Monitoring terminal for determining fault position

Abstract

The invention provides a monitoring terminal for determining a fault location, the monitoring terminal is used for a distribution line, and the monitoring terminal comprises a connection assembly installed on the distribution line; the monitoring assembly is connected with the connecting assembly, and the monitoring assembly is fixed on the distribution line through the connecting assembly; the monitoring assembly comprises a traveling wave acquisition device used for acquiring voltage traveling waves and current traveling waves on the distribution line; the data processing device is connected with the traveling wave acquisition device and is used for determining direction traveling waves on the distribution line according to the acquired current traveling waves and voltage traveling waves; the clock device is used for monitoring initial traveling wave time information of the directional traveling waves; and the data processing device is also used for calculating the distance from the fault position to the monitoring terminal according to the direction traveling wave and the initial traveling wave time information. According to the monitoring terminal for determining the fault position, provided by the invention, maintenance personnel can directly carry out fault positioning through the monitoring terminal without acquiring the fault position from a monitoring main station, so that the fault maintenance time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of power system fault detection and relay protection, and in particular to a monitoring terminal for determining a fault location. Background Art

[0002] The requirements for automation and intelligence of distribution networks are getting higher and higher. Fault location devices that locate and identify distribution network faults are widely used, especially overhead line fault location devices, which are widely used in weak links of the grid such as rural and mountainous areas. However, the fault location devices in related technologies need to be used in conjunction with the host computer. The fault location device detects the signal and then sends it to the monitoring main station for analysis and processing. In this way, all fault location devices need to send the detected signal to the monitoring main station for analysis, which not only increases the data processing volume of the monitoring main station, but also the on-site maintenance personnel can only obtain the fault location through the monitoring main station. Therefore, when there are many faults, it will affect the fault processing time. Summary of the invention

[0003] The present invention aims at at least solving the problem that the fault location cannot be quickly obtained to facilitate maintenance by staff.

[0004] Therefore, a first object of the present invention is to provide a monitoring terminal for determining a fault location.

[0005] The technical solution of the first aspect of the present invention provides a monitoring terminal for determining the fault location, the monitoring terminal is used for the distribution line, the monitoring terminal includes: a connecting component, installed on the distribution line; a monitoring component, connected to the connecting component, and the monitoring component is fixed on the distribution line through the connecting component; the monitoring component includes: a traveling wave acquisition device, used to collect voltage traveling waves and current traveling waves on the distribution line; a data processing device, connected to the traveling wave acquisition device, used to determine the directional traveling waves on the distribution line according to the collected current traveling waves and voltage traveling waves; a clock device, used to monitor the initial traveling wave time information of the directional traveling wave; the data processing device is also used to calculate the distance from the fault location to the monitoring terminal based on the directional traveling wave and the initial traveling wave time information.

[0006] The monitoring terminal for determining the fault location provided by the present invention can be used in a distribution line, thereby realizing fault monitoring of the distribution line, so that the staff can quickly locate the fault location for maintenance. Specifically, the monitoring terminal includes a connecting component and a monitoring component. The connecting component is installed on the distribution line, and the monitoring component is connected to the connecting component, and can be fixed on the distribution line through the connecting component, so as to realize monitoring of the distribution line through the monitoring component. The monitoring component includes a traveling wave acquisition device, a data processing device and a clock device. The traveling wave acquisition device can collect voltage traveling waves and current traveling waves on the distribution line, and the data processing device is connected to the traveling wave acquisition device, and can determine the directional traveling waves on the distribution line according to the collected current traveling waves and voltage traveling waves, so that the distance from the fault location to the monitoring terminal can be calculated according to the initial traveling wave time information of the directional traveling waves monitored by the clock device and the directional traveling waves. It can be understood that the monitoring terminal for determining the fault location provided in the present application can directly determine the distance between the fault location and the monitoring terminal, so that there is no need for the monitoring main station to centrally process the data, thereby reducing the burden of data processing. In addition, since the fault location can be directly determined through the monitoring terminal, maintenance personnel can directly locate the fault through the monitoring terminal without obtaining the fault location from the monitoring main station, thereby shortening the fault repair time.

