Method, apparatus, medium, device, and product for positioning a three-phase cable laying location

Abstract

The present disclosure relates to a method, device, medium, equipment and product for positioning a three-phase cable laying position, the method comprising: obtaining, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component of a first magnetic field sensor measured from a three-phase cable, and a second x-axis magnetic field component and a second y-axis magnetic field component of a second magnetic field sensor measured from the three-phase cable; determining an included angle γ 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; and determining a laying depth of the three-phase cable according to the included angle γ, a preset interval and magnetic field information. Through the above technical solution, the three-phase cable can be positioned by using a small number of magnetic field sensors, and the calculation cost is low and the calculation complexity is low.

Description

TECHNICAL FIELD

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

[0002] At present, power cables are widely used in power transmission and distribution fields. For urban power transmission and distribution network power cables, they are mostly laid within a range of several meters underground. For offshore wind power transmission cables, they are mostly laid within a range of several meters below the seabed. It is difficult to observe them visually. When a cable fails, it is necessary to quickly find the fault point. Therefore, timely and accurate detection of the cable burial depth, route direction and fault point position and other information is the key to ensuring the normal development of power cable detection and maintenance work. SUMMARY

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

[0004] To achieve the above-mentioned purpose, in a first aspect, the present disclosure provides a method for positioning a three-phase cable laying position, the method comprising:

[0005] obtaining, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component of a three-phase cable generated by a first magnetic field sensor, and a second x-axis magnetic field component and a second y-axis magnetic field component of the three-phase cable generated 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;

[0006] determining an included 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 the magnetic field components in the x-axis direction of the first magnetic field sensor and the second magnetic field sensor, the second phase difference is a phase difference between the magnetic field components in the y-axis direction of the first magnetic field sensor and the second magnetic field sensor, and the third phase difference is a phase difference between the resultant magnetic fields of the first magnetic field sensor and the second magnetic field sensor;

[0007] determining a laying depth of the three-phase cable according to the included angle γ, the preset interval and magnetic field information, wherein the magnetic field information comprises at least one of:

[0008] a peak value of the magnetic field component in the x-axis direction of the first magnetic field sensor and a peak value of the magnetic field component in the x-axis direction of the second magnetic field sensor;

[0009] a peak value of a magnetic field component in the y-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the y-axis direction of the second magnetic field sensor;

[0010] a peak value of a magnetic field component in the x-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the x-axis direction of the second magnetic field sensor;

[0011] In a second aspect, the present disclosure provides a device for positioning a laying position of a three-phase cable, the device comprising:

[0012] an acquisition module configured to acquire, in a case where a specified condition is met, a first x-axis magnetic field component and a first y-axis magnetic field component of a first magnetic field 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 of the first magnetic field generated by the three-phase cable measured by a second magnetic field sensor, wherein the specified condition is that an amplitude of a z-axis magnetic field component measured by the first magnetic field sensor is 0 and an amplitude of a z-axis magnetic field component measured by the second magnetic field sensor is 0;

[0013] a first determination module configured to determine, according to at least one of a first phase difference, a second phase difference and a third phase difference, an included angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor, wherein the first phase difference is a phase difference between magnetic field components in the x-axis direction of the first magnetic field sensor and the second magnetic field sensor, the second phase difference is a phase difference between magnetic field components in the y-axis direction of the first magnetic field sensor and the second magnetic field sensor, and the third phase difference is a phase difference between composite magnetic fields of the first magnetic field sensor and the second magnetic field sensor;

[0014] a second determination module configured to determine, according to the included angle γ, the preset interval and magnetic field information, a laying depth of the three-phase cable, wherein the magnetic field information comprises at least one of:

[0015] a peak value of a magnetic field component in the x-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the x-axis direction of the second magnetic field sensor;

[0016] a peak value of a magnetic field component in the y-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the y-axis direction of the second magnetic field sensor;

[0017] a peak value of a magnetic field component in the x-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the x-axis direction of the second magnetic field sensor;

[0018] In a third aspect, the present disclosure provides a non-transitory computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the method for positioning a laying position of a three-phase cable according to the first aspect of the present disclosure.

