CN102279338A - Method for monitoring two-phase grounding fault of magnetic levitation stator coil - Google Patents

Method for monitoring two-phase grounding fault of magnetic levitation stator coil Download PDF

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CN102279338A
CN102279338A CN2011101100018A CN201110110001A CN102279338A CN 102279338 A CN102279338 A CN 102279338A CN 2011101100018 A CN2011101100018 A CN 2011101100018A CN 201110110001 A CN201110110001 A CN 201110110001A CN 102279338 A CN102279338 A CN 102279338A
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phase
branch road
current
stator
monitoring
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CN102279338B (en
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徐习东
杜鹏程
金宇
方华
王霄桦
许铁峰
徐涛
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Tongji University
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Shanghai Maglev Transportation Engineering Technology Research Center
Shanghai Maglev Transportation Development Co Ltd
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Abstract

The invention relates to a method for monitoring a two-phase grounding fault of a magnetic levitation stator coil. The method comprises the following steps of: arranging a relay protection device which can be used for monitoring three-phase current on the star point side of a stator three-phase winding of each branch circuit to monitor phase current of each phase of winding on the star point side; and when equal current of any two phases and a large current magnitude are monitored, judging that the two-phase grounding fault occurs on a long stator branch circuit. The method can be applied to a high-speed magnetic levitation traffic system. Even though a certain branch circuit is disconnected from a power supply source due to a fault, a two-phase grounding fault can also be judged quickly by using induction current generated by a train in a stator when a magnetic levitation train passes through a failed stator coil, an alarm signal is sent, and braking of the train is controlled, so that safe running is ensured.

