CN110244182B - Fault positioning method and system suitable for electrified railway multi-branch line - Google Patents
Fault positioning method and system suitable for electrified railway multi-branch line Download PDFInfo
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- CN110244182B CN110244182B CN201910575307.7A CN201910575307A CN110244182B CN 110244182 B CN110244182 B CN 110244182B CN 201910575307 A CN201910575307 A CN 201910575307A CN 110244182 B CN110244182 B CN 110244182B
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- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
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- 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
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a fault positioning method and a system suitable for multi-branch lines of an electrified railway, wherein local acquisition units are installed on the multi-branch lines of each branch line including a split-phase line and a junction station, the start judgment of the local acquisition units is carried out according to the line current and the line-to-ground electric field of the positions of the local acquisition units, the started local acquisition units acquire the fault current of the branch lines, and the fault current of the non-started local acquisition units is zero; according to the distribution characteristics of the fault current of each branch line, the position of the branch line where the fault point is located is determined, and the reactance method is adopted to accurately position the fault of the multi-branch line, so that a reliable basis is provided for fault maintenance of the branch line of the electrified railway, and the power supply recovery time is shortened.
Description
Technical Field
The invention relates to a fault positioning method and a system suitable for a multi-branch line of an electrified railway, and belongs to the technical field of traction power supply of the electrified railway.
Background
The special fault distance measuring device adopted in domestic high-speed railways and passenger dedicated lines at present aims at the non-bifurcated lines of contact networks on power supply arms, namely the fault distance measuring precision of single-line single-branch contact networks or double-line double-branch contact network lines is very high, the error is generally within the range of +/-500 meters, but the distance measuring precision is not high when a fault point occurs in a multi-branch junction station, and the position of the fault point can only be searched by adopting a manual inspection method. As shown in fig. 1, in some large terminal stations, because of the numerous branch tracks, the manual patrol method consumes a lot of manpower, and the time for finding the fault point is long, which undoubtedly prolongs the time for recovering the power supply, and is especially disadvantageous for guaranteeing the normal operation of the train. In addition, due to the constraints of site selection of the traction substation and the design of a contact network, the network points on the contact lines of some traction substations are not designed near the phase splitting points, the network points on the contact lines of the traction substations are far away from the phase splitting points of the lines, and when a short-circuit fault occurs between the network points and the phase splitting points, the conventional fault distance measuring device cannot distinguish whether the fault point is on the phase splitting line or the positive line, so that fault maintenance is influenced, and the time for recovering power supply is prolonged.
Therefore, it is necessary to provide a method for locating a fault of a branch line, which is suitable for actual working conditions on site, so as to accurately locate the position of the actual fault line. When the line breaks down, the branch contact network line that breaks down can be calibrated rapidly, and the effective quick accident rush repair is organized with a certain aim, handles and resumes the power supply fast, high-efficiently, guarantees to pull power supply system safe and reliable.
Disclosure of Invention
The invention aims to provide a fault positioning method and a fault positioning system suitable for a multi-branch line of an electrified railway, so as to solve one of the defects caused by the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a fault location method suitable for a multi-branch line of an electrified railway, including the following steps:
acquiring fault current and line-to-ground electric fields of each branch line when a fault occurs;
determining a branch line where a fault point is located according to the distribution condition of fault current of each branch line when a fault occurs;
and calculating the distance from the fault point to the local acquisition unit by using a reactance distance measurement method according to the current of the branch line where the fault point is located and the line-to-ground electric field.
Further, the method may further comprise installing an in-situ acquisition unit for current and line-to-ground field acquisition at each branch line.
Preferably, the installation location of the on-site acquisition unit comprises: the split-phase lines near the internet access points of the traction substations and the subareas, the branch lines of the junction stations, and the inlets and the outlets of the branch lines of the junction stations.
