CN207045163U - A kind of electric railway external electrical network powered construction - Google Patents

Abstract

The utility model provides a kind of electric railway external electrical network powered construction, external electrical network includes transformer station and power transmission line, A types transformer station powers through power transmission line to Type B transformer station, c-type transformer station and traction substation, Type B transformer station powers through power transmission line to c-type transformer station and traction substation, and c-type transformer station powers through power transmission line to traction substation；Definition traction substation is leaf, A types transformer station is root, between Type B, c-type transformer station be node, A, B, c-type transformer station and traction substation are connected into tree-structured supply network from voltage levels to low-voltage-grade through power transmission line, as long as retrospect can find same node or root to two adjacent traction substations (leaf) upwards respectively, can is connected subregion therebetween, implements insertion power supply, and will not produce euqalizing current；Wherein power transmission line has two-way, and progress capacity is standby, and does not influence traction power supply because of any power transmission line, transformer station's sectionalized busbar maintenance or failure.

Description

A kind of electric railway external electrical network powered construction

Technical field

The utility model belongs to electrified railway power supply technical field, and more particularly to external electrical network is to electric railway traction The power supply mode and the method for operation of electric substation.

Background technology

In existing electric railway, to make single-phase traction load be evenly distributed as far as possible in three-phase electrical power system, lead Draw net and employ rotation phase sequence, the scheme of split-phase switched-mode power supply.Split at split-phase subregion with insulating device or insulated overlap Adjacent service area, form electric split-phase, also referred to as split-phase.Generally between traction substation exit and two neighboring traction substation Subregion residing electric split-phase is set.Electric split-phase is the most weak link of Traction networks and power supply bottleneck, and electric train leads to phase splitting Most easily trigger accident, threaten power supply and traffic safety.

Cancel electric split-phase and be divided to two kinds of situations：One is using cophase supply technology, to cancel traction substation exit Electric split-phase, its key are effective improvement negative-sequence currents, non-equilibrium among three phase voltages is reached Standard；The second is in two phases Connected between adjacent traction substation, implement two-side feeding, to cancel the electric split-phase residing for subregion, now, formed under normal circumstances Traction networks and the parallel way of power system, its key are to reduce under this parallel way the caused euqalizing current in Traction networks (shunting, penetration), reaches allowed degree.

Single side feeding is used in view of the traction substation of China's electric railway, there is no and implement bilateral connection power supply Precedent, standard of the power network also without euqalizing current tolerance level, then timely and effective method is exactly to utilize power system operating mode, is ground Study carefully can not only cancel subregion electric split-phase but also do not produce the power supply plan of euqalizing current and its influence.Applicant's application《It is a kind of Electric railway subregion connects powered construction (application number 201710157014.8)》Can preferably solve the electric split-phase of subregion institute With the unsolved technical problem, while improve reliability at present such as euqalizing current, and cost is low, good economy performance.But the party There is also open defect for case：

(1) there was only two voltage class, the program realize electric railway subregion connect, the distance of no phase separation power supply by Restricted to very big.27.5kV and 110kV, or 27.5kV and 220kV (or 330kV, similarly hereinafter), traction substation only allow to access The 110kV sectionalized busbars of A types transformer station or the 220kV sectionalized busbars of Type B transformer station, as this application is in its " background technology " It is described：" fed distance of 110kV power transmission lines is usually no more than 150km, and the fed distance of 220kV power transmission lines is usually no more than 300km ", this application are further write in " embodiment "：" consider power grid transmission line ability to transmit electricity, transmission of electricity away from From and its economy, the power supply mode be most suitable for as shorter circuits such as administrative region of a city railway, single phase ac standard subways ".

(2) method of operation without euqalizing current needs to switch between Liang Ge transformer stations, and power scheduling and back brake operation are stranded It is difficult.

Technical problems to be solved are now：Realize the no phase separation of the longer distance of electric railway and the confession without euqalizing current Electricity, and need not all switch when any power transmission line, transformer station's sectionalized busbar failure or maintenance between different substation, simultaneously Reducing the construction costs, ensure power supply reliability.

