CN106225942A - A kind of method measuring overhead transmission line natural convection temperature field - Google Patents
A kind of method measuring overhead transmission line natural convection temperature field Download PDFInfo
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- CN106225942A CN106225942A CN201610668081.1A CN201610668081A CN106225942A CN 106225942 A CN106225942 A CN 106225942A CN 201610668081 A CN201610668081 A CN 201610668081A CN 106225942 A CN106225942 A CN 106225942A
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- thermocouple
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- transmission line
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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
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Abstract
The invention discloses a kind of method that colyliform thermocouple bunch using stepper motor driven split bearing fixing measures overhead transmission line natural convection temperature field, mainly comprise the following steps: S1, some thermocouples are formed colyliform thermocouples bunch, and be uniformly fixed on split bearing driven by stepper motors.Each thermocouple temperature measurement contact is inconsistent with the distance of wire, be used for measure with wire different distance at temperature of thermal field.S2, split bearing outer ring just obtain specifying around wire orientation, the Temperature Distribution of distance to a declared goal with a certain cycle after wire rotates a circle.The present invention has considered the multiple knowledge such as power overhead network thermo parameters method, measurement technology and Engineering Thermophysics, it is possible to can try one's best again on the premise of more accurate measurement bay ceases to be busy temperature field surrounding distribution situation does not affect its original Temperature Distribution.
Description
Technical field
The present invention relates to the thermometry of thermocouple, motor drag principle, overhead power transmission line technology and and the hot thing of engineering
The technical field that reason is relevant, is specifically related to a kind of colyliform thermocouple bunch using stepper motor driven split bearing fixing and measures
The method of overhead transmission line natural convection temperature field.
Background technology
General overhead transmission line is all it suffices that the equation of heat balance of following form:
QR+Qt=Ql+Qf (1)
Wherein, QRRepresent the Joule heat that unit length conductor produces, 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.
Owing to 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 is as follows:
It will be seen that the current-carrying capacity of wire and the heat absorption of wire and dispel the heat in close relations relevant from formula (3), increase is led
One important method of body current-carrying capacity is exactly the heat dissipation capacity increasing conductor, and most importantly to wandering in the heat radiation of aerial line
Heat, therefore studies the current-carrying capacity to lifting lead wire to heat loss through convection situation and has great importance.
In the middle of current research, the free convection situation of wire is concentrated mainly on the convection current of wire and the surface of wire
The relation research of temperature, the research being related to wire temperature field surrounding is concentrated mainly on emulation and numerical computations aspect.And in reality
In the middle of the aerial line on border runs, it is especially considering that the double bundle conductor of non-installation interval rod runs central, the temperature between wire
Degree impact is a highly important research topic, and the wire of actual motion is sufficiently complex due to its residing environment, passes through
The temperature field situation that Theoretical Calculation obtains tends not to meet requirement, therefore the nearly thermo parameters method research experiment to wire
Extremely being necessary, the most just the nearly temperature field for aerial line is monitored and is provided a kind of monitoring method feasible, convenient.
Summary of the invention
The invention aims to overcome and prior art is measured the measurement table that built on stilts temperature of electric transmission line is commonly used
Surface temperature and the shortcoming that ignores nearly temperature profile effect, it is provided that a kind of side measuring overhead transmission line natural convection temperature field
Method, the measurement temperature field mode that the method is used is greatly reduced than infrared thermography method cost, has good economy
Property.
The purpose of the present invention can reach by adopting the following technical scheme that:
A kind of method measuring overhead transmission line natural convection temperature field, comprises the following steps:
S1, the colyliform thermocouple bunch that some thermocouple composition length are differed, and be uniformly fixed on by motor
On the split bearing driven；
S2, described split bearing outer ring just obtain designated parties around wire with a certain cycle after wire rotates a circle
Position, the Temperature Distribution of distance to a declared goal.
Further, described thermocouple is uniformly fixed on described split bearing with different azimuth, and each two thermocouple is solid
Fixed point is θ with the angle of wire axial connecting line, and the quantity of the point that described angle theta is measured as required determines.
Further, when in described colyliform thermocouple bunch, the quantity of thermocouple is n root, each two thermocouple is with axle center even
The angle of line is:
Further, described thermocouple carries out bending to it after being fixed on described split bearing and makes described thermocouple
Perpendicular with wire, and the length of the part bent should determine according to the concrete height measuring position, and stay in advance
Certain length l0, make thermocouple side temperature proximate contacts again carry out once the second time contrary with first time overbending direction curved
Folding, makes the thermocouple wire at the temperature contact of thermocouple side parallel with wire.
Further, described thermocouple side temperature contact is different with the distance in wire axle center；If described thermocouple should
When measurement height is the temperature field at h, and the inner ring internal diameter of described split bearing and outer ring external diameter thickness are 2x, then described heat
A length of between galvanic couple inflection point and described thermocouple side temperature contact: | h-x |+l0。
Further, material object is not had to intercept mutually between described thermocouple side temperature contact and wire.
