A line optical fiber differential protection device with traveling wave ranging function

Abstract

The present application discloses a line optical fiber differential protection device with a traveling wave ranging function, including an input plug-in and an output plug-in; a traveling wave acquisition plug-in for collecting the traveling wave signal on this side; a first data processing component for sending the traveling wave signal on this side to the opposite side through an optical fiber channel and receiving the traveling wave signal on the opposite side and transmitting the traveling wave signal on this side and the traveling wave signal on the opposite side to a second data processing component; the second data processing component is used to calculate the position of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side. The line optical fiber differential protection device can overcome the limitations of the feasibility of traveling wave ranging and realize traveling wave ranging locally. The present application also discloses a method for locating a fault point on a transmission line, which also has the above-mentioned technical effects.

Description

Technical Field

[0001] The present application relates to the technical field of fault location of power systems, and in particular to a line optical fiber differential protection device with a traveling wave ranging function; and also to a method for locating a fault point of a transmission line. Background Art

[0002] In order to improve the fault location accuracy of the line, traveling wave ranging is usually used to locate the fault point. At present, the ways to achieve traveling wave ranging include using an independent traveling wave ranging device for traveling wave ranging or using the station-to-station communication of the transmission line differential protection to complete the traveling wave ranging by the master station, while the traditional line optical fiber differential protection device performs impedance ranging locally. The former requires the installation of an additional traveling wave ranging device, which leads to a high cost for fault location. The latter requires the master station to complete the traveling wave ranging, which limits the feasibility of traveling wave ranging. Usually, in power stations below 110kv, many power stations do not have the conditions to be equipped with a master station. For such power stations without a master station, traveling wave ranging cannot be performed.

[0003] Therefore, how to overcome the feasibility limitations of traveling wave ranging and implement traveling wave ranging locally has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present application is to provide a line optical fiber differential protection device with a traveling wave ranging function, which can overcome the limitations of the feasibility of traveling wave ranging and realize traveling wave ranging locally; another purpose of the present application is to provide a method for locating a fault point of a transmission line, which also has the above-mentioned technical effects.

[0005] In order to solve the above technical problems, the present application provides a line optical fiber differential protection device with a traveling wave ranging function, comprising:

[0006] Open the plug-in, open the plug-in;

[0007] Traveling wave acquisition plug-in, used to collect the traveling wave signal on this side;

[0008] a first data processing component, configured to send the traveling wave signal on the local side to the opposite side and receive the traveling wave signal on the opposite side through the optical fiber channel and transmit the traveling wave signal on the local side and the traveling wave signal on the opposite side to the second data processing component;

[0009] The second data processing component is used to calculate the position of the fault point according to the traveling wave signal on the local side and the traveling wave signal on the opposite side.

[0010] Optionally, the traveling wave acquisition plug-in includes:

[0011] A traveling wave sensor, used for collecting traveling wave signals;

[0012] A first processor, used for processing the traveling wave signal to obtain a traveling wave signal with a time mark;

[0013] The second processor is used to convert the traveling wave signal with a time mark into a transmission signal frame of the internal standard of the line optical fiber differential protection device.

[0014] Optionally, the first data processing component is further used to obtain the location information of the fault point by impedance ranging and transmit the location information to the second data processing component.

[0015] Optionally, the first data processing component includes:

[0016] An optical fiber transceiver interface, used to send the traveling wave signal on the local side to the opposite side and receive the traveling wave signal on the opposite side;

[0017] The microprocessor is used for decoding the traveling wave signal on the opposite side and transmitting the decoded traveling wave signal on the opposite side and the traveling wave signal on the local side to the second data processing component.

[0018] Optionally, the microprocessor is specifically a DSP processor.

[0019] Optionally, the first data processing component is also used to perform impedance ranging and transmit the impedance ranging result to the second data processing component.

[0020] Optionally, also include:

[0021] A display is used to receive and display the location of the fault point.