Utility model content

The purpose of this utility model is to provide a kind of electric railway external electrical network powered construction, and it can be efficiently solved more In the electric railway of long range by each subregion in switch closure realize insertion power supply and do not produce the skill of euqalizing current Art problem.

The purpose of this utility model is achieved through the following technical solutions：A kind of electric railway external electrical network power supply Construction, external electrical network includes transformer station and power transmission line, be divided into from high to low according to voltage class A types transformer station, Type B transformer station and C-type transformer station；A types transformer station feeds out 500kV voltage gradations, and Type B transformer station feeds out 220kV or 330kV voltage gradations, and c-type becomes Power station feeds out 110kV voltage gradations；A types transformer station powers through power transmission line to Type B transformer station, c-type transformer station and traction substation, Type B transformer station powers through power transmission line to c-type transformer station and traction substation, and c-type transformer station supplies through power transmission line to traction substation Electricity；Traction substation is powered to contact net, and contact net is to train power supply；Set along electric railway between adjacent traction substation Subregion institute is put, switch, switch connection or segmentation both sides contact net are set in subregion institute；The 500kV sectionalized busbars point of A types transformer station Not directly to nearest m GeBXing transformer stations, n GeCXing transformer stations and p traction substation power supply, wherein A types transformer station is same The different segmentations of two of sectionalized busbar are led through two-way power transmission line to one of Type B transformer station or a GeCXing transformer stations or one Draw electric substation's power supply, m, n, p are 0 or positive integer, and at least, two non-zero by m, n, p；220kV or the 330kV segmentation of Type B transformer station Bus is female directly to nearest q GeCXing transformer stations and r traction substation power supply, the wherein same segmentation of Type B transformer station respectively The different segmentations of two of line are just whole to one of c-type transformer station or a traction substation power supply, q, r through two-way power transmission line Number；The 110kV sectionalized busbars of c-type transformer station are powered directly to t nearest traction substation respectively, and wherein c-type transformer station is same The different segmentations of two of one sectionalized busbar are powered through two-way power transmission line to one of traction substation, t >=2, are positive integer；Electricity Gasify Along Railway traction substation between subregion in switch closure.

Specially the 500kV sectionalized busbars of A types transformer station become directly to nearest Liang Ge Type Bs transformer station, a c-type respectively Power station and a traction substation power supply, the wherein different segmentations of the first of the same sectionalized busbar of A types transformer station group two are through first Group two-way power transmission line is directly powered to one of Type B transformer station, second group of two difference of the same sectionalized busbar of A types transformer station Segmentation is directly powered through second group of two-way power transmission line to another Type B transformer station, the 3rd group of the same sectionalized busbar of A types transformer station Two different segmentations are powered through the 3rd group of two-way power transmission line directly to a GeCXing transformer stations, the same sectionalized busbar of A types transformer station 4th group two different segmentations are through the 4th group of two-way power transmission line directly to the 5th traction substation power supply from left to right；From a left side extremely Two different segmentations of the same sectionalized busbar of 220kV or 330kV of right first GeBXing transformer stations are through two-way power transmission line directly to certainly The first GeCXing of left-to-right transformer stations power, from left to right the same sectionalized busbars of 220kV or 330kV of the second GeBXing transformer stations First group two different segmentations are directly powered through two-way power transmission line to the 3rd GeCXing transformer stations from left to right, and second group two are not Directly powered to the 6th traction substation from left to right through two-way power transmission line with segmentation；First GeCXing transformer stations from left to right The different segmentations of same sectionalized busbars first group of 110kV two drawn through first group of two-way power transmission line to first from left to right Electric substation powers, and second group two different segmentations supply through second group of two-way power transmission line to second traction substation from left to right Electricity；Along electric railway between traction substation subregion in switch closure.

A types transformer station, Type B transformer station, the Traction networks of the power transmission line of c-type transformer station and traction substation relate separately to Tetra- 500kV, 220kV (or 330kV), 110kV and 27.5kV voltage class.