Description

The monitoring method of magnetic floating fixed subcoil generation double earthfault
Technical field
The present invention relates in a kind of magnetic-levitation train tractive power supply system, determine the monitoring method of induction machine stator coil generation double earthfault.
Background technology
The tractive power supply system of magnetic levitation track circuit generally is made of the radiation electric network with highway section cable, is connected with a plurality of branch roads above, and each branch road is connected with an end of attaching troops to a unit in a certain section long stator of magnetic levitation track circuit; The other end of long stator is connected to normal potential.In order to activate a certain section magnetic levitation track circuit, corresponding branch road is connected by switchyard and highway section cable.
When earth fault occurring, the method for ground connection direction will detect the no-voltage that is drawn by the phase voltage that is added on this branch road on existing a kind of definite magnetic levitation track circuit on the switchyard of monitored branch road, and the zero current that is drawn by corresponding phase current.Can investigate thoroughly the ground connection direction according to this no-voltage and zero current by producing a fault direction signal.
Also have the method for identification earth fault in a kind of radiation electric network now, this method is determined location of fault by a central control unit, and faulty component is disconnected by means of the given fault-signal of branch protection device that branch road is monitored.
Yet said method only under the situation that the power supply power supply is arranged, is used for failure judgement position and open failure highway section or branch road.And after fault branch disconnected from mains side, said method was no longer monitored the influence of fault branch to the train in travelling.Take into account present magnetic-levitation train by the traction of multichannel stator branch road, when 2 earth faults appearred in a certain stator branch road, as if the power supply that disconnects this fault branch via said method, train may continue to be advanced by other stator branch road tractions.In the case, this fault stator will produce fault current to train braking, make train be subjected to an athwartship moment, influence safe train operation.
Summary of the invention
The monitoring method that the purpose of this invention is to provide a kind of magnetic floating fixed subcoil generation double earthfault after fault branch disconnects from mains side, can continue to monitor 2 earth faults that take place on the branch road, guarantees safe train operation.
In order to achieve the above object, technical scheme of the present invention provides a kind of monitoring method of magnetic floating fixed subcoil generation double earthfault, and the branch road of a plurality of stator coils in the magnetic-levitation train tractive power supply system is monitored respectively, and described monitoring method comprises:
In the three-phase stator winding star point side of each branch road, installing can be monitored the protective relaying device of three-phase current, monitors the dominant frequency phase current of each phase winding of star point side stator;
When monitoring that any biphase current equates and joining ground-to-ground capacitance current, judge that double earthfault has taken place this branch road, and send alarm signal greater than this stator branch road one.
The three-phase dominant frequency phase current of remembering described protective relaying device monitoring is respectively
Figure 608432DEST_PATH_IMAGE001
,
Figure 601795DEST_PATH_IMAGE002
,
Figure 418442DEST_PATH_IMAGE003
The criterion that described any biphase current equates is: the amplitude of the difference of any two current vectors promptly satisfies with lower inequality less than the error of measurement links:
Figure 421033DEST_PATH_IMAGE004
In the formula,
Figure 757467DEST_PATH_IMAGE005
,
Figure 921732DEST_PATH_IMAGE006
Be respectively three-phase dominant frequency phase current
Figure 225675DEST_PATH_IMAGE001
,
Figure 579427DEST_PATH_IMAGE002
,
Figure 957318DEST_PATH_IMAGE003
In any two different electric currents, first setting valve
Figure 620381DEST_PATH_IMAGE007
Be the definite value of adjusting in advance, be the maximum error of measurement links generation.
Any phase current joins ground-to-ground greater than this stator branch road one, and the criterion of capacitance current is:
Figure 83723DEST_PATH_IMAGE008
In the formula, Be three-phase dominant frequency phase current
Figure 473565DEST_PATH_IMAGE001
,
Figure 307528DEST_PATH_IMAGE002
, In the amplitude of any phase current;
Second setting valve is according to the ground capacitance of three phase windings of described branch road
Figure 953722DEST_PATH_IMAGE010
, the described branch road predominant frequency of under normal circumstances powering
Figure 306205DEST_PATH_IMAGE011
, the no-load emf E that train operation produces on stator, and the safety factor of setting Calculate,
Figure 749005DEST_PATH_IMAGE013
Safety factor
Figure 435201DEST_PATH_IMAGE012
Value be:
Figure 455241DEST_PATH_IMAGE014
Perhaps, second setting valve
Figure 568691DEST_PATH_IMAGE015
Can also be according to the ground capacitance of three phase windings of described branch road
Figure 556238DEST_PATH_IMAGE010
, the described branch road predominant frequency of under normal circumstances powering
Figure 780546DEST_PATH_IMAGE011
, the maximal value of described branch road supply voltage
Figure 914812DEST_PATH_IMAGE016
Calculate, this second setting valve is
Figure 995901DEST_PATH_IMAGE017
Compared with prior art, the monitoring method of magnetic floating fixed subcoil generation double earthfault of the present invention, its advantage is: the present invention can be used for high-speed magnetic suspension traffic system, even hinder for some reason and after disconnecting with power supply at certain branch road, also can be when magnetic-levitation train operation and process fault stator coil, rapidly judge whether this branch road exists double earthfault, and needn't gather supply side on off state information.
Concrete, biphase current equates and when joining ground-to-ground capacitance current greater than this stator branch road one, judges that double earthfault has taken place this branch road arbitrarily in finding three-phase current.
When monitoring the double earthfault generation, to send alarm signal, and the central control system of notice magnetic suspension train traction power supply, stop train operation on this fault highway section to carry out line maintenance by central control system, or the control train guarantees the safe operation of train to travel than low velocity by the fault highway section.
Description of drawings
Fig. 1 is the scheme of installation of protective relaying device in the monitoring method of magnetic floating fixed subcoil generation double earthfault of the present invention;
Fig. 2 is the logic diagram that the monitoring method of magnetic floating fixed subcoil generation double earthfault of the present invention is carried out fault judgement.
Embodiment
The monitoring method of magnetic floating fixed subcoil generation double earthfault of the present invention is particularly useful in the magnetic-levitation train tractive power supply system, the determining of the double earthfault that the stator coil of its induction motor is taken place.
Microcomputer protective relay device is the protective relaying device that extensively adopts at present, and it comprises analogue collection module, switch acquisition module, CPU (central processing unit), communication module, human-computer interface module etc. usually.
Cooperation is referring to Fig. 1, shown in Figure 2, at first as shown in Figure 1, in the star point side of protected branch road protective relaying device 1 is set, and its analogue collection module joins with threephase stator winding star point connecting line respectively by three current transformer 2A, 2B, 2C; Afterwards, judge according to logic diagram shown in Figure 2 whether this branch road double earthfault takes place.The process of the malfunction monitoring of A, B, C three phase windings is identical, and with A phase, B earth fault taking place mutually in the literary composition is that example describes.
Concrete, protective relaying device 1 is measured three-phase dominant frequency phase current, is designated as
Figure 408428DEST_PATH_IMAGE001
,
Figure 249476DEST_PATH_IMAGE002
,
Figure 493375DEST_PATH_IMAGE018
When this stator branch road was connected with mains side, under the normal condition, three-phase current was a forward-order current, that is: amplitude equates, angle differs 120 °, and the biphase current difference is bigger arbitrarily, as A, B biphase current difference greater than first setting valve
Figure 948627DEST_PATH_IMAGE019
, that is:
Figure 395920DEST_PATH_IMAGE020
, do not satisfy failure criterion.Described first setting valve
Figure 962031DEST_PATH_IMAGE019
Be the definite value of adjusting in advance, be the maximum error of measurement links generation.
When one point earth appearred in this stator branch road, as A phase ground connection, existing resist technology can be connected the stator branch road with power supply switch disconnected, and this moment, through this stator branch road, three-phase current was zero as if no train,
Figure 326016DEST_PATH_IMAGE001
=
Figure 952170DEST_PATH_IMAGE002
=
Figure 886759DEST_PATH_IMAGE018
=0, do not satisfy failure criterion
Figure 256560DEST_PATH_IMAGE021
If train is arranged through out-of-date, and have only A phase one point earth, then earth point will flow through whole electric currents of this stator branch road, that is:
Figure 475052DEST_PATH_IMAGE022
Can on the following formula basis, set safety factor k(1＜k＜10) obtain second setting valve of phase current
Figure 272107DEST_PATH_IMAGE013
, in the formula
Figure 693992DEST_PATH_IMAGE010
For the ground capacitance of three phase windings of described branch road,
Figure 601905DEST_PATH_IMAGE011
Be the described branch road predominant frequency of under normal circumstances powering,
Figure 674903DEST_PATH_IMAGE023
The no-load emf that on stator, produces for train operation.Because that phase current maximum of one point earth is no more than
Figure 642859DEST_PATH_IMAGE022
, also owing to be that second setting valve has been set safety factor, so can not satisfy during ground connection on one point
Figure 552040DEST_PATH_IMAGE021
So, the alarm signal that can by mistake not send out 2 ground connection heterogeneous.
When no-load emf E is difficult to obtain, can also be with the maximal value of described branch road supply voltage
Figure 263644DEST_PATH_IMAGE016
Substitute no-load emf E, needn't consider safety factor this moment again, and second setting valve of acquisition is
Failure condition as the concrete monitoring of the method for the invention, if on this stator branch road A, B double earthfault have taken place further, and short-circuit current will appear in A, B two-phase when train is arranged through this stator branch road this moment, and current value is far longer than the capacitance current of one point earth , and
Figure 726484DEST_PATH_IMAGE001
=
Figure 241779DEST_PATH_IMAGE002
, promptly satisfy
Figure 23790DEST_PATH_IMAGE024
, simultaneously
Figure 333549DEST_PATH_IMAGE021
, can judge in view of the above the AB double earthfault has taken place.
In sum, the monitoring method of magnetic floating fixed subcoil generation double earthfault of the present invention, can be used for high-speed magnetic suspension traffic system, even hinder for some reason and after disconnecting with power supply at certain branch road, also can when magnetic-levitation train operation and process fault stator coil, judge rapidly whether this branch road exists double earthfault.
Concrete, when monitoring that any biphase current equates and joining ground-to-ground capacitance current, judge that double earthfault has taken place this long stator branch road greater than this stator branch road one.
When monitoring the double earthfault generation, to send alarm signal, and notice is the central control system of magnetic suspension train traction power supply, stop train operation on this fault highway section to carry out line maintenance by central control system, or the control train guarantees the safe operation of train to travel than low velocity by the fault highway section.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (5)

