CN106225942B - A method of measuring overhead transmission line natural convection temperature field - Google Patents
A method of measuring overhead transmission line natural convection temperature field Download PDFInfo
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- CN106225942B CN106225942B CN201610668081.1A CN201610668081A CN106225942B CN 106225942 B CN106225942 B CN 106225942B CN 201610668081 A CN201610668081 A CN 201610668081A CN 106225942 B CN106225942 B CN 106225942B
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- thermocouple
- conducting wire
- split bearing
- transmission line
- temperature field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Abstract
The invention discloses a kind of methods measuring overhead transmission line natural convection temperature field using the fixed colyliform thermocouple cluster of stepper motor driven split bearing, mainly include the following steps：S1, several thermocouples are formed into colyliform thermocouple cluster, and be uniformly fixed on split bearing driven by stepper motors.Each thermocouple temperature measurement contact is inconsistent at a distance from conducting wire, for measuring and the temperature of thermal field at conducting wire different distance.S2, split bearing outer ring are rotated a circle around conducting wire with a certain period and just obtain specifying orientation, the Temperature Distribution of distance to a declared goal around conducting wire later.The present invention has considered a variety of knowledge such as power overhead network thermo parameters method, measuring technique and Engineering Thermophysics, can not can influence its original Temperature Distribution as possible again under the premise of more accurately measuring overhead line temperature field surrounding distribution situation.
Description
Technical field
The present invention relates to the thermometry of thermocouple, motor drag principle, overhead power transmission line technology and with the hot object of engineering
Manage relevant technical field, and in particular to a kind of to be measured using the fixed colyliform thermocouple cluster of stepper motor driven split bearing
The method of overhead transmission line natural convection temperature field.
Background technology
General overhead transmission line should all meet the equation of heat balance of following form：
QR+Qt=Ql+Qf (1)
Wherein, QRRepresent the Joule heat of unit length conductor generation, QtRepresent the solar radiation suffered by unit length conductor
Heat, QlRepresent the heat loss through convection amount of unit length problem, QfRepresent the heat loss through radiation amount of unit length conductor.
Since the Joule heat formula of conductor is：
QR=I2Rac (2)
Simultaneous formula (1) and formula (2), the current-carrying capacity equation that can obtain conductor are as follows：
It can be seen that, the current-carrying capacity of conducting wire and the heat absorption of conducting wire and heat dissipation are in close relations related, and increase is led from formula (3)
One important method of body current-carrying capacity is exactly to increase the heat dissipation capacity of conductor, and be most importantly to wandering in the heat dissipation of overhead line
Heat, therefore have great importance to the current-carrying capacity of lifting lead wire to the research of heat loss through convection situation.
In current research, the convection current of conducting wire and the surface of conducting wire are concentrated mainly on to the free convection situation of conducting wire
The relationship research of temperature, in terms of being concentrated mainly on emulation and numerical computations about the research of conducting wire temperature field surrounding.And in reality
In the overhead line operation on border, it is especially considering that in the double bundle conductor operation of non-installation interval stick, the temperature between conducting wire
Degree influences to be a highly important research topic, and the conducting wire of actual motion passes through since the environment residing for it is sufficiently complex
The temperature field situation that theoretical calculation obtains tends not to meet the requirements, therefore carries out experimental study to the nearly thermo parameters method of conducting wire
Very it is necessary to urgently just provide a kind of feasible, convenient monitoring method for the monitoring of the nearly temperature field of overhead line at present.
Invention content
The purpose of the invention is to overcome the measurement table for measuring in the prior art and making somebody a mere figurehead temperature of electric transmission line and generally using
Face temperature and the shortcomings that ignore nearly temperature profile effect, a kind of side measuring overhead transmission line natural convection temperature field is provided
Method, measuring temperature field type used by this method are greatly reduced than infrared thermography method cost, have good economy
Property.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A method of overhead transmission line natural convection temperature field is measured, is included the following steps:
S1, several thermocouples are formed into the colyliform thermocouple cluster that length differs, and be uniformly fixed on by stepper motor
On the split bearing of driving；
S2, the split bearing outer ring are rotated a circle with a certain period around conducting wire just obtains designated parties around conducting wire later
Position, distance to a declared goal Temperature Distribution.