[0019] In a fourth aspect, the present disclosure provides an electronic device, comprising:

[0020] a memory having stored thereon a computer program;

[0021] a processor configured to execute the computer program in the memory to implement the steps of the method for positioning a three-phase cable laying position according to the first aspect of the present disclosure.

[0022] 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 positioning a three-phase cable laying position according to the first aspect of the present disclosure.

[0023] According to 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 under the condition of meeting the specified condition. At least one of the first phase difference, the second phase difference, and the third phase difference is used to determine the included angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor. Then, the laying depth of the three-phase cable is determined according to the included angle γ, the preset interval, 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 the three-phase cable can be positioned by using a smaller number of magnetic field sensors, thereby reducing the calculation cost and the calculation complexity.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 FIG. 1 is a flowchart of a method for positioning a three-phase cable laying position according to an exemplary embodiment.

[0027] Figure 2 FIG. 2 is a schematic diagram of a magnetic field generated by a three-phase cable at an arbitrary point in space according to an exemplary embodiment.

[0028] Figure 3 FIG. 3 is a schematic diagram of the relative position relationship between a three-phase cable and a magnetic field sensor according to an exemplary embodiment.

[0029] Figure 4 FIG. 4 is a schematic diagram of the x-axis direction magnetic field component amplitude measured by the No. 1 magnetic field sensor and the No. 2 sensor changing with the phase according to an exemplary embodiment.

[0030] Figure 5 A diagram showing the amplitude of the y-axis component of the magnetic field measured by the 1st magnetic field sensor and the 2nd sensor as a function of phase, shown by way of example.

[0031] Figure 6 A diagram showing the amplitude of the instantaneous resultant magnetic field measured by the 1st magnetic field sensor and the 2nd magnetic field sensor as a function of phase, shown by way of example.

[0032] Figure 7 A block diagram of an apparatus for locating a three-phase cable laying position, according to an example embodiment.

[0033] Figure 8 A block diagram of an electronic device, according to an example embodiment.

[0034] Figure 9 A block diagram of an electronic device, according to an example embodiment. DETAILED DESCRIPTION

[0035] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0036] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection regulations and policies of the country where the device is located, and with the authorization given by the owner of the corresponding device.

[0037] At present, the most widely used technology for power cable detection is based on the principles of acoustics, optics, electromagnetism, etc. Among them, the methods based on the principles of acoustics and optics have great limitations for detecting cables buried underground or under the seabed. The magnetic detection method based on the electromagnetic induction characteristics of the cable can be applied to detect cables buried underground or under the seabed.

[0038] 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 methods for positioning the direction and depth of single-phase cables are also relatively mature. For a single-phase cable, it can be approximately regarded as a single infinite long wire, and the magnetic field generated by it at any point in space is , and 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 component of the magnetic field above the single-phase cable is maximum and the vertical component of the magnetic field is minimum. The laying depth can be calculated by the amplitude ratio of the two magnetic field sensors in the vertical direction above the cable, based on the relationship that the magnetic field strength is inversely proportional to the distance.

[0039] The phase difference between the three-phase conductors of the three-phase cable is 120°, and the magnetic field generated at any point in space is the superposition of the magnetic fields of the three-phase conductors, and the magnetic field distribution is more complex than that of a single-phase conductor, and the positioning is more difficult. In the related art, five magnetic field sensors are usually used to measure the synthesized magnetic field amplitudes of the three-phase cable at five positions in space, and the laying direction and depth of the three-phase cable are calculated by using certain geometric relationships, which requires a large number of magnetic field sensors, a complex calculation method, and a high cost.

[0040] Based on this, the present disclosure provides a method, device, medium, equipment and product for positioning the laying position of a three-phase cable to reduce the positioning complexity of the three-phase cable.

[0041] Figure 1 A flowchart of a method for positioning the laying position of a three-phase cable according to an exemplary embodiment is shown, which can be applied to an electronic device with processing capability, such as Figure 1 As shown, the method can include steps 11 to 13.

[0042] In step 11, 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 under the condition that a specified condition is met.

[0043] Wherein, the first magnetic field sensor and the second magnetic field sensor are placed at a preset interval in the horizontal direction, 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.

[0044] Wherein, the magnetic field sensor can measure the instantaneous magnetic field components in the x-axis, y-axis and z-axis directions respectively, and 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.

