CN103698477B - Visual monitoring method and system for concentration of SF6 gas in GIS (gas insulated substation) chamber - Google Patents

Abstract

The invention provides a visual monitoring method for concentration of SF6 gas in a GIS (gas insulated substation) chamber. The method comprises the following steps: collecting the SF6 gas concentration through multiple groups of preset monitoring sites in the GIS chamber, wherein each group includes eight monitoring sites, and the eight monitoring sites in each group form a cubic monitoring region; calculating each cubic SF6 gas concentration distribution field according to the SF6 gas concentration of each monitoring site; expanding each cubic SF6 gas concentration distribution field to fill the whole GIS chamber so as to obtain the SF6 gas concentration distribution field of the GIS chamber; monitoring the concentration of SF6 gas in the GIS chamber according to the concentration distribution field of SF6 gas in the GIS chamber. The invention further provides a visual monitoring system which can be used for comprehensively monitoring the concentration of SF6 gas in the whole GIS chamber and is high in accuracy.

Description

GIS room SF6 gas concentration visualizing monitor method and system

Technical field

The present invention relates to SF6 gas detection technology field, particularly relate to a kind of GIS room SF6 gas concentration visualizing monitor method, and a kind of GIS room SF6 gas concentration visualizing monitor system.

Background technology

SF6 gas self is a kind of gas of excellent insulation performance, 3 times of its breakdown field strength the chances are air, and its arc extinction performance is excellent simultaneously, and therefore in GIS, equipment adopts SF6 gas to insulate in a large number.Because the leakage of SF6 will reduce the insulating property of GIS greatly in GIS, jeopardize the reliability of equipment; SF6 gas is under the effect of high-voltage arc in addition, will decompose, and produces toxic gas, and also procreative noxious material after SF6 gas contacts with water, by the health of human body of entail dangers to operation maintenance personnel.

Traditional detects the general method detectable concentration adopting ground Passive diffusion based on SF6 gas concentration, detects ground single-point concentration.Although SF6 is heavier than air, except spreading downwards, also can be formed and spread towards periphery, and according to the phenomenon of landform climbing, so conventional art can not the SF6 Gas concentration distribution of perfect representation GIS room, its testing result is comprehensive, and accuracy is lower.

Summary of the invention

Based on this, the invention provides a kind of GIS room SF6 gas concentration visualizing monitor method and system, the SF6 gas concentration of the energy whole GIS room of overall monitor, degree of accuracy is higher.

A kind of GIS room SF6 gas concentration visualizing monitor method, comprises the steps:

Multiple monitoring points of being preset by GIS indoor gather SF6 gas concentration, and wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

According to the SF6 gas concentration of each monitoring point, calculate cubical SF6 Gas concentration distribution field described in each;

Expansion is carried out in SF6 Gas concentration distribution field cubical described in each and is filled into whole GIS room, obtain the SF6 Gas concentration distribution field of GIS room;

According to the SF6 Gas concentration distribution field of described GIS room, the SF6 gas concentration of GIS room is monitored.

A kind of GIS room SF6 gas concentration visualizing monitor system, comprising:

Acquisition module, gather SF6 gas concentration for multiple monitoring points of being preset by GIS indoor, wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

Computing module, for the SF6 gas concentration according to each monitoring point, calculates cubical SF6 Gas concentration distribution field described in each;

Expansion module, is filled into whole GIS room for expansion is carried out in SF6 Gas concentration distribution field cubical described in each, obtains the SF6 Gas concentration distribution field of GIS room;

Monitoring modular, for the SF6 Gas concentration distribution field according to described GIS room, monitors the SF6 gas concentration of GIS room.

