CN117471358A - Traction power supply incoming line fault analysis method, equipment and medium - Google Patents

Traction power supply incoming line fault analysis method, equipment and medium Download PDF

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Publication number
CN117471358A
CN117471358A CN202311425127.3A CN202311425127A CN117471358A CN 117471358 A CN117471358 A CN 117471358A CN 202311425127 A CN202311425127 A CN 202311425127A CN 117471358 A CN117471358 A CN 117471358A
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China
Prior art keywords
phase
line
fault
incoming line
voltage
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CN202311425127.3A
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Inventor
刘洋
郭华
任雪涛
倪传坤
葛海波
姜睿智
周小金
李飞
曹裕捷
谢伟鸿
张建雨
李望
赵卫军
林忠树
赵鹏飞
邵鹏飞
夏嘉文
陈希
周剑
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Chengdu Southwest Jiaotong University Xuji Electric Co ltd
Xuchang XJ Software Technology Co Ltd
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Chengdu Southwest Jiaotong University Xuji Electric Co ltd
Xuchang XJ Software Technology Co Ltd
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Priority to CN202311425127.3A priority Critical patent/CN117471358A/en
Publication of CN117471358A publication Critical patent/CN117471358A/en
Pending legal-status Critical Current

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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a traction station power supply incoming line fault analysis method, equipment and medium, which comprise the following specific steps: acquiring three-phase voltage when the circuit breaker is in the closing position, and determining the maximum value and the minimum value of the zero sequence voltage, the negative sequence voltage and the three-phase voltage; acquiring a phase-to-phase fault zero sequence voltage fixed value, a ground fault criterion high fixed value and a ground fault criterion low fixed value; judging whether the line has a ground fault or not based on the maximum value and the minimum value of the three-phase voltage and the high fixed value and the low fixed value of the ground fault criterion; and judging whether the interphase fault exists in the circuit or not based on the interphase fault zero sequence voltage fixed value, the zero sequence voltage and the negative sequence voltage. On the basis of analyzing various fault conditions of the incoming line of the traction substation, the current three-phase voltage is analyzed, the fault type is judged, the problem that various incoming line faults of the current electrified railway bilateral power supply system are difficult to cut can be solved, and the power supply reliability of the bilateral power supply system is effectively improved. The fault removal method can reliably reflect and timely remove various incoming line faults of the bilateral power supply system.

Description

Traction power supply incoming line fault analysis method, equipment and medium
Technical Field
The invention relates to the technical field of traction power supply systems, in particular to a traction station power supply incoming line fault analysis method, equipment and medium.
Background
In areas with rare human smoke and weak power systems, electrified railways generally adopt bilateral power supply systems (shown in fig. 1) so as to increase the length of traction power supply arms and reduce the number of traction power substations. In the electrified railway bilateral power supply system, high-voltage circuits (the voltage level is generally 110 kV) of traction substations at two sides are limited by factors such as engineering implementation, optical fiber differential protection is not installed, and functions such as single-ended distance protection and overcurrent protection are only configured at a power grid side. When the line breaks down, the fault current not only comes from the local power grid, but also comes from the opposite-side traction substation, but the protection can only trip the power grid side circuit breaker, but can not trip the line incoming circuit breaker at the traction substation side, and the fault can not be completely removed, so that the power supply of the opposite-side traction substation is still in a fault state, and the normal power supply of the electrified railway is affected.
In addition, the power grid side in the bilateral power supply system is generally a heavy current grounding system, the traction side is a neutral point ungrounded system, meanwhile, as the impedance of the traction side is large (comprising 2 traction transformers, an incoming line and a contact network line), when the line breaks down and a high-voltage line power grid side switch is tripped, the fault current fault characteristic of the incoming line side of the traction substation is not obvious, so that even if the traditional overcurrent protection or distance protection is adopted, the fault is difficult to react and cut off.
Disclosure of Invention
The invention aims to provide a traction substation power supply incoming line fault analysis method, equipment and medium, which are used for analyzing the current three-phase voltage and judging the fault type on the basis of analyzing various fault conditions of an incoming line of a traction substation, so that the problem that various incoming line faults of a current electrified railway bilateral power supply system are difficult to cut can be solved, and the power supply reliability of the bilateral power supply system is effectively improved. The fault removal method can reliably reflect and timely remove various incoming line faults of the bilateral power supply system.