[0007] In addition, the monitoring terminal for determining the fault location provided by the present application may also have the following additional technical features: In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: a positioning device for determining the location of the monitoring terminal; and a communication device for communicating with the client to send distance information from the fault location to the monitoring terminal to the client.

[0008] In this embodiment, the monitoring terminal for determining the fault location also includes a positioning device. The positioning device can determine the location of the monitoring terminal, so that maintenance personnel can quickly find the monitoring terminal to locate the fault. It is understandable that if the monitoring terminal is set in a relatively remote rural or mountainous area, maintenance personnel are unfamiliar with the local environment and therefore cannot quickly find the monitoring terminal to locate the fault. Therefore, by setting a positioning device on the monitoring terminal, the monitoring terminal can be quickly found to achieve fault location. The monitoring terminal can also include a communication device, which communicates with the client using the communication device to send the distance information from the fault location to the monitoring terminal to the client, so that the staff can understand the fault information and make targeted maintenance strategies.

[0009] The positioning device may be a GPS positioning device.

[0010] In some embodiments, optionally, the traveling wave acquisition device includes: a current transformer for detecting current traveling waves on the distribution line; and a voltage transformer for detecting voltage traveling waves on the distribution line.

[0011] In this embodiment, the traveling wave acquisition device includes a current transformer and a voltage transformer. The current transformer can detect the current traveling wave on the distribution line. The voltage transformer can detect the voltage traveling wave on the distribution line. Specifically, the current transformer can convert the primary current with a larger value into a secondary current with a smaller value through a certain transformation ratio for protection, measurement and other purposes. The voltage transformer can convert a high voltage signal into a low voltage signal for the convenience of measuring and protecting the equipment.

[0012] In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: a signal processing device connected to the traveling wave acquisition device, and used to process the detected voltage traveling waves and current traveling waves.

[0013] In this embodiment, the monitoring terminal for determining the fault location further comprises a signal processing device. The signal processing device is connected to the traveling wave acquisition device and can process the detected voltage traveling wave and current traveling wave, thereby improving the signal quality.

[0014] In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: a protection device for protecting the traveling wave collection device to prevent the traveling wave collection device from being affected by overload or short circuit.

[0015] In this embodiment, the monitoring terminal for determining the fault location further includes a protection device, which can protect the traveling wave acquisition device to prevent the traveling wave acquisition device from being affected by overload or short circuit, thereby increasing the service life of the monitoring terminal.

[0016] In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: an information display device for displaying parameter information of the monitoring terminal and distance information from the fault location to the monitoring terminal, wherein the parameter information includes the number of the monitoring terminal.

[0017] In this embodiment, the monitoring terminal for determining the fault location also includes an information display device. The information display device can display parameter information of the monitoring terminal and distance information from the fault location to the monitoring terminal, and the parameter information includes the number of the monitoring terminal. By setting the information display device to display the parameter information of the monitoring terminal and the distance information from the fault location to the monitoring terminal, maintenance personnel can quickly locate the monitoring device.

[0018] In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: a driving member connected to the connecting component, and used to drive the connecting component to move on the distribution line to drive the monitoring component to move on the distribution line.

[0019] In this embodiment, the monitoring terminal for determining the fault position also includes a driving member. The driving member is connected to the connecting component and can drive the connecting component to move on the distribution line to drive the monitoring component to move on the distribution line. It can be understood that by providing the driving member, the position of the monitoring component can be adjusted, so that the position of the monitoring terminal can be adjusted according to the actual situation of the distribution line to better monitor the distribution line.

[0020] In some embodiments, optionally, the connection assembly includes a guide wheel and a drive wheel, and the guide wheel and the drive wheel are used to clamp the distribution line and slide on the distribution line.

[0021] In this embodiment, the connecting assembly includes a guide wheel and a driving wheel, which are used to clamp the distribution line. The driving wheel then rotates in conjunction with the guide wheel to drive the entire monitoring terminal to slide on the distribution line. The installation position of the monitoring terminal on the distribution line can be easily adjusted, thereby improving the efficiency of maintenance operations.

[0022] In some embodiments, optionally, the driving member is also used to adjust the gap between the guide wheel and the driving wheel so that the monitoring terminal can adapt to different power distribution lines.

