CN106091945A - The distributed sag on-line monitoring system of OPGW and method - Google Patents

Abstract

The distributed sag on-line monitoring system of the OPGW designed by the present invention, including distributed fiber optic temperature and strain (FBG) demodulator, distributed fiberoptic sensor and computer system and information process unit, distributed fiber optic temperature is arranged in transformer station's machine room with information process unit with strain (FBG) demodulator and computer system, distributed fiberoptic sensor is a sensor fibre in OPGW, the communication ends of distributed fiberoptic sensor accesses the sensor communication ends of distributed fiber optic temperature and strain (FBG) demodulator by the interface in transformer station's machine room, distributed fiber optic temperature is connected the signal input part of computer system and information process unit with the signal output part of strain (FBG) demodulator.The present invention is without installing sensor on OPGW, but using optical power grounded waveguide as sensor, by strain and the temperature of detection transmission line of electricity, and according to the sag distributed model of OPGW, it is achieved the sag detection completely of transmission line of electricity optical power grounded waveguide.

Description

The distributed sag on-line monitoring system of OPGW and method

Technical field

The present invention relates to electric power O&M technical field, in particular to a kind of OPGW (Optical Fiber Composite Overhead Ground Wire, i.e. OPGW) distributed sag on-line monitoring system and method.

Technical background

Sag is measured and is played critically important effect for the safe operation controlling circuit, and especially new stringing road is through one section After the operation time, it is sagging that lead wire and earth wire all has in various degree, for safety, with regard to necessary, sag is observed record, Reliable data are provided for electric power netting safe running；Requirement as against regulation in the sag of circuit, excessive or too small all may be because of line Road stress exceedes permissible value and causes the complex grounding fault with interruption, and the tower structure or the wind cycloid that even destroy erection wire cause short Road, produces electric arc, the accident of tripping operation.Therefore, wire has also become extremely important in line construction, line walking with the sag inspection of ground wire A part.

But present stage, the sag of lead wire and earth wire is measured and is substantially rule of thumb used naked eyes to judge by track walker, only spy Just can be observed time different；Although also there being some sag on-line monitoring methods, but it is required on each span of circuit Installing sensor, each sensor can only monitor the sag of a span, and construct complexity, sensor of these modes is affected by environment It is easily damaged.

Summary of the invention

Present invention aim to provide the distributed sag on-line monitoring system of a kind of OPGW and Method, this monitoring system and method is without installing sensor on OPGW, but using optical power grounded waveguide as sensor, passes through The strain of detection transmission line of electricity and temperature, and according to the sag distributed model of OPGW, it is achieved transmission line of electricity optical power grounded waveguide is complete The sag detection of line.

For realizing this purpose, the distributed sag on-line monitoring system of the OPGW designed by the present invention, It is characterized in that: it includes distributed fiber optic temperature and strain (FBG) demodulator, distributed fiberoptic sensor and computer system and letter Breath processing unit, it is characterised in that: distributed fiber optic temperature sets with information process unit with strain (FBG) demodulator and computer system Putting in transformer station's machine room, described distributed fiberoptic sensor is a sensor fibre in OPGW, distribution The communication ends of formula Fibre Optical Sensor accesses the biography of distributed fiber optic temperature and strain (FBG) demodulator by the interface in transformer station's machine room Sensor communication ends, distributed fiber optic temperature is connected computer system and information process unit with the signal output part of strain (FBG) demodulator Signal input part.