1. the monitoring method of a magnetic floating fixed subcoil generation double earthfault is monitored respectively the branch road of a plurality of stator coils in the magnetic-levitation train tractive power supply system, it is characterized in that described monitoring method comprises:
In the three-phase stator winding star point side of each branch road, installing can be monitored the protective relaying device (1) of three-phase current, monitors the dominant frequency phase current of each phase winding of star point side stator;
When monitoring that any biphase current equates and joining ground-to-ground capacitance current, judge that double earthfault has taken place this branch road, and send alarm signal greater than this stator branch road one.
2. the monitoring method of magnetic floating fixed subcoil generation double earthfault according to claim 1 is characterized in that, remembers that the three-phase dominant frequency phase current of described protective relaying device (1) monitoring is respectively
Figure 2011101100018100001DEST_PATH_IMAGE001
, ,
Figure 2011101100018100001DEST_PATH_IMAGE003
The criterion that described any biphase current equates is: the amplitude of the difference of any two current vectors promptly satisfies with lower inequality less than the error of measurement links:
Figure 2011101100018100001DEST_PATH_IMAGE004
In the formula,
Figure 2011101100018100001DEST_PATH_IMAGE005
,
Figure 2011101100018100001DEST_PATH_IMAGE006
Be respectively three-phase dominant frequency phase current ,
Figure 311027DEST_PATH_IMAGE002
,
Figure 796498DEST_PATH_IMAGE003
In any two different electric currents, first setting valve
Figure 2011101100018100001DEST_PATH_IMAGE007
Be the definite value of adjusting in advance, be the maximum error of measurement links generation.
3. the monitoring method of magnetic floating fixed subcoil generation double earthfault according to claim 1 is characterized in that, any phase current joins ground-to-ground greater than this stator branch road one that the criterion of capacitance current is:
Figure 2011101100018100001DEST_PATH_IMAGE008
In the formula,
Figure 2011101100018100001DEST_PATH_IMAGE009
Be three-phase dominant frequency phase current
Figure 218383DEST_PATH_IMAGE001
,
Figure 454192DEST_PATH_IMAGE002
,
Figure 90972DEST_PATH_IMAGE003
In the amplitude of any phase current;
Second setting valve
Figure 2011101100018100001DEST_PATH_IMAGE010
, according to the ground capacitance of three phase windings of described branch road , the described branch road predominant frequency of under normal circumstances powering
Figure 2011101100018100001DEST_PATH_IMAGE012
, the no-load emf E that train operation produces on stator, and the safety factor of setting
Figure 2011101100018100001DEST_PATH_IMAGE013
Calculate,
Figure 2011101100018100001DEST_PATH_IMAGE014
4. as the monitoring method of magnetic floating fixed subcoil generation double earthfault as described in the claim 3, it is characterized in that safety factor
Figure 866118DEST_PATH_IMAGE013
Value be:
Figure 2011101100018100001DEST_PATH_IMAGE015
5. as the monitoring method of magnetic floating fixed subcoil generation double earthfault as described in the claim 3, it is characterized in that second setting valve
Figure 650666DEST_PATH_IMAGE010
Ground capacitance according to three phase windings of described branch road , the described branch road predominant frequency of under normal circumstances powering , the maximal value of described branch road supply voltage
Figure 2011101100018100001DEST_PATH_IMAGE016
Calculate, this second setting valve is
Figure 2011101100018100001DEST_PATH_IMAGE017
CN 201110110001 2011-04-29 2011-04-29 Method for monitoring two-phase grounding fault of magnetic levitation stator coil Expired - Fee Related CN102279338B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106443331A (en) * 2016-09-08 2017-02-22 中铁第四勘察设计院集团有限公司 Pulse method based feed catenary fault locating system
CN110618343A (en) * 2019-09-30 2019-12-27 广西桂冠电力股份有限公司 Device and method for searching generator stator bar ground fault point
CN114217181A (en) * 2021-11-25 2022-03-22 广东电网有限责任公司广州供电局 GIS cable sleeve test window