Further, in the above-mentioned case,
the method for acquiring the fault current of each branch line when a fault occurs comprises the following steps:
according to the line current Ii and the line-to-ground electric field Ui of the branch line where the local acquisition unit is located, the local acquisition unit is started and judged according to a starting criterion;
the local acquisition unit meeting the starting criterion acquires the fault current and the line-to-ground electric field of the branch line where the local acquisition unit is located when the fault occurs; and the fault current of the branch line where the local acquisition unit which does not meet the starting criterion is positioned is judged to be zero.
Further, the starting criterion is as follows:
ui is less than Uset, delta Ii is more than Iset, and after the duration of delta t and within the time Tset, Ii is less than Imin, and Ui is less than Umin;
the system comprises a local acquisition unit, a circuit-to-ground electric field acquisition unit, a current mutation quantity value acquisition unit, a user, a short-circuit current duration fixed value, a Tset, a fault trip time fixed value, Imin and Umin, wherein the delta Ii is a current mutation quantity value acquired by the local acquisition unit, the Ui is a circuit-to-ground electric field value acquired by the local acquisition unit, the Iset is a current mutation quantity fixed value, the Uset is a circuit-to-ground.
When the fault current of the line collected by at least one on-site collection unit installed on the split-phase line of the traction substation is not equal to zero and the fault current of the line collected by the on-site collection unit installed on other branch lines is equal to zero, judging that a fault point is located on the split-phase line of the traction substation.
When the line fault current collected by each local collection unit installed on the split-phase line of the traction substation is equal to zero, the fault current of the line collected by at least one local collection unit installed on the split-phase line of the subarea substation is not equal to zero, and the fault currents of the lines collected by the local collection units at the inlet and the outlet of the branch line of the junction field station are not equal to zero, the fault point is judged to be positioned on the split-phase line of the subarea substation.
When the line fault current collected by each local collection unit installed on the traction substation split-phase line is equal to zero, the line fault current collected by each local collection unit installed on the partition substation split-phase line is equal to zero, the fault current at the inlet and the outlet of at least one branch line of the pivot station is unequal, and the fault current at the inlet and the outlet of other pivot stations are equal, it is determined that the fault point is located on the branch line where the maximum fault current is located in each branch line of the pivot station where the fault current at the inlet and the outlet of the branch line is unequal.
In a second aspect, the present invention further provides a fault location system for a multi-branch line of an electrified railway, the system comprising:
an acquisition unit: the system is used for acquiring fault current and line-to-ground electric fields of each branch line when a fault occurs;
a fault positioning module: the branch line fault detection circuit is used for determining the branch line where the fault point is located according to the distribution condition of the fault current of each branch line when the fault occurs; and calculating the distance from the fault point to the local acquisition unit by using a reactance distance measurement method according to the current of the branch line where the fault point is located and the line-to-ground electric field.
Further, the obtaining module includes:
a start judgment module: the system is used for judging the starting of the local acquisition unit according to the line current Ii and the line-to-ground electric field Ui of the branch line where the local acquisition unit is located and by referring to a starting criterion;
an acquisition module: the system comprises an on-site acquisition unit, a line-to-ground electric field acquisition unit and a control unit, wherein the on-site acquisition unit is used for acquiring fault current and a line-to-ground electric field of a branch line where the on-site acquisition unit is located when a fault occurs when the on-site acquisition unit meets a starting criterion; and when the starting criterion is not met, the fault current of the branch line where the local acquisition unit is located is judged to be zero.
The beneficial effects of the invention are as follows:
(1) the problem of current fault location device to the unable accurate positioning of many branch line trouble is solved, be the effective replenishment to electrified railway power supply arm fault location function, provide reliable foundation to the troubleshooting to the power recovery time has been shortened.
(2) The problem of current fault location device can't correctly distinguish network access point both sides phase separation circuit and near-end line trouble is solved.
(3) When the fault branch is positioned, the specific kilometer number of the fault point on the fault branch line can be accurately given.