Above-mentioned GIS room SF6 gas concentration visualizing monitor method and system, the SF6 gas-monitoring point that the present invention arranges according to GIS room solid forms multiple cube monitored area, gather GIS indoor gas concentration, according to three dimensional fluid mechanical model (CFD) the method simulation three-dimensional non-steady state turbulent flow process of heavy gas dispersion and the boundary condition of setting, each cubical SF6 Gas concentration distribution field can be calculated, finally expansion is carried out in each cubical SF6 Gas concentration distribution field and be filled into whole GIS room, form overall SF6 Gas concentration distribution field; Accuracy of detection of the present invention is high, achieves the SF6 Gas concentration distribution of stereo display GIS indoor, improves the monitoring level of GIS room overall region.

Accompanying drawing explanation

Fig. 1 is GIS room SF6 gas concentration visualizing monitor method of the present invention schematic flow sheet in one embodiment.

Fig. 2 is the schematic diagram of cube and monitoring point in Fig. 1.

Fig. 3 is GIS room SF6 gas concentration visualizing monitor system of the present invention structural representation in one embodiment.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.

As shown in Figure 1, be the schematic flow sheet of a kind of GIS room of the present invention SF6 gas concentration visualizing monitor method, comprise the steps:

S11, the multiple monitoring points collection SF6 gas concentrations preset by GIS indoor, wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

As shown in Figure 2, be the schematic diagram of cube and monitoring point, each monitoring point is cubical summit, and every 8 monitoring points form a cube; Cubical number and setting position can be preset by professional, and cubical number is more, and the result of detection can be more accurate;

Wherein, the ground that cube is preferably GIS indoor evenly arranges 4, and because SF6 gas density is large compared with air, SF6 gas more can be deposited on GIS flooring, therefore need need at least arrange 4 on the ground of GIS indoor, meet the needs of accuracy of detection;

The plane that distance GIS flooring is 1 meter need at least arrange 4; Up the concentration of height SF6 gas is general lower again, and visual actual conditions are arranged.

S12, SF6 gas concentration according to each monitoring point, calculate cubical SF6 Gas concentration distribution field described in each;

S13, expansion is carried out in SF6 Gas concentration distribution field cubical described in each be filled into whole GIS room, obtain the SF6 Gas concentration distribution field of GIS room;

According to each cube apex place, namely form the SF6 gas concentration that cubical 8 monitoring points collect, calculate this cubical SF6 Gas concentration distribution field.

In a preferred embodiment, particularly, to form the SF6 gas concentration value of described cubical 8 monitoring points for boundary condition, the basal conservation eqution according to presetting calculates cubical three dimensional fluid mechanical model, obtains described cubical CONCENTRATION DISTRIBUTION field;

SF6 gas is relative to air, its proportion is heavier, according to the three-dimensional non-steady state turbulent flow process of CFD method simulation heavy gas dispersion, approximate treatment can go out data in cube, data outside cube calculate basis, external condition is set to 0, calculates according to same cubical mode, can in the hope of the SF6 gas concentration of Zone Full in GIS room by expansion.

Wherein, basal conservation eqution can comprise:

Can continuity equation be drawn by law of conservation of mass:

$\frac{\∂\mathrm{\ρ}}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_j\right)=0$

Wherein, ρ is the mass density of gas, u _jfor X _jgas velocity vectors on axle.

Can draw the momentum conservation equation on x, y, z three directions by the law of conservation of momentum, general formula is:

$\frac{\∂\left(\mathrm{\ρ}{u}_i\right)}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_i{u}_j\right)=-\frac{\∂\mathrm{\ρ}}{\∂x_i}+\frac{\∂}{\∂x_j}\left({\mathrm{\μ}}_t\frac{\∂u_i}{\∂x_j}\right)+\frac{\∂}{\∂x_j}\left({\mathrm{\μ}}_t\frac{\∂u_j}{\∂x_i}\right)+(\mathrm{\ρ}-{\mathrm{\ρ}}_a)g_i$

Wherein, ρ _afor the mass density of air, μ _tfor gas viscosity.

