CN103063564A - Comprehensive evaluation method of erosion condition of electric transmission and transformation equipment earthing material - Google Patents
Comprehensive evaluation method of erosion condition of electric transmission and transformation equipment earthing material Download PDFInfo
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- CN103063564A CN103063564A CN 201310013634 CN201310013634A CN103063564A CN 103063564 A CN103063564 A CN 103063564A CN 201310013634 CN201310013634 CN 201310013634 CN 201310013634 A CN201310013634 A CN 201310013634A CN 103063564 A CN103063564 A CN 103063564A
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Abstract
The invention discloses a comprehensive evaluation method of erosion condition of an electric transmission and transformation equipment earthing material. According to the comprehensive evaluation method, when the pH value of soil in which an earthing device is buried is less than 6.8, the erosion degree of an earthing material is large; when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is greater than or equal to 35%, the erosion degree of the earthing material is small; and when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is less than 35%, and soil resistivity, reduction-oxidation potential, material corrosion potential, chloride ion content and sulfate radical content of soil in which earthing materials is buried are researched. The evaluation method provided by the invention is an on-site testing method of erosion resistance of an earthing material, a test person can know the corrosion condition of the earthing material in a short time when the test person carries a simple analytical apparatus, the evaluation method is simple and practical, and the test result is exact.
Description
One, technical field
The present invention relates to the corrosion evaluation method of buried metal member, specifically a kind of corrosion evaluation method of power transmission and transforming equipment earthing device.The method has been set up a cover power transmission and transforming equipment earthing device health status integrated evaluating method according to chlorion, sulfate radical in the soil resistivity at the power transmission and transforming equipment earthing device place of burying underground, soil redox potential, metallic material corrosion current potential, the soil.Be applicable to the corrosion evaluation of power transmission and transforming equipment earthing device, and the present invention can also carry out comprehensive evaluation to the corrosion condition of buried metal member.
Two, background technology
The power transmission and transforming equipment earthing device is the unification of working earthing, protective ground and lightning protection, is the critical facility of guaranteeing the person, equipment, system and power transmission and transforming equipment safe operation.Although power transmission and transforming equipment earthing device shared ratio in the whole investment of power transmission and transforming equipment is little, its effect can not be neglected.If earth fault when large earth short circuit current appears in system, just may occur in the design of grounding off-capacity or corrosion cracking, cause power grid accident, even the safety of harm equipment and the person.
At present, in the design, the material corrosion parameter that the selection Main Basis electric property of China's power transmission and transforming equipment earthing device material and design manual provide is carried out, and specific aim is poor, with certain blindness.If blindly the choosing of selection material rate is too high, not only cause the waste of metal material, the earthing device cost is multiplied.If the material rate choosing is on the low side, not only do not reach requirement serviceable life, also need to carry out in a short time renovating of earthing device, have a strong impact on the operation of power transmission and transforming equipment.
The operation aspect, because that earthing device is embedded in is underground, operation maintenance difficulty, corrosion is difficult to check, many power transmission and transforming equipments are often only paid attention to the measurement of stake resistance in operational management, and have ignored the inspection to equipment ground lead-in wire and earthing device.To such an extent as to just draw attention when having caused serious electrical equipment accident by the earthing device accident, not only incur loss through delay accident treatment and also may cause fault spread, bring about great losses.
The maintenance aspect is then undertaken by cycle time according to " preventive trial rules " at present, and it doesn't matter with the health status of earthing device, far apart with the repair based on condition of component of vigorously advocating at present.This maintenance of being undertaken by the time, specific aim is poor, if carried out unnecessary maintenance, will cause a large amount of manpower and materials wastes.This is because earthing device is to be embedded in underground concealed work, and its excavation checks that quantities is huge, much time power.Do not carry out if earthing device should overhaul reinforcement because of corrosion, the inning that not only missed and taked safeguard measure, prolongs the earthing device life-span also can form great potential safety hazard because of earthing device ground connection hydraulic performance decline.