Drawings
FIG. 1 is a schematic diagram of an electrified railway multi-branch line provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating in-situ acquisition unit fault start criteria provided in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of a multi-branch line fault location system provided in accordance with an embodiment of the present invention;
FIG. 4 is a diagram of a short-circuit fault current distribution of a phase-splitting line of a substation according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a short-circuit fault location logic for split-phase lines of a substation, according to an embodiment of the present invention;
FIG. 6 is a diagram of a partitioned split-phase line short-circuit fault current distribution provided in accordance with an embodiment of the present invention;
FIG. 7 is a block diagram of partitioned split-phase line short fault location logic according to an embodiment of the present invention;
fig. 8 is a diagram of a station multi-branch line short-circuit fault current distribution according to an embodiment of the present invention;
fig. 9 is a logic diagram of a station multi-branch line short-circuit fault location provided in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The embodiment provides a fault positioning method suitable for a multi-branch line of an electrified railway, which comprises the following steps:
a: installing a local acquisition unit;
local acquisition units are installed at the inlet throats and outlets of the split-phase lines near the internet access points of the traction substations and the subareas, the branch lines of the junction field stations and are used for acquiring the current and the line-to-ground electric fields at the positions of the local acquisition units in real time.
B: the on-site acquisition unit acquires the line current Ii and the line-to-ground electric field Ui, and performs starting judgment on the on-site acquisition unit according to the acquired line current and the line-to-ground electric field;
referring to fig. 2, the starting criterion includes two parts, namely a current criterion and an electric field criterion, and the starting criterion is as follows:
when the line-to-ground electric field and the line current acquired by the on-site acquisition unit simultaneously satisfy Ui < Uset and delta Ii > Iset, and continue for delta t time, and satisfy Ii < Imin and Ui < Umin within the Tset time, starting the on-site acquisition unit;
the system comprises a local acquisition unit, a circuit-to-ground electric field acquisition unit, a current mutation quantity value acquisition unit, a user, a short-circuit current duration fixed value, a Tset, a fault trip time fixed value, Imin and Umin, wherein the delta Ii is a current mutation quantity value acquired by the local acquisition unit, the Ui is a circuit-to-ground electric field value acquired by the local acquisition unit, the Iset is a current mutation quantity fixed value, the Uset is a circuit-to-ground.
In order to prevent the impact load of the electric locomotive from being influenced, a fault current criterion cannot simply take an overcurrent effective value as a starting fixed value, a current abrupt change delta Ii which avoids the starting current of the single-train locomotive is taken as a setting basis, the time delta t of short-circuit fault current duration and the characteristic that the line current after tripping is reduced to zero due to short circuit are considered, and when the 3 conditions are met as a fault current action criterion, the conditions of no-load closing surge current with a transformer, load self-coupling surge current, abrupt closing no-load surge current and surge current when the locomotive enters a power supply area can be effectively avoided, and the situation that the signal is sent by mistake is avoided; the electric field criterion directly adopts the reduction ratio of the line to the ground electric field as the main criterion of fault starting, and simultaneously considers the electric field duration and the characteristics of electric field disappearance after tripping.
When the line current Ii and the line-to-ground electric field Ui which are acquired by the on-site acquisition unit in real time meet the starting criterion, the on-site acquisition unit is started, sends a fault starting signal, records the fault current and the line-to-ground electric field at the fault moment, and simultaneously uploads a fault report containing the fault current and the line-to-ground electric field data at the fault moment to the fault positioning module;
when the line current Ii and the line-to-ground electric field Ui acquired by the on-site acquisition unit in real time do not meet the starting criterion, the on-site acquisition unit does not send a fault starting signal, and the fault positioning module judges that the fault current does not flow through the line, and the fault current of the on-site acquisition unit is zero.
