CN109633306A - The temperature rise calculation method of anti-ice-flashing composite insulator - Google Patents
The temperature rise calculation method of anti-ice-flashing composite insulator Download PDFInfo
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- CN109633306A CN109633306A CN201811525987.3A CN201811525987A CN109633306A CN 109633306 A CN109633306 A CN 109633306A CN 201811525987 A CN201811525987 A CN 201811525987A CN 109633306 A CN109633306 A CN 109633306A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
Abstract
The invention discloses a kind of temperature rise calculation methods of anti-ice-flashing composite insulator, performance parameter and application environment parameter including obtaining anti-ice-flashing composite insulator；Calculate ice flashover resistant insulator unit area total calorific value in normal work and the total heat dissipation capacity of unit area；The temperature rise calculating formula of ice flashover resistant insulator is obtained by criterion of the conservation of energy；Calculate the temperature rise data of anti-ice-flashing composite insulator.The temperature rise calculation method of this anti-ice-flashing composite insulator provided by the invention, pass through conservation of energy principle, the temperature rise calculation equation of anti-ice-flashing composite insulator is established according to ice flashover resistant insulator performance parameter and environmental parameter, it is predicted and is calculated so as to the temperature rise data accurately to anti-ice-flashing composite insulator, so as to obtain the temperature rise situation of anti-ice-flashing composite insulator, and then learn ice flashover resistant insulator for freezing disaster weather shield effect.
Description
Technical field
Present invention relates particularly to a kind of temperature rise calculation methods of anti-ice-flashing composite insulator.
Background technique
With the development and the improvement of people's living standards of economic technology, electric energy has become in people's production and life
Essential secondary energy sources bring endless convenience to people's production and life.
Insulator is the important component of electrical system.Since composite insulator has good anti-fouling flashover performance, high machinery
The advantages that intensity, low cost, usage amount of China's composite insulator on super-pressure and UHV transmission line is also increasing year by year
It is more, it is even more to have investigated anti-ice-flashing composite insulator for southern freezing disaster weather.
Often there is the problem of temperature rise at work in anti-ice-flashing composite insulator.Once there is anti-ice-flashing composite insulator to exist
The performance of situations such as temperature rise is excessively high in work, insulator will be seriously threatened, to further will affect the peace of electric system
Complete reliable and stable operation.Therefore, the temperature rise amount of anti-ice-flashing composite insulator at work is calculated and is predicted, be power train
One of vital task of system.
But at present for the temperature rise calculation method of the anti-ice-flashing composite insulator in electric system, often using
Empirical method is predicted or the modes such as laboratory testing, has no complete set, science and reliable calculating process, thus
So that the temperature rise calculating process of anti-ice-flashing composite insulator is relatively inaccurate, and reliability and science be not high.
Summary of the invention
The purpose of the present invention is to provide a kind of temperature rise meters of scientific reliable and high accuracy anti-ice-flashing composite insulator
Calculation method.
The temperature rise calculation method of this anti-ice-flashing composite insulator provided by the invention, includes the following steps:
S1. the performance parameter and application environment parameter of anti-ice-flashing composite insulator are obtained；
S2. the unit area total calorific value of ice flashover resistant insulator in normal work is calculated；
S3. the total heat dissipation capacity of unit area of ice flashover resistant insulator in normal work is calculated；
S4. the unit area total calorific value and step S3 of the ice flashover resistant insulator obtained according to step S2 in normal work
The total heat dissipation capacity of the unit area of obtained ice flashover resistant insulator in normal work obtains anti-ice-flashing using the conservation of energy as criterion
The temperature rise calculating formula of insulator；
S5. using the temperature rise calculating formula of the obtained ice flashover resistant insulator of step S4, the temperature of anti-ice-flashing composite insulator is calculated
Rise data.
The performance parameter and application environment parameter of anti-ice-flashing composite insulator described in step S1, specifically include insulator pole
Between voltage U, running frequency ω, insulator interelectrode capacity C0, dielectric loss tangent tan δ, heat-absorbing paint surface resistivity ρws、
Heat absorbing coating Leakage Current Is, micro- section of creepage distance to insulator rotating shaft distance r (l), corresponding micro- section of creepage distance l,
Creepage distance L, isolator material thermal coefficient λt, it is convective heat-transfer coefficient h, radiation coefficient ε, exhausted at insulator surface any point
To temperature T, environment temperature T0, insulation fructification mean temperature for environment temperature temperature rise Δ T, wind speed vf, insulator disk it is thick
Spend 2e, UfFor insulator spread voltage.
