Phase sequence live checking method, system and device and readable storage medium

Abstract

The invention discloses a phase sequence electrified checking method, system and device and a readable storage medium, and the method comprises the steps: obtaining an amplitude F1 and a phase X1 of a checking signal Z1 from a first end device under the condition that a first end injects the checking signal Z1 into a selected phase metal sheath; acquiring an amplitude F2 and a phase X2 of a transmission signal Z2 meeting a preset requirement from second end equipment; comparing the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and comparing the phase X1 with the phase X2 to obtain a phase comparison result; and according to an amplitude comparison result and a phase comparison result, determining a second end metal sheath corresponding to the selected second end metal sheath. Compared with a traditional method, the method has the advantages that a worker does not need to directly contact a cable sheath or a grounding system for signal measurement, safety is high, section-by-section power-off inspection is not needed, a grounding box does not need to be opened, efficiency is high, the checked signal is different from a field power frequency signal, and misjudgment is not prone to occurring.

Description

Technical Field

[0001] The invention relates to a phase sequence live calibration method, system, device and readable storage medium, belonging to the technical field of power transmission. Background Art

[0002] The metal sheath in the high-voltage cable line generates induced voltage and sheath circulating current due to electromagnetic induction, which may cause the metal sheath to overheat or be damaged, affecting the safety and efficiency of the transmission system. The cross-interconnected transposed grounding system significantly reduces the sheath voltage and circulating current by segmenting the metal sheath and cross-connecting it to the grounding device. However, this complex grounding system places higher demands on phase sequence verification. Traditional phase sequence verification methods have the following disadvantages: 1. The verification operation usually requires manual direct contact with the cable sheath or the grounding system for signal measurement. This method is not only complicated to operate, but also has high safety risks, especially in high-voltage environments; 2. The verification operation requires power outages and system inspections in sections, and the operation is time-consuming in long-distance cable networks. In some scenarios, the grounding box must be opened to directly inject signal detection into the metal sheath, which will reduce the operating efficiency of the transmission line; 3. For cross-interconnected grounding systems, the induced voltage caused by the current of each core wire on the sheath, in addition to itself, is also interfered by the induced voltage generated by the current in the metal sheaths of other two adjacent phases and the earth return current on the sheath. Similarly, lines laid in parallel with multiple loops also generate induced voltages on adjacent cable sheaths. Traditional verification methods are prone to misjudgment in signal perception and phase analysis. Summary of the invention

[0003] The present invention provides a phase sequence live calibration method, system, device and readable storage medium, which solve the problems disclosed in the background technology.

[0004] According to one aspect of the present disclosure, a phase sequence live calibration method is provided, comprising: In the case where the calibration signal Z1 is injected into the selected one-phase metal sheath at the first end, the amplitude F1 and phase X1 of the calibration signal Z1 are obtained from the first end device; wherein the first end is one end in the adjacent cross-connection box; the first end device is used to collect the calibration signal Z1 and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal; Acquire the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second end device; wherein the second end is the other end in the adjacent cross-connection box; the second end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements; Compare the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and compare the phase X1 with the phase X2 to obtain a phase comparison result; According to the amplitude comparison result and the phase comparison result, the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath is determined.

[0005] Furthermore, the injected calibration signal Z1 is a square wave signal with a non-harmonic frequency.

[0006] Furthermore, the preset requirement is not to filter the transmission signal, or to retain the transmission signal with the largest amplitude F2 and / or phase X2.

[0007] Further, the amplitude F1 is compared with the amplitude F2 to obtain an amplitude comparison result, including: Calculate the ratio of amplitude F2 to amplitude F1; The difference between the calculated ratio and the theoretical attenuation ratio; If the difference is within the first error range, the comparison between the amplitude F1 and the amplitude F2 passes.

[0008] Furthermore, the phase X1 is compared with the phase X2 to obtain a phase comparison result, including: Calculate the phase difference Δ between the phase X2 and the phase X1; Calculate the difference between the phase difference Δ and the theoretical phase difference; If the difference is within the second error range, the comparison between the phase X1 and the phase X2 is successful.

[0009] Further, according to the amplitude comparison result and the phase comparison result, determining the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath includes: If the amplitude F1 is matched with the amplitude F2 corresponding to the metal sheath S and the phase X1 is matched with the phase X2 corresponding to the metal sheath S, it is determined that the metal sheath S is consistent with the phase sequence of the selected metal sheath of one phase.

