CN105529651A - 500kV power transmission line conductor capacity-increasing transformation method - Google Patents
500kV power transmission line conductor capacity-increasing transformation method Download PDFInfo
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- CN105529651A CN105529651A CN201610109321.4A CN201610109321A CN105529651A CN 105529651 A CN105529651 A CN 105529651A CN 201610109321 A CN201610109321 A CN 201610109321A CN 105529651 A CN105529651 A CN 105529651A
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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
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Abstract
The invention relates to a 500kV old line transformation technology, and discloses a 500kV power transmission line heat-resistant conductor capacity-increasing transformation method. The 500kV power transmission line conductor capacity-increasing transformation method specifically refers to replacing a conductor of a 500kV old line on the basis of an original tower, and comprises the step of selecting a conductor having a capacity-increasing capability and capable of transmitting current required by a power transmission line according to the conductor of the original line, wherein weight of the new conductor is close to that of the original conductor, arc sag of the new conductor when transmitting rated current is not greater than arc sag allowed by the original conductor, the maximum working tension of the new conductor is not greater than that of the original conductor, the new conductor can withstand 30 years of long-term operation, and the new conductor and supporting fittings are convenient to install. The 500kV power transmission line conductor capacity-increasing transformation method does not need to replace the tower, and reduces the difficulty of construction.
Description
Technical field
The present invention relates to 500kV old circuit renovation technique field, particularly a kind of 500kV transmission line heat-resisting wire capacity-increasing transformation method.
Background technology
In recent years, along with social economy maintains sustained and rapid growth, power load rapid development, improves constantly the requirement of power delivery capacity, and a lot of old circuit of 500kV can't bear the heavy load at present, it is commonplace that large power supply sends circuit and load center incoming line phenomenon of " seizing by the throat ", there is the problem of " can not send, can not fall any more, do not use " to a certain extent, restrictive function is obvious, is difficult to the actual needs meeting growing people's productive life.Therefore, in the situations such as peak times of power consumption and part line fault, on the basis of existing line, how to improve the problem that circuit conveying capacity becomes in the urgent need to address.
Since China in 1981 the 1st article of 500kV table mountain-Wuhan transmission line puts into operation, through the development of nearly 30 years, 500kV electrical network covered the whole province of China, was one of worldwide largest 500kV AC electric power systems.
500kV electrical network is the main grid structure of China's electrical network, is to optimize electric power resource configuration, carries out foundation that is transregional, power transmission transprovincially.Along with the development of power grid construction, the reinforcement of regional power grid structure, the average conveying capacity of 500kV alternating current circuit has brought up to current about 2000MW, but along with the quick growth of power load, 500kV transmission line ability of supplying electric power demonstrates flaccid state.
Along with the reinforcement that regional power grid is interconnected, require to reach more than 3000MW to the transmission capacity of 500kV main grid structure, as can be seen here, 500kV multi-line power transmission ability is obviously not enough, this is not only difficult to meet growing growth of the national economic and people's lives electricity consumption, and great waste is caused to electric power resource, directly impact transprovincially, transregional power transmission dynamics, reduce regional power grid interconnected effect.
Therefore, improve the conveying capacity of 500kV electrical network, namely very urgent to the transformation of 500kV old transmission line capacity increasing technique.
Summary of the invention
Goal of the invention of the present invention is: the technical problem that there is ability to transmit electricity deficiency for the old circuit of 500kV of the prior art, the invention discloses a kind of 500kV transmission line heat-resisting wire capacity-increasing transformation method.
The technical solution used in the present invention is such:
A kind of 500kV transmission line heat-resisting wire capacity-increasing transformation method, it is specially the wire changing the old circuit of 500kV on the basis of original shaft tower, it specifically comprises the following steps: the wire according to original circuit, selects to possess compatibilization ability and can the wire of electric current of transmission line requirement; Weight and the former wire of new wire are close; The sag of new wire when transmitting rated current is not more than the sag that former wire allows; New wire maximum working tension is not more than former wire; New wire can bear long-time running in 30 years; New wire and assorted golden tool are convenient to install.