C: determining the position of a fault point according to the fault current distribution characteristics of different positions of each branch line when a fault occurs;
taking the multi-branch line shown in fig. 1 as an example, local acquisition units e1 and e2 are respectively installed on the left side phase-splitting line of a branch point on a traction substation, local acquisition units b1, c1, b2 and c2 are respectively installed at the inlet throat and the outlet of a terminal station, local acquisition units d11, d12, d13, d21, d22 and d23 are respectively installed on the side of each branch line of the terminal station near the substation, and local acquisition units f1 and f2 are respectively installed on the right side phase-splitting line of the branch point on the substation, and the schematic diagram of the multi-branch line fault location system is shown in fig. 3. The method for accurately positioning the faults according to the distribution characteristics of the line fault current acquired by each local acquisition unit comprises the following three conditions:
(1) when the phase-splitting line of the substation has a short-circuit fault, the distribution diagram of the short-circuit fault current of the phase-splitting line of the substation is shown in fig. 4, the short-circuit current flows to the short-circuit point of the phase-splitting line of the traction substation through the network access point of the traction substation, and no short-circuit current flows through other branch lines.
The flowchart of the method for judging the fault point on the split-phase line of the traction substation is shown in fig. 5: and B, starting the fault positioning module, inquiring fault current and line-to-ground electric fields acquired by each on-site acquisition unit, judging the starting of each on-site acquisition unit according to the step B, and judging that a fault point is positioned on a phase splitting line of the traction substation where the started on-site acquisition unit is positioned when a certain on-site acquisition unit installed on the phase splitting line of the traction substation is started and the on-site acquisition units installed on other branch lines are not started.
When at least one of the local acquisition units e1 and e2 is started, and the other local acquisition units are not started, the fault current of the line when the fault uploaded by each local acquisition unit occurs is used for representing the characteristic criterion that the fault point is positioned on the split-phase line of the traction substation, wherein the characteristic criterion is as described in formula (1):
each current in equation (1) represents the fault current flowing through the line recorded after the local acquisition unit meeting the start criterion is started, and the branch line current is determined to be zero if the local acquisition unit is not started. Taking the in-situ collection unit e1 as an example: as the fault point is positioned on the phase splitting line of e1, the fault current flows to the fault point from the traction substation through the phase splitting line of the traction substation, the on-site acquisition unit e1 is started, and the fault current Ie1 is recorded and then uploaded to the fault positioning module; taking the in-situ collection unit b1 as an example: the line where the b1 is located is an uplink line between points on the traction substation and the subareas, no fault current flows through the line, so the local acquisition unit b1 is not started, and the fault positioning module judges that the fault current Ib1 of the local acquisition unit b1 is equal to zero.
Wherein, Ie1 and Ie2 represent line fault currents uploaded by local acquisition units e1 and e2 respectively installed on left-side phase-separated lines of substation upper nodes, Ib1, Ic1, Ib2 and Ic2 represent line fault currents uploaded by local acquisition units b1, c1, b2 and c2 respectively installed at inlet throats and outlets of hub terminals, Id11, Id12, Id13, Id21, Id22 and Id23 represent line fault currents uploaded by local acquisition units d11, d12, d13, d21, d22 and d23 respectively installed on near substation sides of branch lines of terminals, and If1 and If2 represent line fault currents uploaded by local acquisition units f1 and f2 respectively installed on right-side phase-separated lines of substation upper nodes.
Namely: when the fault current of the line collected by at least one on-site collection unit installed on the split-phase line of the traction substation is not equal to zero and the fault current of the line collected by the on-site collection unit installed on other branch lines is equal to zero, judging that a fault point is located on the split-phase line of the traction substation.
(2) When a phase splitting line of a substation has a short-circuit fault, the distribution of the short-circuit current on the power supply arm is as shown in fig. 6, the short-circuit current flows to the short-circuit point of the phase splitting line of the substation through the trunk line of the power supply arm and the mesh point on the substation, and the short-circuit current flows through branch lines of the whole power supply arm except the phase splitting line of the substation.
