CN101504404A - Soil corrosivity evaluation method for substation grounding network in Guangdong area - Google Patents
Soil corrosivity evaluation method for substation grounding network in Guangdong area Download PDFInfo
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Abstract
The invention discloses a method for evaluating soil corrosivity of a grounding grid of a substation in Guangdong region, and relates to a method for evaluating the soil corrosivity. The method comprises the following steps: (1) picking up the soil on the buried depth position of the grounding grid to measure eight soil parameters(1) by conventional methods; (2) utilizing an eight index comprehensive grading method to determine a comprehensive grade(2); and (3) determining the grade of the soil corrosivity according to an eight index comprehensive grading result(3). The eight soil parameters include soil texture(1.1), soil pH value(1.2), soil electric resistivity(1.3), soil salt content(1.4), soil water content(1.5), corrosion potential(1.6), and soil C1<->+2SO4<2-> content (1.7). The method is not only used for evaluating the soil corrosivity environment caused by the grounding grid steel of the substation operated in Guangdong region and predicting the soil corrosivity environment caused by the grounding grid steel of a newly built substation, but also applied to evaluating the corrosive protection of the buried steel in other industries in Guangdong region.
Description
Technical field
The present invention relates to a kind of soil corrosivity evaluation method, relate in particular to a kind of soil corrosivity evaluation method for substation grounding network in Guangdong area.
Background technology
The netted earthing device that grounding net of transformer substation is made up of by methods such as welding band steel, round steel, angle steel etc., have with electric system link to each other, provide with the earth fault current and lightning current leakage path, stable potential, functions such as zero potential reference point are provided, be the important leverage of power system device safety and personal safety.The metal soil corrosion mainly belongs to galvanic corrosion, and corrosion galvanic cell is its most basic form.Grounded screen is in the underground abominable running environment for a long time, and the corrosion of soil is inevitable.China is subjected to the restriction of resource, techno-economic question, mainly adopts steel as the grounded screen material, and the steel usage quantity is huge.Various places grounding net of transformer substation corrosion investigation shows that the etching problem of grounded screen is quite outstanding, and area and environmental difference are very big.The requirement of the electric power system fault electric current of releasing should be satisfied in the cross section of grounded screen, comprises heat-staple requirement and moving stable requirement.Corrosion may cause the corrosion rust of the reducing of grounded screen steel product cross-sectional, joint disconnected etc., and it is bad to cause that easily grounded screen is electrically connected, the most serious in " lost territory " of causing transformer station's electrical equipment.Along with power system development, earth short circuit current constantly increases, and the safe reliability of grounded screen has been proposed very high requirement, in case the grounded screen accident that causes because of soil corrosion takes place, corresponding consequence is very serious, and similarly accident is of common occurrence in various places.
When China's power system transformer substation designs, more concern be whether stake resistance qualified, whether contact electricity and step voltage meet the demands etc., the operation maintenance rules generally require 5-10 that the grounded screen excavation is checked its corrosion condition of steel grounding body, mainly calculate average corrosion rate according to steel residuals weight and cross section, regularly the evaluation method of digging measure grounded screen steel average corrosion rate can be used to move the evaluation of grounding net of transformer substation material corrosion, can't instruct the corrosion protection design for newly-built transformer station because of generally lacking the corrosion of buried metal data.China's power industry standard DL/T 621-1997 " ground connection of alternating-current electric device " requires the anticorrosion design of earthing device to design by the corrosion data of locality, but does not propose concrete evaluation method and corrosion data obtaining value method.China power industry standard DL/T 5394-2007 " the underground metal structures of power engineering aseptic technic guide rule " is with reference to the oil and gas industry standard, propose to adopt the corrosion electric current density of metal material in soil and the method for average corrosion rate judgement corrosion class of detecting, soil corrosivity for general area mainly adopts soil resistivity as evaluation criterion, is aided with oxidation-reduction potential and pH value.The corrosion electric current density of metal material in soil measured to be needed just can obtain metastable data for a long time, also lacks reliable surveying instrument at present.Average corrosion rate buries the sheet method oversize widespread usage that is not suitable for measuring period by the scene.Adopt soil resistivity to judge for the soil corrosivity in general area and should be primarily aimed at initial soil, and grounding net of transformer substation is backfill soil substantially, has a lot of examples to show that soil resistivity and soil corrosivity do not have direct corresponding relation at present.
