CN113433489B - Distributed transient magnetic field measuring device and method - Google Patents
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Abstract
The invention discloses a distributed transient magnetic field measuring device and a method, wherein the device comprises: the multi-mesh metal network member includes: a plurality of grids, each grid comprising: the device comprises a grid loop consisting of metal pipe conductors and a resistor connected in series in the grid loop; the multi-channel signal acquisition equipment is used for measuring the voltage at two ends of the resistor in each grid loop so as to obtain the voltage at two ends of each resistor; and the main processing equipment is used for calculating the induced current of each grid according to the voltage at two ends of each resistor and calculating the magnetic induction intensity at each grid according to the induced currents of all the grids. The invention breaks through the limitation of single metal loop induction measurement magnetic field, realizes multipoint synchronous measurement by constructing a multi-grid metal network and reversely deducing magnetic field distribution through current distribution, has the capability of synchronously measuring transient magnetic fields at a plurality of positions by a set of device, and creates conditions for obtaining the magnetic field space distribution characteristics in a test.
Description
Technical Field
The present invention relates to the field of magnetic field environment measurement technologies, and more particularly, to a distributed transient magnetic field measurement apparatus and method.
Background
When the transformer substation switch is operated, a transient magnetic field is generated in space, the amplitude is large, the rise time is short, the frequency band is wide, and the normal work of secondary equipment arranged in a local switch field can be interfered. The magnetic field distribution characteristic is obtained through measurement, which is a very important research means, and provides guidance and basis for the noise immunity requirement of the secondary equipment and the electromagnetic compatibility design of the secondary equipment.
The magnetic field measurement at home and abroad mainly adopts a B-DOT sensor, the B-DOT adopts a loop antenna, under the action of a changing magnetic field, loop inductance generates induced electromotive force, load resistance output is in a differential mode, and a magnetic field waveform can be obtained through an integrator. The loop antenna is also widely applied to electromagnetic environment measurement, is used in cooperation with a receiver, obtains a frequency domain signal, is suitable for measurement of continuous pulses, and has large limitation in transformer substation electromagnetic transient measurement. Magnetic field sensors based on the Faraday magneto-optical effect also have some applications, but are easily influenced by air humidity, mechanical vibration and the like, and the measurement stability is poor. The measurement system constructed by the magnetic field measurement method can only measure the magnetic field at a single position (namely, a single sensor corresponds to a single position), and if the magnetic fields at a plurality of positions need to be measured synchronously, namely, the spatial distribution characteristic of the magnetic field needs to be obtained, a plurality of sets of measurement systems need to be arranged, so that the technical economy is poor, and the implementation is difficult generally.
Disclosure of Invention
The invention provides a distributed transient magnetic field measuring device and a distributed transient magnetic field measuring method, which aim to solve the problem of how to realize distributed measurement of a transient magnetic field.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a distributed transient magnetic field measuring apparatus, the apparatus including: the system comprises a multi-grid metal network component, a multi-channel signal acquisition device and a main processing device; wherein,
the multi-mesh metal network member includes: a plurality of grids, each grid comprising: the device comprises a grid loop consisting of metal pipe conductors and a resistor connected in series in the grid loop;
the multi-channel signal acquisition equipment is connected with the resistor in each grid loop and used for measuring the voltage at two ends of the resistor in each grid loop so as to obtain the voltage at two ends of each resistor;
and the main processing equipment is connected with the multi-channel signal acquisition equipment and used for calculating the induction current of each grid according to the voltage and calculating the magnetic induction intensity of each grid according to the induction currents of all grids.
Preferably, the metal pipe conductor is of a hollow structure, the metal pipe conductor is disconnected at the resistor and connected with two ends of the resistor, a measuring cable between the multipath signal acquisition equipment and the resistor is connected with two ends of the resistor, and the measuring cable is arranged in the metal pipe.
Preferably, wherein the apparatus further comprises: a plurality of signal isolation devices; wherein,
each signal isolation device is arranged between the multi-channel signal acquisition device and the resistor in each grid loop and is used for isolating the signal in the measurement loop formed by the resistor and the signal isolation device from the signal in the acquisition loop formed by the signal isolation device and the multi-channel signal acquisition device; the signal isolation devices and the resistors are in one-to-one correspondence.
