CN102780193A - Current ice-melting method for overhead ground wires of electric transmission line - Google Patents
Current ice-melting method for overhead ground wires of electric transmission line Download PDFInfo
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- CN102780193A CN102780193A CN2012102325352A CN201210232535A CN102780193A CN 102780193 A CN102780193 A CN 102780193A CN 2012102325352 A CN2012102325352 A CN 2012102325352A CN 201210232535 A CN201210232535 A CN 201210232535A CN 102780193 A CN102780193 A CN 102780193A
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Abstract
The invention discloses a current ice-melting method for overhead ground wires of an electric transmission line. The method mainly includes following steps that by means of ground wire insulators, each of the overhead ground wires is down led in an insulation mode and grounded through grounding knife switches; the overhead ground wires are reliably grounded through the closed grounding knife switches when the electric transmission line is in normal operation; the grounding knife switches break, and the overhead ground wires are to ground insulation during ice melting; and a tail end of an overhead ground wire requiring ice melting is in short circuit with another nearby overhead ground wire or a shutdown transmission line, a starting end of the overhead ground wire requiring ice melting and the another nearby overhead ground wire or the shutdown transmission line are connected with an ice melting power supply to form an ice melting loop to start the ice melting power supply, and ice-melting currents are generated in the ice melting loop and used for working and heating to achieve ice melting. According to the current ice-melting method for the overhead ground wires of the electric transmission line, the ice-melting currents are loaded to the overhead ground wires to heat the overhead ground wires to rise temperatures so that covered ice on the overhead ground wires can be effectively melted.
Description
Technical field
The present invention relates to a kind of transmission line overhead ground wire electric current de-icing method, applicable to having single overhead ground wire also applicable to the transmission line ice-melt of two overhead ground wires.
Background technology
The electric current of the current ratio transmission pressure of transmission line overhead ground wire is much little, so easier icing.It is big that overhead ground wire sag behind the icing becomes; Can not satisfy the sag requirement of transmission line to its overhead ground wire; When wind is waved, between the transmission pressure of transmission line and overhead ground wire, be easy to take place the flashover phenomenon, make the transmission line tripping operation; Influence the normal operation of transmission line, and possibly damage transmission line.Also have, if iron tower two ends span does not wait or iron tower is in the mountain area, the overhead ground wire icing makes iron tower receive force unbalance, is prone to produce the danger that tower head is bent, is out of shape even fractures, and also possibly occur the iron tower inclination when serious or collapses.
Overhead ground wire mainly is divided into common overhead ground wire such as steel strand wire or good conductor ground wire and Optical Fiber Composite and is called for short OPGW built on stiltsly; Common overhead ground wire mainly adopts the earthing mode by basic ground connection and graded insulation single-point grounding; OPGW adopts the earthing mode by basic ground connection generally speaking owing to have the dual-use function of ground wire and communications optical cable concurrently.For overhead ground wire, be difficult to realize the direct electric current ice-melt of overhead ground wire by basic ground connection.Sometimes for the overhead ground wire ice-melt, even need take to remove the former overhead ground wire way of frame new line in addition.The use mechanical deicing method that also has, passive deicing method etc., but the deicing effect is not good.
Summary of the invention
Technical problem to be solved by this invention is, proposes a kind of new transmission line overhead ground wire de-icing method, utilizes de-icing method of the present invention; Can effectively carry out ice-melt to overhead ground wire, the appearance of problem such as the transmission line flashover of having avoided causing, iron tower distortion owing to the overhead ground wire icing, and during ice-melt; Need not to remove overhead ground wire; Method is implemented convenient, and is applied widely, for solving overhead ground wire ice-melt problem effective way is provided.
