CN103151745A - Method for deicing by connecting double-side deicing overhead ground wires in series - Google Patents
Method for deicing by connecting double-side deicing overhead ground wires in series Download PDFInfo
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- CN103151745A CN103151745A CN2013100542208A CN201310054220A CN103151745A CN 103151745 A CN103151745 A CN 103151745A CN 2013100542208 A CN2013100542208 A CN 2013100542208A CN 201310054220 A CN201310054220 A CN 201310054220A CN 103151745 A CN103151745 A CN 103151745A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 36
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims description 61
- 230000008018 melting Effects 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 239000004020 conductor Substances 0.000 description 5
- 239000012212 insulator Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
Description
技术领域 technical field
本发明涉及架空地线融冰技术领域,尤其是一种双侧可融冰复合架空地线串联融冰的方法。 The invention relates to the technical field of ice-melting overhead ground wires, in particular to a method for melting ice in series with double-sided ice-melting composite overhead ground wires.
背景技术 Background technique
我国南方地区气候潮湿,冬季常降冻雨,输电导线在低气温下极易覆盖雨凇,相较于气候干燥的北方常见的雪淞密度更大,更不易脱落,给电网带来的灾害更为严峻。2008年1月南方大范围冰冻灾害带来了巨大的经济损失,也暴露了我国在输电线路融冰领域里面的不足。 The climate in southern my country is humid, and freezing rain often falls in winter. The transmission wires are easily covered with rime at low temperatures. Compared with the common snow rime in the dry north, it is more dense and less likely to fall off, which brings more disasters to the power grid. severe. In January 2008, the large-scale freezing disaster in the south brought huge economic losses, and also exposed our country's deficiencies in the field of ice melting for transmission lines.
架空地线与输电导线虽处同一环境下, 但输电导线本身载流发热, 故一般情况下架空地线上的覆冰厚度会远远超出输电导线上的厚度,更容易发生折断。折断的地线可能引发输电线路的短路或者接地故障,增加了导地线之间放电的风险。因此,地线的抗冰融冰技术受到了越来越多的关注。 Although the overhead ground wire and the transmission wire are in the same environment, the transmission wire itself carries current and generates heat. Therefore, under normal circumstances, the thickness of the ice coating on the overhead ground wire will far exceed the thickness of the transmission wire, and it is more likely to break. A broken ground wire may cause a short circuit or ground fault in the transmission line, increasing the risk of discharge between conductors and ground wires. Therefore, the anti-icing and melting technology of ground wire has received more and more attention.
把输电导线直流融冰技术引入架空地线融冰中,可以采用一根架空地线或者两根架空地线并联后与一根输电相线串联的方式融冰,但是这种情况下输电线路必须停运,给电网的调度带来极大地不便,也不能满足供电可靠性的要求;或者将普通架空地线连接到融冰电源的一侧,与大地构成回路的融冰方法,因为大地电阻很大,对融冰电源容量的要求很高,因此实际运用中不经济甚至不可行;同时,将架空地线中的两根铝包钢线简单串联融冰,也因其电阻大而难于实施。 Introducing the DC deicing technology of transmission conductors into the deicing of overhead ground wires, one overhead ground wire or two overhead ground wires connected in parallel and then connected in series with a transmission phase line can be used to melt ice, but in this case the transmission line must be The outage will bring great inconvenience to the dispatching of the power grid, and it cannot meet the requirements of power supply reliability; or connect the common overhead ground wire to one side of the ice-melting power supply, and form a circuit with the ground to melt ice, because the ground resistance is very large. Therefore, it is not economical or even feasible in practical application; at the same time, simply connecting two aluminum-clad steel wires in the overhead ground wire in series to melt ice is also difficult to implement because of its large resistance.
发明内容 Contents of the invention
本发明所要解决的技术问题是克服上述现有技术存在的缺陷,提供一种双侧可融冰复合架空地线串联融冰的方法,使双侧地线融冰时输电线路不需要停运且对直流融冰电源的容量要求不高,易于实现。 The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a method for melting ice in series with double-sided ice-melting composite overhead ground wires, so that the transmission line does not need to be shut down when the double-sided ground wires melt ice. The capacity requirement of the DC ice-melting power supply is not high, and it is easy to realize.
