CN103344844A - Grid security warning terminal and warning method thereof - Google Patents

Abstract

The invention relates to a grid security warning terminal which comprises a DGPS positioning module and a GPRS communication module, wherein the DGPS positioning module and the GPRS communication module are installed in a safety helmet. The grid security warning method includes the following steps that firstly, a position of an electromagnetic field source in a warning zone is determined; secondly, strength values of electromagnetic fields which are away from the electromagnetic field source by different distances are collected; thirdly, relation curves between the electromagnetic field intensity and the electromagnetic field source distances are generated and stored in a DSP digital signal control module as safety standards; fourthly, an electromagnetic induction module is used for collecting the strength of an electromagnetic field at the current position and calculating out a distance between a safety warning terminal and the electromagnetic field source according to the relation curves in the third step. Fifthly, if the distance obtained in the fourth step is within the safety zone or not is judged, if not, warning information is sent. The grid security warning terminal is worn on working personnel responsible for maintaining a power grid to judge whether the working personnel are within the safety zone or not and sends safety warn. Meanwhile, positions of the working personnel can be determined by transmitting information on personnel positions to DGPSs through the GPRS network.

Description

Power grid security caution terminal and alarming method for power thereof

Technical field

The present invention relates to a kind of terminal for the power grid security caution.

Background technology

In the electrical network maintenance process, because the electromagnetic field radiation that can produce certain intensity on every side of power equipment if the electromagnetic intensity radiation is strong excessively, can damage close staff.And for the grid equipment of different electric pressures, its electromagnetic field spacing that calculates according to magnetic field intensity can't come to guarantee staff's safety by a unified safe distance from also having nothing in common with each other.Simultaneously, in electrical network daily servicing process, staff's quantity is big, and work post is many, and managerial personnel can't determine that the people does personnel's position, and the gps satellite positioning system can't satisfy bearing accuracy.

Summary of the invention

One object of the present invention just provides a kind of power grid security caution terminal, it can accurately be located the network operation personnel, and the electromagnetic intensity intensity of testing personnel current location, send security warning, managerial personnel also can carry out the location, position to the staff by the remote monitoring center simultaneously.

This purpose of the present invention is to realize by such technical scheme, it includes DGPS locating module and the GPRS communication module that is installed in the safety helmet, the DGPS locating module receives pseudo-distance update information from the DGPS base station by the GPRS communication module, and the DGPS locating module also is sent to the remote monitoring center with the positional information of determining.

Further, described terminal also includes power supply, electromagnetic induction module, agc circuit, digital filter, DSP Digital Signals module and early warning module, electromagnetic intensity signal around electromagnetic induction module is used for gathering, after agc circuit and digital filter processing, be sent to DSP Digital Signals module, the DGPS locating module is sent to DPS Digital Signals module with positional information, DSP Digital Signals module controls early warning module is sent early warning information, and power supply is electromagnetic induction module, agc circuit, digital filter, the DGPS locating module, DSP Digital Signals module and early warning module provide working power.

Further, described terminal also includes voice module, and DSP Digital Signals module controls voice module sends phonetic warning information.

Further, described terminal also includes pilot lamp, and DSP Digital Signals module controls pilot lamp sends the light information warning.

Further, described DGPS locating module earthing GPRS communication module is sent to the DGPS base station with the positional information of determining, the DGPS base station is sent to the remote monitoring center by the internet with information.

Another object of the present invention just provides a kind of electromagnetism intensity safety alarm method, and it can be at the electromagnetic field of different electric pressures, calculate the actual distance with the electromagnetism field source, thereby whether the caution staff is positioned at the safety zone.