Therefore, study a kind of method that can carry out to the grounding device corrosion situation comprehensive evaluation, the problem that solves design that the power transmission and transforming equipment earthing device exists at present, operation, maintenance, the aspect such as anticorrosion is had realistic meaning.
Three, summary of the invention
The present invention aims to provide a kind of corrosion condition integrated evaluating method of power transmission and transforming equipment earthing material, and technical matters to be solved is to propose a kind of reliable, easy evaluation method, improves the accuracy that grounding device corrosion is estimated.
The inventor has carried out the analysis of system to the corrosion of earthing device in soil, pinpoints the problems out when corrosion evaluation on the selected index.For this reason, the indexs such as the pH value of the soil that affects the earthing device material corrosion, chloride ion content, sulfate radical content, soil resistivity, oxidation-reduction potential, material corrosion current potential many set conditions tests have been carried out, by the statistical study of data, sum up and obtain technical scheme of the present invention.
The corrosion condition integrated evaluating method of power transmission and transforming equipment earthing material of the present invention is characterized in that:
A, when earthing device is buried the soil pH value at place＜6.8 underground, the corrosion rate＞0.065mm/a of earthing material, the extent of corrosion of earthing material are large; In these soil, do not reach design load the serviceable life of earthing device namely 20 years, recommendation earthing device excavation proof cycle in service is 5 years, and increases the measure of earthing device corrosion protection in good time.Suggestion is selected the better material of corrosion stability or is aided with cathode protection measure during design.
B, when the soil pH value at the earthing device place of burying underground 〉=6.8 and earthing device are buried the soil moisture content at place 〉=35% underground, the corrosion rate＜0.050mm/a of earthing material, the extent of corrosion of earthing material are little; In these soil, can reach design service life the serviceable life of earthing device namely 20 years, the excavation time between overhauls(TBO) of earthing device in service can extend to 20 years.
C, when the soil pH value at the earthing device place of burying underground 〉=6.8 and earthing device are buried the soil moisture content at place＜35% underground, earthing material is buried underground the soil resistivity (ρ at place
15), oxidation-reduction potential (Eh
7), material corrosion current potential (E
Corr), chloride ion content, sulfate radical content five indices investigate:
| Rank | ρ 15(Ω·m) | Eh 7(mV) | E corr(mV) | Cl -(mg/100g soil) | SO 4 2-(mg/100g soil) |
| One-level | >50 | <222 | >-650 | <10 | <10 |
| Secondary | 20-50 | 222～252 | -650～-750 | 10～20 | 10～20 |
| Three grades | <20 | >252 | <-750 | >20 | >20 |
When having in the five indices when being no less than three indexs and reaching three grades; corrosion rate＞the 0.065mm/a of earthing material; the extent of corrosion of earthing material is large; in these soil; do not reach design load the serviceable life of earthing device namely 20 years; recommendation earthing device excavation proof cycle in service is 5 years, and increases the measure of earthing device corrosion protection in good time.Suggestion is selected the better material of corrosion stability or is aided with cathode protection measure during design;
When the rank of five indices is one-level or secondary, corrosion rate＜the 0.050mm/a of earthing material, the extent of corrosion of earthing material is little, in these soil, can reach design service life the serviceable life of earthing device namely 20 years, the excavation time between overhauls(TBO) of earthing device in service can extend to 20 years;
During the extent of corrosion of earthing material was in other situations, differing the serviceable life of earthing material reached the serviceable life in 20 years surely, and being in operation and recommending the time between overhauls(TBO) of earthing device is 10 years.
Relation between extent of corrosion of the present invention and the corrosion rate defines with reference to " power engineering design manual ", and extent of corrosion is little when corrosion rate＜0.050mm/a; Extent of corrosion is large when corrosion rate＞0.065mm/a; During extent of corrosion is when corrosion rate is between 0.050-0.065mm/a.
