CN113978321B - Bilateral through power supply sectional station and traction power supply system - Google Patents
Bilateral through power supply sectional station and traction power supply system Download PDFInfo
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- CN113978321B CN113978321B CN202111248635.XA CN202111248635A CN113978321B CN 113978321 B CN113978321 B CN 113978321B CN 202111248635 A CN202111248635 A CN 202111248635A CN 113978321 B CN113978321 B CN 113978321B
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- 230000002146 bilateral effect Effects 0.000 title claims abstract description 22
- 230000007935 neutral effect Effects 0.000 claims abstract description 81
- 230000003137 locomotive effect Effects 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims description 35
- 230000001174 ascending effect Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 7
- 230000005404 monopole Effects 0.000 claims description 5
- 238000005191 phase separation Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 230000011218 segmentation Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000005192 partition Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The present disclosure relates to a bilateral through power segment and traction power system. The sectionalized traction power supply system is applied to a bilateral/through traction power supply system, is arranged between adjacent traction transformer stations, replaces current sectionalized stations/AT stations/parallel switch stations and the like, and divides a traction network into left and right sections according to the adjacent two groups of electric sectionalized modes so as to realize sectionalized protection and control of the contact network and reduce the fault influence range; the contact networks at two sides of the two groups of electric sections are communicated in the section stations, so that in-phase bilateral power supply between two adjacent traction transformer stations is realized; the neutral section in the middle of the two groups of electric sections is powered by a bus in the section station, and the locomotive passes through according to the electroless split-phase and uninterrupted power mode, so that the purpose of canceling the traditional electric split-phase is realized. Therefore, the method is beneficial to reducing the electric split phase in the traction power supply system, improves the train operation efficiency, realizes reasonable segmentation of the contact network, reduces the fault influence range and improves the power supply reliability and flexibility.
Description
Technical Field
The disclosure relates to the technical field of traction power supply, in particular to a bilateral through power supply segmentation institute and a traction power supply system.
Background
In recent years, the mileage of electrified railways is rapidly developed, and electric traction is a power traction mode capable of replacing oil with electricity in various transportation modes, so that the energy advantage is obvious. The traditional traction power supply system usually adopts a unilateral power supply mode, and the unilateral power supply system consists of an external power supply, a traction substation, a subarea substation, an autotransformer (Autotransformer, AT) substation, an opening and closing substation, a contact network (namely a traction network) and the like, wherein the electric phase splitting is arranged in the traction substation and the subarea substation, and a neutral section non-electric area is formed while the loads of all phases are balanced; meanwhile, in order to prevent the pantograph of the locomotive from running into the dead zone in an electrified manner, the locomotive generally cuts off power in advance and passes through inertia when passing through the electric split phase.
In-phase unilateral power supply is generally adopted in the traction power supply system of the electrified railway in China, as shown in fig. 1 or 2, the system consists of an external power supply, a traction substation, a subarea (AT (automatic), an opening and closing station and the like), a contact net and the like, and electric phase splitting is required to be arranged AT the traction substation and the subareas among the traction substations. The electric split phase causes a dead zone, when a train passes, the on-board main circuit breaker needs to be disconnected in advance and then the inertial pass is carried out, and then the main circuit breaker is closed to continuously take electricity from the contact net, so that each split phase generates a power-losing process, the speed of the train is reduced, overvoltage is generated, and even accidents that a locomotive falls into the electric split phase dead zone and cannot be started can occur. Particularly in complicated and difficult mountainous areas, large slopes and heavy-load railways, the influence factors of electric phase separation are increasingly focused by all parties, and how to reduce (cancel) the electric phase separation is often the focus of attention of all parties.
Disclosure of Invention
To solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a bilateral through power segment and traction power system.