Can energy conservation equation be drawn by law of conservation of energy:

$\frac{\∂\left(\mathrm{\ρT}\right)}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_{j}T\right)=\frac{1}{C_p}\frac{\∂}{\∂x_j}\left(k_t\frac{\∂T}{\∂x_j}\right)+\frac{C_{{\mathrm{\ρ}}_{\mathrm{\β}}}-C_{P_{\mathrm{\α}}}}{C_p}\left[\left(\frac{u_i}{{\mathrm{\δ}}_c}\right)\frac{\∂\mathrm{\ω}}{\∂x_j}\right]\frac{\∂T}{\∂x_j}$

Wherein C _p, δ _cfor constant, can arrange as follows in the present embodiment:

C _p＝1.0， $C_{p_{\mathrm{\β}}}=1.44,$ $C_{P_{\mathrm{\α}}}=1.33,$ δ _c＝1.3。

According to above formula, when calculating cubical CFD model, boundary condition is set to the gas concentration of monitoring point, when promoting cube model, using the calculated value of concentration point as boundary condition, until boundary condition is the calculating of 0.

S14, SF6 Gas concentration distribution field according to described GIS room, monitor the SF6 gas concentration of GIS room;

Obtain the SF6 Gas concentration distribution field of GIS indoor, achieve the SF6 gas concentration of on-line real time monitoring GIS indoor, the sampling period of each monitoring point only need be set, just can realize continuing to monitor.

In a preferred embodiment, also step can be comprised:

Layering is carried out by default layer height in the CONCENTRATION DISTRIBUTION field of GIS room, generates the layering concentration profile of GIS room SF6 gas;

According to the every layer height selected, form the SF6 concentration profile of every layer, can the distribution of each layer concentration of Circulating fibrocytes, also the SF6 Gas concentration distribution figure showing each layer can be selected, the displaying number of plies of every layer height and GIS room can be selected according to user, make the concentration profile of SF6 more targeted.

Further, also step can be comprised:

According to the rgb color value preset and the corresponding relation in gas concentration value interval, color rendering is carried out in the SF6 Gas concentration distribution field of GIS room;

In this step, gas concentration value interval is set, each interval is arranged corresponding rgb color value, adopt rgb color Layering manifestation SF6 gas concentration, make the display of the SF6 Gas concentration distribution field of GIS room more directly perceived, be more conducive to monitoring.

As shown in Figure 3, the present invention also provides a kind of GIS room SF6 gas concentration visualizing monitor system, comprising:

Acquisition module 31, gather SF6 gas concentration for multiple monitoring points of being preset by GIS indoor, wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

As shown in Figure 2, be the schematic diagram of cube and monitoring point, each monitoring point is cubical summit, and every 8 monitoring points form a cube; Cubical number and setting position can be preset by professional, and cubical number is more, and the result of detection can be more accurate;

Wherein, the ground that cube is preferably GIS indoor evenly arranges 4, and because SF6 gas density is large compared with air, SF6 gas more can be deposited on GIS flooring, therefore need need at least arrange 4 on the ground of GIS indoor, meet the needs of accuracy of detection;

The plane that distance GIS flooring is 1 meter need at least arrange 4; Up the concentration of height SF6 gas is general lower again, and visual actual conditions are arranged.

Computing module 32, for the SF6 gas concentration according to each monitoring point, calculates cubical SF6 Gas concentration distribution field described in each;

Expansion module 33, is filled into whole GIS room for expansion is carried out in SF6 Gas concentration distribution field cubical described in each, obtains the SF6 Gas concentration distribution field of GIS room;

According to each cube apex place, namely form the SF6 gas concentration that cubical 8 monitoring points collect, calculate this cubical SF6 Gas concentration distribution field.

