CN105305390A - Setting calculation optimization method for direct feeding traction network distance protection - Google Patents

Setting calculation optimization method for direct feeding traction network distance protection Download PDF

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Publication number
CN105305390A
CN105305390A CN201510792099.8A CN201510792099A CN105305390A CN 105305390 A CN105305390 A CN 105305390A CN 201510792099 A CN201510792099 A CN 201510792099A CN 105305390 A CN105305390 A CN 105305390A
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Prior art keywords
section
traction
action
protection
optimization method
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CN201510792099.8A
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Chinese (zh)
Inventor
张永浩
龚仁敏
仇向东
滕晓雷
周庆捷
王梦兰
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BEIJING JOIN BRIGHT ELECTRIC POWER TECHNOLOGY Co Ltd
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BEIJING JOIN BRIGHT ELECTRIC POWER TECHNOLOGY Co Ltd
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Abstract

The invention discloses a setting calculation optimization method for a direct feeding traction network distance protection. A power supply system of a traction network is a single-phase power frequency alternating current system; locomotives obtain current through a contact network T; the current flows back to substations through steel rails R after passing through the locomotives; feeder lines in various traction substations are free of an electrical contact in the traction network in a normal operation; each electric locomotive and each power supply arm obtain electricity from one traction substation; and in a double-track section, two lines of an uplink section I and a downlink section II obtain electricity in the same traction substation, but the middle parts or the tail ends of the lines are respectively independent and are not connected with each other in parallel. The method comprises the steps as follows: (1) the section I, the selectivity of the section I is ensured in priority and setting is carried out according to escape of a short circuit at the tail end of each line; and (2) the section II, setting is carried out on the protection range according to the longest distance in various power supply modes.