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Publication number Priority date Publication date Assignee Title
CN1351773A (en) * 1999-05-24 2002-05-29 Abb电力自动化有限公司 Electrical machine winding ground-fault protection system
CN1361569A (en) * 2000-12-29 2002-07-31 穆大庆 Single-phase earthing protection method for small current earthing system
CN1933270A (en) * 2006-01-26 2007-03-21 天津大学 Transmission line distance protecting method
JP2009077562A (en) * 2007-09-21 2009-04-09 Chugoku Electric Power Co Inc:The Two-phase bushing current transformer and protective relay device
CN101593971A (en) * 2009-04-22 2009-12-02 北京四方继保自动化股份有限公司 A kind of guard method based on failure resonant frequency
CN102005738A (en) * 2010-12-15 2011-04-06 国网电力科学研究院 Method for identifying healthy phase saturation based on current amplitude ratio and differential current harmonic wave

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1351773A (en) * 1999-05-24 2002-05-29 Abb电力自动化有限公司 Electrical machine winding ground-fault protection system
CN1361569A (en) * 2000-12-29 2002-07-31 穆大庆 Single-phase earthing protection method for small current earthing system
CN1933270A (en) * 2006-01-26 2007-03-21 天津大学 Transmission line distance protecting method
JP2009077562A (en) * 2007-09-21 2009-04-09 Chugoku Electric Power Co Inc:The Two-phase bushing current transformer and protective relay device
CN101593971A (en) * 2009-04-22 2009-12-02 北京四方继保自动化股份有限公司 A kind of guard method based on failure resonant frequency
CN102005738A (en) * 2010-12-15 2011-04-06 国网电力科学研究院 Method for identifying healthy phase saturation based on current amplitude ratio and differential current harmonic wave

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106443331A (en) * 2016-09-08 2017-02-22 中铁第四勘察设计院集团有限公司 Pulse method based feed catenary fault locating system
CN106443331B (en) * 2016-09-08 2019-03-05 中铁第四勘察设计院集团有限公司 Feed contact net fault location system based on impulse method
CN110618343A (en) * 2019-09-30 2019-12-27 广西桂冠电力股份有限公司 Device and method for searching generator stator bar ground fault point
CN114217181A (en) * 2021-11-25 2022-03-22 广东电网有限责任公司广州供电局 GIS cable sleeve test window
CN114217181B (en) * 2021-11-25 2024-04-12 广东电网有限责任公司广州供电局 GIS cable sleeve test window

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