CN112510572B - Radial structure overhead line moving and modifying method based on uninterrupted power demand - Google Patents
Radial structure overhead line moving and modifying method based on uninterrupted power demand Download PDFInfo
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- CN112510572B CN112510572B CN202011048823.3A CN202011048823A CN112510572B CN 112510572 B CN112510572 B CN 112510572B CN 202011048823 A CN202011048823 A CN 202011048823A CN 112510572 B CN112510572 B CN 112510572B
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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
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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
- 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
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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
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The embodiment of the application provides a radial structure overhead line relocation and transformation method based on a non-power-outage requirement, which comprises the steps of carrying out on a determined tower in an electrified operation mode and carrying out on tension opening operation with load; performing phase checking at the lower pile head of the overhead line and the newly-installed section switch; the single-phase arc suppression switch or the bypass load switch is used for disconnecting the tension lead at any end in the tension-resistant rod in a live working mode, the tension lead of the tension-resistant rod is disconnected in the live working mode, and the overhead line part is subjected to line unloading and hardware fitting dismantling; and returning to the tower with the disconnected tension lead, and unloading the overhead line part connected with the cable to be changed to finish the operation of disconnecting and pulling the overhead line. The overhead line is shunted by adopting a mode of connecting a newly-installed section switch and a newly-laid cable in advance, an overhead line needing to be connected with the cable is replaced, an overhead line part needing to be connected with the cable is dismantled by adopting a live working mode, the whole process is completely and uninterruptedly powered, and the loss of the number of households in power failure is reduced.
Description
Technical Field
The application belongs to the field of methods for overhauling a power distribution network, and particularly relates to a radial structure overhead line moving and modifying method based on a non-power-outage requirement.
Background
With the continuous development of national economy, urbanization of cities is continuously promoted, a power distribution network is matched with the construction needs of municipal engineering, line moving and changing work is frequently carried out, for example, due to the needs of road widening or crossing, an overhead line on an original road or a crossed block needs to be changed into cable laying in a whole section, so that the urban environment is beautified, the operation and maintenance level of the line is improved, the moving and changing work of the overhead line changing the cable line is called overhead line 'changing-up' project, and in the operation process, users on the overhead line have the possibility of accompanying power failure. In the looped netowrk structure circuit that has the offside power, as shown in fig. 1, can be through the overhead line of offside power to the user power supply that sends back, but to the overhead line of radiation structure, because do not send back to the offside power, when carrying on above-mentioned overhead line "change from top to bottom" engineering, often can cause the user to lose electricity on the overhead line, number of users loss when causing a large amount of power failure for the power supply enterprise, influence power supply enterprise's power supply reliability and electric power operator environment, bring very big economic loss for the enterprise, influence regional within range user's normal production operation activity.
As shown in fig. 1: when the overhead line changes the cable area and takes place on the overhead line, because there is the existence of offside power II, can be through the hot switching operation of switch, with the operation mode of overhead line, change the power transmission output of original power I into carrying out the power transmission output by offside power II, and in the overhead line changes the maintenance mode of the segmentation switch of additional installation of cable area, change the overhead line into the cable area and keep apart to guarantee "change from top to bottom" during the project, user 1 on the overhead line, user 2, user 3, user 4, user 5's normal power consumption is not influenced.
However, for a radial structure line without the opposite side power supply II, as shown in fig. 2, when the cable change area of the overhead line occurs on the overhead line, because there is no scheme for implementing load transfer to the opposite side power supply, performing the "change from up" project in power outage may cause the user 1, the user 2, the user 3, the user 4, and the user 5 to stop, and power transmission may not be resumed until the "change from up" project is completed, so that a great loss of the number of users in power outage may be generated for the overhead line, which seriously affects power supply reliability and power operator environment, and user power utilization satisfaction.
Although partial overhead line cable changing work is carried out in the overhead line with the radiation structure, a mode of using a temporary mobile power supply to be accessed in an overhauled area at the rear section of the overhead line can be adopted to realize continuous power supply for users, the temporary mobile power supply is often accessed to a necessary operation field on site to be supplied to parking of a temporary mobile power supply generator car and cable access, and meanwhile, the capacity of the mobile power supply generator car can not meet the limitation of user load on the overhead line, so that a plurality of schemes for continuously supplying power to the users by the temporary mobile power supply access can not be developed due to the limitation. Therefore, a completely uninterrupted power supply mode is needed, that is, a power-uninterrupted mode is needed to complete the moving and modifying work of changing the cable from the overhead line of the radial structure line.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the application provides a method for moving and changing the overhead line with the radial structure based on the uninterrupted power demand.
