Method and device for positioning laying position of three-phase cable, medium, equipment and product

Abstract

The invention relates to a method and device for positioning the laying position of a three-phase cable, a medium, equipment and a product, and the method comprises the steps: obtaining a first x-axis magnetic field component and a first y-axis magnetic field component which are generated by the three-phase cable and are measured by a first magnetic field sensor under the condition that a specified condition is satisfied, the second x-axis magnetic field component and the second y-axis magnetic field component are measured by a second magnetic field sensor and generated by the three-phase cable; according to at least one of the first phase difference, the second phase difference and the third phase difference, determining an included angle gamma formed between the three-phase cable and the first magnetic field sensor and between the three-phase cable and the second magnetic field sensor; and determining the laying depth of the three-phase cable according to the included angle gamma, the preset spacing and the magnetic field information. According to the technical scheme, a small number of magnetic field sensors can be adopted to position the three-phase cable, the calculation cost is low, and the calculation complexity is low.

Description

Technical Field

[0001] The present disclosure relates to the field of power detection technology, and in particular, to a method, device, medium, equipment and product for locating a three-phase cable laying position. Background Art

[0002] At present, power cables are widely used in the field of power transmission and distribution. For urban power transmission and distribution networks, most of them are laid within a few meters underground. For offshore wind power transmission cables, most of them are laid within a few meters below the seabed, which are difficult to observe visually. When a cable fails, the fault point must be found quickly. Therefore, timely and accurate detection of information such as cable burial depth, route direction and fault point location is the key to ensuring the normal development of power cable detection and maintenance work. Summary of the invention

[0003] The purpose of the present disclosure is to provide a method, device, medium, equipment and product for locating the laying position of a three-phase cable, which can use a small number of magnetic field sensors to locate the three-phase cable, with low calculation cost and low calculation complexity.

[0004] In order to achieve the above objectives, in a first aspect, the present disclosure provides a method for locating a three-phase cable laying position, the method comprising: Acquire a first x-axis magnetic field component and a first y-axis magnetic field component generated by the three-phase cable measured by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor when a specified condition is met, wherein the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0; Determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor according to at least one of a first phase difference, a second phase difference, and a third phase difference, wherein the first phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the x-axis direction, the second phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the y-axis direction, and the third phase difference is a phase difference between a synthetic magnetic field of the first magnetic field sensor and the second magnetic field sensor; The laying depth of the three-phase cable is determined according to the angle γ, the preset spacing, and the magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; The combined magnetic field amplitude of the first magnetic field sensor and the combined magnetic field amplitude of the second magnetic field sensor.

[0005] In a second aspect, the present disclosure provides a device for locating a three-phase cable laying position, the device comprising: an acquisition module, configured to acquire, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component generated by a three-phase cable measured by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor, wherein the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0; a first determining module, configured to determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor according to at least one of a first phase difference, a second phase difference, and a third phase difference, wherein the first phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in an x-axis direction, the second phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in a y-axis direction, and the third phase difference is a phase difference between a synthetic magnetic field of the first magnetic field sensor and the second magnetic field sensor; The second determination module is used to determine the laying depth of the three-phase cable according to the angle γ, the preset spacing, and the magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; The combined magnetic field amplitude of the first magnetic field sensor and the combined magnetic field amplitude of the second magnetic field sensor.

[0006] In a third aspect, the present disclosure provides a non-temporary computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for locating a three-phase cable laying position provided in the first aspect of the present disclosure.

[0007] In a fourth aspect, the present disclosure provides an electronic device, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of the method for locating the three-phase cable laying position provided in the first aspect of the present disclosure.

[0008] In a fourth aspect, the present disclosure provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method for locating a three-phase cable laying position provided in the first aspect of the present disclosure.

[0009] Through the above technical solution, the first x-axis magnetic field component and the first y-axis magnetic field component generated by the three-phase cable measured by the first magnetic field sensor, and the second x-axis magnetic field component and the second y-axis magnetic field component generated by the three-phase cable measured by the second magnetic field sensor are obtained when the specified conditions are met. According to at least one of the first phase difference, the second phase difference, and the third phase difference, the angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor is determined, and then the laying depth of the three-phase cable is determined according to the angle γ, the preset spacing, and the magnetic field information. In this way, the laying depth of the three-phase cable can be accurately measured by using two magnetic field sensors, and a small number of magnetic field sensors can be used to locate the three-phase cable, with low calculation cost and low calculation complexity.