[0045] In an implementation scenario, the first magnetic field sensor and the second magnetic field sensor are placed by a technician at a preset interval, and the present disclosure does not limit the value of the preset interval, which can be, for example, 1 m. 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 the electronic device and send the measured data to the electronic device, and the technician can adjust the direction of the two magnetic field sensors, and when the amplitude of the z-axis magnetic field component measured by both magnetic field sensors is 0, the specified condition is met. Under the condition that the specified condition is met, it can be determined that the laying direction of the three-phase cable is parallel to the z-axis, i.e., 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 current measured preset length is parallel to the z-axis.

[0046] In step 12, an included 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.

[0047] The first phase difference is a 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 a 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 a phase difference of the resultant magnetic field of the first magnetic field sensor and the second magnetic field sensor.

[0048] The phase difference can also be referred to as a phase angle difference. The first phase difference can be obtained by the electronic device according to the first x-axis magnetic field component and the second x-axis magnetic field component, and the second phase difference can be obtained by the electronic device according to the first y-axis magnetic field component and the second y-axis magnetic field component. According to the first x-axis magnetic field component and the first y-axis magnetic field component, the resultant magnetic field measured by the first magnetic field sensor can be obtained, and according to the second x-axis magnetic field component and the second y-axis magnetic field component, the resultant magnetic field measured by the second magnetic field sensor can be obtained. The electronic device can obtain the third phase difference according to the resultant magnetic field measured by the first magnetic field sensor and the resultant magnetic field measured by the second magnetic field sensor.

[0049] The included angle γ is an included angle between a first straight line and a 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.

[0050] In step 13, a laying depth of the three-phase cable is determined according to the included angle γ, a preset interval, and magnetic field information. The magnetic field information includes at least one of (a), (b), and (c) below:

[0051] (a) 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;

[0052] (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;

[0053] (c) a resultant magnetic field amplitude of the first magnetic field sensor and a resultant magnetic field amplitude of the second magnetic field sensor.

[0054] The peak value of the magnetic field component of the first magnetic field sensor in the x-axis direction can be obtained according to 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 according to 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 according to 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 according to the second y-axis magnetic field component, the combined magnetic field amplitude of the first magnetic field sensor can be obtained according to the combined magnetic field measured by the first magnetic field sensor, and the combined magnetic field amplitude of the second magnetic field sensor can be obtained according to the combined magnetic field measured by the second magnetic field sensor.

[0055] According to the 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 under the condition of meeting the specified condition, at least one of the first phase difference, the second phase difference, and the third phase difference is determined to determine the included angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor, and then the laying depth of the three-phase cable is determined according to the included angle γ, the preset interval, 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, the three-phase cable can be positioned by using a small number of magnetic field sensors, the calculation cost is low, and the calculation complexity is low.

[0056] Figure 2 is a schematic diagram of a magnetic field generated by a three-phase cable at an arbitrary point in space according to an example embodiment, as shown in Figure 2 A, B, and C represented by circles are three conductors of the three-phase cable. For an infinitely long three-phase cable, the magnetic field generated at an arbitrary point in space can be represented by the following formulas (1) and (2):

[0057] (1)

[0058] (2)

[0059] wherein, 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 current amplitude of the three-phase cable, is the angular frequency, is the included angle formed by the cable along the x-axis direction, r is the distance of the point in space from 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, tFor time.

[0060] Wherein, in the case of the amplitude of the instantaneous magnetic field component in the z-axis direction is 0, the instantaneous synthetic magnetic field amplitude Can be determined by the following formula (3):

[0061] (3)

[0062] 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 is inversely proportional to the square of r , 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. And the three-phase cable generates a rotating magnetic field with constant amplitude at any point in space.