Specifically, the moving and modifying method for the overhead line with the radial structure based on the uninterrupted power demand comprises the following steps:
step 1, determining towers at two ends of an overhead line needing to be changed into cable connection, and performing live working mode live-line and loaded strain opening operation on the determined towers;
step 2, newly installing a section switch for connecting a cable on the pole tower which is changed into the tension-resisting pole, and newly installing the section switch off position;
step 3, connecting a newly laid cable in a live working mode, connecting one end of the newly laid cable to a lower pile head of a newly installed section switch, and lapping one end of the newly laid cable to an overhead line on the outer side of the determined tower;
step 4, performing phase checking at the lower pile head of the overhead line and the newly-installed section switch;
step 5, checking the phase consistency of the two sides of the newly-installed section switch, closing the section switch, confirming that the existing load current in the newly-laid cable flows by adopting a current measuring means, and disconnecting the two ends of the overhead line which needs to be changed into the cable connection by adopting a single-phase arc-extinguishing switch or a bypass load switch and adopting a live working mode to change the two ends of the overhead line into tension lead wires at any end in the tension rod;
step 6, adopting a live working mode to remove the tension lead with the other end changed into the tension-resistant rod, and carrying out wire unloading and hardware fitting removal on the overhead line part needing to be connected with the cable;
and 7, returning to the pole tower with the disconnected tension lead in the step 5, unloading the overhead line part connected with the cable to be changed, and finally completing the operation of disconnecting and pulling the pole of the overhead line comprising the part to be changed.
Optionally, the performing of the live-line operation on the determined tower in the live-line operation mode with live-line load includes:
in the construction of power lines, a lead is cut off at a certain linear rod in a tension resistant section, and the linear rod is changed into the tension resistant rod.
Optionally, the connecting the new cabling includes:
one end of the newly laid cable is connected with the lower pile head of the newly installed section switch, and the other end of the newly laid cable is connected to the overhead line outside the tower at the other end on the overhead line to be changed in a hot-line work mode;
when the newly laid cable is connected with the overhead line, the section switches can be newly installed at two ends of the cable for connection;
and splicing a pile head lead of the newly-installed section switch to the overhead line.
Optionally, the phase checking is performed at the pile head under the overhead line and the new section switch, and includes:
if the phases are consistent, the operation of step 5 is directly performed,
and if the phases are inconsistent, adjusting the phase of the lap joint position on the overhead line lapped on the tower at the other end in a live working mode until the phase is correct, and then performing the operation of the step 5.
The beneficial effect that technical scheme that this application provided brought is:
adopt this kind of method to change the overhead line part that needs to be moved and change into cable run and current power failure to examine and implement to repair and change into cable run and compare, the technical scheme that this application proposed has beneficial effect does:
1. according to the method for moving and changing the overhead line with the radial structure based on the uninterrupted power supply requirement, the users on the overhead line cannot be subjected to power failure sensing in the whole process, and the loss of the number of the users is zero during power failure.
2. The section switch can be installed at both ends of the overhead line to be reconnected or can be installed at one selected end, and the means is flexible.
3. The radial structure overhead line moving and modifying method based on the uninterrupted power demand is suitable for sections of the radial structure overhead line, such as the front section, the middle section, the rear section and the like, is suitable for various overhead line rod head device forms of a single loop or multiple loops and the like, and is wide in application scene and strong in applicability.
4. The method for migrating and changing the overhead line with the radial structure based on the uninterrupted power demand can also utilize a newly-installed section switch to be connected with a newly-laid and re-routed overhead line in advance to shunt the original overhead line and replace the overhead line needing to be connected with a cable. The cost is lower, and the method can be suitable for more application scenes.