[0023] In this embodiment, the driving member can also adjust the gap between the guide wheel and the driving wheel so that the monitoring terminal can adapt to different power distribution lines. It can be understood that the thickness of the power distribution lines is different, so by adjusting the gap between the guide wheel and the driving wheel, the monitoring device can adapt to different power distribution lines, thereby improving the applicability of the monitoring device.

[0024] In some embodiments, optionally, the monitoring terminal for determining the fault location further includes: an alarm device for giving an alarm when a fault occurs in the power distribution line.

[0025] In this embodiment, the monitoring terminal for determining the fault location also includes an alarm device. The alarm device can alarm when a fault occurs in the power distribution line to remind maintenance personnel to perform maintenance.

[0026] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the structure of a monitoring terminal for determining a fault location according to an embodiment of the present invention; Figure 2 is one of the block diagrams of a monitoring terminal for determining a fault location according to an embodiment of the present invention; Figure 3 is a second block diagram of a monitoring terminal for determining a fault location according to an embodiment of the present invention; Figure 4 is a schematic diagram of traveling wave ranging according to an embodiment of the present invention; Figure 5 is a configuration diagram of a traveling wave ranging monitoring terminal according to an embodiment of the present invention; Figure 6 is one of the schematic diagrams of a power distribution line failure according to an embodiment of the present invention; Figure 7 is a second schematic diagram of a power distribution line failure according to an embodiment of the present invention; Figure 8 is a third schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig. 9 is a fourth schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig.10 is a fifth schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig.11 This is the sixth schematic diagram of a power distribution line failure according to an embodiment of the present invention.

[0028] in, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names is as follows: 10 monitoring terminal, 1 connecting component, 11 guide wheel, 12 driving wheel, 2 monitoring component, 21 traveling wave acquisition device, 211 current transformer, 212 voltage transformer, 22 data processing device, 23 clock device, 3 positioning device, 4 communication device, 5 signal processing device, 6 protection device, 7 information display device, 8 driving component, 9 alarm device, 20 distribution line. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0032] Refer to the following Figures 1 to 11 A monitoring terminal for determining a fault location according to some embodiments of the present invention is described.

[0033] In one embodiment according to the present application, Figure 1 , Figure 2 and Figure 3 As shown, a monitoring terminal 10 for determining a fault location is provided. The monitoring terminal 10 is used for a distribution line 20. The monitoring terminal 10 includes a connection component 1 and a monitoring component 2. The connection component 1 is installed on the distribution line 20. The monitoring component 2 is connected to the connection component 1, and the monitoring component 2 is fixed on the distribution line 20 through the connection component 1. The monitoring component 2 includes a traveling wave acquisition device 21, a data processing device 22 and a clock device 23. The traveling wave acquisition device 21 is used to collect voltage traveling waves and current traveling waves on the distribution line 20. The data processing device 22 is connected to the traveling wave acquisition device 21, and is used to determine the directional traveling waves on the distribution line 20 according to the collected current traveling waves and voltage traveling waves. The clock device 23 is used to monitor the initial traveling wave time information of the directional traveling wave; the data processing device 22 is also used to calculate the distance from the fault location to the monitoring terminal 10 according to the directional traveling wave and the initial traveling wave time information.

[0034] The monitoring terminal 10 for determining the fault position provided by the present invention can be used for the distribution line 20, so as to realize fault monitoring of the distribution line 20, so as to facilitate the staff to quickly locate the fault position for maintenance. Specifically, the monitoring terminal 10 includes a connection component 1 and a monitoring component 2. The connection component 1 is installed on the distribution line 20, and the monitoring component 2 is connected to the connection component 1, and can be fixed on the distribution line 20 through the connection component 1, so as to realize the monitoring of the distribution line 20 through the monitoring component 2. The monitoring component 2 includes a traveling wave acquisition device 21, a data processing device 22 and a clock device 23. The traveling wave acquisition device 21 can collect voltage traveling waves and current traveling waves on the distribution line 20, and the data processing device 22 is connected to the traveling wave acquisition device 21, and can determine the directional traveling waves on the distribution line 20 according to the collected current traveling waves and voltage traveling waves, so that the distance from the fault position to the monitoring terminal 10 can be calculated according to the initial traveling wave time information of the directional traveling waves monitored by the clock device 23 and the directional traveling waves. It can be understood that the monitoring terminal 10 for determining the fault location provided in the present application can directly determine the distance of the fault location from the monitoring terminal 10, so there is no need for the monitoring main station to centrally process the data, thereby reducing the burden of data processing. In addition, since the fault location can be directly determined through the monitoring terminal 10, maintenance personnel can directly locate the fault through the monitoring terminal 10 without obtaining the fault location from the monitoring main station, thereby shortening the fault repair time.