[0010] According to another aspect of the present disclosure, a phase sequence live calibration system is provided, comprising: The first-end acquisition module acquires the amplitude F1 and phase X1 of the calibration signal Z1 from the first-end device when the calibration signal Z1 is injected into the selected one-phase metal sheath at the first end; wherein the first end is one end in the adjacent cross-connection box; the first-end device is used to collect the calibration signal Z1 and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal; The second end acquisition module acquires the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second end device; wherein the second end is the other end in the adjacent cross-connection box; the second end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements; The comparison module compares the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and compares the phase X1 with the phase X2 to obtain a phase comparison result; The phase determination module determines the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath according to the amplitude comparison result and the phase comparison result.

[0011] Furthermore, in the first-end acquisition module, the injected calibration signal Z1 is a square wave signal with a non-harmonic frequency.

[0012] According to another aspect of the present disclosure, a phase sequence live calibration device is provided, characterized in that it includes a terminal and a first end device and a second end device connected to the terminal; the terminal adopts the above-mentioned phase sequence live calibration method to perform phase sequence live calibration.

[0013] Furthermore, the first-end device includes a first-end acquisition device for collecting the verification signal Z1, and a first-end processing device for extracting the amplitude F1 and phase X1 of the verification signal Z1; the second-end device includes a second-end acquisition device for collecting the transmission signal transmitted in each metal sheath at the second end, and a second-end processing device for extracting the amplitude F2 and phase X2 of each transmission signal and determining the transmission signal Z2 that meets the preset requirements.

[0014] Furthermore, the terminal is also used to send a generation instruction to the first-end processing device; the first-end device also includes an injection device, which is used to inject a verification signal Z1 into a phase metal sheath selected at the first end; the first-end processing device is also used to generate and send a verification signal Z1 to the injection device in response to receiving the generation instruction.

[0015] According to another aspect of the present disclosure, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores one or more programs, and the one or more programs include instructions, which, when executed by a computing device, enable the computing device to execute the above-mentioned phase sequence live calibration method.

[0016] The beneficial effects achieved by the present invention are as follows: the present invention selects a phase metal sheath at one end of the cable metal sheath cross-interconnected grounding system, injects a calibration signal into the selected metal sheath, obtains a transmission signal transmitted in the metal sheath at the other end, and determines the second-end metal sheath corresponding to the selected one by comparing the amplitude and phase of the signals at both ends, thereby realizing phase sequence live calibration. Compared with the traditional method, there is no need for manual direct contact with the cable sheath or the grounding system for signal measurement, so the method has high safety, no need for power outage inspection section by section, no need to open the grounding box, and high efficiency. In addition, the calibration signal is different from the on-site industrial frequency signal, and is not prone to misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a flow chart of the phase sequence live calibration method; Figure 2 It is a block diagram of the phase sequence live calibration method; Figure 3 This is a schematic diagram of the installation structure of the phase sequence live calibration device; Figure 4 It is a detailed structural schematic diagram of the phase sequence live calibration device; Figure 5 This is a flow chart of preprocessing in the end processing device. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0019] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0020] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0021] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0023] It should be noted that similar symbols and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

[0024] At the same time, in the description of the embodiments of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features.

[0025] In order to solve the shortcomings of traditional phase sequence verification methods, the present invention proposes a phase sequence live verification method, specifically, a metal sheath of one phase is selected at one end of the cable metal sheath cross-interconnected grounding system, and a verification signal is injected into the selected metal sheath, and a transmission signal transmitted in the metal sheath is obtained at the other end. By comparing the amplitude and phase of the signals at both ends, the metal sheath at the second end corresponding to the selected one is determined, thereby realizing the phase sequence live verification.

[0026] The phase sequence live calibration method can be executed by a calibration device, which can be a terminal device or a server. The terminal device can include but is not limited to mobile phones, computers, smart wearable devices, etc., which are not limited by the embodiments of the present application; the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, big data and artificial intelligence platforms, etc., which are not limited by the embodiments of the present application. Optionally, the phase sequence live calibration method can also be collaboratively executed by multiple electronic devices with computing power. For the sake of ease of explanation, the subsequent embodiments are described as being executed by a calibration device.