为此,本发明采用以下的技术方案:一种双侧可融冰复合架空地线串联融冰的方法,其特征在于,该方法的实施对象为两根复合架空地线,每根复合架空地线包括外绞层、内绞层和一股绝缘导线,在双侧地线电网中,两根复合架空地线的绝缘导线串联形成一回路,在融冰段一端短接,在融冰段另一端接直流融冰电源的两极,通过直流融冰电源的直流电流使绝缘导线产生热量,从而使覆盖在复合架空地线上的冰雪融化。融冰电源输出直流电流,可以避免线路感抗的影响,降低了对融冰电源容量的要求。 For this reason, the present invention adopts the following technical solutions: a method for melting ice in series with double-sided ice-melting composite overhead ground wires, which is characterized in that the implementation object of the method is two composite overhead ground wires, each composite overhead ground The wire includes an outer twisted layer, an inner twisted layer and an insulated wire. In the double-sided ground wire grid, the insulated wires of the two composite overhead ground wires are connected in series to form a loop, which is short-circuited at one end of the ice-melting section and connected at the other end of the ice-melting section. One end is connected to the two poles of the DC ice-melting power supply, and the DC current of the DC ice-melting power supply makes the insulated wire generate heat, thereby melting the ice and snow covered on the composite overhead ground wire. The ice-melting power supply outputs DC current, which can avoid the influence of line inductance and reduce the requirement on the capacity of the ice-melting power supply.
进一步,所述的复合架空地线包括外绞层和内绞层,所述的外绞层由多股呈周向分布的外层铝包钢线组成,所述的内绞层由多股呈周向分布的内层铝包钢线组成,所述的一股绝缘导线绞入内绞层中。考虑绝缘导线防雷性不及铝包钢线,一般设置在地线内部(即绞入内绞层中),避免直接遭受雷击。 Further, the composite overhead ground wire includes an outer twisted layer and an inner twisted layer, the outer twisted layer is composed of a plurality of outer layers of aluminum-clad steel wires distributed in the circumferential direction, and the inner twisted layer is composed of a plurality of strands in the form of The inner layer is composed of aluminum-clad steel wires distributed circumferentially, and the one strand of insulated wire is twisted into the inner twisted layer. Considering that the lightning protection of insulated wires is not as good as that of aluminum-clad steel wires, they are generally installed inside the ground wire (that is, twisted into the inner twisted layer) to avoid direct lightning strikes.
进一步,所述的绝缘导线为表面包裹绝缘层的铜导线,铜的电阻较小,对直流融冰电源的容量要求不高,易于实现。绝缘导线的线径以及绝缘层的厚度根据导线热容量计算得出,绝缘层满足10kV耐压。 Further, the insulated wire is a copper wire with an insulating layer wrapped on the surface, and the resistance of copper is small, and the capacity requirement for the DC ice-melting power supply is not high, and it is easy to implement. The wire diameter of the insulated wire and the thickness of the insulating layer are calculated according to the heat capacity of the wire, and the insulating layer meets the withstand voltage of 10kV.
进一步,所述的直流融冰电源为连续可调的电源,根据实际覆冰情况及融冰时期进行调整,从而对融冰时间和能量损耗进行权衡优化。 Further, the DC ice-melting power supply is a continuously adjustable power supply, which is adjusted according to the actual ice-covering situation and the ice-melting period, so as to balance and optimize the ice-melting time and energy loss.
进一步,所述复合架空地线的接地方式为在融冰段上逐点接地或全线绝缘,逐点接地可以增强防雷效果,全线绝缘可以减小环流损耗。 Further, the grounding method of the composite overhead ground wire is point-by-point grounding or full-line insulation on the ice-melting section. Point-by-point grounding can enhance the lightning protection effect, and full-line insulation can reduce circulation loss.
进一步,所述的复合架空地线中复合有光纤单元,利用光纤单元进行光纤通信或光纤测温。 Further, the composite overhead ground wire is compounded with an optical fiber unit, and the optical fiber unit is used for optical fiber communication or optical fiber temperature measurement.
本发明的有益效果在于:含有一股绝缘导线的复合架空地线实现了自循环融冰,即双侧地线内的绝缘导线串联融冰,地线融冰时输电电路不需要停运;两股绝缘导线的串联直流电阻不大,对直流融冰电源的容量要求不高,易于实现。 The beneficial effect of the present invention is that: the composite overhead ground wire containing one insulated wire realizes self-circulation melting of ice, that is, the insulated wires in the double-sided ground wire are connected in series to melt ice, and the power transmission circuit does not need to be shut down when the ground wire melts; The series DC resistance of the strand insulated conductors is small, and the capacity requirement of the DC ice-melting power supply is not high, which is easy to realize.