[0035] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: a positioning device 3 for determining the location of the monitoring terminal 10; and a communication device 4 for communicating with the client to send the distance information from the fault location to the monitoring terminal 10 to the client.

[0036] In this embodiment, the monitoring terminal 10 for determining the fault location also includes a positioning device 3. The positioning device 3 can determine the location of the monitoring terminal 10, so that maintenance personnel can quickly find the monitoring terminal 10 to locate the fault. It is understandable that if the monitoring terminal 10 is set in a relatively remote rural or mountainous area, maintenance personnel are unfamiliar with the local environment and therefore cannot quickly find the monitoring terminal 10 to locate the fault. Therefore, by setting the positioning device 3 on the monitoring terminal 10, the monitoring terminal 10 can be quickly found to achieve fault location. The monitoring terminal 10 can also include a communication device 4, which communicates with the client to send the distance information from the fault location to the monitoring terminal 10 to the client, so that the staff can understand the fault information and make targeted maintenance strategies.

[0037] The positioning device 3 may be a GPS (Global Positioning System) positioning device 3 .

[0038] In some embodiments, optionally, the communication device 4 can also communicate with other monitoring devices, so that all monitoring devices do not need to communicate with the monitoring master station, thereby reducing the amount of data processing.

[0039] In some embodiments, optionally, the traveling wave collection device 21 includes: a current transformer 211 for detecting current traveling waves on the distribution line 20 ; and a voltage transformer 212 for detecting voltage traveling waves on the distribution line 20 .

[0040] In this embodiment, the traveling wave acquisition device 21 includes a current transformer 211 and a voltage transformer 212. The current transformer 211 can detect the current traveling wave on the distribution line 20. The voltage transformer 212 can detect the voltage traveling wave on the distribution line 20. Specifically, the current transformer 211 can convert a primary current with a larger value into a secondary current with a smaller value through a certain transformation ratio for protection, measurement and other purposes. The voltage transformer 212 can convert a high voltage signal into a low voltage signal to facilitate measurement and protection of equipment.

[0041] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: a signal processing device 5 connected to the traveling wave acquisition device 21, and used to process the detected voltage traveling wave and current traveling wave.

[0042] In this embodiment, the monitoring terminal 10 for determining the fault location further includes a signal processing device 5. The signal processing device 5 is connected to the traveling wave acquisition device 21 and can process the detected voltage traveling wave and current traveling wave, thereby improving the signal quality.

[0043] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: a protection device 6 for protecting the traveling wave collection device 21 to prevent the traveling wave collection device 21 from being affected by overload or short circuit.

[0044] In this embodiment, the monitoring terminal 10 for determining the fault location further includes a protection device 6. The protection device 6 can protect the traveling wave collection device 21 to prevent the traveling wave collection device 21 from being affected by overload or short circuit, thereby increasing the service life of the monitoring terminal 10.

[0045] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: an information display device 7 for displaying parameter information of the monitoring terminal 10 and distance information from the fault location to the monitoring terminal 10 , wherein the parameter information includes the serial number of the monitoring terminal 10 .

[0046] In this embodiment, the monitoring terminal 10 for determining the fault position further includes an information display device 7. The information display device 7 can display parameter information of the monitoring terminal 10 and distance information from the fault position to the monitoring terminal 10, and the parameter information includes the serial number of the monitoring terminal 10. By setting the information display device 7 to display the parameter information of the monitoring terminal 10 and the distance information from the fault position to the monitoring terminal 10, maintenance personnel can quickly locate the monitoring device.

[0047] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: a driving component 8 connected to the connecting component 1 , for driving the connecting component 1 to move on the distribution line 20 , so as to drive the monitoring component 2 to move on the distribution line 20 .