5. The method for moving and modifying the overhead line with the radial structure based on the uninterrupted power demand can be implemented step by step and section by day, can also be implemented continuously on the same day when the overhead line is removed, has great flexibility, can be implemented step by step and section by day in advance, can avoid the days which are not suitable for carrying out live working, such as thunderstorm and the like, can be carried out on the same day when the overhead line is removed, is only limited to the wire detaching and wire detaching work of two base tension-resistant rods, and can effectively control the rigid implementation of a working plan.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an isolation of an overhead line to a cable area by a sectionalizing switch hot swap operation according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a radial structure circuit without an opposite side power supply II according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for migrating and modifying an overhead line with a radial structure based on a non-power-outage requirement according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram illustrating a method for migrating and modifying an overhead line with a radial structure based on a non-power-outage requirement according to an embodiment of the present application to ensure that a user continuously supplies power to the overhead line;
FIG. 5 is a schematic circuit diagram of a live-loaded new section switch according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram illustrating the disconnection of a 10# rod strain lead by a single-phase arc-extinguishing switch or a bypass load switch in a live working manner according to an embodiment of the present application;
fig. 7 is a schematic line diagram of a manner in which overhead lines are connected by cables instead according to an embodiment of the present application.
Detailed Description
To make the structure and advantages of the present application clearer, the structure of the present application will be further described with reference to the accompanying drawings.
Example one
Specifically, as shown in fig. 3, the method for migrating and modifying an overhead line with a radial structure based on a non-power-outage requirement includes:
step 1, determining towers at two ends of an overhead line needing to be changed into cable connection, and performing live working mode live-line and loaded strain opening operation on the determined towers;
step 2, newly installing a section switch for connecting a cable on the pole tower which is changed into the tension-resisting pole, and newly installing the section switch in an off position;
step 3, connecting a newly laid cable in a live working mode, connecting one end of the newly laid cable to a lower pile head of a newly installed section switch, and lapping one end of the newly laid cable to an overhead line on the outer side of the determined tower;
step 4, performing phase checking at the lower pile head of the overhead line and the newly-installed section switch;
step 5, checking the phase consistency of the two sides of the newly-installed section switch, closing the section switch, confirming that the existing load current in the newly-laid cable flows by adopting a current measuring means, and disconnecting the two ends of the overhead line which needs to be changed into the cable connection by adopting a single-phase arc-extinguishing switch or a bypass load switch and adopting a live working mode to change the two ends of the overhead line into tension lead wires at any end in the tension rod;
step 6, adopting a live working mode to remove the tension lead with the other end changed into the tension-resistant rod, and carrying out wire unloading and hardware fitting removal on the overhead line part needing to be connected with the cable;
and 7, returning to the tower with the broken tension lead in the step 5, unloading the overhead line part connected with the cable to be changed, and finally completing the operation of disconnecting and pulling the overhead line comprising the part to be changed.
In the implementation, this application adopts the mode that newly adorns section switch and new cabling connects in advance, shunt overhead line, and replace the overhead line that needs to change cable junction, take live working mode to demolish the overhead line part that needs to change the cable at last, such uninterrupted power mode, whole complete uninterrupted power supply, compare normal power failure and carry out partial overhead line and connect and change cable line and connect "change from top to bottom" and need several hours at least, very big reduction the loss of house number when having a power failure, power supply reliability and electric power operator environment have effectively been improved.
Optionally, the strain opening operation of the determined tower in the live-line operation mode with live load in step 1 includes:
the conducting wires on the straight pole towers at the first end and the last end of the part to be moved and modified are changed into tension-resistant connection in a charged load mode, and the straight poles are changed into tension-resistant poles.
As shown in fig. 4: due to the requirements of municipal road construction and the like, the line between 10# pole and 20# pole on the overhead line is required to be changed from an overhead line connection mode to a cable connection mode, and at the moment, the continuous power supply of the user 1, the user 2, the user 3, the user 4 and the user 5 on the overhead line is ensured by adopting a radial structure overhead line changing method based on the non-power-outage requirement.
In the structure shown in fig. 4, the 10# pole and the 20# pole are firstly charged in a live working mode to be changed into tension rods, and preparation is made for finally dismantling the overhead line between the 10# pole and the 20# pole.
Optionally, the connecting of the new cabling proposed in step 3 includes:
one end of the newly laid cable is connected with a lower pile head of the newly installed section switch, and the other end of the newly laid cable is connected to the overhead line outside the tower at the other end on the overhead line to be reconnected in a live working mode;
and (4) splicing a pile head lead on the newly-installed section switch to an overhead line on the outer side of the 10# pole or the 20# pole tower.
