CN108957238B - Device and method for positioning faults of urban rail transit contact network - Google Patents
Device and method for positioning faults of urban rail transit contact network Download PDFInfo
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- CN108957238B CN108957238B CN201810868994.7A CN201810868994A CN108957238B CN 108957238 B CN108957238 B CN 108957238B CN 201810868994 A CN201810868994 A CN 201810868994A CN 108957238 B CN108957238 B CN 108957238B
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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
Abstract
The invention provides a device and a method for positioning faults of an urban rail transit contact network, which relate to the field of power grid monitoring, and the device comprises: the system comprises a direct current transmitter, a bilateral coupling tripping device and a direct current traction measurement and control protection device. The system comprises a direct current transmitter, a bilateral coupling tripping device and a direct current traction measurement and control protection device. The method comprises the steps that a direct current transmitter detects current and voltage information of an urban rail transit overhead line system and sends the detected current and voltage information to a direct current traction measurement and control protection device; and the direct current traction measurement and control protection device determines the fault position of the urban rail transit overhead line system according to the detected current and voltage information. The device and the method in the embodiment of the invention can quickly find the specific position of the fault and improve the efficiency of fault location.
Description
Technical Field
The invention relates to the field of power grid monitoring, in particular to a device and a method for positioning faults of an urban rail transit contact network.
Background
At present, a power supply system of a contact network similar to the rail transit of a subway is not a single-end power supply mode or a simple double-end power supply mode, but a double-end power supply mode with double-side switching of the size and the size, and the power supply system is correspondingly complicated. When a power supply system fails, it is very difficult to find the fault quickly and accurately.
The existing power supply mode is manually used for on-site detection after a fault occurs. This takes a significant amount of human and material capital and time, thus reducing the efficiency of the transportation.
Disclosure of Invention
The invention aims to provide a device and a method for positioning faults of an urban rail transit contact network, so as to solve the problems. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the embodiment of the invention provides a fault positioning device for an urban rail transit overhead line system; the method comprises the following steps:
and the direct current transmitter is arranged between the transformer substation and the contact network. The transformer substation is used for supplying power to the contact network; the direct current transmitter is used for detecting a first current of the contact network, detecting a first voltage of the contact network to the rail and detecting a second voltage of the contact network to the ground.
And the double-side linked tripping device is connected with the double-side linked tripping device of the adjacent transformer substation. The double-side gang tripping device is used for receiving the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations from the double-side gang tripping device of the adjacent substation. The other substations are used for supplying power to the contact network; the other substations include the adjacent substation.
And the direct current traction measurement and control protection device is connected between the direct current transmitter and the double-side coupled tripping device. The direct current traction measurement and control protection device is used for receiving the first current, the first voltage and the second voltage output by the direct current transmitter; and the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations are received from the double-side gang jumping device. The direct current traction measurement and control protection device is further used for determining the position of the contact network fault according to the received first current, the received first voltage and the received second voltage.
Optionally, the overhead line system includes an ascending overhead line system and a descending overhead line system. The direct current transmitter, the direct current traction measurement and control protection device and the bilateral combined tripping device are arranged between the transformer substation and the uplink contact network and between the transformer substation and the downlink contact network. And the two ganged tripping devices corresponding to the uplink contact network arranged in the same transformer substation are connected with each other.
The direct current transmitter corresponding to the downlink contact network is used for collecting first sub-current of the downlink contact network, detecting first sub-voltage of the downlink contact network to a track and detecting second sub-voltage of the downlink contact network to the ground, and sending the first sub-current, the first sub-voltage and the second sub-voltage to the direct current traction measurement and control protection device corresponding to the downlink contact network. And the direct current transmitter corresponding to the downlink contact network is also used for sending the first sub-current to the direct current traction measurement and control protection device corresponding to the uplink contact network. The first voltage received by the direct current traction measurement and control protection device corresponding to the downlink contact network comprises the first sub-voltage, and the second voltage comprises the second sub-voltage.
And the direct current transmitter corresponding to the uplink contact network is used for acquiring a second sub-current of the uplink contact network, detecting a third sub-voltage of the uplink contact network to the rail and detecting a fourth sub-voltage of the uplink contact network to the ground. And sending the second sub-current, the third sub-voltage and the fourth sub-voltage to the direct current traction measurement and control protection device corresponding to the uplink contact network. And the direct current transmitter corresponding to the uplink contact network is also used for sending the second sub-current to the direct current traction measurement and control protection device corresponding to the downlink contact network. The first voltage received by the direct current traction measurement and control protection device corresponding to the uplink contact network comprises the third sub-voltage, and the second voltage comprises the fourth sub-voltage.