The present disclosure provides a segment station, which is applied to a bilateral/through traction power supply system, is arranged between adjacent traction substation stations, and replaces a current segment station/AT station/parallel switch station and the like;
The overhead contact system at the position of the section is arranged in the form of two adjacent groups of electric sections, and the traction network is divided into a left section and a right section (namely two sections) so as to realize the section protection and control of the overhead contact system and reduce the fault influence range;
The contact networks at two sides of the two groups of electric sections are communicated in the section stations, so that in-phase bilateral power supply between two adjacent traction transformer stations is realized;
the neutral section in the middle of the two groups of electric sections is powered by a bus in the section station, and the locomotive passes through according to the electroless split-phase and uninterrupted power mode, so that the purpose of canceling the traditional electric split-phase is realized.
In some embodiments, the segment includes an internal bus and a segment switch; the contact net of the traction power supply system further comprises an electric section and a neutral section, wherein the electric section and the neutral section are arranged at the position of the section;
The sectional switch is respectively connected between the internal bus and the upper and lower travelling outgoing lines of the overhead contact line of the traction power supply system at the position of the section and between the internal bus and the overhead contact line at the position of the neutral section so as to form independent control protection of each section of line.
In some embodiments, the sectionalizer includes a circuit breaker and associated isolation and control protection.
In some embodiments, in the direct-fed through power system, the overhead line includes a left uplink, a right uplink, a left downlink, a right downlink, and an uplink and a downlink at the neutral segment location at the segment location;
The number of the sectional switches is six, and the sectional switches are respectively connected between the internal bus and the left uplink line, between the internal bus and the left downlink line, between the internal bus and the right uplink line, between the internal bus and the right downlink line, between the internal bus and the uplink line at the neutral section position and between the internal bus and the downlink line at the neutral section position.
In some embodiments, in the AT through power supply system, the overhead line system includes a left upstream T line, a right upstream T line, a left upstream F line, a right upstream F line, a left downstream T line, a right downstream T line, a left downstream F line, a right downstream F line, and upstream T lines, downstream T lines AT neutral segment positions;
The sectional switch comprises a bipolar breaker and a monopolar breaker, the number of the bipolar breaker and the monopolar breaker is six, a left ascending T line incoming line and an ascending F line incoming line are connected to an internal bus through the same bipolar breaker, a right ascending T line incoming line and an ascending F line incoming line are connected to the internal bus through the same bipolar breaker, a left descending T line incoming line and a descending F line incoming line are connected to the internal bus through the same bipolar breaker, a right descending T line incoming line and a descending F line incoming line are connected to the internal bus through the same bipolar breaker, an ascending T line at a neutral section position is connected to the internal bus through a monopolar breaker, and a descending T line at a neutral section position is connected to the internal bus through a monopolar breaker.
In some embodiments, in the AT through power supply system, the overhead line system includes a left upstream T line, a right upstream T line, a left upstream F line, a right upstream F line, a left downstream T line, a right downstream T line, a left downstream F line, a right downstream F line, and upstream T lines, downstream T lines AT neutral segment positions;
The sectionalizer comprises a single-pole circuit breaker, the number of which is ten: the left side goes up T line inlet wire, right side goes up T line inlet wire, left side goes up F line inlet wire, right side goes up F line inlet wire, left side down T line inlet wire, right side down T line inlet wire, left side down F line inlet wire, right side down F line inlet wire and the ascending T line and the descending T line of neutral section position department are connected to interior generating line through corresponding monopole circuit breaker respectively.
The present disclosure also provides a traction power system including any of the aforementioned segments.
In some embodiments, the traction power supply system further comprises a traction substation;
at least one subsection station is arranged between two adjacent traction substations.
In some embodiments, two adjacent sets of electrical segments and a neutral segment therebetween are provided at the location of the segments;
the rail locomotive passes through the neutral section in an uninterruptible power supply mode.
In some embodiments, two adjacent groups of electric segments are arranged in the traction substation and the segment substation, and the rail locomotive passes through the traction substation and the neutral segment in an uninterruptible power mode.
