Power transmission line multi-parameter integrated monitoring device and method

Abstract

The invention discloses a power transmission line multi-parameter integrated monitoring device and method, and belongs to the field of power transmission lines. The device comprises an acquisition module and a control mainboard; the control mainboard comprises a control module; the acquisition module is used for acquiring operation parameters of a target power transmission line and environmental parameters of an environment where the line is located; the control module is used for preprocessing the operation parameters, judging whether power frequency current and traveling wave current in the preprocessed operation parameters meet preset triggering conditions or not, and if yes, judging that the target power transmission line is in a fault state; if not, the load state of the line is determined according to the maximum allowable current-carrying capacity and the wire current collected by the broadband current sensor; wherein the maximum allowable current-carrying capacity is determined by the preprocessed operation parameters and environment parameters. By implementing the application, the problem that the load state of the power transmission line cannot be accurately evaluated because the operation state of the power transmission line is determined only by depending on the operation data in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of power transmission lines, and in particular to a multi-parameter integrated monitoring device and method for power transmission lines. Background Art

[0002] Transmission lines are efficient and fast channels for energy transmission and are crucial for the safe operation of power grids. With the rapid decline in electricity demand and the integration of large amounts of renewable energy, timely detection of transmission line faults is crucial for ensuring safe and reliable power transmission.

[0003] Currently, most existing monitoring solutions focus on the collection and analysis of transmission line operating data. By obtaining transmission line operating data, they can determine whether the line has faults such as short circuits and open circuits. Although this type of method can achieve basic operating status diagnosis, it has gradually exposed problems in actual applications: traditional monitoring solutions only consider the abnormal operating state of line faults and cannot effectively identify the potential overload risks of transmission lines. This monitoring blind spot causes the line to be in an overloaded operating state for a long time, accelerating insulation aging, mechanical performance degradation and other problems, significantly shortening the line service life, and may even induce more serious faults. Summary of the Invention

[0004] The present invention provides a multi-parameter integrated monitoring device and method for a transmission line, which can solve the problem that the existing technology only relies on operating data to determine the operating status of the transmission line and cannot accurately evaluate the load status of the transmission line.

[0005] An embodiment of the present invention provides a multi-parameter integrated monitoring device for a power transmission line, comprising: an acquisition module and a control mainboard; the control mainboard comprises a control module;

[0006] The acquisition module is used to acquire operating parameters of the target transmission line and environmental parameters of the environment in which the target transmission line is located; wherein the operating parameters include conductor current;

[0007] The control module is configured to preprocess the operating parameters to obtain preprocessed operating parameters, and calculate the maximum allowable current carrying capacity based on the preprocessed operating parameters and the environmental parameters; wherein the preprocessed operating parameters include power frequency current and traveling wave current;

[0008] The control module is further configured to determine whether the power frequency current and the traveling wave current meet a preset trigger condition.

[0009] If so, it is determined that the target transmission line is in a fault state,

[0010] If not, determine whether the conductor current is less than the maximum allowable current carrying capacity. If so, determine that the line load state of the target transmission line is normal. If not, determine that the line load state of the target transmission line is overloaded.

[0011] Furthermore, the acquisition module includes a broadband current sensor; the broadband current sensor is embedded in the control mainboard; the broadband current sensor includes a Rogowski coil and a fixing nut; the Rogowski coil is fixed to the target transmission line through the fixing nut;

[0012] The Rogowski coil is used to collect the conductor current of the target transmission line.

[0013] Furthermore, the transmission line multi-parameter integrated monitoring device further includes: a cylindrical housing; the cylindrical housing is composed of an upper half shell and a lower half shell; the environmental parameter includes ambient temperature; the acquisition module further includes an ambient temperature sensor; the ambient temperature sensor is composed of a first thermal resistor temperature sensor and a protective shell enclosing the first thermal resistor temperature sensor; the ambient temperature sensor is mounted on the bottom of the lower half shell;

[0014] The first thermal resistor temperature sensor is used to monitor the ambient temperature of the environment in which the target power transmission line is located, and send the ambient temperature to the control module.

[0015] Furthermore, the environmental parameters also include light intensity data; the acquisition module also includes a light intensity sensor; the light intensity sensor is composed of a light guide column and a light processing board; the upper shell is composed of an upper surface, a light chamber, and a lower surface; the light guide column is arranged on the upper surface of the upper shell; the light processing board is arranged in the light chamber of the upper shell;

[0016] The light guide column is used to guide the light in the environment where the target transmission line is located to the light processing board, so that the light processing board converts the received light signal into corresponding light intensity data and then transmits the light intensity data to the control module.

[0017] Furthermore, the transmission line multi-parameter integrated monitoring device further includes: a power module; the control mainboard further includes a charge and discharge control circuit; the power module includes a solar panel, a current transformer, and a lithium battery; the solar panel is arranged on the upper surface of the upper half shell; the lithium battery is connected to the output end of the charge and discharge control circuit;

[0018] The charge and discharge control circuit is further configured to monitor the output voltage of the solar panel; when the output voltage is not less than a preset set voltage value, the solar panel is enabled to supply power to the lithium battery; when the output voltage is less than the preset set voltage value, the current transformer is enabled to supply power to the lithium battery;

[0019] The lithium battery is used to charge or discharge after receiving the instruction output by the charge and discharge control circuit.