The first current received by the direct current traction measurement and control protection device corresponding to the downlink contact network and the uplink contact network comprises the first sub-current and the second sub-current.
Optionally, the direct-current traction measurement and control protection device is connected with the double-side coupled hop device through an optical fiber, and adjacent double-side coupled hop devices are connected through an optical fiber.
Optionally, the direct current transmitter is connected with the direct current traction measurement and control protection device through a cable.
Optionally, the direct current transmitter is connected with the direct current traction measurement and control protection device through an optical fiber.
Optionally, the direct current traction measurement and control protection device is configured to receive, by a ping-pong method, the first current, the first voltage, and the second voltage sent by the double-side gang tripping device in the adjacent substation, which are detected by the direct current transmitter of the local substation.
In a second aspect, an embodiment of the present invention provides a method for locating a fault of an urban rail transit overhead contact system, which is applied to the device for locating a fault of an urban rail transit overhead contact system in the first aspect. The method comprises the following steps:
the direct current traction measurement and control protection device arranged in each transformer substation acquires the first current, the first voltage and the second voltage collected by the direct current transmitters arranged in the transformer substation and other transformer substations.
And the direct current traction measurement and control protection device determines the fault position of the overhead line system according to the first current, the first voltage and the second voltage.
Optionally, the step of determining the fault position of the catenary by the direct-current traction measurement and control protection device according to the first current, the first voltage, and the second voltage includes:
obtaining the equivalent resistance and the equivalent inductance of the overhead line system;
acquiring equivalent resistance and equivalent inductance of a track;
acquiring the length of a fault section;
and the direct current traction measurement and control protection device determines the distance from the fault place of the overhead line system to the direct current traction measurement and control protection device according to the first current, the first voltage, the equivalent resistance and the equivalent inductance of the overhead line system, the equivalent resistance and the equivalent inductance of the track and the length.
Optionally, the step of determining the fault location of the catenary by the direct-current traction measurement and control protection device according to the first current, the first voltage, and the second voltage includes:
obtaining the equivalent resistance and the equivalent inductance of the overhead line system;
acquiring the length of a fault section;
and the direct current traction measurement and control protection device determines the distance from the fault place of the overhead contact system to the direct current traction measurement and control protection device according to the second voltage, the first current, the equivalent resistance and the equivalent inductance of the overhead contact system and the length.
Optionally, the distance between the fault location of the overhead contact system and the direct current traction measurement and control protection device is calculated by the following formula:
and calculating the value of X by using the formula to obtain the distance between the contact network fault point and the direct current traction measurement and control protection device.
The embodiment of the invention provides a device and a method for positioning the fault of an urban rail transit contact network; the device includes: and the direct current transmitter is arranged between the transformer substation and the contact network. The transformer substation is used for supplying power to the contact network; the direct current transmitter is used for detecting a first current of the contact network, detecting a first voltage of the contact network to the rail and detecting a second voltage of the contact network to the ground. And the double-side linked tripping device is connected with the double-side linked tripping device of the adjacent transformer substation. The double-side gang tripping device is used for receiving the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations from the double-side gang tripping device of the adjacent substation. The other substations are used for supplying power to the contact network; the other substations include the adjacent substation. And the direct current traction measurement and control protection device is connected between the direct current transmitter and the double-side coupled tripping device. The direct current traction measurement and control protection device is used for receiving the first current, the first voltage and the second voltage output by the direct current transmitter; and the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations are received from the double-side gang jumping device. The direct current traction measurement and control protection device is further used for determining the position of the contact network fault according to the received first current, the received first voltage and the received second voltage. The fault position can be conveniently and accurately determined.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a structural diagram of an urban rail transit fault locating device provided in an embodiment of the present invention;
fig. 2 is a structural diagram of another urban rail transit fault locating device provided in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a ping-pong method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an equivalent circuit of a catenary to a rail according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an equivalent circuit of a contact network to ground according to an embodiment of the present invention;
fig. 6 is a terminal subgraph of the dc traction measurement and control protection device provided by the embodiment of the invention;
fig. 7 is a schematic diagram of a dual-edge gang jumping device terminal according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a DC transmitter terminal provided by an embodiment of the present invention;
fig. 9 is a block flow diagram provided by an embodiment of the invention.