The distributed sag on-line monitoring method of a kind of OPGW utilizing said system, it includes as follows Step:

Step 1: utilize distributed fiber optic temperature and strain (FBG) demodulator 1 to measure current average of OPGW Temperature t₂With stress σ₂；

Step 2: distributed fiber optic temperature and strain (FBG) demodulator 1 are according to current mean temperature t of OPGW₂ With stress σ₂, and initial average temperature t when transmission line of electricity is installed₁, primary stress σ₁Parameter γ is carried with initially ratio₁, according to such as Lower formula (1) calculates the ratio under transmission line of electricity conditions present and carries γ₂；

${\mathrm{\σ}}_2-\frac{{\mathrm{E\γ}}_2^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_2^2}={\mathrm{\σ}}_1-\frac{{\mathrm{E\γ}}_1^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_1^2}-\mathrm{\α}Ecos\mathrm{\β}(t_2-t_1)---\left(1\right)$

In formula 1, α is the temperature expansion coefficient of OPGW, and E is the elastic system of OPGW Number, l is the span of OPGW, t₁Initial average temperature when installing for circuit, t₂For OPGW Current mean temperature, β is the representative height difference angle of strain section section to be measured；

Step 3: calculate the maximum sag of OPGW；

When adjacent two OPGW shaft towers are without the discrepancy in elevation, the meter of the maximum sag of OPGW Calculation mode is:

$f_m=\frac{{\mathrm{\γ}}_2{l}^2}{8\mathrm{\σ}}---\left(2\right)$

In formula (2), f_mFor adjacent two OPGW shaft towers without OPGW during the discrepancy in elevation Maximum sag, γ₂Carrying for the ratio under transmission line of electricity conditions present, l is the span of OPGW, and σ is Optical Fiber Composite The stress of aerial earth wire minimum point；

When having the discrepancy in elevation between adjacent two OPGW shaft towers, the maximum sag of OPGW Computing formula be:

${f^{\′}}_m=\frac{f_m}{cos\mathrm{\β}1}---\left(3\right)$

In formula (3), β₁For adjacent two OPGW pole tower ground wire hanging point lines and horizontal angle, f_m For adjacent two OPGW shaft towers without the maximum sag of OPGW, f ' during the discrepancy in elevation_mFor adjacent two The maximum sag of OPGW when having the discrepancy in elevation between individual OPGW shaft tower；

Step 4: computer system and information process unit 3 utilize the mode of step 1～3, and it is different to combine transmission line of electricity The discrepancy in elevation situation of point, calculates the distributed sag of each point on OPGW, is finally completed fine composite overhead ground wire Distributed sag on-line monitoring.

Distributed fiber optic temperature launches arteries and veins in a strain (FBG) demodulator single-mode fiber in OPGW Impulse optical signal, when optical signal is propagated in a fiber, is affected by fiber optic materials and can be produced back scattering optical signal.When OPGW's After temperature, strain change, the sag of OPGW will change；The micro structure of optical fiber also can change simultaneously, causes The centre wavelength of rear orientation light can offset；(FBG) demodulator just can be calculated by the time of return of detection rear orientation light The position that temperature, strain change, and demodulate temperature and the strain size of each position along the line.Distributed fiber optic temperature with should Become (FBG) demodulator the temperature of acquisition to be transferred at computer system and information by USB interface with strain data and positional information thereof Reason unit, carries out the sag computing of OPGW, and complete data storage, manage, calculate, result shows, abnormal alarm etc., reach Monitor the purpose of OPGW sag condition in real time.

The present invention uses a single-mode fiber in OPGW as sensor, solves existing sag prison Examining system needs the problem that the big quantity sensor of in-site installation even needs on-the-spot power supply；The sag that can monitor each span completely divides Cloth, system reliability is strong；Using on-line monitoring technique, real-time is good, efficiency is high；Detection device Host is placed in transformer station, is subject to Environmental effect is little；On-the-spot without extra sensor, easy care.This technical intelligence degree is high, it is simple to computer programming diagnoses, energy Enough it is significantly reduced manpower, financial resources, time cost, there is important economic worth and social value.

Distributed sag on-line monitoring method of the present invention, can be according to acquisition from each data system of electrical network Line tower foundation information (initial installation curve, line parameter circuit value etc.), and join with strain according to the temperature of electric transmission line of this method acquisition Number, based on sag computing formula, it is achieved the distributed sag on-line monitoring of transmission line of electricity.When sag exceedes properly functioning threshold value Time, alarm staff carries out circuit rectification.

