CN104977492A - 10kV power distribution pole grounding state evaluation system and 10kV power distribution pole grounding state evaluation method - Google Patents

Abstract

The invention discloses a 10kV power distribution pole grounding state evaluation method which comprises the following steps: generating an impulse current wave by an impulse current wave generating module, and applying the impulse current wave on the grounding portion of a to-be-evaluated 10kV power distribution pole; acquiring a transient response voltage waveform at the grounding portion of the to-be-evaluated 10kV power distribution pole by a double-channel transient voltage waveform acquiring module; drawing a current impulse response curve by a data analyzing and processing module according to the acquired transient response voltage waveform; computing a correlation coefficient between the current impulse response curve and a historical impulse response curve by a correlation coefficient computing module; evaluating the operation state at the grounding portion of the 10kV power distribution pole by a state evaluating module according to the correlation coefficient; and displaying the evaluation result for the operation state at the grounding portion of the 10kV power distribution pole by a client. The 10KV power distribution pole grounding state evaluation method does not require digging at the grounding portion of the 10kV power distribution pole, grounding conduction sampling or soil sampling, thereby greatly reducing workload and realizing convenient operation and no restriction by a field operation condition.

Description

A kind of 10kV distribution shaft tower ground state evaluating system and appraisal procedure

Technical field

The present invention relates to electric system grounded screen field tests, be specifically related to a kind of 10kV distribution shaft tower ground state evaluating system and appraisal procedure.

Background technology

10kV distribution tower grounding is the critical facility guaranteeing shaft tower and affiliated electrical equipment safe operation thereof.Particularly under thunderbolt operating mode, because earthing device is embedded in underground, often because of soil corrosion for many years, cause grounding body to attenuate and even rupture, also likely stolenly to dig.At present, engineering generally measures power frequency earthing resistance by megger to the detection of 10kV distribution tower grounding performance quality and indirectly judges, but the characteristic showed under lightning impulse operating mode and transient state short circuit cannot be understood.This makes to meet standard-required after operation maintenance personnel carries out power frequency earthing resistance detection, and 10kV distribution line Frequent trip under thunder and lightning equally also can occur, and even breaks attached electrical equipment on shaft tower (such as the visual plant such as on-pole switch, bar change).This is because it is 50Hz or close to the power-frequency earthing resistance value under 50Hz that at present conventional power frequency earthing resistance detects the impedance ground value obtained, but in fact 10kV distribution shaft tower is short-circuited earth fault, or under Lightning Incoming Wave or operation ripple effect, the transient state impulse grounding characteristic of earthing device plays a decisive role.Therefore only measure power-frequency earthing impedance can not represent 10kV distribution tower grounding completely can safe operation under fault condition.

Summary of the invention

The object of the present invention is to provide a kind of 10kV distribution shaft tower ground state evaluating system and appraisal procedure, do not need to excavate 10kV distribution tower grounding, do not need to carry out earth conductor sampling and soil sample, greatly reduce workload, easy to operate, not by the restriction of on-the-spot service condition.

In order to achieve the above object, the present invention is achieved through the following technical solutions: a kind of 10kV distribution shaft tower ground state evaluating system, is characterized in, comprises:

Dash current ripple generation module, for exporting dash current ripple, and puts on 10kV distribution tower grounding place to be assessed by dash current ripple;

Binary channels transient voltage waveform acquisition module, for gathering the transient response voltage waveform at 10kV distribution tower grounding place to be assessed;

Data Analysis Services module, with described binary channels transient voltage waveform acquisition model calling, for drawing present percussion response curve according to the transient response voltage waveform collected;

Data memory module, with described Data Analysis Services model calling, for storing present percussion response curve and history shock response curve;

Calculation of correlation factor module, is connected with described data memory module, for calculating the related coefficient between present percussion response curve and history shock response curve;

State estimation module, be connected with described Calculation of correlation factor module and data memory module respectively, for the running status according to the related coefficient assessment 10kV distribution tower grounding place between present percussion response curve and history shock response curve, and the running status at 10kV distribution tower grounding place is stored into data memory module;

Client, described client comprises a data record platform, be connected with described dash current ripple generation module, binary channels transient voltage waveform acquisition module, Data Analysis Services module and data memory module respectively, for authorized user, the data in data memory module are inquired about and set the parameter of the dash current ripple of output, transient response voltage wave acquisition parameter and shock response curve rendering parameter, and show on the client.

Described data record platform comprise one respectively with the parameter typing unit of described dash current ripple generation module, binary channels transient voltage waveform acquisition module and Data Analysis Services model calling, described parameter typing unit is used for authorized personnel's typing dash current ripple output parameter, transient response voltage wave acquisition parameter and shock response curve rendering parameter.