In the figure: 10-urban rail transit contact network fault positioning device; 100-a direct current transmitter; 200-a direct current traction measurement and control protection device; 300-double side jump device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-2 and fig. 6-8 in combination, an embodiment of the present invention provides a fault location device 10 for an urban rail transit catenary; the method comprises the following steps:
and the direct current transmitter 100 is arranged between the transformer substation and a contact network. The transformer substation is used for supplying power to the contact network; the dc transmitter 100 is configured to detect a first current of the overhead contact system, detect a first voltage of the overhead contact system to the rail, and detect a second voltage of the overhead contact system to the ground.
And the double-side linked-tripping device 300 is connected with the double-side linked-tripping device 300 of the adjacent transformer substation. The double side gang jumping device 300 is configured to receive the first current, the first voltage, and the second voltage detected by the dc transmitter 100 provided in another substation from the double side gang jumping device 300 of the adjacent substation. The other substations are used for supplying power to the contact network; the other substations include the adjacent substation.
And the direct current traction measurement and control protection device 200 is connected between the direct current transmitter 100 and the double-side coupled tripping device 300. The dc traction measurement and control protection device 200 is configured to receive the first current, the first voltage, and the second voltage output by the dc transmitter 100; and for receiving the first current, the first voltage and the second voltage detected by the dc transmitter 100 provided in another substation from the double-sided gang jumping device 300. The direct current traction measurement and control protection device 200 further determines the position of the contact network fault according to the received first current, the received first voltage and the received second voltage.
Optionally, the overhead line system includes an ascending overhead line system and a descending overhead line system. The direct current transmitter 100, the direct current traction measurement and control protection device 200 and the double-side coupled tripping device 300 are arranged between the transformer substation and the uplink contact network and between the transformer substation and the downlink contact network. And the two double-side linked-tripping devices 300 corresponding to the uplink contact network arranged in the same transformer substation are connected with each other. And the two double-side linked-tripping devices 100 corresponding to the downlink contact network arranged in the same transformer substation are connected with each other.
The direct current transmitter 100 corresponding to the downlink contact network is used for collecting a first sub-current of the downlink contact network, detecting a first sub-voltage of the downlink contact network to the rail, and detecting a second sub-voltage of the downlink contact network to the ground. And the first sub-current, the first sub-voltage and the second sub-voltage are sent to the direct current traction measurement and control protection device 200 corresponding to the downlink contact network, and the direct current transmitter 100 corresponding to the downlink contact network is further used for sending the first sub-current to the direct current traction measurement and control protection device 200 corresponding to the uplink contact network. The first voltage received by the direct current traction measurement and control protection device 200 corresponding to the downlink contact network includes the first sub-voltage, and the second voltage includes the second sub-voltage.
The direct current transmitter 100 corresponding to the uplink contact network is used for collecting a second sub-current of the uplink contact network, detecting a third sub-voltage of the uplink contact network to the rail, and detecting a fourth sub-voltage of the uplink contact network to the ground. And sending the second sub-current, the third sub-voltage and the fourth sub-voltage to the direct current traction measurement and control protection device 200 corresponding to the uplink contact network. The direct current transmitter 100 corresponding to the uplink contact network is further configured to send the second sub-current to the direct current traction measurement and control protection device 200 corresponding to the downlink contact network. The first voltage received by the direct current traction measurement and control protection device 200 corresponding to the uplink contact network includes the third sub-voltage, and the second voltage includes the fourth sub-voltage.
The first currents received by the direct-current traction measurement and control protection device 200 corresponding to the downlink contact network and the uplink contact network both include the first sub-current and the second sub-current.
Optionally, the connection relationships among the direct current transmitter 100, the direct current traction measurement and control protection device 200, and the double-side-coupled tripping device 300 in the uplink contact network and the downlink contact network are consistent.
Optionally, in the embodiment of the present invention, taking three substations to supply power to a contact network together as an example, the specific analysis is as follows:
optionally, each direct current traction measurement and control protection device 200 in the urban rail transit overhead line system fault positioning device 10 receives three parts of data, taking the direct current traction measurement and control protection device 200 on the side of the uplink contact network of the station a as an example; the data received by the other dc traction measurement and control protection devices 200 are in the same form. The first part of data received by the direct current traction measurement and control protection device 200 is first part of data (a first sub-current, a first voltage and a second voltage) detected by the direct current transmitter 100 on the uplink side of the station a, the second part of data received by the direct current traction measurement and control protection device 200 is second part of data (a first current, a first voltage and a second voltage detected by the direct current transmitters 100 of other substations, for example, the station B and the station C) acquired by the double-side coupled tripping device 300 on the uplink side of the station a, and the third part of data received by the direct current traction measurement and control protection device 200 is third part of data (a second sub-current) detected by the direct current transmitter 100 on the downlink side of the station a.