In some embodiments, fiber differential protection is provided between adjacent traction substation and the segment yard; and
When the segments are adjacently disposed, an optical fiber differential protection is disposed between the adjacent segments.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
The bilateral through power supply sectionalizing station and the traction power supply system provided by the embodiment of the disclosure are applied to bilateral/through traction power supply systems, are arranged between adjacent traction power transformation stations, replace the current sectionalizing station/AT station/parallel switching station and the like, are arranged in a manner of two adjacent groups of electric sectionalizing, divide a traction network into left and right sections, realize sectionalizing protection and control of the contact network, and reduce the influence range of faults; the contact networks at two sides of the two groups of electric sections are communicated in the section stations, so that in-phase bilateral power supply between two adjacent traction transformer stations is realized; the neutral section in the middle of the two groups of electric sections is powered by a bus in the section station, and the locomotive passes through according to the electroless split-phase and uninterrupted power mode, so that the purpose of canceling the traditional electric split-phase is realized. According to the technical scheme provided by the embodiment of the disclosure, the traditional partition station/AT station/parallel switch station and the like in the traction power supply system can be replaced by the partition station, and the traditional electric split phases are not arranged in the partition station, so that the electric split phases in the traction power supply system are reduced, the train running efficiency is improved, the reasonable partition of the overhead line system is realized, the fault influence range is reduced, and the power supply reliability and flexibility are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a traction power supply system in a direct supply mode in the related art;
FIG. 2 is a schematic diagram of a traction power supply system with an autotransformer power supply in the related art;
Fig. 3 is a schematic structural diagram of a direct-supply neutral section protection through traction power supply system according to an embodiment of the present disclosure;
Fig. 4 is a schematic structural diagram of a bipolar neutral section protection through traction power supply system of an autotransformer according to an embodiment of the present disclosure;
Fig. 5 is a schematic structural diagram of a autotransformer monopole neutral section protection through traction power supply system according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Aiming at the problems in the background art, under the bilateral/through power supply mode, the contact networks in the group range are in-phase power supply, so that conditions are provided for reducing (even canceling) the electric split phase, on the basis, the fault influence range of the contact networks is expanded due to the fact that long distance is not segmented, the arrangement of the contact network segments can possibly lead to the locomotive to make a fault running through the dead zone when the automatic power failure passing phase is not arranged, and aiming at the problem, the fault influence range of the contact networks is shortened by arranging a traction network structure, a protection configuration, a locomotive running mode and the like, and the flexibility of fault investigation is improved.
Therefore, the embodiment of the disclosure provides a traction network sectionalizer suitable for a bilateral/through power supply mode, and the sectionalizer can replace a traditional sectionalizer/AT/parallel switch station and the like; and further reasonably divide the structure of the traction network, realize the in-phase bilateral/through power supply of the traction network, cancel the phase splitting of electricity, reduce the fault influence range of the traction network, shorten the fault recovery time and integrally improve the power supply reliability of the traction network.
An exemplary description of a dual sided through power segment house and traction power system provided by embodiments of the present disclosure is provided below in connection with fig. 3-5.
In some embodiments, fig. 3 is a schematic structural diagram of a direct-supply two-section traction power supply system according to an embodiment of the disclosure. In combination with fig. 3 and fig. 1, in the conventional direct-supply type traction network structure shown in fig. 1, a twisted connection mode is adopted for the subareas, so that the protection configuration is difficult to cooperate with the traction substation, and the effect of reducing the power outage range is not achieved. Fig. 2 is based on the conventional impedance protection and does not serve to reduce the power outage.
In this regard, the applicant has performed inventive work to improve the wiring of the division stations, and without the provision of parallel switchyard or AT stations, it is possible to form a system structure as shown in any of fig. 3-5, i.e. to form a traction power supply system comprising a division station.
The segments shown in any of fig. 3-5 (in contrast to the segments shown in fig. 1 and 2) have functions other than those of conventional segments (e.g., parallel, cross-over, split-phase, etc.), but rather function as segments, pass-through, and for purposes of illustration, the disclosed embodiments refer to them as "segments".