[0027] See also Figure 1 , Figure 1 1 is a flow chart of a phase sequence live calibration method provided in an embodiment of the present application. The phase sequence live calibration method can be performed by a calibration device. The phase sequence live calibration method can at least include the following steps: Step 1, when a calibration signal Z1 is injected into a selected phase metal sheath at the first end, the amplitude F1 and phase X1 of the calibration signal Z1 are obtained from the first end device; wherein the first end is one end in an adjacent cross-connection box; the first end device is used to collect the calibration signal Z1, and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal.

[0028] It should be noted that the injection of the calibration signal Z1 can be achieved by direct connection or indirect input. Since the cables are often in high-voltage environments, indirect input is preferred here. For example, an excitation coil can be used to achieve non-contact coupled signal injection. Specifically, the excitation coil is placed on a selected metal sheath, an excitation signal is sent to the excitation coil, and the excitation signal output drives the excitation coil, thereby achieving signal injection.

[0029] Similarly, the calibration signal Z1 is collected indirectly here, such as using a measuring sensor based on the principle of electromagnetic induction, similar to the excitation coil, and putting the measuring sensor on a selected metal sheath to realize the collection of the calibration signal Z1.

[0030] It should be noted that, in order to improve the stability of the calibration signal during transmission and improve the clarity and accuracy of the second end extraction, in some embodiments, the injected calibration signal can use a square wave signal with a non-harmonic frequency (not higher than 1kHz), which can be expressed by the formula: V(t)=A·sgn(sin(2π·f·t)); Wherein, V(t) represents the voltage of the non-harmonic frequency square wave signal at time t, A represents the amplitude, which is the maximum voltage value of the non-harmonic frequency square wave signal, sgn is the sign function, when sin(2π·f·t) is greater than 0, sgn(sin(2π·f·t)) is equal to 1, when sin(2π·f·t) is less than 0, sgn(sin(2π·f·t)) is equal to -1, f is the frequency of the non-harmonic frequency square wave signal (in Hz), select a frequency lower than 1 kHz, and t is in seconds.

[0031] The non-harmonic frequency square wave signal can be distinguished from the on-site power frequency signal (50Hz), effectively avoiding power frequency interference. It is not easy to make misjudgments in signal perception and phase analysis. In addition, this frequency selection makes the signal less susceptible to power frequency noise during transmission, thereby improving the clarity and accuracy of signal extraction.

[0032] In the case of V(t) injection, the signal that can be collected on the selected metal sheath can be expressed as: Vnear(t)=H(f)·V(t)+n(t); Where Vnear(t) represents the signal collected on the selected metal sheath at time t, H(f) is the transfer characteristic of the metal sheath, and n(t) represents random noise, such as power frequency noise and environmental interference.

[0033] In the first-end device, in order to obtain the amplitude F1 and phase X1 more accurately, the collected signal can be preprocessed first, such as filtering and noise reduction, and then further used with common extraction methods, such as fast Fourier transform, bandpass filter and phase demodulator combination method, and window function method, to extract the amplitude F1 and phase X1.

[0034] Taking fast Fourier transform as an example, the extracted amplitude F1 and phase X1 can be expressed as: Aeffnear = |H(f)|·A; ϕnear =arg(H(f)); Where Aeffnear represents the extracted amplitude F1, and ϕnear represents the extracted phase.

[0035] Step 2, obtaining the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second-end device; wherein the second end is the other end in the adjacent cross-connection box; the second-end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements.

[0036] It should be noted that, similar to the first end, the signal acquisition at the second end also adopts an indirect acquisition method, that is, the signal injected at the first end forms an induced current, and the signal on each metal sheath is collected, which can be expressed by the formula: Vfar(t)=G(f)·H(f)·V(t)+n(t); Where Vfar(t) represents the signal collected on the metal sheath at the second end, and G(f) represents the attenuation and phase shift characteristics of the transmission path from the first end to the second end.

[0037] Similar to the first-end device, the second-end device also pre-processes the collected signal, such as filtering and noise reduction, and then further uses common extraction methods, such as fast Fourier transform, bandpass filter and phase demodulator combination method, and window function method, to extract amplitude F2 and phase X2.

[0038] Taking fast Fourier transform as an example, the extracted amplitude F2 and phase X2 can be expressed as: Aefffar=∣G(f)·H(f)∣·A; ϕfar =arg(G(f)·H(f)).