Further, the first current received by the dc traction measurement and control protection device 200 on the upstream side of the station a includes a first sub-current and a second sub-current.
Further, the second part of data is data acquired by the double-side linked tripping device 300 on the upstream side of the substation. For example, in the embodiment of the present invention, if there are three substations, the data acquired by the dual-side gang tripping device 300 on the upstream side of the substation is the first current, the first voltage, and the second voltage on the respective sides acquired by the dc traction measurement and control protection devices 200 on the respective upstream sides of the other two substations. It should be noted that the first current refers to a current of a local side catenary monitored by the dc transmitter 100 at the local side of the substation and a catenary current monitored by the dc transmitter 100 at the other side of the substation, the first voltage refers to a voltage of the local side catenary monitored by the dc transmitter 100 at the local side of the substation to a rail, and the second voltage refers to a voltage of the local side catenary monitored by the dc transmitter 100 at the local side of the substation to a ground.
Further, the third part of data is the first current of the catenary on the downstream side monitored by the dc transmitter 100 on the downstream side of the substation.
Further, in the embodiment of the present invention, the number of the substations is three, but in a specific embodiment, the number of the substations may be limited according to specific situations, and is not limited to only three. The manner in which the dc traction measurement and control protection device 200 obtains data is the same.
Optionally, the direct-current traction measurement and control protection device 200 is connected to the double-side coupled hop device 300 through an optical fiber, and adjacent double-side coupled hop devices 300 are connected through an optical fiber.
Further, as shown by the connection of the dotted lines in fig. 1 and fig. 2, optical fiber communication boards may be disposed between the direct current traction measurement and control protection device 200 and the double-side coupled hop device 300, and the optical fiber communication boards are used for optical fiber communication. The arrangement of the optical fiber communication board enables the first current, the first voltage and the second voltage to be transmitted through the optical fiber, so that attenuation is small, and transmission speed is high.
Optionally, the dc transmitter 100 is connected to the dc traction measurement and control protection device 200 through a cable. As shown by the solid line connection in fig. 1.
Further, when the dc transmitter 100 is connected to the dc traction measurement and control protection device 200 through a cable, the cable includes a first cable, a second cable, and a third cable. The first cable and the second cable are connected with the direct current traction measurement and control protection device 200 on the same side, and the third cable is connected with the direct current traction measurement and control protection device 200 on the other side. The first cable transmits a first voltage and a second voltage, and the second cable and the third cable transmit a first current. It should be noted that the first sub-current is a current obtained by the dc transmitter 100 on the first side, and a current transmitted to the dc traction measurement and control protection device 200 on the other side by the current obtained by the dc transmitter 100 on the first side is a second sub-current relative to the dc traction measurement and control protection device 200 on the other side.
Optionally, the dc transmitter 100 and the dc traction measurement and control protection device 200 may also be connected by an optical fiber (as shown by a dashed connection in fig. 2). The optical fiber connection is that the dc transmitter 100 and the dc traction measurement and control protection device 200 on the same side can be connected through an optical fiber; meanwhile, in the same transformer substation, the direct current transmitter 100 on the upstream side and the direct current traction measurement and control protection device 200 on the downstream side can also be connected through optical fibers. Similarly, the dc transmitter 100 on the downstream side and the dc traction measurement and control protection device 200 on the upstream side may also be connected by an optical fiber.
It should be further noted that, in the implementation of the present invention, the first current obtained by the dc traction measurement and control protection device 200 includes two parts of current, one part is a first sub-current detected by the dc transmitter 100 on the current side and opposite to the catenary on the current side, and the other part is a second sub-current detected by the dc transmitter 100 on the other side and opposite to the catenary on the other side.
Optionally, in an embodiment of the present invention, the direct current traction measurement and control protection device 200 is configured to receive, by a ping-pong method, the first current, the first voltage, and the second voltage, which are detected by the direct current transmitter 100 of the local substation and sent by the double-side gang tripping device 300 in the adjacent substation. The synchronous data are obtained in such a way, so that the accuracy of the calculation result is improved, and the specific position of the fault is judged more accurately.