In some embodiments, fig. 3 is a schematic structural diagram of a direct-supply neutral section protection through traction power supply system according to an embodiment of the present disclosure. Referring to fig. 3, the segment includes: the overhead line system comprises an internal bus 100, a sectionalizer 101, and a contact net of a traction power supply system, wherein the contact net further comprises two groups of adjacent electric sections and neutral sections 102 arranged at the position of the sections; the sectionalizing switch 101 is respectively connected between the bus bar 100 and the upper and lower traveling outgoing lines of the overhead contact line of the traction power supply system at the position of the sectionalizing position and between the bus bar 100 and the overhead contact line at the position of the neutral section 102 to form line sectionalizing protection. Where 103 is a neutral section switch specific to an example of the present disclosure.
In some embodiments, the sectionalizer 101 includes a circuit breaker.
Based on the above, the upper and lower traveling outgoing lines of the sectionalizing station are connected with the two sides of the electric sectionalizing station by adopting a breaker, the traction network is divided into 6 power supply units, namely, the upper and lower traveling neutral sections in the left-right direction are separated, and the neutral section power-off protection can be realized.
Optionally, in the traction power supply system, the sectionalized line in-out breaker can be matched with the traction substation feeder line breaker in a switching manner, and optical fiber differential protection can be arranged to realize independent power interruption and power transmission of each power supply unit.
In some embodiments, with continued reference to fig. 3, in the direct feed through power system, the overhead line includes a left uplink, a right uplink, a left downlink, a right downlink, and an uplink and a downlink at the neutral segment location at each segment location; in each segment, the number of segment switches 101 is six, and six segment switches 101 are respectively connected between the inner bus bar 100 and the left uplink, between the inner bus bar 100 and the right uplink, between the inner bus bar 100 and the left downlink, between the inner bus bar 100 and the right downlink, between the inner bus bar 100 and the uplink at the neutral segment position, and between the inner bus bar 100 and the downlink at the neutral segment position.
In the disclosed embodiment, the left uplink, the right uplink, the left downlink, the right downlink, and the uplink and downlink at the neutral section position are connected to the internal bus bar 100 through corresponding segment switches 101 (e.g., circuit breakers), respectively.
The segmented architecture in a direct-supply traction power supply system is described above by way of example in connection with fig. 3. The structure of the segment in the traction power supply system in the AT power supply mode is exemplarily described below with reference to fig. 4 and 5.
In some embodiments, fig. 4 is a schematic structural diagram of an AT power supply system (bipolar) with neutral section protection according to an embodiment of the disclosure. Referring to fig. 4, in the AT through power supply system, the overhead line system includes, AT the position of the section, a left side upstream T line, a right side upstream T line, a left side upstream F line, a right side upstream F line, a left side downstream T line, a right side downstream T line, a left side downstream F line, a right side downstream F line, and upstream T lines and downstream T lines AT the position of the neutral section; the sectionalizer 101 includes bipolar breakers 1011, the number of bipolar breakers 1011 is four, left side up T-line and up F-line are connected to the internal bus 100 through the same bipolar breaker 1011, right side up T-line and up F-line are connected to the internal bus 100 through the same bipolar breaker 1011, left side down T-line and down F-line are connected to the internal bus 100 through the same bipolar breaker 1011, right side down T-line and down F-line are connected to the internal bus 100 through the same bipolar breaker 1011; the number of the single-pole circuit breakers 1011 is 2, and the upward T-line at the neutral section position is connected to the internal bus bar 100 through one single-pole circuit breaker 1011, and the downward T-line at the neutral section position is connected to the internal bus bar 100 through one single-pole circuit breaker 1011.
In contrast to fig. 2, for the AT power supply mode of the high-speed railway, the partition wiring shown in fig. 2 can meet the requirement of setting the segment protection, but the setting of the segment protection by the uplink and downlink parallel points formed by the AT is difficult. In view of this, by combining the actions of the AT station and the above-mentioned sectional station, the applicant has creatively worked to improve the main wiring of the AT station and the AT sectional station, so that the AT sectional station can be formed, and can be applied to the two-section type and multi-section type bilateral power supply traction network system structure, as shown in fig. 4.