[0022] Optionally, the traveling wave acquisition plug-in, the input plug-in and the output plug-in are all connected to the first data processing component via a CAN bus.

[0023] Optionally, the second data processing component is further provided with an Ethernet interface to send the location of the fault point to a monitoring background via the Ethernet interface.

[0024] In order to solve the above technical problems, the present application also provides a method for locating a fault point of a power transmission line, which is applied to the line optical fiber differential protection device with a traveling wave ranging function as described above, comprising:

[0025] Collect the traveling wave signal on this side;

[0026] Sending the traveling wave signal on the local side to the opposite side and receiving the traveling wave signal on the opposite side through the optical fiber channel;

[0027] The position of the fault point is calculated according to the traveling wave signal on the local side and the traveling wave signal on the opposite side.

[0028] Optionally, also include:

[0029] The location of the fault point is sent to the monitoring background via Ethernet.

[0030] The line optical fiber differential protection device with traveling wave ranging function provided in the present application includes an input plug-in and an output plug-in; a traveling wave acquisition plug-in for acquiring the traveling wave signal on this side; a first data processing component for sending the traveling wave signal on this side to the opposite side through an optical fiber channel and receiving the traveling wave signal on the opposite side and transmitting the traveling wave signal on this side and the traveling wave signal on the opposite side to a second data processing component; the second data processing component is used to calculate the position of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side.

[0031] Different from an independent traveling wave ranging device and a main station for realizing traveling wave ranging, the line optical fiber differential protection device provided in the present application can utilize the traveling wave acquisition plug-in therein to collect the traveling wave signal on this side on the basis of realizing the traditional differential protection function, that is, to collect the traveling wave signal locally where the line optical fiber differential protection device is installed, and further realize double-end data sharing with the help of the communication link based on sampling time synchronization of the optical fiber channel, send the traveling wave signal on this side to the opposite side and receive the traveling wave signal on the opposite side, and then locate the position of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side, so as to effectively overcome the limitation of the feasibility of traveling wave ranging and realize the purpose of performing traveling wave ranging locally.

[0032] The method for locating fault points of power transmission lines provided in this application also has the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the prior art and the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of a line optical fiber differential protection device with a traveling wave ranging function provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of a traveling wave acquisition plug-in provided in an embodiment of the present application;

[0036] Figure 3 A schematic flow chart of a method for locating a fault point in a power transmission line provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The core of this application is to provide a line optical fiber differential protection device with a traveling wave ranging function, which can overcome the limitations of the feasibility of traveling wave ranging and realize traveling wave ranging locally; another core of this application is to provide a method for locating the fault point of a transmission line, which also has the above-mentioned technical effects.

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Please refer to Figure 1 , Figure 1 A schematic diagram of a line optical fiber differential protection device with a traveling wave ranging function provided in an embodiment of the present application; Figure 1 As shown, the line optical fiber differential protection device includes: an input plug-in 10, an output plug-in 20; a traveling wave acquisition plug-in 30, used to collect the traveling wave signal on this side; a first data processing component 40, used to send the traveling wave signal on this side to the opposite side through the optical fiber channel and receive the traveling wave signal on the opposite side and transmit the traveling wave signal on this side and the traveling wave signal on the opposite side to the second data processing component 50; the second data processing component 50, used to calculate the position of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side.

[0040] Specifically, compared with the traditional line fiber optic differential protection device, the line fiber optic differential protection device provided in the present application is additionally provided with a traveling wave acquisition plug-in 30, so as to realize the purpose of traveling wave acquisition and traveling wave ranging in the local area where the line fiber optic differential protection device is installed while realizing the traditional differential protection function. It mainly includes an input plug-in 10, an output plug-in 20, a traveling wave acquisition plug-in 30, a first data processing component 40 and a second data processing component 50.