Referring to fig. 3, in an embodiment of the present invention, the synchronization data is obtained by selecting the dc transmitter 100 as a time reference terminal and setting it as a master station. The direct current traction measurement and control protection device 200 on the other contact net directly connected with the direct current traction measurement and control protection device is set as a substation. The master station and the slave station are provided for the convenience of sampling time synchronization. The time synchronization is performed using one data frame reception time. In order to perform time synchronization of the substation, the master station transmits a time signal to the substation and the sampling time of the substation relay is synchronized with the substation reception time; the detected data can be used for calculating the specific position of the fault by a fault positioning method of the rail transit.
Further, the manner of acquiring the synchronous data may be that the master station sends a time instruction to the slave station, that is, when one of the dc traction measurement and control protection devices 200 collects data, a command is sent to the other dc traction measurement and control protection devices 200, and the other dc traction measurement and control protection devices 200 collect corresponding data based on the command. The corresponding data is corresponding first current, first voltage and second voltage collected by each of the other direct current traction measurement and control protection devices 200.
Fig. 6 is a terminal diagram of the dc traction measurement and control protection device 200 according to the embodiment of the present invention. The interface can comprise an A terminal (analog quantity access terminal), a B terminal (open terminal), a C terminal (communication terminal), a D terminal (power terminal), a 2-path Ethernet interface, a 2-path optical fiber interface, a 2-path USB interface and a 1-path B code pair interface.
Fig. 7 shows a terminal sub-diagram of a dual-edge serial-trip device 300 according to an embodiment of the present invention. The method can comprise the following steps: the device comprises a 1-path power supply terminal, 1 grounding terminal, a 1-path 458 communication terminal, 2 groups of 8-path open-in terminals, 2 groups of 8-path open-out terminals, a 1-path alarm indication terminal and a 2-path size double-side switching indication terminal.
Fig. 8 is a terminal diagram of the dc transmitter 100 according to the embodiment of the present invention. Can include 1 way power interface, 1 way 458 communication, 8 relays, 3 voltage output, 5 electric current output interfaces.
The working principle of the urban rail transit positioning device provided by the embodiment of the invention is as follows:
the direct current transmitter detects current and voltage information of an urban rail transit overhead line system and sends the detected current and voltage information to the direct current traction measurement and control protection device on the same side of the transformer substation; the direct current traction measurement and control protection device also receives current and voltage information of the bilateral coupling tripping device on the same side of the transformer substation and current information detected by the direct current transmitter on the other side of the transformer substation. The data received by each direct current traction measurement and control protection device on the upstream side in the urban rail transit positioning device is the same, and the data received by each direct current traction measurement and control protection device on the downstream side in the urban rail transit positioning device is also the same. And each direct current traction measurement and control protection device of the urban rail transit positioning device accurately positions the fault according to a fault positioning algorithm.
The embodiment of the invention provides a fault positioning device for an urban rail transit contact network; the method comprises the following steps: and the direct current transmitter is arranged between the transformer substation and the contact network. The transformer substation is used for supplying power to the contact network; the direct current transmitter is used for detecting a first current of the contact network, detecting a first voltage of the contact network to the rail and detecting a second voltage of the contact network to the ground. And the double-side linked tripping device is connected with the double-side linked tripping device of the adjacent transformer substation. The double-side gang tripping device is used for receiving the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations from the double-side gang tripping device of the adjacent substation. The other substations are used for supplying power to the contact network; the other substations include the adjacent substation. And the direct current traction measurement and control protection device is connected between the direct current transmitter and the double-side coupled tripping device. The direct current traction measurement and control protection device is used for receiving the first current, the first voltage and the second voltage output by the direct current transmitter; and the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations are received from the double-side gang jumping device. The direct current traction measurement and control protection device is further used for determining the position of the contact network fault according to the received first current, the received first voltage and the received second voltage. The fault position can be conveniently and accurately determined.
Referring to fig. 9, an embodiment of the present invention provides a method for locating a fault of an urban rail transit overhead contact system, which is applied to the device for locating a fault of an urban rail transit overhead contact system in the first aspect. The method comprises the following steps:
s400: the direct current traction measurement and control protection device arranged in each transformer substation acquires the first current, the first voltage and the second voltage collected by the direct current transmitters arranged in the transformer substation and other transformer substations.
S500: and the direct current traction measurement and control protection device obtains the specific position of the rail transit power grid fault through fault positioning algorithm processing according to the first current, the first voltage and the second voltage.
