CN104457594B - The distributed icing monitoring method of a kind of transmission line of electricity - Google Patents

The distributed icing monitoring method of a kind of transmission line of electricity Download PDF

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CN104457594B
CN104457594B CN201410727795.6A CN201410727795A CN104457594B CN 104457594 B CN104457594 B CN 104457594B CN 201410727795 A CN201410727795 A CN 201410727795A CN 104457594 B CN104457594 B CN 104457594B
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icing
pole line
line
electricity
linear mass
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CN104457594A (en
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邱平
王磊
覃兆宇
沈龙
徐云水
李锐
付玉峰
贾永
王龙华
钱进
段守胜
史会轩
***
乐文静
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Wuhan NARI Ltd
Zhaotong Power Supply Bureau of Yunnan Power Grid Co Ltd
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Wuhan NARI Ltd
Zhaotong Power Supply Bureau of Yunnan Power Grid Co Ltd
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Abstract

The invention discloses the distributed icing monitoring method of a kind of transmission line of electricity, step is as follows: step one, phase place optical time domain reflectometer monitor the natural vibration frequency of transmission line of electricity pole line when non-icing and icing; Step 2, calculate and data processing unit according to the natural vibration frequency of pole line during non-icing, the non-icing horizontal stress of calculating support ceases to be busy; Step 3, to calculate and data processing unit obtains linear mass and the relation of horizontal stress and the relation of linear mass and ice covering thickness in pole line icing situation respectively; Step 4, in conjunction with the relation of transmission line of electricity material parameter, geography information parameter, linear mass and ice covering thickness and Equation of Overhead Wire, with pole line ice covering thickness for unknown quantity, calculate the equivalent ice covering thickness adopting Newton iteration method to calculate to obtain pole line with data processing unit.The present invention have monitoring method intelligence degree high, be convenient to analyze the feature of icing degree of judging, can be widely used on transmission line of electricity.