The invention is realized by the following technical scheme:
the invention provides a traction station power supply incoming line fault analysis method, which comprises the following specific steps:
acquiring three-phase voltage when the circuit breaker is in the closing position, and determining the maximum value and the minimum value of the zero sequence voltage, the negative sequence voltage and the three-phase voltage;
acquiring a phase-to-phase fault zero sequence voltage fixed value, a ground fault criterion high fixed value and a ground fault criterion low fixed value;
judging whether the line has a ground fault or not based on the maximum value and the minimum value of the three-phase voltage and the high fixed value and the low fixed value of the ground fault criterion;
and judging whether the interphase fault exists in the circuit or not based on the interphase fault zero sequence voltage fixed value, the zero sequence voltage and the negative sequence voltage.
According to the invention, on the basis of analyzing various fault conditions of the incoming line of the traction substation, the current three-phase voltage is analyzed, the fault type is judged, the problem that various incoming line faults of the current electrified railway bilateral power supply system are difficult to cut can be solved, and the power supply reliability of the bilateral power supply system is effectively improved. The fault removal method can reliably reflect and timely remove various incoming line faults of the bilateral power supply system.
Further, the specific calculation step for judging whether the line has the ground fault comprises the following steps:
wherein U is A For A phase incoming line voltage, U B For B-phase incoming line voltage, U C For C-phase incoming line voltage, U D_H1 For high definite value of ground fault criterion, U D_L1 Low value for ground fault criteria。
Further, the specific calculation step of judging whether the line has interphase faults comprises the following steps:
wherein U is 0 For the maximum zero sequence voltage of the three-phase voltage, U 2 Is a negative sequence voltage, U X_L0 Is fixed for the zero sequence voltage of interphase fault, U X_H2 And (5) determining the value of the phase-to-phase fault negative sequence voltage.
Further, the ground fault includes that the incoming line generates a C-phase single-phase short circuit, the incoming line generates a B-phase single-phase short circuit, the incoming line generates an a-phase single-phase short circuit, the incoming line generates an AB-phase short circuit, the incoming line generates an AC-phase short circuit, and the incoming line generates a BC-phase short circuit.
Further, the step of judging whether the incoming line is in a C-phase single-phase short circuit, the incoming line is in a B-phase single-phase short circuit or the incoming line is in an A-phase single-phase short circuit includes: and acquiring an A/B/C phase short-circuit current of the incoming line traction side and an A/B/C phase short-circuit voltage of the incoming line traction side, and judging that a fault exists if the A/B/C phase short-circuit current of the incoming line traction side is zero and the A/B/C phase short-circuit voltage of the incoming line traction side is reduced.
Further, the step of judging whether the incoming line is in AB interphase short circuit, the incoming line is in AC interphase short circuit or the incoming line is in BC interphase short circuit comprises the following steps: and monitoring the AB interphase voltage, and judging that a fault exists if the voltage is reduced.
Further, before analyzing the line faults, the method further comprises the steps of obtaining short-circuit current at the side of the incoming line power grid and short-circuit current at the side of the traction transformer, judging whether the current value is within a threshold value, and if not, analyzing the line faults.
Further, the step of obtaining the short-circuit current at the incoming line power grid side includes: acquiring power supply electromotive force, system impedance corresponding to an incoming line and impedance from the head end of the incoming line to a fault point, and determining short-circuit current at the side of an incoming line power grid;
the traction substation side short-circuit current obtaining step comprises the following steps: the method comprises the steps of obtaining power supply electromotive force, impedance from the tail end of an incoming line to a fault point, impedance of a traction transformer, impedance of a contact net, system impedance corresponding to the incoming line, short-circuit current at the side of an incoming line power grid and incoming line traction transformation.
A second aspect of the invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a method of traction power supply line fault analysis when executing the program.
A third aspect of the invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method of traction substation power supply line fault analysis.
