CN108957242A - The contact net fault identification devices and methods therefor of power supply system of electrified railway - Google Patents
The contact net fault identification devices and methods therefor of power supply system of electrified railway Download PDFInfo
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- CN108957242A CN108957242A CN201810972889.8A CN201810972889A CN108957242A CN 108957242 A CN108957242 A CN 108957242A CN 201810972889 A CN201810972889 A CN 201810972889A CN 108957242 A CN108957242 A CN 108957242A
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- contact net
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention discloses a kind of contact net fault identification devices and methods therefors of power supply system of electrified railway, belong to attached wires of AC electrified railway traction power supply observation and control technology field.The fault identification device input terminal respectively be arranged in parallel voltage transformer locating for the intermediate AT between contact net and rail, left neighbour AT institute, centre AT and right neighbour AT test lead connect, output end respectively with left neighbour AT institute, centre AT and right neighbour AT control terminal connect；Wherein, the intermediate AT control terminal include be parallel to contact net locating for the intermediate AT bypass short-circuiting device control terminal.Therefore, the present invention not only can timely and accurately have found, distinguish, various contact net failures are isolated and demarcating the specific location of failure, also ensure that fault-free section continues powered operation, scope of power outage is reduced to the maximum extent, the extension for avoiding failure from influencing further increases the reliability of Traction networks power supply.
Description
Technical field
The invention belongs to attached wires of AC electrified railway traction power supply observation and control technology fields.
Background technique
The AT power supply mode of electric railway has stronger power supply capacity and longer power supply compared to direct feeding system
Arm lengths, it is possible to reduce electric split-phase and non-Electric region, therefore, China's high-speed rail have nearly all selected AT power supply mode.
But China mountain range, river are numerous, this often causes to be stranded to the nearest setting of the be in contact with it net sectionaliser of AT
Difficulty, or even must pull open very long distance, some are up to 2km, this just need make to set up between AT institute and its sectionaliser it is very long
Supply lines.AT supply lines and contact net between its sectionaliser length it is bigger, inductance is bigger, and electrification train is logical
When crossing sectionaliser, unexpected conversion of the train electric current between this section of supply lines and contact net will cause overvoltage and arcing, arcing
Meeting scaling loss contact line, or even contact line is blown, it leads to a disaster.
Obviously, technical problem urgently to be solved is now: under accidental conditions, eliminate train by distance AT institute compared with
Phenomenon of arc discharge when remote sectionaliser, and when contact net breaks down, then it should distinguish in time and accurately inside and outside supply lines range
Failure occurs section and its specific location and cuts off failure.
Summary of the invention
The object of the present invention is to provide a kind of contact net fault identification device of power supply system of electrified railway and its sides
Method can not only efficiently solve and accurately be distinguish technical problem in time when contact net breaks down, and can also cut off
And it carries out abort situation and accurately identifies.
In order to solve the above-mentioned technical problems, the present invention provides following technical solutions are as follows:
A kind of contact net fault identification device of power supply system of electrified railway, the power supply system of electrified railway
Including contact net and rail and at least three AT institute, with section carried out by three AT, respectively left neighbour AT institute, centre AT institute and right neighbour
AT institute, the setting of fault identification device in intermediate AT institute, the input terminal of the fault identification device respectively be arranged in parallel in intermediate AT
Contact net and rail between voltage transformer one, voltage transformer two, left neighbour AT institute, centre AT and right neighbour AT
Test lead connection, output end respectively with left neighbour AT institute, centre AT and right neighbour AT control terminal connect；Wherein, in described
Between AT control terminal include be parallel to contact net locating for the intermediate AT bypass short-circuiting device control terminal.
The intermediate AT test lead include the first current transformer, the second current transformer and with the second upper left
The concatenated third current transformer of net breaker and test lead with the second concatenated 4th current transformer of upper right net breaker；
Wherein, the left end connection of the bypass breaker of one end series connection with it of first current transformer, the other end pass through on first
Cable is connected on the contact net of two left end of sectionaliser；The bypass breaker of one end series connection with it of second current transformer
Right end connection, the other end is connected on the contact net of two right end of sectionaliser by cable on second.