Accompanying drawing explanation

Fig. 1 is the method step flow chart of the present invention；

Fig. 2 is the system structure schematic diagram of the present invention.

In figure, 1 distributed fiber optic temperature and strain (FBG) demodulator, 2 distributed fiberoptic sensors, 3 computer systems With information process unit.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:

The distributed sag on-line monitoring system of OPGW as described in Figure 2, it is characterised in that: it includes Distributed fiber optic temperature and strain (FBG) demodulator 1, distributed fiberoptic sensor 2 and computer system and information process unit 3, it is special Levy and be: distributed fiber optic temperature is arranged on transformer station's machine room with strain (FBG) demodulator 1 and computer system with information process unit 3 In, described distributed fiberoptic sensor 2 is a sensor fibre in OPGW, distributed fiberoptic sensor 2 Communication ends accessed the sensor communication ends of distributed fiber optic temperature and strain (FBG) demodulator 1 by the interface in transformer station's machine room, It is defeated with the signal of information process unit 3 that distributed fiber optic temperature is connected computer system with the signal output part of strain (FBG) demodulator 1 Enter end.

In technique scheme, described distributed fiberoptic sensor 2 is single-mode fiber.

In technique scheme, the signal input part of described computer system and information process unit 3 by USB interface with Distributed fiber optic temperature is connected with the signal output part of strain (FBG) demodulator 1, and computer system receives distribution with information process unit 3 Formula fiber optic temperature and the temperature and the strain information that strain each locus on the distributed fiberoptic sensor 2 that (FBG) demodulator 1 sends, and Calculate the sag of transmission line of electricity.Described computer system and information process unit 3 are by USB interface and distributed fiber optic temperature It is connected with strain (FBG) demodulator 1, receives distributed fiber optic temperature and each sky on the distributed fiberoptic sensor of strain (FBG) demodulator 1 transmission Between temperature on position and strain information；And complete to store, manage, calculate, display information, calculated by existing respective algorithms The sag of OPGW, reaches to monitor in real time the purpose of OPGW sag condition.

In technique scheme, described distributed fiber optic temperature is launched to OPGW with strain (FBG) demodulator 1 Pulsed laser signal, when optical signal is propagated in a fiber, is affected by fiber optic materials and can be produced back scattering optical signal；Work as optical fiber After the temperature of composite overhead ground wire, strain change, the sag of OPGW will change；Optical fiber simultaneously Micro structure also can change, cause the centre wavelength of rear orientation light to offset；Distributed fiber optic temperature and strain (FBG) demodulator 1 calculates the temperature of OPGW by the time of return of detection rear orientation light and strain changes Position.

A kind of distributed sag on-line monitoring method of the OPGW utilizing said system, as it is shown in figure 1, It comprises the steps:

Step 1: utilize distributed fiber optic temperature and strain (FBG) demodulator 1 to measure current average of OPGW Temperature t₂With stress σ₂；

Step 2: distributed fiber optic temperature and strain (FBG) demodulator 1 are according to current mean temperature t of OPGW₂ With stress σ₂, and initial average temperature t when transmission line of electricity is installed₁, primary stress σ₁Parameter γ is carried with initially ratio₁, according to such as Lower formula (1) calculates the ratio under transmission line of electricity conditions present and carries γ₂；

${\mathrm{\σ}}_2-\frac{{\mathrm{E\γ}}_2^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_2^2}={\mathrm{\σ}}_1-\frac{{\mathrm{E\γ}}_1^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_1^2}-\mathrm{\α}Ecos\mathrm{\β}(t_2-t_1)---\left(1\right)$

In formula 1, α is the temperature expansion coefficient of OPGW, and E is the elastic system of OPGW Number, l is the span of OPGW, t₁Initial average temperature when installing for circuit, t₂For OPGW Current mean temperature, β is the representative height difference angle of strain section section to be measured；

