CN102005737A - Automatic jump selection method of electrified railway feeder line started by external contacts - Google Patents
Automatic jump selection method of electrified railway feeder line started by external contacts Download PDFInfo
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- CN102005737A CN102005737A CN2010105572422A CN201010557242A CN102005737A CN 102005737 A CN102005737 A CN 102005737A CN 2010105572422 A CN2010105572422 A CN 2010105572422A CN 201010557242 A CN201010557242 A CN 201010557242A CN 102005737 A CN102005737 A CN 102005737A
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Abstract
The invention discloses an automatic jump selection method for starting a feeder line protection device by using a back-up protection device of a transformer for closing normally open contacts of corresponding relays when a traction power supply system is subjected to out-phase short circuit or the back-up protection of the traction transformer is to generate override tripping, which belongs to the field of traction power supply relay protection. In the method, the back-up protection device of the traction transformer identifies traction power supply out-phase short circuit faults and closes the alarm relay contacts of the out-phase short circuit according to the distribution range, the current change and other rules of two-phase steady-state angles, the override jump selection relay contacts are closed when the low-voltage and overcurrent protection of the back-up protection device is started and is to trip, and after detecting that the contacts are started, a feeder line protecting device realizes the automatic jump selection of a feeder line circuit breaker according to the corresponding conditions of steady-state angles, current increment and the like. Because no additional primary equipment is needed, the method has low investment; no constant value difficult to set exists so that the enforcement process is simple and convenient; and the automatic jump selection method has the advantages of small protection calculation amount and high reliability as well as selectivity.
Description
Technical field
The invention belongs to traction power supply relaying protection field; the present invention relates to a kind ofly when tractive power supply system generation heterophase short-circuit or traction transformer backup protection will overstep trippings more precisely, the closed corresponding relays normally opened contact of Backup Protection Device for Transformer starts the method that feeder protection equipment selects jumping automatically.
Background technology
Electric railway is strong because of energy-conserving and environment-protective, power performance, become the green traffic mode that China gives priority to, present high-speed railway, heavy haul railway all-electric, according to railway construction planning and present construction progress, the coming years, the electric railway total kilometrage of China will born passenger-cargo freight volume of the overwhelming majority, so traction power supply is more and more higher to the requirement of reliability above 50,000 kilometers.By vast traction power supply relaying protection worker's effort, it is perfect that the Principles of Relay Protection in this field has been tending towards, but the problem of some principle is waited for better solution, under the act two for example (accompanying drawing 1 is a schematic diagram):
Example one; electric locomotive divides phase time (non-Electric region) at the electricity that passes through the traction substation exit; because the driver is less than malfunctioning according to rules operation or the phase-splitting of the automatic mistake of locomotive; may cause along the insulator surface discharge heterophase short-circuit takes place; its fault signature value has surmounted the impedance of feeder protection equipment configuration usually; the identification range of protection such as overcurrent; the feeder protection equipment tripping may cause neutral section insulator; insulator burns; also may make traction transformer backup protection overstep tripping; all feeder line dead electricity that cause bus to connect; enlarged the accident scope; owing to do not allow to overlap after the backup protection tripping operation, so the service restoration time lengthening.At the fault of this type, vast relaying protection worker has proposed several solutions.Document " traction substation heterophase short-circuit fault and conventional protection for feed line action behavior analyze " (the 24th page of railway society the 22nd the 4th phase of volume of August in 2000) during to heterophase short-circuit the protection for feed line action behavior analyze, the scheme that current quick and special impedance protection match has been proposed at last, but owing in feeder protection equipment, introduce free phase voltage, need the extra voltage transformer that increases, promptly increase investment and brought inconvenience to maintenance again, also had the problem that is difficult to adjust simultaneously; Document " research of heterophase short-circuit of tractive power supply system protection philosophy " (Southwest Jiaotong University's 2004 master's thesis) has carried out theory analysis and has carried out simulation study in conjunction with large-current electric arc model, locomotive load model heterophase short-circuit, proposed based on two supply arm voltage between phases amplitudes change and comprehensive harmonic content than the protection scheme of higher (3 subharmonic are main) these characteristics, this scheme also needs to increase voltage transformer, in addition, the switching of the complicated and changeable and power compensating device of electric locomotive operating condition all will make its reliability reduce; Document " based on the power supply traction network different-phase circuit protection of fault component correlation analysis " (the 82nd page of Automation of Electric Systems the 6th phase of volume 25 days the 31st March in 2007) presents reverse symmetry according to biphase current fault component waveform; proposition utilizes this feature of relevant function method rapid extraction and makes the feeder means tripping operation; this scheme is because correlation analysis algorithm has increased more amount of calculation; be subjected to the influence of wave distortion bigger; for double-tracking railways; this scheme may cause the repeatedly breaker tripping and closing of feeder line circuit breaker of two supply arms; power supply unit is caused greater impact, and the selectivity of protection can not get guaranteeing.Generally speaking, the protection philosophy of heterophase short-circuit fault also needs perfect.