[0010] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The figure is a flow chart showing a method for locating a three-phase cable laying position according to an exemplary embodiment.

[0012] Figure 2 The figure is a schematic diagram showing a magnetic field generated by a three-phase cable at any point in space according to an exemplary embodiment.

[0013] Figure 3 Schematic diagram showing the relative position relationship between a three-phase cable and a magnetic field sensor.

[0014] Figure 4 The figure is a schematic diagram showing the variation of the amplitude of the magnetic field component in the x-axis direction measured by the magnetic field sensor No. 1 and the magnetic field sensor No. 2 with the phase.

[0015] Figure 5 The figure is a schematic diagram showing the variation of the amplitude of the magnetic field component in the y-axis direction measured by the magnetic field sensor No. 1 and the magnetic field sensor No. 2 with the phase.

[0016] Figure 6The figure is a schematic diagram showing the variation of the instantaneous synthetic magnetic field amplitude measured by magnetic field sensor No. 1 and magnetic field sensor No. 2 with the phase.

[0017] Figure 7 The invention is a block diagram showing a device for locating a three-phase cable laying position according to an exemplary embodiment.

[0018] Figure 8 It is a block diagram of an electronic device according to an exemplary embodiment.

[0019] Fig. 9 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0020] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0021] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0022] At present, the most widely used technical means for power cable detection are based on physical principles such as sound, light, and electromagnetism. Among them, the methods based on acoustic and optical principles have great limitations in detecting cables buried underground or under the seabed. The magnetic detection method based on the electromagnetic induction characteristics of the cable can be used to detect cables buried underground or under the seabed.

[0023] Power cables are generally divided into single-phase cables and three-phase cables. Since the magnetic field distribution of single-phase cables is relatively simple, the direction and depth positioning methods of single-phase cables are also relatively mature. For single-phase cables, they can be approximately regarded as a single infinitely long wire. The magnetic field generated at any point in space is , the direction satisfies the right-hand screw rule. The positioning of single-phase cables is generally based on this magnetic field formula. For example, the horizontal position of a single-phase cable can be located by using the principle that the horizontal magnetic field component is the largest and the vertical magnetic field component is the smallest directly above the cable. The laying depth can be calculated by using the amplitude ratio of the two magnetic field sensors directly above the cable in the vertical direction, using the relationship that the magnetic field strength is inversely proportional to the distance.

[0024] The current phase difference between the three-phase conductors of a three-phase cable is 120°. The magnetic field generated at any point in space is the superposition of the magnetic fields of the three-phase conductors. The magnetic field distribution law is more complex than that of a single-phase conductor, and its positioning is more difficult. In related technologies, five magnetic field sensors are usually used to measure the synthetic magnetic field amplitude of the three-phase cable at five locations in space, and a certain geometric relationship is used to calculate the laying direction and depth of the three-phase cable. A large number of magnetic field sensors are required, the calculation method is complex, and the cost is high.

[0025] Based on this, the present disclosure provides a method, device, medium, equipment and product for locating the laying position of a three-phase cable, so as to reduce the complexity of locating the three-phase cable.

[0026] Figure 1 is a flow chart showing a method for locating a three-phase cable laying position according to an exemplary embodiment. The method can be applied to an electronic device with processing capability, such as Figure 1 As shown, the method may include steps 11 to 13.

[0027] In step 11, a first x-axis magnetic field component and a first y-axis magnetic field component generated by a three-phase cable measured by a first magnetic field sensor and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor are obtained when specified conditions are met.

[0028] The first magnetic field sensor and the second magnetic field sensor are placed in the horizontal direction at a preset interval, and the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0.

[0029] Among them, the magnetic field sensor can measure the instantaneous magnetic field components in the three directions of x-axis, y-axis and z-axis respectively. The three-phase cable will generate an alternating magnetic field when energized, and these magnetic field components can be detected by the magnetic field sensor.