Technical problem to be solved by this invention realizes through following technical scheme:
A kind of transmission line overhead ground wire electric current de-icing method is characterized in that, comprises the steps:
S1) confirm the ice-melt length of the overhead ground wire of needs ice-melt according to overhead ground wire icing degree, confirm the ice-melt power source voltage, select to have the ground wire insulator of suitable mechanical intensity and confirm its protection clearance distance d;
S2) use said ground wire insulator respectively every overhead ground wire insulation to be drawn down; And through ground connection disconnecting link ground connection, when transmission line normally moved, said overhead ground wire was through closed ground connection disconnecting link reliable ground; The ground connection disconnecting link breaks off during ice-melt, the overhead ground wire insulation against ground;
S3) will need near another overhead ground wire end and its of overhead ground wire of ice-melt or the transmission pressure of having stopped transport through the shorting stub short circuit; And top and near described another overhead ground wire or the described transmission pressure of having stopped transport it that will need the overhead ground wire of ice-melt insert said ice-melt power supply and form the ice-melt loop; Open said ice-melt power supply; In said ice-melt loop, produce ice melting current, utilize electric current acting heating ice-melt.
For overhead ground wire is the circuit of graded insulation, when carrying out the overhead ground wire ice-melt, is communicated with the adjacent overhead ground wire section of each section on each the bar overhead ground wire in the determined ice-melt scope to form the ice-melt loop through jumper.Circuit for the insulation completely or the single-point grounding of insulating does not completely have waypoint because circuit is middle, then need not to use jumper.
Described step S1) specifically realize through following steps:
S1.1) the ground wire insulator that has suitable mechanical intensity according to its load, material requirements and mounting means selection;
S1.2) select the ice-melt supply voltage according to overhead ground wire icing degree and ice-melt length;
S1.3) confirm the protection clearance distance d of ground wire insulator according to said ice-melt supply voltage;
Whether the discharge voltage of S1.4) judging protection clearance distance d is less than the flashover voltage of ground wire insulator;
S1.5) if step S1.4) be false, then reduce ice-melt supply voltage and ice-melt length, return step S1.3); If step S1.4) sets up, confirm that ground wire insulator protection clearance distance is d.
Said shorting stub model is identical with above-mentioned overhead ground wire, and said overhead ground wire is identical with said another overhead ground wire model.
Said ice-melt power supply is the DC ice melting power supply or exchanges the ice-melt power supply.
The relative prior art of the present invention has following beneficial effect:
1. can effectively carry out the overhead ground wire ice-melt: adopt method of the present invention to load ice melting current and make the overhead ground wire self-heating to overhead ground wire; Temperature raises; Thereby effectively melt the icing on it, problem such as the transmission line flashover that can effectively avoid causing, iron tower distortion owing to the overhead ground wire icing, and during ice-melt; Need not to remove overhead ground wire, it is convenient to implement; The present invention has carried out ice-melt to area, Qingyuan City overhead ground wire, and the result shows that method of the present invention can effectively solve overhead ground wire icing problem, helps guaranteeing the normal operation in electric power system ice age;
2. applied widely: as to have considered only to have single overhead ground wire in the method for the present invention and had the situation of two overhead ground wires, be suitable for the overhead transmission line of different electric pressures; The present invention is insulated completely, is pursued situation such as basic ground connection, graded insulation single-point grounding applicable to overhead ground wire, and the scope of application is extensive;
3. cost is low: with respect to losses such as the circuit stoppage in transit that causes because of the overhead ground wire icing, transmission line scaling loss, iron tower damages, employed accessory cost is lower in the de-icing method of the present invention.