Further, described new wire is selected from aluminium Baogang core heat-resisting aluminium alloy twisted wire, the shaping aluminium stranded conductor of aluminium Baogang core heat-resisting aluminium alloy, aluminium bag invar steel core heat-resisting aluminium alloy twisted wire, clearance type extra-heavy steel core heat-resisting aluminium alloy twisted wire, Heatproof aluminum-alloy stranded wire of carbon fiber composite core, extra-heavy steel reinforced soft aluminum strand or middle strength aluminium alloy wire.
Further, said method also comprises and judges whether alternative wire maximum carrying capacity at a set temperature meets the requirement of the highest transmission capacity of the power transformation station equipment of power transformation more after exchange device, thus rejects undesirable alternative wire.
Further, said method also comprises the specified stretching resistance judging alternative wire, thus rejects the alternative wire that specified stretching resistance is less than former wire.
Further, said method also comprises the requirement judging to carry 4000A electric current under can alternative wire meet limiting case, is retain this alternative wire, otherwise, reject this alternative wire.
Further, said method also comprises the sag judging alternative wire and whether is less than former wire at a set temperature, is, retains this alternative wire, otherwise rejects this alternative wire.
Further, said method also comprises the annual cost of more satisfactory alternative wire, selects new wire according to useful life and annual cost.
Further, above-mentioned former wire is LGJ-400/35 steel reinforced aluminium conductor, and the new wire of selection is aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35.
Further, above-mentioned LGJ-400/35 steel reinforced aluminium conductor is quadripartion.
Further, above-mentioned aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35 comprises 24 aluminum steels and 7 steel wires.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: do not need to change shaft tower, only change novel compatibilized wire, reduce difficulty of construction and cost, quantities is relatively little, is the preferred option of transmission line heat-resisting wire capacity-increasing transformation.Existing usual manner generally comprises removes old circuit (comprising steel tower), then adopts the tower mated with common large-section lead to carry out reconstruction completely; The basis as far as possible utilizing former built shaft tower is changed common large-section lead (loosening tension force), and adopting increases straight line pole and solves tower load and surpass design condition and the larger problem of sag; Adopt former wire, raise indivedual shaft tower scheme.But the cost of these schemes is all higher, the present invention does not need to change or adjustment shaft tower, only changes novel compatibilized wire, reduces difficulty of construction and cost.Feature of the present invention is on the basis of original tower bar, select suitable capacity-improving conducting wires to realize capacity-increasing transformation, and cost is low, and difficulty of construction is little.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below for the quadripartion LGJ-400/35 steel reinforced aluminium conductor that 500kV transmission line is the most frequently used, replacing novel conductive wire capacity-increasing transformation is carried out to circuit and analyzes.
The invention discloses a kind of 500kV transmission line heat-resisting wire capacity-increasing transformation method, it is specially the wire changing the old circuit of 500kV on the basis of original shaft tower, it specifically comprises the following steps: the wire according to original circuit, selects wire to possess compatibilization ability and can the wire of electric current of transmission line requirement; The weight of described new wire is not more than former wire; The sag of described new wire when transmitting rated current is not more than the sag that former wire allows; Described new wire maximum working tension is not more than former wire; Described new wire can bear long-time running in 30 years, and wire producer can carry out the test of wire endurance, judges whether to bear long-time running in 30 years according to test situation.
Further, described new wire is selected from aluminium Baogang core heat-resisting aluminium alloy twisted wire (abbreviation heat-resisting wire), the shaping aluminium stranded conductor of aluminium Baogang core heat-resisting aluminium alloy (being called for short heat-resisting molded line), aluminium bag invar steel core heat-resisting aluminium alloy twisted wire (being called for short invar wire), clearance type extra-heavy steel core heat-resisting aluminium alloy twisted wire (abbreviation clearance conductor), Heatproof aluminum-alloy stranded wire of carbon fiber composite core (abbreviation carbon-fibre wire), extra-heavy steel reinforced soft aluminum strand (abbreviation soft aluminum conductor) or middle strength aluminium alloy wire.
For ensureing under high-power power delivery mode, the stable operation of high-voltage alternating system when N-1 or N-2 catastrophe failure occurs on partial line road in net, limit by 500kV transformer rated capacity, the limit conveying electric current of 500kV transmission line is 4000A.
Carry electric current 4000A initial option 10 kinds of different conductors to carry out the characterisitic parameters such as structure, weight, intensity, sag, ampacity, ageing properties according to the limit to compare.