Electric railway belongs to first order load, and its traction substation requires that power network is reliably powered to it.In existing traction Two main transformers, a master one install under mode in electric substation, then requirement inputs two-way independence inlet wire, this two-way independence inlet wire from power network It can come from different segmentations or Liang Ge power plant, the Liang Ge transformer stations of the same sectionalized busbar of same transformer station.

Different segmentations of the two-way power transmission line of the input traction substation from the same sectionalized busbar of same transformer station, One master one is standby, and standby each other, any method of operation does not produce euqalizing current.

Operation principle of the present utility model is：The voltage class of power transmission line is higher, ability to transmit electricity is stronger, transmission distance more It is long, but construction cost is higher, and opposite voltage lower grade, and ability to transmit electricity is weaker, and transmission distance is shorter, but popularity is higher, Closer to user, also more more it is readily available, construction cost is also lower, can take into account power supply capacity by power network stepped configuration and build It is set as this two aspect.The traction substation for defining minimum voltage grade is leaf, and the A types transformer station of highest voltage level is root, it Between the Type B of voltage class, c-type transformer station be node, connected into through power transmission line from voltage levels to low-voltage-grade Tree-structured supply network.As long as two adjacent traction substations (leaf) respectively upwards retrospect can find same node or Person's root, it is possible to subregion therebetween is connected, implements insertion power supply, and euqalizing current will not be produced.For the sake of simplicity, with C Exemplified by type transformer station powers to traction substation：The c-type transformer station (node) of traction substation (leaf) power supply adjacent to two The voltage of the different segmentations of two of same sectionalized busbar is identical, i.e., pressure difference=0 between two segmentations, then, when the two lead When drawing the subregion between electric substation and connecting, the electricity for the branch road that 110kV power transmission lines, traction substation, contact net are formed is acted on Component=0 is pressed, is not produced if the no-load voltage ratio for setting two traction substations in the branch road is identical, between the branch road and sectionalized busbar point Stream, i.e., do not produce euqalizing current and penetration；A types transformer station and Type B transformer station and its tree-structured supply network of composition Power supply situation it is as the same.Meanwhile the method for operation of tree-structured is flexible, easily conversion.

Compared with prior art, the beneficial effects of the utility model are：

First, the utility model can cancel the electric split-phase of subregion institute on more than 1000km electrified circuit of growing up, and implement Insertion power supply, ensures power supply continuity, and do not produce euqalizing current.

2nd, the utility model will not influence to draw because of any power transmission line all the way, transformer station's sectionalized busbar maintenance or failure Power supply, the method for operation is flexible, and power supply reliability is high.

3rd, the utility model performance is good, and cost is low.

4th, the utility model is not only suitable for new line construction, is also applied for old line transformation.

Brief description of the drawings

The structural representation of the basic power supply mode of Fig. 1 the utility model embodiments.

The structural representation of one of the power supply mode of Fig. 2 the utility model embodiments.

Two structural representation of the power supply mode of Fig. 3 the utility model embodiments.

Three structural representation of the power supply mode of Fig. 4 the utility model embodiments.

Embodiment

The utility model will be further described with reference to the accompanying drawings and detailed description for embodiment.

External electrical network includes transformer station and power transmission line, is divided into A types transformer station, Type B power transformation from high to low according to voltage class Stand and c-type transformer station；A types transformer station feeds out 500kV voltage gradations, and Type B transformer station feeds out 220kV or 330kV voltage gradations, C-type transformer station feeds out 110kV voltage gradations；A types transformer station is through power transmission line to Type B transformer station, c-type transformer station and traction substation Power supply, Type B transformer station power through power transmission line to c-type transformer station and traction substation, and c-type transformer station gives traction power transformation through power transmission line Powered；Power transmission line has two-way, powers all the way, standby all the way, or two-way works, and it is standby to carry out capacity；Traction substation Powered to contact net, contact net is to train power supply；Subregion institute, subregion are set along electric railway between adjacent traction substation Switch, switch connection or segmentation both sides contact net are set in institute.