In an embodiment of the present invention, the step of determining the fault location of the catenary by the dc traction measurement and control protection device according to the first current, the first voltage, and the second voltage includes:
obtaining the equivalent resistance and the equivalent inductance of the overhead line system;
acquiring the length of a fault section;
and the direct current traction measurement and control protection device determines the distance from the fault place of the overhead contact system to the direct current traction measurement and control protection device according to the second voltage, the first current, the equivalent resistance and the equivalent inductance of the overhead contact system and the length.
Optionally, the distance between the fault location of the overhead contact system and the direct current traction measurement and control protection device is calculated by the following formula:
and calculating the value of X by using the formula to obtain the distance between the contact network fault point and the direct current traction measurement and control protection device.
Further, the process of obtaining the equivalent circuit is as follows:
referring to fig. 4, the uplink and downlink catenary between the m end and the n end of the power supply interval is equivalent to two catenary equivalent circuits connected in parallel, the length is D, the two ends are the a node and the b node, and Rc and Lc are the resistance and inductance of the catenary equivalent circuit respectively.
Similarly, a steel rail between the m end and the n end of the power supply section is equivalent to a steel rail equivalent line, the length is D, the two ends are the m end and the n end, and Rr and Lr are respectively resistance and inductance of the steel rail equivalent line.
The m-end power supply system comprises an Uqm, a Reqm and a Leqm which are sequentially connected in series, wherein the Leqm end and the Uqm end are respectively connected with a node a of an equivalent circuit of a contact network and the m end of an equivalent circuit of a steel rail;
the n-end power supply system comprises an Ueqn, a Reqn and a Leqn which are sequentially connected in series, wherein the Leqn end and the Ueqn end are respectively connected with a b node of the equivalent circuit of the overhead contact system and the n end of the equivalent circuit of the steel rail.
Wherein: ueqm, Reqm and Leqm are power supply, internal resistance and internal inductance of the m-end power supply system; ueqn, Reqn and Leqn are the power supply, internal resistance and internal inductance of the n-terminal power supply system.
Further, in the embodiment of the present invention, a specific detection method is provided for the equivalent circuit diagram of the overhead contact system to the rail. A mutual contact fault occurs between an equivalent circuit of an ascending or descending contact network and an equivalent circuit of a track, the fault point of the equivalent circuit of the contact network is c, and the fault point of the equivalent circuit of the steel rail is d; and the transition resistance between points c and d is Rf.
x is the ratio of the distance between the c point (or d) of the fault point and the a node to the length of the fault interval (order is 1), then: the equivalent line resistance and inductance of the contact network from the node a to the point c are respectively xRc and xLc; the equivalent line resistance and inductance of the contact network at the point c and the point b are respectively (1-x) Rc and (1-x) Lc. The resistance and the inductance of the equivalent circuit of the steel rail from the node a to the point c are x Rr and xLr respectively; the resistance and the inductance of the equivalent line of the steel rail with the c point and the b node are respectively (1-x) Rr and (1-x) Lr.
The algorithm after adding the permutation is as formula (1) according to kirchhoff's second law, loop 1 in fig. 4, where: x is the distance from the fault point to the side of the measuring device; d is the length of the fault interval.
In the above formula (1), i1、i2Is the first loop current; i.e. i3Is the second loop branch current.
According to kirchhoff's second law, loop 2 in fig. 4, the algorithm after arrangement is added as formula (2), that is: and (4) ranging by using a contact net and ranging the contact net and the steel rail. In the formula: x is the distance from the fault point to the side of the measuring device; d is the length of the fault interval.
In the above formula (2), i 3' is the loop current of the second loop.
Referring to fig. 5, the uplink and downlink catenary between the m end and the n end of the power supply interval is equivalent to two catenary equivalent circuits connected in parallel, the length is D, the two ends are the a node and the b node, and Rc and Lc are the resistance and inductance of the catenary equivalent circuit respectively.
The m-end power supply system comprises an Uqm, a Reqm and a Leqm which are sequentially connected in series, wherein the Leqm end and the Uqm end are respectively connected with a node a of an equivalent circuit of a contact network and grounded.
The n-end power supply system comprises an Ueqn, a Reqn and a Leqn which are sequentially connected in series, and the Leqn end and the Ueqn end are respectively connected with a node b of an equivalent circuit of the overhead line system and grounded.
Wherein: ueqm, Reqm and Leqm are power supply, internal resistance and internal inductance of the m-end power supply system.
Ueqn, Reqn and Leqn are the power supply, internal resistance and internal inductance of the n-terminal power supply system. Further, the embodiment of the invention provides a specific detection method for the contact network ground equivalent circuit diagram.