Example two; feeder line generation conventional fault; but because the improper device that causes of feeder protection equipment fixed value adjusting is refused to jump; thereby may cause traction transformer backup protection overstep tripping; enlarged the power failure scope; this kind case is much at electric railway, but industry does not provide feasible remedial measure at present.
Summary of the invention
Technical problem to be solved by this invention is: when tractive power supply system generation heterophase short-circuit or traction transformer backup protection will overstep trippings, how to excise fault or unlikely overstep tripping and take place.
To achieve these goals, the present invention takes following technical scheme to realize:
For ease of describing, this specification definition term is as follows:
The voltage leading phase defines mutually with voltage delay: each supply arm of traction substation left and right directions, each supply arm all has traction power supply bus separately, bus voltage over the ground is phase voltage separately, during normal duty, it is motionless to fix one of them phase voltage vector in vector plane figure, another phase voltage vector is according to counterclockwise rotating until overlapping with the vector of fixing, as rotate angle and abbreviate the voltage leading phase as less than the then fixing phase voltage vector of 180 degree, rotating vector is the voltage delay phase, as rotating angle greater than abbreviating the voltage delay phase as in the then fixing phase voltage vector of 180 degree, rotating vector is the voltage leading phase.
The electric railway feeder line that is started by external contact selects the jumping protection automatically, it is characterized in that, comprises the following steps:
1) at first judges by the traction transformer backup protection equipment whether electric phase-splitting is short-circuited, according to being: as the different-phase circuit protection input, the stable state merit angle of then seeing the voltage leading phase whether at the stable state merit angle of four-quadrant and voltage delay phase whether at second quadrant, whether synchronously the two all satisfy and then declare the increase of biphase current increment in continuing time-delay, above condition all satisfies then closed heterophase short-circuit alarm and leaves contact, pulse width T 1 scalable;
2) up-downgoing traction power supply feeder protection equipment detect in real time heterophase short-circuit alarm open into, if any open into and feeder line select automatically and jump protection and drop into, then next step judge to measure impedance whether in four-quadrant, as then selecting the jumping protection to start automatically, otherwise judge that whether heterophase short-circuit alarm open into contact line current increment after displacement greater than 100A, continue the maximum 200ms of judgement time, the overtime logic that then withdraws from, jump startup as satisfying then choosing automatically, automatically after choosing was jumped and started, the condition of jumping as choosing in setting time was all set up then outlet tripping operation and startup single shot reclosing;
3) judge whether and to have overstep tripping to take place by the traction transformer backup protection equipment, as the choosing of bypassing the immediate leadership is jumped, and protection drops into and the overcurrent protection of low-voltage startup starts, when overcurrent protection outlet tripping operation also has time T 2 then closure bypass the immediate leadership and select tripping to go out the contact, pulse width T 3 is adjustable;
4) all feeder protection equipments that link to each other with the traction bus detect to bypass the immediate leadership in real time and select tripping to go into; if any open into and feeder line select automatically and jump protection and drop into; then next step judgement is bypassed the immediate leadership and is selected tripping whether to go into before the displacement in the 100ms contact line current increment once greater than 100A; in this way, whether declare feeder line stable state merit angle again [50
o, 80
o] interval, select the jumping condition to set up automatically as satisfying then to bypass the immediate leadership, the condition of jumping as the choosing automatically of bypassing the immediate leadership in setting time is thereafter set up then outlet always and is tripped, and does not start reclosing.
