CN103344844B - The alarming method for power of power grid security warning terminal - Google Patents

Abstract

Power grid security warning terminal, includes and is arranged on DGPS locating module in safety helmet and GPRS communication module.Power grid security alarming method for power, concrete steps are as follows: the position 1) determining the Electromagnetic Sources warned in region; 2) the electromagnetic field intensity angle value of distance Electromagnetic Sources different distance is gathered; 3) Electromagnetic Sources distance and electromagnetic intensity relation curve is generated; And be stored in DSP Digital Signals module as safety standard; 4) electromagnetic induction module gathers current location electromagnetic intensity, according to step 3) in relation curve calculate the distance of security warning terminal distance Electromagnetic Sources; 5) determining step 4) in the distance that obtains whether be positioned at safety zone, if not, then send warning message.The present invention is worn on it power grid maintenance staff, can judge whether to be positioned at safety zone, send security warning.Meanwhile, personnel location information is sent to DGPS by GPRS network by the present invention, determines the position of staff.

Description

The alarming method for power of power grid security warning terminal

Technical field

The present invention relates to the alarming method for power of a kind of power grid security warning terminal.

Background technology

In power grid maintenance process, the surrounding due to power equipment can produce the electromagnetic field radiation of some strength, if electromagnetic intensity is by force irradiated, can damage close staff.And for the grid equipment of different electric pressure, its Electromagnetic Sources distance calculated according to magnetic field intensity is also different, cannot come ensure by a unified safe distance safety of staff.Meanwhile, in electrical network routine maintenance procedure, crew numbers is large, and work post is many, and managerial personnel cannot determine that people does the position of personnel, and gps satellite positioning system cannot meet positioning precision.

Summary of the invention

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

This object of the present invention is realized by such technical scheme, it includes and is arranged on DGPS locating module in safety helmet and GPRS communication module, DGPS locating module receives the pseudo-distance update information from DGPS base station by GPRS communication module, and the positional information determined also is sent to remote monitoring center by DGPS locating module.

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

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

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

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

Another object of the present invention is just to provide a kind of electromagnetism intensity safety alarm method, and it for the electromagnetic field of different electric pressure, can calculate the actual distance with Electromagnetic Sources, thus whether warning staff is positioned at safety zone.

The object of the invention is by such technical scheme realize, concrete steps are as follows:

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

2) warning terminal according to presetting the area coordinate information of different electric pressure and current precise position information, judging the electric pressure in region residing for warning terminal; If warning terminal is positioned at predeterminable area coordinate, then proceed to step 3), if outside warning terminal location predeterminable area coordinate, then proceed to step 6);

3) warn terminal and transfer the distance in this region and the relation curve of electromagnetic intensity according to current voltage hierarchical region;

4) electromagnetic intensity that terminal obtains current location is warned, and integrating step 3) distance that obtains and electromagnetic intensity relation curve, determine the distance warning terminal distance Electromagnetic Sources, if this distance is less than safe distance, then proceed to step 5), if this distance is greater than safe distance, then proceed to step 6);

5) warn terminal and send warning message;

6) terminate.

Further, step 1) in the warning terminal method that calculates warning terminal current precise position information according to pseudo-distance update information be 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 warning terminal is:

P2＝r2+c(dt2-dT)+drtrop2+drion2；

By the distance error of 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 warning terminal are apart within 50 kilometers, the air path that the satellite signals that two stations receive pass through is similar, and its atmospheric envelope retardation is very close namely

drtrop1@drtrop2drion1@drion2

Then

r2c＝P2-Dr＝r2+c(dt2-dt1)--------r2c；

In formula, P1 is DGPS base station pseudo range, and r1 is the known accurate distance in DGPS base station, c (dt1-dT) satellite clock biases amount, and drtrop1 is to DGPS base station tropospheric delay amount, and drion1 is DGPS base station ionospheric delay; P2 is warning terminal measuring distance, and r2 is warning terminal accurate distance, and drtrop2 is that drion1 is warning terminal ionospheric delay, and Dr is the distance error of DGPS base station to warning terminal tropospheric delay amount.