Description of drawings
Fig. 1 is step S1 of the present invention) FB(flow block);
Fig. 2 draws the structural representation that passes through ground connection disconnecting link ground connection down for overhead ground wire insulation of the present invention;
Fig. 3 is for being communicated with the structural representation of two adjacent overhead ground wire sections through jumper;
Fig. 4 is the structural representation of single overhead ground wire-lead ice-melt mode of connection;
Fig. 5 is the structural representation of two overhead ground wire ice-melt modes of connection.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
Fig. 1 is step S1 of the present invention) the idiographic flow block diagram; Step S1) need mainly need to confirm the overhead ground wire of ice-melt ice-melt length, confirm the ice-melt supply voltage, select to have the ground wire insulator of suitable mechanical intensity and confirm its protection clearance distance d that concrete steps are following:
S1.1) the ground wire insulator that has suitable mechanical intensity according to its load, material requirements and mounting means selection;
S1.2) select the ice-melt supply voltage according to overhead ground wire icing degree and ice-melt length;
S1.3) confirm the protection clearance distance d of ground wire insulator according to said ice-melt supply voltage;
Whether the discharge voltage of S1.4) judging protection clearance distance d less than the flashover voltage of ground wire insulator, notices that the discharge voltage of protection clearance distance d, the flashover voltage of ground wire insulator need consider that all it is done, wet situation;
S1.5) if step S1.4) set up, confirm that ground wire insulator protection clearance distance is d, if step S1.4) be false; Then reduce ice-melt supply voltage and ice-melt length; Because d is closely related with the ice-melt supply voltage for the protection clearance distance, has reduced the ice-melt supply voltage here, so should correspondingly reduce the protection clearance distance d of ground wire insulator; And rejudge, promptly return step S1.3).In the present embodiment, the ice-melt power supply is selected the DC ice melting power supply.
Fig. 2 is the structural representation under the insulation of operation overhead ground wire is drawn; Cross-arm place at strain tower supports overhead ground wire 2 through ground wire strain insulator formula insulator, and property-line insulator 1 is drawn 2 insulation of every overhead ground wire down respectively, and through ground connection disconnecting link 3 ground connection; When transmission line normally moves; Overhead ground wire 2 is through closed ground connection disconnecting link 3 reliable grounds, and ground connection disconnecting link 3 breaks off overhead ground wire 2 insulation against ground during ice-melt.
As shown in Figure 3, be the circuit of graded insulation for overhead ground wire 2, be about to whole piece overhead ground wire 2 and be divided into plurality of sections, insulation is broken off and difference ground connection between each section.If selected ice-melt length comprises the above-mentioned overhead ground wire section more than a section, can adopt the parallel groove clamp 7 overhead ground wire section that jumper 4 and each section is adjacent to be communicated with so that constitute the ice-melt loop.
Figure 4 and 5 are respectively the structural representation of single overhead ground wire-lead ice-melt mode of connection and the structural representation of two overhead ground wire ice-melt modes of connection.Wherein, single overhead ground wire-lead ice-melt mode of connection and two overhead ground wire ice-melt modes of connection are applicable to the transmission line that only has an overhead ground wire and the transmission line with two or above overhead ground wire respectively.
As shown in Figure 4; During 2 ice-melts of operation overhead ground wire, break off overhead ground wire 2 ground connection and draw the ground connection disconnecting link 3 on the lower end, two sections in the ice-melt scope adjacent overhead ground wire sections are communicated with through jumper 4; With overhead ground wire 2 ice-melt section right-hand members and near the transmission pressure of having stopped transport 5 it through shorting stub 6 short circuits; Left end and near the said DC ice melting power supply of the transmission pressure of having stopped transport 5 accesses it 8 formation ice-melt loops are opened DC ice melting power supply 8, in said ice-melt loop, produce ice melting current; Make overhead ground wire 2 self-heatings, reach the ice-melt purpose.
As shown in Figure 5; During ice-melt; The ground connection disconnecting link 3 that two overhead ground wires, 2,2 ˊ ground connection are drawn on the lower end all breaks off; Two sections adjacent overhead ground wire sections that two overhead ground wires, 2,2 ˊ in the ice-melt scope are gone up separately adopt parallel groove clamp to pass through jumper 4,4 ˊ respectively to be communicated with, and through the right-hand member short circuit of the shorting stub 6 identical with the overhead ground wire model with two overhead ground wires, 2,2 ˊ, and their left end is inserted said DC ice melting power supply 8 form the ice-melt loops.This kind mode of connection need not the transmission pressure of stopping transport.The also replaceable one-tenth of DC ice melting power supply 8 of the present invention exchanges the ice-melt power supply.