Further, the thermocouple is uniformly fixed on different direction on the split bearing, and each two thermocouple is solid
Fixed point and the angle of conducting wire axial connecting line are θ, and the quantity for the point that the angle theta measures as needed determines.
Further, when the quantity of thermocouple in the colyliform thermocouple cluster is n roots, each two thermocouple connects with axle center
The angle of line is：
Further, carrying out bending after the thermocouple is on fixed to the split bearing to it makes the thermocouple
It is perpendicular with conducting wire, and the length of the part bent should be determined according to the specific height for measuring position, and leave in advance
Certain length l0, thermocouple temperature measurement proximate contacts is made to carry out opposite curved for the second time of primary and first time overbending direction again
Folding keeps the thermocouple wire at thermocouple temperature measurement contact parallel with conducting wire.
Further, the thermocouple temperature measurement contact is different at a distance from conducting wire axle center；If the thermocouple is answered
It is the temperature field at h when measuring height, and the inner ring internal diameter of the split bearing and outer ring outer diameter thickness are 2x, then the heat
Length between galvanic couple inflection point and the thermocouple temperature measurement contact is：|h-x|+l0。
Further, it is mutually obstructed without in kind between the thermocouple temperature measurement contact and conducting wire.
Further, split bearing outer ring angle of each pulse rotation under stepper motor driving is equal to the folder
Angle θ.
Further, the step angle of the stepper motorMeet：
Wherein, k represents the reference diameter and stepping motor gear reference diameter of the gear on split bearing outer ring
Ratio.
Further, the split bearing keeps specified time to ensure that the thermocouple is surveyed under each state
Temperature sufficiently achieves stable state.
Further, the section of the specified time is 0.9min to 1.1min.
The present invention has the following advantages and effects with respect to the prior art：
1) in the present invention, due to that using the temperature field around thermocouple measurement conducting wire, can greatly reduce
The cost of equipment, the device used if measuring temperature field under normal circumstances such as infrared test or ultraviolet imagery are set
Its standby cost can greatly increase, and have many inconvenients applying also.
2) carry out the temperature at the different location around measure traverse line using the rotation of stepper motor in the present invention, this
The each thermocouple of sample can measure the temperature of many places, reduce the usage quantity of thermocouple, not only reduce cost, but also letter
The complexity for having changed device, the use in actually measuring are easier.
Description of the drawings
Fig. 1 is the front view of the equipment of the colyliform thermocouple cluster measurement free convection under stepper motor driving in the present invention；
Fig. 2 is the side view of the equipment of the colyliform thermocouple cluster measurement free convection under stepper motor driving in the present invention；
Fig. 3 is a kind of flow chart of method measuring overhead transmission line natural convection temperature field disclosed by the invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 3 is referred to, Fig. 3 is a kind of side measuring overhead transmission line natural convection temperature field disclosed in the present embodiment
The flow chart of method.A kind of measured using the fixed colyliform thermocouple cluster of stepper motor driven split bearing shown in Fig. 3 is maked somebody a mere figurehead
The method of transmission line of electricity natural convection temperature field, specifically includes following steps：
S1, several thermocouples are formed into the colyliform thermocouple cluster that length differs, and be uniformly fixed on by stepper motor
On the split bearing of driving；
(1) thermocouple is uniformly fixed on split bearing with different direction, each two thermocouple fixed point and conducting wire axle center
The angle of line is θ；
Thermocouple should the fixed specific location quantity of point that measures as needed determine, when taking n in this patent
When root thermocouple, the angle of each two thermocouple and axial connecting line is：
(2) thermocouple temperature measurement contact is different at a distance from conducting wire axle center；
In concrete application, every thermocouple on fixed to split bearing after it should be carried out bending make thermocouple with
Conducting wire is perpendicular, and the length of the part bent should be determined according to the specific height for measuring position, and should reserve
Certain length l down0, l0Major significance be to make the proximate contacts of thermocouple to carry out primary and first time overbending direction again
Opposite second of bending, making the thermocouple wire at thermocouple temperature measurement contact, parallel with conducting wire (concrete condition is shown in explanation
Side view in book attached drawing).If it is the temperature field at h that certain root thermocouple, which should measure height, and in the inner ring of split bearing
Diameter is 2x with outer ring outer diameter thickness, then the length between thermocouple inflection point and thermocouple temperature measurement contact is：|h-x|+l0, root
The position of inflection point of thermocouple wire is obtained according to the formula, then measures and thermocouple temperature measurement contact is apart l0It is secondary curved
Break, and mark.