[0048] In this embodiment, the monitoring terminal 10 for determining the fault position includes a driving member 8. The driving member 8 is connected to the connecting component 1, and can drive the connecting component 1 to move on the distribution line 20, so as to drive the monitoring component 2 to move on the distribution line 20. It can be understood that by providing the driving member 8, the position of the monitoring component 2 can be adjusted, so that the position of the monitoring terminal 10 can be adjusted according to the actual situation of the distribution line 20, so as to better monitor the distribution line 20.

[0049] In some embodiments, optionally, the connection assembly 1 includes a guide wheel 11 and a drive wheel 12 , and the guide wheel 11 and the drive wheel 12 are used to clamp the distribution line 20 and slide on the distribution line 20 .

[0050] In this embodiment, the connecting assembly 1 includes a guide wheel 11 and a driving wheel 12, and the distribution line 20 is clamped by the guide wheel 11 and the driving wheel 12, and then the driving wheel 12 rotates to cooperate with the guide wheel 11 to drive the entire monitoring terminal 10 to slide on the distribution line 20. The installation position of the monitoring terminal 10 on the distribution line 20 can be conveniently adjusted, thereby improving the efficiency of maintenance operations.

[0051] In some embodiments, optionally, the driving member 8 is also used to adjust the gap between the guide wheel 11 and the driving wheel 12 so that the monitoring terminal 10 can adapt to different power distribution lines 20 .

[0052] In this embodiment, the driving member 8 can also adjust the gap between the guide wheel 11 and the driving wheel 12 so that the monitoring terminal 10 can adapt to different distribution lines 20. It can be understood that the thickness of the distribution line 20 is different. Therefore, by adjusting the gap between the guide wheel 11 and the driving wheel 12, the monitoring device can adapt to different distribution lines 20, thereby improving the applicability of the monitoring device.

[0053] In some embodiments, optionally, the monitoring terminal 10 for determining the fault location further includes: an alarm device 9 for giving an alarm when a fault occurs in the distribution line 20 .

[0054] In this embodiment, the monitoring terminal 10 for determining the fault location further includes an alarm device 9. The alarm device 9 can alarm when a fault occurs in the power distribution line 20 to remind maintenance personnel to perform maintenance.

[0055] The monitoring terminals provided in the present application can be used together in combination to realize the monitoring of the fault location and the calculation of the distance. Specifically, when there are multiple monitoring terminals on the distribution line, each monitoring terminal is first numbered. The numbered terminals are grouped according to the network topology relationship. The terminal with the smallest number in the group is the main terminal, and the monitoring terminal that has a direct connection relationship with the main terminal is in the group. Then, the directional traveling wave is constructed by the current traveling wave and the voltage traveling wave collected by the traveling wave acquisition device. At the same time, the initial traveling wave time information of the directional traveling wave is monitored by the power system synchronous clock (clock device). When the directional traveling wave of the main terminal is a reverse traveling wave, data is requested from the members in the group (other monitoring terminals, i.e., slave terminals), and the direction of the directional traveling waves of other members is used to determine whether the fault is in the group. When the directional traveling waves of other members are all forward traveling waves, the fault is in the group, and then the data processing device is used to perform distance measurement calculations and the largest calculation result is uploaded to the distribution automation master station.

[0056] This specific implementation method realizes a new method of distribution network traveling wave ranging of an on-site intelligent distributed lightweight master station using directional traveling waves, solves the problem of difficulty in accessing a centralized ranging master station in the distribution network, shortens the fault finding time, and improves the power supply reliability of the distribution line.

[0057] Among them, Figure 4 As shown, when there are multiple monitoring terminals, the principle of the double-end traveling wave ranging of the present application is as follows: traveling wave ranging devices (monitoring terminals) are installed on both sides M and N of the fault line. After the fault occurs at point F, the traveling wave head generated at the fault point will propagate to both sides ( Figure 4 The arrows pointing to both sides of F indicate the propagation direction of the traveling wave). The times when the initial wave head arrives at the measuring ends on both sides are T1 and T2 respectively. According to the relationship between the line length and the fault distance, the following relationship holds: ; ; Among them, D MF It represents the distance between M and F, D NF It represents the distance between N and F, v represents the propagation speed of the traveling wave, and L represents the distance between M and N.

