CN107246925A - A kind of current transformer thermal circuit model analysis method - Google Patents
A kind of current transformer thermal circuit model analysis method Download PDFInfo
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- CN107246925A CN107246925A CN201710396190.7A CN201710396190A CN107246925A CN 107246925 A CN107246925 A CN 107246925A CN 201710396190 A CN201710396190 A CN 201710396190A CN 107246925 A CN107246925 A CN 107246925A
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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
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Abstract
The present invention relates to technical field of electric power, a kind of particularly current transformer thermal circuit model analysis method, wherein, current transformer includes coil, porcelain bushing shell, iron core, the conduction oil that iron core is submerged and the sulfur hexafluoride gas being filled between porcelain bushing shell and current transformer casing, including：First sensor configuration is used for the mean wind speed of the local environment of measurement current transform er on the surface of current transformer；Second sensor configures for compartment of terrain at a certain distance is being used for the average ambient temperature of environment where measurement current transform er outside current transformer；3rd sensor, which is immersed in, is used for the heat conduction oil temperature for measuring conduction oil in the conduction oil of current transformer；Processing unit, the hot(test)-spot temperature for going out current transformer according to mean wind speed, average ambient temperature and conduction oil Temperature Treatment.The beneficial effects of the invention are as follows：The parameter of consideration is more, such as：Wind speed, ambient parameter, wait and make it that the result by the system processing is accurate.
Description
Technical field
The present invention relates to technical field of electric power, a kind of particularly current transformer thermal circuit model analysis method.
Background technology
Current transformer is widely used in the measurement and protection of power system, is one of visual plant of power system, its
The safe and stable and economical operation of reliability and the degree of accuracy to power system has important influence.Hot(test)-spot temperature is to influence it
One key factor of insulation characterisitic, additionally due to current transformer employs some optics and active electronic device, it
Influence of the temperature to its measurement accuracy is must take into consideration in actual motion, therefore the hot(test)-spot temperature of research current transformer has ten
Divide important meaning.
Above-mentioned will have following point in the prior art：
1. the factor considered in the method for traditional measurement processing is inadequate；
2. without being accounted in any processing method or measuring system to the wind speed of current transformer so that
It is inaccurate in the weather measurement result of strong wind.
The content of the invention
The problem of existing for prior art, the present invention is intended to provide a kind of hot(test)-spot temperature measurement system of current transformer
System, the current transformer includes coil, porcelain bushing shell, iron core, the conduction oil that the iron core is submerged and is filled in the insulator
Sulfur hexafluoride gas between pipe and the current transformer casing, it is characterised in that including：
First sensor, is configured on the surface of the current transformer, the residing ring for measuring the current transformer
The mean wind speed in border；
Second sensor is at a certain distance compartment of terrain configuration outside the current transformer, described for measuring
The average ambient temperature of environment where current transformer；
3rd sensor, is immersed in the conduction oil of the current transformer, for measuring leading for the conduction oil
Hot oil temperature；
Processing unit, connects each first sensor, each first sensor, each second biography respectively
Sensor and each 3rd sensor, at according to the mean wind speed, the average ambient temperature and the heat conduction oil temperature
Manage out the hot(test)-spot temperature of the current transformer.
Further, in the preferred embodiment of the invention, the processing unit includes：
First processor, connects the 3rd sensor, for obtaining the electric current according to the conduction oil Temperature Treatment
First thermal resistance of the coil of transformer to the conduction oil；
Second processor, for handle obtain on the inside of the conduction oil to the porcelain bushing shell of the current transformer the
Two thermal resistances；
3rd processor, the porcelain bushing shell that the current transformer is obtained for handling conducts the 3rd thermal resistance；
Fourth processor, connects the first sensor, mutual for obtaining the electric current according to mean wind speed processing
Fourth thermal resistance of the porcelain bushing shell of sensor to air：
5th processor, connects the first processor, the second processor, the 3rd processor, described respectively
Fourth processor and the second sensor, according to first thermal resistance, second thermal resistance, the 3rd thermal resistance, described
4th thermal resistance and the average ambient temperature obtain the focus of the current transformer of the current transformer by processing
Temperature.