The intermediate AT control terminal include the second upper left net breaker and the second upper right net breaker test lead；In
Between the contact net terminal that becomes of AT institute's self coupling sectionaliser two is connected to by the second upper left net breaker and the second upper left cable nearby
On the contact net of left end, referred to herein as intermediate AT institute's self coupling becomes upper left site；The contact net terminal that intermediate AT institute's self coupling becomes passes through
Second upper right net breaker and supply lines are connected on the contact net of two right end of sectionaliser, and referred to herein as intermediate AT institute's self coupling becomes
Upper right site.
The left neighbour AT test lead be the 5th current transformer test lead, the left neighbour AT control terminal be the
The control terminal of one upper left net breaker and the first upper right net breaker, wherein one end of the first upper left net breaker passes through
First upper left cable is connect nearby with the contact net of one left end of sectionaliser, the contact net terminal that the other end and left neighbour's AT institute's self coupling become
Connection；One end of the first upper right net breaker is connected nearby by the contact net of the first upper right cable and one right end of sectionaliser
It connects, the other end is connect by the 5th current transformer of series connection with it with the contact net terminal that left neighbour's AT institute's self coupling becomes.
The right neighbour AT test lead be the 6th current transformer test lead, right neighbour AT control terminal be respectively the
The control terminal of three upper left net breakers and third upper right net breaker, wherein one end of third upper left net breaker by with its
Concatenated 6th current transformer is connect with the contact net terminal that right neighbour's AT institute's self coupling becomes, the other end by third upper left cable with
The contact net of three left end of sectionaliser connects；The contact net end that one end of the third upper right net breaker and right neighbour's AT institute's self coupling become
Son connection, the other end are connect by third upper right cable with the contact net of three right end of sectionaliser.
In order to solve the above-mentioned technical problem, invention further provides following technical solutions are as follows: a kind of electric railway AT confession
The contact net fault recognition method of electric system, specific step is as follows for the contact net fault recognition method:
The size relation of voltage value and state threshold that comparison voltage mutual inductor one or voltage transformer two measure；
If the voltage that voltage transformer one or voltage transformer two measure is lower than state threshold, electric railway AT is supplied
There are failures for the contact net of electric system；If the voltage that voltage transformer one or voltage transformer two measure is equal to or more than state
Threshold value, then the contact net working condition of power supply system of electrified railway is normal.
It is when the voltage that voltage transformer one or voltage transformer two measure is lower than state threshold, then intermediate according to calculating
AT the first current transformer and third current transformer the sum of current value and left neighbour AT current transformer electric current
Then the absolute value of difference between value compares whether the absolute value is greater than maximum imbalance current value again, if more than then in identification
Between the institute upper left site AT and left neighbour AT between contact net or the centre institute upper left site AT and sectionaliser two between contact net
Short circuit occurs, at this point, fault identification device order the second upper left net breaker and bypass breaker tripping.
It is tripped the voltage value that previous transient voltage mutual inductor one measures using the second upper left net breaker and bypass breaker
The current value measured with the first current transformer calculates short-circuit impedance and is converted into equivalent contact net length D to carry out fault bit
Set identification: when equivalent contact net length D is less than the practical contact net length between the intermediate institute upper left site AT and sectionaliser two,
Assert that failure occurs in the contact net between the intermediate institute upper left site AT and sectionaliser two, otherwise, assert that failure occurs in
Between the institute upper left site AT and left neighbour AT between contact net in.
When the voltage that voltage transformer one or voltage transformer two measure is lower than state threshold, then intermediate AT institute is calculated
The second current transformer and the 4th current transformer the sum of current value and right neighbour AT current transformer current value it
Between difference absolute value, then compare whether the absolute value is greater than maximum imbalance current value again；It is then to assert two He of sectionaliser
Right neighbour AT between contact net occur short circuit, at this point, fault identification device order the second upper right net breaker and bypass open circuit
Device tripping.
It is tripped the voltage value that previous transient voltage mutual inductor one measures using the second upper right net breaker and bypass breaker
The current value measured with the second current transformer calculates short-circuit impedance and is converted into equivalent contact net length D to carry out abort situation
Identification: when equivalent contact net length D is less than the practical contact net length between the intermediate institute's upper right site AT and sectionaliser two, recognize
Determine in the contact net that failure occurs between the intermediate institute's upper right site AT and sectionaliser two, otherwise, assert that failure occurs in centre
The institute's upper right site AT and right neighbour AT between contact net in.
