CN104897993B - A kind of overhead transmission line current-carrying capacity appraisal procedure - Google Patents
A kind of overhead transmission line current-carrying capacity appraisal procedure Download PDFInfo
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Abstract
The invention discloses a kind of overhead transmission line current-carrying capacity appraisal procedure, the mounted angle sensor on shaft tower, inclination angle is hung by wire and angle of wind deflection calculates conductor temperature, pass through temperature sensor measurement environment temperature and intensity of sunshine, by installing current sensor measurement wire Real-time Load on the line, combined influence of the microclimate conditions such as wind speed and direction to wire is represented using heat transfer coefficient, finally according to conductor temperature model, the real-time maximum carrying capacity for assessing wire is calculated.Present invention reduces the error of existing conductor temperature measuring method, the appliance arrangement set-up time is shortened, reduce data analysis complexity, it is to avoid the problem of wind speed and direction measurement is inaccurate, add the reliability of current carrying capacity of conductor calculating.
Description
Technical field
The present invention relates to power transmission network current-carrying capacity technical field, specifically a kind of overhead transmission line current-carrying capacity assessment side
Method.
Background technology
As China's economy is skyrocketed through, electricity needs rapidly rises, and from the seventies in last century, China just steps into
The situations of power shortages.Meanwhile, the construction of power transmission network again by construction period length, the first stage of investment is huge, expropriation of land is difficult, ring
The factors such as guarantor's problem are restricted, and especially on the nervous big and medium-sized cities periphery of land used, newly-built transmission line of electricity is extremely difficult.In this background
Under, improving existing electric network transportation ability turns into one of urgent problem to be solved.
For existing line, on the premise of not changing existing network structure and ensuring power grid security reliability service,
Assessed in real time according to ambient parameter (environment temperature, wind speed, wind direction, intensity of sunshine etc.), conductor temperature and the wire load of wire
The maximum carrying capacity of transmission line of electricity, can be on the basis of transmission line safety stable operation be ensured, increase line to greatest extent
Road-load flow, allows many newly-built circuits to postpone or not build temporarily, can largely alleviate the transmission of electricity after load abruptly increase
Bottleneck problem.
In existing transmission line of electricity current-carrying capacity assessment system, for conductor temperature, typically there are following several measuring methods:Pass through
Sensor direct measurement conductor temperature, because wire is typically very long, residing meteorological condition is not completely the same, therefore measures a certain
The temperature of point is difficult the samming for representing wire, and sensor surveys conductive line surfaces temperature there is also some errors with internal temperature;
By tension sensor measure traverse line tension force, conductor temperature is calculated using wire tension temperature foh curve, this method can be with
Wire samming is relatively accurately obtained, but power failure for a long time is needed in primary side installation tension meter, Operation of Electric Systems is caused
Certain influence;By imaging sensor measure traverse line sag, conductor temperature is tried to achieve using sag temperature curve, this method is only needed
Several cameras are installed below wire, but amount of calculation is larger in image procossing and there is certain error.For wire current-carrying
Computation model is measured, climate model is used existing assessment system more, but the selection of weather conditions is more general, it is and micro- residing for wire
It is generally large to there is wind speed wind vector in certain deviation, and required calculating parameter in weather conditions, it is difficult to accurate measurement.
Therefore the system calculates conductor temperature using obliquity sensor, based on conductor temperature model, utilizes heat transfer coefficient
The combined influence of environment temperature, wind speed and direction to wire is represented, using temperature sensor measurement environment temperature and intensity of sunshine, is led to
The current sensor measurement load current of hanging wire is crossed, assesses and leads using conductor temperature, environment temperature, intensity of sunshine, load current
The real-time current-carrying capacity of line, equipment install convenient, without measuring wind speed and direction, it is to avoid wind speed and direction indeterminable problem, are improved
Calculate accuracy.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is proposed that one kind is based on wire microclimate condition
The overhead transmission line current-carrying capacity real time evaluating method of (environment temperature, intensity of sunshine) and wire measurement of dip angle.