[0058] The following example illustrates this. Terminals are deployed at the head, middle, and end of the main line of a 10kV line, located at the main #001 pole, #072 pole, and #145 pole, respectively. The main #002 pole has a branch. Terminals are deployed at the head and end of the branch, located at the #022 pole and #041 pole of the branch.

[0059] The terminals are grouped according to the network topology. ①②④ is a group, ②③ is a group, and ④⑤ is a group. The terminals in the same group will communicate with each other. The terminal with the smallest number in the same group is the master terminal. When the initial traveling wave of the fault detected by the master terminal is negative (reverse traveling wave), it will request data from other members in the group. When and only when the traveling waves of other members are positive (forward traveling wave), the master terminal determines that the fault is within the group, performs ranging calculation, and sends the maximum result of the ranging results to the distribution master station.

[0060] The specific instructions are as follows: After a fault occurs, the initial fault wave propagates from the fault point to all locations along the line. The time when the initial fault wave reaches terminal i is Ti. Each terminal records the arrival time Ti and the direction of the wave. When the direction of the wave is a forward wave, it is recorded as positive (+). When the direction of the wave is a reverse wave, it is recorded as negative (-).

[0061] The following example illustrates a failure scenario: 1. If Figure 6 As shown in the figure, when the fault point f is located in the adjacent line, the directional traveling waves detected by terminals ①②③④⑤ are all positive, and it is judged that the fault is not in this line, and no ranging calculation is performed.

[0062] 2. The fault point f is located between the branch line poles #022 and #041.

[0063] like Figure 7 As shown in the figure, when the fault is located between the branch line #022 and #041, ① detects that the traveling wave direction is negative, and ① requests data from ②④. The traveling wave directions of ②④ are one positive and one negative, and ① determines that the fault is not in the group, and does not perform distance calculation.

[0064] ④ in ④⑤ detects that the traveling wave direction is negative, ④ requests data from ⑤, the traveling wave direction of ⑤ is positive, ④ determines that the fault is within the group and performs distance calculation.

[0065] According to T4, T5 and L45, the distance between the fault point and ④ is calculated as: Terminal ④ calculates the distance measurement result D 4f Upload to the distribution station.

[0066] 3. The fault point f is located between the main line poles #072 and #145.

[0067] like Figure 8 As shown in the figure, when the fault is located between the main line pole #072 and pole #145, ① detects that the traveling wave direction is negative, and ① requests data from ②④. The traveling wave directions of ②④ are one negative and one positive, and ① determines that the fault is not in the group, and does not perform distance calculation.

[0068] ② in ②③ detects that the traveling wave direction is negative, ② requests data from ③, the traveling wave direction of ③ is positive, ② determines that the fault is within the group and performs distance calculation.

[0069] According to T2, T3 and L23, the distance between the fault point and ② is calculated as: Terminal ② calculates the distance measurement result D 2f Upload to the distribution station.

[0070] 4. The fault point f is located between the main line poles #001 and #002.

[0071] like Fig. 9 As shown in the figure, when the fault is located between the main line pole #001 and pole #002, ① detects that the traveling wave direction is negative, recorded as T1-, and ① requests data (traveling wave arrival time and direction) from ②④. The traveling wave directions of ②④ are both positive, recorded as T2+ and T4+, and ① determines that the fault is within the group and performs distance calculation.

[0072] According to T1, T2 and L12, the distance between the fault point and ① is calculated as: .

[0073] According to T1, T4 and L14, the distance between the fault point and ① is calculated as: .

[0074] In theory, D 1f Should be equal to .

[0075] Terminal ① uploads the distance measurement calculation results to the distribution master station (distribution automation master station).

[0076] 5. The fault point f is located between the main line poles #002 and #072.

[0077] like Fig.10 As shown, when the fault is located between the main line pole #002 and pole #072, the same as the above situation, ① determine that the fault is within the group and perform distance calculation.

[0078] According to T1, T4 and L14, the distance from the fault point to ① is calculated as the distance from the #001 pole to the #002 pole on the main line on L14. Terminal ① uploads the maximum value of the ranging calculation result to the allocation master station.

