CN101908750B - Self-adaptively grounded lightning wire deicing circuit - Google Patents
Self-adaptively grounded lightning wire deicing circuit Download PDFInfo
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- CN101908750B CN101908750B CN2010102488755A CN201010248875A CN101908750B CN 101908750 B CN101908750 B CN 101908750B CN 2010102488755 A CN2010102488755 A CN 2010102488755A CN 201010248875 A CN201010248875 A CN 201010248875A CN 101908750 B CN101908750 B CN 101908750B
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- 238000010586 diagram Methods 0.000 description 3
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- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 3
- 206010019133 Hangover Diseases 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
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- 230000002045 lasting effect Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The invention discloses a self-adaptively grounded lightning wire deicing topology. The topology comprises a controllable current source, a disconnector, a direct current sensor, and two direct current control contactors and two lightning wire insulators arranged on each tower. The controllable current source is connected with the head end of the lightning wire through the disconnector, the tail end of the lightning wire is short-circuited, and the short-circuited point is provided with the direct current sensor; coils of the direct current control contactors are connected in series with the lightning wire; one end of a main contact is connected with the lightning wire, while the other end is grounded through the tower; and one end of each lightning wire insulator is connected with the lightning wire, while the other end is grounded through the tower. The topology makes the lightning wire reliably grounded at ordinary times, and supplies direct current to the lightning wire during deicing so as to make the lightning wire automatically ungrounded; and the topology can periodically test the direct current control contactors when the lightning wire is not coated with ice, so that the topology is convenient and reliable to operate. The invention provides a safe, high-efficiency, convenient and reliable method for solving the problem of controlling the deicing of the grounded lightning wire.
Description
Technical field
The present invention relates to the lightning wire deicing topology of lightning conducter topology, especially adaptive earthing in the power system transmission line.
Background technology
Power industry is a basic energy resource industry important in the national economic development, is the basic industry that concerns national energy security and lifelines of the national economy.Along with the sustainable development of Chinese national economy, economical sound development and daily life all more and more closely link together with power industry, guarantee that the lasting, stable of supply of electric power just seems particularly important.Because electrical network is subjected to the supply of electric power interruption that the inside and outside various factors influence of system causes, and often causes enormous economic loss, has a strong impact on people's normal life.
At the beginning of 2008, most of area, China south has experienced low temperature sleet freezing weather rarely seen in the history.Cause transmission line large tracts of land icing, electric power facility is badly damaged, and causes large-area power-cuts.Only this disaster just causes State Grid Corporation of China to have jurisdiction over the electrical network direct economic loss reaching 104.5 hundred million yuan.
The ice and snow disaster to the influence of power supply transmission line mainly aspect insulation and two of gravity laods: when the former is serious even ice sudden strain of a muscle short circuit takes place, cause line tripping; Can cause considerable damages such as circuit broken string, shaft tower lodging and initiation large area blackout when the latter is serious, and impaired electrical network often is difficult to recover at short notice.Owing to when meteorological reason causes the circuit icing to be difficult to melt voluntarily,, need manual intervention that the circuit icing is removed in order to prevent the generation of large area blackout.
At present, more to the deicing technological means of transmission pressure, can be divided into mechanical external force deicing and big electric current thermal ice-melting two big classes substantially, this two classes deicing technology is all to have obtained abundant achievement in theoretical research or the engineering practice.Especially big electric current thermal ice-melting more and more is widely used with its advantage safely and efficiently.
Ultra-high-tension power transmission line generally also is furnished with lightning conducter except that transmission pressure, lightning conducter is also the same with transmission pressure under the freezing condition of low temperature sleet also the icing phenomenon can to take place.The lightning conducter icing is than the seriousness of transmission pressure icing: lightning conducter is set up in transmission pressure top, when the weight icing its to the load moment of shaft tower greater than transmission line; Lightning conducter need pass through tower grounding in order to reach the lightning protection purpose, can't directly feed big electric current and carry out ice-melt.
Summary of the invention
The purpose of this invention is to provide a kind of lightning wire deicing topology, make lightning conducter not carry out ice-melt when operation reliable ground, feed direct current during the ice-melt operation and can break away from the ground connection operation automatically with adaptive earthing function.
