CN212782059U - Evaluation system based on transmission line life - Google Patents
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Abstract
The utility model provides an evaluation system based on transmission line life-span finds eigenvalue, variance contribution rate and the cumulative contribution rate of each principal component through principal component analysis, establishes ageing evaluation model, calculates the actual ageing degree value of OPGW optical cable. The utility model discloses an ageing aassessment model of OPGW optical cable has realized each key parameter real-time supervision of OPGW optical cable.
Description
Technical Field
The utility model relates to a fiber grating application technology field particularly, relates to an evaluation system based on transmission line life-span.
Background
With the increasing environmental pressure of global resources, the deepening of the electric power marketization process and the increasing of the reliability and quality requirements of users on electric energy, the construction of a safer, more reliable, more environment-friendly and more economic electric power system becomes a common target of the global electric power industry. According to the international and domestic development trends, national power grid companies (hereinafter referred to as companies) put forward strong smart power grids which are developed in a coordinated manner at all levels by taking uniform planning, uniform standards and uniform construction as principles, taking ultra-high voltage power grids as backbone network frames and have informatization, automation and interaction characteristics.
Since the 'twelve five' time, with the comprehensive development of strong intelligent power grid construction, the informationization, management intellectualization and decision-making scientific construction of companies are comprehensively promoted. The power grid production scheduling service, the company information management service and the communication intellectualization level present new characteristics. The implementation of corporate strategy development places higher demands on the security, reliability and economy of communication networks. The OPGW optical cable is used as an important component of a power communication network and plays an irreplaceable supporting role in effective operation of a smart grid, so that higher requirements are put forward on the reliability and the economy of the OPGW optical cable.
China has built a special optical fiber communication network for electric power with the largest scale all over the world, wherein the length of OPGW optical cables directly supplied by companies at or above the level of straight county exceeds 400000 kilometers, and the usage amount of the OPGW optical cables is in the top of the world. The thirteen-five plan aims to take popularization and pilot power grid intelligent projects as future development directions, the application of the OPGW optical cable is further increased on a large scale, and the dominant role of the OPGW optical cable in the construction of the power communication network is more and more obvious. Because the application environment of the OPGW optical cable in China is severe and complex, and the OPGW optical cable is influenced by multiple thunderstorms, repeated ice regions and the like, the OPGW optical cable has potential safety hazards left over due to lightning stroke, ice coating, overvoltage of an electric power system, external force damage, improper engineering construction and unscientific wiring mode, so that the fault of the OPGW optical cable is easily caused, and the actual service life of the OPGW is greatly reduced.
Therefore, a system for comprehensively and correctly recognizing the aging mechanism of the OPGW optical cable, dynamically monitoring various parameters of the OPGW optical cable and evaluating the service life of the OPGW optical cable in real time is urgently needed, and the system has important practical significance for ensuring safe, high-quality, economic, environment-friendly, safe and effective operation of a power grid.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an evaluation system based on transmission line life-span can solve above-mentioned at least one technical problem who mentions. The specific scheme is as follows:
according to the utility model discloses a specific embodiment, the first aspect, the utility model provides an evaluation system based on transmission line life-span, include:
a comprehensive processing unit, a sensing unit, an OPGW optical cable and a tower,
the comprehensive processing unit is connected with the sensing unit through the OPGW optical cable on the tower, and the comprehensive processing unit comprises: a demodulation unit, an evaluation unit and a monitoring device; the demodulation unit is sequentially connected with the evaluation unit and the monitoring equipment and is used for demodulating parameter values of the main component after the change of the main component causes the change of the first measurement range parameter and the second measurement range parameter;
wherein the main components comprise: temperature, strain, waving, damping; the first measurement range parameter includes: the first measurement parameter and the second measurement range parameter comprise: a second measurement parameter, a third measurement parameter, and a fourth measurement parameter;
the evaluation unit is used for receiving the parameter value of the main component demodulated by the demodulation unit after the value of the main component changes and processing the parameter value;
the sensing unit includes: the sensor comprises a discrete sensing unit and a distributed sensing unit;
the discrete sensing units are positioned on two adjacent towers and are sequentially connected with the distributed sensing units, the demodulation units and the evaluation unit;
the discrete sensing unit is used for sensing the change of a first group of environmental parameters causing the change of the first measurement range parameters and feeding back the change to the demodulation unit in the form of optical signals;
the distributed sensing unit is positioned in the OPGW optical cable and used for sensing the change of a second set of environmental parameters causing the change of a second measurement range parameter and feeding back the change to the demodulation unit in the form of an optical signal, wherein the first set of environmental parameters comprises: the first environmental parameter and the second set of environmental parameters include: the second environmental parameter, the third environmental parameter, the fourth environmental parameter, and the fifth environmental parameter.
