CN102780176B - Method for reducing insulation overhead ground wire induction voltage of alternating current transmission line - Google Patents

Method for reducing insulation overhead ground wire induction voltage of alternating current transmission line Download PDF

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Publication number
CN102780176B
CN102780176B CN201210234615.1A CN201210234615A CN102780176B CN 102780176 B CN102780176 B CN 102780176B CN 201210234615 A CN201210234615 A CN 201210234615A CN 102780176 B CN102780176 B CN 102780176B
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wire
insulated static
transposition
static wire
ground wire
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CN102780176A (en
Inventor
毛先胤
彭向阳
王建国
徐晓刚
姚森敬
许志海
王宇
王建平
李志峰
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Wuhan University WHU
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Wuhan University WHU
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Abstract

The invention relates to a method for reducing the insulation overhead ground wire induction voltage of an alternating current transmission line. The method comprises the following steps that the insulation overhead ground wire induction voltage limit value U<0> and the circuit current I are determined; when an insulation overhead ground wire grounding point is selected to be at one end part, the insulation overhead ground wire transposition pitch 1<0> is calculated to be (8-15)*U<0>/I<km>, and a nearby tension rod tower is selected every ten points from the end part of an insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition; and when the insulation overhead ground wire grounding point is positioned between two ends of the insulation overhead ground wire, the insulation overhead ground wire transposition pitch 2*1<0> is calculated to be (16-30)*U<0>/I(km), the nearby tension rod tower is selected every 2*1<0> from one end part of the insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition, and in addition, the insulation overhead ground wire grounding point is arranged nearby the half transposition pitch of one transposition node. The method has the advantage that the induction voltage can be reduced to be within the set induction voltage limit value U<0>.