The lightning wire deicing topology of adaptive earthing of the present invention is characterized in that comprising: controllable current source, disconnecting link, DC current sensor and be installed in 2 DC control contactors and 2 lightning conducter insulators on the every shaft tower.The positive pole of controllable current source links to each other with first lightning conducter head end by disconnecting link, and negative pole links to each other with second lightning conducter head end by disconnecting link, the terminal short circuit of first, second two lightning conducters, and DC current sensor is installed on the short circuit point of two lightning conducters; Every DC control contactor comprises: coil, main contact and 2 protection gaps over the ground, and 2 protection gaps over the ground lay respectively at the coil both sides; The coil of first DC control contactor is connected with first lightning conducter, the operating current direction of this coil is consistent with the output current direction of controllable current source, one end of first DC control main noddle on contactor links to each other with the operating current output of this contactor coil, and the other end of main contact links to each other with shaft tower and ground connection; The coil of second DC control contactor is connected with second lightning conducter, the operating current direction of this coil is consistent with the output current direction of controllable current source, one end of second DC control main noddle on contactor links to each other with the operating current input of this contactor coil, and the other end of main contact links to each other with shaft tower and ground connection.First lightning conducter insulator one end connects first lightning conducter, and the other end connects shaft tower and ground connection; Second lightning conducter insulator one end connects second lightning conducter, and the other end connects shaft tower and ground connection.
Beneficial effect of the present invention is:
Lightning conducter in the lightning wire deicing topology of adaptive earthing can break away from ground connection automatically when carrying out the ice-melt operation, simple and reliable; Adopt direct current that lightning conducter is carried out ice-melt, ice-melt efficient height, speed is fast; Can monitor the ground wire grounding state in real time when ice-melt, also can regularly break away from grounding function to lightning conducter when not ice-melt and test, lightning conducter not icing also can be tested convenient and reliable operation.The present invention provides a cover safety, efficient, convenient, reliable method for solution lightning wire deicing problem.
Description of drawings
Fig. 1 is the lightning wire deicing topology theory structure schematic diagram of adaptive earthing.
Lightning conducter broke away from ground connection process schematic diagram when Fig. 2 was ice-melt.Wherein a figure feeds operating current, and the shaft tower place nearest at the distance current source forms current circuit; B figure breaks away from ground connection at the nearest shaft tower of distance current source place, electric current turns to next shaft tower; C figure is that all shaft towers all break away from ground connection, and electric current is raised to specified ice melting current.
Lightning conducter flow through the lightning current schematic diagram when Fig. 3 was the thunderbolt lightning conducter.
Embodiment
With reference to Fig. 1, the lightning wire deicing topology of adaptive earthing of the present invention comprises: controllable current source 1, disconnecting link 2, DC current sensor 3 and be installed in 2 DC control contactor 4-1,4-2 and 2 lightning conducter insulator 5-1,5-2 on the every shaft tower 7.In the illustrated example, 3 shaft towers 7 are arranged, represent the 1st, 2 shaft tower and last root shaft tower on the transmission line respectively, "+" end expression operating current of coil Y flows into end.The positive pole of controllable current source 1 links to each other with first lightning conducter 6-1 head end by disconnecting link 2, negative pole links to each other with second lightning conducter 6-2 head end by disconnecting link 2, the terminal short circuit of first, second two lightning conducter 6-1,6-2, DC current sensor 3 is installed on the short circuit point of two lightning conducters.
Every DC control contactor comprises: coil Y, main contact C and 2 protection gap A over the ground, and 2 protection gap A over the ground lay respectively at coil Y both sides; The coil Y of first DC control contactor 4-1 connects with first lightning conducter 6-1, the operating current direction of this coil Y is consistent with the output current direction of controllable current source 1, the end of first DC control contactor 4-1 main contact C links to each other with the operating current output of this contactor coil Y, and the other end of main contact C links to each other with shaft tower 7 and ground connection;
The coil Y of second DC control contactor 4-2 connects with second lightning conducter 6-2, the operating current direction of this coil Y is consistent with the output current direction of controllable current source 1, the end of second DC control contactor 4-2 main contact C links to each other with the operating current input of this contactor coil Y, and the other end of main contact C links to each other with shaft tower 7 and ground connection;
First lightning conducter insulator 5-1 one end connects first lightning conducter 6-1, and the other end connects shaft tower 7 and ground connection; Second lightning conducter insulator 5-2 one end connects second lightning conducter 6-2, and the other end connects shaft tower 7 and ground connection.