The principle of the present invention:
The current-carrying capacity of overhead transmission line mainly with the wire itself such as environmental factor and conductor temperature, conductor material size
Factor is relevant.It calculates the main steady-state heat balance equation according to wire, as follows
Qr+Qf=Qs+I2Rt' (1)
Wherein QrFor heat loss through radiation power, QfFor heat loss through convection power, QsFor sunshine Endothermic power, I2Rt' exchanged for wire
The heating power of resistance.After it is determined that wire type is wire parameters, the physical significance of four kinds of power and calculating in (1) formula
It is as follows.
Heat loss through radiation power QrThe heat radiation power of conductive line surfaces is illustrated, with wire inherent parameters, conductor temperature Tc, ring
Border temperature TaRelevant, specific calculate sees below formula.
Qr=π DE1S1[(Tc+273)4-(Ta+273)4] (2)
Wherein, D is wire diameter;E1For the heat-radiation heat-dissipating coefficient of conductive line surfaces, in China's standard, 0.9 is typically taken;S1
For Si Tefan-Bao Erciman constants, 5.67 × 10 are taken-8, W/m2;Ta、TcFor conductor temperature and environment temperature, DEG C.
Sunshine Endothermic power QsThe power of wire counterglow radiation absorption is illustrated, is had with the size and intensity of sunshine of wire
Close.
Qs=αSJSD (3)
Wherein, αSIt is typically equal with wire radiation coefficient in China's standard for the heat absorption coefficient of conductive line surfaces;JsFor sunshine
Intensity, for the sake of guarding, in China's standard, is typically taken as 1000W/m2。
The heating power I of wire AC resistance2Rt' by wire stable state current-carrying capacity I and wire AC resistance calculate and
Come, conductor temperature is TcWhen AC resistance R (Tc) and conductor temperature TcIt is relevant:
R(Tc)=(1+k) R20[1+α20(Tc-20)] (4)
Wherein, k is the skin effect coefficient of wire, relevant with the cross-sectional area of wire, when cross-sectional area is not more than
400mm2When, take k=0.0025 to be more than 400mm2When, take k=0.01;R20Material temperature coefficient during for 20 DEG C of wire, for
Aluminum, can take 0.00403/ DEG C.
Heat loss through convection power QfBy conductor temperature Tc, environment temperature TaCalculated with heat transfer coefficient h (t), such as following formula.
Qf=h (t) (Tc-Ta) (5)
Wherein, heat transfer coefficient h (t) illustrates the combined influence of environment temperature, wind speed, wind direction to heat loss through convection power,
Not accurate enough when being in the measurement of wind speed and direction, conductor temperature model can avoid the error that it brings well.
In known lead current loads electric current I0, conductor temperature Tc, environment temperature Ta, intensity of sunshine JSWith wire itself ginseng
, can be by bringing following formula into and calculating h (t) (2), (3), (4) formula during number.
When the wind speed change of environment temperature is little, heat transfer coefficient h (t) change is extremely small, substantially thousand/
Within one.Corresponding heat transfer coefficient when therefore can take conductor temperature for maximum allowable temperature 70 C.
The technical solution of the present invention is as follows:
A kind of overhead transmission line current-carrying capacity appraisal procedure, its feature is that this method comprises the following steps:
Step S1, the side of wire mounted angle sensor on steel tower, to be hung in measure traverse line upright projection plane
Inclination angle thetaAWith angle of wind deflection η;Current sensor is hung on wire, the load current I to measure traverse line0;Temperature is installed on steel tower
Sensor is spent, to measuring environment temperature TaWith intensity of sunshine Js;
Step S2, chooses Lead status when wire is unloaded, load current is zero I=0 as original state, i.e., known shape
State, environment temperature is measured for T using temperature sensora0, conductor temperature now should be equal to environment temperature, i.e. Tc0=Ta0, utilize
Initial suspension inclination angle theta in obliquity sensor measure traverse line upright projection planeA0With initial angle of wind deflection η0;
In wire normal operating condition, that is, state to be asked when load current is not zero, measures real-time using obliquity sensor
Wire hangs inclination angle thetaA1With real-time angle of wind deflection η1, it is T using temperature sensor measurement real time environment temperaturea1;
Step S3, calculates the wire horizontal stress σ of initial and real-time status0And σ1, formula is as follows:
In formula, θA0And θA1For initial and real-time status the suspension inclination angle of wire, l is line span, and β is high angular difference, can be
Found in the design parameter of this circuit, γvTo be vertical than carrying, calculated by following formula
Wherein, q is unit length wire quality, and S is sectional area of wire;
Step S4, calculates the wire of initial and real-time status comprehensively than carrying γ0And γ1, formula is as follows:
In formula, η0And η1For the wire angle of wind deflection of original state and real-time status;