Compared with the prior art, the invention has the following advantages and beneficial effects:
on the basis of analyzing various fault conditions of the incoming line of the traction substation, the current three-phase voltage is analyzed, the fault type is judged, the problem that various incoming line faults of the current electrified railway bilateral power supply system are difficult to cut can be solved, and the power supply reliability of the bilateral power supply system is effectively improved. The fault removal method can reliably reflect and timely remove various incoming line faults of the bilateral power supply system.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a flow chart of a fault analysis method in an embodiment of the invention;
fig. 2 is a schematic diagram of bilateral power supply formed by two traction power transformation substations in an embodiment of the invention;
fig. 3 is a schematic circuit diagram of the incoming line 1 in the embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a B-phase line short-circuit grounding of a dual-side power supply circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a traction load of a dual-sided power supply circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a short circuit to ground for the phase A line of the dual-sided power circuit in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a regenerative braking current direction of a dual-side power supply circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a double-sided power supply circuit incoming line AB interphase short circuit in an embodiment of the present invention;
FIG. 9 is a schematic diagram of a dual-sided power circuit incoming AC phase-to-phase short circuit in an embodiment of the invention;
fig. 10 is a schematic diagram of a dual-side power supply circuit incoming BC inter-phase short circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, a first aspect of the present embodiment provides a method for analyzing a fault of an incoming line of a traction substation, including the following specific steps:
acquiring three-phase voltage when the circuit breaker is in the closing position, and determining the maximum value and the minimum value of the zero sequence voltage, the negative sequence voltage and the three-phase voltage;
acquiring a phase-to-phase fault zero sequence voltage fixed value, a ground fault criterion high fixed value and a ground fault criterion low fixed value;
judging whether the line has a ground fault or not based on the maximum value and the minimum value of the three-phase voltage and the high fixed value and the low fixed value of the ground fault criterion;
and judging whether the interphase fault exists in the circuit or not based on the interphase fault zero sequence voltage fixed value, the zero sequence voltage and the negative sequence voltage.
According to the method and the device for analyzing the three-phase voltage of the traction substation, on the basis of analyzing various fault conditions of the incoming line of the traction substation, the current three-phase voltage is analyzed, the fault type is judged, the problem that various incoming line faults of a current electrified railway bilateral power supply system are difficult to cut can be solved, and the power supply reliability of the bilateral power supply system is effectively improved. The fault removal method can reliably reflect and timely remove various incoming line faults of the bilateral power supply system.
In some possible embodiments, the step of determining whether the line has a ground fault specifically includes:
wherein U is A For A phase incoming line voltage, U B For B-phase incoming line voltage, U C For C-phase incoming line voltage, U D_H1 The ground fault criterion is high in fixed value and can be set to be 70V by default; u (U) D_L1 For low ground fault criteria, the default is 20V.
In some possible embodiments, the determining whether the line has an inter-phase fault specifically calculating step includes:
wherein U is 0 For the maximum zero sequence voltage of the three-phase voltage, U 2 Is a negative sequence voltage, U X_L0 The zero sequence voltage of the interphase fault is fixed, and can be set to be 15V by default; u (U) X_H2 The phase-to-phase fault negative sequence voltage is set to be 12V by default.
In some possible embodiments, to avoid that the above criteria fail due to three-phase voltage loss caused by three-phase faults, a three-phase voltage loss criterion is added: when the circuit breaker is in the closed position and the three-phase voltage maximum Max (U A 、U B 、U C ) Are all smaller than the constant value U of the decompression sy (settable, default to 20V). When the protection meets any criterion, the line-side circuit breaker of the traction substation is tripped through the action of the delay time T, and the setting mode of the delay time T is the post acceleration time for avoiding the protection of the power grid side line.
In some possible embodiments, the ground fault includes a C-phase single-phase short of the incoming line, a B-phase single-phase short of the incoming line, an a-phase single-phase short of the incoming line, an AB-phase short of the incoming line, an AC-phase short of the incoming line, and a BC-phase short of the incoming line.
In some possible embodiments, the step of determining that the incoming line has a C-phase single-phase short circuit, the incoming line has a B-phase single-phase short circuit, or the incoming line has an a-phase single-phase short circuit includes: and acquiring an A/B/C phase short-circuit current of the incoming line traction side and an A/B/C phase short-circuit voltage of the incoming line traction side, and judging that a fault exists if the A/B/C phase short-circuit current of the incoming line traction side is zero and the A/B/C phase short-circuit voltage of the incoming line traction side is reduced.