Above-mentioned protection gap A over the ground is made of two electrodes that leave the gap, or lightning arrester.
In conjunction with Fig. 1, the nominal parameter of each element is selected and should be considered: the main contact C of DC control contactor is the time-delay break contact of one or more series connection, and delayed setting is for decaying to the maximum hangover time below the operating current greater than lightning current; Coil Y rated current is set at specified ice melting current, and coil Y operation current calibration is less than the contactor maximum breaking current; Protection gap A rated voltage is adjusted and is sensed the induced potential sum of lightning conducter for escaping ice-melt voltage and transmission pressure, and puncture voltage guarantees reliably to puncture at the thunder and lightning pilot stage; The disconnecting link rated current is specified ice melting current.
Operation principle describes in conjunction with Fig. 2, and 3 shaft towers are arranged in Fig. 2 example, represents on the transmission line the 1st, 2 and last root shaft tower respectively.At ordinary times, lightning conducter is by main contact C reliable ground, during ice-melt, carries out according to following four steps:
Step 1: operating personnel's disconnecting link that closes, regulate controllable current source 1 and feed electric current to lightning conducter, it is identical to require this moment electric current to equal the operating current and the direction of coil Y of DC control contactor, because the DC control contactor of whole piece circuit is all put at institute's vicinal and is made ground wire grounding at this moment, so forming current circuit by first shaft tower place, electric current (sees Fig. 2 a), operating current flows through coil Y, and main contact C time-delay is disconnected, and makes this shaft tower place lightning conducter break away from ground connection.Afterwards, operating current can turn to next root shaft tower place to form current circuit (seeing Fig. 2 b), and also makes this shaft tower place lightning conducter break away from ground connection.By that analogy, the all DC control contactors of whole piece circuit all can make it connect lightning conducter disengaging ground connection successively, operating current short circuit place endways forms current circuit (seeing Fig. 2 c), and is detected by DC current sensor 3, and the whole piece lightning conducter breaks away from the ground connection operation.
Step 2: operating personnel monitor the measured value of DC current sensor 3, if equate with the output current value of controllable current source 1, prove that all main contact C of whole piece circuit disconnect, can proceed operation, proof has the tripping of DC control contactor fault if do not wait then, should stop ice-melt immediately;
Step 3: after all main contact C of whole piece lightning conducter have disconnected, operating personnel regulate ice melting current and rise to the specified ice melting current of circuit, beginning ice-melt operation, utilize the thermal effect of direct current to melt icing on the lightning conducter, should monitor the measured value of DC current sensor 3 in the operation in real time, if not waiting then prove with the output valve of controllable current source 1 has DC control contactor fault to make ground wire grounding, should stop ice-melt immediately;
Step 4: after ice-melt finished, operating personnel regulated ice melting current and reduce to 0, disconnected disconnecting link 2.
During periodical test, except that step 3 need not be carried out, all the other steps and ice-melt operation were identical during operation.The effect of protection gap A is exactly when thunderbolt takes place lightning conducter, prevents that lightning current from scurrying into coil Y, and protection coil Y avoids the lightning current impact.When thunderbolt took place lightning conducter, in conjunction with Fig. 3, most of lightning current can flow into the earth along the gap A of protection over the ground and the lightning strike spot one side main contact C of the both sides of lightning strike spot shown in Fig. 3, but still has a small amount of lightning current through lightning strike spot opposite side coil Y.Because the main contact C that this coil Y is controlled disconnects time-delay (the main contact C that coil Y is controlled on the right side among the figure does not draw) is arranged, delayed setting is for decay to the maximum hangover time below the operating current greater than lightning current, so can misoperation under the effect of lightning current.Otherwise the misoperation meeting causes main contact C to disconnect lightning current by force, causes contact to burn.
