CN103078313B - Method for inhibiting induction voltage and current of 750kV parallel single-line construction line - Google Patents
Method for inhibiting induction voltage and current of 750kV parallel single-line construction line Download PDFInfo
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Abstract
The invention relates to a method for inhibiting an induction voltage and an induction current of a 750kV parallel single-line construction line. Two large-distance parallel and single-line construction 750kV alternating current transmission lines are coupled on an off-the-line line to generate a higher induction voltage and a higher induction current to ensure that the problem of difficult equipment selection caused by exceeding the turning on or off capacity of the existing 750kV earthing switch is solved. The invention provides a transposition and phase sequence arrangement mode to ensure that levels of the induction voltage and the induction current applying the measure are remarkably reduced and are lower than the requirement on technical parameters of the existing equipment, and thus the equipment selection problem is solved.
Description
Technical field
The present invention relates to extra-high voltage transmission field, be specifically related to a kind of 750kV of suppression and walk abreast the method for single time construction of line inductive voltage and current.
Background technology
Electrical couplings effect between (1) twice transmission line of alternation current
For a three phase current feeder road, the existence due to alternate mutual capacitance, mutual inductance makes to there is electrical couplings effect between three-phase conducting wire.And for the transmission line of alternation current of two parallel layings, between two return wires, also there is mutual capacitance, mutual inductance.
Describe capacitive coupling relation between two loop line roads in detail for simplification both-end, a double back transmission system below, see Fig. 1.Be introduced for the second loop line A phase in figure, due to the coupled relation of mutual inductance and mutual capacitance similar, therefore repeat no more.
As shown in Figure 1, E
iA, E
iB, E
iC, U
iA, U
iB, U
iCrepresent the first loop line sending end, receiving end three equal value power supply respectively, E
iIA, E
iIB, E
iIC, U
iIA, U
iIB, U
iICrepresent the second loop line sending end, receiving end three equal value power supply respectively; L
iA, L
iB, L
iCrepresent A, B, C three-phase of the first loop line respectively, L
iIA, L
iIB, L
iICrepresent A, B, C three-phase of the second loop line respectively; C
iIA-0represent the direct-to-ground capacitance of the second loop line A phase; C
iIA-IIB, C
iIA-IICrepresent the alternate mutual capacitance of the second loop line A phase and this loop line B phase, C phase respectively; C
iIA-IA, C
iIA-IB, C
iIA-ICrepresent mutual capacitance between the loop between the second loop line A phase and first loop line A, B, C three-phase respectively; X
l, X '
lrepresent high-voltage shunt reactor and the neutral reactor thereof of the second loop line respectively; D
lI, D
lIIrepresent the line-breaker of first, second loop line respectively, wherein the first loop line both sides line-breaker is in co-bit, and this loop line road is in bringing normally into operation state, and the second loop line both sides line-breaker is in a point position, and this loop line road is in shut down condition.
Inductive voltage and current between (2) twice transmission line of alternation currents
For the transmission line of electricity of two parallel erections, due to the coupling of mutual capacitance between loop, mutual inductance, under making a line outage, another time bringing normally into operation condition, on stoppage in transit circuit, coupling produces induced voltage and the induced-current of certain level.There are three kinds of different ground states in stoppage in transit circuit, under different conditions, the component played a major role in induced voltage, induced-current is also different, and Fig. 2-Fig. 4 gives the ground state schematic diagram of three kinds of stoppage in transit circuits.ES in figure
iIrepresent the earthed switch on the second loop line road.Stoppage in transit circuit three kinds of ground states specifically describe and are:
(a) stoppage in transit circuit two-terminal-grounding switch opens: as shown in Figure 2, under this state, the induced voltage that stoppage in transit circuit produces is mainly due to the electrostatic induction voltage component of mutual capacitance coupling generation;
B () stoppage in transit circuit one end earthed switch closes: as shown in Figure 3, under this state, the induced voltage that stoppage in transit circuit produces, mainly due to the electromagnetic induction voltage component that mutual inductance coupling produces, flows through the induced-current of closed earthed switch mainly due to the static induced current component of mutual capacitance coupling generation;
C () stoppage in transit circuit two-terminal-grounding switch closes: as shown in Figure 4, under this state, and the induced-current that stoppage in transit circuit produces is mainly due to the em induced current component of mutual inductance coupling generation.