In some possible embodiments, the step of determining that the incoming line is shorted AB interphase, the incoming line is shorted AC interphase, or the incoming line is shorted BC interphase includes: and monitoring the AB interphase voltage, and judging that a fault exists if the voltage is reduced.
In some possible embodiments, before analyzing the line fault, the method further includes obtaining a line grid side short-circuit current and a traction substation side short-circuit current, judging whether the current value is within a threshold value, if not, analyzing the line fault if the line fault exists.
In some possible embodiments, the step of obtaining the incoming grid side short-circuit current includes: acquiring power supply electromotive force, system impedance corresponding to an incoming line and impedance from the head end of the incoming line to a fault point, and determining short-circuit current at the side of an incoming line power grid;
the traction substation side short-circuit current obtaining step comprises the following steps: the method comprises the steps of obtaining power supply electromotive force, impedance from the tail end of an incoming line to a fault point, impedance of a traction transformer, impedance of a contact net, system impedance corresponding to the incoming line, short-circuit current at the side of an incoming line power grid and incoming line traction transformation.
A second aspect of the present embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements a method for analyzing a fault of a line incoming of a traction power supply when executing the program.
A third aspect of the present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a traction substation power supply line fault analysis method.
Example 2
The traction transformers of the through power supply system are all single-phase transformers, AB phase-to-phase power supply compensation equipment is additionally arranged on a traction substation to eliminate the influence of negative sequence and harmonic waves on a power grid, and reactive power is compensated to improve the power factor. In the lattice experiment, investment, construction period and the like are considered, in-phase power supply compensation equipment is not added, and only bilateral power supply experiments of the overhead contact system are carried out. The transformer of the railway traction substation is a complete standby system, only one incoming line is put into operation, and when the running incoming line fails or loses power due to other reasons, the other incoming line is switched to the other incoming line through the standby automatic switching. In this case, the traction transformer is connected between the incoming line A phase and the incoming line B phase of the power grid, and the incoming line C phase is suspended.
For the simplicity of analysis, the system can be implemented by a bilateral power supply system formed by only two traction devices, and the equivalent circuit of the system is shown in fig. 2.
As shown in FIG. 3, a circuit diagram of a short-circuit fault occurring in the incoming line 1 is shown, in whichIs the electromotive force of the power supply, Z s1 For the system impedance corresponding to the incoming line 1, Z L11 Impedance from the head end of the incoming line 1 to the fault point, Z L12 For impedance of the end of the incoming line 1 to the fault point, Z T1 For impedance of traction transformer 1, Z OCS Is the impedance of the contact net, Z T2 Z is the impedance of the traction transformer 2 L2 For impedance of the end of the incoming line 2 to the fault point, Z s2 The system impedance corresponding to the incoming line 2; />For the line 1 grid side short-circuit current, +.>For the short-circuit current of the incoming line 1 traction substation side, the calculating steps comprise:
when in bilateral power supply, the length of a power supply arm is at least twice that of the unilateral power supply, the contact net is in 27.5kV voltage class, and the impedance Z of the contact net OCS Returning to 110kV, the incoming line impedance is far greater than 110 kV; the capacity of the traction transformers 1 and 2 is much smaller with respect to the system capacity of the power system 110kV or more, so the impedance Z T1 And Z T2 The impedance is larger than 110kV incoming line impedance; therefore, the short-circuit current of the traction substation side of the incoming line 1 obtained by the formula is very small, and great difficulty is brought to relay protection configuration of the traction side of the incoming line.
If the optical fiber differential protection is installed on the incoming line, the incoming line is subjected to two-phase short circuit and three-phase short circuit, the differential protection can cut off the switch at the incoming line power grid side and the traction side simultaneously, the optical fiber differential protection device generally has corresponding current protection as backup protection, and at the moment, a new protection principle or device can not be added at the incoming line traction side. However, the power system is generally provided with a differential protection device only on a line with a voltage level of 220kV or above, the through power supply is mainly used in a region with weak power system in the west in the early popularization stage to increase the length of traction power supply arms and reduce the number of traction substations, and the line incoming voltage level of the power system is 110kV at most, at this time, the power system substation side is generally provided with distance protection, and the line incoming traction side has no relay protection function. In this case, relay protection must be added on the incoming line traction substation side. When bilateral power supply is performed, for incoming lines, power supplies are arranged on two sides, and current protection or distance protection in the direction of incoming line traction power transformation is needed.