[0079] 6. Fault point f is located before terminal ④ on the branch line.

[0080] like Fig.11 As shown in the figure, when the fault is located before terminal ④ on the branch line, ① determines that the fault is within the group and performs distance calculation. Based on T1, T2 and L12, the distance D between the fault point and ① is calculated. 1f It is the distance from pole #001 to pole #002 on the main line of L12. Terminal ① takes the maximum value of the distance calculation result Upload to the distribution station.

[0081] When numbering the terminals, the smaller number is in front and the larger number is in the back. The closer to the power source (substation), the smaller the number, and the closer to the load, the larger the number. First number the terminals on the trunk line, then number the terminals on the branch line. Based on this principle, the terminal numbering results are as follows: Figure 5 shown.

[0082] Directional traveling waves are constructed based on current traveling waves and voltage traveling waves. After a fault occurs, the initial traveling wave of the fault propagates to each terminal. Each terminal records the arrival time of the initial traveling wave of the fault and calculates the direction of the traveling wave. For the trunk line, it is stipulated that the bus points to the line as a forward traveling wave, and the line points to the bus as a reverse traveling wave. Under the above conditions, when the polarity of the initial voltage traveling wave is opposite to that of the initial current traveling wave, it is judged to be a reverse traveling wave. When the polarity of the initial current traveling wave and the initial voltage traveling wave are the same, it is a forward traveling wave. For branch lines, it is stipulated that the trunk line points to the branch line as a forward traveling wave, and the branch line points to the trunk line as a reverse traveling wave. Under the above conditions, when the polarity of the initial voltage traveling wave is opposite to that of the current traveling wave, it is judged to be a reverse traveling wave. When the polarity of the initial current traveling wave and the initial voltage traveling wave are the same, it is a forward traveling wave.

[0083] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device 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 device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0084] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0085] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A monitoring terminal for determining a fault location, characterized in that: The monitoring terminal is used for a power distribution line, and the monitoring terminal comprises: A connection assembly installed on the power distribution line; A monitoring component connected to the connecting component, wherein the monitoring component is fixed to the power distribution line through the connecting component; The monitoring components include: A traveling wave collection device, used for collecting voltage traveling waves and current traveling waves on the distribution line; A data processing device, connected to the traveling wave collection device, for determining the directional traveling wave on the distribution line according to the collected current traveling wave and voltage traveling wave; A clock device, used for monitoring the initial traveling wave time information of the directional traveling wave; The data processing device is also used to calculate the distance from the fault location to the monitoring terminal according to the directional traveling wave and the initial traveling wave time information.

2. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: A positioning device, used to determine the position of the monitoring terminal; The communication device is used to communicate with the client to send the distance information from the fault location to the monitoring terminal to the client.

3. The monitoring terminal for determining a fault location according to claim 1, characterized in that: The traveling wave acquisition device comprises: A current transformer, used to detect the current traveling wave on the distribution line; A voltage transformer is used to detect the voltage traveling wave on the distribution line.

4. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: A signal processing device is connected to the traveling wave acquisition device and is used to process the detected voltage traveling wave and current traveling wave.

5. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: The protection device is used to protect the traveling wave collection device to prevent the traveling wave collection device from being affected by overload or short circuit.

6. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: The information display device is used to display parameter information of the monitoring terminal and distance information from the fault location to the monitoring terminal, wherein the parameter information includes the serial number of the monitoring terminal.

7. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: A driving member is connected to the connecting component and is used to drive the connecting component to move on the distribution line, so as to drive the monitoring component to move on the distribution line.

8. The monitoring terminal for determining a fault location according to claim 7, characterized in that: The connecting assembly includes a guide wheel and a driving wheel, and the guide wheel and the driving wheel are used to clamp the distribution line and slide on the distribution line.

9. The monitoring terminal for determining a fault location according to claim 8, characterized in that: The driving member is also used to adjust the gap between the guide wheel and the driving wheel so that the monitoring terminal can adapt to different power distribution lines.

10. The monitoring terminal for determining a fault location according to claim 1, characterized in that: Also includes: An alarm device is used to give an alarm when a fault occurs in the power distribution line.

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