Described data record platform also comprises a data query unit be connected with described data memory module, and described data query unit is used for authorized user to be inquired about the data stored in described data memory module.

Described client also comprises a function setting module, is connected with described data memory module, and described function setting module is used for needing to carry out function setting to described 10kV distribution shaft tower ground state evaluating system according to user.

A kind of 10kV distribution shaft tower ground state appraisal procedure, is characterized in, comprises following steps:

S1, dash current ripple generation module produce dash current ripple, and dash current ripple are put on 10kV distribution tower grounding place to be assessed;

The transient response voltage waveform at the 10kV distribution tower grounding place that S2, binary channels transient voltage waveform acquisition module acquires are to be assessed;

S3, Data Analysis Services module draw present percussion response curve according to the transient response voltage waveform collected;

S4, Calculation of correlation factor module calculate present percussion response curve and are stored in the related coefficient between the history shock response curve in data memory module;

S5, state estimation module are according to the running status at related coefficient assessment 10kV distribution tower grounding place;

The assessment result of the running status at S6, client display 10kV distribution tower grounding place.

Described dash current generation module is for generation of standard impulse current ripple and non-standard dash current ripple.

Described standard impulse current ripple is 8/20 μ s standard impulse current ripple.

Described non-standard dash current ripple is the one in 1/20 μ s, 4/10 μ s, the non-standard dash current ripple of 30/80 μ s.

In described step S3, the computing formula of present percussion response curve is:

$H_{impulse}^G\left(i\right)=FFT\left(U_{out\_G}\right(i)/FFT\left(U_{in\_G}\right(i)),i=1,2,\mathrm{\Λ},n$

Wherein, represent the shock response curve of 10kV distribution tower grounding; FFT represents that carrying out Fast Fourier Transform (FFT) to voltage waveform asks amplitude; U _{out_G}represent the transient state shock response voltage waveform sequence of 10kV distribution tower grounding, altogether n point, amplitude V; U _{in_G}represent the transient voltage wave sequence that the dash current ripple of 10kV distribution tower grounding input converts to, n point altogether, amplitude V.

In described step S4, Calculation of correlation factor step comprises:

Calculate present percussion response curve standard variance D _x;

Calculate history shock response curve standard variance D _y;

Calculate present percussion response curve with history shock response curve covariance C _xy;

Present percussion response curve with history shock response curve coefficient R _xyfor $R_{xy}=C_{x\mathrm{\ν}}/\sqrt{D_x{D}_y}.$

A kind of 10kV distribution shaft tower ground state evaluating system of the present invention and appraisal procedure compared with prior art have the following advantages: by the contrast between the shock response curve of history 10kV distribution tower grounding, under eliminating single-frequency, resistance value compares the uncertainty brought, can find 10kV distribution shaft tower earth conductor due to burn into fracture even steal cause whole ground state to occur change.

Accompanying drawing explanation

Fig. 1 is the one-piece construction schematic diagram of a kind of 10kV distribution of the present invention shaft tower ground state evaluating system;

Fig. 2 is the process flow diagram of a kind of 10kV distribution of the present invention shaft tower ground state appraisal procedure;

Fig. 3 is embody rule schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.

As shown in Figure 1, a kind of 10kV distribution shaft tower ground state evaluating system 100, comprises: dash current ripple generation module 101, for exporting dash current ripple, and dash current ripple is put on 10kV distribution tower grounding place to be assessed; Binary channels transient voltage waveform acquisition module 102, for gathering the transient response voltage waveform at 10kV distribution tower grounding place to be assessed; Data Analysis Services module 103, is connected with described binary channels transient voltage waveform acquisition module 102, for drawing present percussion response curve according to the transient response voltage waveform collected; Data memory module 104, is connected with described Data Analysis Services module 103, for storing present percussion response curve and history shock response curve; Calculation of correlation factor module 105, is connected with described data memory module 104, for calculating the related coefficient between present percussion response curve and history shock response curve; State estimation module 106, be connected with described Calculation of correlation factor module 105 and data memory module 104 respectively, for the running status according to the related coefficient assessment 10kV distribution tower grounding place between present percussion response curve and history shock response curve, and the running status at 10kV distribution tower grounding place is stored into data memory module 104; Client 107, described client 107 comprises a data record platform 1071, be connected with described dash current ripple generation module 101, binary channels transient voltage waveform acquisition module 102, Data Analysis Services module 103 and data memory module 104 respectively, for authorized user, the data in data memory module 104 are inquired about and set the parameter of the dash current ripple of output, transient response voltage wave acquisition parameter and shock response curve rendering parameter, and show in client 107.