Further, the described split bearing outer ring angle that each pulse rotates under step motor drive is equal to described folder
Angle θ.
Further, the step angle of described motorMeet:
Wherein, k represents reference diameter and the stepping motor gear reference diameter of the gear on split bearing outer ring
Ratio.
Further, described split bearing keeps the appointment time to ensure that described thermocouple is surveyed under each state
Temperature sufficiently achieves stable state.
Further, the interval of described appointment time is 0.9min to 1.1min.
The present invention has such advantages as relative to prior art and effect:
1) in the present invention, owing to using the temperature field around thermocouple measurement wire, therefore can greatly reduce
The cost of equipment, if measuring setting of the device such as infrared test or ultraviolet imagery of temperature field employing in the ordinary course of things
Its cost standby can be greatly increased, and also has a lot of inconvenient using.
2) rotation using motor in the present invention carrys out the temperature of the various location around measure traverse line, this
The each thermocouple of sample can measure the temperature of many places, decreases the usage quantity of thermocouple, not only reduces cost, but also simple
Having changed the complexity of device, the use in reality is measured is easier.
Accompanying drawing explanation
Fig. 1 is the front view of the equipment that the colyliform thermocouple bunch under step motor drive measures free convection in the present invention；
Fig. 2 is the side view of the equipment that the colyliform thermocouple bunch under step motor drive measures free convection in the present invention；
Fig. 3 is the flow chart of a kind of method measuring overhead transmission line natural convection temperature field disclosed by the invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Referring to Fig. 3, 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 colyliform thermocouple bunch using stepper motor driven split bearing fixing shown in Fig. 3 is measured built on stilts
The method of transmission line of electricity natural convection temperature field, specifically includes following steps:
S1, the colyliform thermocouple bunch that some thermocouple composition length are differed, and be uniformly fixed on by motor
On the split bearing driven；
(1) thermocouple is uniformly fixed on split bearing with different azimuth, each two thermocouple fixing point and wire axle center
The angle of line is θ；
The quantity of the point that the particular location that thermocouple should be fixed is measured as required determines, when taking n in this patent
During root thermocouple, each two thermocouple with the angle of axial connecting line is:
(2) temperature contact in thermocouple side is different with the distance in wire axle center；
In concrete application, every thermocouple being fixed on split bearing after should to its carry out bending make thermocouple and
Wire is perpendicular, and the length of the part bent should determine according to the concrete height measuring position, and should reserve
The most certain length l0, l0Major significance be to make the proximate contacts of thermocouple again carry out once with first time overbending direction
Contrary second time bending, (concrete condition is shown in explanation to make the thermocouple wire at the temperature contact of thermocouple side parallel with wire
Side view in book accompanying drawing).If certain root thermocouple should measure height for the temperature field at h, and in the inner ring of split bearing
Footpath and outer ring external diameter thickness are 2x, then a length of between thermocouple inflection point and thermocouple side temperature contact: | h-x |+l0, root
Obtain the position of inflection point of thermocouple wire according to this formula, then measure with thermocouple side temperature contact apart for l0Secondary curved
Break, and carry out labelling.
(3) split bearing is by step motor drive；
In concrete application, the inner ring of this split bearing is fixed on wire, is fixed on outside inner ring the outer ring of split bearing
Enclose and determine after it can well slide, motor is fixed on the outer ring of wire.
(4) not having other material object to intercept mutually between thermocouple side temperature contact and wire, thermocouple cold junction passes through its other party
Formula is connected with temperature display meter.
Fix at split bearing, motor, and after all of thermocouple wire is carried out twice bending, will
Thermocouple wire is fixed on the outer peripheral surface of split bearing on the most labeled good position, can be with nylon rope or other elements
By its bondage on bearing outer ring, and ensure just to be fixed on the outer surface of bearing outer ring an all of inflection point.
So thermocouple wire after twice bended point is parallel with wire, and and an inflection point and twice bended point between thermocouple wire
Perpendicular, it can be ensured that not have other object (such as thermocouple wire) to disturb between point for measuring temperature and the wire of thermocouple, significantly carry
The high accuracy measured.
S2, split bearing outer ring just obtain specifying orientation around wire, referring to a certain cycle after wire rotates a circle
The Temperature Distribution of set a distance；
(1) the split bearing outer ring angle that each pulse rotates under step motor drive is equal to θ；
In concrete application, in order to make motor be θ in the outer ring anglec of rotation of the effect lower bearing of each pulse, i.e.
Bearing outer ring can be made in the temperature data obtained afterwards on same direction at differing heights that rotates a circle, the step pitch of motor
Angle it suffices that:
Wherein, k represents the reference diameter of the gear on bearing outer ring and the ratio of stepping motor gear reference diameter.
(2) split bearing should at least keep the appointment time to ensure that thermocouple measured temperature fills under each state
Divide and reach stable state.
Exemplary, the interval 0.9min to 1.1min of described appointment time, i.e. split bearing is under each state
Should at least keep 0.9min to 1.1min, to ensure that thermocouple measured temperature sufficiently achieves stable state.