Claims (2)
1. the lightning wire deicing circuit of adaptive earthing, it is characterized in that comprising: controllable current source (1), disconnecting link (2), DC current sensor (3) and be installed in 2 DC control contactor (4-1 on the every shaft tower (7), 4-2) with 2 lightning conducter insulator (5-1,5-2), the positive pole of controllable current source (1) links to each other with first lightning conducter (6-1) head end by disconnecting link (2), negative pole links to each other with second lightning conducter (6-2) head end by disconnecting link (2), first, the second two lightning conducter (6-1,6-2) terminal short circuit, DC current sensor (3) is installed on the short circuit point of two lightning conducters; Every DC control contactor comprises: coil (Y), main contact (C) and 2 protection gaps (A) over the ground, and 2 protection gaps (A) over the ground lay respectively at coil (Y) both sides; The coil (Y) of first DC control contactor (4-1) is connected with first lightning conducter (6-1), the operating current direction of this coil (Y) is consistent with the output current direction of controllable current source (1), one end of first DC control contactor (4-1) main contact (C) links to each other with the operating current output of this contactor coil (Y), and the other end of main contact (C) links to each other with shaft tower (7) and ground connection; The coil (Y) of second DC control contactor (4-2) is connected with second lightning conducter (6-2), the operating current direction of this coil (Y) is consistent with the output current direction of controllable current source (1), one end of second DC control contactor (4-2) main contact (C) links to each other with the operating current input of this contactor coil (Y), the other end of main contact (C) links to each other with shaft tower (7) and ground connection, first lightning conducter insulator (5-1) end connects first lightning conducter (6-1), and the other end connects shaft tower (7) and ground connection; Second lightning conducter insulator (5-2) end connects second lightning conducter (6-2), and the other end connects shaft tower (7) and ground connection.
2. the lightning wire deicing circuit of adaptive earthing according to claim 1 is characterized in that said protection gap (A) over the ground is to be made of two electrodes that leave the gap, or lightning arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102488755A CN101908750B (en) | 2010-08-06 | 2010-08-06 | Self-adaptively grounded lightning wire deicing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102488755A CN101908750B (en) | 2010-08-06 | 2010-08-06 | Self-adaptively grounded lightning wire deicing circuit |
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| Publication Number | Publication Date |
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| CN101908750A CN101908750A (en) | 2010-12-08 |
| CN101908750B true CN101908750B (en) | 2011-11-30 |
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| CN2010102488755A Expired - Fee Related CN101908750B (en) | 2010-08-06 | 2010-08-06 | Self-adaptively grounded lightning wire deicing circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136715B (en) * | 2011-01-24 | 2012-12-05 | 浙江大学 | Passive ground wire ice-melting controller |
| CN115498582B (en) * | 2022-10-21 | 2024-06-11 | 国网湖南省电力有限公司 | Uninterrupted ground wire direct-current deicing system and uninterrupted ground wire direct-current deicing method for ultra-high voltage transmission line |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166836A (en) * | 2005-12-15 | 2007-06-28 | Tokyo Electric Power Services Co Ltd | Snow and ice falling-off prevention device |
| CN101286629A (en) * | 2008-02-13 | 2008-10-15 | 郑卫东 | A device for covering surface of melting wires, poles and insulators in transmission line with ice |
| CN101299528B (en) * | 2008-03-12 | 2010-08-18 | 华旭东 | Method for deicing ground wire of high tension overhead transmission line |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166836A (en) * | 2005-12-15 | 2007-06-28 | Tokyo Electric Power Services Co Ltd | Snow and ice falling-off prevention device |
| CN101286629A (en) * | 2008-02-13 | 2008-10-15 | 郑卫东 | A device for covering surface of melting wires, poles and insulators in transmission line with ice |
| CN101299528B (en) * | 2008-03-12 | 2010-08-18 | 华旭东 | Method for deicing ground wire of high tension overhead transmission line |
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| CN101908750A (en) | 2010-12-08 |
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Granted publication date: 20111130 |