(3) split bearing is driven by stepper motor；
In concrete application, the inner ring of the split bearing is fixed on conducting wire, and the outer ring of split bearing is fixed on outside inner ring
It encloses and determines after it can well slide, stepper motor is fixed on the outer ring of conducting wire.
(4) pass through its other party without other mutually barrier, thermocouple cold junctions in kind between thermocouple temperature measurement contact and conducting wire
Formula is connect with temperature display meter.
It has been fixed in split bearing, stepper motor, and all thermocouple wires has been carried out after bending twice, it will
Thermocouple wire is fixed on the outer peripheral surface of split bearing on labeled good position, can use nylon rope or other elements
By its bondage on bearing outer ring, and ensure that just an all inflection points is fixed on the outer surface of bearing outer ring.
Thermocouple wire in this way after twice bended point is parallel with conducting wire, and the thermocouple wire between an inflection point and twice bended point
It is perpendicular, it can be ensured that interfere without others object (such as thermocouple wire) between the temperature measuring point and conducting wire of thermocouple, carry significantly
The high accuracy measured.
S2, split bearing outer ring, which are rotated a circle with a certain period around conducting wire, just to be obtained specifying orientation around conducting wire later, refer to
The Temperature Distribution of set a distance；
(1) split bearing outer ring angle of each pulse rotation under stepper motor driving is equal to θ；
In concrete application, in order to make the outer ring rotation angle of stepper motor bearing under the action of each pulse be θ, i.e.,
Bearing outer ring can be made to obtain the temperature data in same direction at different height, the step pitch of stepper motor after rotating a circle
Angle should meet：
Wherein, k represents the ratio of the reference diameter and stepping motor gear reference diameter of the gear on bearing outer ring.
(2) split bearing should at least keep specified time to ensure that thermocouple measured temperature fills under each state
Divide and reaches stable state.
Illustratively, the section 0.9min to 1.1min of the specified time, that is, split bearing is under each state
0.9min to 1.1min should be at least kept, to ensure that thermocouple measured temperature sufficiently achieves stable state.
Due to the influence of the specific heat capacity of thermocouple temperature measurement contact itself, the thermoelectricity after bearing outer ring once rotate
Even thermometric can not reach stable state at once, but need the regular hour.Verification analysis is carried out according to some experimental results, is obtained
It can ensure that the thermometric numerical value of thermocouple reaches stable state when 0.9min is between 1.1min to the time.Preferably specified time is
1min。
Eight thermocouples are used in the present embodiment, distance is l between the twice bended point and side temperature contact of every thermocouple0
=3cm, and the height of each thermocouple temperature measurement is respectively h=0.1cm, 0.3cm, 1cm, 3cm, 6cm, 10cm, 17cm, 26cm,
And the difference between the inner ring internal diameter and outer ring outer diameter of split bearing is 0.78cm, the inflection point obtained in this way is surveyed with thermocouple
The distance between warm contact is 3.68cm, 3.48cm, 3.22cm, 5.22cm, 8.22cm, 12.22cm, 19.22cm, 28.22cm.
And due to using eight thermocouples, so the angle apart before every two thermocouples is 45 °, when stepper motor is received
To a pulse signal when, the angle that the periphery of split bearing is mobile is 45 °, makes the gear point of stepper motor in this example
It is 1 to spend the ratio between gear compound graduation circular diameter of circular diameter and split bearing:2, then a step angle of stepper motor is 90 °.
The front view and side view such as Figure of description 1 and 2 for the measuring apparatus that measurement method disclosed in the present embodiment uses
It is shown.