Feeder line selects the basic principle of jumping automatically when at first introducing heterophase short-circuit among the present invention:
The transformer of multiple special wiring has been adopted in electric railway, and they and common three-phase power transformer majority on the analytical method of electric property and mathematical modeling is distinguished to some extent.Low-pressure side generation heterophase short-circuit fault for the traction transformer of different wiring such as Y/ △-11 wiring, the wiring of star extend-triangle balance, Scott wiring, single-phase wiring (containing single-phase three winding connections, V/ V wiring and V/X wiring), right-angled intersection wiring, distortion Woodbridge wiring, its ifq circuit is through after the equivalent variations repeatedly, basically finally can be converted to the equivalent circuit shown in the accompanying drawing 2, for the traction transformer of some kind, the Z among the figure
OEqual 0.With star extend-triangle wiring balancing transformer is example, establishes
,
Be respectively two supply arm equivalent potentials, Z, Z
OThe reduced value in equivalent circuit for electric power system and transformer impedance, R is the heterophase short-circuit arc resistance,
Be short circuit current,
,
Be respectively two supply arm busbar voltages,
,
Be respectively two supply arms and measure impedance, according to circuit shown in the accompanying drawing 2 try to achieve the heterophase short-circuit electric current, to measure impedance as follows:
Have for star extend-triangle wiring balancing transformer
So:
Can obtain thus voltage leading phase (α phase) and voltage delay mutually the measurement track of (β phase) see accompanying drawing 3.By the measurement distribution of impedance rule of accompanying drawing 3 as can be known, voltage leading phase stable state merit angle always is distributed in four-quadrant; Voltage delay phase stable state merit angle sees that theoretically the increase with R extends to first quartile from two quadrant, and in fact R is less, is distributed in second quadrant in the actual measurement.As can be seen, conventional impedance protection may be difficult to action, because short-circuit impedance (particularly resistive component) obviously increases than conventional fault, overcurrent, quick-break and current increment protection also may not can be moved.The size of θ is relevant with the type of traction transformer among Fig. 3, and balancing transformer is 45
o, Y/ △-11 transformer is 60
o, other is not enumerated one by one.
The distribution and the electric current at the present invention two-phase stable state merit angle during according to heterophase short-circuit change the isotactic rule, have invented the heterophase short-circuit feeder line and have selected the jumping method automatically.
Introduce below traction transformer backup protection among the present invention will overstep tripping the time feeder protection equipment select the principle of jumping automatically:
The traction transformer backup protection is the backup protection of traction transformer faults, is again the backup protection far away of feeder fault simultaneously, finishes the overflow protecting element of the normally low-voltage startup of reserve function far away.When feeder line breaks down; the overflow protecting element that the low-voltage of traction transformer backup protection starts also can start usually; but because its tripping operation time-delay big than the main protection component of feeder line; so generally all be feeder line tripping operation earlier; the backup protection of failure removal rear haulage transformer is returned immediately; the selectivity of relaying protection is guaranteed; but when the protection for feed line tripping; backup protection overflow protecting element tripping operation and cause the traction transformer low-pressure side one mutually or two-phase traction power supply bus dead electricity; the whole power down of all feeder lines that are attached thereto; enlarge the accident scope, prolonged the time of restoring electricity.During the feeder line short trouble, its merit angular region is generally [50
o, 80
o] interval, current increment is nearly all greater than 100A (sub-value), at 100ms in the time period, goes out the closing of contact as the tripping of selecting of traction transformer backup protection equipment, and then protection for feed line quickens tripping operation.The present invention by above-mentioned principle constituted the traction transformer backup protection will overstep tripping the time feeder protection equipment select the method for jumping automatically.
The beneficial effect that the present invention reached:
The present invention changes isotactic by the traction transformer backup protection equipment according to the distribution at two-phase stable state merit angle and electric current and restrains and discern traction power supply heterophase short-circuit fault and closed heterophase short-circuit alarm relay contact; relay contact is jumped in the closure choosing of bypassing the immediate leadership when backup protection equipment low-voltage overcurrent protection starts and is about to trip, and feeder protection equipment will realize that the automatic choosing of feeder line circuit breaker jumps according to stable state merit angle and the respective conditions such as current increment of self after opening with upper contact detecting.The present invention need not extra primary equipment, invests very little; Be not difficult to the definite value of adjusting, implementation process is simple and convenient; The protection amount of calculation is little, and the reliability height has been taken into account selectivity simultaneously.