The applicant shows the great amount of samples data analysis of 21 grounding net of transformer substation and soil in the area, Guangdong, soil resistivity, water cut, pH, unit weight, total porosity, void fraction, electric potential gradient (stray current), oxidation-reduction potential, corrosion potential, salt content, conductivity and these soil corrosion factors of various ion component can influence the soil metal erosion, also have reciprocation between them.Under the situation of not considering other Among Corrosive Factors, there is not simple funtcional relationship between each Among Corrosive Factors and the earth mat corrosivity, the neither one edphic factor can determine the corrosivity of soil separately, only an index can't be predicted soil corrosivity.If think only soil corrosivity to be judged by an index, misjudgment phenomenon appears through regular meeting, must consider the reciprocation of multiple factor.
There is the researcher also to propose abroad based on single factor or more multifactorial soil corrosivity grade scale, grade scale that obtains and disunity, foremost is according to the German Baeckman comprehensive grading system of relevant 12 soil properties with corrosion with situation foundation.The applicant shows according in the area, Guangdong 24 grounding net of transformer substation and soil data being tested to German Baeckman comprehensive grading index accuracy, it is very undesirable to adopt German Baeckman comprehensive grading method to estimate area, Guangdong grounded screen soil corrosivity result, this method is not suitable for the soil corrosivity assessment of area, Guangdong, this standard Consideration is too much simultaneously, it is complete to be difficult to collection in actual applications, and the measurement of the factor that has is inconvenience also.
What studies show that of applicant adopted soil corrosion and single soil parameters does not exist tangible funtcional relationship or classification range, the corrosion of grounded screen is the multifactor coefficient result of soil, it is very necessary setting up the soil corrosivity evaluation method of suiting measures to local conditions according to the each department soil characteristic, also is not fit to the appraisal procedure of substation grounding network in Guangdong area soil corrosivity at present.
Summary of the invention
Purpose of the present invention just is to overcome the shortcoming that present various soil corrosion assessment technology exists, transformer station's etching problem lacks the deficiency of appropriate evaluation method according to Guangdong regional power system development is very rapid, proposes a kind of simple, accurate, soil corrosivity evaluation method for substation grounding network in Guangdong area of making things convenient for field conduct.
Specifically, the present invention includes the following step:
1. the soil of getting buried depth position, grounded screen place carries out eight kinds of soil parameters according to conventional method and measures;
2. according to above-mentioned eight kinds of soil parameters measurement results, utilize substation grounding network in Guangdong area soil corrosivity eight index comprehensive methods of marking to determine the scoring of eight index comprehensives;
3. determine the soil corrosivity grade according to eight index comprehensive appraisal result;
Described eight kinds of soil parameters are:
The soil texture;
Soil pH value;
Soil resistivity;
Soil salt content;
Soil moisture content;
Corrosion potential;
Soil Cl
-+ 2SO
4 21Content.
The present invention shows that to the contrast of 21 transformer station's 80 sample soil corrosivities evaluation results in area, Guangdong and the actual Corrosion results of grounded screen the prediction of overall accuracy is 89.3%, satisfies application request.
The present invention has following advantage and good effect:
1. can realize evaluation not having a power failure and do not intercept under the situation of grounded screen steel measurement by soil parameters, determine the corrosion class of grounded screen steel, to check the grounded screen steel product cross-sectional to operation grounding net of transformer substation corrosion of steel environment;
2. can when new substation site selection, predict new grounding net of transformer substation corrosion of steel environment by the measurement of soil parameters, the corrosion class of prediction grounded screen steel is selected suitable steel product cross-sectional for use and is adopted suitable anticorrosive measure with suiting measures to local conditions with correct design;
3. have simple to operate, predictablity rate is high, make things convenient for the advantage of field conduct;
4. the present invention not only can be used for the prediction that the area, Guangdong is moved the evaluation of grounding net of transformer substation steel soil corrosion environment and can be used for the newly-built grounding net of transformer substation steel soil corrosion environment in area, Guangdong, also can bury the corrosion protection evaluation application of ground steel in area, Guangdong other industry.
Description of drawings
Fig. 1 is a soil corrosivity evaluation method for substation grounding network in Guangdong area FB(flow block) of the present invention;
Fig. 2 is a soil corrosivity evaluation method for substation grounding network in Guangdong area detailed process block diagram of the present invention.