Compared with prior art, beneficial effects of the present invention mainly use for technical solutions according to the invention and judge in
Between AT contact net T and rail R between voltage transformer and state threshold size, obtain contact net with the presence or absence of failure；
In conjunction with three AT the current transformer comparisons of size of current that measure of three branches judge that section occurs for failure, with
And using AT voltage and correlated current calculate contact net impedance and be further converted into length and demarcate the specific position of failure
It sets, therefore, the present invention can not only have found accurately and in time, distinguish, various contact net failures are isolated and demarcate the specific of failure
Position, moreover it is possible to guarantee that fault-free section continues power supply, operation, reduce scope of power outage to the maximum extent, the expansion for avoiding failure from influencing
Bigization further increases the reliability of Traction networks power supply；The relevant apparatus investment being related to simultaneously is less, easy to implement, is both convenient for
New line uses, and is also convenient for old line transformation.
Detailed description of the invention
Fig. 1 is one power supply system of electrified railway schematic diagram of the embodiment of the present invention.
Fig. 2 is the input of one fault identification device of the embodiment of the present invention, output relation figure.
Fig. 3 is the flow chart of two fault recognition method of the embodiment of the present invention.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention
Applying example, the present invention is described in further detail.
The working principle of the invention is: bypass breaker is in parallel with sectionaliser, and when normal operation, bypass breaker closes a floodgate,
Sectionaliser is bypassed, while the upper cable of bypass breaker keeps most short, then makes the inductance L of shunt circuit conducting wire minimum, train
Transient voltage Ldi/dt when belt current i passes through sectionaliser reaches minimum, or even close to 0, makes train electric current i successfully from segmentation
One end of device is transferred to the other end, to eliminate arcing condition.Under fault condition, measured using the current transformer of three branches
Size of current comparison come judge failure occur section, recycle AT institute voltage and correlated current calculating contact net impedance simultaneously
It is converted into length further to demarcate the specific location of failure.
Embodiment one
According to Fig. 1 and Fig. 2, the embodiment of the invention provides a kind of events of the contact net of power supply system of electrified railway
Hinder identification device, the power supply system of electrified railway includes at least three AT institutes, contact net T and rail R, wherein with three
Section carried out by AT, three AT are respectively that left neighbour AT institute, centre AT institute and right neighbour AT institute, fault identification device are arranged in
Between AT institute, the input terminal of the fault identification device respectively be arranged in parallel the contact net T locating for the intermediate AT and rail R it
Between one YHa of voltage transformer, be arranged in parallel voltage transformer locating for the intermediate AT between contact net T and rail R
Two YHb, left neighbour AT institute, centre AT with right neighbour AT test lead connect, output end respectively with left neighbour AT institute, centre AT institute
With right neighbour AT control terminal connect；Wherein, the intermediate AT control terminal include being parallel to locating for the intermediate AT to connect
The control terminal of the bypass short-circuiting device PD of net-fault T.
The another embodiment of the present invention preferably, the intermediate AT test lead include the first current transformer LH1, the
Two current transformer LH2, with the concatenated third current transformer LH21 of the second upper left net breaker DL21 and with second the right side
The test lead of online the 4th current transformer LH23 of breaker DL23；Wherein, described one end first current transformer LH1 is gone here and there with it
The left end of the bypass breaker PD of connection connects, and the first current transformer LH1 other end is connected to by cable SW1 on first
On the contact net T of two left end FD2 of sectionaliser；The right side of second current transformer LH2 one end series connection with it bypass breaker PD
End connection, the second current transformer LH2 other end are connected to connecing for two FD2 right end of sectionaliser by cable SW2 on second
On net-fault T.