In some embodiments, fig. 5 is a schematic structural diagram of an AT power (monopole) neutral section protection through traction power system according to an embodiment of the present disclosure. Referring to fig. 5, in the AT through power supply system, the overhead line system includes, AT the position of the segment, a left side upstream T line, a right side upstream T line, a left side upstream F line, a right side upstream F line, a left side downstream T line, a right side downstream T line, a left side downstream F line, a right side downstream F line, and upstream T lines and downstream T lines AT the position of the neutral segment; the sectionalizer 101 includes single-pole circuit breakers 1012, the number of which is ten; the left side upward T line, the right side upward T line, the left side upward F line, the right side upward F line, the left side downward T line, the right side downward T line, the left side downward F line, the right side downward F line, and the upward T line and the downward T line at the neutral section position are connected to the internal bus 100 through the corresponding monopole circuit breakers 1012, respectively.
In the embodiment of the present disclosure, the segment switch 101 is further improved, and the bipolar breaker 1011 shown in fig. 4 is replaced with a single-pole breaker 1012 to separate the T line and the F line, so that by providing the single-pole breaker 1012 for both the traction substation and the AT segment, the faults of the T line (i.e., the contact line) and the F line (i.e., the positive feeder line) can be distinguished.
Therefore, for a more complex AT traction network, the contact network between the two traction substations is strictly divided into a plurality of sections according to T lines and F lines, and protection is respectively arranged, so that the contact network faults can be reduced to be within a controllable range as far as possible, and the reliability and the usability of the whole traction power supply system are improved.
In other embodiments, other types of switches may be used to connect the left upstream T-line, the right upstream T-line, the left upstream F-line, the right upstream F-line, the left downstream T-line, the right downstream T-line, the left downstream F-line, the right downstream F-line, and the upstream T-line and the downstream T-line at the neutral section positions to the internal bus 100, respectively, so as to facilitate the differentiation of faults of different segment lines.
In the segmentation place provided by the embodiment of the disclosure, no electric phase separation is arranged at the position of the segmentation place, and the segmentation place comprises: an internal bus 100 and a sectionalizer 101; the sectionalizer 101 is connected between the internal bus 100 and the upper and lower lines of the overhead line at the position of the sectionalizer and between the internal bus 100 and the upper and lower lines of the neutral section to form line sectionalizer protection and form neutral section protection, so that the sectionalizer can be applied to a bilateral/through traction power supply system and is arranged between adjacent traction power substations; the traditional partition station/AT station/parallel switch station and the like in the traction power supply system are replaced by the sectionalizing station, and traditional electric phase splitting is not arranged in the sectionalizing station, so that the reduction of electric phase splitting in the traction power supply system is facilitated, the train running efficiency is improved, the reasonable sectionalization of the overhead line system is realized, the fault influence range is reduced, and the power supply reliability and flexibility are improved.
On the basis of the above implementation manners, the embodiment of the disclosure further provides a traction power supply system, which includes any one of the above segments, so that corresponding beneficial effects can be achieved.
In some embodiments, with continued reference to any one of fig. 3-5, the traction power supply system further includes a traction substation; at least one sectioning station is arranged between two adjacent traction substations.
In the embodiment of the disclosure, the number of the sectioning stations can be flexibly set according to the distance between the traction substation and the requirement of sectioning the contact network, so as to form a two-section or multi-section traction network structure. Illustratively, each section of the traction network may have a length of 10km-20km, may be configured in connection with the environment in which it is located, and is not limited by the grade of the line. For example, in complex hard mountainous areas, large ramps, heavy-duty railways, the length of the single-section traction net can be flexibly set, without limitation.
The traction network can be divided into a plurality of power supplies according to requirements, the sectionalized line-in and line-out circuit breakers are matched with the traction substation feeder line circuit breakers or adjacent sectionalized line-in and line-out circuit breakers, and optical fiber differential protection can be arranged to realize independent power failure and power transmission of each power supply unit.
