CN101282037A - Protection method for heterophase short-circuit of tractive power supply system - Google Patents
Protection method for heterophase short-circuit of tractive power supply system Download PDFInfo
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- CN101282037A CN101282037A CNA2008100531594A CN200810053159A CN101282037A CN 101282037 A CN101282037 A CN 101282037A CN A2008100531594 A CNA2008100531594 A CN A2008100531594A CN 200810053159 A CN200810053159 A CN 200810053159A CN 101282037 A CN101282037 A CN 101282037A
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Abstract
The invention relates to relaying protection technical field, especially to a protection method of traction power supply system heterophase short circuit, including following steps: calculating voltage among phases between two power supply arms real time collected by the relaying protection device, finding out fundamental wave effective value of the voltage; comparing the fundamental wave effective value of the voltage among phases with the setting voltage value, if less than or equal to the setting voltage value, calculating the third harmonic effective value of the voltage based on the sampling value of the voltage among phases between two power supply arms; calculating the ratio of the third harmonic effective value and the fundamental wave effective value, and comparing the ratio with the setting coefficient, if more than or equal to the setting coefficient, checking whether the protection device has PT break line sign or not, if not, the traction power supply system generates heterophase short circuit, the protection device sends out tripping signal. The invention can correctly recognise differences between the normal operation or general ground short circuit fault and the heterophase short circuit fault, having advantages of perfect performance and easy implement.
Description
Technical field
The present invention relates to the relaying protection field of tractive power supply system, particularly a kind of different-phase circuit protection method of utilizing detection failure voltage between phases size and triple-frequency harmonics content.
Background technology
Distance protection is distinguished internal fault external fault to what protect the installation place apart from length by measuring short dot, is the protection philosophy that is most widely used in the Transmission Network of Power System.Electric railway traction power supply system is a special user of electric power system, and GPF (General Protection False principles such as distance protection, current protection remain the principal mode that the tractive power supply system protection for feed line adopts at present.In the ordinary course of things, these protections can be moved effectively in conventional short trouble, thereby play the effect of protection for feed line.Yet when system's generation heterophase short-circuit fault, the situation of tripping will appear in GPF (General Protection False.
The heterophase short-circuit of tractive power supply system fault is meant that electric locomotive does not fall the electricity of bow by traction substation and divides phase time, and pantograph produces arcing, makes that finally the insulation device of phase-separating section is breakdown, makes the catastrophe failure of two supply arm short circuits.Electric arc is a kind of superpower self-maintained discharge phenomenon, and lower voltage just can be kept the smooth combustion of suitable long arc, and any solid, liquid or gas all can produce very strong physics and chemical change under its effect.Because arc resistance has non-linear, time variation and high resistive, make the action that distance protection in the conventional protection for feed line often can not be correct.Again because arc fault belongs to high resistive fault; its detection has certain degree of difficulty; so the harm of the near region out-phase fault in this electric substation exit is very large; in recent years; because the conventional protection for feed line tripping phenomenon that the heterophase short-circuit of tractive power supply system fault causes is brought immeasurable loss to rail transportation system.Domestic at present existing document proposed the guard method of some heterophase short-circuits, and for example document [1] has proposed the adaptive guard principle based on the traction substation heterophase short-circuit, and document [2] proposes to utilize schemes such as current quick-breaking and impedance protection cooperate.Sensitivity is low, defective such as be difficult to adjust but these two kinds of methods all exist.
Therefore, be necessary the main transformer connection type and the supply power mode that adopt at electrified section special different-phase circuit protection device to be set in the electric substation exit.
List of references:
[1] Chen Weirong. money clear spring. Wang Weiran. the self adaptation relaying protection [J] of tractive power supply system arc fault. University of Electronic Science and Technology's journal, 1999,22 (4): 392-396.
[2] Grolsch is refined. Wang Yifei. open strength. and traction substation heterophase short-circuit fault and conventional protection for feed line action behavior are analyzed [J]. railway society, 2000,22 (4): 4-27.
Summary of the invention
When the present invention is directed to tractive power supply system generation heterophase short-circuit fault, the situation of GPF (General Protection False akinesia has proposed a kind of different-phase circuit protection method.