Table 1 is participated in the election of wire parameter list
From upper table, visible:
1) external diameter of selected wire is not more than raw steel core aluminum stranded wire;
2) weight of wire and former wire difference little, be generally less than former wire;
3) the specified stretching resistance of all participation in the election wires except soft aluminum conductor is all not less than raw steel core aluminum stranded wire;
4) all participation in the election wires except middle strength aluminium alloy wire are under ambient temperature is 40 DEG C and 35 DEG C of situations, and maximum carrying capacity is all greater than 1000A, meet the requirement of the highest transmission capacity of the power transformation station equipment of power transformation more after exchange device.
Further, said method also comprises and judges whether alternative wire maximum carrying capacity at a set temperature meets the requirement of the highest transmission capacity of the power transformation station equipment of power transformation more after exchange device, thus rejects undesirable alternative wire.
Further, said method also comprises the specified stretching resistance judging alternative wire, thus rejects the alternative wire that specified stretching resistance is less than former wire.
After transformation, by under ambient temperature 35 DEG C and 40 DEG C of situations, calculate conductor temperature now to participating in respectively than 10 kinds of wires of choosing, simultaneously also according to the maximum delivery electric current 4000A allowed, calculate the temperature of wire in ambient temperature 35 DEG C and 40 DEG C of two kinds of situations, result of calculation is as following table:
Table 2 is participated in the election of wire transmission capacity table
Note: heat-resisting wire allowable temperature 150 DEG C, plain conductor 70 DEG C
The maximum temperature that comparison between calculation results and each wire allow is visible, from above result, carries the requirement of 4000A electric current under all participation in the election wires except middle strength aluminium alloy wire all can meet limiting case.
Further, said method also comprises the requirement judging to carry 4000A electric current under can alternative wire meet limiting case, is retain this alternative wire, otherwise, reject this alternative wire.
Table 3 participate in the election of wire sag contrast
From calculating comparative result above:
Limit conveying 4000A current time gap wire JNRLH1S/EST-370/40, invar wire JNRLH1/LBY10-290/55, carbon-fibre wire JLRX/T-400/45 sag are all less than the sag of LGJ-400/35; The sag characteristic of heat-resisting molded line JNRLH60X/LB14-350/35 sag and LGJ-400/35 is substantially suitable; Under all the other wire limiting cases, sag is all obviously greater than the sag of LGJ-400/35.
Further, whether said method also comprises the sag judging alternative wire and to be less than at a set temperature or suitable with former wire, is retain this alternative wire, otherwise rejects this alternative wire.
For analyzing the wire participated in than choosing further, the 4 kinds of wires require satisfied transformation and the expense of assorted golden tool have carried out preresearch estimates, and contrast situation is as follows:
Table 4 is participated in the election of Conductor's Economic index contrast table
From above comparative result: adopt aluminium Baogang core heat-resisting molded line JNRLH60X/LB14-350/35 specific investment cost minimum, adopt invar wire specific investment cost the highest.
Meanwhile, also preresearch estimates is carried out to the annual cost of 4 kinds of wires that satisfied transformation requires, compared and find that employing aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire annual cost is minimum.
Further, said method also comprises the annual cost of more satisfactory alternative wire, selects new wire according to useful life and annual cost.
Therefore, increase-volume is changed to steel reinforced aluminium conductor LGJ-400/35, recommend to adopt aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35.
Further, above-mentioned former wire is LGJ-400/35 steel reinforced aluminium conductor, and the new wire of selection is aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35.
For carrying out com-parison and analysis to steel reinforced aluminium conductor LGJ-400/35 and aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35 further, two kinds of wires are carried out to the comparative analysis of lightning protection, windage yaw aspect,
1) the sag characteristic comparative analysis of delivery limits capacity
Note: LGJ-400/35 is ambient temperature 40 DEG C, the sag in conductor temperature 70 DEG C of situations; JNRLH60X/LB14-350/35 is ambient temperature 40 DEG C, the sag in conductor temperature 113 DEG C of situations.
2) the sag characteristic comparative analysis of thunder and lightning operating mode
3) the angle of wind deflection comparative analysis of strong wind operating mode
Under strong wind operating mode, aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35 is 42.3 ° (arc-tangent value of high temperature load/large wind load), and the windage yaw angle being less than steel reinforced aluminium conductor LGJ-400/35 is 43 ° (arc-tangent value of high temperature load/large wind load).
