CN107769174B - It is a kind of suitable for AT subregion protective device - Google Patents

It is a kind of suitable for AT subregion protective device Download PDF

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Publication number
CN107769174B
CN107769174B CN201711145174.7A CN201711145174A CN107769174B CN 107769174 B CN107769174 B CN 107769174B CN 201711145174 A CN201711145174 A CN 201711145174A CN 107769174 B CN107769174 B CN 107769174B
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transformer
protection
differential
trip
uplink
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CN107769174A (en
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陈娜娜
孙金华
王丹
沈珂婷
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Nanjing Guodian Nanzi Railway Traffic Engineering Co Ltd
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Nanjing Guodian Nanzi Railway Traffic Engineering Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/267Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires

Abstract

The invention discloses it is a kind of it is novel be suitable for AT subregion protective device; this device can be realized to two auto-transformers of a supply arm and the protection of uplink and downlink feeder line: when auto-transformer puts into operation; device can put into differential, differential quick-break, shell overcurrent, decompression, AT from protections and functions such as throwing, reclosing, non electrical quantities, realize the protection to auto-transformer;When auto-transformer is out of service, device can put into the protections such as impedance, current quick-breaking, overcurrent, reclosing and function, realize the protection to route.According to the different methods of operation, the different relaying configuration of flexible choice has saved investment and maintenance cost, avoids failure rate when cooperating from throwing function of conventional two auto-transformer protective devices, improves the reliability of power supply.