Fig. 1 shows, the structural representation of the basic power supply mode of the utility model embodiment：Outside a kind of electric railway Power network powered construction：The 500kV sectionalized busbars of A types transformer station 4 are respectively directly to nearest 3, C types of Liang Ge Type Bs transformer station Transformer station 2 and a traction substation 1 are powered, wherein the different segmentation warps of first group of 4 same sectionalized busbar of A types transformer station two First group of two-way power transmission line 7 is directly powered to one of Type B transformer station 3, second group of 4 same sectionalized busbar of A types transformer station Two different segmentations are directly powered through second group of two-way power transmission line 7 to another Type B transformer station 3, the 4 same segmentation of A types transformer station 3rd group two different segmentations of bus are powered through the 3rd group of two-way power transmission line 8 directly to a GeCXing transformer stations 2, A type power transformations The 4th group two different segmentations of 4 same sectionalized busbars of standing are led through the 4th group of two-way power transmission line 9 directly to the 5th from left to right Draw electric substation 1 to power；In figure, two of the same sectionalized busbar of 220kV or 330kV of the first GeBXing transformer stations 3 are not from left to right Powered with segmentation through two-way power transmission line 6 directly to the first GeCXing transformer stations 2 from left to right, from left to right the second GeBXing transformer stations First group two different segmentations of the 3 same sectionalized busbar of 220kV or 330kV are through two-way power transmission line 6 to the 3rd C from left to right Type transformer station 2 directly powers, and second group two different segmentations are through two-way power transmission line 10 to the 6th traction substation 1 from left to right Directly power；The different segmentations of the same sectionalized busbars first group of the 110kV of first GeCXing transformer stations 2 two from left to right are through first Group two-way power transmission line 5 is powered to first traction substation 1 from left to right, and second group two different segmentations are through second group of two-way Power transmission line 5 is powered to second traction substation 1 from left to right, similarly, the 110kV of second C types transformer station 2 from left to right Same sectionalized busbar is powered to the 3rd from left to right and the 4th traction substation 1 respectively, the 3rd c-type power transformation from left to right The 2 same sectionalized busbars of 110kV of standing are powered to the 7th and the 8th traction substation 1 from left to right respectively；Electric railway Along the line between traction substation subregion in switch 11 close, realize eight traction substations as depicted insertion supply Electricity.

In traction substation 1 from left to right, first traction substation is adjacent with second traction substation, upward respectively Trace, the first GeCXing transformer stations in c-type transformer station 2 from left to right are its node；Second traction substation and the 3rd Traction substation is adjacent, respectively retrospect upwards, and A types transformer station is its node (root)；3rd traction substation is led with the 4th It is adjacent to draw electric substation, respectively retrospect upwards, the second GeCXing transformer stations from left to right are its node；4th traction substation Adjacent with the 5th traction substation, retrospect upwards respectively, A types transformer station is its node (root)；5th traction substation with 6th traction substation is adjacent, respectively retrospect upwards, and A types transformer station is its node (root)；6th traction substation and Seven traction substations are adjacent, respectively retrospect upwards, and the second GeBXing transformer stations from left to right are its node；7th traction Electric substation is adjacent with the 8th traction substation, respectively retrospect upwards, and the 3rd GeCXing transformer stations from left to right are its node. It can be seen from utility model principle, between eight traction substations along electric railway subregion in switch closure, it is real Euqalizing current will not be produced by applying insertion power supply.

Generally traction substation does not allow the A types transformer station for being directly accessed the existing highest voltage level of country, only Type B, c-type transformer station can be accessed.