Fig. 1 is simplified to Fig. 5 further below, under a stoppage in transit circuit two-terminal-grounding switch open condition to be described, the situation of the induced voltage that stoppage in transit circuit one phase produces.Only illustrate for the A phase in two loop line roads in figure, and ignore the small reactor on neutral point of high resistance, depending on high resistance neutral-point solid ground.
X in Fig. 5
and Arepresent the impedance after stoppage in transit circuit A relatively electric capacity and high resistance parallel connection, X
string Arepresent and backhaul impedance (capacitive reactance) corresponding to mutual capacitance between row line A phase with stoppage in transit circuit A phase, U with another
g-IIAArepresent the electrostatic induction voltage produced in stoppage in transit circuit A phase due to the coupling of A phase mutual capacitance between two loops.Following relational expression can be obtained according to Fig. 5:
U
g-IIAA=E
iAx
and A/ (X
string A+ X
and A) (formula 1);
X
string A=1/j ω C
iIA-IA(formula 2);
X
and A=X
l// (1/j ω C
iIA-0) (formula 3);
In general, when circuit being installed parallel high voltage reactor, its high resistance compensativity is less than 100%(undercompensation), i.e. high resistance lagging reactive power Q
lbe less than the capacitive charge power Q of circuit
c.The idle Q of perception of high voltage reactor
l=U
2/ X
l, the capacitive charge power Q of circuit
c=U
2/ (1/j ω C
iIA-0), by Q
l<Q
cx can be obtained
labsolute value be greater than (1/j ω C
iIA-0) absolute value, namely | X
l| >| (1/j ω C
iIA-0) |.Again by formula 3, known X
and Afor capacitive reactance, with X
string Acharacter is identical.On this basis, the mutual capacitance C when between two loops
iIA-IAmore hour, then the capacitive reactance X of its equivalence
string Alarger, by the known electrostatic induction voltage U produced on stoppage in transit circuit of formula 1
g-IIAwill be less.
(3) transposition form is on the impact of transmission line of alternation current inductive voltage and current
More hour, the mutual capacitance between loop is larger for distance between two loop line roads, then derive known according to above, the electrostatic induction voltage produced on stoppage in transit circuit during a loop line stoppage in transit is also larger.For twice 750kV transmission line of alternation currents, when adopting parallel lines on same tower mode, the three-phase conducting wire on two loop line roads is all taked to be arranged vertically, and between loop, the horizontal range of wire is generally 28 ~ 35m; And when adopting single time erection, two circuit parallel arranged modes, the three-phase conducting wire of every loop line is all taked horizontally disposed, between two loop lines, the centre distance of shaft tower is generally 60 ~ 100m, two wherein nearest phase conductor horizontal ranges are 25 ~ 60m, between all the other wires, horizontal range is all at more than 45m, is greater than the horizontal range of joint use, therefore Comparatively speaking, induced voltage and the induced-current of joint use are higher, and problem is more outstanding.
Similar with A shown in Fig. 5, B phase, the C phase mutual capacitance C through between loop respectively backhauling row line
iIA-IB, C
iIA-ICalso another time stoppage in transit circuit A is coupled generation induced voltage.Then one backhaul row line A, B, C three-phase be coupled in another time stoppage in transit circuit A phase produce electrostatic induction voltage
available formula below represents:
By formula 1 ~ 2, can obtain:
formula (5)
For long distance line, if take completely desirable transposition form as shown in Figure 7, the direct-to-ground capacitance on every loop line road is identical, and the mutual capacitance between two loop line roads is identical, i.e. X
string A=X
string B=X
string C, X
and A=X
and B=X
and C, then formula 5 can be reduced to formula 6:
formula (6)
For three phase current feeder road, due to
therefore should be 0 by the known induced voltage produced that is coupled on the stoppage in transit circuit of ideal transposition of formula 6.But in Practical Project, owing to restricting by factors such as the path of passway for transmitting electricity, landform and construction costs, make to accomplish completely desirable transposition, as shown in Figure 6, therefore generally adopt the transposition form of approaches uniformity, complete alternation more, be called conventional transposition form.Under this condition, stoppage in transit circuit will produce the induced voltage of certain amplitude.Induced-current and induced voltage problem also similar.Transposition and the phase sequence arrangement of two loop line road 6 phase conductors have considerable influence to induced voltage, induced-current.
For certain 750kV single time construction of line that walks abreast, the technical scheme that the present invention is the most close is described below.Conductor transposition and phase sequence arrangement are as shown in Figure 8.