The another embodiment of the present invention preferably, the intermediate AT control terminal further include the second upper left net breaker
The test lead of DL21 and the second upper right net breaker DL23, the intermediate AT breaker be divided into the second upper left net breaker
DL21 and the second upper right net breaker DL23；The contact net terminal that intermediate AT institute's self coupling becomes AT2 passes through the second upper left net breaker
DL21 and the second upper left cable SW21 are connected to nearby on the contact net T of two left end FD2 of sectionaliser, and referred to herein as intermediate AT institute is certainly
Coupling becomes the upper left AT2 site Z；The contact net terminal that intermediate AT institute's self coupling becomes AT2 passes through the second upper right net breaker DL23 and power supply
Line GD is connected on the contact net T of two FD2 right end of sectionaliser, and referred to herein as intermediate AT institute's self coupling becomes AT2 upper right site, is denoted as
Y。
The another embodiment of the present invention preferably, the left neighbour AT test lead be the 5th current transformer LH12 survey
Try end, the left neighbour AT control terminal for the first upper left net breaker DL10 and the first upper right net breaker DL12 control
End, wherein the first upper left net one end breaker DL10 is connect by the first upper left cable SW10 and one left end FD1 of sectionaliser
Net-fault T is connected nearby, and the contact net terminal of the first upper left net breaker DL10 other end and left neighbour's AT institute's self coupling change AT1 connect
It connects；First upper right net one end breaker DL12 passes through the contact net T of the first upper right cable SW10 and one FD1 right end of sectionaliser
Connection nearby, the 5th current transformer LH12 and left neighbour that the first upper right net breaker DL10 other end passes through series connection with it
AT institute's self coupling becomes the contact net terminal connection of AT1.
The another embodiment of the present invention preferably, the right neighbour AT test lead be the 6th current transformer LH32 survey
Try end, the right neighbour AT control terminal be respectively third upper left breaker DL32 and third upper right breaker DL34 control
End, wherein sixth current transformer LH32 and right neighbour AT institute of the described third upper left one end breaker DL32 by series connection with it
Self coupling become AT3 contact net terminal connection, the third upper left breaker DL32 other end by third upper left cable SW32 with
The contact net T connection of three left end FD3 of sectionaliser；Described third upper right one end breaker DL34 and right neighbour's AT institute's self coupling become AT3's
The connection of contact net terminal, the third upper right breaker DL34 other end pass through third upper right cable SW34 and three FD3 of sectionaliser
The contact net T connection of right end.
In order to be best understood from the embodiment of the present invention, it is described in detail as follows: continues below as shown in Figure 1, the present invention is implemented
Example described in contact net fault identification device, with section carried out by three AT, bit selecting in left neighbour AT institute, right neighbour AT between centre
AT institute, the intermediate AT institute and contact net T, rail R, negative feeder F and left neighbour AT institute, the collectively constituted electric railway AT of right neighbour AT
Power supply system；The contact net terminal that left neighbour's AT institute's self coupling becomes AT1 passes through the first upper left net breaker DL10 and the first upper left cable
SW10 is connected to nearby on the contact net T of one left end FD1 of sectionaliser, and left neighbour's AT institute's self coupling becomes the contact net terminal of AT1 by the
One upper right net breaker DL12 and the first upper right cable SW12 are connected to nearby on the contact net T of one FD1 right end of sectionaliser, segmentation
One FD1 of device is serially connected in left neighbour's AT institute's self coupling and becomes in the contact net T beside AT1；The contact net terminal that right neighbour's AT institute's self coupling becomes AT3 is logical
It crosses third upper left net breaker DL32 and third upper left cable SW32 is connected to nearby on the contact net T of three left end FD3 of sectionaliser,
The contact net terminal that right neighbour's AT institute's self coupling becomes AT3 is connected nearby by third upper right net breaker DL34 and third upper right cable SW34
It is connected on the contact net T of three FD3 right end of sectionaliser, three FD3 of sectionaliser is serially connected in the contact net beside right neighbour's AT institute's self coupling change AT3
In T；The contact net terminal that intermediate AT institute's self coupling becomes AT2 passes through the second upper left net breaker DL21 and the second upper left cable SW21 just
It is closely connected on the contact net T of two left end FD2 of sectionaliser, referred to herein as intermediate AT institute's self coupling becomes the upper left AT2 site Z, intermediate AT
The contact net terminal that institute's self coupling becomes AT2 is connected to the right side two FD2 of sectionaliser by the second upper right net breaker DL23 and supply lines GD
On the contact net T at end, referred to herein as intermediate AT institute's self coupling becomes AT2 upper right site Y；One FD1 of sectionaliser, two FD2 of sectionaliser and point
Section three FD3 of device can be such that train does not power off to pass through；LH12 is denoted as with the first concatenated current transformer of upper right net breaker DL12；
It is denoted as LH21 with the second upper left concatenated current transformer of net breaker DL21, with the second concatenated electricity of upper right net breaker DL23
Current transformer is denoted as LH23；LH32 is denoted as with the third upper left concatenated current transformer of net breaker DL32；Intermediate AT is contacted
Voltage transformer one in parallel is denoted as YHa between net T and rail R；Bypass breaker PD is set at two FD2 of sectionaliser, and bypass is disconnected
One end of road device PD is connected to sectionaliser two by cable SW1 on the first current transformer LH1 and first connected in series nearby
On the contact net T of the left end FD2, the other end of bypass breaker PD passes through the second current transformer LH2 and second connected in series
Upper cable SW2 is connected to nearby on the contact net T of two FD2 right end of sectionaliser, i.e., intermediate AT institute's self coupling becomes on AT2 upper right site Y,
Between Y and rail R and voltage transformer two is connect, is denoted as YHb.