Description

It is a kind of suitable for AT subregion protective device
Technical field
The present invention relates to electric railway traction power supply system fields, and in particular to a kind of novel high-speed railway AT subregion Protective device.
Background technique
The high-speed railway Traction networks in China mainly use full Parallel AT traction electric network feeding system at present, have supply voltage High, the advantages that power supply capacity is strong, power supply distance is long, power supply reliability is high.AT is arranged between traction substation and subregion institute in it Institute, when normal operation, the AT institute of same supply arm and subregion institute uplink and downlink contact net parallel operation access the AT institute of the section 2 auto-transformers are configured in subregion institute, one comes into operation, and another spare.Current routine AT subregion is protected for 2 An auto-transformer protective device is respectively configured in platform auto-transformer, when operation auto-transformer breaks down, can pass through The tripping of corresponding auto-transformer protective device, keeps failure auto-transformer out of service, while to spare auto-transformer pair The protective device answered issues " starting from throwing " signal, when spare auto-transformer protective device receives " starting from throwing " signal Afterwards, spare auto-transformer is put into operation, the signal transmitting between two protective devices increases failure probability, can to power supply It is impacted by property.Routine AT subregion, which is protected, simultaneously is respectively configured a feeder protection equipment for uplink and downlink feeder line, increases Equipment and maintenance cost.
Summary of the invention
In view of the above technical problems, the invention proposes a kind of novel AT subregion protective device.Only pass through one Protective device can be realized to two auto-transformers of a supply arm and the protection of uplink and downlink feeder line.Certainly by the operation of failure Coupling transformer is out of service and puts into the throwing process certainly of spare auto-transformer, realizes in a protective device, reduces event Hinder probability, increases power supply reliability.It, can be according to different fortune since this protective device has the function of protecting uplink and downlink feeder line Line mode, flexible configuration defencive function realize that application maximizes, greatly reduce equipment and maintenance cost.
Invention is achieved through the following technical solutions:
The invention protective device can be realized to two auto-transformers of a supply arm and the guarantor of uplink and downlink feeder line Shield.Device have differential, differential quick-break, shell overcurrent, decompression, AT from throwing, impedance, current quick-breaking, overcurrent, reclosing, The protections such as non electrical quantity and function.
The protective device of the novel AT subregion institute of one kind of the invention, protective device ac circuit 6 road protective currents of acquisition: The T line current IT1 of uplink, the F line current IF1 of uplink, the T line current IT2 of downgoing line, downgoing line F line Electric current IF2, AT1 transformer touch shell electric current IP1, AT2 transformer touch shell electric current IP2;2 road voltages: uplink feeder line T line voltage UT1, downlink feeder line T line voltage UT2;
It is calculated by acquisition electric current and voltage by vector method: transformer T line currentTransformer F line electricity StreamTransformer differential currentUplink TF electric currentDownlink Route TF electric currentUplink impedance valueDownstream impedance value ITF12 is the second harmonic value of uplink TF electric current ITF1, and ITF22 is the second harmonic value of downlink TF electric current ITF2.
When auto-transformer puts into operation, device can put into differential, differential quick-break, shell overcurrent, decompression, AT certainly The protections such as throwing, reclosing, non electrical quantity and function realize the protection to auto-transformer;
Only differential, differential quick-break, shell overcurrent and non-ionizing energy loss may be configured as starting AT from throwing function, and decompression Do not start AT after trip protection and throws function certainly.
By taking operating transformer is AT1 transformer as an example, after AT1 transformer fault causes trip protection, device starts AT From throwing function, comprising the following steps:
Step 1: meeting any one protection act condition of differential, differential quick-break, shell overcurrent and non electrical quantity, i.e., jump simultaneously Lock DL1 and DL2;
Step 2: detecting DL1 and DL2 whether all tripping, if all trippings, trip GK1, exits the AT1 transformer of operation Operation;
Step 3: detection GK1 tripping after, if at this time on route voltage UT2 be greater than route have pressure definite value, close a floodgate GK2, Spare AT2 transformer is put into operation.
Step 4: after detection GK2 closes a floodgate, combined floodgate DL1 and DL2.
When meeting uplink o-volt protection operation condition, trip protection 1 is acted, and trip DL1;Meet downgoing line decompression When protection act condition, trip protection 2 is acted, and trip DL2;If reclosing allows, it is overlapped corresponding open circuit when the condition is satisfied Device;
When auto-transformer is out of service, device can put into impedance, current quick-breaking, overcurrent, reclosing etc. protection and Function realizes the protection to route.
The present invention compared with conventional AT subregion institute relaying configuration, have the following advantages that and the utility model has the advantages that
(1) present invention only can be realized by a protective device to two auto-transformers of a supply arm and upper and lower The protection of row feeder line can realize that application maximizes according to the different methods of operation, flexible configuration defencive function, greatly reduce and set Standby and maintenance cost creates huge economic benefit.
(2) AT to two auto-transformers is realized in a protective device from function is thrown, and avoids conventional two certainly Failure rate when cooperating from throwing function of coupling protection equipment for transformer, improves the reliability of power supply, has wide answer Use prospect.
Detailed description of the invention
