CN102168962A - Optimized method for estimating ice coating thickness of electric transmission line - Google Patents

Abstract

The invention discloses an optimized method for estimating the ice coating thickness of an electric transmission line. The method comprises the following steps of: setting the tension value of a lead in the absence of ice coating as a basic lead tension value; correcting the basic lead tension value by taking the local environment and an ice coating historic record as basic lead tension corrected values; acquiring a real-time tension value of a lead of the electric transmission line; estimating the ice coating thickness of the lead according to the basic tension corrected values and the real-time tension value; and performing tendency optimization on an estimated lead ice coating thickness according to the historic ice coating thickness record to obtain the ice coating thickness of the lead. By adopting the method, the current ice coating state of the line can be estimated by acquiring the line state through a sensor erected on a pole tower, so that ice melting disaster relief work can be performed in time.

Description

A kind of electric power line ice-covering thickness evaluation method of optimization

Technical field

The present invention relates to the ultra-high-tension power transmission line monitoring technical field.

Background technology

The large tracts of land freezing disaster that continues of 50 years one chances has taken place in China south at the beginning of 2008, has had a strong impact on national economy and people's lives.Because setting up the zone, most of ultra-high-tension power transmission line all belongs to the high and cold high altitude localities that line attendant is difficult to the line walking maintenance, in order under the situation that personnel are difficult to arrive, to grasp the ice coating state of circuit immediately, in time carry out de-icing work, the urgent need invention is a kind of can be to the method for estimating of electric power line ice-covering thickness.

Summary of the invention

The objective of the invention is to fill up the blank of prior art, a kind of ice covering thickness that can obtain ultra-high-tension power transmission line immediately is provided, and reflect the ice covering thickness variation tendency truly, so that in time carry out the electric power line ice-covering thickness evaluation method of a kind of optimization of de-icing work.

The present invention seeks to be achieved through the following technical solutions.

A kind of electric power line ice-covering thickness evaluation method of optimization, this method may further comprise the steps:

A, when setting no icing the wire tension value as the basic value of thrust of lead;

B, with local environment and icing historical record as lead basis pulling force modified value, lead basis value of thrust is revised;

C, obtain the real-time value of thrust of transmission line wire;

D, according to basic pulling force modified value and real-time value of thrust, estimation wire icing thickness;

E, the wire icing thickness that writes down estimation according to historical ice covering thickness carry out trend optimization, obtain wire icing thickness.

Local environment of the present invention refers to local weather environment and geographical environment; Weather environment comprises temperature humidity, wind speed and direction, rainfall snowfall; Geographical environment comprises shaft tower circuit height above sea level, topography and geomorphology.Described icing historical record comprises the wire tension data of icing time of origin date, local environment, wire icing thickness, correspondence.

The invention has the beneficial effects as follows, can obtain line status and estimate the current ice coating state of circuit, combat a natural disaster work so that in time carry out ice-melt by being erected at sensor on the shaft tower.

Further set forth content of the present invention below in conjunction with Figure of description.

Description of drawings

Fig. 1 is for calculating insulator angle of wind deflection method geometric view;

Fig. 2 is that unit length ice coating wire diameter and ice covering thickness calculate synoptic diagram;

Fig. 3 calculates synoptic diagram for ice covering thickness;

Fig. 4 is trend evaluation method figure;

Fig. 5 is lead basis pulling force modified value evaluation method figure;

Fig. 6 is the evaluation method general flow chart;

Fig. 7 to Fig. 6 is the evaluation method process flow diagram.

Embodiment

A kind of electric power line ice-covering thickness evaluation method of optimization, the inventive method such as Fig. 6, shown in Figure 7 may further comprise the steps:

A, when setting no icing the wire tension value as the basic value of thrust of lead;

B, with local environment 1 and icing historical record 2 as lead basis pulling force modified value 3, lead basis value of thrust is revised;

C, by being erected at the transmission pressure pulling force sensor on the shaft tower, obtain the real-time value of thrust of transmission line wire;

D, lead basis value of thrust is revised, according to basic pulling force modified value and value of thrust in real time, estimation wire icing thickness.Modified value proposes according to local environment and icing historical record.As shown in Figure 5, local environment 1 has comprised local weather environment 1.1 and geographical environment 1.2, wherein local weather environment 1.1 comprises temperature humidity 1.1.1, wind speed and direction 1.1.2, rainfall snowfall 1.1.3, and geographical environment 1.2 comprises shaft tower circuit height above sea level 1.2.1, topography and geomorphology 1.2.2.Described icing historical record 2 has comprised icing time of origin date 2.1, local environment 1, wire icing thickness 2.2, corresponding wire tension data 2.3.Historical two factors of comprehensive local environment and icing, lead basis value of thrust is proposed modified value, make its can same transmission line of electricity of accurate response in by the isolated every section lead of shaft tower, under the situation of no icing, under different geographical environments, climatic environment condition, according to the icing historical record, different basic pulling force modified values is proposed.