附图说明 Description of drawings
图1是本发明所述的复合架空地线的横截面示意图。 Fig. 1 is a schematic cross-sectional view of a composite overhead ground wire according to the present invention.
图2是本发明双侧地线串联融冰方法的接线图,采用的是地线逐点接地的接地方式。 Fig. 2 is a wiring diagram of the method for melting ice in series with ground wires on both sides of the present invention, which adopts a point-by-point grounding method of ground wires.
图3是本发明双侧地线串联融冰方法的接线图,采用的是地线在融冰段上全线绝缘的接地方式。 Fig. 3 is a wiring diagram of the method for melting ice in series with ground wires on both sides of the present invention, which adopts a grounding method in which the ground wires are fully insulated on the ice-melting section.
图中,1,2-复合架空地线,3,4-绝缘导线,5,6-接续塔,7-带间隙的耐张绝缘子串,8-悬垂绝缘子串,9-外层铝包钢线,10-内层铝包钢线,11-中心铝包钢线,12-直流融冰电源。 In the figure, 1, 2- composite overhead ground wire, 3, 4- insulated wire, 5, 6- connection tower, 7- tension insulator string with gap, 8- suspension insulator string, 9- outer aluminum-clad steel wire , 10-inner aluminum-clad steel wire, 11-center aluminum-clad steel wire, 12-DC ice-melting power supply.
具体实施方式 Detailed ways
下面结合说明书附图对本发明做进一步详细描述。 The present invention will be described in further detail below in conjunction with the accompanying drawings.
如图1所示的复合架空地线2,其由12股外层铝包钢线9、5股内层铝包钢线10、1股绝缘导线3及一股位于地线中心处的中心铝包钢线11绞制而成,12股呈周向分布的外层铝包钢线组成外绞层,5股呈周向分布的内层铝包钢线组成内绞层,所述的一股绝缘导线绞入内绞层中。复合架空地线1的结构与复合架空地线2的结构相同。
Composite overhead ground wire 2 as shown in Figure 1, it consists of 12 strands of outer layer aluminum-
本发明方法的原理如图2所示,在一个融冰段内,带有一股绝缘导线3的复合架空地线2和带有一股绝缘导线4的复合架空地线1经过若干个接续塔6,复合架空地线既可以逐点接地,如图2所示;也可以根据需要全线绝缘,如图3所示。
The principle of the method of the present invention is as shown in Figure 2, in a melting section, the composite overhead ground wire 2 with one
在接续塔5处通过带间隙的耐张绝缘子串7引出的复合架空地线1和2,其中的绝缘导线3和4在融冰段的一侧两者短接,另一侧与相应直流融冰电源的正负极相连。
Composite overhead ground wires 1 and 2 lead out through tension insulator strings 7 with gaps at the
根据线路参数、外部气温、空气湿度、风速等影响因素计算出最大融冰电流和最小融冰电流,根据需要选择合适的融冰电流;要求融冰直流电源的电流大小是连续可调的,能根据覆冰情况和融冰的阶段进行合理的调整,同时具有抗冰与融冰的作用,使融冰时间和融冰耗能上得到优化。 Calculate the maximum ice-melting current and the minimum ice-melting current according to the line parameters, external air temperature, air humidity, wind speed and other influencing factors, and select the appropriate ice-melting current according to the needs; the current size of the ice-melting DC power supply is required to be continuously adjustable, and can Reasonable adjustments are made according to the ice-covering situation and the ice-melting stage. At the same time, it has the functions of anti-icing and ice-melting, so that the ice-melting time and energy consumption of ice-melting are optimized. the
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CN103390874A (en) * | 2013-07-24 | 2013-11-13 | 国家电网公司 | Deicing method for deicing optical fiber composite overhead ground wire wound by insulated wires |
CN105207161A (en) * | 2015-10-30 | 2015-12-30 | 国网浙江省电力公司电力科学研究院 | Double earth wire ice melting system |
CN106329385A (en) * | 2015-07-03 | 2017-01-11 | 中国电力科学研究院 | OPGW icing thickness measuring method and measuring device |
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Application publication date: 20130612 |