Preferably, the signal isolation device is a broadband electronic transformer or a differential circuit.
Preferably, wherein the apparatus further comprises:
the shielding device is arranged outside the signal isolation device and/or the multi-path signal acquisition device, the shielding device is positioned under the multi-grid metal network component, and the shielding device and the hollow structure of the multi-grid metal network component are overlapped to form a complete shielding body.
Preferably, the main processing device calculates the magnetic induction intensity at each grid according to the following formula based on the induced currents of all grids, including:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
According to another aspect of the present invention, there is provided a distributed transient magnetic field measurement method, the method comprising:
acquiring the voltage at two ends of each resistor of each grid in the multi-grid metal network component;
and calculating the induction current of each grid according to the voltage, and calculating the magnetic induction intensity at each grid according to the induction currents of all the grids.
Preferably, wherein the method further comprises: isolating signals in a measurement loop consisting of the resistor and the signal isolation equipment from signals in an acquisition loop consisting of the signal isolation equipment and the multi-channel signal acquisition equipment by using the signal isolation equipment; the signal isolation equipment and the resistors are in one-to-one correspondence.
Preferably, wherein the method further comprises: the signal isolation equipment is a broadband electronic transformer or a differential circuit.
Preferably, the calculating the magnetic induction at each grid according to the induced currents of all grids comprises:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
The invention provides a distributed transient magnetic field measuring device and a method, wherein the device comprises: the system comprises a multi-grid metal network component, a multi-channel signal acquisition device and a main processing device; wherein the multi-mesh metal network member comprises: a plurality of grids, each grid comprising: the device comprises a grid loop consisting of metal pipe conductors and a resistor connected in series in the grid loop; the multi-channel signal acquisition equipment is used for measuring the voltage at two ends of the resistor in each grid loop so as to obtain the voltage at two ends of each resistor; and the main processing equipment is used for calculating the induction current of each grid according to the voltage at two ends of each resistor and calculating the magnetic induction intensity at each grid according to the induction currents of all the grids. The invention breaks through the limitation of single metal loop induction measurement magnetic field, realizes multipoint synchronous measurement by constructing a multi-grid metal network and reversely deducing magnetic field distribution through current distribution, has the capability of synchronously measuring transient magnetic fields at a plurality of positions by a set of device and creates conditions for obtaining the magnetic field space distribution characteristics in a test.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of a distributed transient magnetic field measurement apparatus 100 according to an embodiment of the present invention;
FIG. 2 is a schematic view of a multi-mesh metal network element according to an embodiment of the present invention;
fig. 3 is a flow chart of a distributed transient magnetic field measurement method 300 according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of a distributed transient magnetic field measurement apparatus 100 according to an embodiment of the present invention. The distributed transient magnetic field measuring device provided by the embodiment of the invention breaks through the limitation of a single metal loop induction measuring magnetic field, realizes multipoint synchronous measurement by constructing a multi-grid metal network and reversely pushing magnetic field distribution through current distribution, has the capability of synchronously measuring transient magnetic fields at a plurality of positions by one set of device, and creates conditions for obtaining the spatial distribution characteristics of the magnetic field in a test. The distributed transient magnetic field measurement apparatus 100 according to an embodiment of the present invention includes: a multi-grid metal network component 101, a multi-channel signal acquisition device 102, and a main processing device 103.
Preferably, the multi-mesh metal network member 101 includes: a plurality of grids, each grid comprising: the circuit comprises a grid loop consisting of metal pipe conductors and a resistor connected in series in the grid loop.
Preferably, the metal pipe conductor is of a hollow structure, the metal pipe conductor is disconnected at the resistor and connected with two ends of the resistor, a measuring cable between the multipath signal acquisition equipment and the resistor is connected with two ends of the resistor, and the measuring cable is arranged in the metal pipe.
Preferably, the multi-channel signal acquisition device 102 is connected to the resistor in each grid loop, and is configured to measure a voltage across the resistor in each grid loop to obtain a voltage across each resistor.