The transposition form that technical scheme shown in Fig. 8 can be described as two loop line roads is identical with phase sequence arrangement, be approximate 2 complete alternations transposition, with phase sequence arrangement, the program is the scheme that two parallel single time construction of line routines are taked, the transposition number on two loop line roads adds up to 12 times, needs 12 base transposition towers.
For twice length be 330km, overhead line structures centre distance is that the 750kV of 60m walks abreast the single time construction of line, when adopting the transposition shown in Fig. 8 and phase sequence arrangement, stop transport at a loop line, another is under to backhaul row line transmission power be 5205MW condition, adopt EMTP simulation software to calculate the inductive voltage and current produced on stoppage in transit circuit as shown in table 1.
Certain 750kV of table 1 walks abreast the inductive voltage and current (employing prior art) of the single time construction of line
The maximum induced voltage of three-phase wherein under stoppage in transit circuit two-terminal-grounding switch open condition reaches 130.0kV(electrostatic induction voltage), exceed enterprise's mark Q/GDW 106-2003 of the State Grid Corporation of China " 750kV system high-voltage alternating current isolating switch technical specification " and current device fabrication producer available 750kV earthed switch folding ability shown in table 2, make equipment cannot type selecting.All the other static induced currents, electromagnetic induction voltage, em induced current are then all in existing standard and device fabrication limit of power.
Reflect thus, if adopt prior art, make line-to-ground switch cannot type selecting, and cause engineering design plan (EDP) not meet the demands.
The specified inductive voltage and current technical requirement of the 750kV line-to-ground switch of mark and equipment manufacturer looked forward to by table 2
Be coupled on a stoppage in transit circuit the higher inductive voltage and current of generation for two 750kV transmission line of alternation currents that are remote, parallel, single time erection, make to exceed existing 750kV earthed switch folding ability and the problem that causes lectotype selection difficulty.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of 750kV of suppression to walk abreast the method for single time construction of line inductive voltage and current, the present invention adopts transposition and phase sequence arrangement, inductive voltage and current level after adopting this measure is obviously reduced, lower than the requirement of existing equipment technical parameter, solve lectotype selection problem.
The object of the invention is to adopt following technical proposals to realize:
A kind of 750kV of suppression provided by the invention walks abreast the method for single time construction of line inductive voltage and current, and its improvements are, described method adopts the transposition between transposition section and phase sequence to arrange and realizes; Described method comprises the steps:
(1) described first single back line and the second single back line are divided into two transposition sections respectively;
(2) the single transposition section of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections;
(3) the single transposition section of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections;
(4) be set as identical separate by two 1/6 transposition sections in the single transposition section of the first single back line, it is separate that two other 1/3 transposition section is set as two differences respectively;
(5) two 1/3 transposition sections in the single transposition section of the second single back line are set as two differences respectively separate;
(6) by the separate reversed order of 2 1/3 transposition sections of formed objects transposition section in 2 1/3 transposition sections of formed objects transposition section in the first single back line and the second single back line, and residue 1/3 transposition section of second single loop line is made to be set as identical separate with two 1/6 little transposition sections of first single loop line.
Wherein, in described step (1), described single back line total length 330km, then each transposition segment length 165km.
Wherein, in described step (2), the single transposition section 165km of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections.
Wherein, described 1/6,1/3,1/3 and 1/6 corresponding respectively line length is 27.5km, 55km, 55km and 27.5km.
Wherein, in described step (3), the single transposition section 165km of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections.
Wherein, the line length of described 1/3,1/3 and 1/3 correspondence is 55km.
Wherein, the transposition number on described two loop line roads adds up to 12 times, adopts 12 base transposition towers to realize.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1, the invention solves the circuit for two parallel arranged, single time erection, when two loop line road spacings are nearer, especially when circuit is longer, 2 complete alternations taking single back line routine to take replace, with under phase sequence arrangement condition, stoppage in transit circuit produce inductive voltage and current level higher, even may exceed existing standard and device fabrication ability, cause the problem of lectotype selection difficulty;
2, the invention solves and be a kind ofly applicable to two parallel arranged, the transposition of the single time construction of line and phase sequence method for arranging, two loop line roads are similar to and achieve 4 transpositions entirely, make the mutual capacitance of each phase between two loops, mutual inductance parameter more balanced, under the transposition taking the present invention to propose and phase sequence arrangement condition, compared with prior art, significantly can be reduced in the inductive voltage and current level that a stoppage in transit circuit produces, make, lower than existing equipment manufacturing capacity, to solve lectotype selection problem.