Wherein:
1-eight kinds of soil parameters are measured,
1.1-the soil texture,
1.2-soil pH value,
1.3-soil resistivity,
1.4-soil salt content,
1.5-soil moisture content,
1.6-corrosion potential,
1.7-soil Cl
-+ 2SO
4 2-Content;
The scoring of 2-eight index comprehensives;
3-soil corrosivity grade.
Embodiment
One, below in conjunction with Fig. 1, Fig. 2 eight kinds of soil parameters being measured 1 is elaborated:
1, the soil texture 1.1
The soil texture 1.1 classification comprises sand, the sand silt, and silt or silty loam, clay loam and clay be totally five classes, and eight index comprehensives are marked, and this index scoring is called Z1 in 2 methods, and mark is respectively-6, and-4,0,4 and 6.
2, soil pH value 1.2
Soil pH value 1.2 numerical ranges comprise〉8.5,7.0 and≤8.5,5.5 and≤7.0,4.5 and≤5.5 and≤4.5 totally five classes, eight index comprehensives are marked, and this index scoring is called Z2 in 2 methods, mark is respectively-4 ,-2,0,2 and 4.
3, soil resistivity 1.3
Soil resistivity 1.3 numerical ranges comprise〉50 Ω .m, 20 and≤50 Ω .m and≤20 Ω .m totally three classes, this index scoring is called Z3 in eight index comprehensives scoring (2) method, mark is respectively-2,0 and 2.
4, soil salt content 1.4
Soil salt content 1.4 numerical ranges comprise＜0.01%, 〉=0.01% and＜0.05%, 〉=0.05 and＜0.1%, 〉=0.1% and＜0.75% and 〉=0.75% totally five classes, eight index comprehensives are marked, and this index scoring is called Z4 in 2 methods, mark is respectively-5,-3,0,3 and 5.
5, soil moisture content 1.5
Soil moisture content 1.5 numerical ranges comprise＜3%, 〉=3% and＜7% or 〉=40%, 〉=7% and＜10% or 〉=30% and＜40%, 〉=10% and＜12% or 〉=25% and＜30% and 〉=12% and＜25% totally five classes, eight index comprehensives are marked, and this index scoring is called Z5 in 2 methods, and mark is respectively-5 ,-3,0,3 and 5.
6, corrosion potential 1.6
Corrosion potential 1.6 numerical ranges comprise 〉-0.15V ,≤-0.15V and-0.3V ,≤-0.3V and-0.45V, ≤-0.45V and-0.55V and≤-0.55V totally five classes, eight index comprehensives are marked, and this index scoring is called Z6 in 2 methods, mark is respectively-2,-1,0,1 and 2.
7, soil Cl
-+ 2SO
4 2-Content 1.7
Soil Cl
-+ 2SO
4 2-Content 1.7 numerical ranges comprise＜3mmol/kg, 〉=3mmol/kg and＜10mmol/kg, 〉=10mmol/kg and＜30mmol/kg, 〉=30mmol/kg and＜100mmol/kg and 〉=five classes such as 100mmol/kg, this index scoring is called Z7 in eight index comprehensives scoring (2) method, and mark is respectively-2 ,-1,0,1 and 2.
Substation grounding network in Guangdong area soil corrosivity eight index comprehensive methods of marking see Table 1.
Table 1 substation grounding network in Guangdong area soil corrosivity eight index comprehensive methods of marking
Two, concrete appraisal procedure
1, the scoring of eight index comprehensives 2
According to the eight index comprehensive methods of marking of the substation grounding network in Guangdong area soil corrosivity shown in the table 1, determine eight index comprehensives scoring 2, appraisal result is by Z1, Z2, Z3, Z4, Z5, Z6 and Z7 addition form, and are divided into five scopes, be respectively 〉=10, 〉=7 and＜10, 〉=0 and＜6, 〉=-8 and＜-1 and＜-8, see Table 2;
2, the soil corrosivity grade 3
Table 2 substation grounding network in Guangdong area soil corrosivity eight index evaluation method corrosion class evaluation tables
After utilization the present invention assesses and determines operation grounding net of transformer substation soil corrosivity grade, can determine operation grounding net of transformer substation remaining cross-section according to the time limit and corrosion of steel speed that transformer station has moved, and then further whether check satisfies the requirement of dynamic and thermal effect cross section.Utilization the present invention can determine new grounding net of transformer substation cross section according to transformer station's design period and corrosion of steel speed after assessing and determining new grounding net of transformer substation soil corrosivity grade, and then further whether check satisfies the requirement of dynamic and thermal effect cross section.