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

High accuracy number electromagnetic field tester 3-1) is used to gather the electromagnetic field intensity angle value of distance Electromagnetic Sources different distance;

3-2) adopt Moving Least to step 3-1) in the electromagnetic field intensity angle value that collects and distance value carry out curve fitting, generate Electromagnetic Sources distance and electromagnetic intensity relation curve.

Step 3-2) described in adopt Moving Least to carry out curve fitting concrete steps as follows:

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

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

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

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

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

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 formula, n is the number of range of influence interior nodes, and f (x) is fitting function, y _ix=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

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

3-3) by step 3-1) in the discrete data point (x that collects _i, y _i) substitute into MLS fitting function, wherein x _ifor coordinate, y _ifor magnetic field intensity, try to achieve Electromagnetic Sources distance and electromagnetic intensity relation curve.

Further, described warning module includes voice module and storer, and DSP Digital Signals module controls to transfer the voice messaging prestored in storer, and controls voice module and send the phonetic warning information transferred.

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

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

The present invention is worn on it power grid maintenance staff, by DGPS base station, location, accurate position is carried out to staff, personnel location information is compared with the electric pressure area information preset, determine the electric pressure region residing for staff, transfer the distance in this electric pressure region and the relation curve of electromagnetic intensity again, in conjunction with the electromagnetic intensity detected, judge whether to be positioned at safety zone, send security warning.Meanwhile, personnel location information is sent to DGPS by GPRS network by the present invention, then is sent to remote monitoring center by internet, is convenient to the position that managerial personnel determine 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 will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by instructions below and claims and be obtained.

Accompanying drawing explanation

Accompanying drawing of the present invention is described as follows.

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

Fig. 2 is the structural representation of warning terminal;

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

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

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

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described.

Power grid security warning terminal, include and be arranged on DGPS locating module in safety helmet and GPRS communication module, DGPS locating module receives the pseudo-distance update information from DGPS base station by GPRS communication module, and the positional information determined also is sent to remote monitoring center by DGPS locating module.

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

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

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

The positional information determined is sent to DGPS base station by described DGPS locating module earthing GPRS communication module, and information is sent to remote monitoring center by internet by DGPS base station.

DGPS locating module receives the pseudo-distance update information by DGPS base station, and accurately locates warning terminal.DSP Digital Signals module is according to positional information, and compared with the electric pressure area information preset stored in storer, determine the electric pressure region residing for staff, transfer the relation curve of distance corresponding to this electric pressure region and electromagnetic intensity again, in conjunction with the electromagnetic intensity that electromagnetic induction module detects, judge whether to be positioned at safety zone, if not in safety zone, then control voice module and send warning message.Remote monitoring center adopts the monitoring of FLEX technological development dynamic electronic map, realizes man-machine interaction, enables managerial personnel grasp the position process of staff in real time.

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

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

2) warning terminal according to presetting the area coordinate information of different electric pressure and current precise position information, judging the electric pressure in region residing for warning terminal; If warning terminal is positioned at predeterminable area coordinate, then proceed to step 3), if outside warning terminal location predeterminable area coordinate, then proceed to step 6);

3) warn terminal and transfer the distance in this region and the relation curve of electromagnetic intensity according to current voltage hierarchical region;

4) electromagnetic intensity that terminal obtains current location is warned, and integrating step 3) distance that obtains and electromagnetic intensity relation curve, determine the distance warning terminal distance Electromagnetic Sources, if this distance is less than safe distance, then proceed to step 5), if this distance is greater than safe distance, then proceed to step 6);

5) warn terminal and send warning message;

6) terminate.

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

Moving Least (Moving Least-Squares, MLS) is adopted to carry out curve fitting, to set up the relation curve of electromagnetic field intensity values and Electromagnetic Sources distance.Distance and the electromagnetic intensity relation curve of different electric pressure are used for meeting different substation requirement.Safe early warning flow process as shown in Figure 2.