In some embodiments, referring to fig. 3, 4 or 5, in a traction power system, two adjacent sets of electrical segments are provided with a neutral segment 102 in between at the location of the segments; wherein the rail locomotive passes in an uninterruptible power manner at the neutral section 102.
By this arrangement, the neutral section formed by the segments can be protected, thereby improving the running safety of the train (also called a locomotive).
In some embodiments, the neutral section 102 is arranged in both the traction substation and the segmentation substation, and neutral section protection is configured, so that the range of through power supply is further enlarged, and train driving safety is ensured.
In some embodiments, fiber differential protection is provided between adjacent traction substation and the segment yard; and when the segments are adjacently arranged, arranging optical fiber differential protection between the adjacent segments.
In the embodiment of the disclosure, in order to improve operation safety, the following improvements are made:
First, neutral section setting: the traction substation and the sectionalizer are both provided with neutral sections;
second, locomotive operation mode: the neutral section passes through in an uninterruptible power supply mode.
Third, a protection configuration scheme: optical fiber differential protection is respectively arranged between the traction substation and the subsection station and between the traction substation and the adjacent subsection stations, and the ascending line and the descending line are separated, and T, F lines are separated.
The overhead line system can be divided into a plurality of sections with independent upward and downward directions, so that the accurate protection and positioning of the traction network faults can be realized, and the fault power failure range is greatly reduced; and the number and the position selection of the electric segments are flexible, and the electric segments are not limited by conditions such as line gradient and the like.
In the above embodiment, in order to ensure operation safety, the locomotive is not allowed to run in a live-line power-free zone. Therefore, the locomotive can pass through the sectional station without power outage, and the risk of running the power-on and power-off area is avoided.
The neutral section protection can be arranged on the neutral section of the electric section of the overhead line system aiming at the process that the locomotive passes through the electric section dead zone, and the neutral section is electrified by supplying power to the neutral section by the bus bar of the section in normal operation, but no current exists. The locomotive enters the neutral section from the common section or enters the common section from the neutral section, and the risk of running an electroless zone with electricity is avoided during normal operation. When the locomotive runs near the sectionalizing place and the front contact net trips due to faults, the locomotive runs normally, the neutral section is powered by the bus of the section, and the locomotive safely enters the neutral section and takes current from the contact net. At the moment, after the neutral section breaker detects the load current, the neutral section protection is started according to the front tripping signal, the neutral section loses electricity, and the locomotive enters a normal section with power failure at the front through the neutral section by inertia, and is safe from a dead zone to a dead zone.
A schematic drawing of a traction network structure of which the direct supply through power supply mode is provided with neutral section protection is shown in fig. 3; in the AT power supply mode, a schematic drawing of a traction network structure of bipolar multi-section type through power supply neutral section protection is shown in fig. 4, and a schematic drawing of a traction network structure of unipolar multi-section type through power supply neutral section protection is shown in fig. 5. Since the neutral section has no F line, the neutral section protection is only needed to be set for the T line.
After the neutral section protection is set, the locomotive can operate in an electroless split-phase mode, and the contact net can be divided into mutually independent units.
In summary, the neutral section protection structure provided by the bilateral/through power supply traction network segment according to the embodiments of the present disclosure may be divided into a direct power supply mode and an AT power supply mode, where the AT power supply mode is further divided into a bipolar circuit breaker mode and a monopolar circuit breaker mode.
Compared with the prior art, the beneficial effects of the embodiment of the disclosure include:
1. firstly, providing a sectional place and a wiring pattern of the sectional place of the electrified railway;
2. The subsection replaces the traditional various kiosks such as a subarea, an AT (automatic teller machine) and a parallel switch station, and the traction networks on the left side and the right side of the kiosks can be electrically communicated to realize in-phase bilateral/through power supply, so that the purposes of canceling electric split phase and improving power supply capacity are achieved, meanwhile, the traction networks are flexibly divided into a plurality of mutually independent units, and through protection configuration and cooperation, the independent power interruption and power transmission of each unit can be realized, the fault influence range is greatly reduced, and the power supply reliability and flexibility are improved.