[0039] It should be noted that, similar to the first end, the second end is also distributed with a three-phase metal sheath. The difference is that the three phases of the first end are known, while the three phases of the second end are unknown. The phase sequence live verification of the present invention can determine the three phases of the second end. Therefore, the amplitude F2 and phase X2 of the signal in the unknown three-phase metal sheath can be obtained here.

[0040] The preset requirement may be determined according to actual conditions, and may be set to not screen the transmission signal, or to retain the transmission signal with the largest amplitude F2 and / or phase X2.

[0041] If the computing resources of the verification device are sufficient and the computing amount of the second-end device needs to be reduced to ensure the efficiency of the second-end device, the amplitude F2 and phase X2 of the signal in the three-phase metal sheath can be transmitted to the verification device without comparison and screening.

[0042] If the computing resources of the verification equipment are not sufficient, it is necessary to reduce the computing amount of the verification equipment and the transmission amount between the second-end equipment and the verification equipment. The amplitude F2 and phase X2 of the signal in the three-phase metal sheath can be compared and screened on the second-end equipment side. Specifically, the maximum amplitude F2 and the phase corresponding to the maximum amplitude F2 can be transmitted to the verification equipment, the maximum phase X2 and the amplitude corresponding to the maximum phase X2 can be transmitted to the verification equipment, or the maximum amplitude F2 and the maximum phase X2 of the same signal can be transmitted to the verification equipment. In general, if the amplitude of the signal is the largest, the corresponding phase is generally the largest. Of course, individual cases are not excluded. At this time, a single amplitude or phase comparison screening can be used.

[0043] Step 3, compare the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and compare the phase X1 with the phase X2 to obtain a phase comparison result.

[0044] It should be noted that based on the extraction of amplitude and phase, the signal model of the first end and the signal model of the second end can be constructed, and the formula can be expressed as: Model at the first end: Modelsend={A,f, ϕnear, Aeffnear}; Model at the second end: Modelrecv={ A,f, ϕfar , Aefffar}.

[0045] The data in the model can be compared, mainly the amplitude of the signals at both ends and the phase of the signals at both ends. Amplitude comparison and phase comparison can ensure the integrity of signal transmission, verify phase sequence consistency, and improve calibration accuracy. It is particularly suitable for the precise calibration needs of complex cross-connected grounding systems.

[0046] The process of comparing the amplitude F1 with the amplitude F2 to obtain the amplitude comparison result may include: 11) Calculate the ratio of amplitude F2 to amplitude F1, that is, calculate Aefffar / Aeffnear.

[0047] 12) Calculate the difference between the ratio and the theoretical attenuation ratio, that is, calculate Aefffar / Aeffnear-kexpected; where kexpected is the amplitude attenuation ratio calculated based on the metal sheath transmission path theory.

[0048] 13) If the difference is within the first error range, the comparison between the amplitude F1 and the amplitude F2 passes.

[0049] Assume that the difference corresponding to the metal sheath S is δ S , if 0≤δ S≤ϵk, it indicates that the amplitude F1 is matched with the amplitude F2 corresponding to the metal sheath S. [0, ϵk] is the first error range, and ϵk is the upper limit of the first error range, which is generally set to 2 / 3 of the amplitude F1.

[0050] The process of comparing the phase X1 with the phase X2 and obtaining the phase comparison result may include: 21) Calculate the phase difference Δ between phase X2 and phase X1 = ϕfar - ϕnear.

[0051] 22) Calculate the difference between the phase difference Δ and the theoretical phase difference, that is, calculate Δ-Δϕexpected; where Δϕexpected is the theoretical phase difference calculated based on the symmetry of the metal sheath system.

[0052] 23) If the difference is within the second error range, the comparison between phase X1 and phase X2 passes.

[0053] Assume that the phase difference corresponding to the metal sheath S is ϵ S , if -ϵϕ≤ϵ S ≤ϵϕ, it indicates that the phase X1 is compared with the phase X2 corresponding to the metal sheath S. Among them, [-ϵϕ, ϵϕ] is the second error range, and ϵϕ is the upper limit of the second error range, which is generally set to 120°.

[0054] Step 4, according to the amplitude comparison results and the phase comparison results, determine the second-end metal sheath that has the same phase sequence as the selected single-phase metal sheath; specifically, if the amplitude F1 is compared with the amplitude F2 corresponding to the metal sheath S, and the phase X1 is compared with the phase X2 corresponding to the metal sheath S, it is determined that the metal sheath S has the same phase sequence as the selected single-phase metal sheath.