The unit area total calorific value of calculating ice flashover resistant insulator in normal work, specially uses described in step S2
Following formula unit of account area total calorific value:
A. generated calorific value Q is lost using following formula calculation mediumc:
Qc=U2ωC0tanδ
U is insulator voltage across poles in formula, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is dielectric loss
Tangent angle；
B. calorific value Q caused by electric Leakage Current is climbed using following formula gauging surfaces:
ρ in formulawsFor heat-absorbing paint surface resistivity, IsFor heat absorbing coating Leakage Current, r (l) is micro- section of creepage distance and arrives
The distance of insulator rotating shaft, UfFor insulator spread voltage, f be form factor andL is micro- section corresponding
Creepage distance；
C. the calorific value Q of heat absorbing coating is calculated using following formula0:
ε is radiation coefficient, T in formula0For environment temperature, σ is Boltzmann constant；
D. following formula unit of account area total calorific value Q is usedF:
QF=Qc+Qs+Q0
Q in formulacFor calorific value caused by dielectric loss, QsFor calorific value caused by surface creepage Leakage Current, Q0For
The calorific value of heat absorbing coating.
The total heat dissipation capacity of unit area of calculating ice flashover resistant insulator in normal work, specially uses described in step S3
The total heat dissipation capacity of following steps unit of account area:
A. dispersed heat Q is conducted within the unit time using following formula unit of account areaλ:
λ in formulatFor isolator material thermal coefficient, T is the absolute temperature at insulator surface any point；
B. convection current dispersed heat Q is calculated using following formulah:
Qh=h (T-T0)
T is the absolute temperature at insulator surface any point, T in formula0For environment temperature, h is coefficient and h=5.8+4vf,
vfFor wind speed；
C. radiation dispersed heat Q is calculated using following formulaσ:
Qσ=ε σ T4
ε is radiation coefficient in formula, and T is the absolute temperature at insulator surface any point, and σ is Boltzmann constant；
D. the total heat dissipation capacity Q of following formula unit of account area is usedS:
QS=Qλ+Qh+Qσ
Q in formulaλDispersed heat, Q are conducted within the unit time for unit areahFor convection current dispersed heat, QσFor radiation
Dispersed heat.
Using the conservation of energy as criterion described in step S4, the temperature rise calculating formula of ice flashover resistant insulator, specially basis are obtained
The unit area total calorific value of the ice flashover resistant insulator that step S2 is obtained in normal work is equal to the anti-ice-flashing that step S3 is obtained
The total heat dissipation capacity of the unit area of insulator in normal work, to obtain the temperature rise calculating formula of ice flashover resistant insulator.
The temperature rise calculating formula of the ice flashover resistant insulator, specially following formula:
ε is radiation coefficient in formula, and σ is Boltzmann constant, and T is the absolute temperature at insulator surface any point, T0For
Environment temperature, h are convective heat-transfer coefficient, λtFor isolator material thermal coefficient, e is the half of insulator disk face thickness, and Δ T is
Temperature rise of the fructification mean temperature that insulate for environment temperature, UfFor insulator spread voltage, ρwsFor heat-absorbing paint sheet resistance
Rate, f be form factor andL is corresponding micro- section of creepage distance, and r (l) is micro- section of creepage distance and arrives insulation
The distance of sub- rotating shaft, U are insulator voltage across poles, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is medium damage
Consume tangent angle.
The temperature rise calculation method of this anti-ice-flashing composite insulator provided by the invention, by conservation of energy principle, according to
Ice flashover resistant insulator performance parameter and environmental parameter establish the temperature rise calculation equation of anti-ice-flashing composite insulator, so as to standard
True is predicted and is calculated to the temperature rise data of anti-ice-flashing composite insulator, so as to obtain anti-ice-flashing composite insulator
Temperature rise situation, and then learn ice flashover resistant insulator for freezing disaster weather shield effect.
Detailed description of the invention
Fig. 1 is the method flow diagram of the method for the present invention.