The flowchart of the method for judging the fault point on the phase-separated line of the partition is shown in fig. 7: starting a fault positioning module, inquiring fault current and a line-to-ground electric field Ui acquired by each local acquisition unit, judging the starting of each local acquisition unit according to the step B, and judging that a fault point is positioned on a partitioned phase-separated line where the started local acquisition unit is positioned when each local acquisition unit installed on the partitioned phase-separated line of the traction substation is not started and at least one local acquisition unit installed on the partitioned phase-separated line is started and local acquisition units at the inlet and the outlet of each branch line of the junction field station are started; the characteristic criterion that the fault point is positioned on the phase-splitting line of the subarea is represented by the fault current of the line when the fault uploaded by each local acquisition unit occurs, and the characteristic criterion is as follows:
namely: when the line fault current collected by each local collection unit installed on the split-phase line of the traction substation is equal to zero, the fault current of the line collected by at least one local collection unit installed on the split-phase line of the subarea station is not equal to zero, and the fault currents of the lines collected by the local collection units at the inlet and the outlet of each branch line of the junction field station are not equal to zero, the fault point is judged to be positioned on the split-phase line of the subarea station where the started local collection unit is positioned.
(3) When a short-circuit fault occurs in a plurality of branch lines of a station, the distribution of short-circuit current on the power supply arm is as shown in fig. 8, the short-circuit current flows through each branch line on the main line, fault current also flows on the branch lines of non-fault stations, but no short-circuit current flows through phase separation lines of a substation and a subarea station, and the fault branch current is the maximum value of all branch currents of the fault station;
fig. 9 shows a flowchart of a method for determining that a fault point is located on a multi-branch line of a station: starting a fault positioning module, inquiring fault current and a line-to-ground electric field Ui acquired by each local acquisition unit, judging the starting of each local acquisition unit according to the step B, and judging that a fault point is positioned on a line where the maximum branch current of the hub station with unequal incoming and outgoing currents is positioned when each local acquisition unit installed on a traction substation split-phase line is not started, each local acquisition unit installed on a partition substation split-phase line is not started, the currents of the inlet and the outlet of at least one branch line of the hub station are unequal, and the currents of the inlet and the outlet of other hub stations are equal;
the characteristic criterion of the multi-branch line with the fault point located in the station is represented by the fault current of the line when the fault uploaded by each local acquisition unit occurs, and taking the branch line with the fault point located in the local acquisition unit d12 as an example, the characteristic criterion is as follows:
namely: when the fault current of the line collected by each local collection unit installed on the split-phase line of the traction substation is equal to zero, the fault current of the line collected by each local collection unit installed on the split-phase line of the regional substation is equal to zero, the currents of the inlet and the outlet of the branch line of at least one pivot station are not equal, and the currents of the inlet and the outlet of other pivot stations are equal, the fault point is determined to be located on the branch line where the maximum fault current is located in each branch line of the pivot station with the branch line outlet and the inlet having unequal fault currents.
When the accurate fault point of the branch line is accurately positioned, the distance from the fault point to the local acquisition unit can be calculated by adopting a reactance distance measurement method according to the line-to-ground electric field and the fault current sent by the local acquisition unit on the branch line where the fault point is positioned.
The embodiment of the invention also provides a fault positioning system suitable for the multi-branch line of the electrified railway, which is used for realizing the method and comprises the following steps:
an acquisition module: the system is used for acquiring fault current and line-to-ground electric fields of each branch line when a fault occurs;
a fault positioning module: the branch line fault detection circuit is used for determining the branch line where the fault point is located according to the distribution condition of the fault current of each branch line when the fault occurs; and calculating the distance from the fault point to the local acquisition unit by using a reactance distance measurement method according to the current of the branch line where the fault point is located and the line-to-ground electric field.