The objective of the invention is to realize that by such technical scheme concrete steps are as follows:

1) the caution terminal receives the pseudo-distance update information that the DGPS base station sends, go out to warn the current precise position information of terminal according to the pseudo-distance corrected Calculation, precise position information is sent to the DGPS base station, the DGPS base station is sent to the remote monitoring center by the internet with precise position information again;

2) the caution terminal is judged the electric pressure in caution terminal zone of living in according to area coordinate information and the current precise position information of default different electric pressures; If the caution terminal is positioned at the predeterminable area coordinate, then change step 3) over to, if outside the caution terminal location predeterminable area coordinate, then change step 6) over to;

3) the caution terminal is transferred the relation curve of distance with the electromagnetic intensity in this zone according to current electric pressure zone;

4) the caution terminal is obtained the electromagnetic intensity of current location, and integrating step 3) resulting distance and electromagnetic intensity relation curve, determine that the caution terminal is apart from the distance of electromagnetism field source, if this distance is less than safe distance, then change step 5) over to, if this distance greater than safe distance, then changes step 6) over to;

5) the caution terminal is sent warning message;

6) finish.

Further, the method that the caution terminal is calculated the current precise position information of caution terminal according to the pseudo-distance update information in the step 1) is pseudo range modified value method:

If the pseudo range observation equation of DGPS base station is:

P1=r1+c(dt1-dT)+drtrop1+drion1；

If the pseudo range observation equation of caution terminal is:

P2=r2+c(dt2-dT)+drtrop2+drion2；

Distance error by the DGPS base station

Dr=P1-r1=c(dt1-dT)+drtrop1+drion1

Push away

P2-Dr=r2+c(dt2-dT)+drtrop2+drion2-c(dt1-dT)-drtrop1-drion1

When DGPS base station and caution terminal at a distance of in 50 kilometers the time, the air path that the satellite signals that two stations receive pass through is similar, its atmospheric envelope retardation is very close namely

drtrop1@drtrop2drion1@drion2

Then

r2c=P2-Dr=r2+c(dt2-dt1)--------r2c；

In the formula, P1 is DGPS base station pseudo range, and r1 is the known accurate distance in DGPS base station, c (dt1-dT) satellite clock departure, and drtrop1 is to DGPS base station fluid layer retardation, drion1 is DGPS base station ionosphere delay amount; P2 is caution terminal measuring distance, and r2 is caution terminal accurate distance, and drtrop2 is to caution terminal fluid layer retardation, and drion1 is caution terminal ionosphere delay amount, and Dr is the distance error of DGPS base station.

Further, distance described in the step 3) with the method for making of the relation curve of electromagnetic intensity is:

3-1) use the collection of high accuracy number electromagnetic field tester apart from the electromagnetic intensity value of electromagnetism field source different distance;

3-2) adopt mobile least square method to step 3-1) in the electromagnetic intensity value and the distance value that collect carry out curve fitting, generate the electromagnetic field spacing from the electromagnetic intensity relation curve.

Step 3-2) concrete steps that adopt mobile least square method to carry out curve fitting described in are as follows:

3-1) set up least square method MLS fitting function:

$f\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Φ}}_I^k\left(x\right)y_I{\stackrel{..}{O}}^k\left(x\right)y$

Be shape function, k represents the exponent number of basis function;

${\stackrel{..}{O}}^k\left(x\right)=[{\mathrm{\Φ}}_1^k,{\mathrm{\Φ}}_2^k\mathrm{\Λ},{\mathrm{\Φ}}_3^k]=p^1\left(x\right)A^{-1}\left(x\right)B\left(x\right)$

Wherein: $A\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\Σ}}}w\left({x-x}_I\right)p\left(x_I\right)p^T\left(x_I\right)$

B(x)=[w(x-x ₁)P(x ₁),w(x-x ₂)

p(x ₂),Λ，w(x-x _n)p(x _n)]

y ^T＝[y ₁,y ₂，Λy _n]

In the formula, n is the number of range of influence interior nodes, and f (x) is fitting function, y _IBe x=x _IThe nodal value at place, y _I=y (x _I); W (x-x _I) be the weight function of node xI;