[0063] Figure 3 is a schematic diagram of the relative position relationship between the three-phase cable and the magnetic field sensor. Sensor 1 can be a first magnetic field sensor, and sensor 2 can be a second magnetic field sensor. A coordinate system is constructed according to 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 x-axis, then the coordinates of sensor 1 are , and the coordinates of sensor 2 are , d represents a preset distance, and 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:

[0064] (4)

[0065] (5)

[0066] As shown in Figure 2 , the angle between the straight line formed by sensor 1 and the three-phase cable and the horizontal direction is , and the angle between the straight line formed by sensor 2 and the three-phase cable and the horizontal direction is , then the magnetic field component in the x-axis direction measured by sensor 1 can be represented by the following formula (6), and the magnetic field component in the y-axis direction measured by sensor 1 can be represented by the following formula (7), and the synthetic magnetic field measured by sensor 1 may be expressed as the following equation (8):

[0067] (6)

[0068] (7)

[0069] (8)

[0070] The x-axis component of the magnetic field measured by sensor 2 may be expressed as the following equation (9), the y-axis component of the magnetic field measured by sensor 2 may be expressed as the following equation (10), the resultant magnetic field measured by sensor 2 may be expressed as the following equation (11):

[0071] (9)

[0072] (10)

[0073] (11)

[0074] jmay represent an imaginary number. Also, in accordance with the general form of a mathematical function, the x-axis component of the magnetic field measured by sensor 1 may be expressed as which is equivalent to equation (6), the y-axis component of the magnetic field measured by sensor 1 may be expressed as which is equivalent to equation (7), the resultant magnetic field measured by sensor 1 may be expressed as which is equivalent to equation (8).

[0075] The x-axis component of the magnetic field measured by sensor 2 may be expressed as which is equivalent to equation (9), the y-axis component of the magnetic field measured by sensor 2 may be expressed as which is equivalent to equation (10), the resultant magnetic field measured by sensor 2 may be expressed as which is equivalent to equation (11).

[0076] wherein is the peak value of the x-axis component of the magnetic field measured by sensor 1, is the peak value of the x-axis component of the magnetic field measured by sensor 2, is the angular frequency, t is time, the phase of the magnetic field component of sensor 1 in the x-axis direction, the phase of the magnetic field component of sensor 2 in the x-axis direction, the first phase difference. the peak value of the magnetic field component of sensor 1 in the y-axis direction, the peak value of the magnetic field component of sensor 2 in the y-axis direction, the phase of the magnetic field component of sensor 1 in the y-axis direction, the phase of the magnetic field component of sensor 2 in the y-axis direction, the second phase difference. B 1m the amplitude of the resultant magnetic field of sensor 1, B 2m the amplitude of the resultant magnetic field of sensor 2, the phase of the resultant magnetic field of sensor 1, the phase of the resultant magnetic field of sensor 2, the third phase difference.

[0077] wherein the included 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 included angle γ can be determined by one of the following formulas (12), (13), (14), and (15):

[0078] (12)

[0079] (13)

[0080] (14)

[0081] (15)

[0082] wherein, the first phase difference, the second phase difference, the third phase difference.

[0083] According to the rule that the magnetic field intensity of the three-phase cable at any point in space is inversely proportional to the square of the distance, the cosine law of a triangle, and the laying depth of the three-phase cable H can be solved by the following equation set:

[0084]

[0085]

[0086] Therefore, the laying depth can be determined by the following formulas (16) and (17):

[0087] (16)

[0088] (17)

[0089] Alternatively, the laying depth is determined by the following equations (18) and (19):

[0090] (18)

[0091] (19)

[0092] Alternatively, the laying depth is determined by the following equations (20) and (21):

[0093] (20)

[0094] (21)

[0095] wherein, 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 interval, B 1x-max is the peak value of the magnetic field component in the x-axis direction of the first magnetic field sensor, B 2x-max is the peak value of the magnetic field component in the x-axis direction of the second magnetic field sensor, B 1y-max is the peak value of the magnetic field component in the y-axis direction of the first magnetic field sensor, B 2y-max is the peak value of the magnetic field component in the y-axis direction of the second magnetic field sensor, represents the average of the combined magnetic field amplitude of the first magnetic field sensor, represents the average of the combined magnetic field amplitude of the second magnetic field sensor. In an embodiment, the laying depth is calculated in the above three different ways, or two laying depths are obtained by any two of the above calculation methods, and the average of the two laying depths is taken as the final laying depth.

[0096] In the present disclosure, the method can further comprise: determining 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.

[0097] 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.