And (3) generating a ground fault between the equivalent circuit of the uplink or downlink contact network and the ground, wherein the fault point is c.
The added algorithm is shown in formula (3) by using the contact net to measure the distance with the ground. In the formula: x is the distance from the fault point to the side of the measuring device; d is the length of the fault interval.
I in the above 3 formulae1、i2、i3、i3', u + -1, u + -2, u + GND1 and u + GND2 are the same as those in the above-mentioned device configuration (with the station A upstream side DC transmitter 100 and the station B left upstream side DC transmitter 100, the current collected by the station A upstream side DC transmitter 100 is i1For example, the rest of the intervals are analogized as follows): i.e. i1Is the current i collected by the station A uplink side DC transmitter 1001、i2Is the current i collected by the DC transmitter 100 at the left upstream side of the station B1、i3Is the current i collected by the station A downstream side DC transmitter 1003' is the current collected by the station B left downstream side DC transmitter 100, u + -1 is the voltage collected by the station A DC transmitter 100, and u + -2 is the current collected by the station B left upstream side DC transmitter 100U + GND1 is the voltage collected by the a-station dc transmitter 100, and u + GND2 is the voltage u + GND collected by the B-station left upstream side dc transmitter 100. D can be obtained by measuring the contact line length. RC, LC, Rr and Lr can be obtained by field test.
The embodiment of the invention provides a method for positioning a fault of an urban rail transit contact network, which is applied to the device 10 for positioning the fault of the urban rail transit contact network in the first aspect. The method comprises the following steps:
the direct current traction measurement and control protection device 200 arranged in each substation acquires the first current, the first voltage and the second voltage collected by the direct current transmitters 100 arranged in the substation and other substations.
And the direct current traction measurement and control protection device 200 obtains the specific position of the rail transit power grid fault through fault positioning algorithm processing according to the first current, the first voltage and the second voltage. The specific position of the fault can be quickly and accurately found, and the efficiency of traffic transportation is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an urban rail transit contact net fault locating device which characterized in that includes:
the direct current transmitter is arranged between the transformer substation and the contact network; the transformer substation is used for supplying power to the contact network; the direct current transmitter is used for detecting a first current of the overhead line system, detecting a first voltage of the overhead line system to a rail and detecting a second voltage of the overhead line system to the ground;
the double-side linked tripping device is connected with the double-side linked tripping devices of the adjacent transformer substations; the double-side gang tripping device is used for receiving the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations from the double-side gang tripping device of the adjacent substation, and the other substations are used for supplying power to the contact network; the other substations including the adjacent substation;
the direct-current traction measurement and control protection device is connected between the direct-current transmitter and the double-side coupled tripping device and is used for receiving the first current, the first voltage and the second voltage output by the direct-current transmitter; the double-side gang jumping device is used for receiving the first current, the first voltage and the second voltage detected by the direct current transmitters arranged in other substations; the direct current traction measurement and control protection device is further used for determining the position of the contact network fault according to the received first current, the received first voltage and the received second voltage;
the direct current traction measurement and control protection device is further used for determining the position of the contact network fault according to the received first current, the received first voltage and the received second voltage in a mode that:
obtaining the equivalent resistance and the equivalent inductance of the overhead line system;
acquiring the length of a fault section;
determining the distance from the fault point of the overhead contact system to the direct current traction measurement and control protection device according to the second voltage, the first current, the equivalent resistance and the equivalent inductance of the overhead contact system and the length;
specifically, the distance between the fault location of the overhead contact system and the direct current traction measurement and control protection device is calculated according to the following formula:
wherein X is the distance, D is the length, Rc and Lc are respectively the resistance and the inductance of the equivalent circuit of the contact network, i1And i2Current, u, collected for DC transmitters at different sites+GND1And u+GND2Voltages respectively collected by DC transmitters of different stations are utilizedAnd calculating the X value according to the formula to obtain the distance between the contact network fault point and the direct current traction measurement and control protection device.