Step S5, calculates wire real time temperature Tc1, formula is as follows:
Wherein, σ0And σ1For the horizontal stress of initial and real-time status;γ0And γ1Wire for initial and real-time status is comprehensive
Composition and division in a proportion is carried;η0And η1For the wire angle of wind deflection of initial and real-time status;Tc0And Tc1For the conductor temperature under initial and real-time status;
α is conductor temperature linear expansion coefficient;E is coefficient of elasticity;
Step S6, utilizes the Real-time Load I of current sensor measurement wire0, it is real-time using temperature sensor measurement wire
Environment temperature Ta1And intensity of sunshine Js, the wire heat transfer coefficient h (t) of current environmental condition is calculated, formula is as follows:
In formula, I0For wire Real-time Load electric current, Tc1、Ta1For wire real time temperature and environment real time temperature, R (Tc1) lead
Line temperature is Tc1When AC resistance, Qr(Tc1,Ta1) it is heat loss through radiation power, QsFor sunshine Endothermic power;
Step S7, with wire maximum permissible temperature TmaxReplace wire real time temperature Tc, calculate current state lower wire maximum
Current-carrying capacity Imax, formula is as follows:
According to China code wire maximum permissible temperature TmaxFor 70 DEG C or 80 DEG C.
Compared with prior art, the beneficial effects of the invention are as follows:
1) wire temperature is obtained by the suspension inclination angle and angle of wind deflection of crossing the obliquity sensor measure traverse line being arranged at shaft tower
Degree, by temperature sensor measurement environment temperature and intensity of sunshine, by installing current sensor measurement wire on the line
Real-time Load, finally brings conductor temperature, load, environment temperature and intensity of sunshine into conductor temperature model real-time to assess wire
Peak load, improves the precision of conductor temperature calculating.
2) error of existing conductor temperature measuring method is reduced, data analysis complexity is reduced, wire load is added
The reliability of flow rate calculation.
3) the appliance arrangement set-up time is shortened, it is to avoid equipment, which to be installed, have a power failure for a long time and wind speed and direction measures inaccurate
The problem of, have a good application prospect.
Brief description of the drawings
Fig. 1 is scheme of installation of the present invention;
Fig. 2 is the not contour overhead transmission line windage yaw force diagram of hitch point;
Fig. 3 is overhead transmission line current-carrying capacity evaluation process schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
A kind of overhead transmission line current-carrying capacity appraisal procedure, comprises the following steps:
Step S1, as shown in figure 1, the side of wire mounted angle sensor on steel tower, to measure the outstanding of wire in Fig. 2
Hang inclination angle thetaAWith angle of wind deflection η;Current sensor is suspended on wire, the load current I of measure traverse line0;Temperature sensor is arranged on
On steel tower, measuring environment temperature TaWith intensity of sunshine Js。
Step S2, chooses wire zero load, i.e., Lead status when load current is zero (I=0) is (known as original state
State), environment temperature is measured for T using temperature sensora0, conductor temperature now should be equal to environment temperature, i.e. Tc0=Ta0,
Utilize initial suspension inclination angle theta in obliquity sensor measure traverse line upright projection planeA0With initial angle of wind deflection η0;
In wire normal operating condition (state to be asked), i.e., when load current is not zero, measure real using obliquity sensor
When wire suspension inclination angle thetaA1With real-time angle of wind deflection η1, it is T using temperature sensor measurement real time environment temperaturea1;
Step S3, calculates the wire horizontal stress σ of initial and real-time status0And σ1, formula is as follows:
In formula, θA0And θA1For initial and real-time status the suspension inclination angle of wire, l is line span, and β is high angular difference, is such as schemed
Shown in 2, it can be found in the design parameter of this circuit;γvTo be vertical than carrying, calculated by following formula
Wherein, q is unit length wire quality;S is sectional area of wire;
Step S4, calculates the wire of initial and real-time status comprehensively than carrying γ0And γ1, formula is as follows:
In formula, η0And η1For the wire angle of wind deflection of original state and real-time status;
Step S5, calculates wire real time temperature Tc1, formula is as follows:
Wherein, σ0And σ1For the horizontal stress of initial and real-time status;γ0And γ1Wire for initial and real-time status is comprehensive
Composition and division in a proportion is carried;η0And η1For the wire angle of wind deflection of initial and real-time status;Tc0And Tc1For the conductor temperature under initial and real-time status;
α is conductor temperature linear expansion coefficient;E is coefficient of elasticity.