Specific embodiment
It is as described in Figure 1 the method flow diagram of the method for the present invention: this anti-ice-flashing composite insulator provided by the invention
Temperature rise calculation method includes the following steps:
S1. the performance parameter and application environment parameter for obtaining anti-ice-flashing composite insulator specifically include insulator interpolar electricity
Press U, running frequency ω, insulator interelectrode capacity C0, dielectric loss tangent tan δ, heat-absorbing paint surface resistivity ρws, heat absorption
Coating Leakage Current Is, micro- section of creepage distance to insulator rotating shaft distance r (l), corresponding micro- section of creepage distance l, climb electricity
Distance L, isolator material thermal coefficient λt, convective heat-transfer coefficient h, radiation coefficient ε, the absolute temperature at insulator surface any point
Spend T, environment temperature T0, insulation fructification mean temperature for environment temperature temperature rise Δ T, wind speed vf, insulator disk face thickness 2e
And UfFor insulator spread voltage etc.；
S2. the unit area total calorific value of ice flashover resistant insulator in normal work is calculated；Specially use following formula
Unit of account area total calorific value:
A. generated calorific value Q is lost using following formula calculation mediumc:
Qc=U2ωC0tanδ
U is insulator voltage across poles in formula, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is dielectric loss
Tangent angle；
B. calorific value Q caused by electric Leakage Current is climbed using following formula gauging surfaces:
ρ in formulawsFor heat-absorbing paint surface resistivity, IsFor heat absorbing coating Leakage Current, r (l) is micro- section of creepage distance and arrives
The distance of insulator rotating shaft, Uf be insulator spread voltage, f be form factor andL is micro- section corresponding
Creepage distance；
C. the calorific value Q of heat absorbing coating is calculated using following formula0:
ε is radiation coefficient, T in formula0For environment temperature, σ is Boltzmann constant；
D. following formula unit of account area total calorific value Q is usedF:
QF=Qc+Qs+Q0
Q in formulacFor calorific value caused by dielectric loss, QsFor calorific value caused by surface creepage Leakage Current, Q0For
The calorific value of heat absorbing coating；
In the specific implementation, for clean surface and perfect heat absorptivity anti-ice-flashing composite insulator, since inside is worn
Calorific value caused by permeability leakage current is few, so having given ignoring in the calculating of this step；
S3. the total heat dissipation capacity of unit area of ice flashover resistant insulator in normal work is calculated；Specially use following steps
The total heat dissipation capacity of unit of account area:
A. dispersed heat Q is conducted within the unit time using following formula unit of account areaλ:
λ in formulatFor isolator material thermal coefficient, T is the absolute temperature at insulator surface any point；
B. convection current dispersed heat Q is calculated using following formulah:
Qh=h (T-T0)
T is the absolute temperature at insulator surface any point, T in formula0For environment temperature, h is coefficient and h=5.8+4vf,
vfFor wind speed；
C. radiation dispersed heat Q is calculated using following formulaσ:
Qσ=ε σ T4
ε is radiation coefficient in formula, and T is the absolute temperature at insulator surface any point, and σ is Boltzmann constant；
D. the total heat dissipation capacity Q of following formula unit of account area is usedS:
QS=Qλ+Qh+Qσ
Q in formulaλDispersed heat, Q are conducted within the unit time for unit areahFor convection current dispersed heat, QσFor radiation
Dispersed heat；
S4. the unit area total calorific value and step S3 of the ice flashover resistant insulator obtained according to step S2 in normal work
The total heat dissipation capacity of the unit area of obtained ice flashover resistant insulator in normal work, using the conservation of energy as criterion, according to step S2
The unit area total calorific value of obtained ice flashover resistant insulator in normal work is equal to the ice flashover resistant insulator that step S3 is obtained
The total heat dissipation capacity of unit area in normal work, to obtain the temperature rise calculating formula of ice flashover resistant insulator；It is specially following to calculate
Formula:
ε is radiation coefficient in formula, and σ is Boltzmann constant, and T is the absolute temperature at insulator surface any point, T0For
Environment temperature, h are convective heat-transfer coefficient, λtFor isolator material thermal coefficient, e is the half of insulator disk face thickness, and Δ T is
Temperature rise of the fructification mean temperature that insulate for environment temperature, UfFor insulator spread voltage, ρwsFor heat-absorbing paint sheet resistance
Rate, f be form factor andL is corresponding micro- section of creepage distance, and r (l) is micro- section of creepage distance and arrives insulation
The distance of sub- rotating shaft, U are insulator voltage across poles, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is medium damage
Consume tangent angle；
S5. using the temperature rise calculating formula of the obtained ice flashover resistant insulator of step S4, the temperature of anti-ice-flashing composite insulator is calculated
Rise data.