Further, in the preferred embodiment of the invention, first thermal resistance is handled by following formula and obtained：
In above formula, Rcu-oilFirst thermal resistance, T for the coil to the conduction oiloilFor averagely described conduction oil
Temperature, IedFor rated current, RHCoil resistance, R described in high-pressure sideLCoil resistance, n described in low-pressure side are the coil turn
Number ratio and QFeFor open circuit loss；
Further, in the preferred embodiment of the invention, second thermal resistance is handled by following formula and obtained：
In above formula, RoilIt is outside the porcelain bushing shell for second thermal resistance on the inside of the conduction oil to the porcelain bushing shell, d
Footpath, L are the insulator length of tube, hoilFor the thermal conductivity factor of the conduction oil；
Further, in the preferred embodiment of the invention, the 3rd thermal resistance is handled by following formula and obtained：
In above formula, RceThe 3rd thermal resistance, r are conducted for the porcelain bushing shell1It is the insulator pipe internal surface radius, r2It is institute
State appearance radius surface, the λ of porcelain bushing shellTIt is that the ceramic rate and L of the porcelain bushing shell are the length of the porcelain bushing shell；
Further, in the preferred embodiment of the invention, the 4th thermal resistance is handled by following formula and obtained：
In above formula, Rce-airFor the 4th thermal resistance of the porcelain bushing shell to air,For the ceramic surface and air
Average Nu Saier coefficients, the λ of convection currentairThe mean wind speed described in air conduction rate and v；
Further, in the preferred embodiment of the invention, the hot(test)-spot temperature is handled by following formula and obtained：
Ts=Q (Rcu-oil+Roil+Rce+Rce-air)+Te
In above formula, TsFor the hot(test)-spot temperature of the current transformer, Q is the current transformer total heat lost, TeFor
The average ambient temperature that the current transformer is located at.
Further, in the preferred embodiment of the invention, the ceramic surface described averagely exerts match with cross-ventilated
You are handled coefficient by following formula,
In above formula, RedFor Reynolds number and PrFor Prandtl number.
Further, in the preferred embodiment of the invention, the thermal conductivity factor of the conduction oil is carried out by following formula
Processing,
In above formula, NufFor average nusselt number andFor the sulfur hexafluoride gas thermal conductivity factor.
Further, in the preferred embodiment of the invention, the Reynolds number is handled by following formula,
In above formula, ρairFor atmospheric density and μairFor air force viscosity.
The beneficial effect of the technical program is：The parameter of consideration is more, such as：Wind speed, ambient parameter, are waited so that being by this
The result handled of uniting is accurate.
Brief description of the drawings
Fig. 1 is the schematic diagram of the embodiment of the thermal circuit model of the present invention.
Embodiment
The accompanying drawing that lower section will be combined in the embodiment of the present invention, is carried out clear, complete to the technical scheme in the embodiment of the present invention
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
Below with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
A kind of hot(test)-spot temperature measuring system of current transformer, as shown in figure 1, current transformer include coil, porcelain bushing shell,
Iron core, the conduction oil that iron core is submerged and the sulfur hexafluoride gas being filled between porcelain bushing shell and current transformer casing, wherein,
Including：
First sensor, configuration is on the surface of current transformer, and the local environment for measurement current transform er is averaged
Wind speed；
Second sensor is at a certain distance compartment of terrain configuration outside current transformer, for measuring Current Mutual Inductance
The average ambient temperature of environment where device；
3rd sensor, is immersed in the conduction oil of current transformer, the heat conduction oil temperature for measuring conduction oil；
Processing unit, connects each first sensor, each first sensor, each second sensor and each respectively
Three sensors, the hot(test)-spot temperature for going out current transformer according to mean wind speed, average ambient temperature and conduction oil Temperature Treatment.
It is preferred that, in above-mentioned preferred embodiment of the invention, processing unit includes：
First processor, connects 3rd sensor, the coil for obtaining current transformer according to conduction oil Temperature Treatment
To the first thermal resistance of conduction oil；
Second processor, the second thermal resistance on the inside of the conduction oil to porcelain bushing shell of current transformer is obtained for processing；
3rd processor, the porcelain bushing shell that current transformer is obtained for handling conducts the 3rd thermal resistance；
Fourth processor, connects first sensor, and the porcelain bushing shell of current transformer is obtained for being handled according to mean wind speed
To the 4th thermal resistance of air：
5th processor, connects first processor, second processor, the 3rd processor, fourth processor and the respectively
Two sensors, are obtained according to the first thermal resistance, the second thermal resistance, the 3rd thermal resistance, the 4th thermal resistance and average ambient temperature by processing
The hot(test)-spot temperature of the current transformer of current transformer.