Due to the impact of the specific heat capacity of thermocouple side temperature contact itself, the thermoelectricity after bearing outer ring once rotates
Even thermometric can not reach stable state at once, but needs the regular hour.Analyze according to some experimental results being carried out checking,
To the time between 0.9min to 1.1min time can ensure that the thermometric numerical value of thermocouple reaches stable state.The preferably appointment time is
1min。
Using eight thermocouples in the present embodiment, the twice bended point of every thermocouple and the spacing of side temperature contact are l0
=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 of split bearing and outer ring external diameter is 0.78cm, the inflection point so obtained and thermocouple side
Distance between temperature contact is 3.68cm, 3.48cm, 3.22cm, 5.22cm, 8.22cm, 12.22cm, 19.22cm, 28.22cm.
And owing to using eight thermocouples, so the angle apart before every two thermocouples is 45 °, when motor is received
During to the signal of a pulse, the angle of the peripheral movement of split bearing is 45 °, makes the gear of motor divide in this example
Degree circular diameter is 1:2 with the ratio of the gear compound graduation circular diameter of split bearing, then a step angle of motor is 90 °.
The front view of the measurement equipment that measuring method disclosed in the present embodiment uses and side view such as Figure of description 1 and 2
Shown in.
In sum, in the present embodiment, owing to using the temperature field around thermocouple measurement wire, the most permissible
Greatly reduce the cost of equipment, if measuring device such as infrared test or ultraviolet that temperature field uses in the ordinary course of things
Its cost of the equipment of imaging can be greatly increased, and also has a lot of inconvenient using.Meanwhile, at the present embodiment
In, the rotation using motor carrys out the temperature of the various location around measure traverse line, and the most each thermocouple is permissible
Measure the temperature of many places, decrease the usage quantity of thermocouple, not only reduce cost, but also simplify the complicated journey of device
Degree, the use in reality is measured is easier.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (10)
1. the method measuring overhead transmission line natural convection temperature field, it is characterised in that comprise the following steps:
S1, the colyliform thermocouple bunch that some thermocouple composition length are differed, and be uniformly fixed on by step motor drive
Split bearing on；
S2, described split bearing outer ring just obtain specifying orientation around wire, referring to a certain cycle after wire rotates a circle
The Temperature Distribution of set a distance.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 1, it is characterised in that
Described thermocouple is uniformly fixed on described split bearing with different azimuth, each two thermocouple fixing point and wire axial connecting line
Angle be θ, the quantity of the point that described angle theta is measured as required determines.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 2, it is characterised in that
When in described colyliform thermocouple bunch, the quantity of thermocouple is n root, each two thermocouple with the angle of axial connecting line is:
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 1, it is characterised in that
Described thermocouple carries out bending to it after being fixed on described split bearing makes described thermocouple perpendicular with wire, and curved
The length of the part of folding should determine according to the concrete height measuring position, and reserved under certain length l0, make heat
Galvanic couple side temperature proximate contacts carries out once the second time bending contrary with first time overbending direction again, makes near thermocouple side temperature
Thermocouple wire at contact is paralleled with wire.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 4, it is characterised in that
Described thermocouple side temperature contact is different with the distance in wire axle center；If described thermocouple should be measured at highly for h
Temperature field, and the inner ring internal diameter of described split bearing and outer ring external diameter thickness are 2x, then described thermocouple inflection point is with described
A length of between the temperature contact of thermocouple side: | h-x |+l0。
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 4, it is characterised in that
Material object is not had to intercept mutually between described thermocouple side temperature contact and wire.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 2, it is characterised in that
The described split bearing outer ring angle that each pulse rotates under step motor drive is equal to described angle theta.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 7, it is characterised in that
The step angle of described motorMeet:
Wherein, k represents the reference diameter of the gear on split bearing outer ring and the ratio of stepping motor gear reference diameter.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 1, it is characterised in that
Described split bearing keeps the appointment time to ensure that described thermocouple measured temperature sufficiently achieves under each state
Stable state.
A kind of method measuring overhead transmission line natural convection temperature field the most according to claim 1, its feature exists
In,
The interval of described appointment time is 0.9min to 1.1min.
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| CN201610668081.1A CN106225942B (en) | 2016-08-15 | 2016-08-15 | A method of measuring overhead transmission line natural convection temperature field |
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| CN201610668081.1A CN106225942B (en) | 2016-08-15 | 2016-08-15 | A method of measuring overhead transmission line natural convection temperature field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049124A (en) * | 2021-02-08 | 2021-06-29 | 国网河北省电力有限公司衡水供电分公司 | Wire temperature measuring device |
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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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| US20110000905A1 (en) * | 2009-07-04 | 2011-01-06 | Doyon Gary A | 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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| CN113049124A (en) * | 2021-02-08 | 2021-06-29 | 国网河北省电力有限公司衡水供电分公司 | Wire temperature measuring device |
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