As shown in fig. 5: the section switch is installed on the No. 20 pole in a charged mode, and the section switch is in an off position. And newly laying a cable from the 10# pole to the 20# pole, connecting one end of the newly laid cable with the lower pile head of the newly-installed section switch, and connecting one end of the newly laid cable with the small-size side of the 10# pole in a live working mode. And then, overlapping the pile head lead of the newly-installed section switch to the large-size side of the 20# tower, namely the overhead line on the outer side in a live-line operation mode.
The newly laid cable can be laid in advance, the cable terminal is fixed on the tower after being manufactured, the position of the tower does not affect the safe operation of the overhead line, and the lapping operation is carried out on the same day of construction.
As shown in fig. 5: checking the phase of a section switch newly installed on the No. 20 pole and an overhead line, wherein the phase is inconsistent, and correcting the phase of a newly laid cable on the small-size side of the No. 10 pole in a live working mode until the phase is correct. And after the phases are consistent, closing the newly-installed section switch. The 1-6 work items can be completed in advance within days before the overhead line is dismantled, and can also be completed continuously within the day of the overhead line is dismantled.
Optionally, the phase checking at the lower pile head of the overhead line and the newly-installed section switch in step 4 includes:
if the phases are consistent, the operation of step 5 is directly performed,
and if the phases are inconsistent, adjusting the phase of the lap joint position on the overhead line lapped on the tower at the other end in a live working mode until the phase is correct, and then performing the operation of the step 5.
As shown in figure 6, an ammeter is used for measuring whether the through-current of a newly-installed section switch is normal or not, after normal shunt is determined, a 10# rod strain lead is disconnected by using a single-phase arc suppression switch or a bypass load switch in a hot-line work mode, a pull wire is installed and fixed along the direction of a circuit on the large-size side of a 10# rod, and the rod is prevented from falling during subsequent wire unloading.
After the 10# rod strain lead is detached and the stay wire is installed, the stay wire is installed and fixed in a live working mode in the direction opposite to the line direction on the small-size side of the 20# rod, the rod is prevented from being reversed, the 20# rod strain lead is detached again, and the stay wire is detached towards the small-size side. After the 20# rod strain lead is disconnected and the wire is removed to the small-size side, the wire is removed to the large-size side from the 10# rod in a live working mode.
As shown in figure 7, the overhead lines between 10# poles and 20# poles on the overhead lines are connected by cables, so that the requirements of ground municipal road construction and the like are met.
In the embodiment, the tension-resisting rods are changed by changing live loads of towers at two ends of a transformation area in advance, cables needing to be connected are laid, the overhead line needing to be changed in cable connection is replaced by connecting and shunting the overhead line in a mode of newly installing the section switch, and finally the overhead line is disconnected in a live mode.
The mode of utilizing the newly-installed section switch and the newly-installed cable to connect in advance to shunt the overhead line and replace the overhead line needing to be changed in cable connection is also suitable for utilizing the newly-installed section switch and the newly-installed overhead line changing the route to connect in advance to shunt the original overhead line and replace the overhead line needing to be changed in cable connection, or utilizing the overhead cable mixed type line formed by combining the newly-installed section switch, the newly-installed cable and the newly-installed overhead line changing the route to shunt the original overhead line and replace the overhead line needing to be changed in cable connection, namely the newly-installed cable in the graph can be replaced by the newly-installed overhead line or the overhead and cable mixed line.
Above-mentioned process is owing to utilize the new dress section switch and the new mode that lays cable and connect in advance, shunt overhead line, and replace the overhead line that needs to change cable junction, take live working mode to demolish the overhead line part that needs to change cable junction at last, such uninterrupted power mode, whole complete uninterrupted power supply, compare normal power failure and carry out partial overhead line and connect and change cable junction "change from top to bottom" and need several hours at least, very big reduction the loss of number of households when having a power failure, power supply reliability has effectively been improved and the electric power operator environment has been optimized.
It is anticipated that the above-mentioned method of connecting the newly installed section switch and the newly laid cable in advance to shunt the overhead line and replace the overhead line to be changed in cable connection is also applicable to the method of connecting the newly installed section switch and the newly laid and re-routed overhead line in advance to shunt the original overhead line and replace the overhead line to be changed in cable connection, or the overhead cable hybrid line formed by combining the newly installed section switch, the newly laid cable and the newly laid and re-routed overhead line to shunt the original overhead line and replace the overhead line to be changed in cable connection, and this method is also within the protection scope of the present application.