[0098] The following describes an embodiment of the method provided by the present disclosure. Magnetic field sensor No. 1 is referred to as the first magnetic field sensor, and magnetic field sensor No. 2 is referred to as the second magnetic field sensor.

[0099] In one embodiment, a three-phase power cable has a current peak of 500A in the three-phase conductors, a phase difference of 120° between the three conductors, a radius of 0.1m for the circle formed by the centers of the three-phase conductors, and two magnetic field sensors are located 2.5m above the three-phase cable (i.e., a laying depth H = 2.5m). The horizontal distance between magnetic field sensors No. 1 and No. 2 is 1m (i.e., d =1m). At this point, the z-axis magnetic field component amplitudes of both magnetic field sensors are zero, and the three-phase cable is laid parallel to the z-axis. With the center of magnetic field sensor No. 1 and magnetic field sensor No. 2 as the coordinate origin, the x-axis coordinate of the three-phase cable is 0.3m (i.e., X = 0.3m). At this point, the three-phase cable is to the right of the center of magnetic field sensor No. 1 and magnetic field sensor No. 2, and to the left of magnetic field sensor No. 1.

[0100] 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. The angle of the magnetic field is 47.4°, the peak value of the magnetic field component in the x-axis direction of the magnetic field sensor No. 1 is 2302nT, and the peak value of the magnetic field component in the x-axis direction of the magnetic field sensor No. 2 is 2178nT.

[0101] See also Figure 5 , which is a schematic diagram illustrating the variation of the amplitude of the y-axis magnetic field component measured by magnetic field sensor No. 1 and sensor No. 2 with phase (0-360°). It can be seen that there is a phase difference of 41.4° between the y-axis magnetic field components measured by magnetic field sensor No. 1 and sensor No. 2. The peak value of the y-axis magnetic field component of magnetic field sensor No. 1 is 2466 nT, and the peak value of the y-axis magnetic field component of magnetic field sensor No. 2 is 2175 nT.

[0102] See also Figure 6 , 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 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.

[0103] Since the magnetic field theory formula adopted in this disclosure is To more accurately calculate the three-phase cable installation depth, the following measures can be used: the phase difference between magnetic field sensor No. 1 and magnetic field sensor No. 2 can be taken as the average phase difference in the x- and y-directions; and the average value of the combined magnetic field from magnetic field sensor No. 1 and magnetic field sensor No. 2 over a period of time can be taken. Based on these data, the three-phase cable installation depth can be calculated to be 2.513m, which is very close to the actual installation depth of 2.5m.

[0104] 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 6 In the form of the function shown, the electronic device can directly obtain the first phase difference, the second phase difference, the third phase difference, as well as the peak values ​​of each magnetic field component and the amplitude of the resultant 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 resultant magnetic field being equal means that the three are assumed to be approximately equal, and any of the three can be used to calculate the laying depth.

[0105] In another embodiment, a three-phase power cable has a current peak value of 500A in 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, and a magnetic field sensor located at a horizontal plane 2.5m above the three-phase cable (i.e., a laying depth of H = 2.5m), the horizontal distance between No. 1 and No. 2 magnetic field sensors is 1m (i.e. d =1m). At this point, the z-axis magnetic field amplitudes of both magnetic field sensors are zero, indicating that the three-phase cable is laid parallel to the z-axis. With the center of magnetic field sensor No. 1 and sensor No. 2 as the coordinate origin, the x-axis coordinate of the three-phase cable is 0m (i.e., X = 0m). At this point, the three-phase cable is directly below the center of magnetic field sensor No. 1 and sensor No. 2. The phase difference between the x-axis magnetic field components measured by magnetic field sensor No. 1 and sensor No. 2 is 48.94°, and the phase difference between the y-axis magnetic field components measured by magnetic field sensor No. 1 and sensor No. 2 is 41.65°, resulting in an average phase difference of 45.29°. The average composite magnetic field value of magnetic field sensor No. 1 is 2309.2nT, and the average composite magnetic field value of magnetic field sensor No. 2 is 2308.7nT. Based on these data, the calculated laying depth of the three-phase cable is 2.497m, which is very close to the actual laying depth of 2.5m.