It is preferred that, in above-mentioned preferred embodiment of the invention, the first thermal resistance is handled by following formula and obtained：
In above formula, Rcu-oilThe first thermal resistance, T for coil to conduction oiloilFor average heat conduction oil temperature, IedFor specified electricity
Stream, RHFor high-pressure side coil resistance, RLIt is coil ratio and Q for low-voltage side coil resistance, nFeFor open circuit loss.
It is preferred that, in above-mentioned preferred embodiment of the invention, the second thermal resistance is handled by following formula and obtained：
In above formula, RoilFor the second thermal resistance on the inside of conduction oil to porcelain bushing shell, d be porcelain bushing shell external diameter, L be insulator length of tube,
hoilFor the thermal conductivity factor of conduction oil；
It is preferred that, in above-mentioned preferred embodiment of the invention, the 3rd thermal resistance is handled by following formula and obtained：
In above formula, RceThe 3rd thermal resistance, r are conducted for porcelain bushing shell1It is insulator pipe internal surface radius, r2It is the outer surface of porcelain bushing shell
Radius, λTIt is that the ceramic rate and L of porcelain bushing shell are the length of porcelain bushing shell；
It is preferred that, in above-mentioned preferred embodiment of the invention, the 4th thermal resistance is handled by following formula and obtained：
In above formula, Rce-airFor the 4th thermal resistance of porcelain bushing shell to air,Averagely exerted with cross-ventilated for ceramic surface
Sai Er coefficients, λairFor air conduction rate and v mean wind speeds；
It is preferred that, in above-mentioned preferred embodiment of the invention, hot(test)-spot temperature is handled by following formula and obtained：
Ts=Q (Rcu-oil+Roil+Rce+Rce-air)+Te
In above formula, TsFor the hot(test)-spot temperature of current transformer, Q is current transformer total heat lost, TeFor current transformer position
In average ambient temperature.
It is preferred that, in above-mentioned preferred embodiment of the invention, ceramic surface and cross-ventilated average Nu Saier coefficients
Handled by following formula,
In above formula, RedFor Reynolds number and PrFor Prandtl number.
It is preferred that, in above-mentioned preferred embodiment of the invention, the thermal conductivity factor of conduction oil is handled by following formula,
In above formula, NufFor average nusselt number andFor sulfur hexafluoride gas thermal conductivity factor.
It is preferred that, in the above-mentioned preferred embodiment of the invention, Reynolds number is handled by following formula,
In above formula, ρairFor atmospheric density and μairFor air force viscosity.
Specifically, in above-mentioned preferred embodiment, hot(test)-spot temperature TsWith environment temperature TeUnit for DEG C, Current Mutual Inductance
Device total heat lost Q unit is W, the first thermal resistance Rcu-oil, the second thermal resistance RoilWith the 3rd thermal resistance RceUnit for DEG C/W.
Specifically, in above-mentioned preferred embodiment, the path that hot-fluid is passed in the thermal circuit model of current transformer is from line
Enclose the first thermal resistance R to conduction oilcu-oilThe second thermal resistance R on the inside of → conduction oil to porcelain bushing shelloilThe heat of → porcelain bushing shell conduction the 3rd
Hinder RceThe fourth thermal resistance R of → porcelain bushing shell to airce-air.During heat conducts, the direction passed to according to hot-fluid with it is whole
The total heat lost Q of porcelain bushing shell product, which calculates whole hot-fluid and passes to hot path by this, can calculate the heating of the hot paths
Amplitude, ao T, then adds environment temperature TeThe hot(test)-spot temperature T of current transformer can be calculateds。
Specifically, in above-mentioned preferred embodiment of the invention, conduction oil temperature rise ToilUnit for DEG C, nominal loss QedIt is single
Position is W.
Specifically, in above-mentioned preferred embodiment, high-pressure side coil resistance RHWith low-voltage side coil resistance RLUnit is
Ω, open circuit loss QFeUnit be W.
Specifically, in above-mentioned preferred embodiment, the unit of porcelain bushing shell outside diameter d is m, and insulator length of tube L unit is
M, the thermal conductivity factor λ of conduction oiloilUnit be W/ (mK).