[0055] Assuming that the first end selects the A-phase metal sheath to inject the verification signal, the metal sheaths at the second end include metal sheath 1, metal sheath 2 and metal sheath 3. Assuming that the amplitude comparison corresponding to metal sheath 3 passes and the corresponding phase comparison passes, then metal sheath 3 can be considered to be the A-phase metal sheath.

[0056] It should be noted that if the cable metal sheath cross-interconnected grounding system has a complex connection relationship between multiple metal sheath sections, a segmented verification process can be used to quickly verify different metal sheath sections.

[0057] The above method selects a phase metal sheath at one end of the cable metal sheath cross-interconnected grounding system, injects a calibration signal into the selected metal sheath, obtains the transmission signal transmitted in the metal sheath at the other end, and determines the second-end metal sheath corresponding to the selected one by comparing the amplitude and phase of the signals at both ends, thereby realizing the phase sequence live calibration. Compared with the traditional method, there is no need for manual direct contact with the cable sheath or the grounding system for signal measurement, so it has high safety, no need to shut down the power section by section for inspection, no need to open the grounding box, and high efficiency. In addition, the calibration signal is different from the on-site power frequency signal, and is not prone to misjudgment.

[0058] See also Figure 2 , Figure 2 A phase sequence live calibration system provided in an embodiment of the present application is provided. Figure 2 The embodiment is a virtual system that can be loaded and executed by a computer device, and the computer device can include the above-mentioned verification device, Figure 2 The system may include a first end acquisition module, a second end acquisition module, a comparison module and a phase determination module, which, when used to execute the above-mentioned phase sequence live calibration method, can: The first-end acquisition module is used to obtain the amplitude F1 and phase X1 of the calibration signal Z1 from the first-end device when the calibration signal Z1 is injected into the selected phase metal sheath at the first end; wherein the first end is one end in the adjacent cross-connection box; the first-end device is used to collect the calibration signal Z1 and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal.

[0059] It should be noted that in the first-end acquisition module, the injected calibration signal Z1 is a heterodyne square wave signal with a non-harmonic frequency. The heterodyne square wave signal with a non-harmonic frequency can be distinguished from the on-site power frequency signal (50Hz), effectively avoiding power frequency interference, and is less likely to cause misjudgment in signal perception and phase analysis. In addition, this frequency selection makes the signal less susceptible to power frequency noise during transmission, thereby improving the clarity and accuracy of signal extraction.

[0060] The second-end acquisition module obtains the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second-end device; wherein the second end is the other end in the adjacent cross-connection box; the second-end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements.

[0061] The comparison module is used to compare the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and to compare the phase X1 with the phase X2 to obtain a phase comparison result.

[0062] The phase determination module is used to determine the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath according to the amplitude comparison result and the phase comparison result.

[0063] Similar to the above method, the above system selects a phase metal sheath at one end of the cable metal sheath cross-interconnected grounding system, injects a calibration signal into the selected metal sheath, obtains the transmission signal transmitted in the metal sheath at the other end, and determines the second-end metal sheath corresponding to the selected one by comparing the amplitude and phase of the signals at both ends, thereby realizing phase sequence live calibration. Compared with the traditional method, there is no need for manual direct contact with the cable sheath or the grounding system for signal measurement, so it has high safety, no need to shut down the power section by section, no need to open the grounding box, and high efficiency. In addition, the calibration signal is different from the on-site power frequency signal, and is not prone to misjudgment.

[0064] To adapt the above method and system, see Figure 3 , Figure 3 A phase sequence live calibration device is provided in an embodiment of the present application, comprising a terminal and a first end device and a second end device connected to the terminal; the terminal adopts the above-mentioned phase sequence live calibration method to perform phase sequence live calibration.

[0065] The first-end device at least includes a first-end acquisition device for acquiring the calibration signal Z1 and a first-end processing device for extracting the amplitude F1 and the phase X1 of the calibration signal Z1.

[0066] It should be noted that the first-end acquisition device adopts an indirect acquisition method and can use a measurement sensor based on the principle of electromagnetic induction.