Description

A kind of method reducing transmission line of alternation current insulated static wire induced voltage
Technical field
The present invention relates to a kind of method reducing transmission line of alternation current insulated static wire induced voltage, transmission line of alternation current insulated static wire induced voltage can be reduced and take office meaning limit value U 0within.
Background technology
Current insulated static wire mainly adopts the mode of insulation or single-point grounding completely, and when power transmission line overhead ground wire insulate completely, 500kV transmission line insulator overhead ground wire induced voltage reaches more than 40kV, and 220kV transmission line reaches more than 30kV.During insulated static wire (with above-mentioned insulated static wire) single-point grounding, the induced voltage on it increases along with insulated static wire length and increases, and generally also can reach thousands of volt.Too high insulated static wire induced voltage may cause ground insulator portable protective gaps to misplace the faults such as electric scaling loss ground insulator portable protective gaps, goes back the signals such as easy radio to external world and produces air interference, be also unfavorable for live line working on staff's tower in addition.
Although reduce above-mentioned induced voltage by wire, ground wire transposition method; but owing to lacking the pitch of transposition computational methods of science; so the inductive voltage value of each department insulated static wire exists larger difference, this makes troubles to the setting of ground insulator portable protective gaps distance.And if the setting of the distance of ground insulator portable protective gaps is improper; then may occur that ground insulator portable protective gaps misplaces the situation of electricity; also may because portable protective gaps recovery voltage is higher not easily arc extinguishing, ground insulator portable protective gaps may be burnt out time serious, even cause ground insulator to burst.In addition, because insulated static wire induced voltage lacks unified numerical value, operating personnel on tower is had less understanding to overhead ground wire induced voltage, easily causes security incident.
Summary of the invention
Technical problem to be solved by this invention, is just to provide a kind of method reducing transmission line of alternation current insulated static wire induced voltage, can reduce the induced voltage limit value U of induced voltage to setting arbitrarily 0within.
The present invention is for solving the problems of the technologies described above, and provide the method that two kinds are reduced transmission line of alternation current insulated static wire induced voltage, method one is only applicable to single go back to transmission line of alternation current, and method two is applicable to single time and common-tower double-return transmission line of alternation current.Method one mainly through setting wire, ground wire transposition pitch mode so that insulated static wire induced voltage is reduced to induced voltage limit value U 0within, its induced voltage is mainly reduced to induced voltage limit value U by the segmentation pitch setting insulated static wire by method two 0within.No matter be above-mentioned ex-situ operations or above-mentioned staged operation, it is all the relation utilizing induced voltage and insulated static wire length, the increasing degree of insulated static wire induced voltage is controlled, so two kinds of methods of the present invention belong to a total inventive concept by Controlling vertex pitch.
Reduce the method one of transmission line of alternation current insulated static wire induced voltage, it is characterized in that, comprise the steps:
S1) insulated static wire induced voltage limit value U is determined 0with line current I;
S2) select insulated static wire earth point in insulated static wire one end or be between insulated static wire two ends:
S2.1) if select insulated static wire earth point in one end
S2.11) calculating insulated static wire pitch of transposition is l 0=(8 ~ 15) * U 0/ I (km), every l from end described in insulated static wire 0place selects strain rod tower nearby to carry out ground wire transposition or wire transposition as transposition node;
S2.2) if select insulated static wire earth point to be between insulated static wire two ends
S2.21) calculating insulated static wire pitch of transposition is 2*l 0=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0place selects strain rod tower nearby to carry out ground wire transposition or wire transposition as transposition node, and is located at by described insulated static wire earth point near one of them transposition node half pitch of transposition.
Said method one essence comprises three kinds of modes of connection: one, insulated static wire transposition, namely only operates ground wire transposition; Two, single back transmission line wire transposition, namely only operates wire transposition; Three, insulated static wire and the coordinated transposition of single feedback electric lead, namely part transposition Nodes selects ground wire transposition, and another part then selects wire transposition.
Reduce the method two of transmission line of alternation current insulated static wire induced voltage, it is characterized in that, comprise the steps:
S1) insulated static wire induced voltage limit value U is determined 0with line current I;
S2) initial option insulated static wire earth point is located at each piecewise thread end and is also provided in the middle part of each segmentation ground wire:
S2.1) if select insulated static wire earth point at each piecewise thread end
S2.11) calculating insulated static wire segmentation pitch is l 0'=(8 ~ 15) * U 0/ I (km), every l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire homonymy end;
S2.2) if select insulated static wire earth point in the middle part of each segmentation ground wire
S2.21) calculating insulated static wire segmentation pitch is 2*l 0'=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire near middle.
The all single-point groundings of each segmentation ground wire of method two, are divided into some sections by whole piece insulated static wire, and between each section, insulation disconnects, and wherein every section forms one section of segmentation ground wire of the present invention.
The present invention has following beneficial effect: 1) the present invention is by calculating pitch of transposition or the segmentation pitch of insulated static wire, the induced voltage of the insulated static wire of transmission line of alternation current can be reduced any setting induced voltage limit value U to reduced levels 0within, convenient according to described induced voltage limit value U on the one hand 0the portable protective gaps of setting ground insulator, is conducive to protecting ground insulator; Within insulated static wire induced voltage is limited in a certain limit value on the other hand, be conducive to that the operation and maintenance personnel of transmission line are formed the existence of insulated static wire induced voltage to be clearly familiar with, simultaneously also for ensureing that the personal safety as well as the property safety of operating personnel on charged tower provides approach; Moreover, the induced voltage of insulated static wire is limited to the induced voltage limit value U of setting 0within, be conducive to weakening the radio interference that insulated static wire may cause;