3-2) choose weight function, note s=x-x _I,

Then

$w\left(\stackrel{\&OverBar;}{s}\right)=\left\{\begin{array}{cc}\frac{2}{3}-4_s^{-2}+4_s^{-3}& (\stackrel{\&OverBar;}{s}\&le;\frac{1}{2})\\ \frac{4}{3}-4\stackrel{\&OverBar;}{s}+4_s^{-2}-\frac{4}{3}{\stackrel{\&OverBar;}{s}}^3& (\frac{1}{2}<\stackrel{\&OverBar;}{s}\&le;1)\\ 0& (\stackrel{\&OverBar;}{s}>1)\end{array}\right.$

3-3) with step 3-1) in the discrete data point (x that collects _i, y _i) substitution MLS fitting function, wherein x _iBe coordinate, y _iBe magnetic field intensity, try to achieve the electromagnetic field spacing from the electromagnetic intensity relation curve.

Further, described early warning module includes voice module and storer, and DSP Digital Signals module controls is transferred the voice messaging of storing in advance in the storer, and the control voice module sends the phonetic warning information of transferring.

Further, described early warning module includes pilot lamp, and DSP Digital Signals module controls pilot lamp sends the light information warning.

Owing to adopted technique scheme, the present invention to have following advantage:

The present invention is worn on one's body the electrical network maintenance staff, by the DGPS base station staff is carried out location, accurate position, personnel positions information is compared with default electric pressure area information, determine the residing electric pressure of staff zone, transfer the relation curve of distance with the electromagnetic intensity in this electric pressure zone again, in conjunction with detected electromagnetic intensity, judge whether to be positioned at the safety zone, send security warning.Simultaneously, the present invention is sent to DGPS by GPRS network with personnel positions information, is sent to the remote monitoring center by the internet again, is convenient to the position that managerial personnel determine the staff.

Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain instruction from the practice of the present invention.Target of the present invention and other advantages can realize and obtain by following instructions and claims.

Description of drawings

Description of drawings of the present invention is as follows.

Fig. 1 is system architecture synoptic diagram of the present invention;

Fig. 2 is the structural representation of caution terminal;

Fig. 3 is caution monitoring schematic flow sheet of the present invention;

Fig. 4 is charging equipment measuring point distribution schematic diagram;

Fig. 5 is the MLS fitting result curve map of Fig. 3.

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Power grid security caution terminal, include the DGPS locating module and the GPRS communication module that are installed in the safety helmet, the DGPS locating module receives pseudo-distance update information from the DGPS base station by the GPRS communication module, and the DGPS locating module also is sent to the remote monitoring center with the positional information of determining.

Described terminal also includes power supply, electromagnetic induction module, agc circuit, digital filter, DSP Digital Signals module and early warning module, electromagnetic intensity signal around electromagnetic induction module is used for gathering, after agc circuit and digital filter processing, be sent to DSP Digital Signals module, the DGPS locating module is sent to DPS Digital Signals module with positional information, DSP Digital Signals module controls early warning module is sent early warning information, and power supply is electromagnetic induction module, agc circuit, digital filter, the DGPS locating module, DSP Digital Signals module and early warning module provide working power.

Described terminal also includes voice module, and DSP Digital Signals module controls voice module sends phonetic warning information.

Described terminal also includes pilot lamp, and DSP Digital Signals module controls pilot lamp sends the light information warning.

Described DGPS locating module earthing GPRS communication module is sent to the DGPS base station with the positional information of determining, the DGPS base station is sent to the remote monitoring center by the internet with information.

The DGPS locating module receives the pseudo-distance update information by the DGPS base station, and the caution terminal is accurately located.DSP Digital Signals module is according to positional information, and compare with the default electric pressure area information stored in the storer, determine the residing electric pressure of staff zone, transfer the relation curve of distance with the electromagnetic intensity of this electric pressure zone correspondence again, in conjunction with the detected electromagnetic intensity of electromagnetic induction module, judge whether to be positioned at the safety zone, if not in the safety zone, then control voice module and send warning message.The monitoring of FLEX technological development dynamic electronic map is adopted at the remote monitoring center, realizes man-machine interaction, and handle the position that makes managerial personnel can grasp the staff in real time.