As shown in fig. 2, the step of judging that the incoming line is in a C-phase single-phase short circuit includes: when the double-side power supply is performed, the traction substation adopts a single-phase transformer, and when the incoming line is in C-phase single-phase short circuit, the incoming line draws C-phase short circuit current at the side of the incoming lineSubstantially zero, no current protection in the tape direction or distance protection is applied. Since the neutral point of the power substation transformer is grounded, the power substation transformer is in the same time +>The voltage loss protection can be added to cut off the incoming line C-phase single-phase short circuit; if it is a high resistance fault, < >>When the fixed value is not reduced, the protection still can not detect faults, and at the moment, after the distance protection action of the circuit breaker of the traction substation side CB1 is needed to be waited, the voltage-losing protection is started to disconnect the circuit breaker of the traction substation side CB2. Therefore, a certain delay is increased, but the C-phase incoming line traction substation side is not connected, and no more harm is brought.
As shown in fig. 4 and 5, the step of judging that the incoming line has a B-phase single-phase short circuit includes: when the incoming line is in B-phase single-phase short circuit, because the high-voltage side of the traction transformer has no neutral point, short circuit current is only provided by the power substation transformer, and the current direction is shown as a broken line in the graph B. This situation is the same as the current direction of the traction load in the bilateral power supply circuit shown in fig. c, for the power reference direction protected by the bilateral power supply circuit, the phase a is reverse, the phase B is forward, and for the phase B metallic ground fault, since the short-circuit current needs to pass through the whole length of the phase a circuit and the traction transformer, the short-circuit current is likely to be similar to the current required for traction, and the simple power direction protection cannot distinguish whether the single-phase ground fault of the phase B or the traction load exists. But the B-phase voltage drop decreases during metallic short circuits, so distance protection and low voltage initiated strip direction current protection can be used for B-phase metallic ground short circuits.
As shown in fig. 6 and 7, the step of judging that the incoming line has a single-phase short circuit of a phase comprises: when the incoming line is in a phase A single-phase short circuit, the high-voltage side of the traction transformer has no neutral point, short-circuit current is only provided by the power substation transformer, and the current direction is shown as a broken line in fig. 6. This situation is the same as the current direction of regenerative braking in the bilateral power supply circuit shown in fig. 6, and for the power reference direction protected here, the a phase is forward, the B phase is reverse, and for the metallic ground fault of the a phase, since the short-circuit current needs to pass through the full length of the B phase line and the traction transformer, the short-circuit current is likely to be similar to the regenerative current, and the simple power direction protection cannot distinguish whether the single-phase ground fault of the a phase is a regenerative braking. But the a-phase voltage drop decreases during metallic short circuits, so distance protection and low voltage initiated strip direction current protection can be used for a-phase metallic ground short circuits.
As shown in fig. 8, the step of determining that an AB interphase short circuit occurs in the incoming line includes: when the incoming line is short-circuited between phases AB, the situation is the same as that of the grounding short-circuit of phase A, and the short-circuit current is provided through the traction network. Short-circuit current is required to pass through the whole length of a contact network line and the incoming lines of the two traction transformers and the right traction, and is smaller than the situation described by the occurrence of A-phase single-phase short circuit of the incoming lines, and the voltage between AB phases is reduced. The simple power direction protection cannot distinguish whether the AB phase is short-circuited or regenerative braking exists.
As shown in fig. 9, the incoming line AC interphase short circuit judging step includes: when the incoming line is short-circuited between the AC phases, the a-phase is grounded as in the case of the short-circuited, but the short-circuit current is supplied through the traction network. Short-circuit current is required to pass through the whole length of the B-phase incoming line and the traction transformer, and the voltage between the AC phases is reduced. The simple power direction protection cannot distinguish whether an AC phase-to-phase short circuit or regenerative braking exists.