Fig. 2 shows, the structural representation of one of power supply mode of the utility model embodiment：From a left side in traction substation 1 To the right side, first traction substation is adjacent with second traction substation, respectively retrospect upwards, in c-type transformer station 2 from left to right The first GeCXing transformer stations be its node；Second traction substation is adjacent with the 3rd traction substation, chases after upwards respectively Trace back, the first GeBXing transformer stations in B types transformer station 3 from left to right are its node；3rd traction substation is led with the 4th It is adjacent to draw electric substation, the 4th traction substation is adjacent with the 5th traction substation, respectively retrospect upwards, in c-type transformer station 2 The second GeCXing transformer stations from left to right are the common joint of these three traction substations；5th traction substation and the 6th Individual traction substation is adjacent, respectively retrospect upwards, and A types transformer station 4 is its root；6th traction substation and the 7th traction become Electric institute is adjacent, respectively retrospect upwards, and the second GeBXing transformer stations in Type B transformer station 3 from left to right are its node；7th is led It is adjacent with the 8th traction substation to draw electric substation, respectively retrospect upwards, the 3rd c-type in c-type transformer station 2 from left to right becomes Power station is its node；It can be seen from utility model principle, along electric railway between traction substation subregion in switch 11 closures, implement insertion power supply, euqalizing current will not be produced.

Electric railway and power network are likely to occur A types when planning together, Type B, c-type transformer station connect into it is comparatively ideal tree-like The situation of construction.

Fig. 3 shows, two structural representation of the power supply mode of utility model embodiment：A kind of electric railway external electrical Net powered construction：The 110kV sectionalized busbars of c-type transformer station 2 are powered to the traction substation 1 along electric railway nearby, its The different segmentations of two of 2 same sectionalized busbar of ZhongCXing transformer stations are powered through two-way power transmission line 5 to a traction substation, c-type Two other difference segmentation of 2 same sectionalized busbar of transformer station is powered through other two-way power transmission line to another traction substation；B The 220kV sectionalized busbars of type transformer station 3 are powered to c-type transformer station 2, and c-type transformer station 2 powers to traction substation, wherein B types The different segmentations of two of 3 same sectionalized busbar of transformer station are powered through two-way power transmission line 6 to one of transformer station of c-type 2, and B types become Two other difference segmentation of 3 same sectionalized busbar of power station is powered through other two-way power transmission line to another c-type transformer station 2； A The different segmentations of two of 4 same sectionalized busbar of type transformer station are powered through two-way power transmission line 7 to one of Type B transformer station, A types Two other difference segmentation of the same sectionalized busbar of transformer station is powered through other two-way power transmission line to another Type B transformer station；Electricity Gasification Along Railway traction substation between subregion in switch 11 close.

In traction substation (1) from left to right, first traction substation is adjacent with second traction substation, respectively to Upper retrospect, the first GeCXing transformer stations in c-type transformer station 2 from left to right are its node；Second traction substation and the 3rd Traction substation is adjacent, respectively retrospect upwards, and the first GeBXing transformer stations in Type B transformer station 3 from left to right are its node；The Four traction substations are adjacent with the 5th traction substation, respectively retrospect upwards, and A types transformer station 4 is its root, and the rest may be inferred by analogy, It can be seen from utility model principle, along electric railway between traction substation subregion in switch 11 close, implement to pass through Logical power supply will not produce euqalizing current.

Electric railway only has access Type B, c-type transformer station sometimes, and connects into comparatively ideal tree-structured.

Fig. 4 is three structural representation of the power supply mode of utility model embodiment.A kind of electric railway external electrical network Powered construction：The 110kV sectionalized busbars of c-type transformer station 2 are to the traction substation power supply 1 along electric railway nearby, wherein C Two of 2 same sectionalized busbar of type transformer station are different, and segmentation is powered through two-way power transmission line 5 to a traction substation 1, c-type power transformation Stand same sectionalized busbar two other difference segmentation powered through other two-way power transmission line to another traction substation 1；Type B becomes The 220kV sectionalized busbars in power station 3 are powered to c-type transformer station 2, the wherein different segmentations of two of 3 same sectionalized busbar of Type B transformer station Powered through two-way power transmission line 6 to one of c-type transformer station, two other difference segmentation of the same sectionalized busbar of Type B transformer station Powered through other two-way power transmission line 6 to another c-type transformer station；Along electric railway between traction substation subregion in The closure of switch 11.Similarly understand, the program will not produce euqalizing current.