2. The device of claim 1, wherein the overhead line system comprises an uplink overhead line system and a downlink overhead line system, and the direct current transmitter, the direct current traction measurement and control protection device and the double-side gang tripping device are arranged between the substation and the uplink overhead line system and between the substation and the downlink overhead line system; the two ganged tripping devices corresponding to the uplink contact network arranged in the same transformer substation are connected with each other;
the direct current transmitter corresponding to the downlink contact network is used for acquiring a first sub-current of the downlink contact network, detecting a first sub-voltage of the downlink contact network to a track and detecting a second sub-voltage of the downlink contact network to the ground, and sending the first sub-current, the first sub-voltage and the second sub-voltage to the direct current traction measurement and control protection device corresponding to the downlink contact network, and the direct current transmitter corresponding to the downlink contact network is also used for sending the first sub-current to the direct current traction measurement and control protection device corresponding to the uplink contact network; the first voltage received by the direct-current traction measurement and control protection device corresponding to the downlink contact network comprises the first sub-voltage, and the second voltage comprises the second sub-voltage;
the direct current transmitter corresponding to the uplink contact network is used for acquiring a second sub-current of the uplink contact network, detecting a third sub-voltage of the uplink contact network to a track and detecting a fourth sub-voltage of the uplink contact network to the ground, and sending the second sub-current, the third sub-voltage and the fourth sub-voltage to the direct current traction measurement and control protection device corresponding to the uplink contact network, and the direct current transmitter corresponding to the uplink contact network is also used for sending the second sub-current to the direct current traction measurement and control protection device corresponding to the downlink contact network; the first voltage received by the direct-current traction measurement and control protection device corresponding to the uplink contact network comprises the third sub-voltage, and the second voltage comprises the fourth sub-voltage;
the first current received by the direct current traction measurement and control protection device corresponding to the downlink contact network and the uplink contact network comprises the first sub-current and the second sub-current.
3. The device according to claim 1, wherein the direct current traction measurement and control protection device is connected with the double-side-coupled-hop devices through optical fibers, and adjacent double-side-coupled-hop devices are connected through optical fibers.
4. The device of claim 3, wherein the DC transmitter is connected with the DC traction measurement and control protection device through a cable.
5. The device of claim 3, wherein the DC transducer is connected with the DC traction measurement and control protection device through an optical fiber.
6. The device of claim 1, wherein the direct current traction measurement and control protection device is configured to receive the first current, the first voltage and the second voltage sent by the double-side gang-tripping device in the adjacent substation, which are detected by the direct current transmitter of the local substation, through a ping-pong method.
7. The method for locating the fault of the urban rail transit contact network is applied to the device as claimed in claim 1, and is characterized by comprising the following steps:
the direct current traction measurement and control protection device arranged in each transformer substation acquires the first current, the first voltage and the second voltage collected by the direct current transmitters arranged in the transformer substation and other transformer substations;
obtaining the equivalent resistance and the equivalent inductance of the overhead line system;
acquiring the length of a fault section;
the direct current traction measurement and control protection device determines the distance from the fault location of the overhead contact system to the direct current traction measurement and control protection device according to the second voltage, the first current, the equivalent resistance and the equivalent inductance of the overhead contact system and the length;
calculating the distance between the fault location of the overhead contact system and the direct current traction measurement and control protection device according to the following formula:
substituting the acquired data into the formula:
wherein X is the distance, D is the length, Rc and Lc are respectively the resistance and the inductance of the equivalent circuit of the contact network, i1And i2Current, u, collected for DC transmitters at different sites+GND1And u+GND2And respectively calculating X values for the voltages collected by the direct current transmitters at different stations by using the formula to obtain the distance between the contact network fault point and the direct current traction measurement and control protection device.
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| CN110244182B (en) * | 2019-06-28 | 2021-05-18 | 国电南瑞南京控制系统有限公司 | Fault positioning method and system suitable for electrified railway multi-branch line |
| CN110501560A (en) * | 2019-08-30 | 2019-11-26 | 广州市扬新技术研究有限责任公司 | Orbit traffic direct current transmitter digitalizer based on fiber optic communication |
| CN110579686B (en) * | 2019-09-12 | 2021-10-29 | 池代臻 | Fault testing method and fault testing circuit of rail contact network |
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Inventor after: Chen Cansen Inventor after: Xie Weijia Inventor after: Chen Jiahui Inventor after: Xue Feipin Inventor after: Chang Baobo Inventor after: Wang Weibin Inventor after: Zeng Binhua Inventor after: Yang Zhiwei Inventor after: Zheng Changquan Inventor after: Ye Zhibing Inventor after: Cao Jinbin Inventor after: Hu Minhua Inventor before: Chen Cansen Inventor before: Chang Baobo Inventor before: Wang Weibin Inventor before: Zeng Binhua Inventor before: Yang Zhiwei Inventor before: Zheng Changquan Inventor before: Ye Zhibing |