The present invention adopts following technical scheme:
A kind of guard method of heterophase short-circuit of tractive power supply system is characterized in that, comprises the following steps:
(1) voltage between phases between two supply arms that protective relaying device is collected in real time calculates, and obtains the first-harmonic effective value of this voltage;
(2) the first-harmonic effective value with voltage between phases compares with the magnitude of voltage of adjusting, if be less than or equal to the magnitude of voltage of adjusting, the judgement that then enters next step;
(3) calculate the triple-frequency harmonics effective value of this voltage according to the sampled value of the voltage between phases between two supply arms;
(4) calculate ratio between triple-frequency harmonics effective value and the first-harmonic effective value, and this ratio and tuning coefficient are compared,, then enter next step judgement as if more than or equal to tuning coefficient;
(5) the check protection device has or not PT broken string sign, if there is not this sign, illustrates that then heterophase short-circuit has taken place tractive power supply system, and protective device sends trip signal.
The guard method of above-mentioned heterophase short-circuit of tractive power supply system can utilize Fourier algorithm to calculate first-harmonic effective value and triple-frequency harmonics effective value in step (1) and the step (3), tuning coefficient is preferably 0.3; The voltage of adjusting is preferably 0.8 times of supply arm line voltage.
The present invention has made full use of out-phase through electric arc when being short-circuited, can make voltage between phases descend significantly and produce the characteristics of a large amount of triple-frequency harmonics, proposed a kind of based on the detection failure voltage between phases size and the guard method of the content of triple-frequency harmonics, can correctly identify normal operation or conventional ground short circuit fault with the difference between the heterophase short-circuit fault; And have perfect performance, the advantage that is easy to realize can be used as the main protection of drawing the net heterophase short-circuit, and combines with the complete protection of traction net feeder line, forms the complete protection of traction net.Particularly, have following outstanding technique effect:
1. theoretically, because the electric pressure not really high (27.5kV) of tractive power supply system, and heterophase short-circuit forms arc channel by 3 to 4 blocks of fiberglass, it is relatively very big that arc length just seems.Therefore, the nonlinear characteristic of electric arc embodies than more obvious in high-voltage electric power system, thereby makes and contain very high harmonic component in the fault phase voltage.Exactly because this reason, guard method of the present invention is just more effective to heterophase short-circuit.
2. in the Shi Ji tractive power supply system, the rectification circuit of electric locomotive can produce harmonic wave.But since adopt be mostly three-phase or six commutating phases, its main harmonic frequency is 300Hz or 600Hz, can not impact criterion of the present invention.
3. in the transient voltage of transformer air-drop and pantograph access moment, also can comprise triple-frequency harmonics.Can utilize the braking of transformer differential protection triple-frequency harmonics to export its locking to the former with false action-proof; To the latter generally speaking the content of triple-frequency harmonics can not surpass 30%, can not impact criterion of the present invention.
4. the principle of the invention is simple, and physical significance is clear, is easy to realize in protective device.
Description of drawings
Fig. 1 is the block diagram of heterophase short-circuit of tractive power supply system guard method of the present invention.
Embodiment
Below in conjunction with realization principle of the present invention and embodiment the present invention is further described.
Electric railway adopts the single phase power supply mode.Get stream symmetry substantially in order to make electric railway from the electric power system three phase network, the method that electric railway has adopted the phase-splitting segmentation to get stream, promptly a phase-splitting section is set every 20 ~ 25km, adjacent phase-splitting section is by two-phase power supply inequality, adjacent phase-separating section has the power supply dead band about 30m, and this dead band mainly is made of neutral section insulator.The effect of neutral section insulator is that the electric energy of the online out of phase of traction is kept apart, and to avoid phase fault, and plays the mechanical connection effect, makes the traction net become as a whole.The phase-splitting insulation device comprises the road way signs of neutral section insulator and relevant neutral section insulator.Neutral section insulator generally is made up of three or four identical glass fibre reinforced plastic insulating spares.The every long 1.8m of glass fibre reinforced plastic insulating spare, wide 25mm, high 60mm, skewed slot is made in its bottom surface, to increase surface distance.Contact wire between the glass insulation spare does not have electricity, is called the neutral zone, and the length of neutral zone is not less than 18m according to the rules.。
Electric locomotive needs strict together program by phase-separating section, what the most circuits of China adopted at present is artificial transformation approach on the car, and when promptly motor supply shop was to phase-separating section, the driver will move back level earlier, close and assist unit, disconnected main circuit breaker, coasting recovers item by item by behind the phase-separating section again.Not only driver's labour intensity is big for this artificial transformation approach, and long by the non-Electric region time, and locomotive speed descends many.The driver forgets that the interval that falls bow or pantograph and contact wire is too little unless you give your whole attention to it, the charged possibly phase-separating section that passes through.For example: when electric locomotive does not fall bow when dividing by electricity that b moves mutually in opposite directions by c, traction net voltage is in the c phase, and---pantograph slips over the gap that insulator forms, and---pantograph---electric locomotive---rail forms the loop, thereby forms creeping discharge.When pantograph continued to slide on insulator, the part of previous discharge formed path by electric arc, progressively flashover is until along the complete flashover of whole insulator, had just formed the phase fault of b, c two-phase, just the heterophase short-circuit of tractive power supply system.
