CN109119933A - A kind of online de-icing method of power distribution network and device - Google Patents
A kind of online de-icing method of power distribution network and device Download PDFInfo
- Publication number
- CN109119933A CN109119933A CN201811057550.1A CN201811057550A CN109119933A CN 109119933 A CN109119933 A CN 109119933A CN 201811057550 A CN201811057550 A CN 201811057550A CN 109119933 A CN109119933 A CN 109119933A
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- Prior art keywords
- distribution network
- line
- suppression coil
- power distribution
- online
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Classifications
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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
-
- 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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
Abstract
The present invention provides a kind of online de-icing method of power distribution network and devices, wherein, this method comprises: after the target line icing of determining distribution network line, by target line and lightning conducter short circuit, and put into arc suppression coil, so that lightning conducter, target line and arc suppression coil constitute circuit, and generate zero-sequence current and be superimposed in the primary current of target line, carries out ice-melt；Wherein, distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.The present invention utilizes lightning conducter, arc suppression coil and icing railway superstructures zero sequence circuit, is not had a power failure online ice-melt to icing route.
Description
Technical field
The present invention relates to power distribution network de-icing technology field more particularly to a kind of online de-icing methods of power distribution network and device.
Background technique
Transmission line icing is a kind of serious natural calamity, can cause line passing load, conductor galloping, insulator chain flashover etc.
Accident seriously endangers the safe operation of electric system.
The main ice-melting mode of power distribution network includes mechanical deicing and electrothermal ice melting, existing electrothermal ice melting mode at present
It is power failure ice-melt, i.e., after transmission line icing, needs open-circuit line, route is made to temporarily cease energization, then gives the external electricity of route
Source device, then powered on to route and realize hot ice-melt.
Therefore, the electrothermal ice melting of the prior art needs to have a power failure, and will cause certain economic loss, therefore provides one kind and do not stop
Electric online de-icing method becomes those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
The embodiment of the invention provides a kind of online de-icing method of power distribution network and device, it can be realized not have a power failure and melt online
Ice.
According to an aspect of the present invention, a kind of online de-icing method of power distribution network is provided, comprising:
After the target line icing for determining distribution network line, by target line and lightning conducter short circuit, and arc suppression coil is put into,
So that the lightning conducter, the target line and the arc suppression coil constitute circuit, and generates zero-sequence current and be superimposed on the mesh
In the primary current on graticule road, ice-melt is carried out；
Wherein, the distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
Preferably, it after the target line icing of the determining distribution network line, by target line and lightning conducter short circuit, and throws
Enter arc suppression coil specifically:
It is short in the target location and lightning conducter after the target position icing for determining the target line of distribution network line
Road, and the impedance value according to the target position relative to the distance adjusting arc suppression coil of power distribution network source side.
Preferably, the target line is any one-phase circuit in the distribution network line.
Preferably, the impedance value of the arc suppression coil is the inductance value of the arc suppression coil.
According to another aspect of the present invention, a kind of online deicing device of power distribution network is provided, comprising:
Short-circuit ice-melt module, it is after the target line icing for determining distribution network line, target line is short with lightning conducter
Road, and arc suppression coil is put into, so that the lightning conducter, the target line and the arc suppression coil constitute circuit, and generate zero
Sequence electric current is superimposed in the primary current of the target line, carries out ice-melt；
Wherein, the distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
Preferably, the short-circuit ice-melt module is also used to determine the target position icing of the target line of distribution network line
Afterwards, lightning conducter short circuit, and the distance tune according to the target position relative to power distribution network source side are in the target position
The impedance value of arc suppression coil is saved, so that the lightning conducter, the target line and the arc suppression coil constitute circuit, and generates zero
Sequence electric current is superimposed in the primary current of the target line, carries out ice-melt.
Preferably, the target line is any one-phase circuit in the distribution network line.
Preferably, the impedance value of the arc suppression coil is the inductance value of the arc suppression coil.
According to another aspect of the present invention, a kind of online deicing device of power distribution network is provided, comprising: memory, and coupling
To the processor of the memory；
The processor is configured to execution is matched as described above based on the instruction being stored in the memory devices
Powernet de-icing method.