3,750kV that is indivedual remote, that install controlled high resistance is walked abreast the single time construction of line, during when taking conventional twice complete alternation transposition, with phase sequence arrangement, stoppage in transit circuit produce inductive voltage and current level higher, especially electrostatic coupling induced voltage, for certain engineering, 130.0kV can be reached, exceed the 100kV requirement of 750kV line-to-ground switch reliable folding electrostatic induction voltage 50kV that existing standard specifies and equipment manufacturer, suitable earthed switch equipment cannot have been selected.
Adopt suppression 750kV provided by the invention walk abreast the method for the single time construction of line inductive voltage and current time, induced voltage that a stoppage in transit circuit produces and induced-current level are obviously reduced, wherein maximum electrostatic inductive coupling voltage is down to 68.2kV by the 130.0kV under prior art, the 100kV technical requirement of existing equipment producer can be met, all the other static induced currents, electromagnetic induction voltage, em induced current level is also all in existing standard and device fabrication limit of power, and there is certain nargin, solve the equipment existed in engineering design and be difficult to selection issue, meet engineer applied requirement.
Accompanying drawing explanation
Fig. 1 is that the capacitive coupling coupled relation of double-circuit line simplifies equivalent circuit diagram;
Fig. 2 is stoppage in transit circuit two-terminal-grounding switch opens schematic diagram;
Fig. 3 is that stoppage in transit circuit one end earthed switch closes schematic diagram;
Fig. 4 is that stoppage in transit circuit two-terminal-grounding switch closes schematic diagram;
Fig. 5 is the induced voltage simplified electrical circuit diagram produced on a phase stoppage in transit circuit;
Fig. 6 is even, the complete alternation transposition form schematic diagram of two parallel laying single back line routines;
Fig. 7 is the desirable transposition form schematic diagram of two parallel laying single back lines;
Fig. 8 is and the most akin Conductor transposition of the present invention and phase sequence arrangement figure;
Fig. 9 is that 750kV provided by the invention walks abreast the transposition of the single time construction of line and phase sequence arrangement figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Suppression 750kV provided by the invention walks abreast the system of single time construction of line inductive voltage and current, comprises two back transmission lines, electric power line pole tower and Liang Ge transformer station; Described Liang Ge transformer station is connected by two back transmission lines.
Wherein, high voltage reactor is equiped with at two loop line Lu Shangjun; Described two loop line roads are that 750kV walks abreast the single time construction of line; Be respectively the first single back line and the second single back line; Described first single back line and the second single back line total length are 330km; Distance between two back transmission line shaft tower centers is 60m.
Suppression 750kV provided by the invention walks abreast the method for single time construction of line inductive voltage and current, is realized by the transposition and phase sequence arrangement arranging two back transmission lines; Described method comprises the steps:
(1) described first single back line and the second single back line are divided into two transposition sections respectively; Single back line total length 330km, then each transposition segment length 165km.
(2) the single transposition section of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections; , the single transposition section 165km of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections.
Wherein, 1/6,1/3,1/3 and 1/6 corresponding respectively line length is 27.5km, 55km, 55km and 27.5km.
(3) the single transposition section of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections; The single transposition section 165km of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections.
Wherein, the line length of 1/3,1/3 and 1/3 correspondence is 55km.
(4) be set as identical separate by two 1/6 transposition sections in the single transposition section of the first single back line, it is separate that two other 1/3 transposition section is set as two differences respectively;
(5) two 1/3 transposition sections in the single transposition section of the second single back line are set as two differences respectively separate;
(6) by the separate reversed order of 2 1/3 transposition sections of formed objects transposition section in 2 1/3 transposition sections of formed objects transposition section in the first single back line and the second single back line, and residue 1/3 transposition section of second single loop line is made to be set as identical separate with two 1/6 little transposition sections of first single loop line.
Wherein, the transposition number on two loop line roads adds up to 12 times, adopts 12 base transposition towers to realize.