Description

The distributed icing monitoring method of a kind of transmission line of electricity
Technical field
The present invention relates to transmission line of electricity, particularly relate to the distributed icing monitoring method of a kind of transmission line of electricity.
Background technology
In icing monitoring in early days, generally adopt the method setting up sight ice station study and observe the icing situation of transmission line of electricity both at home and abroad, this method investment is large, construction period is long, and operating cost is high, limited amount, cannot realize the Real-Time Monitoring of whole electrical network icing situation.In recent years, powerline ice-covering and microclimate on-line monitoring technique obtain and develop rapidly, and become perception electrical network ice coating state and prevention large area icing, the Main Means avenging disaster accident gradually.The icing monitoring method that grows up at present mainly contains: weight method, wire tilt-angle method, image monitoring method, icing ratemeter method, analog conducting wire method and quasi-distributed optical fiber sensing method etc.Wherein, weight method, the application at home of wire tilt-angle method are comparatively extensive.But these monitoring methods are all point type monitoring methods, only carry out ice coating state monitoring for some specific circuit on transmission line of electricity, the distributed Real-Time Monitoring of circuit truly can not be realized.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, there is provided a kind of transmission line of electricity distributed icing monitoring method, have monitoring method intelligence degree high, be convenient to computing machine and carry out automatic analysis and judgment icing degree, have important economic worth and the feature of social value.
The distributed icing monitoring method of a kind of transmission line of electricity provided by the invention, comprise the steps: step one, adopt phase place optical time domain reflectometer (phi-OTDR, phase-OpiticalTimeDomainReflectmeter) monitoring to obtain the natural vibration frequency f of transmission line of electricity pole line under non-icing and icing situation respectively 01and f 02; Step 2, calculating and data processing unit are according to the natural vibration frequency f of pole line in non-icing situation 01, the horizontal stress σ in the non-icing situation of calculating support ceases to be busy 01; Step 3, to calculate and data processing unit obtains linear mass and the relation of horizontal stress and the relation of linear mass and ice covering thickness in pole line icing situation respectively, in pole line icing situation, the relation formula of linear mass and horizontal stress is: wherein, after icing, the horizontal stress of pole line is σ 02, linear mass is m 02, l is the span of pole line, f 02for the natural vibration frequency of pole line in icing situation, A is that the computing nodes of pole line amasss; In pole line icing situation, the relation formula of linear mass and ice covering thickness is: m 02=m 0+ 0.9 π b (d+b) × 10 -3, wherein, d is the diameter of pole line, and b is ice covering thickness, m 0for the linear mass of pole line in non-icing situation; Step 4, in conjunction with the relation of transmission line of electricity material parameter, geography information parameter, linear mass and ice covering thickness and Equation of Overhead Wire, with transmission line of electricity pole line ice covering thickness for unknown quantity, calculate the equivalent ice covering thickness adopting Newton iteration method to calculate to obtain pole line with data processing unit, realize the distributed icing monitoring of transmission line of electricity, described Equation of Overhead Wire is as follows: σ 02 - E γ ′ 2 l 2 cos 3 β 24 σ 02 2 = σ 01 - E γ 2 l 2 cos 3 β 24 σ 01 2 - α E cos β ( t 2 - t 1 ) , σ in formula 01and σ 02horizontal stress corresponding under being respectively the non-icing of pole line and icing situation, E is the Young modulus of cable, and β is the height difference angle of span, and α is the thermal expansivity of cable, and l is the span of pole line, t 1and t 2be respectively the temperature of cable in non-icing and icing situation, during icing, think t 1≈ t 2, the comprehensive ratio that γ ' and γ is respectively in icing and non-icing situation carries, and described γ ' and γ and pole line linear mass close and be: m in formula 0linear mass during icing non-for pole line, m 02for the linear mass after pole line icing, g is acceleration of gravity.
In technique scheme, in described step 2, the natural vibration frequency that pole line is monitored by phase place optical time domain reflectometer in non-icing situation is: wherein, l is the span of pole line, T 01for the Horizontal Tension in non-icing situation, m 0for the linear mass in non-icing situation, the Horizontal Tension T of pole line in non-icing situation can be obtained by this formula 01; Again by formula σ 01=T 01/ A obtains the horizontal stress σ in the non-icing situation of transmission line of electricity 01, wherein, A is that the computing nodes of pole line amasss.
The distributed icing monitoring method of transmission line of electricity of the present invention, there is following beneficial effect: adopt phase place optical time domain reflectometer technology, by the vibration frequency information of monitoring transmission line of electricity each span, the distributed icing monitoring of transmission line of electricity just can be realized in conjunction with the material parameter of transmission line of electricity and geography information.Have monitoring method intelligence degree high, be convenient to computing machine and carry out automatic analysis and judgment icing degree, have important economic worth and the feature of social value.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the distributed icing monitoring method of transmission line of electricity of the present invention;
Fig. 2 is the structural representation relating to hardware in the distributed icing monitoring method of transmission line of electricity of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
See Fig. 1 to Fig. 2, the distributed icing monitoring method of transmission line of electricity of the present invention, comprises the steps:
Step one, the monitoring of employing phase place optical time domain reflectometer obtain the natural vibration frequency f of transmission line of electricity pole line under non-icing and icing situation respectively 01and f 02;