[0041] Specifically, the input plug-in 10 is used to collect switch quantities. The output plug-in 20 is used to output switch quantities to control the state of related equipment, for example, to control the on or off of a relay, etc. The specific structure of the input plug-in 10 and the output plug-in 20 is not described in detail in this application, and reference can be made to the relevant description of the prior art. In addition, the line optical fiber differential protection device provided in this application can also collect power frequency analog quantities to realize the traditional differential protection function.

[0042] The traveling wave acquisition plug-in 30 is responsible for locally acquiring the traveling wave signal, that is, acquiring the traveling wave signal on this side, and further transmitting the acquired traveling wave signal to the first data processing component 40 via the bus.

[0043] Among them, reference Figure 2 As shown, in a specific embodiment, the traveling wave acquisition plug-in 30 includes a traveling wave sensor for collecting traveling wave signals; a first processor for processing the traveling wave signals to obtain traveling wave signals with time stamps; and a second processor for converting the traveling wave signals with time stamps into standard transmission signal frames within the line optical fiber differential protection device.

[0044] Specifically, the traveling wave sensor is responsible for collecting the traveling wave signal of the fault when a fault occurs in the transmission line. Further, the traveling wave signal collected by the traveling wave sensor reaches the first processor, and the first processor processes the traveling wave signal to form a traveling wave signal with a time stamp. Finally, the second processor converts and processes the traveling wave signal with a time stamp, converting it into a standard transmission signal frame inside the line optical fiber differential protection device to complete the collection of the traveling wave signal, and then the traveling wave signal can be further transmitted to the first data processing component 40 through the bus. It can be understood that in actual application, the traveling wave sensor is installed on the transmission line.

[0045] In addition, in a specific embodiment, the traveling wave acquisition plug-in 30, the input plug-in 10 and the output plug-in 20 are all connected to the first data processing component 40 via the CAN bus. Thus, the traveling wave signal collected by the traveling wave acquisition plug-in 30 is transmitted to the first data processing component 40 via the CAN bus. The input plug-in 10 and the output plug-in 20 also transmit data with the first data processing component 40 via the CAN bus, transmit the collected power frequency analog quantity and switch quantity to the first data processing component 40, and receive the switch quantity output by the first data processing component 40.

[0046] After the first data processing component 40 receives the traveling wave signal of the local side collected by the traveling wave acquisition plug-in 30, on the one hand, the traveling wave signal of the local side collected by the traveling wave acquisition plug-in 30 is sent to the opposite side (the local side is relative to the opposite side) through the optical fiber channel, and on the other hand, the traveling wave signal of the local side collected by the traveling wave acquisition plug-in 30 and the traveling wave signal of the opposite side received by the first data processing component 40 through the optical fiber channel are transmitted to the second data processing component 50 through the high-speed bus inside the device, so that the second data processing component 50 further calculates the position of the fault point according to the traveling wave signal of the local side and the traveling wave signal of the opposite side. Among them, for locating the position of the fault point based on the traveling wave signals on both sides, that is, calculating the distance of the fault point, reference can be made to the existing related traveling wave ranging algorithm, which will not be repeated in this application.

[0047] In a specific embodiment, the first data processing component 40 includes an optical fiber transceiver interface for receiving the traveling wave signal from the opposite side and sending the traveling wave signal from this side to the opposite side; a microprocessor for decoding the traveling wave signal from the opposite side and transmitting the decoded traveling wave signal from the opposite side and the traveling wave signal from this side to the second data processing component 50.

[0048] Specifically, the optical fiber transceiver unit is used to receive the traveling wave signal of the opposite side acquired by the line optical fiber differential acquisition device of the opposite side on the opposite side through the optical fiber channel, and send the traveling wave signal of the local side acquired by the line optical fiber differential acquisition device of the local side to the opposite side. The microprocessor is used to decode the received traveling wave signal of the opposite side and further transmit the decoded traveling wave signal of the opposite side to the second data processing component 50.

[0049] Among them, as a specific implementation, the above-mentioned microprocessor can be specifically a DSP processor. Of course, in addition to the specific types of the above-mentioned microprocessors, other types of microprocessors can also be selected, such as ARM processors, etc., and this application does not make a sole limitation on this, and can be set differently according to actual needs.