[0067] The first end processing device at least includes an MCU and a matching transceiver unit, see Figure 4 , specifically may include an MCU, a signal processing unit and a communication unit connected to the MCU, a measurement interface connected to the signal processing unit, a signal processing unit, an MCU and a communication unit; wherein the measurement interface is connected to the measurement sensor to receive the collected signal, the signal processing unit is used to pre-process the calibration signal, the MCU is used to extract the amplitude and phase, and the communication unit is used to send the extracted amplitude and phase to the terminal.

[0068] It should be noted that the generation and injection of the check signal can be implemented separately by using another device, but in some embodiments, in order to reduce costs, the check signal generation and injection functions are integrated in the first-end device. Therefore, the first-end device also includes an injection device, which is used to inject the check signal Z1 into the metal sheath of one phase selected at the first end; the first-end processing device is also used to generate and send the check signal Z1 to the injection device in response to receiving the generation instruction.

[0069] It should be noted that the generation instruction can be an instruction triggered by a button, such as installing a trigger button on the first-end processing device. Here, it can be an instruction issued by the terminal through the communication unit, that is, when verification is required, the terminal sends a generation instruction to the first-end processing device, and the first-end processing device generates and sends a verification signal Z1 to the injection device.

[0070] See therefore Figure 4 Structurally, the first-end processing device also includes a signal output module and a signal interface. The signal output module is connected to the MCU to generate a heterodyne square wave signal with a non-harmonic frequency and send it to the injection device through the signal interface, which can be an excitation coil.

[0071] Different from the first-end device, the second-end device only receives and processes signals. Therefore, the second-end device at least includes a second-end acquisition device for collecting the transmission signals transmitted in each metal sheath at the second end, and a second-end processing device for extracting the amplitude F2 and phase X2 of each transmission signal and determining the transmission signal Z2 that meets the preset requirements.

[0072] The second acquisition device also adopts an indirect acquisition method, and can use a measurement sensor based on the principle of electromagnetic induction. The second-end processing device includes at least an MCU and a matching transceiver unit, which can specifically include an MCU, a signal processing unit and a communication unit connected to the MCU, a measurement interface connected to the signal processing unit, a signal processing unit, an MCU and a communication unit; wherein the measurement interface is connected to the measurement sensor to receive the collected signal, the signal processing unit is used to pre-process the calibration signal, the MCU is used to extract the amplitude and phase, and a multi-component signal decomposition algorithm is used to determine the transmission signal that meets the preset requirements, and the communication unit is used to send the extracted amplitude and phase to the terminal.

[0073] It should be noted that the preprocessing of the signal processing unit is mainly filtering and noise reduction, see Figure 5Specifically, the calibration signal is subjected to low-noise amplification, band-stop filtering, variable gain amplification, band-pass filtering, programmable gain amplification, low-pass filtering and analog-to-digital conversion in sequence; in the figure, LNA is a low-noise amplifier that can amplify weak signals and then output; BEF is a band-stop filter that suppresses the power frequency (50Hz) interference signal and then outputs the signal; VCA is a variable gain amplifier that controls the size of the adjustment gain through the analog voltage output by the DAC (digital-to-analog converter), and the signal is amplified and then output; BPF is a band-pass filter that outputs the signal at a precisely selected frequency point within the passband; PGA is a programmable gain amplifier that controls its gain through a digital signal, and then the signal is amplified and then output; LPF is a low-pass filter that allows frequencies below the specified cutoff frequency to pass through and removes high-frequency components that may cause aliasing during ADC sampling; ADC is an analog-to-digital converter that converts the sampled and conditioned analog signal into a digital format and quantizes the amplitude into a digital value.

[0074] It should be noted that the terminal can be any kind of smart terminal, such as a mobile phone. Assuming that the terminal is close to the first end, the first-end device can directly connect using a WIFI signal, and the second-end device can be connected through a mobile network (such as 4G, 5G, etc.). A report can be quickly generated in the terminal based on the verification results for easy viewing.

[0075] The above-mentioned device realizes phase sequence live calibration, and the coil at the first end and the coil at the second end of the device are asymmetrically distributed, which can further improve the stability and anti-interference ability of signal transmission. In addition, the second-end device adopts a multi-component signal decomposition algorithm and a variety of filtering technologies, which can accurately extract phase information and effective signal amplitude from complex sheath induction signals, thereby improving calibration accuracy.

[0076] The present disclosure also discloses a computer-readable storage medium, characterized in that the computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes the above-mentioned phase sequence live calibration method.