Description of drawings
Fig. 1 is existing a kind of tractive power supply system structure and fault schematic diagram thereof.
Fig. 2 is
The heterophase short-circuit of tractive power supply system faultEquivalent circuit diagram.
Fig. 3 is
During the heterophase short-circuit faultVoltage leading phase (α phase) and voltage delay be the impedance measurement track schematic diagram of (β phase) mutually.
Fig. 4 selects the protection logic diagram of jumping automatically for the electric railway feeder line that is started by external contact of the present invention.
Embodiment
Implementation step of the present invention is as follows:
According to aforementioned definition about voltage leading phase, hysteresis phase, when the traction transformer backup protection equipment normally moves it is distinguished and record, specifically comprise the following steps:
1) at first judges by the traction transformer backup protection equipment whether electric phase-splitting is short-circuited, according to being: as the different-phase circuit protection input, the stable state merit angle of then seeing the voltage leading phase whether at the stable state merit angle of four-quadrant and voltage delay phase whether at second quadrant, whether synchronously the two all satisfy and then declare the increase of biphase current increment in continuing time-delay, above condition all satisfies then closed heterophase short-circuit alarm and leaves the contact, pulse width T 1 scalable, its recommendation are 100ms;
2) up-downgoing traction power supply feeder protection equipment detect in real time heterophase short-circuit alarm open into, if any open into and feeder line select automatically and jump protection and drop into, then next step judge to measure impedance whether in four-quadrant, as then selecting the jumping protection to start automatically, otherwise judge that whether heterophase short-circuit alarm open into contact line current increment after displacement greater than 100A, continue the maximum 200ms of judgement time, the overtime logic that then withdraws from, jump startup as satisfying then choosing automatically, automatically after choosing was jumped and started, the condition of jumping as choosing in setting time was all set up then outlet tripping operation and startup single shot reclosing;
3) judge whether and to have overstep tripping to take place by the traction transformer backup protection equipment, as the choosing of bypassing the immediate leadership is jumped, and protection drops into and the overcurrent protection of low-voltage startup starts, when overcurrent protection outlet tripping operation also has time T 2 then closure bypass the immediate leadership and select tripping to go out the contact, pulse width T 3 is adjustable, the recommendation of T2 is 200ms, and the recommendation of T3 is 60 ms;
4) all feeder protection equipments that link to each other with the traction bus detect to bypass the immediate leadership in real time and select tripping to go into; if any open into and feeder line select automatically and jump protection and drop into; then next step judgement is bypassed the immediate leadership and is selected tripping whether to go into before the displacement in the 100ms contact line current increment once greater than 100A; in this way, whether declare feeder line stable state merit angle again [50
o, 80
o] interval, select the jumping condition to set up automatically as satisfying then to bypass the immediate leadership, the condition of jumping as the choosing automatically of bypassing the immediate leadership in setting time is thereafter set up then outlet always and is tripped, and does not start reclosing.
Implemented according to the protection logic of accompanying drawing 4 afterwards, during actual the use, the relevant time-delay in this logic diagram is a recommendation, need not usually to change, and the definite value that is difficult to adjust so the present invention does not have to need careful consideration basically, implementation process is also simple and reliable.
The present invention is illustrated according to embodiment, should be appreciated that but the foregoing description does not limit the present invention in any form, and all employings are equal to replaces or the technical scheme that form obtained of equivalent transformation, all drops within protection scope of the present invention.