Emulation and experimental studies results show: during tractive power supply system generation out-phase arc short circuit, and fault phase voltage U
BcBigger reduction is arranged; The voltage of two supply arms also changes, the leading phase voltage U
BaRaise hysteresis phase voltage U
CaReduce; Electric substation's exit three-phase voltage all has certain distortion, wherein fault phase voltage U
BcIt is the most serious to distort, and voltage waveform is similar to square wave, contains 3,5,7 a large amount of subharmonic in this explanation fault phase voltage, especially with the content maximum of triple-frequency harmonics.But, because the fundamental voltage amplitude of each current/voltage is different, so can not simply weigh the content of harmonic wave with the amplitude of harmonic wave.The measuring amount I that conventional distance protection is adopted
g, U
CaAnd U
AbIn, triple-frequency harmonics content does not all surpass 15%, has only fault voltage between phases U
BcThe effective value ratio of middle triple-frequency harmonics and first-harmonic is more than 30%.This shows that triple-frequency harmonics content in the fault voltage between phases that heterophase short-circuit takes place is very high, can consider triple-frequency harmonics is introduced failure criterion.
The present invention adopts the fault voltage between phases as measuring amount; the characteristics that contain very high triple-frequency harmonics when utilizing heterophase short-circuit in the fault voltage between phases; constitute the different-phase circuit protection as operating criterion in the formula (1), in case the fault of being short-circuited, the tripping simultaneously of two supply arms is to excise fault.
U
Bc1---the first-harmonic effective value of the fault phase voltage during heterophase short-circuit
U
Zd---the magnitude of voltage of adjusting, rule of thumb be worth, the magnitude of voltage of adjusting is got U
Zd=0.8U
n=22kV, U
nBe supply arm line voltage
U
Bc3---the triple-frequency harmonics effective value in the fault voltage between phases
k
Zd---tuning coefficient gets 0.3
Concrete implementation step is as follows:
(1) the voltage u that at first utilizes Fourier algorithm that protective relaying device is collected in real time
BcCalculate, obtain the first-harmonic effective value U of voltage
Bc1
(2) with U
Bc1With the magnitude of voltage U that adjusts
ZdCompare.If less than setting value, then enter next step judgement;
(3) the voltage u that utilizes Fourier algorithm that protective relaying device is collected in real time
BcCalculate, obtain the triple-frequency harmonics effective value U of voltage
Bc3
(4) calculate U
Bc3/ U
Bc1Numerical value, with this numerical value and tuning coefficient k
ZdCompare.If greater than tuning coefficient, then enter next step judgement;
(5) the check protection device has or not PT broken string sign.If there is not this sign, illustrate that then heterophase short-circuit has taken place tractive power supply system, protective device sends trip signal.
Above-mentioned implementation method shows; the guard method physical significance of content that the present invention is based on the size of detection failure voltage between phases and triple-frequency harmonics is clear; criterion simple by two, that be easy to realize can correctly be discerned heterophase short-circuit fault and conventional short trouble, has using value.