Fig. 2 is a schematic view of a multi-mesh metal network element according to an embodiment of the invention. As shown in fig. 2, the multi-grid metal network member comprises 9 grids, and each grid is connected with a resistor in series. The induced current i of each grid is calculated by measuring the voltage at the two ends of each resistor, and the magnetic induction intensity B at each grid can be calculated according to the induced current of each grid, so that the distributed measurement of the magnetic field is realized.
Wherein, the relationship between the grid area and the resistance is as follows: for the same low frequency bandwidth requirement, the larger the grid area is, the larger the resistance of the resistor is. The relationship between the total area, the number of grids and the resolution is as follows: for the same total area, the more the number of grids is, the smaller the area of a single grid is, and the higher the resolution of a measurement space is; at the same time, the resistance amplitude needs to be reduced, and the resolution of the measured magnetic field amplitude is correspondingly reduced.
The number of grids can be set according to requirements. For example, 4, 9, 16, 25, etc.
Preferably, wherein the apparatus further comprises: a plurality of signal isolation devices; wherein,
each signal isolation device is arranged between the multi-channel signal acquisition device and the resistor in each grid loop and is used for isolating the signal in the measurement loop formed by the resistor and the signal isolation device from the signal in the acquisition loop formed by the signal isolation device and the multi-channel signal acquisition device; the signal isolation devices and the resistors are in one-to-one correspondence.
Preferably, the signal isolation device is a broadband electronic transformer or a differential circuit.
Preferably, wherein the apparatus further comprises:
the shielding device is arranged outside the signal isolation device and/or the multi-path signal acquisition device, the shielding device is positioned under the multi-grid metal network component, the shielding device and the hollow structure of the multi-grid metal network component are overlapped to form a complete shielding body, the induced current of each grid is obtained by measuring the voltage of the small resistor connected in series, and the voltage of the small resistor is transmitted to the oscilloscope through the coaxial cable for acquisition. In order to accurately measure the voltage signal, two measures are required to ensure: firstly, a measuring loop cannot be interfered by a space magnetic field, and a built-in shielding method is provided for the purpose: selecting a grid loop as a hollow metal pipe conductor, and disconnecting the pipe conductor at the small resistor and connecting two ends of the small resistor; the measuring cable is also connected with two ends of the small resistor, and the key point is that the measuring cable is arranged in the metal pipe to prevent the interference of an external magnetic field.
Secondly, the same reference potential must be determined when a plurality of measurement loops are synchronously acquired, so that a signal isolation method is provided: the method adopts a broadband electronic transformer to realize signal isolation, each broadband electronic transformer is arranged between each multi-path signal acquisition device and a resistor in each grid loop, and the broadband electronic transformer can isolate signals in a measurement loop formed by the resistors and the broadband electronic transformer from signals in an acquisition loop formed by the broadband electronic transformer and the multi-path signal acquisition devices. The other method is to adopt a differential voltage measurement method based on an operational amplifier to ensure that all signals are output to an oscilloscope (multi-channel signal acquisition equipment) for acquisition after being at the same reference potential; the three operational amplifiers form a differential circuit, voltage signals input into two ends of the resistor are output to each port of the multi-path signal acquisition equipment, and voltage information at two ends of all the resistors is at the same reference potential, so that signal isolation is realized, and the problem that each measurement loop does not have a reference ground is solved.
In the invention, the interior of the metal tube conductor is of a hollow structure, the metal tube conductor is disconnected at the resistor and connected with two ends of the resistor, a measuring cable between the resistors is wired in the metal conductor tube, and the reference ground is unified through a broadband electronic transformer or an operational amplifier differential circuit and then is connected to a multi-path signal acquisition device. The broadband electronic transformer or the operational amplifier differential circuit and the multi-path signal acquisition equipment are positioned in the same shielding equipment; the shielding body device is arranged right below the metal grid and is reliably lapped with the hollow structure of the metal grid to form a complete shielding body.
Preferably, the main processing device 103 is connected to the multiple signal collecting devices, and is configured to calculate an induced current of each grid according to the voltage across each resistor, and calculate the magnetic induction intensity at each grid according to the induced currents of all grids.