[0030] In one implementation scenario, a technician places the first magnetic field sensor and the second magnetic field sensor at a preset spacing. The present disclosure does not limit the value of the preset spacing, for example, it can be 1m. Both magnetic field sensors can measure the magnetic field components generated by the three-phase cable in real time. Both magnetic field sensors can be connected to electronic devices and send the measured data to the electronic devices. The technician can adjust the direction of the two magnetic field sensors. When the amplitudes of the z-axis magnetic field components measured by the two magnetic field sensors are adjusted to 0, the specified conditions are met. When the specified conditions are met, it can be determined that the laying direction of the three-phase cable is parallel to the z-axis, that is, the laying direction of the three-phase cable is parallel to the z-axis of the measurement coordinate system. Since the three-phase cable may not be laid in a straight line, it can be determined that the laying direction of the three-phase cable of the preset length currently measured is parallel to the z-axis.

[0031] In step 12, an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor is determined according to at least one of the first phase difference, the second phase difference, and the third phase difference.

[0032] Among them, the first phase difference is the phase difference between the magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the x-axis direction, the second phase difference is the phase difference between the magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the y-axis direction, and the third phase difference is the phase difference between the synthetic magnetic fields of the first magnetic field sensor and the second magnetic field sensor.

[0033] The phase difference may also be referred to as a phase angle difference. The first phase difference may be obtained by the electronic device based on the first x-axis magnetic field component and the second x-axis magnetic field component. The second phase difference may be obtained by the electronic device based on the first y-axis magnetic field component and the second y-axis magnetic field component. The synthetic magnetic field measured by the first magnetic field sensor may be obtained based on the first x-axis magnetic field component and the first y-axis magnetic field component. The synthetic magnetic field measured by the second magnetic field sensor may be obtained based on the second x-axis magnetic field component and the second y-axis magnetic field component. The electronic device may obtain the third phase difference based on the synthetic magnetic field measured by the first magnetic field sensor and the synthetic magnetic field measured by the second magnetic field sensor.

[0034] The angle γ is the angle between the first straight line and the second straight line. The first straight line is a straight line formed by the first magnetic field sensor and a point in the three-phase cable, and the second straight line is a straight line formed by the second magnetic field sensor and the point in the three-phase cable.

[0035] In step 13, the laying depth of the three-phase cable is determined according to the angle γ, the preset spacing, and the magnetic field information. The magnetic field information includes at least one of the following (a), (b), and (c): (a) the peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and the peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; (b) a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; (c) The composite magnetic field amplitude of the first magnetic field sensor and the composite magnetic field amplitude of the second magnetic field sensor.

[0036] Among them, the peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction can be obtained based on the first x-axis magnetic field component, the peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction can be obtained based on the first y-axis magnetic field component, the peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction can be obtained based on the second x-axis magnetic field component, the peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction can be obtained based on the second y-axis magnetic field component, the synthetic magnetic field amplitude of the first magnetic field sensor can be obtained based on the synthetic magnetic field measured by the first magnetic field sensor, and the synthetic magnetic field amplitude of the second magnetic field sensor can be obtained based on the synthetic magnetic field measured by the second magnetic field sensor.

[0037] Through the above technical solution, the first x-axis magnetic field component and the first y-axis magnetic field component generated by the three-phase cable measured by the first magnetic field sensor, and the second x-axis magnetic field component and the second y-axis magnetic field component generated by the three-phase cable measured by the second magnetic field sensor are obtained when the specified conditions are met. According to at least one of the first phase difference, the second phase difference, and the third phase difference, the angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor is determined, and then the laying depth of the three-phase cable is determined according to the angle γ, the preset spacing, and the magnetic field information. In this way, the laying depth of the three-phase cable can be accurately measured by using two magnetic field sensors, and a small number of magnetic field sensors can be used to locate the three-phase cable, with low calculation cost and low calculation complexity.

[0038] Figure 2 is a schematic diagram showing a magnetic field generated by a three-phase cable at any point in space according to an exemplary embodiment. Figure 2 As shown in the figure, A, B, and C represented by circles are the three conductors of the three-phase cable. For an infinitely long three-phase cable, the magnetic field generated at any point in space can be expressed by the following formulas (1) and (2): (1) (2) in, R is the radius of the circle formed by the three conductors of the three-phase cable, μ is the magnetic permeability, I is the three-phase cable current amplitude, is the angular frequency, is the angle between any point in space and the cable along the x-axis, r is the distance from a point in space to the center of the three-phase cable, , is the instantaneous magnetic field component in the x-axis direction, is the instantaneous magnetic field component in the y-axis direction, t For time.