Description

Direct feeding system Traction networks coordinating and setting distance protections optimization method
Technical field
The present invention relates to the technical field of the safety of electric railway traction power supply system, relate to a kind of direct feeding system Traction networks coordinating and setting distance protections optimization method particularly.
Background technology
The fail safe of electric railway traction power supply system is the complex structure, the faults frequent that ensure important prerequisite, particularly Traction networks that train normally runs, and without for subsequent use, the correct operation of relaying protection seems particularly important.Distance protection is the main protection of Traction networks.The most frequently used supply power mode that the general fast railway of direct feeding system with return wire Shi Shi China adopts; multiple operation form is had under this supply power mode; the definite value scheme of current main flow need for different power-supplying forms; definite value is overlapped more to Traction networks feeder line distance protection design; when power-supplying forms changes; artificial switching definite value is interval, and this adds the complexity of operator on duty's operation and contingent fortuitous event undoubtedly, causes protection incorrect operation probability to increase.Therefore be necessary to simplify the adaptive setting scheme of current direct power supply.
And in current actual concrete protection scheme, some scheme directly adopts a set of fixing impedance, does not take different measuring impedance for power-supplying forms different under direct feeding system.
Direct feeding system is main protection with distance protection, arranges two sections of (I, II section) formula distance protections, and in conjunction with schemes such as comprehensive harmonics restraint, is equipped with current quick, rate of current rise protection etc. simultaneously.During normal power supply, distance I segment protect scope is 85% protected circuit L 1, II segment protect scope is L 1total length, safety factor gets 1.2 ~ 1.5.Switching protected circuit length during over-zone feeding is two supply arm sums, and computational methods are similar to normal power supply.Roundabout or end is in parallel time, whether protection is set according to section post, designs each self-corresponding two-part segment distance protection definite value scheme.Different definite value schemes is taked for different supply power modes, when supply power mode changes, switches definite value interval.
When power-supplying forms changes, artificial switching definite value is interval, and this adds the complexity of operator on duty's operation and contingent fortuitous event undoubtedly, causes protection incorrect operation probability to increase.Secondly, in normal power supply or the unshielded over-zone feeding situation of section post, the selectivity that two segment protects can not realize the superior and the subordinate is set, but therefore can loses the quick-action of line end 15% part.Finally, in actual concrete protection scheme, some scheme directly adopts a set of fixing impedance, does not take different measuring impedance for power-supplying forms different under direct feeding system.And adopt not in commensurate's measurement impedance scheme, unit measurement impedance according to different, then definite value is different, so the actual range of protection is not identical yet.
Multiple operation form is had under direct feeding system with return wire formula; the definite value scheme of current main flow need for different power-supplying forms; definite value is overlapped more to Traction networks feeder line distance protection design; when power-supplying forms changes; artificial switching definite value is interval; this adds the complexity of operator on duty's operation and contingent fortuitous event undoubtedly, causes protection incorrect operation probability to increase.Compare electric power system, the mode of tractive power supply system is relatively simple, is therefore necessary to simplify the adaptive setting scheme of current direct power supply.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art; a kind of direct feeding system Traction networks coordinating and setting distance protections optimization method is provided; it reaches the balance of the most basic selectivity of relaying protection, quick-action, sensitivity, reliability; only take into account all operational modes by a set of protection definite value; reduce operation maintenance workload; avoid definite value to switch the various unexpected problem caused, promote the reliability of protection act.
Technical solution of the present invention is: this direct feeding system Traction networks coordinating and setting distance protections optimization method, and the electric power system of Traction networks is power frequency single phase alternating current (A.C.) system, and locomotive gets stream by contact line T, after flowing through locomotive, flows back to electric substation through rail R; During normal operation, the feeder line of each traction substation is without electrical communication in Traction networks, and every platform electric locomotive, each supply arm are only from a traction substation power taking; At multiple line section, up I section and descending II section two circuits in same traction substation power taking, but in the line between or end independent not in parallel separately, the method comprises the following steps:
(1) I section: the preferential selectivity ensureing distance I section, by escaping line end short circuit to adjust;
(2) II section: protection range is adjusted by the longest distance under various supply power mode.
This method is for the different power-supplying forms of directly power supply, after considering the measurement impedance factor under different supply power mode, devising one can take into account normally, more district, the definite value scheme of roundabout and end parallel way, interval without the need to staff's manual switchover definite value during supply power mode change, it also avoid in definite value transfer process the various fortuitous events that may occur, setting program is more succinct reliable, therefore the most basic selectivity of relaying protection is reached, quick-action, sensitivity, the balance of reliability, only take into account all operational modes by a set of protection definite value, reduce operation maintenance workload, definite value is avoided to switch the various unexpected problem caused, promote the reliability of protection act.