Concrete caution method for supervising of the present invention, concrete steps are as follows:

1) the caution terminal receives the pseudo-distance update information that the DGPS base station sends, go out to warn the current precise position information of terminal according to the pseudo-distance corrected Calculation, precise position information is sent to the DGPS base station, the DGPS base station is sent to the remote monitoring center by the internet with precise position information again;

2) the caution terminal is judged the electric pressure in caution terminal zone of living in according to area coordinate information and the current precise position information of default different electric pressures; If the caution terminal is positioned at the predeterminable area coordinate, then change step 3) over to, if outside the caution terminal location predeterminable area coordinate, then change step 6) over to;

3) the caution terminal is transferred the relation curve of distance with the electromagnetic intensity in this zone according to current electric pressure zone;

4) the caution terminal is obtained the electromagnetic intensity of current location, and integrating step 3) resulting distance and electromagnetic intensity relation curve, determine that the caution terminal is apart from the distance of electromagnetism field source, if this distance is less than safe distance, then change step 5) over to, if this distance greater than safe distance, then changes step 6) over to;

5) the caution terminal is sent warning message;

6) finish.

The present invention is when setting up the relation curve of distance and electromagnetic intensity, use high accuracy number electromagnetic field tester, test the electromagnetic field intensity value of different distance under the power transformation engineering environment repeatedly, according to known actual test specimens point, the funtcional relationship of finding out between the tested amount is drawn relation curve.

Adopt mobile least square method (Moving Least-Squares MLS) carries out curve fitting, with set up electromagnetic field intensity value and electromagnetic field spacing from relation curve.The distance of different electric pressures is used for satisfying the different substation requirement with the electromagnetic intensity relation curve.The safe early warning flow process as shown in Figure 2.

As shown in Figure 4, can obtain one group of discrete data point (x through measuring or gathering _i, y _i), i=1,2 ..., n, x here _iBe coordinate figure.Because these data points are not fully accurately, and the expression formula of function y=f (x) can't know in advance, need make approximating curve according to these discrete datas on given function class f.

On a local subdomain of fitted area, fitting function f (x) is expressed as:

$f\left(x\right)=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i\left(x\right)p_i\left(x\right)=p^T\left(x\right)\mathrm{\&alpha;}\left(x\right)$ （1）

α in the formula (x)=[α ₁(x), α ₂(x), Λ, α _m(x)] ^TBe coefficient to be asked, it is the function of coordinate x.

P (x)=[p ₁(x), p ₂(x), Λ, p _m(x)] ^TBe called basis function, it is a polynomial expression that the k rank are complete, and m is the item number of basis function.For example: for two-dimensional problems,

Linear basic p (x)=[1, x, y] ^T, m=3(2a)

Secondary base p (x)=[1, x, y, x ², xy, y ²] ^T, m=6(2b)

The discrete L of weighting below considering ₂Normal form, vector x=[x ₁, x ₂∧, x _n] L ₂Normal form

${\left|\right|x\left|\right|}_{-2}={\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{x_i}^2\right)}^{1/2}$

$f=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}w\left(x{-x}_I\right){\left[f\left(x\right){-y}_I\right]}^2=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}\left({x-x}_I\right){\left[p^T\left(x_i\right)\mathrm{\&alpha;}\left(x\right){-y}_i\right]}^2$ （3）

N is the number of range of influence interior nodes in the formula, and f (x) is fitting function, y _IBe x=x _IThe nodal value at place,

y _I=y (x _I); W (x-x _I) be node x _IWeight function.For determining factor alpha (x), formula (3) should minimalization.Differentiate gets formula (3) to α