Claims (4)
1. the guard method of a heterophase short-circuit of tractive power supply system is characterized in that, comprises the following steps:
(1) voltage between phases between two supply arms that protective relaying device is collected in real time calculates, and obtains the first-harmonic effective value of this voltage;
(2) the first-harmonic effective value with voltage between phases compares with the magnitude of voltage of adjusting, if be less than or equal to the magnitude of voltage of adjusting, the judgement that then enters next step;
(3) calculate the triple-frequency harmonics effective value of this voltage according to the sampled value of the voltage between phases between two supply arms;
(4) calculate ratio between triple-frequency harmonics effective value and the first-harmonic effective value, and this ratio and tuning coefficient are compared,, then enter next step judgement as if more than or equal to tuning coefficient;
(5) the check protection device has or not PT broken string sign, if there is not this sign, illustrates that then heterophase short-circuit has taken place tractive power supply system, and protective device sends trip signal.
2. the guard method of heterophase short-circuit of tractive power supply system according to claim 1 is characterized in that, utilizes Fourier algorithm to calculate first-harmonic effective value and triple-frequency harmonics effective value in step (1) and the step (3).
3. the guard method of heterophase short-circuit of tractive power supply system according to claim 1 is characterized in that, tuning coefficient is 2.5.
4. the guard method of heterophase short-circuit of tractive power supply system according to claim 1 is characterized in that, the voltage of adjusting is 0.8 times of supply arm line voltage.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005737A (en) * | 2010-11-24 | 2011-04-06 | 国电南瑞科技股份有限公司 | Automatic jump selection method of electrified railway feeder line started by external contacts |
| CN104600679A (en) * | 2014-12-22 | 2015-05-06 | 中铁第四勘察设计院集团有限公司 | Feeder current protection method of traction substation |
| CN109459651A (en) * | 2018-11-12 | 2019-03-12 | 中车永济电机有限公司 | Locomotive converter ground fault detection circuit and method |
| CN111913123A (en) * | 2020-06-29 | 2020-11-10 | 中铁第一勘察设计院集团有限公司 | Method and device for identifying backflow state of traction power supply system |
| CN113341313A (en) * | 2021-06-18 | 2021-09-03 | 中铁第一勘察设计院集团有限公司 | Method for judging quality of protective action behaviors |
| CN113949043A (en) * | 2020-12-17 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of power supply system |
| CN114002614A (en) * | 2020-07-28 | 2022-02-01 | 南京南瑞继保电气有限公司 | Method for judging single-phase earth fault of rotor winding of variable-speed pumped storage unit |
-
2008
- 2008-05-19 CN CNA2008100531594A patent/CN101282037A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005737A (en) * | 2010-11-24 | 2011-04-06 | 国电南瑞科技股份有限公司 | Automatic jump selection method of electrified railway feeder line started by external contacts |
| CN102005737B (en) * | 2010-11-24 | 2013-11-20 | 国电南瑞科技股份有限公司 | Automatic jump selection method of electrified railway feeder line started by external contacts |
| CN104600679A (en) * | 2014-12-22 | 2015-05-06 | 中铁第四勘察设计院集团有限公司 | Feeder current protection method of traction substation |
| CN104600679B (en) * | 2014-12-22 | 2017-08-25 | 中铁第四勘察设计院集团有限公司 | A kind of traction substation current protection method of feeder line |
| CN109459651A (en) * | 2018-11-12 | 2019-03-12 | 中车永济电机有限公司 | Locomotive converter ground fault detection circuit and method |
| CN109459651B (en) * | 2018-11-12 | 2020-09-04 | 中车永济电机有限公司 | Locomotive converter ground fault detection circuit and method |
| CN111913123A (en) * | 2020-06-29 | 2020-11-10 | 中铁第一勘察设计院集团有限公司 | Method and device for identifying backflow state of traction power supply system |
| CN111913123B (en) * | 2020-06-29 | 2023-03-28 | 中铁第一勘察设计院集团有限公司 | Method and device for identifying backflow state of traction power supply system |
| CN114002614A (en) * | 2020-07-28 | 2022-02-01 | 南京南瑞继保电气有限公司 | Method for judging single-phase earth fault of rotor winding of variable-speed pumped storage unit |
| CN113949043A (en) * | 2020-12-17 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of power supply system |
| CN113949043B (en) * | 2020-12-17 | 2023-07-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of power supply system |
| CN113341313A (en) * | 2021-06-18 | 2021-09-03 | 中铁第一勘察设计院集团有限公司 | Method for judging quality of protective action behaviors |
| CN113341313B (en) * | 2021-06-18 | 2024-04-30 | 中铁第一勘察设计院集团有限公司 | Method for judging quality of protection action behavior |
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Open date: 20081008 |