2) method two of the present invention is applicable to single time and common-tower double-return transmission line of alternation current, applied widely; Method one of the present invention and method two provide available for different connection modes, earthing mode for reducing transmission line of alternation current insulated static wire induced voltage, and user can select flexibly according to actual conditions, has better practicality.
Accompanying drawing explanation
Fig. 1,2,3 is the structural representation of three kinds of concrete modes of connection of method one:
Fig. 1 is insulated static wire transposition, and wherein, Fig. 1 a is the situation of insulated static wire earth point in insulated static wire one end, and Fig. 1 b is the situation of insulated static wire earth point between insulated static wire two ends;
Fig. 2 is single back transmission line wire transposition, and wherein, Fig. 2 a is the situation of insulated static wire earth point in insulated static wire one end, and Fig. 2 b is the situation of insulated static wire earth point between insulated static wire two ends;
Fig. 3 is insulated static wire and the coordinated transposition of single feedback electric lead, and wherein, Fig. 3 a is the situation of insulated static wire earth point in insulated static wire one end, and Fig. 3 b is the situation of insulated static wire earth point between insulated static wire two ends;
Fig. 4 is an embodiment of the concrete mode of connection of method two: wherein, Fig. 4 a is the situation that insulated static wire earth point is located at each piecewise thread end, and Fig. 4 b is the situation that insulated static wire earth point is located in the middle part of each segmentation ground wire.
Embodiment
Below in conjunction with accompanying drawing, the mode of connection of inventing and four kinds concrete is further described: if the transmission line in Fig. 1-4 is all single time transmission line of alternation current, it is made up of a pair insulated static wire be arranged in parallel and a road three-phase conducting wire.
Fig. 1 is the concrete mode of connection of the inventive method one---the structural representation of the insulated static wire transposition mode of connection.The mode of connection being reduced induced voltage by insulated static wire transposition is applicable to single back transmission line that circuit is shorter, all fronts wire does not replace, insulated static wire single-point grounding, optionally connected place is an end of insulated static wire or is between two ends, respectively as shown in Fig. 1 a, 1b, concrete steps are as follows:
1-1) determine insulated static wire induced voltage limit value U 0with line current I;
1-2) select insulated static wire earth point in insulated static wire one end or be between insulated static wire two ends:
If 1-2.1) select insulated static wire earth point in one end
1-2.11) calculating insulated static wire pitch of transposition is l 0=(8 ~ 15) * U 0/ I (km), every l from end described in insulated static wire 0place selects strain rod tower nearby to carry out ground wire transposition as transposition node, as shown in Figure 1a;
If 1-2.2) select insulated static wire earth point to be between insulated static wire two ends
1-2.21) calculating insulated static wire pitch of transposition is 2*l 0=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0place selects strain rod tower nearby to carry out ground wire transposition as transposition node, and is located at by described insulated static wire earth point near one of them transposition node half pitch of transposition, as Fig. 1 b is located at apart from first transposition node half pitch of transposition place.
Fig. 2 is the concrete mode of connection of the inventive method one---the structural representation of single back transmission line wire transposition mode of connection.The replace difference of the mode of connection of itself and insulated static wire is, it is according to the position of selected insulated static wire earth point, and operation wire transposition, insulated static wire does not replace completely.Concrete difference step:
If 2-2.1) select insulated static wire earth point in one end
2-2.11) calculating insulated static wire pitch of transposition is l 0=(8 ~ 15) * U 0/ I (km), every l from end described in insulated static wire 0place selects strain rod tower nearby to carry out wire transposition as transposition node, as shown in Figure 2 a;
If 2-2.2) select insulated static wire earth point to be between insulated static wire two ends
2-2.21) calculating insulated static wire pitch of transposition is 2*l 0=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0place selects strain rod tower nearby to carry out wire transposition as transposition node, and is located at by described insulated static wire earth point near one of them transposition node half pitch of transposition, as Fig. 2 b is located at apart from first transposition node half pitch of transposition place.
Fig. 3 is the concrete mode of connection of the inventive method one---insulated static wire and single structural representation feeding back the electric lead coordinated transposition mode of connection.The replace difference of the mode of connection of itself and insulated static wire is, it is according to the position of selected insulated static wire earth point, in part transposition contact operation wire transposition, and another part transposition contact operation ground wire transposition.Because wire transposition and ground wire transposition have the effect of identical reduction insulated static wire induced voltage, ground wire transposition or wire transposition can be selected according to actual conditions, specifically as shown in Fig. 3 a, 3b at each transposition node.
Fig. 4 is the structural representation of the concrete mode of connection of the inventive method two.The mode of connection being reduced insulated static wire induced voltage by insulated static wire segmented mode needs all single-point groundings of every section of insulated static wire, optionally connected place is piecewise thread end or is in the middle part of segmentation ground wire, and method two of the present invention is applicable to single time and common-tower double-return transmission line of alternation current.Concrete steps are as follows:
4-1) determine insulated static wire induced voltage limit value U 0with line current I;
4-2) initial option insulated static wire earth point is located at each piecewise thread end and is also provided in the middle part of each segmentation ground wire:
If 4-2.1) select insulated static wire earth point at each piecewise thread end
4-2.11) calculating insulated static wire segmentation pitch is l 0'=(8 ~ 15) * U 0/ I (km), every l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire homonymy end, as shown in fig. 4 a;
If 4-2.2) select insulated static wire earth point in the middle part of each segmentation ground wire
4-2.21) calculating insulated static wire segmentation pitch is 2*l 0'=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire near middle, as shown in Figure 4 b.
The present invention compares measured value and the simulation value of In Guangdong Province part 500kV and 220kV transmission line of alternation current insulated static wire induced voltage, insulated static wire induced voltage after calculating conventional insulator overhead ground wire induced voltage and using the inventive method, both contrasts result, method of the present invention not only effectively can reduce transmission line of alternation current insulated static wire induced voltage, and insulated static wire induced voltage maximum can be made lower than any limit value.