According to Fig.2, fault identification device input terminal connection one YHa of voltage transformer, two YHb of voltage transformer and
5th current transformer LH12, third current transformer LH21, the first current transformer LH1, the second current transformer LH2 and
The measurement end of 4th current transformer LH23 and the 6th current transformer LH32, output end connect intermediate AT institute's self coupling and become AT2
The second upper left net breaker DL21, the second upper right net breaker DL23, bypass breaker PD and left neighbour's AT institute's self coupling become AT1
First upper right net breaker DL12 and right neighbour's AT institute's self coupling become the control terminal of AT3 third upper left net breaker DL32.
Identification device described in the embodiment of the present invention mainly uses and three AT institutes (i.e. left neighbour AT institute, centre AT institute and the right side
Adjacent AT institute) the test leads of three branch roads connected with control terminal, thus big by the electric current that three branch current mutual inductor measurings obtain
Small comparison judges that section occurs for failure, and voltage and correlated current calculating contact net impedance and further using AT institute
Length is converted into demarcate the specific location of failure, therefore, the present invention can not only have found accurately and in time, distinguish, being isolated respectively
Kind contact net failure and the specific location for demarcating failure, moreover it is possible to guarantee that fault-free section continues power supply, operation, subtract to the maximum extent
Few scope of power outage, the extension for avoiding failure from influencing further increase the reliability of Traction networks power supply；The related dress being related to simultaneously
It is less to set investment, it is easy to implement, it was both used convenient for new line, and was also convenient for old line transformation.
Embodiment two
According to Fig.3, the embodiment of the invention provides a kind of knowledges of the contact net failure of power supply system of electrified railway
Other method, specific step is as follows for the contact net fault recognition method:
The size for the voltage value and state threshold that one YHa of comparison voltage mutual inductor or two YHb of voltage transformer are measured is closed
System；
If the voltage that one YHa of voltage transformer or two YHb of voltage transformer are measured is lower than state threshold, electrified iron
There are failures for the contact net of road AT power supply system；If the voltage etc. that one YHa of voltage transformer or two YHb of voltage transformer are measured
In or greater than state threshold, then failure is not present in the contact net of power supply system of electrified railway.In embodiments of the present invention, institute
It states state threshold and refers to contact net voltage drop as low as the voltage value for making train cisco unity malfunction, existing motor-car takes 16.6kV.Separately
Outside, maximum imbalance current described in the embodiment of the present invention is by contact net unevenness, distribution capacity and current transformer
Caused by measurement error etc., usual very little, close to 0.
The another embodiment of the present invention preferably, when the voltage that voltage transformer YHa or YHb are measured is lower than state threshold
When, then according to calculate intermediate AT the first current transformer LH1 and third current transformer LH21 the sum of current value and a left side
Adjacent AT current transformer LH12 current value between difference absolute value, then compare whether the absolute value is greater than maximum again
Out-of-balance current value, if more than, then assert intermediate AT institute site Z and left neighbour AT between contact net or centre AT institute site Z
Short circuit occurs for the contact net between two FD2 of sectionaliser, at this point, the second upper left of abort situation identification device order net breaker
DL21 and bypass breaker PD tripping.