Optionally, the evaluating unit is configured to receive the parameter value after the value of the principal component is changed and demodulated by the demodulating unit, and process the parameter value, and includes:
obtaining the weight corresponding to the principal component based on the parameter value after the change of the value of the principal component, and constructing a service life evaluation model of the power transmission line based on the weight corresponding to the principal component and the value of the aging degree corresponding to the principal component;
the service life evaluation model of the power transmission line calculates the corresponding relation between the weight corresponding to the principal component and the value of the aging degree corresponding to the principal component to obtain the actual aging degree value of the OPGW optical cable;
and the evaluation unit sends the actual aging degree value of the OPGW optical cable to the monitoring equipment of the transformer substation.
Optionally, the method includes obtaining a weight corresponding to the principal component based on the parameter value after the change of the value of the principal component, and constructing a transmission line life evaluation model based on the weight corresponding to the principal component and the value of the aging degree corresponding to the principal component, including:
calculating the characteristic value, variance contribution rate and accumulated contribution rate of each principal component by a principal component analysis method;
and establishing a service life evaluation model of the power transmission line according to the characteristic value, the variance contribution rate and the accumulated contribution rate of each main component.
Optionally, the calculating, by the power transmission line life evaluation model, a corresponding relationship between the weight corresponding to the principal component and the value of the aging degree corresponding to the principal component to obtain an actual aging degree value of the OPGW optical cable includes:
taking the variance contribution rate of each main component as the value of the corresponding weight coefficient, and determining the positive sign and the negative sign of each weight coefficient through a factor load matrix and a factor variance maximum orthogonal rotation matrix to obtain the weight coefficient;
and adding the products of the weight coefficient of each main component and the aging degree of the corresponding main component to obtain the actual aging degree value of the OPGW optical cable.
Optionally, the actual aging degree value of the OPGW optical cable satisfies the following calculation relationship:
Z＝W1Z1+W2Z2+W3Z3+W4Z4
wherein the weight coefficients of the changed temperature, the changed strain, the changed waving and the changed attenuation are respectively W1、W2、W3、W4The aging degree values corresponding to the temperature, strain, waving and attenuation are respectively Z1、Z2、Z3、Z4And the actual aging degree value of the OPGW optical cable is Z.
Optionally, after the evaluating unit sends the actual aging degree value of the OPGW optical cable to the monitoring device of the substation, the method further includes:
and the monitoring equipment displays the result of the aging state of the OPGW optical cable.
Optionally, the selecting of the main component includes:
randomly and respectively selecting 3 parameters, 4 parameters and 5 parameters to be respectively marked as a first group, a second group and a third group;
respectively do x's to the first group, the second group and the third group2After inspection, temperature, strain, waving and attenuation are selected as main components.
Optionally, the demodulation unit includes: a fiber grating demodulation unit, a distributed fiber sensing demodulation unit and a Brillouin distributed demodulation unit,
the fiber grating demodulation unit is independent from the distributed fiber sensing demodulation unit and the Brillouin distributed demodulation unit and is used for demodulating the parameter value of the first measurement range after the parameter changes;
the distributed optical fiber sensing demodulation unit is used for demodulating the parameter value after the second measurement parameter changes and the parameter value after the third measurement parameter changes;
and the Brillouin distributed demodulation unit is used for demodulating the parameter value of the fourth measurement parameter after being changed.