The acquisition module comprises:
a start judgment module: the system is used for judging the starting of the local acquisition unit according to the line current Ii and the line-to-ground electric field Ui of the branch line where the local acquisition unit is located and by referring to a starting criterion;
an acquisition module: the system comprises an on-site acquisition unit, a line-to-ground electric field acquisition unit and a control unit, wherein the on-site acquisition unit is used for acquiring fault current and a line-to-ground electric field of a branch line where the on-site acquisition unit is located when a fault occurs when the on-site acquisition unit meets a starting criterion; and when the starting criterion is not met, the fault current of the branch line where the local acquisition unit is located is judged to be zero.
According to the fault positioning method and system suitable for the multi-branch line of the electrified railway, the local acquisition units are installed on the multi-branch line of each branch line comprising the split-phase line and the field station, the starting judgment of the local acquisition units is carried out according to the line current and the line-to-ground electric field of the positions of the local acquisition units, the positions of the branch lines of fault points are determined according to the distribution characteristics of the fault current acquired by the local acquisition units, and the faults of the multi-branch line are accurately positioned.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A fault location method for a multi-branch line of an electrified railway, the method comprising the steps of:
acquiring fault current and line-to-ground electric fields of each branch line when a fault occurs;
determining a branch line where a fault point is located according to the distribution condition of fault current of each branch line when a fault occurs;
calculating the distance from the fault point to the local acquisition unit by using a reactance distance measurement method according to the current of the branch line where the fault point is located and the line-to-ground electric field;
the method also comprises installing an in-situ acquisition unit for acquiring current and a line-to-ground electric field on each branch line;
the method for acquiring the fault current of each branch line when a fault occurs comprises the following steps:
according to the line current Ii and the line-to-ground electric field Ui of the branch line where the local acquisition unit is located, the local acquisition unit is started and judged according to a starting criterion;
the local acquisition unit meeting the starting criterion acquires the fault current and the line-to-ground electric field of the branch line where the local acquisition unit is located when the fault occurs; the fault current of the branch line where the local acquisition unit which does not meet the starting criterion is zero;
the start-up criteria are as follows:
ui is less than Uset, delta Ii is more than Iset, and after the duration of delta t and within the time Tset, Ii is less than Imin, and Ui is less than Umin;
wherein, delta Ii is a line current sudden change value acquired by the local acquisition unit; iset is a current mutation quantitative fixed value; ui is the value of the line-to-ground electric field collected by the in-situ collection unit; uset is a fixed value of the sudden change of the line-to-ground electric field; Δ t is the duration of the short-circuit fault current; tset is a fixed value of fault trip time; imin is a current disappearance set value; umin is the vanishing fixed value of the line-to-ground electric field.
2. The method of claim 1, wherein the installation location of the local acquisition unit comprises: the split-phase lines near the internet access points of the traction substations and the subareas, the branch lines of the junction stations, and the inlets and the outlets of the branch lines of the junction stations.
3. The method as claimed in claim 2, wherein the fault point is determined to be located on the split phase line of the traction substation when the fault current of the line collected by at least one local collection unit installed on the split phase line of the traction substation is not equal to zero and the fault currents of the lines collected by the local collection units installed on the other branch lines are equal to zero.
4. The method of claim 2, wherein the fault location is determined to be on the phase-separated line of the electric railway when the line fault current collected by each local collection unit installed on the phase-separated line of the traction substation is equal to zero, the fault current collected by at least one local collection unit installed on the phase-separated line of the subarea is not equal to zero, and the fault currents collected by the local collection units at the entrance and exit of the branch line of the terminal field station are not equal to zero.
5. The method of claim 2, wherein when the line fault current collected by each local collection unit installed on the split-phase line of the traction substation is equal to zero, the line fault current collected by each local collection unit installed on the split-phase line of the partitioned substation is equal to zero, the fault current at the inlet and the outlet of the branch line of at least one hub site station is not equal, and the fault currents at the inlets and the outlets of other hub site stations are equal, it is determined that the fault point is located on the branch line where the maximum fault current is located in each branch line of the hub site station where the fault currents at the inlet and the outlet of the branch line are not equal.
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