[0106] In another embodiment, a three-phase power cable has a current peak value of 500A in the three-phase conductors, a phase difference of 120° between the three conductors, a radius of 0.1m in the circle formed by the centers of the three-phase conductors, and a magnetic field sensor located 2.5m above the three-phase cable (i.e., a laying depth H = 2.5m). The horizontal distance between magnetic field sensors No. 1 and No. 2 is 1m (i.e., d =1m). At this point, the z-axis magnetic field amplitudes of both magnetic field sensors are zero, indicating that the three-phase cable is laid parallel to the z-axis. With the center of magnetic field sensor No. 1 and sensor No. 2 as the coordinate origin, the x-axis coordinate of the three-phase cable is 1m (i.e., X = 1m). At this point, the three-phase cable is to the right of both magnetic field sensor No. 1 and sensor No. 2. The phase difference between the x-axis magnetic field components measured by magnetic field sensor No. 1 and sensor No. 2 is 38.17°, and the phase difference between the y-axis magnetic field components measured by magnetic field sensor No. 1 and sensor No. 2 is 40.44°, resulting in an average phase difference of 39.31°. The average composite magnetic field value of magnetic field sensor No. 1 is 2308.7nT, and the average composite magnetic field value of magnetic field sensor No. 2 is 1765.4nT. Based on these data, the calculated laying depth of the three-phase cable is 2.501m, which is very close to the actual laying depth of 2.5m.

[0107] Based on the same inventive concept, the present disclosure also provides a device for locating the laying position of a three-phase cable. 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:

[0108] an acquisition module 71, configured to acquire, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component generated by the three-phase cable as 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 as 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;

[0109] a first determining module 72, configured to determine an angle γ formed between the three-phase cable and the first magnetic field sensor and the second magnetic field sensor based on 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 composite magnetic field of the first magnetic field sensor and the second magnetic field sensor;

[0110] The second determining module 73 is configured to determine the laying depth of the three-phase cable according to the included angle γ, the preset interval, and magnetic field information, wherein the magnetic field information comprises at least one of the following:

[0111] a peak value of a magnetic field component in the x-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the x-axis direction of the second magnetic field sensor;

[0112] a peak value of a magnetic field component in the y-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the y-axis direction of the second magnetic field sensor;

[0113] a peak value of a magnetic field component in the y-axis direction of the first magnetic field sensor and a peak value of a magnetic field component in the y-axis direction of the second magnetic field sensor;

[0114] Optionally, the first determining module 72 is configured to determine the included angle γ by one of the following formulas:

[0115]

[0116]

[0117]

[0118]

[0119] wherein, is the first phase difference, is the second phase difference, is the third phase difference.

[0120] Optionally, the second determining module 73 is configured to determine the laying depth by the following formula:

[0121]

[0122]

[0123] or by the following formula:

[0124]

[0125]

[0126] or by the following formula:

[0127]

[0128]

[0129] wherein, Xrepresents a distance between the three-phase cable and a center point in a horizontal direction, the center point being a center of the first magnetic field sensor and the second magnetic field sensor, H represents the laying depth, d represents the preset interval, is a peak value of a magnetic field component in an x-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in an x-axis direction of the second magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the second magnetic field sensor, represents an average of a resultant magnetic field amplitude of the first magnetic field sensor, represents an average of a resultant magnetic field amplitude of the second magnetic field sensor.

[0130] Optionally, the apparatus 70 further includes:

[0131] a third determining module configured to determine that a laying direction of the three-phase cable is parallel to a z-axis if a z-axis magnetic field component amplitude measured by the first magnetic field sensor is 0 and a z-axis magnetic field component amplitude measured by the second magnetic field sensor is 0.

[0132] 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 narrowband filter processing.

[0133] Optionally, the first magnetic field sensor and the second magnetic field sensor are placed at a preset interval in a horizontal direction.

[0134] As to the apparatus in the above-described embodiments, specific manners in which various modules perform operations have been described in details in the embodiments about the method, and thus will not be described in details here.