Claims (3)
1. A moving and changing method of an overhead line with a radial structure based on a non-power-outage requirement is characterized by comprising the following steps:
step 1, determining towers at two ends of an overhead line needing to be changed into cable connection, and performing live working mode live-line and loaded strain opening operation on the determined towers;
step 2, newly installing a section switch for connecting a cable on the pole tower which is changed into the tension-resisting pole, and newly installing the section switch off position;
step 3, connecting a newly laid cable in a live working mode, connecting one end of the newly laid cable to a lower pile head of a newly installed section switch, and lapping one end of the newly laid cable to an overhead line on the outer side of the determined tower;
step 4, performing phase checking at the lower pile head of the overhead line and the newly-installed section switch;
step 5, checking the phase of two sides of a newly-installed section switch to be consistent, closing the section switch, confirming that the existing load current in the newly-laid cable flows by adopting a current measuring means, and disconnecting the two ends of the overhead line which needs to be changed into the cable connection and is changed into the tension lead of any end in the tension rod by adopting a single-phase arc-extinguishing switch or a bypass load switch in a live working mode;
step 6, adopting a hot-line work mode to remove the tension lead with the other end changed into the tension rod, and unloading the overhead line part needing to be connected with the cable and removing hardware fittings;
step 7, returning to the tower with the broken tension lead in the step 5, unloading the overhead line part connected with the cable to be changed, and finally completing the operation of disconnecting and pulling the overhead line comprising the part to be changed;
the phase checking is carried out at the lower pile head of the overhead line and the newly-installed section switch, and the phase checking method comprises the following steps:
if the phases are consistent, the operation of step 5 is directly performed,
and if the phases are inconsistent, adjusting the phase of the lap joint position on the overhead line lapped on the tower at the other end in a live working mode until the phase is correct, and then performing the operation of the step 5.
2. The non-outage demand-based radial structure overhead line relocation method according to claim 1, wherein the conducting live-line live-load strain-opening operation on the determined towers comprises:
in the construction of power lines, a lead is cut off at a certain linear rod in the tension resistant section, and the linear rod is changed into the tension resistant rod.
3. The non-outage demand-based radial structure overhead line relocation method according to claim 1, wherein the connecting new cabling comprises:
one end of the newly laid cable is connected with a lower pile head of the newly installed section switch, and the other end of the newly laid cable is connected to the overhead line outside the tower at the other end on the overhead line to be reconnected in a live working mode;
when the newly laid cable is connected with the overhead line, the section switches can be newly installed at two ends of the cable for connection;
and splicing a pile head lead of the newly-installed section switch to the overhead line.
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| CN107482535A (en) * | 2017-10-17 | 2017-12-15 | 吉林师范大学 | On-load cut-offs the method that 10KV line linears bar installs block switch additional |
| CN108736466A (en) * | 2018-04-03 | 2018-11-02 | 国网浙江省电力有限公司杭州供电公司 | A kind of method of distribution temporary subsection |
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| RU1820433C (en) * | 1991-03-11 | 1993-06-07 | Ровенское Опытное Предприятие Производства Работ Под Напряжением | Method for emergency repair of broken transmission line alive |
| CN101888073A (en) * | 2009-05-15 | 2010-11-17 | 上海市南电力工程有限公司 | On-load opened and segmented operating method of 10kV line |
| CN103618245B (en) * | 2013-11-08 | 2017-04-12 | 国家电网公司 | Electrified strain opening operation method on distribution network |
| CN203734209U (en) * | 2014-02-17 | 2014-07-23 | 广东电网公司佛山供电局 | Live working device for cable bypass |
| CN108155601A (en) * | 2018-01-08 | 2018-06-12 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of method that on-load straight line pole changes tension-resistant rod |
| CN111697482B (en) * | 2020-05-07 | 2021-11-23 | 国网浙江省电力有限公司金华供电公司 | 10KV overhead line non-outage moving and modifying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482535A (en) * | 2017-10-17 | 2017-12-15 | 吉林师范大学 | On-load cut-offs the method that 10KV line linears bar installs block switch additional |
| CN108736466A (en) * | 2018-04-03 | 2018-11-02 | 国网浙江省电力有限公司杭州供电公司 | A kind of method of distribution temporary subsection |
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