Claims (4)
1. a transmission line overhead ground wire electric current de-icing method is characterized in that, comprises the steps:
S1) confirm the ice-melt length of the overhead ground wire of needs ice-melt according to overhead ground wire icing degree, confirm the ice-melt power source voltage, select to have the ground wire insulator of suitable mechanical intensity and confirm its protection clearance distance d;
S2) use said ground wire insulator respectively every overhead ground wire insulation to be drawn down; And through ground connection disconnecting link ground connection, when transmission line normally moved, said overhead ground wire was through closed ground connection disconnecting link reliable ground; The ground connection disconnecting link breaks off during ice-melt, the overhead ground wire insulation against ground;
S3) will need near another overhead ground wire end and its of overhead ground wire of ice-melt or the transmission pressure of having stopped transport through the shorting stub short circuit; And top and near described another overhead ground wire or the described transmission pressure of having stopped transport it that will need the overhead ground wire of ice-melt insert said ice-melt power supply and form the ice-melt loop; Open said ice-melt power supply; In said ice-melt loop, produce ice melting current, utilize electric current acting heating ice-melt;
For overhead ground wire is the circuit of graded insulation, when carrying out the overhead ground wire ice-melt, is communicated with the adjacent overhead ground wire section of each section on each the bar overhead ground wire in the determined ice-melt scope to form the ice-melt loop through jumper.
2. transmission line overhead ground wire electric current de-icing method according to claim 1 is characterized in that said step S1) realize through following steps:
S1.1) the ground wire insulator that has suitable mechanical intensity according to its load, material requirements and mounting means selection;
S1.2) select the ice-melt supply voltage according to overhead ground wire icing degree and ice-melt length;
S1.3) confirm the protection clearance distance d of ground wire insulator according to said ice-melt supply voltage;
Whether the discharge voltage of S1.4) judging protection clearance distance d is less than the flashover voltage of ground wire insulator;
S1.5) if step S1.4) be false, then reduce ice-melt supply voltage and ice-melt length, return step S1.3); If step S1.4) sets up, confirm that ground wire insulator protection clearance distance is d.
3. transmission line overhead ground wire electric current de-icing method according to claim 1 and 2 is characterized in that said shorting stub model is identical with above-mentioned overhead ground wire.
4. transmission line overhead ground wire electric current de-icing method according to claim 1 is characterized in that, said ice-melt power supply is the DC ice melting power supply or exchanges the ice-melt power supply.
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| CN201210232535.2A CN102780193B (en) | 2012-07-06 | 2012-07-06 | A kind of power transmission line overhead ground wire electric current de-icing method |
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| CN201210232535.2A CN102780193B (en) | 2012-07-06 | 2012-07-06 | A kind of power transmission line overhead ground wire electric current de-icing method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247992A (en) * | 2013-05-07 | 2013-08-14 | 陈广生 | DC deicing method for overhead ground wires and OPGWs in electric transmission lines |
| CN103296629A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Ground wire DC (direct current) deicing method based on discharge gap insulator |
| CN103971974A (en) * | 2014-04-04 | 2014-08-06 | 国家电网公司 | Double-insulator ice-melting grounding disconnector |
| CN104332929A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Single-ground wire ice melting method |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104734100A (en) * | 2015-04-08 | 2015-06-24 | 国家电网公司 | Rectifier valve bank unit of extra-high voltage ground wire direct-current deicing device |
| CN105262001A (en) * | 2015-11-24 | 2016-01-20 | 国网四川省电力公司电力科学研究院 | Ice melting method for overhead ground wire of power transmission line |
| CN105281275A (en) * | 2014-06-16 | 2016-01-27 | 南京电力金具设计研究院有限公司 | Electric control device applied to automatic wiring device for ground wire deicing |
| CN105322493A (en) * | 2014-06-16 | 2016-02-10 | 中国南方电网有限责任公司超高压输电公司 | Ground wire ice melting automatic wiring device |