[0077] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0078] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0080] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0081] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A phase sequence live calibration method, characterized in that: include: In the case where the calibration signal Z1 is injected into the selected one-phase metal sheath at the first end, the amplitude F1 and phase X1 of the calibration signal Z1 are obtained from the first end device; wherein the first end is one end in the adjacent cross-connection box; the first end device is used to collect the calibration signal Z1 and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal; Acquire the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second end device; wherein the second end is the other end in the adjacent cross-connection box; the second end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements; Compare the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and compare the phase X1 with the phase X2 to obtain a phase comparison result; According to the amplitude comparison result and the phase comparison result, the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath is determined.

2. The method according to claim 1, characterized in that The injected calibration signal Z1 is a square wave signal with a non-harmonic frequency.

3. The method according to claim 1, characterized in that The preset requirement is not to filter the transmission signal, or to retain the transmission signal with the largest amplitude F2 and / or phase X2.

4. The method according to claim 1, characterized in that Compare the amplitude F1 with the amplitude F2 to obtain amplitude comparison results, including: Calculate the ratio of amplitude F2 to amplitude F1; The difference between the calculated ratio and the theoretical attenuation ratio; If the difference is within the first error range, the comparison between the amplitude F1 and the amplitude F2 passes.

5. The method according to claim 1, characterized in that Compare the phase X1 with the phase X2 to obtain a phase comparison result, including: Calculate the phase difference Δ between the phase X2 and the phase X1; Calculate the difference between the phase difference Δ and the theoretical phase difference; If the difference is within the second error range, the comparison between the phase X1 and the phase X2 is successful.

6. The method according to claim 1, characterized in that According to the amplitude comparison result and the phase comparison result, the second end metal sheath having the same phase sequence as the selected one-phase metal sheath is determined, including: If the amplitude F1 is matched with the amplitude F2 corresponding to the metal sheath S and the phase X1 is matched with the phase X2 corresponding to the metal sheath S, it is determined that the metal sheath S is consistent with the phase sequence of the selected metal sheath of one phase.

7. A phase sequence live calibration system, characterized in that: include: The first-end acquisition module acquires the amplitude F1 and phase X1 of the calibration signal Z1 from the first-end device when the calibration signal Z1 is injected into the selected one-phase metal sheath at the first end; wherein the first end is one end in the adjacent cross-connection box; the first-end device is used to collect the calibration signal Z1 and extract the amplitude F1 and phase X1 of the calibration signal Z1, and the calibration signal Z1 is a signal different from the on-site power frequency signal; The second end acquisition module acquires the amplitude F2 and phase X2 of the transmission signal Z2 that meets the preset requirements from the second end device; wherein the second end is the other end in the adjacent cross-connection box; the second end device is used to collect the transmission signals transmitted in each metal sheath of the second end, extract the amplitude F2 and phase X2 of each transmission signal, and determine the transmission signal Z2 that meets the preset requirements; The comparison module compares the amplitude F1 with the amplitude F2 to obtain an amplitude comparison result, and compares the phase X1 with the phase X2 to obtain a phase comparison result; The phase determination module determines the second-end metal sheath having the same phase sequence as the selected one-phase metal sheath according to the amplitude comparison result and the phase comparison result.

8. The system according to claim 7, characterized in that In the first-end acquisition module, the injected calibration signal Z1 is a square wave signal with a non-harmonic frequency.

9. A phase sequence live calibration device, characterized in that: The invention comprises a terminal and a first end device and a second end device connected to the terminal; the terminal adopts the method described in any one of claims 1 to 6 to perform phase sequence live calibration.

10. The device according to claim 9, characterized in that The first-end device includes a first-end acquisition device for acquiring the verification signal Z1, and a first-end processing device for extracting the amplitude F1 and phase X1 of the verification signal Z1; the second-end device includes a second-end acquisition device for acquiring the transmission signal transmitted in each metal sheath at the second end, and a second-end processing device for extracting the amplitude F2 and phase X2 of each transmission signal and determining the transmission signal Z2 that meets the preset requirements.

11. The device according to claim 10, characterized in that The terminal is also used to send a generation instruction to the first end processing device; The first-end device also includes an injection device, which is used to inject a calibration signal Z1 into a phase metal sheath selected at the first end; the first-end processing device is also used to generate and send the calibration signal Z1 to the injection device in response to receiving a generation instruction.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes any one of the methods of claims 1 to 6.

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