In order to reduce the number of fragments of the same sectionalized busbar of transformer station, the access difficulty of low-voltage-grade transformer substation is reduced, Can be drawn all the way from one of voltage levels transformer station sectionalized busbar segmentation, then through T connect mode be distributed to it is two or more low Voltage class transformer station or traction substation, but the relevance for connecing due to T mode power transmission line is strong, and reliability can also be affected.

The fed distance of 110kV power transmission lines is usually no more than 150km, and c-type transformer station 110kV power transmission lines extend defeated to both sides Scope is sent up to 300km；The fed distance of 220kV power transmission lines is usually no more than 300km, and Type B transformer station 220kV power transmission lines are to two Side extension conveying scope is up to 600km；The fed distance of 500kV power transmission lines is usually no more than 850km, A types transformer station 500kV Power transmission line extends conveying scope up to 1700km to both sides, if each You YigeBXing transformer stations in its both sides or the relay of c-type transformer station, Scope is then conveyed up to more than 2000km.This creates condition to cancelling the electric split-phase of subregion institute on electrified circuit of growing up.Such as： Certain high ferro total length 1318km, existing 27 traction substations, 53 split-phases, if same 500kV power networks are powered, then it can use Disappear whole split-phases, and effect is very notable.

In view of line voltage grade, the ability to transmit electricity of power transmission line, transmission distance and its economy, using voltage levels Tree-structured can to low-voltage-grade cancels subregion institute electricity point in the longer of more than 1000km on electrified circuit Phase, implement insertion power supply, ensure power supply continuity, and euqalizing current is not produced in power network, also not because of any power transmission line, power transformation Sectionalized busbar of standing overhaul or failure and influence traction power supply, method of operation conversion is flexible, reliable sexual satisfaction requirement.

Claims (2)

1. a kind of electric railway external electrical network powered construction, external electrical network includes transformer station and power transmission line, according to voltage class It is divided into A types transformer station, Type B transformer station and c-type transformer station from high to low；The 500kV sectionalized busbars difference of A types transformer station (4) is straight Connect and become to nearest Liang Ge Type Bs transformer station (3), a GeCXing transformer stations (2) and traction substation (1) power supply, wherein A types The first group two different segmentations of power station (4) same sectionalized busbar give one of Type B power transformation through first group of two-way power transmission line (7) Standing, (3) are direct to power, and the second group two different segmentations of A types transformer station (4) same sectionalized busbar are through second group of two-way power transmission line (7) directly powered to another Type B transformer station (3), the 3rd group two different segmentations of A types transformer station (4) same sectionalized busbar Powered through the 3rd group of two-way power transmission line (8) directly to a GeCXing transformer stations (2), the of A types transformer station (4) same sectionalized busbar Four groups two different segmentations are through the 4th group of two-way power transmission line (9) directly to the 5th traction substation (1) power supply from left to right；From The different segmentations of two of the same sectionalized busbar of 220kV or 330kV of the first GeBXing of left-to-right transformer stations (3) are through two-way power transmission line (6) directly to the first GeCXing transformer stations (2) from left to right power, from left to right the 220kV of the second GeBXing transformer stations (3) or First group two different segmentations of the same sectionalized busbars of 330kV are through two-way power transmission line (6) to the 3rd GeCXing transformer stations from left to right (2) directly power, second group two different segmentations are straight to the 6th traction substation (1) from left to right through two-way power transmission line (10) Connect power supply；The different segmentations of the same sectionalized busbars first group of 110kV of first GeCXing transformer stations (2) two from left to right are through first Group two-way power transmission line (5) is to first traction substation (1) power supply from left to right, and second group two different segmentations are through second group Two-way power transmission line (5) is to second traction substation (1) power supply from left to right.

A kind of 2. electric railway external electrical network powered construction according to claim 1, it is characterised in that：The traction becomes Between electric institute subregion in switch close.