Step 3: calculate the maximum sag of OPGW；

When adjacent two OPGW shaft towers are without the discrepancy in elevation, the meter of the maximum sag of OPGW Calculation mode is:

$f_m=\frac{{\mathrm{\γ}}_2{l}^2}{8\mathrm{\σ}}---\left(2\right)$

In formula (2), f_mFor adjacent two OPGW shaft towers without OPGW during the discrepancy in elevation Maximum sag, γ₂Carrying for the ratio under transmission line of electricity conditions present, l is the span of OPGW, and σ is Optical Fiber Composite The stress of aerial earth wire minimum point；

When having the discrepancy in elevation between adjacent two OPGW shaft towers, the maximum sag of OPGW Computing formula be:

${f^{\′}}_m=\frac{f_m}{cos\mathrm{\β}1}---\left(3\right)$

In formula (3), β₁For adjacent two OPGW pole tower ground wire hanging point lines and horizontal angle, f_m For adjacent two OPGW shaft towers without the maximum sag of OPGW, f ' during the discrepancy in elevation_mFor adjacent two The maximum sag of OPGW when having the discrepancy in elevation between individual OPGW shaft tower；

Step 4: computer system and information process unit 3 utilize the mode of step 1～3, and it is different to combine transmission line of electricity The discrepancy in elevation situation of point, calculates the distributed sag of each point on OPGW, is finally completed fine composite overhead ground wire Distributed sag on-line monitoring；

Step 5: by optical fiber time properly functioning to the distributed sag of each point on OPGW and transmission line of electricity On composite overhead ground wire, the distributed sag threshold value of each point compares, when the distributed sag of each point on fine composite overhead ground wire Exceed transmission line of electricity properly functioning time OPGW on each point distributed sag threshold value computer-chronograph system with Information process unit 3 is reported to the police.

This method with effective acquisition OPGW along the sag distribution characteristics of circuit, and can realize on-line monitoring；Pacify without scene Dress sensor, is greatly improved the efficiency that sag is measured.

In technique scheme, sag refers to that any point on circuit is to the vertical distance between hitch point line；Maximum arc Hang down refer to aerial line under calm meteorological condition, the maximum of span central authorities sag in vertical plane.Generally described in power department Sag refers to maximum sag.In power system, the state equation of circuit describes circuit stress along with meteorological condition change Rule, after the ratio load of known a certain state, temperature, stress, (will there is a peace when initial installation in any circuit Dress curve, is equivalent to have recorded out initial ratio load, temperature and stress), it is possible to use state equation calculates under other states Stress, and then calculate the parameters such as sag.

The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.

Claims (6)

1. the distributed sag on-line monitoring system of an OPGW, it is characterised in that: it includes distributed light Fine temperature and strain (FBG) demodulator (1), distributed fiberoptic sensor (2) and computer system and information process unit (3), its feature It is: distributed fiber optic temperature is arranged on transformer station's machine with strain (FBG) demodulator (1) and computer system with information process unit (3) In room, described distributed fiberoptic sensor (2) is a sensor fibre in OPGW, distributing optical fiber sensing The communication ends of device (2) accesses the sensor of distributed fiber optic temperature and strain (FBG) demodulator (1) by the interface in transformer station's machine room Communication ends, distributed fiber optic temperature is connected computer system and information process unit with the signal output part of strain (FBG) demodulator (1) (3) signal input part.

The distributed sag on-line monitoring system of OPGW the most according to claim 1, it is characterised in that: Described distributed fiberoptic sensor (2) is single-mode fiber.

The distributed sag on-line monitoring system of OPGW the most according to claim 1, it is characterised in that: The signal input part of described computer system and information process unit (3) is by USB interface and distributed fiber optic temperature and strain The signal output part of (FBG) demodulator (1) connects, and computer system receives distributed fiber optic temperature and strain with information process unit (3) The temperature of the upper each locus of the distributed fiberoptic sensor (2) that (FBG) demodulator (1) sends and strain information, and calculate power transmission line The sag on road.