[0020] Furthermore, the operating parameters also include real-time conductor temperature; the acquisition module also includes a conductor temperature sensor;

[0021] The wire temperature sensor is used to generate an analog signal representing the resistance value according to the constant current output by the power module, and transmit the analog signal to the control module;

[0022] The control module is further configured to determine the real-time conductor temperature of the target power transmission line according to a preset resistance-temperature mapping condition and the analog signal after receiving the analog signal.

[0023] Furthermore, the wire temperature sensor is composed of a second thermal resistance temperature sensor and a third thermal resistance temperature sensor;

[0024] The second thermal resistance temperature sensor is used to generate a first analog signal for representing a resistance value according to the constant current output by the power module, and transmit the first analog signal to the control module;

[0025] The control module is further configured to, after receiving the first analog signal, determine a first real-time conductor temperature of the target transmission line collected by the second thermal resistance temperature sensor based on a preset resistance-temperature mapping condition and the first analog signal;

[0026] The third thermal resistance temperature sensor is used to generate a second analog signal representing a change in resistance value according to the constant current output by the power module, and transmit the second analog signal to the control module;

[0027] The control module is further configured to, after receiving the second analog signal, determine a second real-time conductor temperature of the target transmission line collected by the second thermal resistance temperature sensor based on a preset resistance-temperature mapping condition and the second analog signal;

[0028] The control module is further configured to determine a first temperature interval within which the first real-time conductor temperature is located, and a second temperature interval within which the second real-time conductor temperature is located, and to obtain a corrected conductor temperature of the target transmission line based on the first real-time conductor temperature, the first temperature interval, the second real-time conductor temperature, and the second temperature interval; wherein the preprocessed operating parameters also include the corrected conductor temperature.

[0029] Furthermore, the calculating of the maximum allowable current carrying capacity according to the pre-processed operating parameters and the environmental parameters includes:

[0030] The maximum allowable current carrying capacity is calculated according to the corrected conductor temperature, the light intensity data, the ambient temperature, the power frequency current and the traveling wave current.

[0031] Furthermore, the transmission line multi-parameter integrated monitoring device further includes: a communication module;

[0032] The control module is further configured to generate a fault warning signal when determining that the target power transmission line is in a fault state, and transmit the fault warning signal to the communication module;

[0033] The communication module is configured to send fault warning information to a monitoring center upon receiving the fault warning signal;

[0034] The control module is further configured to generate an overload warning signal when determining that the line load state of the target power transmission line is an overload state, and transmit the overload warning signal to the communication module;

[0035] The communication module is further configured to send overload warning information to a monitoring center upon receiving the overload warning signal.

[0036] An embodiment of the present invention further provides a multi-parameter integrated monitoring method for a transmission line, which is applicable to a multi-parameter integrated monitoring device for a transmission line, comprising:

[0037] Acquiring operating parameters of a target transmission line and environmental parameters of an environment in which the target transmission line is located; wherein the operating parameters include conductor current;

[0038] Preprocessing the operating parameters to obtain preprocessed operating parameters, and calculating the maximum allowable current carrying capacity based on the preprocessed operating parameters and the environmental parameters; wherein the preprocessed operating parameters include power frequency current and traveling wave current;

[0039] Determine whether the power frequency current and the traveling wave current meet a preset trigger condition,

[0040] If so, it is determined that the target transmission line is in a fault state,

[0041] If not, determine whether the conductor current is less than the maximum allowable current carrying capacity. If so, determine that the line load state of the target transmission line is normal. If not, determine that the line load state of the target transmission line is overloaded.

[0042] The following beneficial effects are achieved by implementing the present invention:

[0043] The present invention provides a multi-parameter integrated monitoring device and method for a power transmission line. The device includes a collection module and a control mainboard; the control mainboard includes a control module; the collection module collects operating parameters of a target power transmission line and environmental parameters of the environment in which the target power transmission line is located;

[0044] Then, the operating parameters are preprocessed by the control module to obtain preprocessed operating parameters. After the conductor current in the operating parameters is preprocessed, the power frequency current and the traveling wave current can be extracted from the conductor current.

[0045] Finally, the control module determines whether the power frequency current and the traveling wave current meet a preset trigger condition. If so, it is determined that the target transmission line is in a fault state; if not, by comparing the magnitude relationship between the maximum allowable current carrying capacity and the conductor current, it is determined whether the line load state of the target transmission line is an overload state or a normal state;

[0046] Therefore, the device solves the problems of existing technologies that rely only on single operating data, ignore environmental impacts, and cannot accurately evaluate load status through collaborative collection of multiple parameters. It can not only monitor the fault status of the transmission line, but also monitor the line load status of the transmission line, thereby achieving the purpose of comprehensively monitoring the operating status of the transmission line and effectively improving the accuracy of fault diagnosis and overload assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] Figure 1 This is a flow chart of a multi-parameter integrated monitoring device for a power transmission line provided in one embodiment of the present application;

[0049] Figure 2 This is a first structural diagram of a multi-parameter integrated monitoring device for a power transmission line provided in one embodiment of the present application;

[0050] Figure 3 This is a second structural diagram of a multi-parameter integrated monitoring device for a power transmission line provided in one embodiment of the present application;

[0051] Figure 4 This is a third structural diagram of a multi-parameter integrated monitoring device for a power transmission line provided in one embodiment of the present application;

[0052] Figure 5 This is a schematic diagram of the front structure of a protective case provided by an embodiment of the present application;

[0053] Figure 6 This is a schematic diagram of the reverse structure of a protective case provided in one embodiment of the present application;

[0054] Figure 7 This is a diagram showing the connection between a first thermal resistance temperature sensor and a protective shell provided in one embodiment of the present application;

[0055] Figure 8 This is a structural diagram of a light guide column provided in one embodiment of the present application;

[0056] Figure 9 This is a hybrid power supply flow chart of a power module provided in one embodiment of the present application;

[0057] Figure 10 This is a schematic diagram of the data transmission flow between the acquisition module and the control module provided in one embodiment of the present application;

[0058] Figure 11 This is a structural diagram of a multi-parameter integrated monitoring method for a transmission line provided in one embodiment of the present application;

[0059] The accompanying drawings in the specification are numerals as follows:

[0060] Acquisition module 1, broadband current sensor 1-1, ambient temperature sensor 1-2, light intensity sensor 1-3, power module 1-4, wire temperature sensor 1-5, communication module 1-6, Rogowski coil 1-1-1, fixing nut 1-1-2, first thermal resistor temperature sensor 1-2-1, protective shell 1-2-2, fixing part 1-2-3, fixing screw 1-2-4, light guide column 1-3-1, light processing board 1-3-2, solar cell panel 1-4-1, current transformer 1-4-2, lithium battery 1-4-3, second thermal resistor temperature sensor 1-5-1, third thermal resistor temperature sensor 1-5-2, control main board 2, control module 2-1, charge and discharge control circuit 2-2, cylindrical shell 3, upper half shell 3-1, upper surface of upper half shell 3-1-1, light illumination compartment of upper half shell 3-1-2, lower surface of upper half shell 3-1-3, lower half shell 3-2. DETAILED DESCRIPTION

[0061] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0064] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0067] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0068] See also Figure 1 To solve the problem that the existing technology relies solely on operating data to determine the operating status of a transmission line and cannot accurately assess the load status of the transmission line, an embodiment of the present invention provides a multi-parameter integrated monitoring device for a transmission line, comprising: an acquisition module 1 and a control mainboard 2; the control mainboard 2 includes a control module 2-1;

[0069] The acquisition module 1 is used to acquire operating parameters of the target transmission line and environmental parameters of the environment in which the target transmission line is located; wherein the operating parameters include conductor current;

[0070] The control module 2-1 is configured to pre-process the operating parameters to obtain pre-processed operating parameters, and calculate the maximum allowable current carrying capacity based on the pre-processed operating parameters and the environmental parameters; wherein the pre-processed operating parameters include power frequency current and traveling wave current;

[0071] The control module 2-1 is further configured to determine whether the power frequency current and the traveling wave current meet a preset trigger condition.

[0072] If so, it is determined that the target transmission line is in a fault state,

[0073] If not, determining whether the conductor current is less than the maximum allowable current carrying capacity; if so, determining that the line load state of the target transmission line is a normal state; if not, determining that the line load state of the target transmission line is an overload state;

[0074] Schematically, the acquisition module 1 is used to acquire the operating parameters of the target transmission line and the environmental parameters of the environment in which the target transmission line is located;

[0075] Schematically, the operating parameters are preprocessed to obtain preprocessed operating parameters;

[0076] Specifically, after obtaining the conductor current, it is necessary to divide the conductor current into two paths. One path is subjected to signal processing such as low-pass filtering and denoising to extract the power frequency current; the other path is first subjected to denoising and 50Hz notch processing, and then high-pass filtering to extract the traveling wave current.

[0077] Specifically, the sampling rate of the traveling wave current is 1 MHz, and the frequency response range is 1 kHz to 1 MHz; the sampling rate of the power frequency current is 2 kHz, and the frequency response range is 0 Hz to 1 kHz;

[0078] Specifically, after extracting the power frequency current and the traveling wave current, the control module 2-1 determines whether the power frequency current and the traveling wave current meet a preset trigger condition, and then determines whether the target transmission line is in a fault state;

[0079] Specifically, the trigger conditions include power frequency current trigger conditions and traveling wave current trigger conditions:

[0080] (1) Power frequency current trigger condition: The absolute value of the power frequency current at the first target sampling point and the sampling point immediately preceding the first target sampling point both exceeds 200 A, and the increase is greater than 30%; wherein the first target sampling point is the sampling time point corresponding to the power frequency current data currently being judged for the power frequency current trigger condition;

[0081] (2) Traveling wave current trigger condition: The traveling wave current at the second target sampling point and the four sampling points before the first target sampling point all exceed 6 A; wherein, the second target sampling point is the sampling time point corresponding to the traveling wave current data currently being judged for the traveling wave current trigger condition.

[0082] Illustratively, if the power frequency current satisfies the power frequency current trigger condition, and the traveling wave current satisfies the traveling wave current trigger condition, it is determined that the target transmission line is in a fault state;

[0083] In addition, when it is determined that the target transmission line is in a fault state, it is necessary to upload the target waveform of the power frequency current and the target waveform of the traveling wave current, and locate the fault position of the target transmission line based on the target waveform of the traveling wave current;

[0084] Specifically, the acquisition range of the target waveform of the power frequency current is: taking the first target sampling point as the first trigger moment, acquiring the waveform 200 milliseconds before the first trigger moment and 400 milliseconds after the first trigger moment as the target waveform of the power frequency current;

[0085] Specifically, the acquisition range of the target waveform of the traveling wave current is: taking the second target sampling point as the second trigger moment, acquiring the waveform 20 microseconds before the second trigger moment and 80 microseconds after the second trigger moment as the target waveform of the traveling wave current;

[0086] It should be noted that the fault position of the target transmission line can be located based on the target waveform of the traveling wave current through existing fault location methods such as double-end fault location. Since the fault location method has formed a mature theoretical system and engineering practice experience in the field of power system fault diagnosis, it will not be repeated in this embodiment.

[0087] Schematically, if the power frequency current and the traveling wave current do not simultaneously satisfy corresponding trigger conditions, it is determined that the target transmission line is not in a fault state;

[0088] Specifically, when it is determined that the target transmission line is not in a fault state, the line load state of the target transmission line is determined according to the current maximum allowable current carrying capacity and the conductor current:

[0089] (1) when the conductor current is not less than the maximum allowable current carrying capacity, determining that the line load state of the target transmission line is an overload state;

[0090] (2) when the conductor current is less than the maximum allowable current carrying capacity, determining that the line load state of the target transmission line is a normal state;

[0091] It should be noted that the maximum allowable current-carrying capacity is determined based on the pre-processed operating parameters and the environmental parameters. In this embodiment, the calculation of the maximum allowable current-carrying capacity refers to the domestic standard GB 50545-2010 "110kV~750kV Overhead Transmission Line Design Specifications", which will not be repeated here in this embodiment.

[0092] See also Figure 2 In a preferred embodiment, the acquisition module 1 includes a broadband current sensor 1-1; the broadband current sensor 1-1 is embedded in the control mainboard 2; the broadband current sensor 1-1 includes a Rogowski coil 1-1-1 and a fixing nut 1-1-2; the Rogowski coil 1-1-1 is fixed to the target transmission line through the fixing nut 1-1-2;

[0093] The Rogowski coil 1-1-1 is used to collect the conductor current of the target transmission line;

[0094] Specifically, in this embodiment, the Rogowski coil 1-1-1 is installed around the target transmission line and collects the conductor current based on the principle of electromagnetic induction. There is no need to modify the transmission line (such as stripping or disconnecting), thereby effectively avoiding damage to the line insulation layer.

[0095] See also Figure 3 In a preferred embodiment, the transmission line multi-parameter integrated monitoring device further includes: a cylindrical housing 3; the cylindrical housing 3 is composed of an upper half housing 3-1 and a lower half housing 3-2; the environmental parameter includes ambient temperature; the acquisition module 1 also includes an ambient temperature sensor 1-2; the ambient temperature sensor 1-2 is composed of a first thermal resistor temperature sensor 1-2-1 and a protective shell 1-2-2 that wraps the first thermal resistor temperature sensor 1-2-1; the ambient temperature sensor 1-2 is installed at the bottom of the lower half housing 3-2;

[0096] The first thermal resistance temperature sensor 1-2-1 is used to monitor the ambient temperature of the environment in which the target power transmission line is located and send the ambient temperature to the control module 2-1;

[0097] Specifically, in this embodiment, in order to facilitate the installation of the transmission line, the transmission line multi-parameter integrated monitoring device is set to a cylindrical shape, and the cylindrical shell 3 of the transmission line multi-parameter integrated monitoring device is divided into an upper half shell 3-1 and a lower half shell 3-2. Figure 3 and Figure 4 , Figure 3 It is a multi-parameter integrated monitoring device for transmission lines in the open state. Figure 4 A multi-parameter integrated monitoring device for a power transmission line in a closed state, whereby the multi-parameter integrated monitoring device for a power transmission line can be stably installed on the target power transmission line;

[0098] Specifically, see Figure 2 , the first thermal resistance temperature sensor 1-2-1 is in the form of a wire, see Figure 5 and Figure 6 , Figure 5 This is a front view of the protective shell 1-2-2 that wraps the first thermal resistance temperature sensor 1-2-1. Figure 6 This is a schematic diagram of the reverse side of the protective shell 1-2-2 that wraps the first thermal resistance temperature sensor 1-2-1. The protective shell 1-2-2 is a circular shell. Figure 7, is a diagram showing the connection relationship between the first thermal resistor temperature sensor 1-2-1 and the protective shell 1-2-2. The first thermal resistor temperature sensor 1-2-1 is inserted into the protective shell 1-2-2 through the hole in the center of the front face of the protective shell 1-2-2, so that the first thermal resistor temperature sensor 1-2-1 is fixed inside the protective shell 1-2-2, and the protective shell 1-2-2 is fixed to the bottom of the transmission line multi-parameter integrated monitoring device through the fixing member 1-2-3 and the fixing screw 1-2-4;

[0099] It should be noted that the material of the protective shell 1-2-2 is white polybutylene terephthalate material, which can avoid the influence of direct solar radiation on the accuracy of temperature measurement, can reflect the direct radiation energy of sunlight, and has the characteristics of wear resistance, heat resistance and cold resistance.

[0100] Specifically, the ambient temperature sensor 1 - 2 collects the ambient temperature of the environment where the target power transmission line is located every 5 minutes, and sends the ambient temperature to the control module 2 - 1 .

[0101] In a preferred embodiment, the environmental parameters also include light intensity data; the acquisition module 1 also includes a light intensity sensor 1-3; the light intensity sensor 1-3 is composed of a light guide column 1-3-1 and a light processing board 1-3-2; the upper shell 3-1 is composed of an upper surface 3-1-1, a light chamber 3-1-2 and a lower surface 3-1-3; the light guide column 1-3-1 is arranged on the upper surface 3-1-1 of the upper shell 3-1; the light processing board 1-3-2 is arranged in the light chamber 3-1-2 of the upper shell 3-1;

[0102] The light guide column 1-3-1 is used to guide the light in the environment where the target transmission line is located to the light processing board 1-3-2, so that the light processing board 1-3-2 converts the received light signal into corresponding light intensity data and transmits the light intensity data to the control module 2-1;

[0103] Specifically, see Figure 4 The light guide column 1-3-1 is arranged on the upper half shell 3-1 and is located in the middle of the upper shell, and is located directly above the multi-parameter integrated monitoring device for the power transmission line. Figure 8 It is a structural schematic diagram of the light guide column 1-3-1.

[0104] Specifically, the illumination processing board 1-3-2 (not shown in the figure) is located in the illumination chamber 3-1-2 in the middle of the upper shell 3-1, and the light guide column 1-3-1 guides the light of the environment in which the target transmission line is located to the photosensitive element of the illumination processing board 1-3-2, so that the photosensitive element of the illumination processing board 1-3-2 converts the received light signal into an electrical signal every five minutes, and undergoes pre-processing such as amplification and filtering to remove noise, and converts the pre-processed electrical signal into light intensity data (light intensity value) through analog-to-digital conversion (ADC), and transmits the light intensity data to the control module 2-1 through the illumination processing board connecting line.

[0105] In a preferred embodiment, the transmission line multi-parameter integrated monitoring device further includes: a power module 1-4; the control mainboard 2 also includes a charge and discharge control circuit 2-2; the power module 1-4 includes a solar panel 1-4-1, a current transformer 1-4-2 and a lithium battery 1-4-3; the solar panel 1-4-1 is arranged on the upper surface 3-1-1 of the upper half shell 3-1; the lithium battery 1-4-3 is connected to the output end of the charge and discharge control circuit 2-2;

[0106] The charge and discharge control circuit 2-2 is further configured to monitor the output voltage of the solar panel 1-4-1; when the output voltage is not less than a preset set voltage value, the solar panel 1-4-1 is enabled to supply power to the lithium battery 1-4-3; when the output voltage is less than the preset set voltage value, the current transformer 1-4-2 is enabled to supply power to the lithium battery 1-4-3;

[0107] The lithium battery 1-4-3 is used to charge or discharge after receiving the instruction output by the charge and discharge control circuit 2-2;

[0108] Schematically, in this embodiment, a hybrid power supply mode is adopted in which the current transformer 1-4-2 is used as the inductive power source and the solar power is used as the main power source, and the lithium battery 1-4-3 is used as the power source;

[0109] Specifically, see Figure 3 The charge and discharge control circuit 2-2 is provided on the control main board 2, and the current transformer 1-4-2 obtains current from the target transmission line through electromagnetic induction and converts it into electrical energy; see Figure 4 The solar cell panel 1-4-1 is arranged on the upper surface 3-1-1 of the upper half shell 3-1, and is used to collect solar energy in the environment, thereby converting light energy into electrical energy;

[0110] The charge and discharge control circuit 2-2 monitors the output voltage of the solar cell panel 1-4-1; when the output voltage is not less than a preset set voltage value, the solar cell panel 1-4-1 is enabled to supply power to the lithium battery 1-4-3, and the inductive power-taking channel of the current transformer 1-4-2 is closed; when the output voltage is less than the preset set voltage value, the current transformer 1-4-2 is enabled to supply power to the lithium battery 1-4-3, and the solar power supply channel of the solar cell panel 1-4-1 is closed;

[0111] See also Figure 9 , is a hybrid power supply flow chart of this embodiment. When the lithium battery 1-4-3 receives the discharge instruction output by the charge and discharge control circuit 2-2, it supplies power to the acquisition module 1 and the control module 2-1 through the power connection line to ensure that the sensor in the acquisition module 1 and the control module 2-1 can obtain a stable power supply to operate normally.

[0112] In a preferred embodiment, the operating parameters further include real-time conductor temperature; the acquisition module 1 further includes conductor temperature sensors 1-5;

[0113] The wire temperature sensor 1-5 is used to generate an analog signal representing the resistance value according to the constant current output by the power module 1-4, and transmit the analog signal to the control module 2-1;

[0114] The control module 2-1 is further configured to determine the real-time conductor temperature of the target transmission line according to a preset resistance-temperature mapping condition and the analog signal after receiving the analog signal;

[0115] Specifically, the target transmission line will produce temperature changes during operation, which will cause the resistance of the conductor temperature sensor 1-5 to change accordingly. Therefore, the conductor temperature sensor 1-5 generates an analog signal for representing the resistance value based on the characteristic that its own resistance changes with temperature, and transmits the analog signal to the control module 2-1, so that after receiving the analog signal, the control module 2-1 determines the real-time conductor temperature of the target transmission line based on the preset resistance-temperature mapping condition and the analog signal;

[0116] Specifically, the resistance-temperature mapping condition is:

[0117] When the conductor temperature t≥0℃: R t =R0×(1+at+bt 2 );

[0118] When the conductor temperature t<0℃: R t=R0×(1+at+bt 2 +c(t-100)t 3 );

[0119] Where R0 is the standard resistance value at 0°C; a = 3.9083 × 10 -3 , b=-5.775×10 -7 , c = -4.183 × 10 -12 , R t is the real-time resistance value of the wire temperature sensor 1-5, which can be determined by analyzing the analog signal.

[0120] In a preferred embodiment, the wire temperature sensor 1-5 is composed of a second thermal resistance temperature sensor 1-5-1 and a third thermal resistance temperature sensor 1-5-2;

[0121] The second thermal resistance temperature sensor 1-5-1 is used to generate a first analog signal for representing the resistance value according to the constant current output by the power module 1-4, and transmit the first analog signal to the control module 2-1;

[0122] The control module 2-1 is further configured to, after receiving the first analog signal, determine the first real-time conductor temperature of the target transmission line collected by the second thermal resistance temperature sensor 1-5-1 based on a preset resistance-temperature mapping condition and the first analog signal;

[0123] The third thermal resistance temperature sensor 1-5-2 is used to generate a second analog signal representing a change in resistance value according to the constant current output by the power module 1-4, and transmit the second analog signal to the control module 2-1;

[0124] The control module 2-1 is further configured to determine, after receiving the second analog signal, the second real-time conductor temperature of the target transmission line collected by the third thermal resistance temperature sensor 1-5-2 based on a preset resistance-temperature mapping condition and the second analog signal;

[0125] The control module 2-1 is further configured to determine a first temperature interval within which the first real-time conductor temperature is located, and a second temperature interval within which the second real-time conductor temperature is located, and obtain a corrected conductor temperature of the target transmission line based on the first real-time conductor temperature, the first temperature interval, the second real-time conductor temperature, and the second temperature interval; wherein the pre-processed operating parameters also include the corrected conductor temperature;

[0126] Specifically, see Figure 2The conductor temperature sensor 1-5 is composed of a second thermal resistance temperature sensor 1-5-1 and a third thermal resistance temperature sensor 1-5-2. The second thermal resistance temperature sensor 1-5-1 and the third thermal resistance temperature sensor 1-5-2 are both platinum resistance temperature sensors, whose resistivity increases with increasing temperature. The second thermal resistance temperature sensor 1-5-1 and the third thermal resistance temperature sensor 1-5-2 are intertwined on the target transmission line.

[0127] Specifically, the second thermal resistor temperature sensor 1-5-1 generates a first analog signal for representing the resistance value, and transmits the first analog signal to the control module 2-1, so that the control module 2-1 analyzes the first analog signal to obtain the current real-time resistance value R of the second thermal resistor temperature sensor 1-5-1. t1 , and substitute it into the resistance-temperature mapping condition to calculate the first real-time conductor temperature t1 of the target transmission line;

[0128] Similarly, the third thermal resistor temperature sensor 1-5-2 generates a second analog signal for representing the resistance value, and transmits the second analog signal to the control module 2-1, so that the control module 2-1 analyzes the second analog signal and obtains the current real-time resistance value R of the third thermal resistor temperature sensor 1-5-2. t2 , and substitute it into the resistance-temperature mapping condition to calculate the second real-time conductor temperature t2 of the target transmission line;

[0129] Specifically, after obtaining the first real-time conductor temperature t1 and the second real-time conductor temperature t2, it is necessary to calculate the absolute value of the difference between the first real-time conductor temperature and the second real-time conductor temperature, and determine whether the absolute value of the difference is greater than a preset temperature difference threshold.

[0130] If Δt=|t1-t2|≤0.5℃, the corrected wire temperature t Correction =(t1+t2) / 2;

[0131] If Δt = |t1-t2| > 0.5°C, the control module 2-1 takes the current time as the starting point and extracts a temperature array consisting of the historical corrected conductor temperatures determined every five minutes within 30 minutes before the starting point: {t1', t2', t3', t4', t5', t6'};

[0132] If [t1-(t1'+t2'+t3'+t4'+t5'+t6') / 6]<[t2-(t1'+t2'+t3'+t4'+t5'+t6') / 6],

[0133] Then t Correction=t1, otherwise t Correction =t2;

[0134] It should be noted that if the current transmission line multi-parameter integrated monitoring device has not been running for less than 30 minutes, that is, the temperature array has less than 6 sets of historical corrected conductor temperatures, then only the currently recorded historical corrected conductor temperatures are used to form the temperature array for judgment, such as:

[0135] In the 20th minute, if the control module 2-1 determines that Δt=|t1-t2|>0.5°C, only the three sets of historical corrected wire temperatures in the previous 15 minutes are used for calculation. The temperature array at this time is {t1', t2', t3'};

[0136] If [t1-(t1'+t2'+t3') / 3]<[t2-(t1'+t2'+t3') / 3], then t Correction =t1, otherwise t Correction =t2.

[0137] In a preferred embodiment, the calculating the maximum allowable current carrying capacity according to the pre-processed operating parameters and the environmental parameters includes:

[0138] Calculating a maximum allowable current carrying capacity based on the corrected conductor temperature, the light intensity data, the ambient temperature, the power frequency current, and the traveling wave current;

[0139] Specifically, this embodiment integrates the broadband current sensor 1-1, the ambient temperature sensor 1-2, the light intensity sensor 1-3 and the wire temperature sensor 1-5 into the acquisition module 1, thereby comprehensively considering the multi-source data collected by multiple types of sensors, and determines the maximum allowable current carrying capacity through the control module 2-1, thereby effectively improving the monitoring efficiency of the transmission line.

[0140] In a preferred embodiment, the transmission line multi-parameter integrated monitoring device further includes: communication modules 1-6;

[0141] The control module 2-1 is further configured to generate a fault warning signal when determining that the target power transmission line is in a fault state, and transmit the fault warning signal to the communication module 1-6;

[0142] The communication module 1-6 is used to send fault warning information to the monitoring center when receiving the fault warning signal;

[0143] The control module 2-1 is further configured to generate an overload warning signal when determining that the line load state of the target transmission line is an overload state, and transmit the overload warning signal to the communication module 1-6;

[0144] The communication module 1-6 is further configured to send an overload warning message to a monitoring center upon receiving the overload warning signal;

[0145] See also Figure 3 Specifically, in this embodiment, in order to enable the staff to know the operating status of the target transmission line in a timely manner, a communication module 1-6 is also provided in the transmission line multi-parameter integrated monitoring device, thereby enabling the staff to receive fault warning information or overload warning information in a timely manner at the monitoring center;

[0146] See also Figure 10 , is a schematic diagram of the data transmission flow between the sensors in the acquisition module 1 and the modules in the acquisition module 1 and the control main board 2 in this embodiment. Therefore, this embodiment effectively improves the monitoring efficiency of the transmission line by transmitting multi-source data collected by multiple types of sensors to the control module 2-1 in the control main board 2, continuously supplying power through the power supply module 1-4, and transmitting warning information to the monitoring center through the communication module 1-6.

[0147] See Figure 11 , is a transmission line multi-parameter integrated monitoring method provided by an embodiment of the present invention, applicable to a transmission line multi-parameter integrated monitoring device, comprising:

[0148] S1. Acquire operating parameters of a target transmission line and environmental parameters of an environment in which the target transmission line is located; wherein the operating parameters include conductor current;

[0149] S2. Preprocessing the operating parameters to obtain preprocessed operating parameters, and calculating the maximum allowable current carrying capacity based on the preprocessed operating parameters and the environmental parameters; wherein the preprocessed operating parameters include power frequency current and traveling wave current;

[0150] S3, judging whether the power frequency current and the traveling wave current meet the preset triggering conditions,

[0151] If so, it is determined that the target transmission line is in a fault state,

[0152] If not, determine whether the conductor current is less than the maximum allowable current carrying capacity. If so, determine that the line load state of the target transmission line is normal. If not, determine that the line load state of the target transmission line is overloaded.

[0153] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-parameter integrated monitoring device for a transmission line, characterized in that: include: Acquisition module and control mainboard; the control mainboard includes a control module; The acquisition module is used to acquire operating parameters of the target transmission line and environmental parameters of the environment in which the target transmission line is located; wherein the operating parameters include conductor current; The control module is configured to preprocess the operating parameters to obtain preprocessed operating parameters, and calculate the maximum allowable current carrying capacity based on the preprocessed operating parameters and the environmental parameters; wherein the preprocessed operating parameters include power frequency current and traveling wave current; The control module is further configured to determine whether the power frequency current and the traveling wave current meet a preset trigger condition. If so, it is determined that the target transmission line is in a fault state, If not, determine whether the conductor current is less than the maximum allowable current carrying capacity. If so, determine that the line load state of the target transmission line is normal. If not, determine that the line load state of the target transmission line is overloaded.

2. The multi-parameter integrated monitoring device for transmission lines according to claim 1, characterized in that: The acquisition module includes a broadband current sensor; the broadband current sensor is embedded in the control mainboard; the broadband current sensor includes a Rogowski coil and a fixing nut; the Rogowski coil is fixed to the target transmission line through the fixing nut; The Rogowski coil is used to collect the conductor current of the target transmission line.

3. The multi-parameter integrated monitoring device for power transmission lines according to claim 1, characterized in that: Also includes: A cylindrical housing; the cylindrical housing is composed of an upper half shell and a lower half shell; the environmental parameter includes the ambient temperature; the acquisition module further includes an ambient temperature sensor; the ambient temperature sensor is composed of a first thermal resistor temperature sensor and a protective shell enclosing the first thermal resistor temperature sensor; the ambient temperature sensor is mounted on the bottom of the lower half shell; The first thermal resistor temperature sensor is used to monitor the ambient temperature of the environment in which the target power transmission line is located, and send the ambient temperature to the control module.

4. The multi-parameter integrated monitoring device for power transmission lines according to claim 3, characterized in that: The environmental parameters also include light intensity data; the acquisition module also includes a light intensity sensor; the light intensity sensor is composed of a light guide column and a light processing board; the upper half shell is composed of an upper surface, a light chamber and a lower surface; the light guide column is provided on the upper surface of the upper half shell; The light processing board is arranged in the light chamber of the upper half shell; The light guide column is used to guide the light in the environment where the target transmission line is located to the light processing board, so that the light processing board converts the received light signal into corresponding light intensity data and then transmits the light intensity data to the control module.

5. The multi-parameter integrated monitoring device for power transmission lines according to claim 4, characterized in that: Also includes: Power supply module; the control mainboard further includes a charge and discharge control circuit; the power supply module includes a solar panel, a current transformer and a lithium battery; the solar panel is arranged on the upper surface of the upper half shell; the lithium battery is connected to the output end of the charge and discharge control circuit; The charge and discharge control circuit is further configured to monitor the output voltage of the solar panel; when the output voltage is not less than a preset set voltage value, the solar panel is enabled to supply power to the lithium battery; when the output voltage is less than the preset set voltage value, the current transformer is enabled to supply power to the lithium battery; The lithium battery is used to charge or discharge after receiving the instruction output by the charge and discharge control circuit.

6. The multi-parameter integrated monitoring device for power transmission lines according to claim 5, characterized in that: The operating parameters also include real-time conductor temperature; the acquisition module also includes a conductor temperature sensor; The wire temperature sensor is used to generate an analog signal representing the resistance value according to the constant current output by the power module, and transmit the analog signal to the control module; The control module is further configured to determine the real-time conductor temperature of the target power transmission line according to a preset resistance-temperature mapping condition and the analog signal after receiving the analog signal.

7. The multi-parameter integrated monitoring device for transmission lines according to claim 6, characterized in that: The wire temperature sensor is composed of a second thermal resistance temperature sensor and a third thermal resistance temperature sensor; The second thermal resistance temperature sensor is used to generate a first analog signal for representing a resistance value according to the constant current output by the power module, and transmit the first analog signal to the control module; The control module is further configured to, after receiving the first analog signal, determine a first real-time conductor temperature of the target transmission line collected by the second thermal resistance temperature sensor based on a preset resistance-temperature mapping condition and the first analog signal; The third thermal resistance temperature sensor is used to generate a second analog signal representing a change in resistance value according to the constant current output by the power module, and transmit the second analog signal to the control module; The control module is further configured to, after receiving the second analog signal, determine a second real-time conductor temperature of the target transmission line collected by the second thermal resistance temperature sensor based on a preset resistance-temperature mapping condition and the second analog signal; The control module is further configured to determine a first temperature interval within which the first real-time conductor temperature is located, and a second temperature interval within which the second real-time conductor temperature is located, and to obtain a corrected conductor temperature of the target transmission line based on the first real-time conductor temperature, the first temperature interval, the second real-time conductor temperature, and the second temperature interval; wherein the preprocessed operating parameters also include the corrected conductor temperature.

8. The multi-parameter integrated monitoring device for power transmission lines according to claim 7, characterized in that: The calculating the maximum allowable current carrying capacity according to the pre-processed operating parameters and the environmental parameters includes: The maximum allowable current carrying capacity is calculated according to the corrected conductor temperature, the light intensity data, the ambient temperature, the power frequency current and the traveling wave current.

9. The multi-parameter integrated monitoring device for power transmission lines according to claim 8, characterized in that: Also includes: Communication module; The control module is further configured to generate a fault warning signal when determining that the target power transmission line is in a fault state, and transmit the fault warning signal to the communication module; The communication module is configured to send fault warning information to a monitoring center upon receiving the fault warning signal; The control module is further configured to generate an overload warning signal when determining that the line load state of the target power transmission line is an overload state, and transmit the overload warning signal to the communication module; The communication module is further configured to send overload warning information to a monitoring center upon receiving the overload warning signal.

10. A multi-parameter integrated monitoring method for a transmission line, applicable to a multi-parameter integrated monitoring device for a transmission line, characterized in that: include: Acquiring operating parameters of a target transmission line and environmental parameters of an environment in which the target transmission line is located; wherein the operating parameters include conductor current; Preprocessing the operating parameters to obtain preprocessed operating parameters, and calculating the maximum allowable current carrying capacity based on the preprocessed operating parameters and the environmental parameters; wherein the preprocessed operating parameters include power frequency current and traveling wave current; Determine whether the power frequency current and the traveling wave current meet a preset trigger condition, If so, it is determined that the target transmission line is in a fault state, If not, determine whether the conductor current is less than the maximum allowable current carrying capacity. If so, determine that the line load state of the target transmission line is normal. If not, determine that the line load state of the target transmission line is overloaded.

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