Step S6, utilizes the Real-time Load I of current sensor measurement wire0, it is real-time using temperature sensor measurement wire
Environment temperature Ta1And intensity of sunshine Js, the wire heat transfer coefficient h (t) of current environmental condition is calculated, formula is as follows:
In formula, I0For wire Real-time Load electric current, Tc1, Ta1For wire real time temperature and environment real time temperature, R (Tc1) lead
Line temperature is Tc1When AC resistance, Qr(Tc1,Ta1) it is heat loss through radiation power, QsFor sunshine Endothermic power;
Step S7, with wire maximum permissible temperature TmaxReplace wire real time temperature Tc, take in the present embodiment the conductor temperature to be
Corresponding heat transfer coefficient during maximum allowable temperature 70 C,
h70(t)≈h(t)
Calculate current state lower wire maximum carrying capacity Imax, formula is as follows:
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although ginseng
The present invention is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to invention
Technical scheme is modified or equivalent, and without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (1)
1. a kind of overhead transmission line current-carrying capacity appraisal procedure, it is characterised in that this method comprises the following steps:
Step S1, the side of wire mounted angle sensor on steel tower, to hang inclination angle theta in measure traverse line upright projection planeA
With angle of wind deflection η;Current sensor is hung on wire, the load current I to measure traverse line0;Temperature is installed on steel tower to pass
Sensor, to measuring environment temperature TaWith intensity of sunshine Js;
Step S2, chooses Lead status when wire is unloaded, load current is zero I=0 as original state, i.e. known state,
Environment temperature is measured for T using temperature sensora0, conductor temperature now should be equal to environment temperature, i.e. Tc0=Ta0, using inclining
Initial suspension inclination angle theta in angle transducer measure traverse line upright projection planeA0With initial angle of wind deflection η0;
In wire normal operating condition, that is, when load current is not zero, real-time wire is measured using obliquity sensor for state to be asked
Hang inclination angle thetaA1With real-time angle of wind deflection η1, it is T using temperature sensor measurement real time environment temperaturea1;
Step S3, calculates the wire horizontal stress σ of initial and real-time status0And σ1, formula is as follows:
In formula, θA0And θA1For initial and real-time status the suspension inclination angle of wire, l is line span, and β is high angular difference, can be at this
Found in the design parameter of circuit, γvTo be vertical than carrying, calculated by following formula
Wherein, q is unit length wire quality, and S is sectional area of wire;
Step S4, calculates the wire of initial and real-time status comprehensively than carrying γ0And γ1, formula is as follows:
In formula, η0And η1For the wire angle of wind deflection of original state and real-time status;
Step S5, calculates wire real time temperature Tc1, formula is as follows:
Wherein, σ0And σ1For the horizontal stress of initial and real-time status;γ0And γ1Comprehensively compare for the wire of initial and real-time status
Carry;η0And η1For the wire angle of wind deflection of initial and real-time status;Tc0And Tc1For the conductor temperature under initial and real-time status;α is
Conductor temperature linear expansion coefficient;E is coefficient of elasticity;
Step S6, utilizes the Real-time Load I of current sensor measurement wire0, utilize temperature sensor measurement wire real time environment temperature
Spend Ta1And intensity of sunshine Js, the wire heat transfer coefficient h (t) of current environmental condition is calculated, formula is as follows:
In formula, I0For wire Real-time Load electric current, Tc1、Ta1For wire real time temperature and environment real time temperature, R (Tc1) conductor temperature
For Tc1When AC resistance, Qr(Tc1,Ta1) it is heat loss through radiation power, QsFor sunshine Endothermic power;
Step S7, with wire maximum permissible temperature TmaxReplace wire real time temperature Tc1, calculate the maximum current-carrying of current state lower wire
Measure Imax, formula is as follows:
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