Claims (2)

1. reduce a method for transmission line of alternation current insulated static wire induced voltage, it is characterized in that, comprise the steps:
S1) insulated static wire induced voltage limit value U is determined 0with line current I;
S2) select insulated static wire earth point in insulated static wire one end or be between insulated static wire two ends:
S2.1) if select insulated static wire earth point in one end
S2.11) calculating insulated static wire pitch of transposition is l 0=(8 ~ 15) * U 0/ I (km), every l from end described in insulated static wire 0place selects strain rod tower nearby to carry out ground wire transposition or wire transposition as transposition node;
S2.2) if select insulated static wire earth point to be between insulated static wire two ends
S2.21) calculating insulated static wire pitch of transposition is 2*l 0=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0place selects strain rod tower nearby to carry out ground wire transposition or wire transposition as transposition node, and is located at by described insulated static wire earth point near one of them transposition node half pitch of transposition.
2. reduce a method for transmission line of alternation current insulated static wire induced voltage, it is characterized in that, comprise the steps:
S1) insulated static wire induced voltage limit value U is determined 0with line current I;
S2) initial option insulated static wire earth point is located at each piecewise thread end and is also provided in the middle part of each segmentation ground wire:
S2.1) if select insulated static wire earth point at each piecewise thread end
S2.11) calculating insulated static wire segmentation pitch is l 0'=(8 ~ 15) * U 0/ I (km), every l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire homonymy end;
S2.2) if select insulated static wire earth point in the middle part of each segmentation ground wire
S2.21) calculating insulated static wire segmentation pitch is 2*l 0'=(16 ~ 30) * U 0/ I (km), every 2*l from insulated static wire one end 0' place selects strain rod tower nearby to carry out ground wire segmentation as segmented node, and insulated static wire earth point is located at each segmentation ground wire near middle.
CN201210234615.1A 2012-07-06 2012-07-06 Method for reducing insulation overhead ground wire induction voltage of alternating current transmission line Active CN102780176B (en)

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CN105958422A (en) * 2016-05-25 2016-09-21 国网辽宁省电力有限公司辽阳供电公司 Novel power transmission overhead ground wire lightning protection grounding method
CN111244872B (en) * 2020-03-22 2021-06-11 成都理工大学 Arrangement method of overhead ground wires of high-voltage transmission line

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN201549859U (en) * 2009-12-04 2010-08-11 西北电网有限公司 Grounded system of high-tension transmission line
CN202009212U (en) * 2010-12-14 2011-10-12 河南省电力勘测设计院 Ground wire transposition system of power transmission line

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201549859U (en) * 2009-12-04 2010-08-11 西北电网有限公司 Grounded system of high-tension transmission line
CN202009212U (en) * 2010-12-14 2011-10-12 河南省电力勘测设计院 Ground wire transposition system of power transmission line

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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