As shown in fig. 10, the step of determining BC-phase-to-phase short circuit in the incoming line includes: when the incoming line is short-circuited between BC phases, the situation is the same as the B-phase grounding short-circuit, except that the short-circuit current is supplied through the traction network. Short-circuit current needs to pass through the whole length of the A-phase incoming line and the traction transformer, and BC interphase voltage is reduced. The simple power direction protection cannot distinguish whether BC is interphase short-circuited or train load current.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The traction station power supply incoming line fault analysis method is characterized by comprising the following specific steps of:
acquiring three-phase voltage when the circuit breaker is in the closing position, and determining the maximum value and the minimum value of the zero sequence voltage, the negative sequence voltage and the three-phase voltage;
acquiring a phase-to-phase fault zero sequence voltage fixed value, a ground fault criterion high fixed value and a ground fault criterion low fixed value;
judging whether the line has a ground fault or not based on the maximum value and the minimum value of the three-phase voltage and the high fixed value and the low fixed value of the ground fault criterion;
and judging whether the interphase fault exists in the circuit or not based on the interphase fault zero sequence voltage fixed value, the zero sequence voltage and the negative sequence voltage.
2. The method for analyzing the incoming line fault of the traction power supply according to claim 1, wherein the step of determining whether the line has the ground fault specifically comprises the steps of:
wherein U is A For A phase incoming line voltage, U B For B-phase incoming line voltage, U C For C-phase incoming line voltage, U D_H1 For high definite value of ground fault criterion, U D_L1 The ground fault criteria are low constant.
3. The traction substation power supply line fault analysis method according to claim 1, wherein the step of determining whether the line has an inter-phase fault specifically includes:
wherein U is 0 For the maximum zero sequence voltage of the three-phase voltage, U 2 Is a negative sequence voltage, U X_L0 Is fixed for the zero sequence voltage of interphase fault, U X_H2 And (5) determining the value of the phase-to-phase fault negative sequence voltage.
4. The traction substation power supply line fault analysis method according to claim 1, wherein the ground fault comprises a line C phase single-phase short circuit, a line B phase single-phase short circuit, a line a phase single-phase short circuit, a line AB phase short circuit, a line AC phase short circuit and a line BC phase short circuit.
5. The traction power supply line fault analysis method according to claim 4, wherein the line C-phase single-phase short circuit, line B-phase single-phase short circuit or line a-phase single-phase short circuit judging step includes: and acquiring an A/B/C phase short-circuit current of the incoming line traction side and an A/B/C phase short-circuit voltage of the incoming line traction side, and judging that a fault exists if the A/B/C phase short-circuit current of the incoming line traction side is zero and the A/B/C phase short-circuit voltage of the incoming line traction side is reduced.
6. The traction power supply line fault analysis method according to claim 5, wherein the line AB phase-to-line short-circuit, line AC phase-to-line short-circuit or line BC phase-to-line short-circuit judging step includes: and monitoring the AB/AC/BC interphase voltage, and judging that a fault exists if the voltage is reduced.
7. The method for analyzing line faults of a traction substation power supply according to claim 1, further comprising the steps of acquiring line grid side short-circuit current and traction substation side short-circuit current before analyzing line faults, judging whether a current value is within a threshold value, and if not, analyzing the line faults.
8. The traction substation inlet line fault analysis method according to claim 7, wherein the inlet line grid side short circuit current acquisition step includes: acquiring power supply electromotive force, system impedance corresponding to an incoming line and impedance from the head end of the incoming line to a fault point, and determining short-circuit current at the side of an incoming line power grid;
the traction substation side short-circuit current obtaining step comprises the following steps: the method comprises the steps of obtaining power supply electromotive force, impedance from the tail end of an incoming line to a fault point, impedance of a traction transformer, impedance of a contact net, system impedance corresponding to the incoming line, short-circuit current at the side of an incoming line power grid and incoming line traction transformation.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the traction power inlet failure analysis method of any one of claims 1 to 8 when the program is executed by the processor.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements a traction power supply line fault analysis method as claimed in any one of claims 1 to 8.
CN202311425127.3A 2023-10-30 2023-10-30 Traction power supply incoming line fault analysis method, equipment and medium Pending CN117471358A (en)

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