In the present embodiment, described data record platform 1071 comprises a parameter typing unit 10711 be connected with described dash current ripple generation module 101, binary channels transient voltage waveform acquisition module 102 and Data Analysis Services module 103 respectively, and described parameter typing unit 10711 is for authorized personnel's typing dash current ripple output parameter, transient response voltage wave acquisition parameter and shock response curve rendering parameter.

In the present embodiment, described data record platform 1071 also comprises a data query unit 10712 be connected with described data memory module 104, and described data query unit 10712 is inquired about the data stored in described data memory module 104 for authorized user.

In the present embodiment, described client 107 also comprises a function setting module 1072, be connected with described data memory module 104, described function setting module 1072 is for needing to carry out function setting to described 10kV distribution shaft tower ground state evaluating system 100 according to user.

As shown in Figure 2, a kind of 10kV distribution shaft tower ground state appraisal procedure, comprises following steps:

S1, dash current ripple generation module 101 produce dash current ripple, and dash current ripple are put on 10kV distribution tower grounding place to be assessed.

As shown in Figure 3, determine 10kV distribution tower grounding place to be assessed, record shaft tower number, the down conductor 200 of 10kV distribution shaft tower and earthing device 300 are untied and are eliminated interference and avoid having an impact to the equipment on shaft tower by staff's tape insulation gloves, wherein, the dash current ripple generation module 101 of 10kV distribution shaft tower ground state evaluating system 100 is connected to earthing device 300 by dash current ripple output lead 400, earthing device part is embedded in ground less than 500, the testing current pole ground connection of dash current ripple generation module 101, the voltage tester pole ground connection of binary channels transient voltage waveform acquisition module 102, binary channels transient voltage waveform acquisition module 102 also connects Luo-coil 600 and earthing device 300 respectively, convert the dash current of output to transient voltage waveform by Luo-coil 600 to gather, gather the shock response voltage waveform of earthing device 300 simultaneously.

Preferably, described standard impulse current ripple is 8/20 μ s standard impulse current ripple, and described non-standard dash current ripple is the one in 1/20 μ s, 4/10 μ s, the non-standard dash current ripple of 30/80 μ s, and peak value size also can change in addition.

S2, binary channels transient voltage waveform acquisition module 102 gather the transient response voltage waveform at 10kV distribution tower grounding place to be assessed.

S3, Data Analysis Services module 103 draw present percussion response curve according to the transient response voltage waveform collected.

The computing formula of present percussion response curve is:

$H_{impulse}^G\left(i\right)=FFT\left(U_{out\_G}\right(i)/FFT\left(U_{in\_G}\right(i)),i=1,2,\mathrm{\Λ},n$

Wherein, represent the shock response curve of 10kV distribution tower grounding; FFT represents that carrying out Fast Fourier Transform (FFT) to voltage waveform asks amplitude; U _{out_G}represent the transient state shock response voltage waveform sequence of 10kV distribution tower grounding, altogether n point, amplitude V; U _{in_G}represent the transient voltage wave sequence that the dash current ripple of 10kV distribution tower grounding input converts to, n point altogether, amplitude V.

S4, Calculation of correlation factor module 105 calculate present percussion response curve and are stored in the related coefficient between the history shock response curve in data memory module 104.Wherein history shock response curve be the curve of average data for many years in database storage module or voluntarily selected first time test result shock response curve

Calculate present percussion response curve standard variance D _x,

Wherein, $D_x=\frac{1}{n}\underset{k=1}{\overset{n}{\Σ}}{\[H_{impulse}^{G\left(x\right)}\left(k\right)-\frac{1}{n}\underset{k=1}{\overset{n}{\Σ}}{H}_{impulse}^{G\left(x\right)}\left(k\right)\]}^2;$

Calculate history shock response curve standard variance D _y,

Wherein, $D_y=\frac{1}{n}\underset{k=1}{\overset{n}{\Σ}}{\[H_{impulse}^{G\left(y\right)}\left(k\right)-\frac{1}{n}\underset{k=1}{\overset{n}{\Σ}}{H}_{impulse}^{G\left(y\right)}\left(k\right)\]}^2;$

Calculate present percussion response curve with history shock response curve covariance C _xy,

$R_{xy}=C_{xy}/\sqrt{D_x{D}_y}.$

S5, state estimation module are according to the running status at related coefficient assessment 10kV distribution tower grounding place.

Particularly, related coefficient >=0.9, then represent that running status is normal; 0.9> related coefficient >=0.6, represents that ground connection place is by slight erosion; 0.6> related coefficient >=0.3, ground connection place is by heavy corrosion; Related coefficient <0.3, represents that ground connection place is by heavy corrosion or fracture, or stolenly to dig.

The assessment result of the running status at S6, client display 10kV distribution tower grounding place.

Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (10)

1. a 10kV distribution shaft tower ground state evaluating system, is characterized in that, comprise:

Dash current ripple generation module, for exporting dash current ripple, and puts on 10kV distribution tower grounding place to be assessed by dash current ripple;

Binary channels transient voltage waveform acquisition module, for gathering the transient response voltage waveform at 10kV distribution tower grounding place to be assessed;

Data Analysis Services module, with described binary channels transient voltage waveform acquisition model calling, for drawing present percussion response curve according to the transient response voltage waveform collected;

Data memory module, with described Data Analysis Services model calling, for storing present percussion response curve and history shock response curve;

Calculation of correlation factor module, is connected with described data memory module, for calculating the related coefficient between present percussion response curve and history shock response curve;

State estimation module, be connected with described Calculation of correlation factor module and data memory module respectively, for the running status according to the related coefficient assessment 10kV distribution tower grounding place between present percussion response curve and history shock response curve, and the running status at 10kV distribution tower grounding place is stored into data memory module;

Client, described client comprises a data record platform, be connected with described dash current ripple generation module, binary channels transient voltage waveform acquisition module, Data Analysis Services module and data memory module respectively, for authorized user, the data in data memory module are inquired about and set the parameter of the dash current ripple of output, transient response voltage wave acquisition parameter and shock response curve rendering parameter, and show on the client.

2. 10kV distribution shaft tower ground state evaluating system as claimed in claim 1, it is characterized in that, described data record platform comprise one respectively with the parameter typing unit of described dash current ripple generation module, binary channels transient voltage waveform acquisition module and Data Analysis Services model calling, described parameter typing unit is used for authorized personnel's typing dash current ripple output parameter, transient response voltage wave acquisition parameter and shock response curve rendering parameter.

3. 10kV distribution shaft tower ground state evaluating system as claimed in claim 1, it is characterized in that, described data record platform also comprises a data query unit be connected with described data memory module, and described data query unit is used for authorized user to be inquired about the data stored in described data memory module.

4. 10kV distribution shaft tower ground state evaluating system as claimed in claim 1, it is characterized in that, described client also comprises a function setting module, be connected with described data memory module, described function setting module is used for needing to carry out function setting to described 10kV distribution shaft tower ground state evaluating system according to user.

5. a 10kV distribution shaft tower ground state appraisal procedure, is characterized in that, comprise following steps:

S1, dash current ripple generation module produce dash current ripple, and dash current ripple are put on 10kV distribution tower grounding place to be assessed;

The transient response voltage waveform at the 10kV distribution tower grounding place that S2, binary channels transient voltage waveform acquisition module acquires are to be assessed;

S3, Data Analysis Services module draw present percussion response curve according to the transient response voltage waveform collected;

S4, Calculation of correlation factor module calculate present percussion response curve and are stored in the related coefficient between the history shock response curve in data memory module; ;

S5, state estimation module are according to the running status at related coefficient assessment 10kV distribution tower grounding place;

The assessment result of the running status at S6, client display 10kV distribution tower grounding place.

6. 10kV distribution shaft tower ground state appraisal procedure as claimed in claim 5, it is characterized in that, described dash current generation module is for generation of standard impulse current ripple and non-standard dash current ripple.

7. 10kV distribution shaft tower ground state appraisal procedure as claimed in claim 6, it is characterized in that, described standard impulse current ripple is 8/20 μ s standard impulse current ripple.

8. 10kV distribution shaft tower ground state appraisal procedure as claimed in claim 6, it is characterized in that, described non-standard dash current ripple is the one in 1/20 μ s, 4/10 μ s, the non-standard dash current ripple of 30/80 μ s.

9. 10kV distribution shaft tower ground state appraisal procedure as claimed in claim 5, it is characterized in that, in described step S3, the computing formula of present percussion response curve is:

$H_{impulse}^G\left(i\right)=FFT\left(U_{out\_G}\right(i)/FFT\left(U_{in\_G}\right(i)),i=1,2,\mathrm{\&Lambda;},n$

Wherein, represent the shock response curve of 10kV distribution tower grounding; FFT represents that carrying out Fast Fourier Transform (FFT) to voltage waveform asks amplitude; U _{out_G}represent the transient state shock response voltage waveform sequence of 10kV distribution tower grounding, altogether n point, amplitude V; U _{in_G}represent the transient voltage wave sequence that the dash current ripple of 10kV distribution tower grounding input converts to, n point altogether, amplitude V.

10. 10kV distribution shaft tower ground state appraisal procedure as claimed in claim 5, it is characterized in that, in described step S4, Calculation of correlation factor step comprises:

Calculate present percussion response curve standard variance D _x;

Calculate history shock response curve standard variance D _y;

Calculate present percussion response curve with history shock response curve covariance C _xy;

Present percussion response curve with history shock response curve coefficient R _xyfor $R_{xy}=C_{xy}/\sqrt{D_x{D}_y}.$