Claims (10)
1, soil corrosivity evaluation method for substation grounding network in Guangdong area is characterized in that comprising the following steps:
1. the soil of getting buried depth position, grounded screen place carries out eight kinds of soil parameters according to conventional method and measures (1);
2. according to above-mentioned eight kinds of soil parameters measurement results, utilize substation grounding network in Guangdong area soil corrosivity eight index comprehensive methods of marking to determine eight index comprehensives scorings (2);
3. determine soil corrosivity grade (3) according to eight index comprehensive appraisal result;
Described eight kinds of soil parameters are:
The soil texture (1.1);
Soil pH value (1.2);
Soil resistivity (1.3);
Soil salt content (1.4);
Soil moisture content (1.5);
Corrosion potential (1.6);
Soil Cl
-+ 2SO
4 2-Content (1.7).
2, appraisal procedure as claimed in claim 1 is characterized in that:
The described soil texture (1.1) comprises sand, the sand silt, and silt or silty loam, clay loam and clay be totally five classes, and this index scoring is called Z1 in eight index comprehensives scoring (2) method, and mark is respectively-6, and-4,0,4 and 6.
3, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil pH value (1.2) numerical range comprises〉8.5,7.0 and≤8.5,5.5 and≤7.0,4.5 and≤5.5 and≤4.5 totally five classes, this index scoring is called Z2 in eight index comprehensives scoring (2) method, mark is respectively-4 ,-2,0,2 and 4.
4, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil resistivity (1.3) numerical range comprises〉50 Ω .m, 20 and≤50 Ω .m and≤20 Ω .m totally three classes, this index scoring is called Z3 in eight index comprehensives scoring (2) method, mark is respectively-2,0 and 2.
5, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil salt content (1.4) numerical range comprises＜0.01%, 〉=0.01% and＜0.05%, 〉=0.05 and＜0.1%, 〉=0.1% and＜0.75% and 〉=0.75% totally five classes, this index scoring is called Z4 in eight index comprehensives scoring (2) method, mark is respectively-5,-3,0,3 and 5.
6, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil moisture content (1.5) numerical range comprises＜3%, 〉=3% and＜7% or 〉=40%, 〉=7% and＜10% or 〉=30% and＜40%, 〉=10% and＜12% or 〉=25% and＜30% and 〉=12% and＜25% totally five classes, this index scoring is called Z5 in eight index comprehensives scoring (2) method, and mark is respectively-5 ,-3,0,3 and 5.
7, appraisal procedure as claimed in claim 1 is characterized in that:
Described corrosion potential (1.6) numerical range comprises 〉-0.15V ,≤-0.15V and-0.3V ,≤-0.3V and-0.45V, ≤-0.45V and-0.55V and≤-0.55V totally five classes, this index scoring is called Z6 in eight index comprehensives scoring (2) method, mark is respectively-2,-1,0,1 and 2.
8, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil Cl
-+ 2SO
4 2-Content (1.7) numerical range comprises＜3mmol/kg, 〉=3mmol/kg and＜10mmol/kg, 〉=10mmol/kg and＜30mmol/kg, 〉=30mmol/kg and＜100mmol/kg and 〉=five classes such as 100mmol/kg, this index scoring is called Z7 in eight index comprehensives scoring (2) method, and mark is respectively-2 ,-1,0,1 and 2.
9, appraisal procedure as claimed in claim 1 is characterized in that:
(2) result is by Z1 for the scoring of described eight index comprehensives, Z2, Z3, Z4, Z5, Z6 and Z7 addition form, and are divided into five scopes, be respectively 〉=10, 〉=7 and＜10, 〉=0 and＜6, 〉=-8 and＜-1 and＜-8.
10, appraisal procedure as claimed in claim 1 is characterized in that:
Described soil corrosivity grade (3) is divided into Pyatyi, is respectively I, II, and III, IV and V level, the corrosion of steel speed of matching convention regulation is respectively＜1g/dm
2A, 〉=1g/dm
2A and＜3g/dm
2A, 〉=3g/dm
2A and＜5g/dm
2A, 〉=5g/dm
2A and＜7g/dm
2A and 〉=7g/dm
2A, comprehensive grading numerical value 〉=10 of eight index comprehensives scoring (2), 〉=7 and＜10, 〉=0 and＜6, 〉=-8 and＜-1 and＜-8 I, II, III, IV and the V levels of corresponding soil corrosivity grades (3) respectively.
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