By the obtained formula of step S4 it is recognised that the temperature rise of ice flashover resistant insulator mainly with material thermal conductivity λt、
Wind speed v around insulatorf(with parameter h embodiment), heat-absorbing paint surface resistivity ρwsAnd environment temperature T0, radiation coefficient ε has
It closes, therefore in laboratory stage, above-mentioned parameter can be adjusted by simulation software, insulated to observe anti-ice-flashing under different situations
The temperature rise situation of son, so that the temperature rise situation to ice flashover resistant insulator carries out systematic, comprehensive evaluation.
Claims (6)
1. a kind of temperature rise calculation method of anti-ice-flashing composite insulator, includes the following steps:
S1. the performance parameter and application environment parameter of anti-ice-flashing composite insulator are obtained；
S2. the unit area total calorific value of ice flashover resistant insulator in normal work is calculated；
S3. the total heat dissipation capacity of unit area of ice flashover resistant insulator in normal work is calculated；
S4. the ice flashover resistant insulator obtained according to step S2 unit area total calorific value in normal work and step S3 are obtained
The ice flashover resistant insulator total heat dissipation capacity of unit area in normal work obtain anti-ice-flashing insulation using the conservation of energy as criterion
The temperature rise calculating formula of son；
S5. using the temperature rise calculating formula of the obtained ice flashover resistant insulator of step S4, the temperature rise number of anti-ice-flashing composite insulator is calculated
According to.
2. the temperature rise calculation method of anti-ice-flashing composite insulator according to claim 1, it is characterised in that described in step S1
Anti-ice-flashing composite insulator performance parameter and application environment parameter, specifically include insulator voltage across poles U, running frequency
ω, insulator interelectrode capacity C0, dielectric loss tangent tan δ, heat-absorbing paint surface resistivity ρws, heat absorbing coating Leakage Current
Is, micro- section of creepage distance to insulator rotating shaft distance r (l), corresponding micro- section of creepage distance l, creepage distance L, insulator
Material thermal conductivity λt, convective heat-transfer coefficient h, radiation coefficient ε, the absolute temperature T at insulator surface any point, environment temperature
T0, insulation fructification mean temperature for environment temperature temperature rise Δ T, wind speed vf, insulator disk face thickness 2e, UfFor insulator
Spread voltage.
3. the temperature rise calculation method of anti-ice-flashing composite insulator according to claim 2, it is characterised in that described in step S2
Calculating ice flashover resistant insulator unit area total calorific value in normal work, specially use following formula unit of account face
Product total calorific value:
A. generated calorific value Q is lost using following formula calculation mediumc:
Qc=U2ωC0tanδ
U is insulator voltage across poles in formula, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is Dielectric loss tangent
Angle；
B. calorific value Q caused by electric Leakage Current is climbed using following formula gauging surfaces:
ρ in formulawsFor heat-absorbing paint surface resistivity, IsFor heat absorbing coating Leakage Current, r (l) is micro- section of creepage distance and arrives insulation
The distance of sub- rotating shaft, UfFor insulator spread voltage, f be form factor andL is climbing for micro- section of correspondence
Electrical distance；
C. the calorific value Q of heat absorbing coating is calculated using following formula0:
ε is radiation coefficient, T in formula0For environment temperature, σ is Boltzmann constant；
D. following formula unit of account area total calorific value Q is usedF:
QF=Qc+Qs+Q0
Q in formulacFor calorific value caused by dielectric loss, QsFor calorific value caused by surface creepage Leakage Current, Q0For heat absorption
The calorific value of coating.