It, can be with due to using the temperature field around thermocouple measurement conducting wire in conclusion in the present embodiment
Greatly reduce the cost of equipment, the device used if measuring temperature field under normal circumstances such as infrared test or ultraviolet
Its cost of the equipment of imaging can greatly increase, and have many inconvenients applying also.Meanwhile in the present embodiment
In, carry out the temperature at the different location around measure traverse line using the rotation of stepper motor, thermocouple each in this way can be with
The temperature for measuring many places, reduces the usage quantity of thermocouple, not only reduces cost, and also simplify the complicated journey of device
Degree, the use in actually measuring are easier.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
1. a kind of method measuring overhead transmission line natural convection temperature field, which is characterized in that include the following steps:
S1, several thermocouples are formed into the colyliform thermocouple cluster that length differs, and is uniformly fixed on and is driven by stepper motor
Split bearing on；
The inner ring of the split bearing is fixed on conducting wire, by the outer ring of split bearing be fixed on inner ring periphery and determine it can
After well sliding, stepper motor is fixed on the outer ring of conducting wire；
The thermocouple, which later carries out it on fixed to the split bearing bending, keeps the thermocouple and conducting wire perpendicular,
And the length of the part bent should be determined according to the specific height for measuring position, and it is reserved under certain length l0,
So that thermocouple temperature measurement proximate contacts is carried out second opposite of bending of primary and first time overbending direction again, makes close to thermocouple
Thermocouple wire at thermometric contact is parallel with conducting wire；
S2, the split bearing outer ring, which are rotated a circle with a certain period around conducting wire, just to be obtained specifying orientation around conducting wire later, refer to
The Temperature Distribution of set a distance.
2. a kind of method measuring overhead transmission line natural convection temperature field according to claim 1, which is characterized in that
The thermocouple is uniformly fixed on different direction on the split bearing, each two thermocouple fixed point and conducting wire axial connecting line
Angle be θ, the quantity of the point that the angle theta measures as needed determines.
3. a kind of method measuring overhead transmission line natural convection temperature field according to claim 2, which is characterized in that
When the quantity of thermocouple in the colyliform thermocouple cluster is n roots, the angle of each two thermocouple and axial connecting line is：
4. a kind of method measuring overhead transmission line natural convection temperature field according to claim 1, which is characterized in that
The thermocouple temperature measurement contact is different at a distance from conducting wire axle center；If the thermocouple should measurement distance conducting wire upper table
Face height is the temperature field at h, and the difference of the inner ring internal diameter of the split bearing and outer ring outer diameter thickness is 2x, then the heat
Galvanic couple first time inflection point and the thermocouple temperature measurement contact between thermocouple length be：|h-x|+l0。
5. a kind of method measuring overhead transmission line natural convection temperature field according to claim 1, which is characterized in that
It is mutually obstructed without in kind between the thermocouple temperature measurement contact and conducting wire.
6. a kind of method measuring overhead transmission line natural convection temperature field according to claim 2, which is characterized in that
Split bearing outer ring angle of each pulse rotation under stepper motor driving is equal to the angle theta.
7. a kind of method measuring overhead transmission line natural convection temperature field according to claim 6, which is characterized in that
The step angle of the stepper motorMeet：
Wherein, k represents the ratio of the reference diameter and stepping motor gear reference diameter of the gear on split bearing outer ring.
8. a kind of method measuring overhead transmission line natural convection temperature field according to claim 1, which is characterized in that
The split bearing keeps specified time to ensure that the thermocouple measured temperature sufficiently achieves under each state
Stable state.
9. a kind of method measuring overhead transmission line natural convection temperature field according to claim 1, which is characterized in that
The section of the specified time is 0.9min to 1.1min.
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| CN204027732U (en) * | 2014-07-22 | 2014-12-17 | 深圳市特力康科技有限公司 | Transmission line wire temperature detection device |
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| US8247749B2 (en) * | 2009-07-04 | 2012-08-21 | Inductoheat, Inc. | Application of electric induction energy for manufacture of irregularly shaped shafts with cylindrical components including non-unitarily forged crankshafts and camshafts |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8573835B2 (en) * | 2009-09-30 | 2013-11-05 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Method and apparatus for measuring thermal conductivity of small, highly insulating specimens |
| CN102161167A (en) * | 2011-01-21 | 2011-08-24 | 华南理工大学 | Method and device of wirelessly outputting thermoelectric force signal for multi-point temperature measuring of rotator |
| CN201955174U (en) * | 2011-01-21 | 2011-08-31 | 华南理工大学 | Device applied to multi-point rotor temperature measurement |
| CN102680132A (en) * | 2011-03-17 | 2012-09-19 | 山东电力集团公司济宁供电公司 | Device and method for monitoring temperature and current carrying capacity of cable |
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| CN204027732U (en) * | 2014-07-22 | 2014-12-17 | 深圳市特力康科技有限公司 | Transmission line wire temperature detection device |
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