According to another aspect of the present invention, a kind of computer-readable medium is provided, computer program is stored thereon with, the journey
Above-described power distribution network online de-icing method is realized when sequence is executed by processor.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The present invention provides a kind of online de-icing method of power distribution network and devices, wherein this method comprises: determining distribution cable
After the target line icing on road, by target line and lightning conducter short circuit, and arc suppression coil is put into, so that lightning conducter, target line
Circuit is constituted with arc suppression coil, and generates zero-sequence current and is superimposed in the primary current of target line, carries out ice-melt；Wherein, distribution
Cable road is three-phase circuit, and its neutral point passes through grounding through arc.The present invention utilizes lightning conducter, arc suppression coil and icing line
Road constitutes zero sequence circuit, is not had a power failure online ice-melt to icing route.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of one embodiment of the online de-icing method of power distribution network provided by the invention；
Fig. 2 is a kind of application scenarios schematic diagram of one embodiment of the online de-icing method of power distribution network provided by the invention.
Specific embodiment
The embodiment of the invention provides a kind of online de-icing method of power distribution network and device, it can be realized not have a power failure and melt online
Ice.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of one embodiment of the online de-icing method of power distribution network provided by the invention, comprising:
101, after the target line icing for determining distribution network line, by target line and lightning conducter short circuit, and extinguishing arc is put into
Coil so that lightning conducter, target line and arc suppression coil constitute circuit, and generates the original electricity that zero-sequence current is superimposed on target line
On stream, ice-melt is carried out；
Wherein, distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
The present invention utilizes lightning conducter, arc suppression coil and icing railway superstructures zero sequence circuit, is not had a power failure to icing route
Online ice-melt.
Further, step 101 specifically:
After the target position icing for determining the target line of distribution network line, in target location and lightning conducter short circuit, and
The impedance value for adjusting arc suppression coil relative to the distance of power distribution network source side according to target position, so that lightning conducter, target line
Circuit is constituted with arc suppression coil, and generates zero-sequence current and is superimposed in the primary current of target line, carries out ice-melt.
In this embodiment, the target position of icing in target line is usually first determined, then by target position and lightning-arrest
Line connection, that is, realize short circuit.Since the position of icing on route is not usually fixation, the zero sequence that different location is constituted
Impedance loop is different, as shown in Fig. 2, therefore this implementation can distance according to target position relative to power distribution network source side,
The impedance value of arc suppression coil is adjusted with ice melting current needed for matching target position.
Further, target line is any one-phase circuit in distribution network line.
In ice-melt, the single-phase connection lightning conducter of target line is subjected to single-phase short circuit, starting arc suppression coil compensates zero
Sequence circuit, the line current of phase where single-phase earthing increase to ice melting current, other two-phase electricity from load current (original electric current)
Stream is basically unchanged, and when ice-melt does not lose load, and realization does not have a power failure online ice-melt.As shown in Fig. 2, when route needs ice-melt, it will
The distribution line phase (by taking A phase as an example) of icing and lightning conducter carry out short circuit, put into arc suppression coil, at this time icing route, lightning-arrest
Line and arc suppression coil constitute circuit and carry out ice-melt.When ice-melt, the superimposed zero-sequence current of A, electric current increases to ice melting current, B, C phase
Electric current remains unchanged.Similarly, when B phase (C phase) and lightning conducter are shorted, it can be achieved that B phase (C phase) do not have a power failure ice-melt.
Further, the impedance value of arc suppression coil is the inductance value of arc suppression coil.
The present invention has following advantages:
1, the achievable 10kV distribution line of the present invention does not have a power failure online ice-melt；
2, it present invention can be suitably applied to different size distribution line ice-melt, realize that route is different by adjusting arc suppression coil impedance
Apart from ice-melt, it is provided simultaneously with two functions of route extinguishing arc and ice-melt；
3, the present invention carries out ice-melt using existing equipment and route, it is easy to accomplish, increase equipment, improvement cost without additional
It is low；
4, the present invention constitutes ice-melt circuit using lightning conducter, and lightning conducter has the function of lightning protection and two kinds of ice-melt simultaneously.