Specifically, in above-mentioned preferred embodiment, the unit of cross-ventilation COEFFICIENT K is W/ (m2·℃)
Specifically, in above-mentioned preferred embodiment, speed air flow v unit is m/s, air conduction rate λair's
Unit is W/ (mK).
Specifically, in above-mentioned preferred embodiment, c, n and RedBetween relation be determined by following table.
Table 1c, n and RedBetween relation table
| Red | c | n |
| (0.4,4] | 0.989 | 0.33 |
| (4,40] | 0.911 | 0.385 |
| (40,4×103] | 0.683 | 0.466 |
| (4×103,4×105] | 0.193 | 0.618 |
| (4×105,4×107] | 0.027 | 0.805 |
Specifically, in above-mentioned preferred embodiment, sulfur hexafluoride gas thermal conductivity factorUnit be W/ (mK).
Specifically, in above-mentioned preferred embodiment, atmospheric density ρairUnit be kg/m3, air force viscosity, muair
Unit Ns/m2。
Specifically, in above-mentioned preferred embodiment, at different temperatures, the dynamic viscosity of air is different, and its is specific
Content is：
Work as Te<When 10, μair=14.16 × 10-6, Pr=0.705, λair=2.51 × 10-2, ρair=1.247；
Work as Te<When 20, μair=15.06 × 10-6, Pr=0.703, λair=2.59 × 10-2, ρair=1.205；
Work as Te<When 30, μair=16.00 × 10-6, Pr=0.701, λair=2.67 × 10-2, ρair=1.165；
Work as Te<When 40, μair=16.96 × 10-6, Pr=0.699, λair=2.76 × 10-2, ρair=1.128；
Work as TeWhen >=40, μair=19.96 × 10-6, Pr=0.698, λair=2.83 × 10-2, ρair=1.100.
Specifically, according in the above-mentioned above-mentioned preferred embodiment of the present invention, in order to further illustrate the present invention's
Calculating process, will be made below further instruction.
Embodiment one：
The parameter of setting is as follows：
Rated voltage Ued=110kV, rated current Ied=150A, porcelain bushing shell mean outside diameter r1=1m, r2=0.8m, insulator
Length of tube L=1m；Environment temperature Te=25 DEG C, wind speed v=0.5m/s, high pressure winding resistance RH=0.01 Ω, low pressure winding resistance
RL=0.11 Ω, core loss QFe=20W, turn ratio n=200, running current I=100A, average oil temperature rise Toil=20 DEG C,
SF6Thermal conductivity factorCeramic rate λT=1.5W/ (mK).
Calculation procedure is as follows：
Ts=Q (Rcu-oil+Roil+Rce+Rce-air)+Te=161.9323 DEG C
Finally give in this condition, the temperature of transformer focus is 161.9323 DEG C.
Embodiment two：
The parameter of setting is as follows：
Rated voltage Ued=220kV, rated current Ied=100A, porcelain bushing shell mean outside diameter r1=1.5m, r2=1.3m, porcelain
Casing length L=1.5m；Environment temperature Te=35 DEG C, wind speed v=0.5m/s, high pressure winding resistance RH=0.03 Ω, low pressure winding
Resistance RL=0.15 Ω, core loss QFe=25W, turn ratio n=100, running current I=80A, average oil temperature rise Toil=30
DEG C, SF6Thermal conductivity factorCeramic rate λT=1.5W/ (mK).
Calculation procedure is as follows：
Ts=Q (Rcu-oil+Roil+Rce+Rce-air)+Te=182.6084 DEG C
Finally give in this condition, the temperature of transformer focus is 182.6084 DEG C.
Preferred embodiments of the present invention are these are only, embodiments of the present invention and protection domain is not thereby limited, it is right
For those skilled in the art, it should can appreciate that all utilization description of the invention and being equal made by diagramatic content replace
Change and obviously change resulting scheme, should be included in protection scope of the present invention.