$\stackrel{\text{\&PartialD;\&Integral;}}{\&PartialD;\mathrm{\&alpha;}}=\mathrm{\&Delta;}\left(x\right)\mathrm{\&alpha;}\left(x\right)-H\left(x\right)y=0$ （4）

α(x)=A ^-1(x)B(x)y（5）

Wherein

$A\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}w\left({x-x}_I\right)p\left(x_I\right)p^T\left(x_I\right)$

B(x)=[w(x-x ₁)p(x ₁)，w(x-x ₂)(7)

p(x ₂)，Λ，w(x-x _n)p(x _n)

y ^T＝[y ₁，y ₂，Λ，y _n](8)

With formula (5) substitution formula (1), just can obtain the MLS fitting function

$f\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&Phi;}}_I^k\left(x\right)y_I={\stackrel{..}{O}}^k\left(x\right)y$ (9)

Wherein

Be called shape function, k represents the exponent number of basis function

${\stackrel{..}{O}}^k\left(x\right)=[{\mathrm{\&Phi;}}_1^k,{\mathrm{\&Phi;}}_2^k\mathrm{\&Lambda;},{\mathrm{\&Phi;}}_3^k]=p^1\left(x\right)A^{-1}\left(x\right)B\left(x\right)$ (10)

If k=0, then basis function p (x)={ 1}, shape function at this moment are the Shepard function

${\stackrel{..}{O}}_I^{\mathrm{Shepard}}\left(x\right)=\frac{w\left({x-x}_I\right)}{{\mathrm{\&Sigma;}}_{J=1}^{n}w(x=x_J)}$ (11)

Even it should be noted that basis function p (x) is polynomial expression, the f (x) in the formula (9) also no longer is polynomial expression.If basis function p ∈ is C ^r, weight function w ∈ C ^s, fitting function f ∈ C then ^{Min (r, s)}

Choosing of weight function is the key of MLS match, and it has not only determined the slickness of matched curve, and directly determines calculated amount size and speed of convergence.Weight function w (x-X _I) should have tight property, just weight function is not equal to zero in the subdomain of x, is zero entirely outside this subdomain, and this subdomain is called the support region of weight function, i.e. the range of influence of x.The general circle of selecting is as the support region of weight function, and its radius is designated as S _MaxBecause tight property of weight function, the value of having only these to be included in the point-to-point x of data in the range of influence is influential.

Weight function w (x-x _I) should be non-negative, and along with || x-x ₁|| ₂The increase monotone decreasing.Weight function also should have certain slickness, because the fitting function meeting right of succession continuity of a function: if weight function w is (x-x _I) be C ¹Rank are continuous, and then fitting function also is C ¹Rank are continuous.

Weight function adopts splines, note s=x-xI, Then the cubic spline weight function as the formula (12).

The range of influence comprises abundant node, so that the A (x) in the formula (6) is reversible.

$w\left(\stackrel{\&OverBar;}{s}\right)=\left\{\begin{array}{cc}\frac{2}{3}-4_s^{-2}+4_s^{-3}& (\stackrel{\&OverBar;}{s}\&le;\frac{1}{2})\\ \frac{4}{3}-4\stackrel{\&OverBar;}{s}+4_s^{-2}-\frac{4}{3}{\stackrel{\&OverBar;}{s}}^3& (\frac{1}{2}<\stackrel{\&OverBar;}{s}\&le;1)\\ 0& (\stackrel{\&OverBar;}{s}>1)\end{array}\right.$ (12)

The basic thought that uses mobile least square method to carry out curve fitting is earlier with the fitted area gridding, obtains nodal value on the net point then, connects grid node at last and forms matched curve

Use mobile least square (MLS) method to discrete data point

x=[0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0]，

Y=[0,4,5,14,15,14.5,14,12,10,5,4] carry out curve fitting, fit procedure adopts linear basis function p (x)=[1, x] ^T, MLS fitting result curve map as shown in Figure 5.