In a preferred embodiment, described computing module also for: to form the SF6 gas concentration value of described cubical 8 monitoring points for boundary condition, basal conservation eqution according to presetting calculates cubical three dimensional fluid mechanical model, obtains described cubical CONCENTRATION DISTRIBUTION field;

SF6 gas is relative to air, its proportion is heavier, according to the three-dimensional non-steady state turbulent flow process of CFD method simulation heavy gas dispersion, approximate treatment can go out data in cube, data outside cube calculate basis, external condition is set to 0, calculates according to same cubical mode, can in the hope of the SF6 gas concentration of Zone Full in GIS room by expansion.

Wherein, basal conservation eqution can comprise:

Can continuity equation be drawn by law of conservation of mass:

$\frac{\∂\mathrm{\ρ}}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_j\right)=0$

Wherein, ρ is the mass density of gas, u _jfor X _jgas velocity vectors on axle.

Can draw the momentum conservation equation on x, y, z three directions by the law of conservation of momentum, general formula is:

$\frac{\∂\left(\mathrm{\ρ}{u}_i\right)}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_i{u}_j\right)=-\frac{\∂\mathrm{\ρ}}{\∂x_i}+\frac{\∂}{\∂x_j}\left({\mathrm{\μ}}_t\frac{\∂u_i}{\∂x_j}\right)+\frac{\∂}{\∂x_j}\left({\mathrm{\μ}}_t\frac{\∂u_j}{\∂x_i}\right)+(\mathrm{\ρ}-{\mathrm{\ρ}}_a)g_i$

Wherein, ρ _afor the mass density of air, μ _tfor gas viscosity.

Can energy conservation equation be drawn by law of conservation of energy:

$\frac{\∂\left(\mathrm{\ρT}\right)}{\∂t}+\frac{\∂}{\∂x_j}\left(\mathrm{\ρ}{u}_{j}T\right)=\frac{1}{C_p}\frac{\∂}{\∂x_j}\left(k_t\frac{\∂T}{\∂x_j}\right)+\frac{C_{{\mathrm{\ρ}}_{\mathrm{\β}}}-C_{P_{\mathrm{\α}}}}{C_p}\left[\left(\frac{u_i}{{\mathrm{\δ}}_c}\right)\frac{\∂\mathrm{\ω}}{\∂x_j}\right]\frac{\∂T}{\∂x_j}$

Wherein C _p, δ _cfor constant, can arrange as follows in the present embodiment:

C _p＝1.0， $C_{p_{\mathrm{\β}}}=1.44,$ $C_{P_{\mathrm{\α}}}=1.33,$ δ _c＝1.3。

According to above formula, when calculating cubical CFD model, boundary condition is set to the gas concentration of monitoring point, when promoting cube model, using the calculated value of concentration point as boundary condition, until boundary condition is the calculating of 0.

Monitoring modular 34, for the SF6 Gas concentration distribution field according to described GIS room, monitors the SF6 gas concentration of GIS room.

Obtain the SF6 Gas concentration distribution field of GIS indoor, achieve the SF6 gas concentration of on-line real time monitoring GIS indoor, the sampling period of each monitoring point only need be set, just can realize continuing to monitor.

In a preferred embodiment, also can hierarchical block be comprised, for:

Layering is carried out by default layer height in the CONCENTRATION DISTRIBUTION field of GIS room, generates the layering concentration profile of GIS room SF6 gas;

According to the every layer height selected, form the SF6 concentration profile of every layer, can the distribution of each layer concentration of Circulating fibrocytes, also the SF6 Gas concentration distribution figure showing each layer can be selected, the displaying number of plies of every layer height and GIS room can be selected according to user, make the concentration profile of SF6 more targeted.

Further, also can rendering module be comprised, for:

According to the rgb color value preset and the corresponding relation in gas concentration value interval, color rendering is carried out in the SF6 Gas concentration distribution field of GIS room;

In this module, gas concentration value interval is set, each interval is arranged corresponding rgb color value, adopt rgb color Layering manifestation SF6 gas concentration, make the display of the SF6 Gas concentration distribution field of GIS room more directly perceived, be more conducive to monitoring.