| CN105826889A (en) * | 2015-01-08 | 2016-08-03 | 罗日成 | Transmission line charged segmented DC ice melting method |
| CN105866642A (en) * | 2016-05-05 | 2016-08-17 | 中国电力科学研究院 | Method and system for performing pollution flashover testing on OPGW insulator chain |
| CN105911441A (en) * | 2016-05-05 | 2016-08-31 | 中国电力科学研究院 | Method and system for icing floashover test of OPGW insulator chain |
| CN106159798A (en) * | 2016-08-23 | 2016-11-23 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of transmission line of electricity connection in series-parallel mixing ground wire de-icing method |
| CN106169729A (en) * | 2016-08-23 | 2016-11-30 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of transmission line of electricity roundabout series connection ground wire de-icing method |
| CN107368650A (en) * | 2017-07-19 | 2017-11-21 | 武汉大学 | The method that quadrature analysis formulates tower linear system system ice-melt strategy |
| CN107658778A (en) * | 2017-10-08 | 2018-02-02 | 国网江西省电力公司电力科学研究院 | A kind of quick de-icing method of distribution network line |
| CN113708328A (en) * | 2021-08-24 | 2021-11-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Protection structure for photoelectric separator |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247992A (en) * | 2013-05-07 | 2013-08-14 | 陈广生 | DC deicing method for overhead ground wires and OPGWs in electric transmission lines |
| CN103247992B (en) * | 2013-05-07 | 2016-04-20 | 陈广生 | The direct current ice melting method of the common overhead ground wire of transmission line and OPGW |
| CN103296629A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Ground wire DC (direct current) deicing method based on discharge gap insulator |
| CN103971974A (en) * | 2014-04-04 | 2014-08-06 | 国家电网公司 | Double-insulator ice-melting grounding disconnector |
| CN105281275B (en) * | 2014-06-16 | 2017-07-21 | 南京电力金具设计研究院有限公司 | A kind of electrical control gear for ground wire deicing automatic connection device |
| CN105322493B (en) * | 2014-06-16 | 2017-07-07 | 中国南方电网有限责任公司超高压输电公司 | A kind of ground wire deicing automatic connection device |
| CN105281275A (en) * | 2014-06-16 | 2016-01-27 | 南京电力金具设计研究院有限公司 | Electric control device applied to automatic wiring device for ground wire deicing |
| CN105322493A (en) * | 2014-06-16 | 2016-02-10 | 中国南方电网有限责任公司超高压输电公司 | Ground wire ice melting automatic wiring device |
| CN104332929A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Single-ground wire ice melting method |
| CN105826889A (en) * | 2015-01-08 | 2016-08-03 | 罗日成 | Transmission line charged segmented DC ice melting method |
| CN104577927B (en) * | 2015-01-21 | 2017-01-25 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104734100A (en) * | 2015-04-08 | 2015-06-24 | 国家电网公司 | Rectifier valve bank unit of extra-high voltage ground wire direct-current deicing device |
| CN105262001A (en) * | 2015-11-24 | 2016-01-20 | 国网四川省电力公司电力科学研究院 | Ice melting method for overhead ground wire of power transmission line |
| CN105866642A (en) * | 2016-05-05 | 2016-08-17 | 中国电力科学研究院 | Method and system for performing pollution flashover testing on OPGW insulator chain |
| CN105911441A (en) * | 2016-05-05 | 2016-08-31 | 中国电力科学研究院 | Method and system for icing floashover test of OPGW insulator chain |
| CN106159798A (en) * | 2016-08-23 | 2016-11-23 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of transmission line of electricity connection in series-parallel mixing ground wire de-icing method |
| CN106169729A (en) * | 2016-08-23 | 2016-11-30 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of transmission line of electricity roundabout series connection ground wire de-icing method |
| CN107368650A (en) * | 2017-07-19 | 2017-11-21 | 武汉大学 | The method that quadrature analysis formulates tower linear system system ice-melt strategy |
| CN107368650B (en) * | 2017-07-19 | 2019-12-10 | 武汉大学 | Method for formulating tower line system ice melting strategy through orthogonal analysis |
| CN107658778A (en) * | 2017-10-08 | 2018-02-02 | 国网江西省电力公司电力科学研究院 | A kind of quick de-icing method of distribution network line |
| CN113708328A (en) * | 2021-08-24 | 2021-11-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Protection structure for photoelectric separator |
| CN113708328B (en) * | 2021-08-24 | 2023-05-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Protection structure for photoelectric separator |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Patentee after: Wuhan University Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation Patentee before: Wuhan University |