Step 2, calculating and data processing unit are according to the natural vibration frequency f of pole line in non-icing situation 01, the horizontal stress σ in the non-icing situation of calculating support ceases to be busy 01;
Step 3, to calculate and data processing unit obtains linear mass and the relation of horizontal stress and the relation of linear mass and ice covering thickness in pole line icing situation respectively;
Step 4, in conjunction with the relation of transmission line of electricity material parameter, geography information parameter, linear mass and ice covering thickness and Equation of Overhead Wire, with transmission line of electricity pole line ice covering thickness for unknown quantity, calculate the equivalent ice covering thickness adopting Newton iteration method to calculate to obtain pole line with data processing unit, the distributed icing realizing transmission line of electricity is monitored.
Along with development and the widespread use of optical fiber sensing technology, people more favor in employing optical fiber sensing technology to realize distributed on line monitoring.Phase place optical time domain reflectometer (phi-OTDR) is a kind of technology detected based on fiber Rayleigh scattering light intensity (RayleighScattering), can detect the vibrational state of transmission line of electricity, the present invention intends the ice covering thickness on-line monitoring being realized transmission line of electricity by phi-OTDR.
The equipment that the distributed icing monitoring method of transmission line of electricity of the present invention relates to comprises: phi-OTDR, distributed fiberoptic sensor and calculating and data processing unit.Described distributed fiberoptic sensor is a sensor fibre in OPGW optical (OpticalfibercompositeGroundWire), the distributed fiberoptic sensor of Optical Fiber composite overhead Ground Wire is connected with data processing unit with calculating by interface access phi-OTDR, the phi-OTDR in transformer station.
The principle of described phi-OTDR for launch super-narrow line width laser signal in distributed fiberoptic sensor, when light signal is propagated in a fiber again, impact by fiber optic materials can produce Rayleigh beacon light intensity signal, when optical fiber is subject to external disturbance, the refractive index of optical fiber can change, thus cause disturbance region light signal generation phase place to change, by interference effect, the change of this phase place can cause the light intensity of backward Rayleigh scattering light to change, just can calculation perturbation point position and vibration frequency by the time of return and light intensity detecting backward Rayleigh scattering light.
Single-mode fiber in described distributed fiberoptic sensor i.e. Optical Fiber composite overhead Ground Wire, utilizes a single-mode fiber in Optical Fiber composite overhead Ground Wire as sensor, the vibration information of monitoring sensor.
Described calculating is connected with phi-OTDR by USB interface respectively with data processing unit, receive the vibration information on each locus of distributed fiberoptic sensor of phi-OTDR transmission, and complete storage, management, calculating and display information, calculate the distributed icing situation of transmission line of electricity by respective algorithms, realize the distributed icing on-line monitoring of transmission line of electricity.
The distributed icing of transmission line of electricity of the present invention monitors concrete principle: ultra-high-tension power transmission line pole line just has its natural vibration frequency at the beginning of stringing, and its natural vibration frequency is relevant with the line density of the Horizontal Tension suffered by pole line and pole line itself:
f = 1 2 l T 0 m ( Hz ) - - - ( 1 )
In formula, l is the span (m) of pole line, T 0for the horizontal pull (N) of pole line, m is the linear mass (kg/m) of pole line.
Suppose that pole line is when non-icing, its Horizontal Tension is T 01(N), corresponding horizontal stress is σ 01(Mp), linear mass is m 0(kg/m); Horizontal Tension after icing is T 02(N), corresponding horizontal stress is σ 02(Mpa), linear mass is m 02(kg/m).
The natural vibration frequency that pole line is monitored by phi-OTDR in non-icing situation is:
f 01 = 1 2 l T 01 m 0 - - - ( 2 )
Due to the linear mass m in non-icing situation 0known, then calculate Horizontal Tension T corresponding to pole line by above formula 01, and then by relational expression σ 01=T 01(A is the long-pending (mm of computing nodes of pole line to/A 2)) obtain the horizontal stress σ of transmission line of electricity 01.
When after pole line icing, the natural vibration frequency monitored by phi-OTDR is:
f 02 = 1 2 l T 02 m 02 - - - ( 3 )
The relation of linear mass and pole line horizontal stress after pole line icing can be obtained by above formula and stress-strain relation:
m 02 = σ 02 A 4 l 2 f 02 2 - - - ( 4 )
Pole line linear mass and ice covering thickness have following relation:
m 02＝m 0+0.9πb(d+b)×10 -3(5)
Wherein, d is the diameter (mm) of pole line, and b is ice covering thickness (mm), then by obtaining the relation of ice covering thickness and pole line horizontal stress with co-relation.
In conjunction with material parameter, the geography information parameter of transmission line of electricity, Equation of Overhead Wire is adopted to solve the horizontal stress after obtaining pole line icing:
σ 02 - E γ ′ 2 l 2 cos 3 β 24 σ 02 2 = σ 01 - E γ 2 l 2 cos 3 β 24 σ 01 2 - α E cos β ( t 2 - t 1 ) - - - ( 6 )
σ in formula 01and σ 02be respectively horizontal stress corresponding in the non-icing of pole line and icing situation, E is the Young modulus (Mpa) of cable, and β is the height difference angle (rad) of span, and α is the thermal expansivity (/ DEG C) of cable, t 1and t 2(DEG C) is respectively the temperature of cable in non-icing and icing situation, and during icing, the impact of temperature is little, thinks t 1≈ t 2, the comprehensive ratio that γ ' (Mpa/m) and γ (Mpa/m) is respectively in icing and non-icing situation carries, and described γ ' and γ and pole line linear mass have following relation:
γ ′ = m 02 g A , γ = m 0 g A - - - ( 7 )
In formula, g is acceleration of gravity.
Therefore, by the horizontal stress σ in non-for pole line icing situation 01be brought in state equation (6) formula with formula (7), (4), (5), with ice covering thickness b for known variables, adopt Newton iteration method can calculate the ice covering thickness value obtaining pole line, realize the distributed icing monitoring of transmission line of electricity pole line.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.