GIS room of the present invention SF6 gas concentration visualizing monitor method and system, the SF6 gas-monitoring point that the present invention arranges according to GIS room solid forms multiple cube monitored area, gather GIS indoor gas concentration, according to three dimensional fluid mechanical model (CFD) the method simulation three-dimensional non-steady state turbulent flow process of heavy gas dispersion and the boundary condition of setting, each cubical SF6 Gas concentration distribution field can be calculated, finally expansion is carried out in each cubical SF6 Gas concentration distribution field and be filled into whole GIS room, form overall SF6 Gas concentration distribution field; Accuracy of detection of the present invention is high, achieves the SF6 Gas concentration distribution of stereo display GIS indoor, improves the monitoring level of GIS room overall region.

The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (8)

1. a GIS room SF6 gas concentration visualizing monitor method, is characterized in that, comprise the steps:

Multiple monitoring points of being preset by GIS indoor gather SF6 gas concentration, and wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

According to the SF6 gas concentration of each monitoring point, calculate cubical SF6 Gas concentration distribution field described in each;

Expansion is carried out in SF6 Gas concentration distribution field cubical described in each and is filled into whole GIS room, obtain the SF6 Gas concentration distribution field of GIS room;

According to the SF6 Gas concentration distribution field of described GIS room, the SF6 gas concentration of GIS room is monitored.

2. GIS room according to claim 1 SF6 gas concentration visualizing monitor method, it is characterized in that, the described SF6 gas concentration according to each monitoring point, the step calculating the CONCENTRATION DISTRIBUTION field of cubical SF6 described in each is:

To form the SF6 gas concentration value of described cubical 8 monitoring points for boundary condition, the basal conservation eqution according to presetting calculates cubical three dimensional fluid mechanical model, obtains described cubical CONCENTRATION DISTRIBUTION field.

3. GIS room according to claim 2 SF6 gas concentration visualizing monitor method, is characterized in that, also comprise step:

Layering is carried out by default layer height in the CONCENTRATION DISTRIBUTION field of GIS room, generates the layering concentration profile of GIS room SF6 gas.

4. GIS room according to claim 1 SF6 gas concentration visualizing monitor method, is characterized in that, also comprise step:

According to the rgb color value preset and the corresponding relation in gas concentration value interval, color rendering is carried out in the SF6 Gas concentration distribution field of GIS room.

5. a GIS room SF6 gas concentration visualizing monitor system, is characterized in that, comprising:

Acquisition module, gather SF6 gas concentration for multiple monitoring points of being preset by GIS indoor, wherein, described monitoring point has many groups, and often organize 8,8 the described monitoring points often organized form a cube monitored area;

Computing module, for the SF6 gas concentration according to each monitoring point, calculates cubical SF6 Gas concentration distribution field described in each;

Expansion module, is filled into whole GIS room for expansion is carried out in SF6 Gas concentration distribution field cubical described in each, obtains the SF6 Gas concentration distribution field of GIS room;

Monitoring modular, for the SF6 Gas concentration distribution field according to described GIS room, monitors the SF6 gas concentration of GIS room.

6. GIS room according to claim 5 SF6 gas concentration visualizing monitor system, is characterized in that, described computing module also for:

To form the SF6 gas concentration value of described cubical 8 monitoring points for boundary condition, the basal conservation eqution according to presetting calculates cubical three dimensional fluid mechanical model, obtains described cubical CONCENTRATION DISTRIBUTION field.

7. GIS room according to claim 5 SF6 gas concentration visualizing monitor system, is characterized in that, also comprise hierarchical block, for layering is carried out by default layer height in the CONCENTRATION DISTRIBUTION field of GIS room, generates the layering concentration profile of GIS room SF6 gas.

8. GIS room according to claim 5 SF6 gas concentration visualizing monitor system, it is characterized in that, also comprise rendering module, for the corresponding relation according to the rgb color value preset and gas concentration value interval, color rendering is carried out in the SF6 Gas concentration distribution field of GIS room.