It is the detailed description carried out to a kind of online de-icing method of power distribution network provided by the invention above, it below will be to this hair
A kind of structure of the online deicing device of power distribution network of bright offer is illustrated, a kind of online ice-melt dress of power distribution network provided by the invention
The one embodiment set, comprising:
Short-circuit ice-melt module, it is after the target line icing for determining distribution network line, target line is short with lightning conducter
Road, and arc suppression coil is put into, so that lightning conducter, target line and arc suppression coil constitute circuit, and generates zero-sequence current and be superimposed on
In the primary current of target line, ice-melt is carried out；
Wherein, distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
Optionally, short-circuit ice-melt module, after being also used to the target position icing of the target line of determining distribution network line,
Target position is in lightning conducter short circuit, and adjusts the resistance of arc suppression coil relative to the distance of power distribution network source side according to target position
Anti- value so that lightning conducter, target line and arc suppression coil constitute circuit, and generates the original electricity that zero-sequence current is superimposed on target line
On stream, ice-melt is carried out.
Optionally, target line is any one-phase circuit in distribution network line.
Optionally, the impedance value of arc suppression coil is the inductance value of arc suppression coil.
Another embodiment of the online deicing device of a kind of power distribution network provided by the invention, comprising: memory, and coupling
To the processor of memory；
Processor is configured as that it is online to execute power distribution network as described above based on the instruction being stored in memory devices
De-icing method.
The invention further relates to a kind of computer-readable mediums, are stored thereon with computer program, which is held by processor
Above-described power distribution network online de-icing method is realized when row.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of online de-icing method of power distribution network characterized by comprising
After the target line icing for determining distribution network line, by target line and lightning conducter short circuit, and arc suppression coil is put into, so that
The lightning conducter, the target line and the arc suppression coil constitute circuit, and generate zero-sequence current and be superimposed on the score
In the primary current on road, ice-melt is carried out；
Wherein, the distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
2. the online de-icing method of power distribution network according to claim 1, which is characterized in that the mesh of the determining distribution network line
After marking transmission line icing, by target line and lightning conducter short circuit, and arc suppression coil is put into specifically:
After the target position icing for determining the target line of distribution network line, in the target location and lightning conducter short circuit, and
The impedance value of arc suppression coil is adjusted relative to the distance of power distribution network source side according to the target position.
3. the online de-icing method of power distribution network according to claim 2, which is characterized in that the target line is the distribution
Any one-phase circuit in cable road.
4. the online de-icing method of power distribution network according to claim 2, which is characterized in that the impedance value of the arc suppression coil is
The inductance value of the arc suppression coil.
5. a kind of online deicing device of power distribution network characterized by comprising
Short-circuit ice-melt module, after the target line icing for determining distribution network line, by target line and lightning conducter short circuit, and
Arc suppression coil is put into, so that the lightning conducter, the target line and the arc suppression coil constitute circuit, and generates zero-sequence current
It is superimposed in the primary current of the target line, carries out ice-melt；
Wherein, the distribution network line is three-phase circuit, and its neutral point passes through grounding through arc.
6. the online deicing device of power distribution network according to claim 5, which is characterized in that the short circuit ice-melt module is also used to
After the target position icing for determining the target line of distribution network line, the target position be in lightning conducter short circuit, and according to
The target position adjusts the impedance value of arc suppression coil relative to the distance of power distribution network source side, so that the lightning conducter, described
Target line and the arc suppression coil constitute circuit, and generate zero-sequence current and be superimposed in the primary current of the target line, into
Row ice-melt.
7. the online deicing device of power distribution network according to claim 6, which is characterized in that the target line is the distribution
Any one-phase circuit in cable road.
8. the online deicing device of power distribution network according to claim 6, which is characterized in that the impedance value of the arc suppression coil is
The inductance value of the arc suppression coil.
9. a kind of online deicing device of power distribution network characterized by comprising memory, and it is coupled to the place of the memory
Manage device；
The processor is configured to being executed based on the instruction being stored in the memory devices as Claims 1-4 is any
The online de-icing method of power distribution network described in one.