[0135] Figure 8 is a block diagram of an electronic device 700 according to an exemplary embodiment. As shown in Figure 8 the electronic device 700 can include a processor 701 and a memory 702. The electronic device 700 can also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0136] The processor 701 is configured to control overall operations of the electronic device 700 to complete all or part of the steps of the method for positioning a three-phase cable laying position described above. The memory 702 is configured to store various types of data to support operations of the electronic device 700, which can include, for example, instructions for any application or method operating on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, and the like. 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 (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The multimedia component 703 can include a screen and an audio component. The screen can be, for example, a touch screen, and the audio component is configured to output and / or input audio signals. For example, the audio component can include a microphone configured to receive external audio signals. The received audio signals can be further stored in the memory 702 or transmitted through the communication component 705. The audio component also includes at least one speaker configured to output audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, which can be a keyboard, a mouse, a button, and the like. The buttons can be virtual buttons or physical buttons. The communication component 705 is configured to perform 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, and the like, or a combination of one or more of them, is not limited herein. Therefore, the corresponding communication component 705 can include a Wi-Fi module, a Bluetooth module, an NFC module, and the like.

[0137] In an exemplary embodiment, the electronic device 700 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements for performing the above-mentioned method of locating a three-phase cable laying position.

[0138] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the above-mentioned method of locating a three-phase cable laying position. For example, the computer-readable storage medium can be the above-mentioned memory 702 including program instructions, which can be executed by the processor 701 of the electronic device 700 to complete the above-mentioned method of locating a three-phase cable laying position.

[0139] Figure 9 is a block diagram of an electronic device 1900 according to an exemplary embodiment. For example, the electronic device 1900 can be provided as a server. Referring to Figure 9 , the electronic device 1900 includes a processor 1922, the number of which can 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 can include one or more modules each corresponding to a set of instructions. In addition, the processor 1922 can be configured to execute the computer program to perform the above-mentioned method of locating a three-phase cable laying position.

[0140] In addition, the electronic device 1900 can further include a power supply component 1926, which can be configured to perform power management of the electronic device 1900, and a communication component 1950, which can be configured to implement communication of the electronic device 1900, such as wired or wireless communication. In addition, the electronic device 1900 can further include an input / output (I / O) interface 1958. The electronic device 1900 can operate based on an operating system stored in the memory 1932.

[0141] In another exemplary embodiment, a computer readable storage medium including program instructions is also provided, which when executed by a processor implement the steps of the above method for locating a three-phase cable laying position. For example, the non-transitory computer readable storage medium can be the above-mentioned memory 1932 including program instructions, which can be executed by the processor 1922 of the electronic device 1900 to complete the above-mentioned method for locating a three-phase cable laying position.

[0142] In another exemplary embodiment, a computer program product is also provided, which contains a computer program capable of being executed by a programmable device, the computer program having code portions for executing the above-mentioned method for locating a three-phase cable laying position when executed by the programmable device.

[0143] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0144] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not make further descriptions on various possible combinations.

[0145] Furthermore, various different embodiments of the present disclosure can also be combined in any manner as long as it does not deviate from the idea of the present disclosure, and it should be considered as the disclosed content of the present disclosure.

Claims

1. A method of locating a three-phase cable laying position, characterized by, The method comprises: acquiring, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component of a first magnetic field sensor measured from a three-phase cable, and a second x-axis magnetic field component and a second y-axis magnetic field component of a second magnetic field sensor measured from the three-phase cable, wherein the first magnetic field sensor and the second magnetic field sensor are arranged at a preset interval in a horizontal direction, 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; determining an included angle γ between a first straight line and a second straight line according to at least one of a first phase difference, a second phase difference and a third phase difference, the first straight line being a straight line formed by the first magnetic field sensor and a point in the three-phase cable, and the second straight line being a straight line formed by the second magnetic field sensor and the point in the three-phase cable, wherein the first phase difference is a phase difference between the x-axis magnetic field components of the first magnetic field sensor and the second magnetic field sensor, the second phase difference is a phase difference between the y-axis magnetic field components of the first magnetic field sensor and the second magnetic field sensor, and the third phase difference is a phase difference between the resultant magnetic field of the first magnetic field sensor and the resultant magnetic field of the second magnetic field sensor; determining a laying depth of the three-phase cable according to the included angle γ, the preset interval and magnetic field information, wherein the magnetic field information comprises at least one of: a peak value of the x-axis magnetic field component of the first magnetic field sensor and a peak value of the x-axis magnetic field component of the second magnetic field sensor; a peak value of the y-axis magnetic field component of the first magnetic field sensor and a peak value of the y-axis magnetic field component of the second magnetic field sensor; a resultant magnetic field amplitude of the first magnetic field sensor and a resultant magnetic field amplitude of the second magnetic field sensor; wherein the laying depth is determined by the following formula: or the laying depth is determined by the following formula: or the laying depth is determined by the following formula: wherein X denotes a distance between the three-phase cable and a center point in a horizontal direction, the center point being a center of the first magnetic field sensor and the second magnetic field sensor, H denotes the laying depth, d denotes the preset interval, is a peak value of a magnetic field component in an x-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in an x-axis direction of the second magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the second magnetic field sensor, denotes an average of a resultant magnetic field amplitude of the first magnetic field sensor, denotes an average of a resultant magnetic field amplitude of the second magnetic field sensor.