Fig. 1 (is mutually flowed to feeder breaker stream female for AT subregion institute simplified wiring figure in the embodiment of the present invention with contact net Line is positive direction).
Fig. 2 is the flow chart that AT is thrown certainly in the embodiment of the present invention (by taking operating transformer is AT1 as an example).
Specific embodiment
The present invention is described in further detail below with reference to embodiment, embodiments of the present invention are not limited thereto.
The present embodiment be suitable for AT subregion protective device can realize two auto-transformers to a supply arm And the protection of uplink and downlink feeder line.Device has differential, differential quick-break, shell overcurrent, decompression, AT fast from throwing, impedance, electric current Protections and the functions such as disconnected, overcurrent, reclosing, non electrical quantity.
As shown in Figure 1, being AT subregion institute simplified wiring figure in the embodiment of the present invention (to feeder breaker stream mutually with contact net Flowing to bus is positive direction), the protective device ac circuit suitable for AT subregion of the present embodiment acquires 6 road protective currents: on The T line current IT1 of row line, the F line current IF1 of uplink, the T line current IT2 of downgoing line, the F line of downgoing line are electric Stream IF2, AT1 transformer touch shell electric current IP1, AT2 transformer touch shell electric current IP2;2 road voltages: uplink feeder line T line voltage UT1, downlink feeder line T line voltage UT2;
It is calculated by acquisition electric current and voltage by vector method: transformer T line currentTransformer F line electricity StreamTransformer differential currentUplink TF electric currentDownlink Road TF electric currentUplink impedance valueDownstream impedance value ITF12 is the second harmonic value of uplink TF electric current ITF1, and ITF22 is the second harmonic value of downlink TF electric current ITF2.
When auto-transformer puts into operation, device can put into differential, differential quick-break, shell overcurrent, decompression, AT certainly The protections such as throwing, reclosing, non electrical quantity and function realize the protection to auto-transformer.
When any protection such as differential, differential quick-break, shell overcurrent and non electrical quantity meets operation condition, device trips simultaneously DL1 and DL2.
When device meets uplink o-volt protection operation condition, trip protection 1 is acted, and trip DL1;Meet downgoing line When o-volt protection operation condition, trip protection 2 is acted, and trip DL2;If reclosing allows, it is overlapped when the condition is satisfied corresponding Breaker.
Only differential, differential quick-break, shell overcurrent and non-ionizing energy loss may be configured as starting AT from throwing function, and decompression Do not start AT after trip protection and throws function certainly.
By taking operating transformer is AT1 transformer and differential quick-break movement as an example, if GK1 is coincidence, device determines current Operating transformer is AT1 transformer, if AT1 transformer failure state, fast differential over current protection movement and certainly throwing logic, including with Lower step:
Step 1: device detects that the difference current Id of transformer is greater than differential quick-break movement definite value (definite value can be modified), poor Dynamic fast tripping protection movement, while the DL1 and DL2 that trips;
Step 2: the position of detection DL1 and DL2 does not start AT and throws function certainly if any one breaker is tripping failure; The success if two breakers trip starts AT from action logic is thrown, and trip GK1, and the AT1 transformer of operation is made to exit fortune Row;
Step 3: the position through 6s delay (disconnecting switch actuation time definite value can be modified) detection GK1, if GK1 is still conjunction Position, then exit AT from throwing logic, and report " separate refuse point " alerts;If GK1 is quartile, line voltage distribution UT2 at this time is detected, if UT2 is big There is pressure definite value (definite value can be modified) in route, then close a floodgate GK2, and spare AT2 transformer is made to put into operation;
Step 4: AT is exited certainly if GK2 is still quartile in the position through 6s delay (time definite value can be modified) detection GK2 Throw logic, report " separate and refuse to close " alarm;If GK2 is coincidence, close a floodgate DL1 and DL2;
Step 5: the position through 0.2s delay (time definite value can be modified) detection DL1 and DL2, if any one is still quartile, It then exits AT and is alerted from logic, report " breaker is refused to close " is thrown;If DL1 and DL2 are coincidence, throw successfully certainly.
Fig. 2 is the flow chart that AT is thrown certainly in the embodiment of the present invention (by taking operating transformer is AT1 as an example).
When auto-transformer is out of service, protective device can put into the guarantor such as impedance, current quick-breaking, overcurrent, reclosing Shield and function realize the protection to route.
Impedance, current quick-breaking, overcurrent, overcurrent, reclosing are the operation condition for meeting uplink and downlink route respectively When, trip corresponding uplink and downlink breaker respectively, by taking impedance protection as an example:
When meeting the adaptive impedance protection operation condition of uplink two-period form harmonic wave locking, trip protection 1 is acted, and is jumped DL1, operation condition are as follows:
1. the PT breakage lock device protection element of uplink is not operating;
2.ITF12 < KYLITF1, KYL are secondary harmonic brake coefficient definite value;
3. impedance Z 1 is in corresponding quadrangle active region;
4. time delays arrive.
When meeting the adaptive impedance protection operation condition of downgoing line two-period form harmonic wave locking, trip protection 2 is acted, and is jumped DL2, operation condition are as follows:
1. the PT breakage lock device protection element of downgoing line is not operating;
2.ITF22 < KYLITF2;
3. impedance Z 2 is in corresponding quadrangle active region;
4. time delays arrive.
Above embodiment is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all It is any changes made on the basis of the technical scheme according to the technical idea provided by the invention, each falls within right of the present invention and want It asks within the protection scope of book.