[0050] Furthermore, in a specific implementation, the first data processing component 40 is also used to perform impedance ranging and transmit the result of the impedance ranging to the second data processing component 50 .

[0051] Specifically, while using the second data processing component 50 to calculate the position of the fault point based on the traveling wave signal on this side and the traveling wave signal on the opposite side to realize traveling wave ranging, this embodiment further uses the first data processing component 40 to perform impedance ranging, and transmits the impedance ranging result, that is, the position of the fault point obtained by impedance ranging to the second data processing component 50, so that the second data processing component 50 can perform a comprehensive analysis of the position of the fault point obtained by impedance ranging and the position of the fault point obtained by traveling wave ranging, and then locate the fault point more accurately, so as to avoid the influence of the loss of traveling wave signal or inaccurate impedance ranging on the fault point positioning result in a single traveling wave ranging.

[0052] Similarly, for the specific implementation of impedance ranging, reference may be made to the existing related impedance ranging algorithms, which will not be elaborated in this application.

[0053] Furthermore, in order to improve the integration of the line optical fiber differential protection device structure, the first data processing component 40 and the second data processing component 50 can also be integrated into one, that is, one functional component is used to complete the functions of both the first data processing component 40 and the second data processing component 50.

[0054] Furthermore, in a specific embodiment, the line optical fiber differential protection device further includes a display for receiving and displaying the position of the fault point. Thus, after the first data processing component 40 calculates the position of the fault point based on the traveling wave signal on the local side and the traveling wave signal on the opposite side, the position data of the fault point can be output to the display for display, so as to facilitate relevant personnel to obtain the position information of the fault point in a timely manner.

[0055] Further, based on the above embodiment, as a specific implementation method, the second data processing component 50 is also provided with an Ethernet interface to send the location of the fault point to the monitoring background through the Ethernet interface, so as to facilitate the relevant personnel at the monitoring background to understand the location of the fault point. In addition, the monitoring background can also send control instructions to the second data processing component 50 through Ethernet, so that the line optical fiber differential protection device performs corresponding operations and realizes remote monitoring.

[0056] In summary, the line optical fiber differential protection device with traveling wave ranging function provided in the present application includes an input plug-in and an output plug-in; a traveling wave acquisition plug-in for acquiring the traveling wave signal on this side; a first data processing component for sending the traveling wave signal on this side to the opposite side through an optical fiber channel and receiving the traveling wave signal on the opposite side and transmitting the traveling wave signal on this side and the traveling wave signal on the opposite side to the second data processing component; and a second data processing component for calculating the position of the fault point based on the traveling wave signal on this side and the traveling wave signal on the opposite side. The line optical fiber differential protection device, on the basis of realizing the traditional differential protection function, can use the traveling wave acquisition plug-in therein to collect the traveling wave signal on this side, that is, collect the traveling wave signal locally when the line optical fiber differential protection device is installed, and further realize double-end data sharing with the help of the communication link based on sampling time synchronization of the optical fiber channel, send the traveling wave signal on this side to the opposite side and receive the traveling wave signal on the opposite side, and then locate the position of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side, so as to effectively overcome the limitation of the feasibility of traveling wave ranging and realize the purpose of local traveling wave ranging.

[0057] The present application also provides a method for locating a fault point of a power transmission line. The method described below can be referred to in correspondence with the device described above. Figure 3 , Figure 3 A schematic diagram of a method for locating a fault point of a power transmission line provided in an embodiment of the present application; the method for locating a fault point of a power transmission line is applied to the above-mentioned line optical fiber differential protection device with traveling wave ranging function, combined with Figure 3 , the transmission line fault point locating method comprises:

[0058] S101: collecting the traveling wave signal on this side;

[0059] S102: sending the traveling wave signal on the local side to the opposite side and receiving the traveling wave signal on the opposite side through the optical fiber channel;

[0060] S103: Calculate the location of the fault point according to the traveling wave signal on the local side and the traveling wave signal on the opposite side.