2. The method of claim 1, wherein, the included angle γ is determined by one of the following formulas: wherein is the first phase difference, is the second phase difference, is the third phase difference.

3. The method of claim 1, wherein, The method further comprises: determining 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.

4. 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 narrowband filter processing.

5. An apparatus for locating a three-phase cable laying position, characterized by The device comprises: The acquisition module is configured to acquire, under a specified condition, a first x-axis magnetic field component and a first y-axis magnetic field component of a first magnetic field sensor measured from a three-phase cable, and a second x-axis magnetic field component and a second y-axis magnetic field component of a second magnetic field sensor measured from the three-phase cable, wherein the first magnetic field sensor and the second magnetic field sensor are arranged at a preset interval in a horizontal direction, and the specified condition is that a z-axis magnetic field component measured by the first magnetic field sensor has an amplitude of 0 and a z-axis magnetic field component measured by the second magnetic field sensor has an amplitude of 0; The first determination module is configured to determine an included angle γ between a first straight line and a second straight line according to at least one of a first phase difference, a second phase difference, and a third phase difference, the first straight line being a straight line formed by the first magnetic field sensor and a point in the three-phase cable, and the second straight line being a straight line formed by the second magnetic field sensor and the point in the three-phase cable, wherein the first phase difference is a phase difference between x-axis magnetic field components of the first magnetic field sensor and the second magnetic field sensor, the second phase difference is a phase difference between y-axis magnetic field components of the first magnetic field sensor and the second magnetic field sensor, and the third phase difference is a phase difference between a resultant magnetic field of the first magnetic field sensor and a resultant magnetic field of the second magnetic field sensor; The second determination module is configured to determine a laying depth of the three-phase cable according to the included angle γ, the preset interval, and magnetic field information, wherein the magnetic field information includes at least one of the following: a peak value of an x-axis magnetic field component of the first magnetic field sensor and a peak value of an x-axis magnetic field component of the second magnetic field sensor; a peak value of a y-axis magnetic field component of the first magnetic field sensor and a peak value of a y-axis magnetic field component of the second magnetic field sensor; a resultant magnetic field amplitude of the first magnetic field sensor and a resultant magnetic field amplitude of the second magnetic field sensor; The second determination module is configured to determine the laying depth by using the following formula: or determine the laying depth by using the following formula: or determine the laying depth by using the following formula: wherein, X denotes a distance between the three-phase cable and a center point in a horizontal direction, the center point being a center of the first magnetic field sensor and the second magnetic field sensor, H denotes the laying depth, d denotes the preset interval, is a peak value of a magnetic field component in an x-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in an x-axis direction of the second magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the first magnetic field sensor, is a peak value of a magnetic field component in a y-axis direction of the second magnetic field sensor, denotes a mean value of a resultant magnetic field amplitude of the first magnetic field sensor, denotes a mean value of a resultant magnetic field amplitude of the second magnetic field sensor.

6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by a processor to implement the steps of the method in any one of claims 1-4.

7. An electronic device, comprising: comprise: 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 in any one of claims 1-4.

8. A computer program product comprising a computer program, characterized in that, The computer program is executed by a processor to implement the steps of the method in any one of claims 1-4. The computer program is executed by a processor to implement the steps of the method in any one of claims 1-4.

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