, and the mode of increasing the strain insulator string comprises the steps of increasing the number of porcelain insulator pieces and synthesizing the insulator string by using a high-voltage grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005360.7A CN113889900A (en) | 2021-08-30 | 2021-08-30 | Construction method for live migration strain tower and wire of distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005360.7A CN113889900A (en) | 2021-08-30 | 2021-08-30 | Construction method for live migration strain tower and wire of distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113889900A true CN113889900A (en) | 2022-01-04 |
Family
ID=79011676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111005360.7A Pending CN113889900A (en) | 2021-08-30 | 2021-08-30 | Construction method for live migration strain tower and wire of distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113889900A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888070A (en) * | 2009-05-15 | 2010-11-17 | 上海市南电力工程有限公司 | 10KV bypass cable operation method |
| CN102290738A (en) * | 2011-05-13 | 2011-12-21 | 四川省电力公司绵阳电业局 | Construction method for replacing 35kV line tension pole cross arm |
| CN103683098A (en) * | 2013-12-02 | 2014-03-26 | 国家电网公司 | Method of replacing strain poles without laying down lines |
| CN108963875A (en) * | 2018-07-19 | 2018-12-07 | 吉林师范大学 | The method of on-load migration 10KV overhead transmission line |
| CN113224686A (en) * | 2021-05-17 | 2021-08-06 | 国网福建省电力有限公司厦门供电公司 | Method for live replacement of distribution network overhead line linear tension pole |
-
2021
- 2021-08-30 CN CN202111005360.7A patent/CN113889900A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888070A (en) * | 2009-05-15 | 2010-11-17 | 上海市南电力工程有限公司 | 10KV bypass cable operation method |
| CN102290738A (en) * | 2011-05-13 | 2011-12-21 | 四川省电力公司绵阳电业局 | Construction method for replacing 35kV line tension pole cross arm |
| CN103683098A (en) * | 2013-12-02 | 2014-03-26 | 国家电网公司 | Method of replacing strain poles without laying down lines |
| CN108963875A (en) * | 2018-07-19 | 2018-12-07 | 吉林师范大学 | The method of on-load migration 10KV overhead transmission line |
| CN113224686A (en) * | 2021-05-17 | 2021-08-06 | 国网福建省电力有限公司厦门供电公司 | Method for live replacement of distribution network overhead line linear tension pole |
Non-Patent Citations (2)
| Title |
|---|
| 吕宝生;张伟军;: ""二牵一"张力更换碳纤维导线关键施工技术研究", 江苏电机工程, no. 01, pages 52 - 55 * |
| 杨富刚;: "10kV带电旁路电缆作业系统在架空线路的应用及风险控制", 广西电业, no. 10, pages 95 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101888073A (en) | On-load opened and segmented operating method of 10kV line | |
| RU2422963C2 (en) | Device to melt silver thaw on wires and cables of overhead line (versions) | |
| CN104505766B (en) | The instrument and method of a kind of charged for replacement transformer station 500kV strain insulator strings | |
| US8471416B2 (en) | In situ reconstruction of high voltage electric power lines | |
| CN113889900A (en) | Construction method for live migration strain tower and wire of distribution network | |
| CN102684134A (en) | Lightning protection system of extra-high voltage alternating current double-circuit straight-line tower | |
| Khalilnezhad et al. | Shunt compensation design of EHV double-circuit mixed OHL-cable connections | |
| CN210779513U (en) | Power distribution device of transformer substation | |
| CN112636251B (en) | Method for changing 10kV straight pole into sectional pole in live mode | |
| CN201502207U (en) | High-voltage pole for aerial lines | |
| Burstein et al. | Design of a flexible AC/DC-link | |
| CN108028517A (en) | Live wire is set up, maintenance and repair method | |
| CN105576550B (en) | A kind of charged for replacement UHV transmission line single chip tension insulator method | |
| JP5788033B2 (en) | Overhead power transmission line support structure | |
| CN208479132U (en) | A kind of transposition special facilities suitable for existing double back anchor support | |
| JP5486120B1 (en) | Overhead power transmission line construction method and overhead power line support structure suitable for this method | |
| CN202564903U (en) | Lightning protection system of extra-high voltage alternating current double-loop tangent tower | |
| CN110380340A (en) | A kind of transformer substation power distribution unit | |
| CN114614399B (en) | Operating method for on-load migration tension rod | |
| CN112039085A (en) | Rail transit power supply system | |
| WO2018110845A1 (en) | Construction method for uninterruptible power distribution without bypass cable intermediate connection points using individually openable single-phase multi-branch switchgear for construction | |
| CN212033437U (en) | Transformer substation framework and outgoing line interval arrangement structure | |
| CN216981486U (en) | 35kV double-circuit cable climbing rod and terminal rod integrated device | |
| CN201312079Y (en) | Clamping apparatus for live line replacement of suspended insulator in middle of 500KV untypical tangent tower via splicing method | |
| CN201490579U (en) | 1,000kV power distribution unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |