Lightning stroke current value determination method and system, storage medium and electronic device

Abstract

The embodiment of the invention provides a lightning stroke current value determination method and system, a storage medium and an electronic device. The method comprises the steps that a first detection optical signal is generated through a first optical signal transmitting end, the first detection optical signal is transmitted to an optical fiber composite overhead ground wire (OPGW), the first detection optical signal is a modulated optical signal, and the first detection optical signal has two polarization components which are perpendicular to each other; a target optical signal is obtained from the OPGW through a first optical signal receiving end, the target optical signal is a first detection optical signal or a scattering signal transmitted by the OPGW, and the scattering signal is a signal reflected by the first detection optical signal in the OPGW transmission process; demodulating the target optical signal through a first optical signal receiving end, and determining the polarization state rotation RSOP speed of the first detection optical signal in the OPGW transmission process; and a lightning stroke current value is determined according to the RSOP speed, and the lightning stroke current value is the current value of lightning stroke current generated on the OPGW peripheral cable under the condition that the lightning stroke event occurs.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and in particular, to a method and system for determining a lightning current value, a storage medium, and an electronic device. Background Art

[0002] Lightning is a natural phenomenon with great destructive power. When lightning strikes, it can generate an impulse voltage of tens of thousands or even hundreds of thousands of volts, which is enough to burn electrical equipment such as generators, transformers, circuit breakers, etc. in the power system or break through the insulation of power transmission lines, causing a short circuit, leading to fire and explosion of flammable, inflammable and explosive items.

[0003] At present, when optical signals are transmitted in the Optical Fiber Composite Overhead Ground Wire (OPGW), the polarization state change of the optical signal can be detected by a polarizer and an analyzer to determine the lightning current value (lightning strikes will generate lightning current on the OPGW peripheral cable), or the lightning strike position can be determined by the change of the polarization mode dispersion (PMD) of the optical signal. However, the above methods cannot accurately determine the lightning current value, making it difficult for operation and maintenance personnel to accurately judge the degree of lightning damage and determine whether to repair quickly.

[0004] With regard to the problem in the related art that the current value of the lightning current generated by a lightning strike on the peripheral cable of the OPGW cannot be accurately determined, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method and system for determining a lightning current value, a storage medium and an electronic device, so as to at least solve the problem in the related art that the current value of the lightning current generated by a lightning strike on an OPGW peripheral cable cannot be accurately determined.

[0006] According to one embodiment of the present invention, a method for determining a lightning current value is provided, comprising: generating a first detection optical signal through a first optical signal transmitting end, and transmitting the first detection optical signal to an optical fiber composite overhead ground wire (OPGW), wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; acquiring a target optical signal from the OPGW through a first optical signal receiving end, wherein the target optical signal is the first detection optical signal or a scattered signal after being transmitted through the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW; demodulating the target optical signal through the first optical signal receiving end, and determining a polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; determining a lightning current value according to the RSOP speed, wherein the lightning current value is a current value of a lightning current generated on a peripheral cable of the OPGW in the event of a lightning strike.

[0007] In an exemplary embodiment, a first detection light signal is generated by a first optical signal transmitting end, including: using a narrowband laser to transmit detection light, and dividing the detection light into a first polarization light in a first polarization direction and a second polarization light in a second polarization direction through a first polarization beam splitter, wherein the first polarization direction is perpendicular to the second polarization direction; combining the first polarization light and the second polarization light through a first optical fiber coupler to obtain a combined light source; and modulating the combined light source with an adjustment signal through an optical modulator to obtain the first detection light signal, wherein the narrowband laser, the first polarization beam splitter, the first optical fiber coupler, and the optical modulator are located in the first optical signal transmitting end.

[0008] In an exemplary embodiment, it is characterized in that the first detection optical signal is transmitted to the optical fiber composite overhead ground wire OPGW, including: transmitting the first detection optical signal to the OPGW through a circulator; obtaining the target optical signal from the OPGW through the first optical signal receiving end, including: obtaining the scattered signal from the circulator through the first optical signal receiving end, wherein the first optical signal receiving end and the first optical signal transmitting end are located at the same end of the OPGW.

[0009] In an exemplary embodiment, transmitting the first detection optical signal to the optical fiber composite overhead ground wire OPGW includes: transmitting the first detection optical signal to the OPGW through a first combiner / splitter; obtaining a target optical signal from the OPGW through a first optical signal receiving end, including: obtaining the first detection optical signal after transmission through the OPGW from a second combiner / splitter through the first optical signal receiving end, wherein the first combiner / splitter and the second combiner / splitter are located at both ends of the OPGW.

[0010] In an exemplary embodiment, the target optical signal is demodulated by the first optical signal receiving end to determine the polarization state rotation RSOP speed of the first detection optical signal during the OPGW transmission process, including: polarization state separation of the target optical signal by a second polarization beam splitter to obtain a first optical signal in a first polarization direction and a second optical signal in a second polarization direction, wherein the first polarization direction is perpendicular to the second polarization direction; the local oscillator light emitted by the local oscillator laser is divided into a first local oscillator light in the first polarization direction and a second local oscillator light in the second polarization direction by a third polarization beam splitter, wherein the target optical signal has the same wavelength as the local oscillator light; the RSOP speed is determined according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light, wherein the second polarization beam splitter and the third polarization beam splitter are located at the first optical signal receiving end.

[0011] In an exemplary embodiment, the RSOP speed is determined according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light, including: combining the first optical signal and the first local oscillator light through a second optical fiber coupler, and performing photoelectric conversion on the combined optical signal through a first balanced receiver to obtain a first electrical signal; and combining the second optical signal and the second local oscillator light through a third optical fiber coupler, and performing photoelectric conversion on the combined optical signal through a second balanced receiver to obtain a second electrical signal; determining the RSOP speed according to the first electrical signal and the second electrical signal, wherein the second optical fiber coupler and the third optical fiber coupler are located at the first optical signal receiving end.

[0012] In an exemplary embodiment, determining the RSOP speed based on the first electrical signal and the second electrical signal includes: converting the first electrical signal into a first digital signal through a first analog-to-digital converter; and converting the second electrical signal into a second digital signal through a second analog-to-digital converter; and using an adaptive equalization algorithm to determine the RSOP speed based on the first digital signal and the second digital signal.

[0013] In an exemplary embodiment, determining the lightning current value according to the RSOP speed includes: obtaining a mapping table, wherein the mapping table contains different lightning current values ​​corresponding to different RSOP speeds; and using the mapping table to determine the lightning current value corresponding to the RSOP speed of the first detection light signal during the OPGW transmission process.

[0014] In an exemplary embodiment, after determining the lightning strike current value according to the RSOP speed, the method further includes: when the RSOP speed meets a preset condition and the first detection light signal is transmitted to the OPGW through a circulator, determining a first receiving moment when the first light signal receiving end receives the scattered signal, wherein the first light signal transmitting end and the first light signal receiving end are located at the same end of the OPGW; determining the lightning strike position where the lightning strike event occurs according to the emission moment when the first light signal transmitting end emits the first detection light signal and the first receiving moment.

[0015] In an exemplary embodiment, the lightning strike location is determined based on the emission time of the first detection optical signal emitted by the first optical signal transmitting end and the first receiving time, including: subtracting the emission time from the first receiving time to obtain a first time difference; determining a first distance based on the lightning strike delay time and the transmission speed of the optical signal in the optical fiber, wherein the lightning strike delay time is half of the first time difference; and determining the lightning strike location based on the position of the first optical signal transmitting end and the first distance.

[0016] In an exemplary embodiment, the method further includes: generating a second detection optical signal through a second optical signal transmitting end, and transmitting the second detection optical signal to an optical fiber composite overhead ground wire OPGW, wherein the second detection optical signal is a modulated optical signal, and the second detection optical signal has two mutually perpendicular polarization components; acquiring a third detection optical signal from the OPGW through a second optical signal receiving end, wherein the third detection optical signal is the second detection optical signal after being transmitted through the OPGW; demodulating the third detection optical signal through the second optical signal receiving end, and determining the polarization state rotation RSOP speed of the second detection optical signal during the transmission process of the OPGW; wherein the wavelengths of the first detection optical signal and the second detection optical signal are different, the first optical signal transmitting end and the first optical signal receiving end are located at two ends of the OPGW, the second optical signal transmitting end and the second optical signal receiving end are located at two ends of the OPGW, and the first optical signal transmitting end and the second optical signal transmitting end are located at two ends of the OPGW.

[0017] In an exemplary embodiment, the method further includes: when the RSOP speed of the first detection optical signal during the transmission process of the OPGW and the RSOP speed of the second detection optical signal during the transmission process of the OPGW both meet preset conditions, determining a first receiving moment when the first optical signal receiving end receives the target optical signal and determining a second receiving moment when the second optical signal receiving end receives the third detection optical signal; determining a lightning strike position where the lightning strike event occurs based on the first receiving moment and the second receiving moment.

[0018] In an exemplary embodiment, the lightning strike position where the lightning strike event occurs is determined based on the first receiving moment and the second receiving moment, including: when the first receiving moment is equal to the second receiving moment, the lightning strike position is located in the middle position of the OPGW; when the first receiving moment is not equal to the second receiving moment, a second time difference between the first receiving moment and the second receiving moment is determined; a second distance is determined based on the second time difference and the transmission speed of the optical signal in the optical fiber; and the lightning strike position is determined based on the length of the OPGW, the second distance, and the endpoint position of the OPGW.

[0019] According to another embodiment of the present invention, a system for determining a lightning current value is provided, comprising: a first optical signal transmitting end, used to generate a first detection optical signal, and transmit the first detection optical signal to an optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; a first optical signal receiving end, used to obtain a target optical signal from the OPGW; demodulate the target optical signal, and determine the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; wherein the target optical signal is the first detection optical signal or a scattered signal after being transmitted through the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW; a network management device, used to determine the lightning current value according to the RSOP speed, wherein the lightning current value is the current value of the lightning current generated on the peripheral cable of the OPGW in the event of a lightning strike.

[0020] According to yet another embodiment of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the steps of any one of the above method embodiments when run.

[0021] According to yet another embodiment of the present invention, there is provided an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0022] The present invention generates a first detection optical signal through a first optical signal transmitting end, and transmits the first detection optical signal to an optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; obtains a target optical signal from OPGW through a first optical signal receiving end, wherein the target optical signal is a first detection optical signal or a scattered signal after being transmitted through OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of OPGW; demodulates the target optical signal through the first optical signal receiving end, determines the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of OPGW; determines the lightning current value according to the RSOP speed. Since the lightning current value is determined according to the RSOP speed, the current value of the lightning current generated by the lightning strike on the peripheral cable of OPGW can be accurately determined, which solves the problem that the current value of the lightning current generated by the lightning strike on the peripheral cable of OPGW cannot be accurately determined in the related art, and achieves the technical effect that the operation and maintenance personnel can accurately judge the lightning hazard to determine whether to repair quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a hardware structure block diagram of a mobile terminal of a method for determining a lightning current value according to an embodiment of the present invention;

[0024] Figure 2 is a flow chart of a method for determining a lightning current value according to an embodiment of the present invention;

[0025] Figure 3 is a structural block diagram of a detection light transmitting end and a detection light receiving end according to an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram comparing RSOP and lightning current value according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the change and relative change of the polarization states of X and Y of a detection light according to an embodiment of the present invention;

[0028] Figure 6 A system architecture for determining a lightning current value and a lightning strike position according to an embodiment of the present invention;

[0029] Figure 7 Another system architecture for determining a lightning current value and a lightning strike position according to an embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of determining a lightning strike location according to an embodiment of the present invention;

[0031] Fig. 9 It is a structural block diagram of a system for determining a lightning current value according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0034] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for determining a lightning current value according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, MCU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0035] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for determining the lightning current value in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0036] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0037] In this embodiment, a method for determining a lightning current value is provided, including but not limited to being applied in a lightning current value determination system. Figure 2 is a flow chart of a method for determining a lightning current value according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps S202-S208:

[0038] Step S202, generating a first detection optical signal through a first optical signal transmitting end, and transmitting the first detection optical signal to an optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components;

[0039] It should be noted that OPGW is an optical fiber unit for communication in the ground wire of the power transmission line. It has two functions: one is to serve as a lightning protection line for the transmission line, providing shielding protection for the transmission line against lightning strikes and discharges; the other is that the optical fiber combined in the ground wire serves as a medium for transmitting optical signals.

[0040] Step S204, obtaining a target optical signal from the OPGW through the first optical signal receiving end, wherein the target optical signal is a first detection optical signal or a scattered signal after being transmitted by the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW;

[0041] It should be noted that lightning strikes will cause lightning currents to be generated on the peripheral cables of the OPGW, thereby generating a magnetic field in the same direction as the light. According to the Faraday effect, the magnetic field causes the polarization states of the X and Y polarization components of the optical signal transmitted in the optical fiber to rotate rapidly, causing the optical field of the inner optical fiber of the OPGW to change.

[0042] As an optional example, in the case where the target optical signal is the first detection optical signal after being transmitted by the OPGW, the first optical signal transmitting end and the first optical signal receiving end are located at two ends of the OPGW. Figure 3 As shown, the first optical signal transmitting end is the detection light transmitting end in direction A, and the first optical signal receiving end is the detection light receiving end in direction A ( Figure 3 (not shown in the figure). In the case where the target optical signal is a scattered signal, the first optical signal transmitting end and the first optical signal receiving end are located at the same end of the OPGW, such as Figure 7 As shown, the first optical signal transmitting end is Figure 7 The detection light transmitting end in the first optical signal receiving end is Figure 7 The detection light receiving end in .

[0043] Step S206, demodulating the target optical signal through the first optical signal receiving end to determine the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW;

[0044] As an optional example, the rotation of state of polarization (RSOP) speed is the RSOP speed of the first polarization state or the second polarization state, or the average RSOP speed of the first polarization state and the second polarization state, and the polarization direction of the first polarization state is perpendicular to the polarization direction of the second polarization state.

[0045] Step S208, determining a lightning current value according to the RSOP speed, wherein the lightning current value is a current value of a lightning current generated on the OPGW peripheral cable when a lightning strike occurs.

[0046] In the above steps, a first detection optical signal is generated by a first optical signal transmitting end, and the first detection optical signal is transmitted to the optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; a target optical signal is obtained from the OPGW by a first optical signal receiving end, wherein the target optical signal is the first detection optical signal or a scattered signal after being transmitted through the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW; the target optical signal is demodulated by the first optical signal receiving end to determine the RSOP speed of the polarization state rotation of the first detection optical signal during the transmission process of the OPGW; and the lightning current value is determined according to the RSOP speed. Since the lightning current value is determined according to the RSOP speed, the current value of the lightning current generated by the lightning strike on the peripheral cable of the OPGW can be accurately determined, which solves the problem that the current value of the lightning current generated by the lightning strike on the peripheral cable of the OPGW cannot be accurately determined in the related art, and the technical effect that the operation and maintenance personnel can accurately judge the lightning hazard to determine whether to repair quickly is achieved.

[0047] In an exemplary embodiment, generating a first detection optical signal by a first optical signal transmitting end includes the following steps S11-S13:

[0048] Step S11: using a narrow-band laser to emit a detection light, and dividing the detection light into a first polarized light in a first polarization direction and a second polarized light in a second polarization direction through a first polarization beam splitter, wherein the first polarization direction is perpendicular to the second polarization direction;

[0049] Step S12: combining the first polarized light and the second polarized light through a first optical fiber coupler to obtain a combined light source;

[0050] As an optional example, the first optical fiber coupler is an X coupler, and by using the X coupler, optical signals of X (first polarization direction) and Y (second polarization direction) polarization components are combined together so that they share the same output channel. In this case, the X coupler combines the optical signals of X and Y polarization components into a composite output signal, and the composite signal contains information of the X and Y polarization components.

[0051] It should be noted that the advantage of combining the first polarized light and the second polarized light before modulation is that one modulator can be omitted. Otherwise, modulation signals need to be loaded separately to modulate the first polarized light and the second polarized light respectively so that the optical modulator can modulate them.

[0052] Step S13: modulating the combined light source using an adjustment signal through an optical modulator to obtain the first detection light signal, wherein the narrowband laser, the first polarization beam splitter, the first fiber coupler, and the optical modulator are located in the first optical signal transmitting end.

[0053] It should be noted that an optical modulator is a device used to control optical signals. Its main function is to change certain characteristics of optical signals, such as intensity, phase or frequency. Optical modulators are commonly used in optical communications, optical sensing, and optical signal processing. The output of an optical modulator depends on the modulation technology used. Common optical modulator outputs can be one of the following forms:

[0054] 1. Intensity Modulation: An optical modulator modulates an optical signal by changing the intensity of the optical signal. The output can be an intensity modulated optical signal, where the intensity of the light varies over time.

[0055] 2. Phase Modulation: An optical modulator modulates an optical signal by changing its phase. The output can be a phase modulated optical signal, where the phase of the light varies in time.

[0056] 3. Frequency Modulation: An optical modulator modulates an optical signal by changing the frequency of the optical signal. The output can be a frequency modulated optical signal, where the frequency of the light varies in time.

[0057] In order to better understand the above steps S11-S13, the following Figure 3 For specific instructions, such as Figure 3 As shown in the figure, a narrowband laser is used as the probe light source, and the A direction is represented by λa. The polarization beam splitter (PBS) divides the light source generated by the narrowband laser into two mutually perpendicular X and Y polarization components, and the X coupler realizes the combination of the X and Y polarization components. The modulated signal of the probe light is loaded onto the light source after the X and Y polarization components are combined through the modulator, and then the modulated signal is transmitted to the optical fiber.

[0058] It should be noted that if same-fiber detection is desired in directions A and B, the narrowband lasers in directions A and B can use different wavelengths, and a combiner / splitter can be used to combine the transmit signal in direction A and the receive signal in direction B. Similarly, the receive signal in direction A and the transmit signal in direction B can be combined at the other end.

[0059] In an exemplary embodiment, transmitting the first detection optical signal to the optical fiber composite overhead ground wire OPGW includes: transmitting the first detection optical signal to the OPGW through a circulator; obtaining the target optical signal from the OPGW through the first optical signal receiving end, including: obtaining the scattered signal from the circulator through the first optical signal receiving end, wherein the first optical signal receiving end and the first optical signal transmitting end are located at the same end of the OPGW.

[0060] That is, if the first detection optical signal is transmitted to the OPGW through a circulator, the first optical signal receiving end can obtain the scattered signal from the circulator, specifically, Figure 7 As shown, the first optical signal transmitting end can send the first detection optical signal to the circulator port 1, and then the circulator transmits the first detection optical signal to the OPGW through the circulator port 2. When the detection optical signal is transmitted along the optical fiber, due to Rayleigh scattering, Fresnel reflection, etc., a detection light backscattering signal opposite to the transmission direction of the detection optical signal is generated, which passes through the circulator port 2 and returns to the detection optical receiving end through the circulator port 3, and then the first optical signal receiving end can obtain the scattered signal from the circulator.

[0061] In an exemplary embodiment, transmitting the first detection optical signal to the optical fiber composite overhead ground wire OPGW includes: transmitting the first detection optical signal to the OPGW through a first combiner / splitter; obtaining a target optical signal from the OPGW through a first optical signal receiving end, including: obtaining the first detection optical signal after transmission through the OPGW from a second combiner / splitter through the first optical signal receiving end, wherein the first combiner / splitter and the second combiner / splitter are located at both ends of the OPGW.

[0062] That is, if the first optical signal transmitting end transmits the first detection optical signal to the OPGW through the first wavelength combiner / demultiplexer, the first optical signal receiving end can obtain the first detection optical signal transmitted through the OPGW from the second wavelength combiner / demultiplexer.

[0063] In an exemplary embodiment, the target optical signal is demodulated by the first optical signal receiving end to determine the polarization state rotation RSOP speed of the first detection optical signal during the OPGW transmission process, including the following steps S21-S23:

[0064] Step S21: performing polarization state separation on the target optical signal by a second polarization beam splitter to obtain a first optical signal in a first polarization direction and a second optical signal in a second polarization direction, wherein the first polarization direction is perpendicular to the second polarization direction;

[0065] Step S22: splitting the local oscillator light emitted by the local oscillator laser into a first local oscillator light in the first polarization direction and a second local oscillator light in the second polarization direction by a third polarization beam splitter, wherein the target optical signal has the same wavelength as the local oscillator light;

[0066] It should be noted that there is no specific execution order for the above steps S21 and S22, that is, step S21 may be executed first, or step S22 may be executed first.

[0067] As an optional example, the first polarization beam splitter, the second polarization beam splitter, and the third polarization beam splitter may be polarization beam splitters of the same type.

[0068] Step S23: determining the RSOP speed according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light, wherein the second polarization beam splitter and the third polarization beam splitter are located at the first optical signal receiving end.

[0069] In an exemplary embodiment, the above step S23 can be implemented by the following steps S31-S33:

[0070] Step S31: combining the first optical signal and the first local oscillator light through a second optical fiber coupler, and performing photoelectric conversion on the combined optical signal through a first balanced receiver to obtain a first electrical signal;

[0071] Step S32: combining the second optical signal and the second local oscillator light through a third optical fiber coupler, and performing photoelectric conversion on the combined optical signal through a second balanced receiver to obtain a second electrical signal;

[0072] As an optional example, the second optical fiber coupler and the third optical fiber coupler are an X-coupler, that is, the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler can be the same optical fiber coupler.

[0073] It should be noted that there is no specific execution order for the above steps S31 and S32, that is, step S31 may be executed first, or step S32 may be executed first.

[0074] Step S33: determining the RSOP speed according to the first electrical signal and the second electrical signal, wherein the second optical fiber coupler and the third optical fiber coupler are located at the first optical signal receiving end.

[0075] In an exemplary embodiment, the above step S33 can be implemented by the following steps S41-S43:

[0076] Step S41: converting the first electrical signal into a first digital signal through a first analog-to-digital converter;

[0077] Step S42: converting the second electrical signal into a second digital signal by a second analog-to-digital converter;

[0078] It should be noted that there is no specific execution order for the above step S41 and step S42, that is, step S41 can be executed first, or step S42 can be executed first.

[0079] Step S43: using an adaptive equalization algorithm to determine the RSOP speed according to the first digital signal and the second digital signal.

[0080] For a better understanding, the following is a detailed description. Figure 3 As shown, the optical signal receiving end first separates the polarization state of the detection signal light transmitted through the OPGW through the PBS, and then divides it into two beams of light with polarization directions perpendicular to each other through another PBS with the local oscillator laser of the same wavelength. A beam of local oscillator light polarized in the X direction and the signal light polarized in the X direction are combined into a balanced receiver through an X coupler; a beam of local oscillator light polarized in the Y direction and the signal light polarized in the Y direction are combined into another balanced receiver through another X coupler; and then the two balanced receivers respectively complete the photoelectric conversion of the mixed optical signal, and transmit it to the ADC respectively to complete the analog-to-digital conversion of the electrical signal, and then use the adaptive equalization algorithm to demodulate these data to obtain the RSOP speeds of the two polarization states X and Y on the detection light modulation signal.

[0081] In an exemplary embodiment, the above step S208 can be implemented in the following manner: obtain a mapping table, wherein the mapping table contains different lightning current values ​​corresponding to different RSOP speeds; use the mapping table to determine the lightning current value corresponding to the RSOP speed of the first detection light signal during the OPGW transmission process.

[0082] It should be noted that the RSOP speed is proportional to the lightning current value. As an optional example, the corresponding relationship between the RSOP speed and the lightning current value is as follows: Figure 4 shown.

[0083] It should be noted that after determining the lightning strike current value according to the RSOP speed, the location where the lightning strike occurs may also be determined. Specifically, in an exemplary embodiment, the location where the lightning strike occurs may be determined by following steps S51-S52:

[0084] Step S51: when the RSOP speed meets a preset condition and the first detection optical signal is transmitted to the OPGW through a circulator, determining a first receiving time at which the first optical signal receiving end receives the scattered signal, wherein the first optical signal transmitting end and the first optical signal receiving end are located at the same end of the OPGW;

[0085] It should be noted that the preset condition includes: the RSOP speed is the maximum of all RSOP speeds determined within a preset detection time.

[0086] Step S52: determining a lightning strike position where the lightning strike event occurs according to the emission time of the first detection light signal emitted by the first light signal transmitting end and the first receiving time.

[0087] In an exemplary embodiment, the above step S52 can be implemented in the following manner: subtract the transmission time from the first reception time to obtain a first time difference; determine the first distance based on the lightning strike delay time and the transmission speed of the optical signal in the optical fiber, wherein the lightning strike delay time is half of the first time difference; determine the lightning strike position based on the position of the first optical signal transmitting end and the first distance.

[0088] It should be noted that, since the transmission time of the first detection optical signal in the OPGW is the same as the transmission time of the scattered signal corresponding to the first detection optical signal in the OPGW, if the transmission time is t1 and the first receiving time is t2, the actual time of the lightning strike is t1+(t2-t1) / 2. Since the transmission speed of the optical signal in the optical fiber is known, the first distance between the location where the lightning strike occurs and the first optical signal transmitting end can be determined, and then the lightning strike location can be determined based on the first distance and the location of the first optical signal transmitting end. It should be noted that, in this case, the first optical signal transmitting end and the first optical signal receiving end are located at the same location.

[0089] In an exemplary embodiment, the method for determining the lightning current value further includes the following steps S61-S62:

[0090] Step S61: generating a second detection optical signal through a second optical signal transmitting end, and transmitting the second detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the second detection optical signal is a modulated optical signal, and the second detection optical signal has two mutually perpendicular polarization components;

[0091] Step S61: acquiring a third detection optical signal from the OPGW through the second optical signal receiving end, wherein the third detection optical signal is the second detection optical signal after being transmitted by the OPGW;

[0092] Demodulating the third detection optical signal by the second optical signal receiving end, and determining the polarization state rotation RSOP speed of the second detection optical signal during the transmission process of the OPGW;

[0093] Among them, the wavelengths of the first detection optical signal and the second detection optical signal are different, the first optical signal transmitting end and the first optical signal receiving end are located at two ends of the OPGW, the second optical signal transmitting end and the second optical signal receiving end are located at two ends of the OPGW, and the first optical signal transmitting end and the second optical signal transmitting end are located at two ends of the OPGW.

[0094] For better understanding, Figure 6 The first optical signal transmitting end and the first optical signal receiving end can be the signal transmitting end and the signal receiving end in direction A, and the second optical signal transmitting end and the second optical signal receiving end can be the signal transmitting end and the signal receiving end in direction B, wherein direction A and direction B are two opposite directions.

[0095] In an exemplary embodiment, the location where the lightning strike occurs may be determined by following the steps S71-S72:

[0096] Step S71: when the RSOP speed of the first detection optical signal during the transmission process of the OPGW and the RSOP speed of the second detection optical signal during the transmission process of the OPGW both meet preset conditions, determining a first receiving time when the first optical signal receiving end receives the target optical signal and determining a second receiving time when the second optical signal receiving end receives the third detection optical signal;

[0097] Step S72: determining the lightning strike location where the lightning strike event occurs according to the first receiving time and the second receiving time.

[0098] In an exemplary embodiment, the above-mentioned step S72 can be implemented in the following manner: when the first receiving moment is equal to the second receiving moment, the lightning strike position is located in the middle position of the OPGW; when the first receiving moment is not equal to the second receiving moment, the second time difference between the first receiving moment and the second receiving moment is determined; the second distance is determined according to the second time difference and the transmission speed of the optical signal in the optical fiber; the lightning strike position is determined according to the length of the OPGW, the second distance and the endpoint position of the OPGW.

[0099] It should be noted that if the first receiving moment is equal to the second receiving moment, it means that after the lightning strike occurs, the time for the detection light signal in direction A and the detection light signal in direction B to be transmitted in OPGW is the same, and since the transmission speed of the optical signal in the optical fiber is fixed, it means that the lightning strike position is located in the middle of the OPGW. If the first receiving moment is not equal to the second receiving moment, the difference in the transmission distance of the detection light signal in direction A and the detection light signal in direction B in OPGW after the lightning strike occurs can be determined based on the second time difference between the first receiving moment and the second receiving moment. Since the length of OPGW is determined, the transmission distance of the detection light signal in direction A and the detection light signal in direction B in OPGW after the lightning strike occurs can be determined separately, and then the lightning strike position is determined in combination with the endpoint position of OPGW. It should be noted that the endpoint position of OPGW includes one of the following: the position of the first optical signal transmitting end, the position of the second optical signal transmitting end, the position of the first optical signal receiving end, and the position of the second optical signal receiving end. The position of the first optical signal transmitting end is the same as the position of the second optical signal receiving end, and the position of the second optical signal transmitting end is the same as the position of the first optical signal receiving end.

[0100] Obviously, the above-described embodiments are only embodiments of a part of the present invention, rather than all embodiments. In order to better understand the above method, the above process is described below in conjunction with embodiments, but it is not intended to limit the technical solutions of the embodiments of the present invention, specifically:

[0101] In an exemplary embodiment, since a lightning strike will generate a lightning current on the peripheral cable of the OPGW, thereby generating a magnetic field in the same direction as the light, according to the Faraday effect, the magnetic field will cause the optical field of the inner fiber of the OPGW to change, and the polarization state of the X and Y polarization components of the optical signal transmitted in the optical fiber will rotate rapidly. Further, with the help of this principle and the known proportional relationship between the intensity of the lightning current and the change in ROSP, the modulated detection light with time information can be modulated in two polarization directions by emitting the optical fiber of the OPGW, and the polarization state rotation speed of the detection light during the light transmission process can be demodulated by the receiving end using an adaptive equalization algorithm, and then the intensity and position of the lightning current when the lightning strike occurs can be detected by detecting the polarization state rotation speed and RSOP peak position of the detection signal. That is, the embodiment of the present application can locate the location and intensity of the lightning strike by demodulating the polarization state rotation information (RSOP) in the adaptive recovery process of the detection signal modulation signal. Compared with the method of using a polarizer and an analyzer to detect the change in the polarization state of an optical signal, this method is simple to implement, has a large amount of information available, and is more accurate in judgment; compared with the method of using PMD changes to judge the location of a lightning strike, the intensity of the lightning current can be evaluated, which is convenient for operation and maintenance personnel to judge the degree of damage caused by the lightning strike and determine whether to repair it quickly. In addition, compared with the PMD method, the RSOP method focuses more on the rotation speed of the polarization state rather than the amplitude, is less susceptible to interference from other factors, and has a more accurate result. For a better understanding, the following is described in conjunction with specific embodiments.

[0102] Example 1

[0103] In an exemplary embodiment, the specific principle is as follows Figure 3 As shown, specifically:

[0104] Detection signal light transmitting end: Use narrowband laser as the detection light source. PBS divides the light source generated by the narrowband laser into two mutually perpendicular X and Y polarization components. The X coupler realizes the combination of X and Y polarization components. The modulation signal of the detection light is loaded onto the light source after the X and Y polarization components are combined through the optical modulator. The advantage of combining the X and Y polarization components before the modulator is that one modulator can be saved. Otherwise, the modulation signals need to be loaded separately and modulated by their own modulators. The detection light transmitting end transmits the modulated optical signal to the optical fiber. If you want to detect the same fiber in A and B directions, you can use different wavelengths for the narrowband lasers in A and B directions, and use a combiner to combine the A-direction transmission signal and the B-direction reception signal. Similarly, combine the A-direction reception signal with the B-direction transmission signal at the opposite end.

[0105] Detection light receiving end: The detection signal light transmitted through the line is first polarized by PBS, and then separated into two beams of light with polarization directions perpendicular to each other by another PBS with the local oscillator laser of the same wavelength. A beam of local oscillator light polarized in the X direction and the signal light polarized in the X direction are combined into a balanced receiver through an X coupler. A beam of local oscillator light polarized in the Y direction and the signal light polarized in the Y direction are combined into another balanced receiver through another X coupler.

[0106] The two balanced receivers complete the photoelectric conversion of the mixed optical signal respectively, and transmit it to the ADC respectively to complete the analog-to-digital conversion of the electrical signal. The adaptive equalization algorithm can demodulate the change information of the X and Y polarization states on the detection light modulation signal. It mainly includes three aspects of information, the change of X polarization state, the change of Y polarization state and the relative polarization change of X and Y.

[0107] This change information is transmitted to the network manager (referred to as the network manager) through the WEB network or OSC. The RSOP change can be obtained on the network manager and converted into lightning current intensity and the location of the lightning strike can be calculated through time delay. If the OPGW is struck by lightning, the lightning strike location and lightning current intensity can be calculated.

[0108] Figure 4 The comparison diagram between lightning current and RSOP rotation speed on X and Y polarizations is shown. Using this conversion relationship, by adaptively recovering the modulated signal loaded on the two polarization X and Y components of the detection light and demodulating the polarization rotation, it can be detected that the rotation speed of RSOP reaches 20Mrad / s, corresponding to a lightning current of more than 350KA.

[0109] Figure 5 The diagram illustrates the polarization state rotation of the X and Y polarization components when the detection light is transmitted in the optical fiber, as well as the relative delay of the X and Y polarization components, i.e., the PMD situation. The present application can also calculate the PMD change of the detection light by performing an adaptive recovery algorithm on the modulated signal loaded on the two polarization X and Y components of the detection light. This data can also assist in confirming the location information of the lightning strike detected by RSOP.

[0110] Figure 6 The system architecture for determining the intensity and location of a lightning strike based on the RSOP speed of the detection light is illustrated. The figure shows the block diagram of the transmitter and receiver with different wavelengths of detection light in directions A and B.

[0111] The X polarization state change, Y polarization state change and X and Y relative polarization change information obtained by the receiving end in direction A and direction B are transmitted to the network management through the WEB network or OSC. The RSOP change can be obtained on the network management and converted into lightning current intensity and the location of the lightning strike can be calculated through time delay.

[0112] Example 2

[0113] In an exemplary embodiment, the specific principle is as follows Figure 7 As shown, specifically:

[0114] Detection light transmitting end: Use narrowband laser as the detection light source. PBS divides the light source generated by the narrowband laser into two mutually perpendicular X and Y polarization components. The X coupler realizes the combination of X and Y polarization components. The modulated signal of the detection light is loaded onto the light source after the X and Y polarization components are combined through the modulator. The advantage of combining the X and Y polarization components before the modulator is that one modulator can be saved. Otherwise, the modulation signals need to be loaded separately and modulated by their own modulators. The detection light transmitter sends the modulated signal into the circulator port 1 and transmits it to the line through the circulator port 2.

[0115] When the detection signal is transmitted along the optical fiber, due to Rayleigh scattering, Fresnel reflection, etc., a detection light backscattering signal opposite to the detection light transmission direction is generated, which passes through the circulator port 2 and returns to the detection light receiving part through the circulator port 3 for processing.

[0116] Detection light receiving end: The detection signal light transmitted through the line is first polarized through the PBS. The laser signal at the transmitting end is separated into one beam through the X coupler as the receiving part. The local oscillator light is divided into two beams of light with mutually perpendicular polarization directions through another PBS. A beam of local oscillator light polarized in the X direction and the signal light polarized in the X direction are combined into a balanced receiver through an X coupler. A beam of local oscillator light polarized in the Y direction and the signal light polarized in the Y direction are combined into another balanced receiver through another X coupler.

[0117] The two balanced receivers respectively complete the photoelectric conversion of the mixed optical signal and transmit it to the ADC to complete the analog-to-digital conversion of the electrical signal. The adaptive equalization algorithm can demodulate the change information of the X and Y polarization states of the detection light modulation signal. The specific scheme is the same as that of Example 1.

[0118] The location of the lightning strike can also be detected by RSOP rotation, such as Figure 8 As shown in the figure, since the time of the detection light emission is known, as t0, the RSOP peak time obtained through the backscattered signal is ta. Since the detection light is transmitted back and forth in the same optical fiber, (ta-t0) / 2 is the delay information of the RSOP peak detecting the lightning strike. According to the G.652 optical fiber delay of 5us / 1km, the lightning strike location La can be deduced. It can be displayed on the network management as follows Figure 8 Express.

[0119] It should be noted that the present application proposes a method based on the principle that a lightning strike will cause a rapid rotation of the polarization state of the detection signal in the optical fiber (OPGW), and the rotation speed is proportional to the intensity of the lightning current. A corresponding transmitter and receiver are designed that use the detection signal transmitted in the optical fiber to obtain the lightning strike intensity and position.

[0120] This application is applicable to the power industry, national and provincial trunk scenarios, supporting WDM / OTN systems, and supporting lightning detection functions to analyze the degree of damage and location of the line after being struck by lightning, thereby improving intelligent operation and maintenance capabilities.

[0121] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory (ROM / RAM), a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (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 invention.

[0122] In this embodiment, a lightning current value determination system is also provided, and the lightning current value determination system is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the lightning current value determination system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0123] Fig. 9 is a structural block diagram of a system for determining a lightning current value according to an embodiment of the present invention. Fig. 9 As shown, the system includes:

[0124] A first optical signal transmitting end 92 is used to generate a first detection optical signal and transmit the first detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal and has two mutually perpendicular polarization components;

[0125] The first optical signal receiving end 94 is used to obtain a target optical signal from the OPGW; demodulate the target optical signal to determine the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; wherein the target optical signal is the first detection optical signal or the scattered signal after being transmitted through the OPGW, and the scattered signal is the signal reflected back by the first detection optical signal during the transmission process of the OPGW;

[0126] The network management device 96 is used to determine a lightning current value according to the RSOP speed, wherein the lightning current value is a current value of a lightning current generated on the OPGW peripheral cable when a lightning strike occurs.

[0127] The above system generates a first detection optical signal through a first optical signal transmitting end, and transmits the first detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; obtains a target optical signal from the OPGW through the first optical signal receiving end, wherein the target optical signal is the first detection optical signal or a scattered signal after being transmitted through the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW; demodulates the target optical signal through the first optical signal receiving end, determines the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; determines the lightning current value according to the RSOP speed. Since the lightning current value is determined according to the RSOP speed, the current value of the lightning current generated by the lightning strike on the peripheral cable of the OPGW can be accurately determined, which solves the problem that the current value of the lightning current generated by the lightning strike on the peripheral cable of the OPGW cannot be accurately determined in the related technology, and achieves the technical effect that the operation and maintenance personnel can accurately judge the lightning hazard to determine whether to repair quickly.

[0128] In an exemplary embodiment, the first optical signal transmitting end 92 is also used to transmit detection light using a narrowband laser, and divide the detection light into a first polarization light in a first polarization direction and a second polarization light in a second polarization direction through a first polarization beam splitter, wherein the first polarization direction is perpendicular to the second polarization direction; the first polarization light and the second polarization light are combined through a first optical fiber coupler to obtain a combined light source; and the combined light source is modulated using an adjustment signal through an optical modulator to obtain the first detection light signal, wherein the narrowband laser, the first polarization beam splitter, the first optical fiber coupler, and the optical modulator are located in the first optical signal transmitting end.

[0129] In an exemplary embodiment, the first optical signal transmitting end 92 is also used to transmit the first detection optical signal to the OPGW through a circulator; the first optical signal receiving end is also used to obtain the scattered signal from the circulator, wherein the first optical signal receiving end and the first optical signal transmitting end are located at the same end of the OPGW.

[0130] In an exemplary embodiment, the first optical signal transmitting end is also used to transmit the first detection optical signal to the OPGW through a first combiner / demultiplexer; the first optical signal receiving end is also used to obtain the first detection optical signal after transmission through the OPGW from a second combiner / demultiplexer, wherein the first combiner / demultiplexer and the second combiner / demultiplexer are located at both ends of the OPGW.

[0131] In an exemplary embodiment, the first optical signal receiving end 94 is also used to perform polarization state separation on the target optical signal through a second polarization beam splitter to obtain a first optical signal in a first polarization direction and a second optical signal in a second polarization direction, wherein the first polarization direction is perpendicular to the second polarization direction; the local oscillator light emitted by the local oscillator laser is divided into a first local oscillator light in the first polarization direction and a second local oscillator light in the second polarization direction through a third polarization beam splitter, wherein the target optical signal has the same wavelength as the local oscillator light; the RSOP speed is determined according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light, wherein the second polarization beam splitter and the third polarization beam splitter are located at the first optical signal receiving end.

[0132] In an exemplary embodiment, the first optical signal receiving end 94 is also used to realize the combination of the first optical signal and the first local oscillator light through a second optical fiber coupler, and perform photoelectric conversion on the combined optical signal through a first balanced receiver to obtain a first electrical signal; and realize the combination of the second optical signal and the second local oscillator light through a third optical fiber coupler, and perform photoelectric conversion on the combined optical signal through a second balanced receiver to obtain a second electrical signal; determine the RSOP speed according to the first electrical signal and the second electrical signal, wherein the second optical fiber coupler and the third optical fiber coupler are located at the first optical signal receiving end.

[0133] In an exemplary embodiment, the first optical signal receiving end 94 is also used to convert the first electrical signal into a first digital signal through a first analog-to-digital converter; and convert the second electrical signal into a second digital signal through a second analog-to-digital converter; and use an adaptive equalization algorithm to determine the RSOP speed based on the first digital signal and the second digital signal.

[0134] In an exemplary embodiment, the network management device 96 is also used to obtain a mapping table, wherein the mapping table contains different lightning current values ​​corresponding to different RSOP speeds; and use the mapping table to determine the lightning current value corresponding to the RSOP speed of the first detection light signal during the OPGW transmission process.

[0135] In an exemplary embodiment, the network management device 96 is also used to determine the first receiving moment when the first optical signal receiving end receives the scattered signal after determining the lightning current value according to the RSOP speed, when the RSOP speed meets a preset condition and the first detection optical signal is transmitted to the OPGW through a circulator, wherein the first optical signal transmitting end and the first optical signal receiving end are located at the same end of the OPGW; and determine the lightning strike position where the lightning strike event occurs according to the emission moment when the first optical signal transmitting end emits the first detection optical signal and the first receiving moment.

[0136] In an exemplary embodiment, the network management device 96 is also used to subtract the transmission time from the first reception time to obtain a first time difference; determine a first distance based on the lightning strike delay time and the transmission speed of the optical signal in the optical fiber, wherein the lightning strike delay time is half of the first time difference; and determine the lightning strike position based on the position of the first optical signal transmitting end and the first distance.

[0137] In an exemplary embodiment, the system further includes: a second optical signal transmitting end, a second optical signal receiving end;

[0138] A second optical signal transmitting end is used to generate a second detection optical signal and transmit the second detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the second detection optical signal is a modulated optical signal and has two mutually perpendicular polarization components;

[0139] The second optical signal receiving end is used to obtain a third detection optical signal from the OPGW, demodulate the third detection optical signal, and determine the polarization state rotation RSOP speed of the second detection optical signal during the transmission process of the OPGW; wherein the third detection optical signal is the second detection optical signal after being transmitted through the OPGW; wherein the wavelengths of the first detection optical signal and the second detection optical signal are different, the first optical signal transmitting end and the first optical signal receiving end are located at two ends of the OPGW, the second optical signal transmitting end and the second optical signal receiving end are located at two ends of the OPGW, and the first optical signal transmitting end and the second optical signal transmitting end are located at two ends of the OPGW.

[0140] In an exemplary embodiment, the network management device 96 is also used to determine the first receiving moment when the first optical signal receiving end receives the target optical signal and the second receiving moment when the second optical signal receiving end receives the third detection optical signal when the RSOP speed of the first detection optical signal during the OPGW transmission process and the RSOP speed of the second detection optical signal during the OPGW transmission process both meet preset conditions; and determine the lightning strike position where the lightning strike event occurs based on the first receiving moment and the second receiving moment.

[0141] In an exemplary embodiment, the network management device 96 is also used to determine that when the first receiving moment is equal to the second receiving moment, the lightning strike position is located in the middle position of the OPGW; when the first receiving moment is not equal to the second receiving moment, determine the second time difference between the first receiving moment and the second receiving moment; determine the second distance according to the second time difference and the transmission speed of the optical signal in the optical fiber; determine the lightning strike position according to the length of the OPGW, the second distance, and the endpoint position of the OPGW.

[0142] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0143] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0144] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0145] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0146] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0147] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0148] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0149] The above description is only a preferred embodiment of the present invention and is 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 principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining a lightning current value, characterized in that: include: Generate a first detection optical signal through a first optical signal transmitting end, and transmit the first detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal, and the first detection optical signal has two mutually perpendicular polarization components; Acquire a target optical signal from the OPGW through a first optical signal receiving end, wherein the target optical signal is a first detection optical signal or a scattered signal after being transmitted by the OPGW, and the scattered signal is a signal reflected back by the first detection optical signal during the transmission process of the OPGW; Demodulating the target optical signal by the first optical signal receiving end, and determining the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; A lightning current value is determined according to the RSOP speed, wherein the lightning current value is a current value of a lightning current generated on the OPGW peripheral cable when a lightning strike event occurs.

2. The method according to claim 1, characterized in that: Generating a first detection optical signal through a first optical signal transmitting end includes: Using a narrowband laser to emit a detection light, and splitting the detection light into a first polarization light in a first polarization direction and a second polarization light in a second polarization direction by a first polarization beam splitter, wherein the first polarization direction is perpendicular to the second polarization direction; Combine the first polarized light and the second polarized light by using a first optical fiber coupler to obtain a combined light source; The combined light source is modulated by an adjustment signal through an optical modulator to obtain the first detection light signal, wherein the narrowband laser, the first polarization beam splitter, the first fiber coupler, and the optical modulator are located in the first optical signal transmitting end.

3. The method according to claim 1, characterized in that Transmitting the first detection optical signal to an optical fiber composite overhead ground wire OPGW, comprising: transmitting the first detection optical signal to the OPGW through a circulator; Acquiring a target optical signal from the OPGW through a first optical signal receiving end includes: acquiring the scattered signal from the circulator through the first optical signal receiving end, wherein the first optical signal receiving end and the first optical signal transmitting end are located at the same end of the OPGW.

4. The method according to claim 1, characterized in that Transmitting the first detection optical signal to an optical fiber composite overhead ground wire OPGW, comprising: transmitting the first detection optical signal to the OPGW through a first combiner / demultiplexer; Obtaining a target optical signal from the OPGW through the first optical signal receiving end includes: obtaining a first detection optical signal after being transmitted by the OPGW from a second combiner / demultiplexer through the first optical signal receiving end, wherein the first combiner / demultiplexer and the second combiner / demultiplexer are located at two ends of the OPGW.

5. The method according to claim 1, characterized in that Demodulating the target optical signal by the first optical signal receiving end to determine the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW includes: Performing polarization state separation on the target optical signal by a second polarization beam splitter to obtain a first optical signal in a first polarization direction and a second optical signal in a second polarization direction, wherein the first polarization direction is perpendicular to the second polarization direction; Splitting the local oscillator light emitted by the local oscillator laser into a first local oscillator light in the first polarization direction and a second local oscillator light in the second polarization direction by a third polarization beam splitter, wherein the target optical signal has the same wavelength as the local oscillator light; The RSOP speed is determined according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light, wherein the second polarization beam splitter and the third polarization beam splitter are located at the first optical signal receiving end.

6. The method according to claim 5, characterized in that Determining the RSOP speed according to the first optical signal, the second optical signal, the first local oscillator light, and the second local oscillator light includes: Combining the first optical signal and the first local oscillator light by a second optical fiber coupler, and performing photoelectric conversion on the combined optical signal by a first balanced receiver to obtain a first electrical signal; and The second optical signal and the second local oscillator light are combined by a third optical fiber coupler, and the combined optical signal is subjected to photoelectric conversion by a second balanced receiver to obtain a second electrical signal; The RSOP speed is determined according to the first electrical signal and the second electrical signal, wherein the second optical fiber coupler and the third optical fiber coupler are located at the first optical signal receiving end.

7. The method according to claim 6, characterized in that Determining the RSOP speed according to the first electrical signal and the second electrical signal includes: Converting the first electrical signal into a first digital signal by a first analog-to-digital converter; and converting the second electrical signal into a second digital signal by a second analog-to-digital converter; The RSOP speed is determined based on the first digital signal and the second digital signal using an adaptive equalization algorithm.

8. The method according to claim 1, characterized in that: Determining a lightning current value according to the RSOP speed includes: Obtain a mapping table, wherein the mapping table contains different lightning current values ​​corresponding to different RSOP speeds; The mapping table is used to determine a lightning current value corresponding to the RSOP speed of the first detection light signal during transmission of the OPGW.

9. The method according to claim 1, characterized in that: After determining the lightning current value according to the RSOP speed, the method further includes: When the RSOP speed satisfies a preset condition and the first detection optical signal is transmitted to the OPGW through a circulator, determining a first receiving time when the first optical signal receiving end receives the scattered signal, wherein the first optical signal transmitting end and the first optical signal receiving end are located at the same end of the OPGW; The lightning strike position where the lightning strike event occurs is determined according to the emission time of the first detection light signal emitted by the first light signal transmitting end and the first receiving time.

10. The method according to claim 9, characterized in that Determining a lightning strike position according to a time at which the first detection optical signal is emitted by the first optical signal emitting end and the first receiving time includes: Subtract the transmitting time from the first receiving time to obtain a first time difference; Determine the first distance according to the lightning delay time and the transmission speed of the optical signal in the optical fiber, wherein the lightning delay time is half of the first time difference; The lightning strike position is determined according to the position of the first optical signal transmitting end and the first distance.

11. The method according to claim 1, characterized in that: The method further comprises: Generate a second detection optical signal through a second optical signal transmitting end, and transmit the second detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the second detection optical signal is a modulated optical signal, and the second detection optical signal has two mutually perpendicular polarization components; Obtaining a third detection optical signal from the OPGW through the second optical signal receiving end, wherein the third detection optical signal is the second detection optical signal after being transmitted by the OPGW; Demodulating the third detection optical signal by the second optical signal receiving end, and determining the polarization state rotation RSOP speed of the second detection optical signal during the transmission process of the OPGW; Among them, the wavelengths of the first detection optical signal and the second detection optical signal are different, the first optical signal transmitting end and the first optical signal receiving end are located at two ends of the OPGW, the second optical signal transmitting end and the second optical signal receiving end are located at two ends of the OPGW, and the first optical signal transmitting end and the second optical signal transmitting end are located at two ends of the OPGW.

12. The method according to claim 11, characterized in that The method further comprises: When the RSOP speed of the first detection optical signal during the transmission process of the OPGW and the RSOP speed of the second detection optical signal during the transmission process of the OPGW both meet preset conditions, determining a first receiving time when the first optical signal receiving end receives the target optical signal and determining a second receiving time when the second optical signal receiving end receives the third detection optical signal; A lightning strike location where the lightning strike event occurs is determined according to the first receiving time and the second receiving time.

13. The method according to claim 12, characterized in that Determining a lightning strike position where the lightning strike event occurs according to the first receiving time and the second receiving time includes: When the first receiving time is equal to the second receiving time, the lightning strike position is located at the middle position of the OPGW; When the first receiving moment is not equal to the second receiving moment, determine a second time difference between the first receiving moment and the second receiving moment; determine a second distance based on the second time difference and the transmission speed of the optical signal in the optical fiber; and determine a lightning strike location based on the length of the OPGW, the second distance and the endpoint position of the OPGW.

14. A system for determining a lightning current value, characterized in that: include: A first optical signal transmitting end is used to generate a first detection optical signal and transmit the first detection optical signal to the optical fiber composite overhead ground wire OPGW, wherein the first detection optical signal is a modulated optical signal and has two mutually perpendicular polarization components; A first optical signal receiving end is used to obtain a target optical signal from the OPGW; demodulate the target optical signal, and determine the polarization state rotation RSOP speed of the first detection optical signal during the transmission process of the OPGW; wherein the target optical signal is the first detection optical signal or the scattered signal after being transmitted through the OPGW, and the scattered signal is the signal reflected back by the first detection optical signal during the transmission process of the OPGW; The network management device is used to determine a lightning current value according to the RSOP speed, wherein the lightning current value is a current value of a lightning current generated on the OPGW peripheral cable when a lightning strike occurs.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program implements the steps of the method described in any one of claims 1 to 13 when executed by a processor.

16. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method described in any one of claims 1 to 13 are implemented.

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