Claims (3)
1. an electric railway feeder line that is started by external contact selects the jumping method automatically, it is characterized in that, comprises the following steps:
1) at first judges by the traction transformer backup protection equipment whether electric phase-splitting is short-circuited, according to being: as the different-phase circuit protection input, the stable state merit angle of then seeing the voltage leading phase whether at the stable state merit angle of four-quadrant and voltage delay phase whether at second quadrant, whether synchronously the two all satisfy and then declare the increase of biphase current increment in continuing time-delay, above condition all satisfies then closed heterophase short-circuit alarm and leaves contact, pulse width T 1 scalable;
2) up-downgoing traction power supply feeder protection equipment detect in real time heterophase short-circuit alarm open into, if any open into and feeder line select automatically and jump protection and drop into, then next step judge to measure impedance whether in four-quadrant, as then selecting the jumping protection to start automatically, otherwise judge that whether heterophase short-circuit alarm open into contact line current increment after displacement greater than 100A, continue the maximum 200ms of judgement time, the overtime logic that then withdraws from, jump startup as satisfying then choosing automatically, automatically after choosing was jumped and started, the condition of jumping as choosing in setting time was all set up then outlet tripping operation and startup single shot reclosing;
3) judge whether and to have overstep tripping to take place by the traction transformer backup protection equipment, as the choosing of bypassing the immediate leadership is jumped, and protection drops into and the overcurrent protection of low-voltage startup starts, when overcurrent protection outlet tripping operation also has time T 2 then closure bypass the immediate leadership and select tripping to go out the contact, pulse width T 3 is adjustable;
4) all feeder protection equipments that link to each other with the traction bus detect to bypass the immediate leadership in real time and select tripping to go into; if any open into and feeder line select automatically and jump protection and drop into; then next step judgement is bypassed the immediate leadership and is selected tripping whether to go into before the displacement in the 100ms contact line current increment once greater than 100A; in this way, whether declare feeder line stable state merit angle again [50
o, 80
o] interval, select the jumping condition to set up automatically as satisfying then to bypass the immediate leadership, the condition of jumping as the choosing automatically of bypassing the immediate leadership in setting time is thereafter set up then outlet always and is tripped, and does not start reclosing.
2. the electric railway feeder line that is started by external contact according to claim 1 selects the jumping method automatically, and it is characterized in that: in described step 1), pulse width T 1 is 100ms.
3. the electric railway feeder line that is started by external contact according to claim 1 selects the jumping method automatically, and it is characterized in that: in described step 3), T2 is 200ms, and T3 is 60 ms.
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| CN2010105572422A CN102005737B (en) | 2010-11-24 | 2010-11-24 | Automatic jump selection method of electrified railway feeder line started by external contacts |
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| CN2010105572422A CN102005737B (en) | 2010-11-24 | 2010-11-24 | Automatic jump selection method of electrified railway feeder line started by external contacts |
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| CN102005737B CN102005737B (en) | 2013-11-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429112A (en) * | 2015-11-03 | 2016-03-23 | 成都交大许继电气有限责任公司 | Novel feeder protection system suitable for high speed rails and feeder protection method thereof |
| CN109435784A (en) * | 2018-10-23 | 2019-03-08 | 中国铁路总公司 | A kind of excessive phase fault processing method in ground and system |
| CN113036734A (en) * | 2020-09-21 | 2021-06-25 | 西南交通大学 | Traction network power supply arm relay protection method based on directional current increment element |
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2010
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429112A (en) * | 2015-11-03 | 2016-03-23 | 成都交大许继电气有限责任公司 | Novel feeder protection system suitable for high speed rails and feeder protection method thereof |
| CN105429112B (en) * | 2015-11-03 | 2017-12-26 | 成都交大许继电气有限责任公司 | A kind of method of protection for feed line system protection feeder line suitable for high ferro |
| CN109435784A (en) * | 2018-10-23 | 2019-03-08 | 中国铁路总公司 | A kind of excessive phase fault processing method in ground and system |
| CN109435784B (en) * | 2018-10-23 | 2021-07-23 | 中国铁路总公司 | Ground neutral-section passing fault processing method and system |
| CN113036734A (en) * | 2020-09-21 | 2021-06-25 | 西南交通大学 | Traction network power supply arm relay protection method based on directional current increment element |
| CN113036734B (en) * | 2020-09-21 | 2022-11-22 | 西南交通大学 | Traction network power supply arm relay protection method based on directional current increment element |
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| CN102005737B (en) | 2013-11-20 |
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Effective date of registration: 20141204 Address after: High road high tech Zone of Nanjing City, Jiangsu Province, No. 20 210061 Patentee after: NARI Technology Development Co., Ltd. Patentee after: SGCC NARI Nanjing Control System Co., Ltd. Address before: High road high tech Zone of Nanjing City, Jiangsu Province, No. 20 210061 Patentee before: NARI Technology Development Co., Ltd. |