E, the wire icing thickness that writes down estimation according to historical ice covering thickness carry out trend optimization, obtain wire icing thickness.

1. if local temperature smaller or equal to 0 °, humidity greater than 80%, suppose that then lead has begun icing, begins to estimate wire icing thickness.

The estimation flow process is as follows:

As Fig. 1,

Be the angle of insulator chain along the line direction;

Angle for insulator chain vertical line direction; Angle of wind deflection for insulator chain; The O point is the hitch point of insulator; OA represents insulator; AX represents lead; OG represents gravity direction; AY represents the lead vertical direction; GXAY represents rectangular virtual plane.By being erected at the sensor on the high-voltage transmission line pole tower, obtain two parameters in suitable line angular separation and vertical line angular separation of insulator chain, calculate the angle of wind deflection θ of insulator chain:

$\mathrm{\θ}=90-\mathrm{ArcCos}\left(\sqrt{{\mathrm{Cos}}^2\left({\mathrm{\θ}}_x\right)+{\mathrm{Cos}}^2\left({\mathrm{\θ}}_y\right)}\right)$

As Fig. 2, Fig. 3, G _JjBe gold utensil weight, F _ScFor surveying comprehensive value of thrust, G _FdBe ice coating wire weight, according to gold utensil weight G _Jj, π is circular constant, G _DmBe lead unit weight, φ ₀Be the lead initial diameter, ρ is an icing density.Survey comprehensive value of thrust F _ScDerivation obtains ice coating wire weight G _Fd

G _fd＝F _sc×cosθ-1/2G _jj

Bring the vertical range L of lead two ends shaft tower into _CzWith lead division number DXFLS, obtain ice coating wire unit weight G _Fdm:

G _fdm＝G _fd/L _cz/DXFLS

With ice coating wire unit weight G _Fdm, lead unit weight G _Dm, lead initial diameter φ ₀, the icing density p (adopts 900Kg/m ³) bring the ice covering thickness computing formula into

$H_{\mathrm{fb}}=\sqrt{{\left(\frac{{\mathrm{\φ}}_0}{2}\right)}^2+\frac{(G_{\mathrm{fdm}}-G_{\mathrm{dm}})}{\mathrm{\π\ρ}}\×{10}^6}-\frac{{\mathrm{\φ}}_0}{2}$

Obtain ice covering thickness H _Fb

2. the estimation result is carried out trend optimization.Powerline ice-covering has two stages, in the icing build phase, As time goes on the ice covering thickness of transmission line of electricity builds up, ice covering thickness is presented as one section curve that smoothly makes progress on trend map, after arrival deices the stage, by the peak value vanishing, ice covering thickness is presented as one section vertical straight line to ice covering thickness on trend map on a time point, reflects the icing rising tendency and the ice covering thickness that goes out with the data estimation of certain Fixed Time Interval pick-up transducers can't be truly level and smooth.Therefore, need to carry out trend analysis in conjunction with the last ice covering thickness that estimates, the estimation end value smooth optimization with discrete electric power line ice-covering thickness enables the actual electric power line ice-covering thickness variation tendency of actual response.Concrete trend analysis flow process is as follows: ice covering thickness estimation result analytically, if last ice covering thickness is non-vanishing, or local temperature smaller or equal to 0 °, humidity greater than 80%, then carry out this time estimation, otherwise judge that current icing is zero.

Fig. 4 has represented icing trend evaluation method.

Fig. 5 has represented the reference factor of pulling force modified value.

Fig. 6 with the trend calculation mode complete represented the ice covering thickness evaluation method.

Fig. 7 has represented the flow process of trend estimation.

Claims (3)

1. the electric power line ice-covering thickness evaluation method of an optimization is characterized in that, this method may further comprise the steps:

A, when setting no icing the wire tension value as the basic value of thrust of lead;

B, with local environment (1) and icing historical record (2) as lead basis pulling force modified value (3), lead basis value of thrust is revised;

C, obtain the real-time value of thrust of transmission line wire;

D, according to basic pulling force modified value and real-time value of thrust, estimation wire icing thickness;

E, the wire icing thickness that writes down estimation according to historical ice covering thickness carry out trend optimization, obtain wire icing thickness.

2. the electric power line ice-covering thickness evaluation method of a kind of optimization according to claim 1 is characterized in that, described local environment (1) refers to local weather environment (1.1) and geographical environment (1.2); Weather environment (1.1) comprises temperature humidity (1.1.1), wind speed and direction (1.1.2), rainfall snowfall (1.1.3); Geographical environment (1.2) comprises shaft tower circuit height above sea level (1.2.1), topography and geomorphology (1.2.2).

3. the electric power line ice-covering thickness evaluation method of a kind of optimization according to claim 1, it is characterized in that described icing historical record (2) comprises the wire tension data (2.3) of icing time of origin date (2.1), local environment (1), wire icing thickness (2.2), correspondence.

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