Embodiment:

Actual modeling process uses the equidistant traverse measurement magnetic induction density of high accuracy number electromagnetic field tester level with the magnetic-field measurement data instance of 220KV charging equipment, then measured value is carried out matched curve and handles.Measuring equipment is arranged as shown in Figure 6.MLS matched curve figure as shown in Figure 5.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1. power grid security is warned terminal, it is characterized in that: described terminal includes DGPS locating module and the GPRS communication module that is installed in the safety helmet, the DGPS locating module receives pseudo-distance update information from the DGPS base station by the GPRS communication module, and the DGPS locating module also is sent to the remote monitoring center with the positional information of determining.

2. power grid security as claimed in claim 1 is warned terminal, it is characterized in that: described terminal also includes power supply, electromagnetic induction module, agc circuit, digital filter, DSP Digital Signals module and early warning module, electromagnetic intensity signal around electromagnetic induction module is used for gathering, after agc circuit and digital filter processing, be sent to DSP Digital Signals module, the DGPS locating module is sent to DPS Digital Signals module with positional information, DSP Digital Signals module controls early warning module is sent early warning information, and power supply is electromagnetic induction module, agc circuit, digital filter, the DGPS locating module, DSP Digital Signals module and early warning module provide working power.

3. power grid security as claimed in claim 2 is warned terminal, and it is characterized in that: described terminal also includes voice module, and DSP Digital Signals module controls voice module sends phonetic warning information.

4. power grid security as claimed in claim 2 is warned terminal, and it is characterized in that: described terminal also includes pilot lamp, and DSP Digital Signals module controls pilot lamp sends the light information warning.

5. power grid security as claimed in claim 1 is warned terminal, it is characterized in that: described DGPS locating module earthing GPRS communication module is sent to the DGPS base station with the positional information of determining, the DGPS base station is sent to the remote monitoring center by the internet with information.

6. as the alarming method for power of caution terminal as described in any one of the claim 1-5, it is characterized in that concrete steps are as follows:

1) the caution terminal receives the pseudo-distance update information that the DGPS base station sends, go out to warn the current precise position information of terminal according to the pseudo-distance corrected Calculation, precise position information is sent to the DGPS base station, the DGPS base station is sent to the remote monitoring center by the internet with precise position information again;

2) the caution terminal is judged the electric pressure in caution terminal zone of living in according to area coordinate information and the current precise position information of default different electric pressures; If the caution terminal is positioned at the predeterminable area coordinate, then change step 3) over to, if outside the caution terminal location predeterminable area coordinate, then change step 6) over to;

3) the caution terminal is transferred the relation curve of distance with the electromagnetic intensity in this zone according to current electric pressure zone;

4) the caution terminal is obtained the electromagnetic intensity of current location, and integrating step 3) resulting distance and electromagnetic intensity relation curve, determine that the caution terminal is apart from the distance of electromagnetism field source, if this distance is less than safe distance, then change step 5) over to, if this distance greater than safe distance, then changes step 6) over to;

5) the caution terminal is sent warning message;

6) finish.

7. power grid security alarming method for power as claimed in claim 6 is characterized in that, the method that the caution terminal is calculated the current precise position information of caution terminal according to the pseudo-distance update information in the step 1) is pseudo range modified value method:

If the pseudo range observation equation of DGPS base station is:

P1=r1+c(dt1-dT)+drtrop1+drion1；

If the pseudo range observation equation of caution terminal is:

P2=r2+c(dt2-dT)+drtrop2+drion2；

Distance error by the DGPS base station

Dr=P1-r1=c(dt1-dT)+drtrop1+drion1

Push away

P2-Dr=r2+c(dt2-dT)+drtrop2+drion2-c(dt1-dT)-drtrop1-drion1

When DGPS base station and caution terminal at a distance of in 50 kilometers the time, the air path that the satellite signals that two stations receive pass through is similar, its atmospheric envelope retardation is very close namely

drtrop1@drtrop2drion1@drion2

Then

r2c=P2-Dr=r2+c(dt2-dt1)--------r2c；

In the formula, P1 is DGPS base station pseudo range, and r1 is the known accurate distance in DGPS base station, c (dt1-dT) satellite clock departure, and drtrop1 is to DGPS base station fluid layer retardation, drion1 is DGPS base station ionosphere delay amount; P2 is caution terminal measuring distance, and r2 is caution terminal accurate distance, and drtrop2 is to caution terminal fluid layer retardation, and drion1 is caution terminal ionosphere delay amount, and Dr is the distance error of DGPS base station.

8. power grid security alarming method for power as claimed in claim 6 is characterized in that: distance described in the step 3) with the method for making of the relation curve of electromagnetic intensity is:

3-1) use the collection of high accuracy number electromagnetic field tester apart from the electromagnetic intensity value of electromagnetism field source different distance;

3-2) adopt mobile least square method to step 3-1) in the electromagnetic intensity value and the distance value that collect carry out curve fitting, generate the electromagnetic field spacing from the electromagnetic intensity relation curve.

Step 3-2) concrete steps that adopt mobile least square method to carry out curve fitting described in are as follows:

3-1) set up least square method MLS fitting function:

$f\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&Phi;}}_I^k\left(x\right)y_I{\stackrel{..}{O}}^k\left(x\right)y$

Be shape function, k represents the exponent number of basis function;

${\stackrel{..}{O}}^k\left(x\right)=[{\mathrm{\&Phi;}}_1^k,{\mathrm{\&Phi;}}_2^k\mathrm{\&Lambda;},{\mathrm{\&Phi;}}_3^k]=p^1\left(x\right)A^{-1}\left(x\right)B\left(x\right)$

Wherein: $A\left(x\right)=\underset{I=1}{\overset{n}{\mathrm{\&Sigma;}}}w\left({x-x}_I\right)p\left(x_I\right)p^T\left(x_I\right)$

B(x)=[w(x-x ₁)p(x ₁)，w(x-x ₂)

p(x ₂)，Λ，w(x-x _n)p(x _n)]

y ^T=[y ₁，y ₂，Λ，y _n]

In the formula, n is the number of range of influence interior nodes, and f (x) is fitting function, y _IBe x=x _IThe nodal value at place, y _I=y (x _I); W (x-x _I) be node x _IWeight function;

3-2) choose weight function, note s=x-x _I,

Then

$w\left(\stackrel{\&OverBar;}{s}\right)=\left\{\begin{array}{cc}\frac{2}{3}-4_s^{-2}+4_s^{-3}& (\stackrel{\&OverBar;}{s}\&le;\frac{1}{2})\\ \frac{4}{3}-4\stackrel{\&OverBar;}{s}+4_s^{-2}-\frac{4}{3}{\stackrel{\&OverBar;}{s}}^3& (\frac{1}{2}<\stackrel{\&OverBar;}{s}\&le;1)\\ 0& (\stackrel{\&OverBar;}{s}>1)\end{array}\right.$

3-3) with step 3-1) in the discrete data point (x that collects _i, y _i) substitution MLS fitting function, wherein x _iBe coordinate, y _iBe magnetic field intensity, try to achieve the electromagnetic field spacing from the electromagnetic intensity relation curve.

9. power grid security alarming method for power as claimed in claim 6, it is characterized in that: described early warning module includes voice module and storer, DSP Digital Signals module controls is transferred the voice messaging of storing in advance in the storer, and the control voice module sends the phonetic warning information of transferring.

10. power grid security alarming method for power as claimed in claim 6, it is characterized in that: described early warning module includes pilot lamp, and DSP Digital Signals module controls pilot lamp sends the light information warning.

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