CN111697482B - 10KV overhead line non-outage moving and modifying method - Google Patents
10KV overhead line non-outage moving and modifying method Download PDFInfo
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- CN111697482B CN111697482B CN202010376737.9A CN202010376737A CN111697482B CN 111697482 B CN111697482 B CN 111697482B CN 202010376737 A CN202010376737 A CN 202010376737A CN 111697482 B CN111697482 B CN 111697482B
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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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Abstract
The invention discloses a 10KV overhead line non-outage moving and modifying method, which belongs to the technical field of 10KV overhead line maintenance and comprises the following steps: s1, removing the original line power supply branch straight overlap lead, and connecting a second disconnecting link and a second switch at the position of the original line power supply branch straight overlap lead; s2, short-circuiting the first disconnecting link and the first switch by using an insulating drainage wire, pulling the first disconnecting link and the first switch open, removing a first disconnecting link pile head lead wire, and overlapping the first disconnecting link pile head lead wire to an outgoing cable; s3, closing the outlet switch, checking phases on two sides of the first knife switch group, closing the mother switch of the original line power supply and the mother switch of the changed line power supply after the phase sequence is checked to be correct, and closing the first knife switch and the first switch; s4, pulling the second disconnecting link and the second switch open, then pulling the female switch open, and finally removing the insulated drainage wire and the second disconnecting link lead wire by adopting a live working method; and S5, removing the original power supply overhead line of the line by adopting a live working method, and completing the line transfer.
Description
Technical Field
The invention relates to the technical field of 10KV overhead line maintenance, in particular to a method for changing a 10KV overhead line without power outage.
Background
In the power grid construction process, when the rear section of a branch line of a 10KV overhead line is connected to another power supply point for power supply due to reasons of line load distribution, relocation and transformation, municipal construction and the like, in a conventional relocation and transformation operation site, as shown in fig. 1, the line to be relocated and transformed is powered off and then powered on, a high-voltage operation and maintenance personnel pulls open a branch line disconnecting switch 001, a live-line operator removes a branch line power supply 002 access point in an electrified way, the branch line relocation and transformation is completed in a power failure state, finally the lead wire lap joint work of the migrated and transformed line and a new power supply 003 is completed by the live-line operator, the number of users in the power failure is an important index for calculating the reliability of power supply, the number of users in the power failure in one power failure time is the product of the number of users related to the power failure and the number of power failure hours, and the conventional relocation and transformation operation mode is combined with the power failure through the live-line operation and the maintenance, the power of other line user terminals 004 except the line to be changed is ensured not to be cut off, the number of the users in power failure is reduced, but the users on the line to be changed still need to be cut off, and the normal life of the users is seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and design a convenient and practical 10KV overhead line non-outage moving and modifying method.
In order to solve the technical problems, the invention adopts the following technical scheme:
a10 KV overhead line non-outage moving and modifying method comprises the following steps:
s1, carrying out on-load switch installation operation by adopting an on-line operation method, wherein the relocation and modification circuit comprises an original circuit power supply branch straight overlap lead which is overlapped with an original circuit power supply, the original circuit power supply branch straight overlap lead is removed, and a second disconnecting link switch group is connected to the position of the original circuit power supply branch straight overlap lead, and comprises a second disconnecting link and a second switch;
s2, short-circuiting a first knife switch group consisting of a first knife switch and a first switch on the migration and modification line by using an insulated drainage wire through a live working method, pulling the first knife switch and the first switch open, removing a first knife switch pile head lead through the live working method, and overlapping the first knife switch pile head lead to an outgoing cable of the power supply of the migration and modification line;
s3, closing the outlet switch, checking phases on two sides of the first knife switch group, closing the bus switch of the original line power supply and the moved and modified line power supply after the phase sequence is checked to be correct, and closing the first knife switch and the first switch, wherein at the moment, the original line power supply and the moved and modified line power supply simultaneously supply power to users on the moved and modified line;
s4, pulling the second disconnecting link and the second switch open, then pulling the master switch and the slave switch of the original line power supply and the changed line power supply, and finally removing the insulated drainage wire and the second disconnecting link lead wire by adopting a live working method, wherein the changed line power supply supplies power independently;
and S5, removing the original power supply overhead line of the line by adopting a live working method, and completing the line transfer.
The beneficial effect of this scheme of adoption:
when the moving and modifying method in the scheme is used for moving and modifying the 10KV overhead line, based on the existing or newly-built net rack, the live working means is fully utilized to be combined with switching operation and power supply switching, and the loop closing and ring opening of the line to be modified and the power supply switching target are completed in the operation mode of 'first lap joint, second reconnection and then old dismantling', so that the overhead line is modified without power outage, the normal production and life of users on the moving and modifying line cannot be influenced, the economic loss is greatly reduced, the maintenance efficiency of the 10KV overhead line is improved, and the practicability is high.