Evaluation method of the present invention is the corrosion proof on-the-spot test method of earthing material, and the tester carries the corrosion condition that just can learn in the short period of time earthing material in the situation of simple analytical instrument, and is simple, and test result is accurate.
Four, embodiment
1, transformer station's soil physical analysis and corrosion electrochemistry parameter testing
The inventor 2007～2008 years to 9 500kV transformer stations of Anhui Power Grid in 220kV zone and 500kV regional soil carried out soil physical analysis, and carried out the corrosion electrochemistry parameter testing at the scene, the result sees Table respectively 1 and table 2.
Each sampling spot soil physical analysis result of table 1
Annotate: the expression of 2 in the table after transformer station's title 220kV zone, 5 expression 500kV zones.
The soil electrochemistry parameter testing result of table 2 transformer station
Annotate: the expression of 2 in the table after transformer station's title 220kV zone, 5 expression 500kV zones.
2, carbon steel test piece extent of corrosion is tested the contrast that reaches with evaluation method of the present invention
Bury the sheet experiment in each transformer station with carbon steel material respectively as test piece, the uniform corrosion rate of test test piece is (with reference to SY/T " buried steel coupon corrosion rate method of testing ", bury agreement that contracts a film or TV play to an actor or actress after 400 days at substation field, calculate uniform corrosion rate with weight-loss method.), and will compare between test result and the evaluation method of the present invention.It is pointed out that even uniform corrosion rate is very low, extent of corrosion also should be evaluated as greatly when test piece local corrosion degree belongs to heavy or serious.The evaluation of local corrosion degree is with reference to SY/T0087.1-2006 " the outer corrosion of steel pipe and Corrosion of Tanks evaluation criterion buried steel pipeline is directly estimated ", and the evaluation index of pitch corrosion is as shown in the table:
| Project | Slightly | Generally | Heavy | Seriously |
| Maximum pitting corrosion speed (millimeter/year) | ＜0.305 | 0.305～＜0.611 | 0.611～＜2.438 | ≥2.438 |
Because substation grounding material corrosion influence factor is numerous, generally get 1.5-2 margin of safety doubly during engineering is used in addition, margin of safety of the present invention is set as 1.5.
According to above-mentioned evaluation principle, the carbon steel test piece is compared between the test figure in 9 500KV transformer station 500KV zones of Anhui Power Grid and evaluation method of the present invention, the results are shown in Table 3.
As can be seen from Table 3: good corresponding relation is arranged between the extent of corrosion of carbon steel test piece and soil characteristic, and the evaluation result of 9 testing sites all is consistent, and shows that the resulting result of evaluation method of the present invention is accurately, can be used for the anti-corrosion evaluation of earthing material.
In addition, from table 3, can also obtain following result:
(1) Fuyang Ying state transformer station 5, Bangbu Yu understand 5 two websites of transformer station, and its soil corrosivity is little, and the corrosion rate of carbon steel test piece is also little.With reference to " power engineering design manual ", according to its corrosion rate size, can be expected in these transformer station power stations, the carbon steel earthing material can reach design service life, also namely 20 years.The excavation time between overhauls(TBO) of its grounded screen in service can extend to 20 years.
(2) booth transformer station 5, Feixi, Hefei transformer station 5, the flourishing transformer station 5 in Wuhu, Ma'an Mountain are respected when being coated with four websites such as transformer station 5 in the Xuancheng, its soil corrosivity is large, the corrosion rate of carbon steel test piece is also large, surpass the design load of 0.065mm/a, and local corrosion is obvious.Can be expected in these transformer station power stations, the grounded screen of carbon steel material does not reach design load, namely 20 years serviceable life yet.Being in operation and recommending grounded screen excavation proof cycle is 5 years, or increases the measure of grounded screen corrosion protection.
(3) three websites such as Suixi, Huaibei transformer station 5, Chuzhou clear stream transformer station 5, Chaohu Zhao Guan transformer station 5, in its soil corrosivity, the corrosion rate of carbon steel test piece can be expected at these transformer station power stations near design load, and its grounded screen not necessarily can reach the design service life in 20 years.The time between overhauls(TBO) of grounded screen in service can extend to 10 years.