Accompanying drawing explanation
Fig. 1 to show in prior art tractive power supply system and directly supplies electric model;
Fig. 2 shows according to protection action analysis of the present invention;
Fig. 3 shows and calculates according to end parallel unit measurement impedance of the present invention.
Embodiment
This direct feeding system Traction networks coordinating and setting distance protections optimization method, the electric power system of Traction networks is power frequency single phase alternating current (A.C.) system, and locomotive gets stream by contact line T, after flowing through locomotive, flows back to electric substation through rail R; During normal operation, the feeder line of each traction substation is without electrical communication in Traction networks, and every platform electric locomotive, each supply arm are only from a traction substation power taking; At multiple line section, up I section and descending II section two circuits in same traction substation power taking, but in the line between or end separately independent (as shown in Figure 1) not in parallel, as shown in Figure 2, the method comprises the following steps:
(1) I section: the preferential selectivity ensureing distance I section, by escaping line end short circuit to adjust;
(2) II section: protection range is adjusted by the longest distance under various supply power mode.
This method is for the different power-supplying forms of directly power supply, after considering the measurement impedance factor under different supply power mode, devising one can take into account normally, more district, the definite value scheme of roundabout and end parallel way, interval without the need to staff's manual switchover definite value during supply power mode change, it also avoid in definite value transfer process the various fortuitous events that may occur, setting program is more succinct reliable, therefore the most basic selectivity of relaying protection is reached, quick-action, sensitivity, the balance of reliability, only take into account all operational modes by a set of protection definite value, reduce operation maintenance workload, definite value is avoided to switch the various unexpected problem caused, promote the reliability of protection act.
Preferably, in described step (1), adjust time limit gets 0.1s, and action impedance reactance limit calculates according to formula (1):
X set.1≤K relL 1X 1(1)
Wherein safety factor K rel=0.85, X 1reactance is measured, X for adopting the unit of minimum operational mode set.1for the definite value of adjusting of I segment distance protection, L 1,l 2be the length of two supply arms.Preferably, L is selected in described step (2) 1+ L 2with 2L 1among higher value, adjust time limit gets 0.5s, and action impedance reactance limit calculates according to formula (2):
X s e t .2 ≥ K 1 m ( L 1 + L 2 ) ( X 1 + X m ) , L 2 > L 1 K 1 m · 2 L 1 · ( X 1 + X m ) , L 1 > L 2 - - - ( 2 )
Wherein sensitivity coefficient K lmscope be 1.1-1.2, according to unit measurement impedance Z under maximum operational mode 1+ Z madjust X set.2for the definite value of adjusting of II segment distance protection, X 1,x mfor self-impedance and the mutual impedance of up and down line.
Preferably, K is worked as 1break down, then the protection of electric substation I segment distance is in 0.1s action; Work as K 4during short circuit, section post I section preferentially in 0.1s action, otherwise by electric substation II segment protect in 0.4s action, K 1for 85%L 1fault in scope, K 4for L 2line end fault.
Preferably, K is worked as 2when breaking down, electric substation II section is in 0.4s action; If over-zone feeding K 3be short-circuited, then by section post I section in 0.1s action, K 2for L 1line end fault, K 3for L 2circuit top fault.
Below direct feeding system and measurement impedance are described
1 single line normal power supply
As shown in Figure 1, when normally running, suppose that only up (or descending) has electric locomotive to run, circuit be short-circuited fault time, 1QF unit measurement impedance is Z 0, wherein Z 0for upstream or downstream circuit every kilometer of unit self-impedance.
2 single line over-zone feedings
Suppose only uply have electric locomotive to run, over-zone feeding circuit L 1when breaking down, 1QF unit measurement impedance is circuit unit self-impedance Z 0.
3 parallel connection of multiple line ends and roundabout power supplies
1. roundabout power supply unit measurement impedance
If the self-impedance of up-downgoing Traction networks every kilometer is Z 0, mutual impedance every kilometer is Z m, short dot is positioned at K 1, be L apart from the distance of electric substation k(0≤L k≤ L), electric substation is △ U to the pressure drop of K point, and in up-downgoing Traction networks, electric current is I 1, I 2, total short circuit current is I, if the measurement impedance at circuit breaker 1QF place is Z 1, the measurement impedance at circuit breaker 2QF place is Z 2.
1) circuit is at the K of Fig. 3 1place be short-circuited fault time, 2QF is identical with normal power supply mode to the unit measurement impedance of short dot, is the unit impedance Z of circuit 0.
2) circuit is at K 2when place is short-circuited, wherein 2QF to the pressure drop of short dot is
Δ U 2=L kz 0i 2+ 2 (L-L k) (Z 0i 2-Z mi 2), then
Order Z ′ y h = Z 0 - 2 ( L - L k ) 2 L - L k Z m = Z 0 + βZ m , Then Z 2=(2L-L k) Z ' yh
2. end parallel unit measurement impedance
During multiple line end parallel operation, as circuit K 1place is short-circuited fault, can obtain following formula: 2QF is to short dot K 1pressure drop be Δ U 2=L k(Z 0i 2+ Z mi 1)
The pressure drop of 1QF to short dot K1 is Δ U 1=L k(Z 0i 1+ Z mi 2)+2 (L-L k) (Z 0i 1-Z mi 1)
There is again Δ U 1=Δ U 2, can obtain I 1 = L k 2 L - L k I 2 , Then Z 1 = Δ U I 1 = ( 2 L - L k ) ( Z 0 + L k 2 L - L k Z m )
Note then Z 1=(2L-L k) Z b', in like manner Z 2=L kz b'
This method, for the different power-supplying forms of directly power supply, after considering the measurement impedance factor under different supply power mode, devises and a kind ofly can take into account normal, more district, roundabout and end parallel way definite value scheme.Interval without the need to staff's manual switchover definite value during supply power mode change, it also avoid in definite value transfer process the various fortuitous events that may occur, setting program is more succinct reliable.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection range of technical solution of the present invention.