4. the temperature rise calculation method of anti-ice-flashing composite insulator according to claim 3, it is characterised in that described in step S3
The calculating ice flashover resistant insulator total heat dissipation capacity of unit area in normal work, specially use following steps unit of account face
The total heat dissipation capacity of product:
A. dispersed heat Q is conducted within the unit time using following formula unit of account areaλ:
λ in formulatFor isolator material thermal coefficient, T is the absolute temperature at insulator surface any point；
B. convection current dispersed heat Q is calculated using following formulah:
Qh=h (T-T0)
T is the absolute temperature at insulator surface any point, T in formula0For environment temperature, h is coefficient and h=5.8+4vf, vfFor
Wind speed；
C. radiation dispersed heat Q is calculated using following formulaσ:
Qσ=ε σ T4
ε is radiation coefficient in formula, and T is the absolute temperature at insulator surface any point, and σ is Boltzmann constant；
D. the total heat dissipation capacity Q of following formula unit of account area is usedS:
QS=Qλ+Qh+Qσ
Q in formulaλDispersed heat, Q are conducted within the unit time for unit areahFor convection current dispersed heat, QσIt scatters and disappears to radiate
Heat.
5. the temperature rise calculation method of anti-ice-flashing composite insulator according to claim 4, it is characterised in that described in step S4
Using the conservation of energy as criterion, obtain the temperature rise calculating formula of ice flashover resistant insulator, the anti-ice-flashing specially obtained according to step S2
The unit area total calorific value of insulator in normal work is equal to the obtained ice flashover resistant insulator of step S3 in normal work
The total heat dissipation capacity of unit area, to obtain the temperature rise calculating formula of ice flashover resistant insulator.
6. the temperature rise calculation method of anti-ice-flashing composite insulator according to claim 5, it is characterised in that described is anti-icing
The temperature rise calculating formula of flash insulator, specially following formula:
ε is radiation coefficient in formula, and σ is Boltzmann constant, and T is the absolute temperature at insulator surface any point, T0For environment temperature
Degree, h is convective heat-transfer coefficient, λtFor isolator material thermal coefficient, e is the half of insulator disk face thickness, and Δ T is insulator
Temperature rise of the entity mean temperature for environment temperature, UfFor insulator spread voltage, ρwsFor heat-absorbing paint surface resistivity, f is
Form factor andL is corresponding micro- section of creepage distance, and r (l) is micro- section of creepage distance and turns round to insulator
The distance of axis, U are insulator voltage across poles, and ω is running frequency, C0For insulator interelectrode capacity, tan δ is Dielectric loss tangent
Angle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672956A (en) * | 2019-10-14 | 2020-01-10 | 华北电力大学 | Composite insulator temperature rise judging method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326429A (en) * | 1998-05-20 | 1999-11-26 | Toshiba Corp | Insulation diagnostic method and device for dry insulation equipment |
| CN1995251A (en) * | 2006-12-27 | 2007-07-11 | 清华大学深圳研究生院 | Paint for preventing covering ice for insulator and its preparation method |
| CN103336224A (en) * | 2013-07-03 | 2013-10-02 | 同济大学 | Complex information based insulator temperature rise fault comprehensive diagnosis method |
| CN103941126A (en) * | 2014-04-24 | 2014-07-23 | 深圳供电局有限公司 | Heat convection testing method and system for composite insulator including artificial defect |
| CN108363829A (en) * | 2017-12-29 | 2018-08-03 | 广州供电局有限公司 | Insulator temperature rises diagnostic method and system |
-
2018
- 2018-12-13 CN CN201811525987.3A patent/CN109633306A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326429A (en) * | 1998-05-20 | 1999-11-26 | Toshiba Corp | Insulation diagnostic method and device for dry insulation equipment |
| CN1995251A (en) * | 2006-12-27 | 2007-07-11 | 清华大学深圳研究生院 | Paint for preventing covering ice for insulator and its preparation method |
| CN103336224A (en) * | 2013-07-03 | 2013-10-02 | 同济大学 | Complex information based insulator temperature rise fault comprehensive diagnosis method |
| CN103941126A (en) * | 2014-04-24 | 2014-07-23 | 深圳供电局有限公司 | Heat convection testing method and system for composite insulator including artificial defect |
| CN108363829A (en) * | 2017-12-29 | 2018-08-03 | 广州供电局有限公司 | Insulator temperature rises diagnostic method and system |
Non-Patent Citations (2)
| Title |
|---|
| 张达: "湿污绝缘子发热及污秽放电机理", 《高电压技术》 * |
| 陈刚: "覆冰在绝缘子上的形成机理及其防范措施", 《中国博士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672956A (en) * | 2019-10-14 | 2020-01-10 | 华北电力大学 | Composite insulator temperature rise judging method |
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Application publication date: 20190416 |