[0061] Specifically, the traveling wave acquisition plug-in in the line optical fiber differential protection device collects the traveling wave signal on this side and transmits the traveling wave signal on this side to the first data processing component. The first data processing component receives the traveling wave signal on this side collected by the traveling wave acquisition plug-in and further transmits the traveling wave signal on this side to the opposite side through the optical fiber channel and transmits the traveling wave signal on this side and the traveling wave signal on the opposite side received through the optical fiber channel to the second data processing component, so that the second data processing component calculates the location of the fault point according to the traveling wave signal on this side and the traveling wave signal on the opposite side.

[0062] Based on the above embodiment, as a specific implementation method, it may also include:

[0063] The location of the fault point is sent to the monitoring background via Ethernet.

[0064] Because the situation is complicated, it is impossible to list them one by one for explanation. Those skilled in the art should be able to realize that there may be multiple examples based on the basic principles of the embodiments provided in this application and combined with actual conditions, and they should all be within the scope of this application without paying enough creative work.

[0065] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above is a detailed introduction to the line optical fiber differential protection device with traveling wave ranging function and the method for locating the fault point of a transmission line provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0067] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

Claims

1. A line optical fiber differential protection device with traveling wave ranging function, characterized in that: include: Open the plug-in, open the plug-in; Traveling wave acquisition plug-in, used to collect the traveling wave signal on this side; a first data processing component, configured to send the traveling wave signal on the local side to the opposite side and receive the traveling wave signal on the opposite side through the optical fiber channel and transmit the traveling wave signal on the local side and the traveling wave signal on the opposite side to the second data processing component; The second data processing component is used to calculate the position of the fault point according to the traveling wave signal on the local side and the traveling wave signal on the opposite side; The traveling wave acquisition plug-in comprises: A traveling wave sensor, used for collecting traveling wave signals; A first processor, used for processing the traveling wave signal to obtain a traveling wave signal with a time mark; A second processor, used for converting the time-stamped traveling wave signal into a transmission signal frame of an internal standard of the line optical fiber differential protection device; The first data processing component comprises: An optical fiber transceiver interface, used to send the traveling wave signal on the local side to the opposite side and receive the traveling wave signal on the opposite side; The microprocessor is used for decoding the traveling wave signal on the opposite side and transmitting the decoded traveling wave signal on the opposite side and the traveling wave signal on the local side to the second data processing component.

2. The line optical fiber differential protection device according to claim 1, characterized in that: The microprocessor is specifically a DSP processor.

3. The line optical fiber differential protection device according to claim 2, characterized in that: The first data processing component is also used to perform impedance ranging and transmit the impedance ranging result to the second data processing component.

4. The line optical fiber differential protection device according to claim 3, characterized in that: Also includes: A display is used to receive and display the location of the fault point.

5. The line optical fiber differential protection device according to claim 4, characterized in that: The traveling wave acquisition plug-in, the input plug-in and the output plug-in are all connected to the first data processing component via a CAN bus.

6. The line optical fiber differential protection device according to claim 5, characterized in that: The second data processing component is also provided with an Ethernet interface, so as to send the location of the fault point to the monitoring background through the Ethernet interface.

7. A method for locating a fault point of a power transmission line, characterized in that: A line optical fiber differential protection device with a traveling wave ranging function as claimed in any one of claims 1 to 6, comprising: Collect the traveling wave signal on this side; Sending the traveling wave signal on the local side to the opposite side and receiving the traveling wave signal on the opposite side through the optical fiber channel; The position of the fault point is calculated according to the traveling wave signal on the local side and the traveling wave signal on the opposite side.

8. The method for locating a fault point of a power transmission line according to claim 7, characterized in that: Also includes: The location of the fault point is sent to the monitoring background via Ethernet.

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