Preferably, the main processing device, calculating the magnetic induction intensity at each grid according to the induced currents of all grids, includes:
wherein，
Magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
The measurement principle of the embodiment of the invention is as follows: and constructing a multi-grid metal network, wherein under the action of a transient magnetic field, the metal grid generates induced current distribution, the distribution is sampled by arranging small resistors on each grid, and the current is obtained by a voltammetry method. If the small resistor is R (known), the voltage U at two ends of the resistor is measured, and the induced current can be calculated by a voltammetry method:
。
for a single ring (or referred to as: a single mesh), the following is satisfied:
in the formula, L is a loop inductance, S is a loop area, t is time, and B is magnetic induction intensity.
Low cut-off frequency of
Above this frequency, it can be approximated
I.e. to achieve an approximate cancellation of the magnetic flux within the loop, thereby achieving the effect of self-integration. Assuming a resistance of 1 Ω and an inductance of 1 μ H, the-3 dB low frequency bandwidth is 160 kHz.
For the multi-mesh metal mesh component shown in fig. 2, with a similar law, for magnetic field components above the low frequency bandwidth, the integral of the scattered magnetic field generated by the induced current (i.e., the magnetic flux) within each mesh is considered to completely cancel the magnetic flux generated by the incident magnetic field.
For the multi-grid metal network component shown in fig. 2, if grid current distribution is obtained through measurement, the magnetic field at the grid position can be obtained by integrating the scattered magnetic field generated by unit long line current in a certain grid through calculation, and the magnetic fields at other grid positions can be obtained in the same way, so that the synchronous measurement of the magnetic fields at multiple positions is realized. Description of the principle: assuming that the average magnetic induction intensity of an incident magnetic field at a certain ring position is
Then the flux of the incident field through a single ring is
. A scattered magnetic field ofMagnetic field generated by all the current of the metal ring in the ring, magnetic flux of scattered field passing through single ring
The calculation can be made based on the ring current distribution of the entire metal ring. Both incident and scattered magnetic fluxes cancel, i.e.
。
In the present invention, the measured grid current distribution can obtain the current of a single grid edge (labeled as i, i =1, 2, …, n), and then the magnetic induction intensity generated by the edge current at the first preset position in the grid to be calculated is:
the magnetic flux generated by all edge currents in the grid k to be calculated is:
the magnetic induction at grid k can thus be found to be:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
In the invention, the first preset position and the second preset position are set according to the calculation requirement. The distributed transient magnetic field measuring device provided by the invention has the capability of realizing multipoint synchronous measurement of a transient magnetic field by a set of device, so that the spatial distribution characteristics of the magnetic field can be accurately obtained, a basis can be provided for accurately providing the electromagnetic compatibility immunity requirement of the substation switch field equipment, and the application prospect and scale are huge.
Fig. 3 is a flow chart of a magnetic field measurement method 300 using a distributed transient magnetic field measurement device according to an embodiment of the present invention. As shown in fig. 3, the magnetic field measuring method 300 using the distributed transient magnetic field measuring apparatus according to the embodiment of the present invention includes:
And 302, calculating the induction current of each grid according to the voltage, and calculating the magnetic induction intensity of each grid according to the induction currents of all the grids.
Preferably, wherein the method further comprises:
isolating signals in a measurement loop consisting of the resistor and the signal isolation equipment from signals in an acquisition loop consisting of the signal isolation equipment and the multi-channel signal acquisition equipment by using the signal isolation equipment; the signal isolation equipment and the resistors are in one-to-one correspondence.
Preferably, the signal isolation device is a broadband electronic transformer or a differential circuit.
Preferably, wherein said
Calculating the magnetic induction intensity at each grid according to the induction current of all grids, comprising:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
The method 300 for measuring a transient magnetic field using a distributed system according to an embodiment of the present invention corresponds to the apparatus 100 for measuring a transient magnetic field using a distributed system according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A distributed transient magnetic field measurement device, the device comprising: the system comprises a multi-grid metal network component, a multi-channel signal acquisition device and a main processing device; wherein,
the multi-mesh metal network member includes: a plurality of grids, each grid comprising: the device comprises a grid loop consisting of metal conductor tubes and resistors connected in series in the grid loop;
the multi-channel signal acquisition equipment is connected with the resistor in each grid loop and used for measuring the voltage at two ends of the resistor in each grid loop so as to obtain the voltage at two ends of each resistor;
and the main processing equipment is connected with the multi-channel signal acquisition equipment and used for calculating the induced current of each grid according to the voltage at the two ends of each resistor and calculating the magnetic induction intensity of each grid according to the induced currents of all grids.