The another embodiment of the present invention preferably, before the second upper left net breaker DL21 and bypass breaker PD tripping
The current value that the voltage value and the first current transformer LH1 that two YHb of voltage transformer is measured in a flash measure calculates short-circuit impedance
And equivalent contact net length D is converted into carry out abort situation identification: when equivalent contact net length D is less than intermediate AT institute upper left net
When practical contact net length between two FD2 of point Z and sectionaliser, assert that failure occurs in the intermediate institute upper left AT site Z and segmentation
In contact net T between two FD2 of device, otherwise, assert failure occur the intermediate institute upper left AT site Z and left neighbour AT between connect
In net-fault T.
Specifically, when the voltage that one YHa of voltage transformer or two YHb of voltage transformer are measured is lower than state threshold,
Then calculate intermediate AT the second current transformer LH2 and the 4th current transformer LH23 the sum of current value and right neighbour AT
The absolute value of difference between the current value of current transformer LH32, then compares whether the absolute value is greater than maximum uneven electricity again
Flow valuve, then assert two FD2 of sectionaliser and right neighbour AT between contact net occur short circuit, at this point, abort situation identification device order
The second upper right net breaker DL23 and bypass breaker PD is enabled to trip.
The another embodiment of the present invention preferably, before the second upper right net breaker DL23 and bypass breaker PD tripping
The current value that the voltage value and the second current transformer LH2 that one YHa of voltage transformer is measured in a flash measure calculates short-circuit impedance
And equivalent contact net length D is converted into carry out abort situation identification: when equivalent contact net length D is less than intermediate AT institute site Y
When practical contact net length between two FD2 of sectionaliser, assert that failure occurs in intermediate AT institute's upper right site Y and sectionaliser two
In contact net T between FD2, otherwise, assert failure occur intermediate AT institute's upper right site Y and right neighbour AT between contact net
In T.
In order to be best understood from the embodiment of the present invention, the specific step of contact net fault recognition method described in the embodiment of the present invention
Suddenly it is briefly described as follows: when the voltage that one YHa of voltage transformer or two YHb of voltage transformer are measured is lower than state threshold,
(1) if the sum of electric current that third current transformer LH21, the first current transformer LH1 are measured and the 5th Current Mutual Inductance
The absolute value of the difference for the electric current that device LH12 is measured is greater than maximum imbalance current value, then assert intermediate AT institute site Z and left neighbour
AT between contact net or fixed intermediate the institute upper left AT site Z and sectionaliser FD2 between contact net short circuit occurs, at this point, therefore
Hinder the second upper left of position identification device order net breaker DL21 and bypass breaker PD tripping；Meanwhile utilizing the second upper left net
Breaker DL21 and bypass breaker PD trips the voltage value and the first current transformer that previous transient voltage mutual inductor YHb is measured
The current value that LH1 is measured calculates short-circuit impedance and is converted into equivalent contact net length D to carry out abort situation calibration: when D is less than
When practical contact net length between two FD2 of site Z and sectionaliser, assert that failure occurs in intermediate AT institute site Z and sectionaliser
On contact net between two FD2, otherwise, assert failure occur the intermediate institute upper left AT site Z and left neighbour AT between contact
On the net.
(2) if the sum of electric current that the 4th current transformer LH23, the second current transformer LH2 are measured and the 6th Current Mutual Inductance
The absolute value of the difference for the electric current that device LH32 is measured is greater than maximum imbalance current value, then assert two FD2 of sectionaliser and right neighbour AT
Between contact net short circuit occurs, at this point, abort situation identification device the second upper right of order net breaker DL23 and bypass are disconnected
Road device PD tripping；Meanwhile using right neighbour AT voltage and current carry out abort situation calibration.