Claims (5)

1. direct feeding system Traction networks coordinating and setting distance protections optimization method, the electric power system of Traction networks is power frequency single phase alternating current (A.C.) system, and locomotive gets stream by contact line T, after flowing through locomotive, flows back to electric substation through rail R; During normal operation, the feeder line of each traction substation is without electrical communication in Traction networks, and every platform electric locomotive, each supply arm are only from a traction substation power taking; At multiple line section, up I section and descending II section two circuits in same traction substation power taking, but in the line between or end independent not in parallel separately, it is characterized in that: the method comprises the following steps:
(1) I section: the preferential selectivity ensureing distance I section, by escaping line end short circuit to adjust;
(2) II section: protection range is adjusted by the longest distance under various supply power mode.
2. direct feeding system Traction networks coordinating and setting distance protections optimization method according to claim 1, is characterized in that: in described step (1), adjust time limit gets 0.1s, and action impedance reactance limit calculates according to formula (1):
X set.1≤K relL 1X 1(1)
Wherein safety factor K rel=0.85, X 1reactance is measured, X for adopting the unit of minimum operational mode set.1for the definite value of adjusting of I segment distance protection, L 1,l 2be the length of two supply arms.
3. direct feeding system Traction networks coordinating and setting distance protections optimization method according to claim 2, is characterized in that: select L in described step (2) 1+ L 2with 2L 1among higher value, adjust time limit gets 0.5s, and action impedance reactance limit calculates according to formula (2):
X s e t .2 ≥ K l m ( L 1 + L 2 ) ( X 1 + X m ) , L 2 > L 1 K l m · 2 L 1 · ( X 1 + X m ) , L 1 > L 2 - - - ( 2 ) Wherein sensitivity coefficient K lmscope be 1.1-1.2, according to unit measurement impedance Z under maximum operational mode 1+ Z madjust, X set.2for the definite value of adjusting of II segment distance protection, X 1,x mfor self-impedance and the mutual impedance of up and down line.
4. direct feeding system Traction networks coordinating and setting distance protections optimization method according to claim 3, is characterized in that: work as K 1break down, then the protection of electric substation I segment distance is in 0.1s action; Work as K 4during short circuit, section post I section preferentially in 0.1s action, otherwise by electric substation II segment protect in 0.4s action, K 1for 85%L 1fault in scope, K 4for L 2line end fault.
5. direct feeding system Traction networks coordinating and setting distance protections optimization method according to claim 3, is characterized in that: work as K 2when breaking down, electric substation II section is in 0.4s action; If over-zone feeding K 3be short-circuited, then by section post I section in 0.1s action, K 2for L 1line end fault, K 3for L 2circuit top fault.
CN201510792099.8A 2015-11-17 2015-11-17 Setting calculation optimization method for direct feeding traction network distance protection Pending CN105305390A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107887884A (en) * 2017-10-31 2018-04-06 华中科技大学 A kind of power frequency variation guard method and system that impedance is adjusted based on system
CN111711174A (en) * 2019-11-20 2020-09-25 中国国家铁路集团有限公司 Relay protection method for multi-stage switching station series connection traction network

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107887884A (en) * 2017-10-31 2018-04-06 华中科技大学 A kind of power frequency variation guard method and system that impedance is adjusted based on system
CN107887884B (en) * 2017-10-31 2019-05-31 华中科技大学 A kind of power frequency variation guard method and system based on system adjusting impedance
CN111711174A (en) * 2019-11-20 2020-09-25 中国国家铁路集团有限公司 Relay protection method for multi-stage switching station series connection traction network
CN111711174B (en) * 2019-11-20 2022-05-24 中国国家铁路集团有限公司 Relay protection method for multi-stage switching station series connection traction network

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