Adopt same method, the test findings of the Anhui Power Grid 220KV of 9 500KV transformer stations regional soil is analyzed and researched, obtain the corresponding relation of table 4.Also can find out from table 4, the actual extent of corrosion of carbon steel material is basically consistent with evaluation result of the present invention.This shows, the evaluation principle that the present invention proposes and evaluation method are feasible, accurately.
Claims (1)
1. the corrosion condition integrated evaluating method of a power transmission and transforming equipment earthing material is characterized in that:
A, when earthing device is buried the soil pH value at place＜6.8 underground, the corrosion rate＞0.065mm/a of earthing material, the extent of corrosion of earthing material are large;
B, when the soil pH value at the earthing device place of burying underground 〉=6.8 and earthing device are buried the soil moisture content at place 〉=35% underground, the corrosion rate＜0.050mm/a of earthing material, the extent of corrosion of earthing material are little;
C, when the soil pH value at the earthing device place of burying underground 〉=6.8 and earthing device are buried the soil moisture content at place＜35% underground, soil resistivity, oxidation-reduction potential, material corrosion current potential, chloride ion content, the sulfate radical content five indices at the earthing material place of burying underground are investigated:
Rank ρ
15(Ω m) Eh
7(mV) E
Corr(mV) Cl
-(mg/100g soil) SO
4 2-(mg/100g soil)
One-level〉50＜222 〉-650＜10＜10
Secondary 20-50 222～252-650～-750 10～20 10～20
Three grades＜20〉252＜-750〉20〉20
When having in the five indices when being no less than three indexs and reaching three grades, the corrosion rate＞0.065mm/a of earthing material, the extent of corrosion of earthing material are large;
When the rank of five indices was one-level or secondary, the corrosion rate＜0.050mm/a of earthing material, the extent of corrosion of earthing material were little;
During the extent of corrosion of earthing material is in other situations.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910977A (en) * | 2016-03-22 | 2016-08-31 | 全球能源互联网研究院 | Power transmission and transformation grounding material soil environment corrosivity comprehensive evaluation method |
| CN107764730A (en) * | 2016-08-18 | 2018-03-06 | 国家电网公司 | The design method of metallic ground material corrosion allowance in a kind of power system |
| CN109187324A (en) * | 2018-09-18 | 2019-01-11 | 广东电网有限责任公司 | Underground concrete structure steel corrodes Nondestructive method |
| CN114166733A (en) * | 2021-11-12 | 2022-03-11 | 西南交通大学 | Grounding device characteristic evaluation method based on influence of high-corrosivity resistance reducing agent |
-
2013
- 2013-01-15 CN CN 201310013634 patent/CN103063564A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910977A (en) * | 2016-03-22 | 2016-08-31 | 全球能源互联网研究院 | Power transmission and transformation grounding material soil environment corrosivity comprehensive evaluation method |
| CN107764730A (en) * | 2016-08-18 | 2018-03-06 | 国家电网公司 | The design method of metallic ground material corrosion allowance in a kind of power system |
| CN107764730B (en) * | 2016-08-18 | 2020-10-02 | 国家电网公司 | Design method for corrosion allowance of metal grounding material in power system |
| CN109187324A (en) * | 2018-09-18 | 2019-01-11 | 广东电网有限责任公司 | Underground concrete structure steel corrodes Nondestructive method |
| CN114166733A (en) * | 2021-11-12 | 2022-03-11 | 西南交通大学 | Grounding device characteristic evaluation method based on influence of high-corrosivity resistance reducing agent |
| CN114166733B (en) * | 2021-11-12 | 2022-07-08 | 西南交通大学 | Grounding device characteristic evaluation method based on influence of high-corrosivity resistance reducing agent |
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Application publication date: 20130424 |