[0039] Among them, when the amplitude of the instantaneous magnetic field component in the z-axis direction is 0, the instantaneous synthetic magnetic field amplitude is It can be determined by the following formula (3): (3) It can be seen that the magnetic field generated by the three-phase cable at any point in space has the following characteristics: the instantaneous synthetic magnetic field amplitude does not change with time, the peak value of the magnetic field component in the x-axis direction, the peak value of the magnetic field component in the y-axis direction and the synthetic magnetic field amplitude are equal, that is, , and with r is inversely proportional to the square of is the peak value of the magnetic field component in the x-axis direction, is the peak value of the magnetic field component in the y-axis direction. In addition, the three-phase cable generates a rotating magnetic field with constant amplitude at any point in space.

[0040] Figure 3 : is a schematic diagram showing the relative position relationship between the three-phase cable and the magnetic field sensor. Sensor 1 can be the first magnetic field sensor, and sensor 2 can be the second magnetic field sensor. A coordinate system is constructed based on sensor 1 and sensor 2, with the center of sensor 1 and sensor 2 as the coordinate origin and the straight line formed by sensor 1 and sensor 2 as the coordinate x-axis. The coordinate of sensor 1 is , the coordinates of sensor 2 are , d Indicates the preset spacing, the coordinates of the three-phase cable are ( X , H ). is the distance between the three-phase cable and sensor 1, is the distance between the three-phase cable and sensor 2, then the following formulas (4) and (5) can be obtained: (4) (5) like Figure 2 As shown, is the angle between the straight line formed by sensor 1 and the three-phase cable and the horizontal direction, is the angle between the straight line formed by sensor 2 and the three-phase cable and the horizontal direction, then the magnetic field component in the x-axis direction measured by sensor 1 is It can be expressed as the following formula (6): the magnetic field component in the y-axis direction measured by sensor 1 is It can be expressed as the following formula (7): the synthetic magnetic field measured by sensor 1 is It can be expressed as the following formula (8): (6) (7) (8) The magnetic field component in the x-axis direction measured by sensor 2 It can be expressed as the following formula (9): the magnetic field component in the y-axis direction measured by sensor 2 is It can be expressed as the following formula (10): the synthetic magnetic field measured by sensor 2 is It can be expressed as the following formula (11): (9) (10) (11) j can represent an imaginary number. In addition, according to the general form of mathematical functions, the magnetic field component in the x-axis direction measured by sensor 1 is It can be expressed as , which is equivalent to formula (6), the y-axis magnetic field component measured by sensor 1 is It can be expressed as , which is equivalent to formula (7), the synthetic magnetic field measured by sensor 1 It can be expressed as , this expression is equivalent to formula (8).

[0041] The magnetic field component in the x-axis direction measured by sensor 2 It can be expressed as , which is equivalent to formula (9), the y-axis magnetic field component measured by sensor 2 is It can be expressed as , which is equivalent to formula (10), the synthetic magnetic field measured by sensor 2 Expressed as , this expression is equivalent to formula (11).

[0042] in, is the peak value of the magnetic field component of sensor 1 in the x-axis direction, is the peak value of the magnetic field component of sensor 2 in the x-axis direction, is the angular frequency, t For time, is the phase of the magnetic field component of sensor 1 in the x-axis direction, is the phase of the magnetic field component of sensor 2 in the x-axis direction, is the first phase difference. is the peak value of the magnetic field component of sensor 1 in the y-axis direction, is the peak value of the magnetic field component of sensor 2 in the y-axis direction, is the phase of the magnetic field component of sensor 1 in the y-axis direction, is the phase of the magnetic field component of sensor 2 in the y-axis direction, is the second phase difference.B 1m represents the synthetic magnetic field amplitude of sensor 1, B 2m represents the synthetic magnetic field amplitude of sensor 2, is the phase of the synthetic magnetic field of sensor 1, is the phase of the synthetic magnetic field of sensor 2, is the third phase difference.