Adopt suppression 750kV provided by the invention to walk abreast the method for single time construction of line inductive voltage and current, can realize:
The transposition number on I, two loop line roads is different, and a loop line replaces 5 times, and another loop line replaces 7 times, and the total transposition number on two loop line roads is 12 times, and required mixture number is 12 bases, identical with the prior art shown in Fig. 8;
II, viewed from twice line phase-sequence detection corresponding relations, present invention achieves 4 full transpositions, more than twice transposition of prior art, the increase of transposition makes mutual capacitance difference between the loop on two loop line roads less, between loop, the balance of parameter is better, therefore when a loop line is stopped transport, under another backhauls the row line voltage condition identical with transmission power, stoppage in transit circuit is coupled the inductive voltage and current level produced will be lower.
The induced voltage that table 3 calculates under listing the technical scheme condition taking the present invention to propose and induced-current result, except Conductor transposition and phase sequence arrangement, all the other design conditions are identical with table 2.
Certain 750kV of table 3 walks abreast the inductive voltage and current (employing technical solution of the present invention) of the single time construction of line
From result in table 3, take the present invention to propose (Fig. 9) transposition and phase sequence arrangement condition under, the maximum electrostatic induced voltage that a stoppage in transit circuit produces is 68.2kV, be starkly lower than 130.0kV when adopting prior art (Fig. 8), all the other static induced currents, electromagnetic induction voltage, em induced current are also all starkly lower than the result under Fig. 8 condition.Further, inductive voltage and current level, all lower than the technical conditions of current equipment manufacturer, meets lectotype selection requirement.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. suppress 750kV to walk abreast the method for single time construction of line inductive voltage and current, it is characterized in that, described method adopts the transposition between transposition section and phase sequence to arrange and realizes; Described method comprises the steps:
(1) described first single back line and the second single back line are divided into two transposition sections respectively;
(2) the single transposition section of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections;
(3) the single transposition section of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections;
(4) be set as identical separate by two 1/6 transposition sections in the single transposition section of the first single back line, it is separate that two other 1/3 transposition section is set as two differences respectively;
(5) three 1/3 transposition sections in the single transposition section of the second single back line are set as three differences respectively separate;
(6) by the separate reversed order of 2 1/3 transposition sections of formed objects transposition section in 2 1/3 transposition sections of formed objects transposition section in the first single back line single transposition section and another single transposition section, and according to same method, by the separate reversed order of 2 1/3 transposition sections of formed objects transposition section in 2 1/3 transposition sections of formed objects transposition section in the second single back line single transposition section and another single transposition section, and make residue 1/3 transposition section in the single transposition section of the second single back line be set as identical separate with two 1/6 little transposition sections in the corresponding single transposition section of the first single back line.
2. the as claimed in claim 1 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, it is characterized in that, in described step (1), and described single back line total length 330km, then each transposition segment length 165km.
3. the as claimed in claim 1 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, it is characterized in that, in described step (2), the single transposition section 165km of the first single back line is divided into 1/6,1/3,1/3 and 1/6 and amounts to 4 transposition sections.
4. the as claimed in claim 3 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, it is characterized in that, described 1/6,1/3,1/3 and 1/6 corresponding respectively line length is 27.5km, 55km, 55km and 27.5km.
5. the as claimed in claim 1 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, it is characterized in that, in described step (3), the single transposition section 165km of the second single back line is divided into 1/3,1/3 and 1/3 and amounts to 3 transposition sections.
6. the as claimed in claim 5 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, and it is characterized in that, the line length of described 1/3,1/3 and 1/3 correspondence is 55km.
7. the as claimed in claim 5 750kV that suppresses walks abreast the method for single time construction of line inductive voltage and current, and it is characterized in that, the transposition number on described two loop line roads adds up to 12 times, adopts 12 base transposition towers to realize.
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| CN103986163B (en) * | 2014-05-29 | 2016-08-10 | 国家电网公司 | The suppression system of faradic current voltage and method between a kind of multiple-circuit on same tower |
| CN106383259A (en) * | 2016-09-06 | 2017-02-08 | 广东电网有限责任公司江门供电局 | Induced current and inducted voltage measurement method of multi-circuit transmission lines on same tower |
| CN108152721B (en) * | 2017-10-26 | 2022-05-31 | 中国电力科学研究院有限公司 | Method and device for determining parameters of high-speed grounding switch along half-wavelength power transmission line |
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| 500kV同塔双回线路感应电压和电流的仿真与研究;傅中;《第十五届( 2 0 0 7 年) 华东六省一市电机工程( 电力) 学会输配电技术研讨会论文集》;20071231;第161－163页 * |
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