Recognition methods described in the embodiment of the present invention mainly using judge intermediate AT contact net T and rail R between
Voltage transformer and state threshold size, obtain contact net with the presence or absence of failure；In conjunction with three AT three branches
The comparison for the size of current that current transformer measures judge failure occur section, and using AT voltage and correlated current
Calculate contact net impedance and be converted into length further to demarcate the specific location of failure, therefore, the present invention not only can it is timely,
It accurately finds, distinguish, various contact net failures are isolated and demarcating the specific location of failure, moreover it is possible to guarantee that fault-free section continues
Power supply, operation, reduce scope of power outage to the maximum extent, the extension for avoiding failure from influencing, and further increase Traction networks power supply
Reliability；The relevant apparatus investment being related to simultaneously is less, easy to implement, both uses convenient for new line, is also convenient for old line transformation.
Claims (10)
1. a kind of contact net fault identification device of power supply system of electrified railway, the power supply system of electrified railway packet
Include contact net (T) and rail (R) and at least three AT institute, with section carried out by three AT, respectively left neighbour AT institute, centre AT institute and
Right neighbour AT institute, it is characterised in that: the setting of fault identification device in intermediate AT institute, the end of the input of the fault identification device respectively with
Be arranged in parallel in intermediate AT contact net (T) and rail (R) between voltage transformer one (YHa), voltage transformer two
(YHb), left neighbour AT institute, centre AT with right neighbour AT test lead connect, output end respectively with left neighbour AT institute, centre AT institute
With right neighbour AT control terminal connect；Wherein, the intermediate AT control terminal include being parallel to locating for the intermediate AT to connect
The control terminal of the bypass short-circuiting device (PD) of net-fault (T).
2. the contact net fault identification device of power supply system of electrified railway according to claim 1, which is characterized in that
The intermediate AT test lead include the first current transformer (LH1), the second current transformer (LH2) and with second a left side
Surf the Internet breaker (DL21) concatenated third current transformer (LH21) and with the second upper right net breaker (DL23) concatenated the
The test lead of four current transformers (LH23)；Wherein, the bypass of one end series connection with it of first current transformer (LH1) is disconnected
The left end of road device (PD) connects, and the other end passes through the contact net that cable (SW1) on first is connected to the left end sectionaliser two (FD2)
(T) on；The right end of the bypass breaker (PD) of one end series connection with it of second current transformer (LH2) connects, the other end
It is connected on the contact net (T) of sectionaliser two (FD2) right end by cable (SW2) on second.
3. the contact net fault identification device of power supply system of electrified railway according to claim 1, which is characterized in that
The intermediate AT control terminal including the second upper left net breaker (DL21) and the second upper right net breaker (DL23) test
End；The contact net terminal that intermediate AT institute's self coupling becomes (AT2) passes through the second upper left net breaker (DL21) and the second upper left cable
(SW21) it is connected on the contact net (T) of the left end sectionaliser two (FD2) nearby, it is left that referred to herein as intermediate AT institute's self coupling becomes (AT2)
Upper site (Z)；The contact net terminal that intermediate AT institute's self coupling becomes (AT2) passes through the second upper right net breaker (DL23) and supply lines
(GD) it is connected on the contact net (T) of sectionaliser two (FD2) right end, referred to herein as intermediate AT institute's self coupling becomes (AT2) upper right net
Point (Y).
4. the contact net fault identification device of power supply system of electrified railway according to claim 1, which is characterized in that
The left neighbour AT test lead be the 5th current transformer (LH12) test lead, the left neighbour AT control terminal be first
The control terminal of upper left net breaker (DL10) and the first upper right net breaker (DL12), wherein the first upper left net breaker
(DL10) one end is connect by the first upper left cable (SW10) with the contact net (T) of the left end sectionaliser one (FD1) nearby, another
The contact net terminal for becoming (AT1) with left neighbour's AT institute's self coupling is held to connect；One end of the first upper right net breaker (DL12) passes through
First upper right cable (SW10) is connect nearby with the contact net (T) of sectionaliser one (FD1) right end, and the other end passes through series connection with it
5th current transformer (LH12) is connect with the contact net terminal that left neighbour's AT institute's self coupling becomes (AT1).