[0043] The angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor can be calculated by the phase difference, and the angle γ can be determined by one of the following formulas (12), (13), (14), (15): (12) (13) (14) (15) in, is the first phase difference, is the second phase difference, is the third phase difference.

[0044] According to the law that the magnetic field strength of a three-phase cable at any point in space is inversely proportional to the square of the distance, and the triangular cosine theorem, , then the laying depth of the three-phase cable H can be solved by the following system of equations:

[0045]

[0046] Therefore, the laying depth can be determined by the following formulas (16) and (17): (16) (17) Alternatively, the laying depth is determined by the following formulas (18 and (19): (18) (19) Alternatively, the laying depth is determined by the following formulas (20) and (21): (20) (twenty one) in, XIt represents the horizontal distance between the three-phase cable and the center point, which is the center of the first magnetic field sensor and the second magnetic field sensor. H Indicates the laying depth, d Indicates the preset spacing, B 1x-max is the peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction, B 2x-max is the peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction, B 1y-max is the peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction, B 2y-max is the peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction, represents the mean value of the synthetic magnetic field amplitude of the first magnetic field sensor, Indicates the average value of the synthetic magnetic field amplitude of the second magnetic field sensor. In one embodiment, the three different methods for calculating the laying depth can also be used to obtain two laying depths by any two of the above calculation methods, and the average value of the two laying depths is used as the final laying depth.

[0047] In the present disclosure, the method may further include: when the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0, determining that the laying direction of the three-phase cable is parallel to the z-axis.

[0048] In one embodiment, the first x-axis magnetic field component, the first y-axis magnetic field component, the second x-axis magnetic field component and the second y-axis magnetic field component are all magnetic field components at a preset power frequency after being processed by a narrowband filter. The preset power frequency may be 50 Hz.

[0049] The following is an example of the method provided by the present disclosure. In the following, magnetic field sensor No. 1 is the first magnetic field sensor, and magnetic field sensor No. 2 is the second magnetic field sensor.

[0050] In one embodiment, a three-phase power cable has a current peak value of 500A for the three-phase conductors, a phase difference of 120° between the three conductors, a radius of a circle formed by the centers of the three-phase conductors of 0.1m, two magnetic field sensors are located on a horizontal plane 2.5m above the three-phase cable (i.e., a laying depth H=2.5m), and a horizontal distance of 1m between the No. 1 and No. 2 magnetic field sensors (i.e., d =1m). At this time, the amplitude of the magnetic field component of the z-axis of the two magnetic field sensors is 0, and the laying direction of the three-phase cable is parallel to the z-axis. Taking the center of the No. 1 magnetic field sensor and the No. 2 magnetic field sensor as the coordinate origin, the coordinate of the three-phase cable on the x-axis is 0.3m (ie X=0.3m). At this time, the three-phase cable is on the right side of the center of the No. 1 magnetic field sensor and the No. 2 magnetic field sensor, and on the left side of the No. 1 magnetic field sensor.

[0051] See also Figure 4 , which is a schematic diagram showing the change of the amplitude of the x-axis magnetic field component measured by the No. 1 magnetic field sensor and the No. 2 magnetic field sensor with the phase (0~360°), it can be seen that there is a phase difference between the x-axis magnetic field components measured by the No. 1 magnetic field sensor and the No. 2 magnetic field sensor. It is 47.4°, the peak value of the magnetic field component in the x-axis direction of magnetic field sensor No. 1 is 2302nT, and the peak value of the magnetic field component in the x-axis direction of magnetic field sensor No. 2 is 2178nT.

[0052] See also Figure 5 , which is a schematic diagram showing the variation of the amplitude of the magnetic field component in the y-axis direction measured by magnetic field sensor No. 1 and sensor No. 2 with the phase (0~360°). It can be seen that there is a phase difference of 41.4° between the magnetic field components in the y-axis direction measured by magnetic field sensor No. 1 and sensor No. 2. The peak value of the magnetic field component in the y-axis direction of magnetic field sensor No. 1 is 2466nT, and the peak value of the magnetic field component in the y-axis direction of magnetic field sensor No. 2 is 2175nT.