As shown in Figure 4, one group of discrete data point (x can be obtained through measuring or gathering _i, y _i), i=1,2 ..., n, here x _ifor coordinate figure.Due to these data points and non-fully is accurate, and the expression formula of function y=f (x) cannot be known in advance, needs to 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:

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

α (x) in formula=[a ₁(x), a ₂(x), Λ, a _m(x)] ^tfor 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 the complete polynomial expressions in k rank, and m is the item number of basis function.Such as: for two-dimensional problems,

Linear base 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)

Consider the discrete L of weighting below ₂normal form, vector x=[x ₁, x ₂∧, x _n] L ₂normal form $\left|\right|x|{|}_{-2}=({\underset{i=1}{\overset{n}{\&Sigma;}}{x_i}^2)}^{1/2}$

$J=\underset{I=1}{\overset{n}{\&Sigma;}}W(x-x_I){\&lsqb;f\left(x\right)-y_I\&rsqb;}^2=\underset{I=1}{\overset{n}{\&Sigma;}}w(x-x_I){\&lsqb;p^T\left(x_I\right)\mathrm{\&alpha;}\left(x\right)-y_I\&rsqb;}^2---\left(3\right)$

In formula, n is the number of range of influence interior nodes, and f (x) is fitting function, y _ix=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.Formula (3) obtains α differentiate

$\frac{\&part;J}{\&part;\mathrm{\&alpha;}}=A\left(x\right)\mathrm{\&alpha;}\left(x\right)-B\left(x\right)y=0---\left(4\right)$

α(x)＝A ^-1(x)B(x)y (5)

Wherein

$A\left(x\right)=\underset{I=1}{\overset{n}{\&Sigma;}}w(x-x_I)p\left(x_I\right)p^T\left(x_I\right)---\left(6\right)$

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)

Formula (5) is substituted into formula (1), just can obtain MLS fitting function

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

Wherein be called shape function, k represents the exponent number of basis function

${\stackrel{\&CenterDot;\&CenterDot;}{O}}^k\left(x\right)=\&lsqb;{\mathrm{\&Phi;}}_1^k,{\mathrm{\&Phi;}}_2^k,\mathrm{\&Lambda;},{\mathrm{\&Phi;}}_n^k\&rsqb;=p^T\left(x\right)A^{-1}\left(x\right)B\left(x\right)---\left(10\right)$

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

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

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

Choosing of weight function is the key of MLS matching, and it not only determines the slickness of matched curve, and directly determines calculated amount size and speed of convergence.Weight function w (x-x _i) should compact sup-port be had, namely weight function is not equal to zero in a subdomain of x, and be zero entirely outside this subdomain, this subdomain is called the support region of weight function, i.e. the range of influence of x.General circle of selecting is as the support region of weight function, and its radius is designated as S _max.Due to the compact sup-port of weight function, the value of these point-to-point x of data be included in range of influence is only had to have impact.

Weight function w (x-x _i) should be non-negative, and along with || x-x ₁|| ₂increase 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 continuous print, then fitting function is also C ¹rank continuous print.

Weight function adopts splines, note s=x-x _i, then cubic spline weight function is such as formula shown in (12).

Range of influence comprises abundant node, to make the A (x) in formula (6) reversible.

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

The basic thought using Moving Least to carry out curve fitting is first by fitted area gridding, then obtains nodal value on net point, finally connects grid node and forms matched curve

Use Moving Least Squares (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] carries out curve fitting, and fit procedure adopts linear fundament function p (x)=[1, x] ^t, MLS fitting result curve map as shown in Figure 5.

Embodiment:

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

What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.

Claims (5)

1. the alarming method for power of power grid security warning terminal, it is characterized in that: described terminal includes and is arranged on DGPS locating module in safety helmet and GPRS communication module, DGPS locating module receives the pseudo-distance update information from DGPS base station by GPRS communication module, and the positional information determined also is sent to remote monitoring center by DGPS locating module, described terminal also includes power supply, electromagnetic induction module, agc circuit, digital filter, DSP Digital Signals module and warning module, electromagnetic induction module is for gathering the electromagnetic intensity signal of surrounding, after agc circuit and digital filter process, be sent to DSP Digital Signals module, positional information is sent to DPS Digital Signals module by DGPS locating module, DSP Digital Signals module controls warning module and sends early warning information, power supply is electromagnetic induction module, agc circuit, digital filter, DGPS locating module, DSP Digital Signals module and warning module provide working power, described terminal also includes voice module, and DSP Digital Signals module controls voice module and sends phonetic warning information, described terminal also includes pilot lamp, and DSP Digital Signals module controls pilot lamp and sends light warning information, the positional information determined is sent to DGPS base station by described DGPS locating module earthing GPRS communication module, and information is sent to remote monitoring center by internet by DGPS base station,