Claims (2)

1. it is a kind of suitable for AT subregion protective device, it is characterised in that: the protective device ac circuit acquires the protection of 6 tunnels Electric current: the T line current IT1 of uplink, the F line current IF1 of uplink, downgoing line T line current IT2, downgoing line F line current IF2, AT1 transformer touch shell electric current IP1, AT2 transformer touch shell electric current IP2;2 road voltages: uplink feeder line T Line voltage UT1, downlink feeder line T line voltage UT2;
It is calculated by acquisition electric current and voltage by vector method: transformer T line currentTransformer F line currentTransformer differential currentUplink TF electric currentDownlink Road TF electric currentUplink impedance valueDownstream impedance value ITF12 is the second harmonic value of uplink TF electric current ITF1, and ITF22 is the second harmonic value of downlink TF electric current ITF2;
When auto-transformer puts into operation, protection and function that device can be put into: differential, differential quick-break, is lost shell overcurrent Pressure, AT realize the protection to auto-transformer from throwing, reclosing, non electrical quantity;
Only differential, differential quick-break, shell overcurrent and non-ionizing energy loss may be configured as starting AT from throwing function, and o-volt protection Do not start AT after tripping and throws function certainly;
If operating transformer is AT1 transformer, after AT1 transformer fault causes trip protection, device starting AT throws function certainly;
If operating transformer is AT2 transformer, after AT2 transformer fault causes trip protection, device starting AT throws function certainly;
Differential, differential quick-break, shell overcurrent and non electrical quantity any protection be when meeting operation condition, device trip simultaneously DL1 and DL2;
When meeting uplink o-volt protection operation condition, trip protection 1 is acted, and trip DL1;Meet downgoing line o-volt protection When operation condition, trip protection 2 is acted, and trip DL2;If reclosing allows, it is overlapped corresponding breaker when the condition is satisfied;
Only differential, differential quick-break, shell overcurrent and non-ionizing energy loss may be configured as starting AT from throwing function, and o-volt protection Do not start AT after tripping and throws function certainly;
When auto-transformer is out of service, protection and function that device can be put into: impedance, current quick-breaking, overcurrent, coincidence Lock realizes the protection to route.
2. it is a kind of suitable for AT subregion guard method, by protective device described in claim 1 realize to one power Two auto-transformers of arm and the protection of uplink and downlink feeder line, it is characterised in that: only poor when auto-transformer puts into operation Dynamic, differential quick-break, shell overcurrent and non-ionizing energy loss may be configured as starting AT and throw function certainly, and not open after o-volt protection tripping Dynamic AT throws function certainly;
If operating transformer is AT1 transformer, after AT1 transformer fault causes trip protection, device starting AT throws function certainly, The following steps are included:
A1: meeting any one protection act condition of differential, differential quick-break, shell overcurrent and non electrical quantity, i.e., simultaneously trip DL1 and DL2;
Whether A2: detecting DL1 and DL2 tripping, if all trippings, trip GK1, keeps the AT1 transformer of operation out of service;
A3: detection GK1 tripping after, if at this time on route voltage UT2 be greater than route have pressure definite value, close a floodgate GK2, will be spare AT2 transformer puts into operation;
A4: after detection GK2 closes a floodgate, combined floodgate DL1 and DL2;
If GK1 is coincidence, device determines that current operating transformer is AT1 transformer, if AT1 transformer failure state, poor Dynamic fast tripping protection movement and certainly throwing logic, comprising the following steps:
B1: device detects that the difference current Id of transformer is greater than differential quick-break and acts definite value, and fast differential over current protection acts, simultaneously Trip DL1 and DL2;