Preferably, in step S2, the first knife switch is close to the original line power supply, the first switch is close to the user end, the second switch is connected between the original line power supply and the first knife switch, the second knife switch is connected between the original line power supply and the second switch, one end of the insulating drainage wire is connected between the knife switch and the second switch, and the other end of the insulating drainage wire is connected between the first switch and the user.
Preferably, the first switch is an isolating switch, and the second switch is an isolating switch.
Preferably, the line power supply after the replacement is arranged in the ring main unit, the outgoing cable extends out of the ring main unit, and the outgoing switch is arranged in the ring main unit.
These features and advantages of the invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a conventional relocation operation field line.
FIG. 2 is a schematic diagram of the field line before the relocation of the present invention.
FIG. 3 is a schematic diagram of the field line after the migration step S1 is completed.
Fig. 4 is a schematic diagram of the field line after the migration step S2 is completed.
FIG. 5 is a schematic diagram of the field line after the migration step S3 is completed.
FIG. 6 is a schematic diagram of the field line after the migration step S4 is completed.
FIG. 7 is a schematic diagram of the field line after the migration step S5 is completed.
Reference numerals: the original line power supply 001 a; a branch direct lap lead 1 of an original line power supply; a second knife switch group 2; a second knife switch 201; a second switch 202; a first knife switch group 3; a first blade brake 301; an insulated drainage wire 4; a first switch 302; the ring main unit 002 a; an outgoing cable 002 aa; the user terminal 003 a.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example (b):
as shown in fig. 3 to 7, a method for migrating and modifying a 10KV overhead line without power outage comprises the following steps:
s1, carrying out the operation of installing the switch with load by adopting an live-line operation method, wherein the relocation and change circuit comprises an original circuit power supply branch straight overlap lead 1 lapped with an original circuit power supply 001a, the original circuit power supply branch straight overlap lead 1 is removed, a second disconnecting link switch group 2 is connected to the position of the original circuit power supply branch straight overlap lead 1, the second disconnecting link switch group 2 comprises a second disconnecting link 201 and a second switch 202, the step is to install the switch at the original power supply access point and create the device condition, and after the operation is completed, the circuit schematic diagram is shown in figure 3;
s2, using an insulated drainage wire 4 to short-circuit a first knife switch group 3 consisting of a first knife switch 301 and a first switch 302 on the migration and modification line by adopting a live working method, pulling the first knife switch 301 and the first switch 302 open, removing a pile head lead of the first knife switch 301 by adopting the live working method, and lapping the pile head lead of the first knife switch 301 to an outgoing cable 002aa of the line power supply after the migration and modification, wherein the step is to remove the original switch of the migration and modification line and prepare for accessing the line power supply after the migration and modification, after the step is completed, the schematic diagram of the line is shown in figure 4, the line power supply after the migration and modification is arranged in a ring main unit 002a, the outgoing cable 002aa extends out of the ring main unit 002a, and the outgoing switch is arranged in the ring main unit 002 a;
s3, closing the outlet switch, checking the phases of two sides of the first knife switch group 3, after the phase sequence is checked to be correct, closing the original line power supply 001a and the master switch of the changed line power supply, and closing the first knife switch 301 and the first switch 302, wherein at the moment, the original line power supply 001a and the changed line power supply simultaneously supply power to the user end 003a of the changed line, after the operation is completed, the line schematic diagram is shown in figure 5, in the step, the changed line power supply and the original line power supply 001a are required to run in parallel, and two lines have loop closing conditions, so that the phases of two sides of the first knife switch 301 switch are required to be correct before the two line power supplies run in parallel;
s4, pulling the second knife switch 201 and the second switch 202 open, then pulling the original line power supply 001a and the master-slave switch of the changed line power supply open, finally adopting an electrified operation method to remove the insulated drainage wire 4 and the lead wire of the second knife switch 201, and then independently supplying power by the changed line power supply, wherein after the operation is completed, the schematic diagram of the line is shown in figure 6;
s5, removing the original line power supply 001a overhead line by adopting a live working method, completing line relocation and transformation, wherein the schematic diagram of the line after the relocation and transformation is shown in FIG. 7.
When the moving and modifying method in the scheme is used for moving and modifying the 10KV overhead line, based on the existing or newly-built net rack, the live working means is fully utilized to be combined with switching operation and power supply switching, and the loop closing and ring opening and power supply switching targets of the line to be modified are completed in the operation mode of' lap joint first, then switching, and then dismantling, so that the overhead line is modified without power outage, the normal production and life of users at the user end 003a on the moving and modifying line can not be influenced, the number of users in the power outage is reduced, the economic loss is greatly reduced, and the overhaul efficiency of the 10KV overhead line is improved. In step S1, the switch installation with load means that the power lines on both sides of the switch are completely kept without power outage while the switch is installed by using live working and by using bypass work or other non-power-outage maintenance means.