[0053] See also Figure 6 , which is a schematic diagram showing the variation of the instantaneous synthetic magnetic field amplitude measured by magnetic field sensor No. 1 and magnetic field sensor No. 2 with the phase (0~360°). It can be seen that the synthetic magnetic field amplitude varies slightly with the phase. The average synthetic magnetic field of magnetic field sensor No. 1 is 2386nT, and the average synthetic magnetic field of magnetic field sensor No. 2 is 2178nT.

[0054] Since the magnetic field theory formula used in this disclosure is Under certain circumstances, it is obtained through certain simplification. In order to more accurately calculate the laying depth of the three-phase cable, the following measures can be adopted: the phase difference between the No. 1 magnetic field sensor and the No. 2 magnetic field sensor can be taken as the average phase difference in the x-direction and the y-direction; the magnetic field of the No. 1 magnetic field sensor and the No. 2 magnetic field sensor takes the average value of the synthetic magnetic field in one cycle. Based on the above data, the laying depth of the three-phase cable can be calculated to be 2.513m, which is very close to the actual laying depth of 2.5m.

[0055] It should be noted that after the electronic device obtains the first x-axis magnetic field component, the first y-axis magnetic field component, the second x-axis magnetic field component, and the second y-axis magnetic field component, the electronic device can display the magnetic field components and the synthetic magnetic field as follows: Figures 4 to 6In the form of the function shown, the electronic device can directly obtain the first phase difference, the second phase difference, the third phase difference, the peak value of each magnetic field component and the amplitude of the synthetic magnetic field, and calculate the laying depth based on these data. It is worth noting that the above description of the peak value of the magnetic field component in the x-axis direction, the peak value of the magnetic field component in the y-axis direction and the amplitude of the synthetic magnetic field being equal means that the three are considered to be approximately equal, and any of the three can be used to calculate the laying depth.

[0056] In another embodiment, a three-phase power cable has a current peak value of 500A in the three-phase conductors, the three conductors have a phase difference of 120°, the radius of the circle formed by the centers of the three-phase conductors is 0.1m, and the magnetic field sensor is located on a horizontal plane 2.5m above the three-phase cable (i.e., the laying depth is H =2.5m), the horizontal distance between magnetic field sensors No. 1 and No. 2 is 1m (i.e. d =1m). At this time, the amplitude of the magnetic field component of the z-axis of the two magnetic field sensors is 0, and the laying direction of the three-phase cable is parallel to the z-axis. Taking the center of the No. 1 magnetic field sensor and the No. 2 magnetic field sensor as the coordinate origin, the coordinate of the three-phase cable on the x-axis is 0m (that is, X=0m). At this time, the three-phase cable is directly below the center of the No. 1 magnetic field sensor and the No. 2 magnetic field sensor. The phase difference of the magnetic field component in the x-axis direction measured by the No. 1 magnetic field sensor and the No. 2 magnetic field sensor is 48.94°, and the phase difference of the magnetic field component in the y-axis direction measured by the No. 1 magnetic field sensor and the No. 2 magnetic field sensor is 41.65°, so the average phase difference is 45.29°. The average value of the synthetic magnetic field of the No. 1 magnetic field sensor is 2309.2nT, and the average value of the synthetic magnetic field of the No. 2 magnetic field sensor is 2308.7nT. Based on the above data, it can be calculated that the laying depth of the three-phase cable is 2.497 m, which is very close to the actual laying depth of 2.5m.

[0057] In another embodiment, a three-phase power cable has a current peak value of 500A in the three-phase conductors, the phase difference between the three conductors is 120°, the radius of the circle formed by the centers of the three-phase conductors is 0.1m, the magnetic field sensor is located on a horizontal plane 2.5m above the three-phase cable (i.e., the laying depth H=2.5m), and the horizontal distance between the No. 1 and No. 2 magnetic field sensors is 1m (i.e., d=1m). At this time, the amplitude of the magnetic field component of the z-axis of the two magnetic field sensors is 0, and the laying direction of the three-phase cable is parallel to the z-axis. Taking the center of magnetic field sensor No. 1 and magnetic field sensor No. 2 as the coordinate origin, the coordinate of the three-phase cable in the x-direction is 1m (that is, X=1m). At this time, the three-phase cable is on the right side of magnetic field sensor No. 1 and magnetic field sensor No. 2. The phase difference of the magnetic field component in the x-axis direction measured by magnetic field sensor No. 1 and magnetic field sensor No. 2 is 38.17°, and the phase difference of the magnetic field component in the y-axis direction measured by magnetic field sensor No. 1 and magnetic field sensor No. 2 is 40.44°, so the average phase difference is 39.31°. The average value of the synthetic magnetic field of magnetic field sensor No. 1 is 2308.7nT, and the average value of the synthetic magnetic field of magnetic field sensor No. 2 is 1765.4nT. Based on the above data, it can be calculated that the laying depth of the three-phase cable is 2.501m, which is very close to the actual laying depth of 2.5m.