The distributed sag on-line monitoring system of OPGW the most according to claim 1, it is characterised in that: Described distributed fiber optic temperature and strain (FBG) demodulator (1) are to OPGW emission pulse laser signal, and optical signal exists When optical fiber is propagated, affected by fiber optic materials and can be produced back scattering optical signal；When OPGW temperature, should Becoming after changing, the sag of OPGW will change；The micro structure of optical fiber also can change simultaneously, The centre wavelength causing rear orientation light can offset；Distributed fiber optic temperature and strain (FBG) demodulator (1) are backward by detection The time of return of scattered light calculates the temperature of OPGW and strains the position changed.

5. utilize a distributed sag on-line monitoring method for the OPGW of system described in claim 1, its It is characterised by: it comprises the steps:

Step 1: utilize distributed fiber optic temperature and strain (FBG) demodulator (1) to measure the average temperature that OPGW is current Degree t₂With stress σ₂；

Step 2: mean temperature t that distributed fiber optic temperature is current with strain (FBG) demodulator (1) foundation OPGW₂With Stress σ₂, and initial average temperature t when transmission line of electricity is installed₁, primary stress σ₁Parameter γ is carried with initially ratio₁, according to as follows Formula (1) calculates the ratio under transmission line of electricity conditions present and carries γ₂；

${\mathrm{\σ}}_2-\frac{{\mathrm{E\γ}}_2^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_2^2}={\mathrm{\σ}}_1-\frac{{\mathrm{E\γ}}_1^{2}l{\cos }^3\mathrm{\β}}{24{\mathrm{\σ}}_1^2}-\mathrm{\α}Ecos\mathrm{\β}(t_2-t_1)---\left(1\right)$

In formula 1, α is the temperature expansion coefficient of OPGW, and E is the coefficient of elasticity of OPGW, l For the span of OPGW, t₁Initial average temperature when installing for circuit, t₂Current for OPGW Mean temperature, β is the representative height difference angle of strain section section to be measured；

Step 3: calculate the maximum sag of OPGW；

When adjacent two OPGW shaft towers are without the discrepancy in elevation, the calculating side of the maximum sag of OPGW Formula is:

$f_m=\frac{{\mathrm{\γ}}_2{l}^2}{8\mathrm{\σ}}---\left(2\right)$

In formula (2), f_mFor adjacent two OPGW shaft towers without the maximum arc of OPGW during the discrepancy in elevation Hang down, γ₂Carrying for the ratio under transmission line of electricity conditions present, l is the span of OPGW, and σ is optical fiber composite overhead ground The stress of line minimum point；

When having the discrepancy in elevation between adjacent two OPGW shaft towers, the meter of the maximum sag of OPGW Calculation formula is:

${f^{\′}}_m=\frac{f_m}{cos\mathrm{\β}1}---\left(3\right)$

In formula (3), β 1 is adjacent two OPGW pole tower ground wire hanging point lines and horizontal angle, f_mFor phase Adjacent two OPGW shaft towers are without the maximum sag of OPGW, f ' during the discrepancy in elevation_mFor adjacent two light The maximum sag of OPGW when having the discrepancy in elevation between fine composite overhead ground wire shaft tower；

Step 4: computer system and information process unit (3) utilize the mode of step 1～3, and combine transmission line of electricity difference Discrepancy in elevation situation, calculate the distributed sag of each point on OPGW, be finally completed fine composite overhead ground wire Distributed sag on-line monitoring.

The distributed sag on-line monitoring method of OPGW the most according to claim 5, it is characterised in that: Step 5 is also included: by properly functioning with transmission line of electricity for the distributed sag of each point on OPGW after described step 4 Time OPGW on the distributed sag threshold value of each point compare, when on fine composite overhead ground wire each point point Cloth sag exceed transmission line of electricity properly functioning time OPGW on the distributed sag threshold value of each point time calculate Machine system is reported to the police with information process unit (3).