In step S2, the first switch 301 is close to the original line power supply 001a, the first switch 302 is close to the user side 003a, the second switch 202 is connected between the original line power supply 001a and the first switch 301, the second switch 201 is connected between the original line power supply 001a and the second switch 202, one end of the insulating drainage wire 4 is connected between the switch and the second switch 202, the other end of the insulating drainage wire 4 is connected between the first switch 302 and the user side 003a, and the two ends of the insulating drainage wire 4 are respectively connected to the two ends of the first switch group 3, so as to achieve the purpose of using the insulating drainage wire 4 to short-circuit the first switch group 3.
To ensure safety of the operator and the equipment, the first switch 302 and the second switch 202 are preferably isolation switches.
While the foregoing is directed to embodiments of the present invention, the scope of the invention should not be limited thereby, and it will be apparent to those skilled in the art that the invention includes, but is not limited to, those illustrated in the drawings and described in the foregoing detailed description. Any modification which does not depart from the functional and structural principles of the invention is intended to be included within the scope of the claims.
Claims (4)
1. A10 KV overhead line non-outage moving and modifying method is characterized by comprising the following steps:
s1, carrying out on-load switch installation operation by adopting an on-line operation method, wherein the relocation and modification circuit comprises an original circuit power supply branch straight overlap lead which is overlapped with an original circuit power supply, the original circuit power supply branch straight overlap lead is removed, and a second disconnecting link switch group is connected to the position of the original circuit power supply branch straight overlap lead, and comprises a second disconnecting link and a second switch;
s2, short-circuiting a first knife switch group consisting of a first knife switch and a first switch on the migration and modification line by using an insulated drainage wire through a live working method, pulling the first knife switch and the first switch open, removing a first knife switch pile head lead through the live working method, and overlapping the first knife switch pile head lead to an outgoing cable of the power supply of the migration and modification line;
s3, closing the outlet switch, checking phases on two sides of the first knife switch group, closing the bus switch of the original line power supply and the moved and modified line power supply after the phase sequence is checked to be correct, and closing the first knife switch and the first switch, wherein at the moment, the original line power supply and the moved and modified line power supply simultaneously supply power to users on the moved and modified line;
s4, pulling the second disconnecting link and the second switch open, then pulling the master switch and the slave switch of the original line power supply and the changed line power supply, and finally removing the insulated drainage wire and the second disconnecting link lead wire by adopting a live working method, wherein the changed line power supply supplies power independently;
and S5, removing the original power supply overhead line of the line by adopting a live working method, and completing the line transfer.
2. The method for non-stop power transition of the 10KV overhead line according to claim 1, wherein in step S2, the first knife switch is close to the original line power supply, the first switch is close to the user end, the second switch is connected between the original line power supply and the first knife switch, the second knife switch is connected between the original line power supply and the second switch, one end of the insulating drainage wire is connected between the knife switch and the second switch, and the other end of the insulating drainage wire is connected between the first switch and the user.
3. The 10KV overhead line non-outage relocation method according to claim 1 or 2, wherein the first switch is an isolating switch, and the second switch is an isolating switch.
4. The 10KV overhead line non-outage relocation method according to claim 1, wherein the relocated line power supply is arranged in a ring main unit, the outgoing cables extend out of the ring main unit, and the outgoing switches are arranged in the ring main unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010376737.9A CN111697482B (en) | 2020-05-07 | 2020-05-07 | 10KV overhead line non-outage moving and modifying method |
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| CN202010376737.9A CN111697482B (en) | 2020-05-07 | 2020-05-07 | 10KV overhead line non-outage moving and modifying method |
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| CN111697482B true CN111697482B (en) | 2021-11-23 |
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| CN112242666B (en) * | 2020-09-29 | 2022-04-19 | 浙江大有实业有限公司带电作业分公司 | Method for replacing outgoing cable of line with radial structure |
| CN112510572B (en) * | 2020-09-29 | 2022-09-09 | 浙江大有实业有限公司带电作业分公司 | Radial structure overhead line moving and modifying method based on uninterrupted power demand |
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| KR20100086090A (en) * | 2009-01-20 | 2010-07-30 | 대원전기 주식회사 | Method for moving utility poll including overhead line without power interruption |
| CN208352981U (en) * | 2018-07-24 | 2019-01-08 | 广东电网有限责任公司 | Direct current system load, which moves, changes tool |
| CN110120643B (en) * | 2019-04-19 | 2020-10-27 | 国网浙江淳安县供电有限公司 | Uninterrupted power operation method for power line of ground potential distribution network |
| CN111009871B (en) * | 2019-12-03 | 2021-09-17 | 广东顺德电力设计院有限公司 | Method and system for changing cable by crossing subway |
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