B2: the position of detection DL1 and DL2 does not start AT and throws function certainly if any one breaker is tripping failure;If two Breaker trips success, then starts AT from action logic is thrown, and trip GK1, keeps the AT1 transformer of operation out of service;
B3: being delayed through certain time and detect the position of GK1, if GK1 is still coincidence, exits AT and " separates and refuse from logic, report is thrown Point " alarm;If GK1 is quartile, line voltage distribution UT2 at this time is detected, if UT2 is greater than route and has pressure definite value, close a floodgate GK2, makes standby It is put into operation with AT2 transformer;
B4: being delayed through certain time and detect the position of GK2, if GK2 is still quartile, exits AT and " separates and refuse from logic, report is thrown Close " alarm;If GK2 is coincidence, close a floodgate DL1 and DL2;
B5: being delayed through certain time and detect the position of DL1 and DL2, if any one is still quartile, exits AT from logic is thrown, reports " breaker is refused to close " alarm;If DL1 and DL2 are coincidence, throw successfully certainly;
When auto-transformer is out of service, protective device meets the adaptive impedance protection of uplink two-period form harmonic wave locking When operation condition, trip protection 1 is acted, and jumps DL1, and operation condition is as follows:
The PT breakage lock device protection element of uplink is not operating;
ITF12 < KYLITF1, KYL are secondary harmonic brake coefficient definite value;
Impedance Z 1 is in corresponding quadrangle active region;
Time delays arrive;
When meeting the adaptive impedance protection operation condition of downgoing line two-period form harmonic wave locking, trip protection 2 is acted, and jumps DL2,
Operation condition is as follows:
The PT breakage lock device protection element of downgoing line is not operating;
ITF22 < KYLITF2;
Impedance Z 2 is in corresponding quadrangle active region;
Time delays arrive;
If operating transformer is AT2 transformer, after AT2 transformer fault causes trip protection, device starting AT throws function certainly, The following steps are included:
C1: meeting any one protection act condition of differential, differential quick-break, shell overcurrent and non electrical quantity, i.e., simultaneously trip DL1 and DL2;
Whether C2: detecting DL1 and DL2 tripping, if all trippings, trip GK2, keeps the AT2 transformer of operation out of service;
C3: detection GK2 tripping after, if at this time on route voltage UT1 be greater than route have pressure definite value, close a floodgate GK1, will be spare AT1 transformer puts into operation;
C4: after detection GK1 closes a floodgate, combined floodgate DL1 and DL2.
CN201711145174.7A 2017-11-17 2017-11-17 It is a kind of suitable for AT subregion protective device Active CN107769174B (en)

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Publication number Priority date Publication date Assignee Title
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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* Cited by examiner, † Cited by third party
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KR101172754B1 (en) * 2010-12-07 2012-08-14 김영섭 Selective Protecting System for Parallel Power Supply System of AT system of Electric Railway
CN102340133A (en) * 2011-08-17 2012-02-01 武汉英康铁路电气设备工程有限公司 Method and device for protecting traction feeder line of single-phase power-frequency alternating-current electrified railway
CN102390290B (en) * 2011-09-19 2013-07-10 余家华 Traction power supply system capable of realizing divided power supply of uplink power supply arm and downlink power supply arm in an asynchronous transmission (AT) way
CN103545790A (en) * 2013-11-07 2014-01-29 南京国电南自轨道交通工程有限公司 Autotransformer protecting system suitable for traction substation
CN103715671B (en) * 2013-12-30 2016-04-06 西南交通大学 Guard method jumped by a kind of connection of the high-speed railway supply arm based on current characteristic
CN204118697U (en) * 2014-06-05 2015-01-21 成都交大运达电气有限公司 High-speed overload railway digital AT auto-transformer protective device

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