From above relatively, aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35 meets the requirement of the sag of delivery limits capacity, lightning protection properties and electric clearance.
Preferably, equidistantly stockbridge damper is arranged on each sub-conductor.Hammer for preventing conductor from vibration model is FFH2428Y.Span no longer can adopt vibration protection at below 500m, when span is greater than 500m, each sub-conductor just installs stockbridge damper.When installing stockbridge damper, adopt and equidistantly install, mounting distance is started at from the center of suspension clamp or the tail end of strain clamp.The life-span that stockbridge damper makes to improve wire is installed, and adopts such mounting means to decrease the quantity of stockbridge damper, reduce cost.
Preferably, arrange multiple conductor spacer between sub-conductor, when span is less than 1000m, maximum average span gets 66m, and when span is greater than 1000m, maximum average span gets 55m.Conductor spacer adopts Unequal distance to install.Unequal distance installation interval rod prevents the vibration of different frequency.Further, above-mentioned Unequal distance refers to that time span is reduced to hitch point direction gradually by span central authorities (i.e. point of bisection between span), and asymmetric.Conductor spacer mounting distance obtains by actual wire length measuring.All from wire cross-arm center, (cross-arm is used to installing insulating and gold utensil to end time span (i.e. the distance of bundle conductor conductor spacer and wire clamp), with support conductors, lightning conducter, and make it to keep certain safe distance by regulation, the cross-arm center i.e. center of this distance) rise and measure, and require as far as possible accurately.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a 500kV transmission line heat-resisting wire capacity-increasing transformation method, it is specially the wire changing the old circuit of 500kV on the basis of original shaft tower, it specifically comprises the following steps: the wire according to original circuit, selects to possess compatibilization ability and can the wire of electric current of transmission line requirement; Weight and the former wire of new wire are close; The sag of new wire when transmitting rated current is not more than the sag that former wire allows; New wire maximum working tension is not more than former wire; New wire can bear long-time running in 30 years; New wire and assorted golden tool are convenient to install.
2. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 1, is characterized in that described new wire is selected from aluminium Baogang core heat-resisting aluminium alloy twisted wire, the shaping aluminium stranded conductor of aluminium Baogang core heat-resisting aluminium alloy, aluminium bag invar steel core heat-resisting aluminium alloy twisted wire, clearance type extra-heavy steel core heat-resisting aluminium alloy twisted wire, Heatproof aluminum-alloy stranded wire of carbon fiber composite core, extra-heavy steel reinforced soft aluminum strand or middle strength aluminium alloy wire.
3. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 2, it is characterized in that described method also comprises and judge whether alternative wire maximum carrying capacity at a set temperature meets the requirement of the highest transmission capacity of the power transformation station equipment of power transformation more after exchange device, thus reject undesirable alternative wire.
4. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 3, is characterized in that described method also comprises the specified stretching resistance judging alternative wire, thus rejects the alternative wire that specified stretching resistance is less than former wire.
5. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 4, it is characterized in that described method also comprises the requirement judging to carry 4000A electric current under can alternative wire meet limiting case, retain this alternative wire, otherwise, reject this alternative wire.
6. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 5, it is characterized in that described method also comprises the sag judging alternative wire and whether is less than former wire at a set temperature, be retain this alternative wire, otherwise reject this alternative wire.
7. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 6, is characterized in that described method also comprises the annual cost of more satisfactory alternative wire, selects new wire according to useful life and annual cost.
8. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 7, it is characterized in that described former wire is LGJ-400/35 steel reinforced aluminium conductor, the new wire of selection is aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35.
9. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 8, is characterized in that described LGJ-400/35 steel reinforced aluminium conductor is quadripartion.
10. 500kV transmission line heat-resisting wire capacity-increasing transformation method as claimed in claim 9, is characterized in that described aluminium bag steel-cored shaped heat-resisting aluminium alloy twisted wire JNRLH60X/LB14-350/35 comprises 24 aluminum steels and 7 steel wires.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109190931A (en) * | 2018-08-14 | 2019-01-11 | 北京道亨时代科技有限公司 | A method of the hard wire jumper iterative calculation based on three dimensional space coordinate |
| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109190931A (en) * | 2018-08-14 | 2019-01-11 | 北京道亨时代科技有限公司 | A method of the hard wire jumper iterative calculation based on three dimensional space coordinate |
| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
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