2. The apparatus of claim 1, wherein the metal conductor tube has a hollow structure inside, the metal conductor tube is disconnected at the resistor and connected with two ends of the resistor, and a multi-channel signal acquisition device and a measurement cable between the resistors are connected with two ends of the resistor, and the measurement cable is wired in the metal conductor tube.
3. The apparatus of claim 1, further comprising: a plurality of signal isolation devices; wherein,
each signal isolation device is arranged between the multi-channel signal acquisition device and the resistor in each grid loop and is used for isolating the signal in the measurement loop formed by the resistor and the signal isolation device from the signal in the acquisition loop formed by the signal isolation device and the multi-channel signal acquisition device; the signal isolation devices and the resistors are in one-to-one correspondence.
4. The apparatus of claim 3, wherein the signal isolation device is a broadband electronic transformer or a differential circuit.
5. The apparatus of claim 1, further comprising:
the shielding device is arranged outside the signal isolation device and/or the multi-path signal acquisition device, the shielding device is positioned under the multi-grid metal network component, and the shielding device and the hollow structure of the multi-grid metal network component are overlapped to form a complete shielding body.
6. The apparatus of claim 1, wherein the main processing device calculates the magnetic induction at each grid from the induced currents of all grids according to the following formula, comprising:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth grid；
Is the area of the kth grid;
generating magnetic induction intensity for the ith edge line in a first preset position of the corresponding grid;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
7. A method for distributed transient magnetic field measurement, the method comprising:
acquiring the voltage at two ends of each resistor of each grid in the multi-grid metal network component;
and calculating the induction current of each grid according to the voltage, and calculating the magnetic induction intensity at each grid according to the induction currents of all the grids.
8. The method of claim 7, further comprising:
isolating signals in a measurement loop consisting of the resistor and the signal isolation equipment from signals in an acquisition loop consisting of the signal isolation equipment and the multi-channel signal acquisition equipment by using the signal isolation equipment; the signal isolation equipment and the resistors are in one-to-one correspondence.
9. The method of claim 8, wherein the signal isolation device is a broadband electronic transformer or a differential circuit.
10. The method of claim 7, wherein calculating the magnetic induction at each grid from the induced currents of all grids comprises:
wherein,
magnetic induction at the kth grid;
is the magnetic flux at the kth mesh;
is the area of the kth grid;
for the ith edge in the first of the corresponding gridsMagnetic induction intensity generated in a preset position;
air permeability;
is the current on the ith side line;
is a grid edge vector;
a unit vector pointing to a first preset position of the corresponding grid from a second preset position on the ith edge line;
and the distance between the second preset position on the ith edge line and the first preset position of the corresponding grid is obtained.
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| CN206178121U (en) * | 2016-10-31 | 2017-05-17 | 重庆大学 | Modular substation grounding grid earth's surface magnetic field detecting system |
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| JP5924503B2 (en) * | 2014-01-31 | 2016-05-25 | 愛知製鋼株式会社 | Magnetic detector |
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| CN101216523A (en) * | 2007-12-28 | 2008-07-09 | 华北电力大学 | Substation grounding net defect diagnostic method and apparatus |
| CN102692607A (en) * | 2011-03-25 | 2012-09-26 | 深圳光启高等理工研究院 | Magnetic field identification device |
| CN204086508U (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | A kind of magnetic field measurement system of transformer station |
| CN204740336U (en) * | 2015-07-03 | 2015-11-04 | 北京师范大学 | Measure multi -thread ring of circuit board that magnetic field distributes |
| CN206178121U (en) * | 2016-10-31 | 2017-05-17 | 重庆大学 | Modular substation grounding grid earth's surface magnetic field detecting system |
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