10. a kind of computer-readable medium, is stored thereon with computer program, which is characterized in that the program is executed by processor
The online de-icing method of power distribution network described in Shi Shixian Claims 1-4 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811057550.1A CN109119933A (en) | 2018-09-11 | 2018-09-11 | A kind of online de-icing method of power distribution network and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811057550.1A CN109119933A (en) | 2018-09-11 | 2018-09-11 | A kind of online de-icing method of power distribution network and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431125A (en) * | 2020-05-11 | 2020-07-17 | 广东电网有限责任公司清远供电局 | Online ice melting device |
| CN111431126A (en) * | 2020-05-11 | 2020-07-17 | 广东电网有限责任公司清远供电局 | Online ice melting device |
| CN111478262A (en) * | 2020-05-11 | 2020-07-31 | 广东电网有限责任公司清远供电局 | Online ice melting device based on linear transformer |
| CN111525485A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司 | Online ice-melt device of distribution network |
| CN111564808A (en) * | 2020-04-02 | 2020-08-21 | 国网浙江省电力有限公司湖州供电公司 | Ground wire direct current ice melting device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082962A (en) * | 1977-07-11 | 1978-04-04 | Burgsdorf Vladimir Vladimirovi | Device for melting the icing by direct current on conductors of overhead power transmission line |
| CN101621190A (en) * | 2009-06-17 | 2010-01-06 | 西安工程大学 | System for online monitoring icing and deicing processes of power transmission line |
| CN102611062A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for determining parameters of transmission line overhead ground wire direct-current ice-melting device |
| CN104953529A (en) * | 2015-03-05 | 2015-09-30 | 国家电网公司 | Single-phase-ground-fault-current-based on-line ice melting method of distribution line |
| CN106058777A (en) * | 2016-07-25 | 2016-10-26 | 国网湖南省电力公司 | Uhv transmission line ice-melting system and automatic ice-melting method thereof |
-
2018
- 2018-09-11 CN CN201811057550.1A patent/CN109119933A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082962A (en) * | 1977-07-11 | 1978-04-04 | Burgsdorf Vladimir Vladimirovi | Device for melting the icing by direct current on conductors of overhead power transmission line |
| CN101621190A (en) * | 2009-06-17 | 2010-01-06 | 西安工程大学 | System for online monitoring icing and deicing processes of power transmission line |
| CN102611062A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for determining parameters of transmission line overhead ground wire direct-current ice-melting device |
| CN104953529A (en) * | 2015-03-05 | 2015-09-30 | 国家电网公司 | Single-phase-ground-fault-current-based on-line ice melting method of distribution line |
| CN106058777A (en) * | 2016-07-25 | 2016-10-26 | 国网湖南省电力公司 | Uhv transmission line ice-melting system and automatic ice-melting method thereof |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564808A (en) * | 2020-04-02 | 2020-08-21 | 国网浙江省电力有限公司湖州供电公司 | Ground wire direct current ice melting device |
| CN111564808B (en) * | 2020-04-02 | 2021-11-09 | 国网浙江省电力有限公司湖州供电公司 | Ground wire direct current ice melting device |
| CN111525485A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司 | Online ice-melt device of distribution network |
| WO2021223342A1 (en) * | 2020-05-08 | 2021-11-11 | 广东电网有限责任公司清远供电局 | On-line ice-melting appartus for power distribution network |
| CN111431125A (en) * | 2020-05-11 | 2020-07-17 | 广东电网有限责任公司清远供电局 | Online ice melting device |
| CN111431126A (en) * | 2020-05-11 | 2020-07-17 | 广东电网有限责任公司清远供电局 | Online ice melting device |
| CN111478262A (en) * | 2020-05-11 | 2020-07-31 | 广东电网有限责任公司清远供电局 | Online ice melting device based on linear transformer |
| CN111431125B (en) * | 2020-05-11 | 2021-04-16 | 广东电网有限责任公司清远供电局 | Online ice melting device |
| WO2021227267A1 (en) * | 2020-05-11 | 2021-11-18 | 广东电网有限责任公司清远供电局 | On-line ice-melting apparatus |
| WO2021227268A1 (en) * | 2020-05-11 | 2021-11-18 | 广东电网有限责任公司清远供电局 | On-line ice-melting apparatus |
| WO2021227270A1 (en) * | 2020-05-11 | 2021-11-18 | 广东电网有限责任公司清远供电局 | On-line ice-melting apparatus based on linear transformer |
| US11742648B2 (en) | 2020-05-11 | 2023-08-29 | Qingyuan Power Supply Bureau Of Guangdong Power Grid Corporation | Online ice melting apparatus |
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