[0058] Based on the same inventive concept, the present disclosure also provides a device for locating a three-phase cable laying position. Figure 7 is a block diagram of a device for locating a three-phase cable laying position according to an exemplary embodiment. Figure 7 As shown, the device 70 may include: An acquisition module 71 is used to acquire, when a specified condition is met, a first x-axis magnetic field component and a first y-axis magnetic field component generated by the three-phase cable measured by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor, wherein the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0; A first determination module 72 is used to determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor according to at least one of a first phase difference, a second phase difference, and a third phase difference, wherein the first phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the x-axis direction, the second phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the y-axis direction, and the third phase difference is a phase difference between a synthetic magnetic field of the first magnetic field sensor and the second magnetic field sensor; The second determination module 73 is used to determine the laying depth of the three-phase cable according to the angle γ, the preset spacing, and the magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; The combined magnetic field amplitude of the first magnetic field sensor and the combined magnetic field amplitude of the second magnetic field sensor.

[0059] Optionally, the first determining module 72 is configured to determine the angle γ by one of the following formulas:

[0060]

[0061]

[0062]

[0063] in, is the first phase difference, is the second phase difference, is the third phase difference.

[0064] Optionally, the second determining module 73 is used to determine the laying depth by the following formula:

[0065]

[0066] Alternatively, the laying depth is determined by the following formula:

[0067]

[0068] Alternatively, the laying depth is determined by the following formula:

[0069]

[0070] in, X represents the distance between the three-phase cable and the center point in the horizontal direction, the center point being the center of the first magnetic field sensor and the second magnetic field sensor, H represents the laying depth, d represents the preset spacing, is the peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction, is the peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction, is the peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction, is the peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction, represents the average value of the synthetic magnetic field amplitude of the first magnetic field sensor, represents the average value of the synthetic magnetic field amplitude of the second magnetic field sensor.

[0071] Optionally, the device 70 further includes: The third determination module is used to determine that the laying direction of the three-phase cable is parallel to the z-axis when the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0.

[0072] Optionally, the first x-axis magnetic field component, the first y-axis magnetic field component, the second x-axis magnetic field component and the second y-axis magnetic field component are all magnetic field components at a preset power frequency after being processed by a narrowband filter.

[0073] Optionally, the first magnetic field sensor and the second magnetic field sensor are placed at a preset interval in the horizontal direction.

[0074] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0075] Figure 8 FIG. 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. Figure 8 As shown, the electronic device 700 may include: a processor 701 , a memory 702 . The electronic device 700 may also include one or more of a multimedia component 703 , an input / output (I / O) interface 704 , and a communication component 705 .

[0076] The processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the method for locating the three-phase cable laying position. The memory 702 is used to store various types of data to support the operation of the electronic device 700. For example, these data may include instructions for any application or method used to operate on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, which is used to receive external audio signals. The received audio signal may be further stored in the memory 702 or sent through the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the above-mentioned other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0077] In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned method for locating the laying position of the three-phase cable.

[0078] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the method for locating the three-phase cable laying position described above are implemented. For example, the computer-readable storage medium may be the memory 702 including the program instructions described above, and the program instructions may be executed by the processor 701 of the electronic device 700 to complete the method for locating the three-phase cable laying position described above.

[0079] Fig. 9 1 is a block diagram of an electronic device 1900 according to an exemplary embodiment. For example, the electronic device 1900 may be provided as a server. Fig. 9 The electronic device 1900 includes a processor 1922, which may be one or more, and a memory 1932 for storing a computer program executable by the processor 1922. The computer program stored in the memory 1932 may include one or more modules each corresponding to a set of instructions. In addition, the processor 1922 may be configured to execute the computer program to perform the above-mentioned method for locating the three-phase cable laying position.