Claims (2)

1. the distributed icing monitoring method of transmission line of electricity, is characterized in that: comprise the steps:
Step one, the monitoring of employing phase place optical time domain reflectometer obtain the natural vibration frequency f of transmission line of electricity pole line under non-icing and icing situation respectively 01and f 02;
Step 2, calculating and data processing unit are according to the natural vibration frequency f of pole line in non-icing situation 01, the horizontal stress σ in the non-icing situation of calculating support ceases to be busy 01;
Step 3, to calculate and data processing unit obtains linear mass and the relation of horizontal stress and the relation of linear mass and ice covering thickness in pole line icing situation respectively, in pole line icing situation, the relation formula of linear mass and horizontal stress is:
m 02 = σ 02 A 4 l 2 f 02 2 ,
Wherein, after icing, the horizontal stress of pole line is σ 02, linear mass is m 02, l is the span of pole line, f 02for the natural vibration frequency of pole line in icing situation, A is that the computing nodes of pole line amasss;
In pole line icing situation, the relation formula of linear mass and ice covering thickness is:
m 02＝m 0+0.9πb(d+b)×10 -3，
Wherein, d is the diameter of pole line, and b is ice covering thickness, m 0for the linear mass of pole line in non-icing situation;
Step 4, in conjunction with the relation of transmission line of electricity material parameter, geography information parameter, linear mass and ice covering thickness and Equation of Overhead Wire, with transmission line of electricity pole line ice covering thickness for unknown quantity, calculate the equivalent ice covering thickness adopting Newton iteration method to calculate to obtain pole line with data processing unit, realize the distributed icing monitoring of transmission line of electricity, described Equation of Overhead Wire is as follows:
σ 02 - Eγ ′ l 2 cos 3 β 24 σ 02 2 = σ 01 - Eγ 2 l 2 cos 3 β 24 σ 01 2 - α E c o s β ( t 2 - t 1 ) ,
σ in formula 01and σ 02horizontal stress corresponding under being respectively the non-icing of pole line and icing situation, E is the Young modulus of pole line, and β is the height difference angle of span, and α is the thermal expansivity of pole line, and l is the span of pole line, t 1and t 2be respectively the temperature of pole line in non-icing and icing situation, during icing, think t 1≈ t 2, the comprehensive ratio that γ ' and γ is respectively in icing and non-icing situation carries, and described γ ' and γ and pole line linear mass close and be: m in formula 0linear mass during icing non-for pole line, m 02for the linear mass after pole line icing, g is acceleration of gravity.
2. the distributed icing monitoring method of transmission line of electricity according to claim 1, is characterized in that: in described step 2, and the natural vibration frequency that pole line is monitored by phase place optical time domain reflectometer in non-icing situation is:
f 01 = 1 2 l T 01 m 0 ,
Wherein, l is the span of pole line, T 01for the Horizontal Tension in non-icing situation, m 0for the linear mass in non-icing situation, the Horizontal Tension T of pole line in non-icing situation can be obtained by this formula 01;
Again by formula σ 01=T 01/ A obtains the horizontal stress σ in the non-icing situation of pole line 01, wherein, A is that the computing nodes of pole line amasss.
CN201410727795.6A 2014-12-04 2014-12-04 The distributed icing monitoring method of a kind of transmission line of electricity Active CN104457594B (en)

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CN110006525A (en) * 2019-01-24 2019-07-12 广东省特种设备检测研究院珠海检测院 A kind of defeated aerial pipeline distribution stress system of condition monitoring of length and method
CN110686608B (en) * 2019-11-11 2021-08-31 国网湖南省电力有限公司 Portable icing thickness measuring device for power transmission line and measuring method thereof
CN110986881A (en) * 2019-12-17 2020-04-10 国网江苏省电力有限公司检修分公司 Power transmission line icing on-line monitoring system based on meteorological temperature
CN111371492B (en) * 2020-03-11 2023-05-26 云南电网有限责任公司昭通供电局 Optical fiber transmission quality monitoring device in optical fiber composite overhead ground wire deicing through flow

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