Claims (10)
1. a kind of hot(test)-spot temperature measuring system of current transformer, the current transformer include coil, porcelain bushing shell, iron core, general
The conduction oil of the iron core submergence and the sulfur hexafluoride gas being filled between the porcelain bushing shell and the current transformer casing,
It is characterised in that it includes：
First sensor, configuration is on the surface of the current transformer, the local environment for measuring the current transformer
Mean wind speed；
Second sensor is at a certain distance compartment of terrain configuration outside the current transformer, for measuring the electric current
The average ambient temperature of environment where transformer；
3rd sensor, is immersed in the conduction oil of the current transformer, the conduction oil for measuring the conduction oil
Temperature；
Processing unit, connects each first sensor, each first sensor, each second sensor respectively
With each 3rd sensor, for being gone out according to the mean wind speed, the average ambient temperature and the conduction oil Temperature Treatment
The hot(test)-spot temperature of the current transformer.
2. the hot(test)-spot temperature measuring system of current transformer according to claim 1, it is characterised in that the processing unit
Including：
First processor, connects the 3rd sensor, for obtaining the Current Mutual Inductance according to the conduction oil Temperature Treatment
First thermal resistance of the coil of device to the conduction oil；
Second processor, the second heat on the inside of the conduction oil to the porcelain bushing shell of the current transformer is obtained for processing
Resistance；
3rd processor, the porcelain bushing shell that the current transformer is obtained for handling conducts the 3rd thermal resistance；
Fourth processor, connects the first sensor, and the current transformer is obtained for being handled according to the mean wind speed
The porcelain bushing shell to air the 4th thermal resistance：
5th processor, connects the first processor, the second processor, the 3rd processor, the described 4th respectively
Processor and the second sensor, according to first thermal resistance, second thermal resistance, the 3rd thermal resistance, the described 4th
Thermal resistance and the average ambient temperature obtain the hot(test)-spot temperature of the current transformer of the current transformer by processing.
3. the hot(test)-spot temperature measuring system of current transformer according to claim 2, it is characterised in that
First thermal resistance is handled by following formula and obtained：
In above formula, Rcu-oilFirst thermal resistance, T for the coil to the conduction oiloilFor averagely described heat conduction oil temperature,
IedFor rated current, RHCoil resistance, R described in high-pressure sideLCoil resistance, n described in low-pressure side are the coil ratio
And QFeFor open circuit loss.
4. the hot(test)-spot temperature measuring system of current transformer according to claim 2, it is characterised in that second thermal resistance
Handled and obtained by following formula：
In above formula, RoilIt is the porcelain bushing shell external diameter, L for second thermal resistance on the inside of the conduction oil to the porcelain bushing shell, d
For the insulator length of tube, hoilFor the thermal conductivity factor of the conduction oil.
5. the hot(test)-spot temperature measuring system of current transformer according to claim 2, it is characterised in that the 3rd thermal resistance
Handled and obtained by following formula：
In above formula, RceThe 3rd thermal resistance, r are conducted for the porcelain bushing shell1It is the insulator pipe internal surface radius, r2It is the porcelain
Appearance radius surface, the λ of sleeve pipeTIt is that the ceramic rate and L of the porcelain bushing shell are the length of the porcelain bushing shell.
6. the hot(test)-spot temperature measuring system of current transformer according to claim 2, it is characterised in that the 4th thermal resistance
Handled and obtained by following formula：
In above formula, Rce-airFor the 4th thermal resistance of the porcelain bushing shell to air,For the ceramic surface and cross-ventilation
Average Nu Saier coefficients, λairThe mean wind speed described in air conduction rate and v.
7. the hot(test)-spot temperature measuring system of current transformer according to claim 2, it is characterised in that the hot(test)-spot temperature
Handled and obtained by following formula：
Ts=Q (Rcu-oil+Roil+Rce+Rce-air)+Te
In above formula, TsFor the hot(test)-spot temperature of the current transformer, Q is the current transformer total heat lost, TeTo be described
The average ambient temperature that current transformer is located at.
8. the hot(test)-spot temperature measuring system of current transformer according to claim 6, it is characterised in that the ceramic surface
Handled with the cross-ventilated average Nu Saier coefficients by following formula,
In above formula, RedFor Reynolds number and PrFor Prandtl number.
9. the hot(test)-spot temperature measuring system of current transformer according to claim 4, it is characterised in that the conduction oil
The thermal conductivity factor is handled by following formula,
In above formula, NufFor average nusselt number andFor the sulfur hexafluoride gas thermal conductivity factor.
10. the hot(test)-spot temperature measuring system of current transformer according to claim 8, it is characterised in that the Reynolds number
Handled by following formula,
In above formula, ρairFor atmospheric density and μairFor air force viscosity.
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Application publication date: 20171013 |