[0080] In addition, the electronic device 1900 may further include a power supply component 1926 and a communication component 1950, wherein the power supply component 1926 may be configured to perform power management of the electronic device 1900, and the communication component 1950 may be configured to implement communication of the electronic device 1900, for example, wired or wireless communication. In addition, the electronic device 1900 may further include an input / output (I / O) interface 1958. The electronic device 1900 may operate based on an operating system stored in the memory 1932.

[0081] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned method for locating the three-phase cable laying position are implemented. For example, the non-transitory computer-readable storage medium can be the above-mentioned memory 1932 including program instructions, and the above-mentioned program instructions can be executed by the processor 1922 of the electronic device 1900 to complete the above-mentioned method for locating the three-phase cable laying position.

[0082] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned method for locating a three-phase cable laying position when executed by the programmable device.

[0083] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0085] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for locating a three-phase cable laying position, characterized in that: The method comprises: Acquire a first x-axis magnetic field component and a first y-axis magnetic field component generated by the three-phase cable measured by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor when a specified condition is met, wherein the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0; Determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor according to at least one of a first phase difference, a second phase difference, and a third phase difference, wherein the first phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the x-axis direction, the second phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in the y-axis direction, and the third phase difference is a phase difference between a synthetic magnetic field of the first magnetic field sensor and the second magnetic field sensor; The laying depth of the three-phase cable is determined according to the angle γ, the preset spacing, and the magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; The combined magnetic field amplitude of the first magnetic field sensor and the combined magnetic field amplitude of the second magnetic field sensor.

2. The method according to claim 1, characterized in that The angle γ is determined by one of the following formulas: in, is the first phase difference, is the second phase difference, is the third phase difference.

3. The method according to claim 1, characterized in that The laying depth is determined by the following formula: Alternatively, the laying depth is determined by the following formula: Alternatively, the laying depth is determined by the following formula: in, X represents the distance between the three-phase cable and the center point in the horizontal direction, the center point being the center of the first magnetic field sensor and the second magnetic field sensor, H represents the laying depth, d represents the preset spacing, is the peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction, is the peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction, is the peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction, is the peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction, represents the average value of the synthetic magnetic field amplitude of the first magnetic field sensor, represents the average value of the synthetic magnetic field amplitude of the second magnetic field sensor.

4. The method according to claim 1, characterized in that: The method further comprises: When the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0, it is determined that the laying direction of the three-phase cable is parallel to the z-axis.

5. The method according to claim 1, characterized in that The first x-axis magnetic field component, the first y-axis magnetic field component, the second x-axis magnetic field component, and the second y-axis magnetic field component are all magnetic field components at a preset power frequency after being processed by a narrowband filter.

6. The method according to claim 1, characterized in that The first magnetic field sensor and the second magnetic field sensor are placed in a horizontal direction at a preset interval.

7. A device for locating the laying position of a three-phase cable, characterized in that: The device comprises: an acquisition module, configured to acquire, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component generated by a three-phase cable measured by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component generated by the three-phase cable measured by a second magnetic field sensor, wherein the specified condition is that the amplitude of the z-axis magnetic field component measured by the first magnetic field sensor is 0 and the amplitude of the z-axis magnetic field component measured by the second magnetic field sensor is 0; a first determining module, configured to determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor according to at least one of a first phase difference, a second phase difference, and a third phase difference, wherein the first phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in an x-axis direction, the second phase difference is a phase difference between magnetic field components of the first magnetic field sensor and the second magnetic field sensor in a y-axis direction, and the third phase difference is a phase difference between a synthetic magnetic field of the first magnetic field sensor and the second magnetic field sensor; The second determination module is used to determine the laying depth of the three-phase cable according to the angle γ, the preset spacing, and the magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the x-axis direction; a peak value of the magnetic field component of the first magnetic field sensor in the y-axis direction and a peak value of the magnetic field component of the second magnetic field sensor in the y-axis direction; The combined magnetic field amplitude of the first magnetic field sensor and the combined magnetic field amplitude of the second magnetic field sensor.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

9. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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