5. the contact net fault identification device of power supply system of electrified railway according to claim 1, which is characterized in that
The right neighbour AT test lead be the 6th current transformer (LH32) test lead, right neighbour AT control terminal be respectively third
The control terminal of upper left net breaker (DL32) and third upper right net breaker (DL34), wherein third upper left net breaker
(DL32) one end becomes the contact net end of (AT3) by the 6th current transformer (LH32) of series connection with it and right neighbour's AT institute's self coupling
Son connection, the other end are connect by third upper left cable (SW32) with the contact net (T) of the left end sectionaliser three (FD3)；Described
The contact net terminal that one end of three upper right net breakers (DL34) and right neighbour's AT institute's self coupling become (AT3) connect, and the other end passes through the
Three upper right cables (SW34) are connect with the contact net (T) of sectionaliser three (FD3) right end.
6. a kind of contact net fault recognition method of power supply system of electrified railway, which is characterized in that the contact net failure is known
Specific step is as follows for other method:
The size for the voltage value and state threshold that comparison voltage mutual inductor one (YHa) or voltage transformer two (YHb) measure is closed
System；
If the voltage that voltage transformer one (YHa) or voltage transformer two (YHb) measure is lower than state threshold, electrified iron
There are failures for the contact net of road AT power supply system；If the electricity that voltage transformer one (YHa) or voltage transformer two (YHb) measure
Pressure is equal to or more than state threshold, then the contact net working condition of power supply system of electrified railway is normal.
7. the contact net fault recognition method of power supply system of electrified railway according to claim 6, which is characterized in that
When the voltage that voltage transformer one (YHa) or voltage transformer two (YHb) measure is lower than state threshold, then according in calculating
Between AT the first current transformer (LH1) and third current transformer (LH21) the sum of current value and left neighbour AT electric current
The absolute value of difference between the current value of mutual inductor (LH12), then compares whether the absolute value is greater than maximum imbalance current again
Value, if more than, then assert the intermediate institute upper left AT site (Z) and left neighbour AT between contact net or the centre institute upper left AT site
(Z) short circuit occurs for the contact net between sectionaliser two (FD2), at this point, the second upper left of fault identification device order net breaker
(DL21) it trips with bypass breaker (PD).
8. the contact net fault recognition method of power supply system of electrified railway according to claim 7, it is characterised in that:
The voltage measured using the second upper left net breaker (DL21) and the previous transient voltage mutual inductor YHb of bypass breaker (PD) tripping
The current value that value and the first current transformer (LH1) measure calculates short-circuit impedance and is converted into equivalent contact net length D to carry out
Abort situation identification: when equivalent contact net length D is less than the reality between the intermediate institute upper left AT site (Z) and sectionaliser two (FD2)
When the contact net length of border, assert that the contact net between the intermediate institute upper left AT site (Z) and sectionaliser two (FD2) occurs for failure
(T) in, otherwise, assert failure occur the intermediate institute upper left AT site (Z) and left neighbour AT between contact net (T) it is interior.
9. the contact net fault recognition method of power supply system of electrified railway according to claim 7, it is characterised in that:
When the voltage that voltage transformer one (YHa) or voltage transformer two (YHb) measure is lower than state threshold, then intermediate AT is calculated
The second current transformer (LH2) and the 4th current transformer (LH23) the sum of current value and right neighbour AT Current Mutual Inductance
The absolute value of difference between the current value of device (LH32), then compares whether the absolute value is greater than maximum imbalance current value again；
Then assert sectionaliser two (FD2) and right neighbour AT between contact net short circuit occurs, at this point, fault identification device order second is right
It surfs the Internet breaker (DL23) and bypass breaker (PD) trips.
10. the contact net fault recognition method of power supply system of electrified railway according to claim 9, feature exist
In: it is measured using the second upper right net breaker (DL23) and the previous transient voltage mutual inductor (YHa) of bypass breaker (PD) tripping
Voltage value and the current value that measures of the second current transformer (LH2) calculate short-circuit impedance and be converted into equivalent contact net length D
To carry out abort situation identification: when equivalent contact net length D be less than intermediate AT institute's upper right site (Y) and sectionaliser two (FD2) it
Between practical contact net length when, assert failure occur connecing between intermediate AT institute's upper right site (Y) and sectionaliser two (FD2)
Touch net in (T), otherwise, assert failure occur intermediate AT institute's upper right site (Y) and right neighbour AT between contact net (T) it is interior.
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