3. The problem that the electrified running of the locomotive into the dead zone possibly caused by the segmented power supply of the overhead line system is solved.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The bilateral through power supply sectional station is characterized by being applied to a bilateral/through traction power supply system and being arranged between adjacent traction power transformation stations;
No electrical phase separation is arranged at the position of the segment; the sectioning is used for sectioning the traction power supply system to form independent control protection of line sections, so that the influence range of traction network faults during bilateral/through power supply is reduced;
the section comprises an internal bus and a section switch; the contact net of the traction power supply system further comprises an electric section and a neutral section, wherein the electric section and the neutral section are arranged at the position of the section;
The sectional switch is respectively connected between the internal bus and the upper and lower travelling outgoing lines of the overhead contact line of the traction power supply system at the position of the section and between the internal bus and the overhead contact line at the position of the neutral section so as to form independent control protection of each section of line.
2. The segment of claim 1, wherein the segment switch comprises a circuit breaker and associated isolation switch and control protection.
3. The segment according to claim 1, wherein in the direct-fed through power system, the overhead line comprises a left uplink, a right uplink, a left downlink, a right downlink, and an uplink and a downlink at neutral segment positions at the segment site;
The number of the sectional switches is six, and the sectional switches are respectively connected between the internal bus and the left uplink line, between the internal bus and the left downlink line, between the internal bus and the right uplink line, between the internal bus and the right downlink line, between the internal bus and the uplink line at the neutral section position and between the internal bus and the downlink line at the neutral section position.
4. The segment according to claim 1, wherein in the AT through power supply system, the overhead line system includes a left upstream T line, a right upstream T line, a left upstream F line, a right upstream F line, a left downstream T line, a right downstream T line, a left downstream F line, a right downstream F line, and upstream T lines and downstream T lines AT neutral segment positions;
The sectional switch comprises a bipolar breaker and a monopolar breaker, the number of the bipolar breaker and the monopolar breaker is six, a left ascending T line incoming line and an ascending F line incoming line are connected to an internal bus through the same bipolar breaker, a right ascending T line incoming line and an ascending F line incoming line are connected to the internal bus through the same bipolar breaker, a left descending T line incoming line and a descending F line incoming line are connected to the internal bus through the same bipolar breaker, a right descending T line incoming line and a descending F line incoming line are connected to the internal bus through the same bipolar breaker, an ascending T line at a neutral section position is connected to the internal bus through a monopolar breaker, and a descending T line at a neutral section position is connected to the internal bus through a monopolar breaker.
5. The segment according to claim 1, wherein in the AT through power supply system, the overhead line system includes a left upstream T line, a right upstream T line, a left upstream F line, a right upstream F line, a left downstream T line, a right downstream T line, a left downstream F line, a right downstream F line, and upstream T lines and downstream T lines AT neutral segment positions;
The sectionalizer comprises a single-pole circuit breaker, the number of which is ten: the left side goes up T line inlet wire, right side goes up T line inlet wire, left side goes up F line inlet wire, right side goes up F line inlet wire, left side down T line inlet wire, right side down T line inlet wire, left side down F line inlet wire, right side down F line inlet wire and the ascending T line and the descending T line of neutral section position department are connected to interior generating line through corresponding monopole circuit breaker respectively.
6. A traction power system comprising a segment as claimed in any one of claims 1-5.
7. The traction power system of claim 6, further comprising a traction substation;
at least one subsection station is arranged between two adjacent traction substations.
8. The traction power system of claim 7, wherein two adjacent sets of electrical segments and a neutral segment therebetween are provided at the location of the segments;
the rail locomotive passes through the neutral section in an uninterruptible power supply mode.
9. The traction power system of claim 7, wherein an optical fiber differential protection is provided between adjacent traction substation and the segment; and
When the segments are adjacently disposed, an optical fiber differential protection is disposed between the adjacent segments.
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