The alarming method for power of described power grid security warning terminal, concrete steps are as follows:

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

2) warning terminal according to presetting the area coordinate information of different electric pressure and current precise position information, judging the electric pressure in region residing for warning terminal; If warning terminal is positioned at predeterminable area coordinate, then proceed to step 3), if outside warning terminal location predeterminable area coordinate, then proceed to step 6);

3) warn terminal and transfer the distance in this region and the relation curve of electromagnetic intensity according to current voltage hierarchical region;

4) electromagnetic intensity that terminal obtains current location is warned, and integrating step 3) distance that obtains and electromagnetic intensity relation curve, determine the distance warning terminal distance Electromagnetic Sources, if this distance is less than safe distance, then proceed to step 5), if this distance is greater than safe distance, then proceed to step 6);

5) warn terminal and send warning message;

6) terminate.

2. the alarming method for power of power grid security warning terminal as claimed in claim 1, is characterized in that, step 1) in the warning terminal method that calculates the current precise position information of warning terminal according to pseudo-distance update information be 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 warning terminal is:

P2＝r2+c(dt2-dT)+drtrop2+drion2；

By the distance error of 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 warning terminal are apart within 50 kilometers, the air path that the satellite signals that two stations receive pass through is similar, and its atmospheric envelope retardation is very close namely

drtrop1@drtrop2drion1@drion2

Then

r2c＝P2-Dr＝r2+c(dt2-dt1)；

In formula, P1 is DGPS base station pseudo range, and r1 is the known accurate distance in DGPS base station, c (dt1-dT) satellite clock biases amount, and drtrop1 is to DGPS base station tropospheric delay amount, and drion1 is DGPS base station ionospheric delay; P2 is warning terminal measuring distance, and r2 is warning terminal accurate distance, and drtrop2 is that drion2 is warning terminal ionospheric delay, and Dr is the distance error of DGPS base station to warning terminal tropospheric delay amount.

3. the alarming method for power of power grid security warning terminal as claimed in claim 1, is characterized in that: step 3) described in the method for making of relation curve of distance and electromagnetic intensity be:

High accuracy number electromagnetic field tester 3-1) is used to gather the electromagnetic field intensity angle value of distance Electromagnetic Sources different distance;

3-2) adopt Moving Least to step 3-1) in the electromagnetic field intensity angle value that collects and distance value carry out curve fitting, generate Electromagnetic Sources distance and electromagnetic intensity relation curve;

Step 3-2) described in adopt Moving Least to carry out curve fitting concrete steps as follows:

3-2-1) set up least square method MLS fitting function:

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

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

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

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

B(x)＝[w(x-x ₁)p(x ₁)，w(x-x ₂)

p(x ₂)，Λ，w(x-x _n)p(x _n)]

In formula, n is the number of range of influence interior nodes, and f (x) is fitting function, y _ix=x _ithe nodal value at place, y _i=y (x _i); W (x-x _i) be node x _iweight function;

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

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

3-2-3) by step 3-1) in the discrete data point (x that collects _i, y _i), i=1,2 ..., n; Substitute into MLS fitting function, wherein x _ifor the coordinate of electromagnetic field tester, y _ifor magnetic field intensity, try to achieve Electromagnetic Sources distance and electromagnetic intensity relation curve.

4. the alarming method for power of power grid security warning terminal as claimed in claim 1, it is characterized in that: described warning module includes voice module and storer, DSP Digital Signals module controls to transfer the voice messaging prestored in storer, and controls voice module and send the phonetic warning information transferred.

5. the alarming method for power of power grid security warning terminal as claimed in claim 1, it is characterized in that: described warning module includes pilot lamp, DSP Digital Signals module controls pilot lamp and sends light warning information.