Compared with the prior art, the above technical scheme of the embodiment of the utility model, following beneficial effect has at least:
the utility model discloses an optical fiber sensing mode is to OPGW optical cable strain, OPGW optical cable temperature, OPGW optical cable waving, OPGW optical cable decay each item OPGW optical cable ageing key parameter real-time measurement and form the ageing evaluation model of OPGW optical cable, realizes that each item key parameter real-time supervision of the OPGW optical cable of in-network operation; the utility model discloses the trouble that can in time discover to take place on the circuit and the hidden danger of existence, be convenient for take necessary maintenance measure, ensure circuit safety, steady operation.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 shows a schematic diagram of a transmission line lifetime based evaluation system according to an embodiment of the invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe … … in embodiments of the present invention, these … … should not be limited to these terms. These terms are used only to distinguish … …. For example, first … … may also be referred to as second … …, and similarly second … … may also be referred to as first … …, without departing from the scope of embodiments of the invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a pair of evaluation system based on transmission line life, entire system includes: the system comprises a comprehensive processing unit 11, a sensing unit 1, an OPGW optical cable 14 and a tower 12;
wherein, the comprehensive processing unit 11 is connected to the sensing unit 1 through the OPGW optical cable 14 on the tower 12, and the comprehensive processing unit 11 includes: a demodulation unit 10, an evaluation unit 8 and a monitoring device 9;
wherein, the demodulation unit 10 is connected with the evaluation unit 8 and the monitoring device 9 in turn; the whole system also comprises a junction box 13, and the towers are connected through the junction box 13 on the OPGW optical cable; the OPGW is fully spliced into an Optical Fiber Composite Overhead Ground Wire, and is also called an Optical Fiber Composite Overhead Ground Wire.
The light emitted by the demodulation unit 10 is transmitted to the sensing unit 1, and when the sensing unit 1 senses a change in an environmental parameter that causes a change in a parameter of the measuring range, so as to feed back to the demodulation unit 10 in the form of optical signal, the demodulation unit 10 will demodulate the parameter value after the parameter variation of the measurement range, based on the parameter values after the parameter change of the measurement range, the evaluation unit obtains the parameter values after the environmental parameter change causing the parameter change of the corresponding measurement range according to the corresponding relation, four parameters are selected as main components in the environmental parameter, a power transmission line life evaluation model is constructed by the weight corresponding to the obtained value of the changed main components (hereinafter referred to as the weight corresponding to the main components) and the value of the aging degree corresponding to the main components, the power transmission line life evaluation model is used for calculating the actual aging degree value of the OPGW optical cable 14 through the evaluation unit 8, and then the actual aging degree value of the OPGW optical cable 14 is transmitted to the monitoring equipment 9 for display.
Wherein, measuring the range parameter includes: wavelength, light intensity, phase and frequency shift; the environmental parameters include: temperature, attenuation, waving, strain, humidity, etc.; selecting 3 parameters, 4 parameters and 5 parameters from environmental parameters of temperature, strain, waving, attenuation and humidity respectively and marking as a first group, a second group and a third group; respectively do x's to the first group, the second group and the third group2After the test, the most obvious temperature, strain, waving and attenuation effects are selected as main components. Wherein, χ2The detection, namely chi-square detection, is to count the deviation degree between the actual observed value and the theoretical inferred value of the sample, the deviation degree between the actual observed value and the theoretical inferred value determines the size of the chi-square value, and if the chi-square value is larger, the deviation degree between the actual observed value and the theoretical inferred value is larger; conversely, the smaller the deviation between the two(ii) a If the two values are completely equal, the chi-square value is 0, which indicates that the theoretical values completely meet. The attenuation refers to the loss of light in the optical fiber transmission process, the light is transmitted in the optical fiber by using the total reflection principle, but the optical fiber with the excellent performance has a small part refracted out when the light is totally reflected, and the longer the transmission length is, the more the total reflection times are, the more the loss is obvious.
The demodulation unit 10 is configured to demodulate a parameter value after the change of the principal component, and includes: the device comprises a fiber grating demodulation unit 5, a distributed fiber sensing demodulation unit 6 and a Brillouin distributed demodulation unit 7, wherein the fiber grating demodulation unit 5, the distributed fiber sensing demodulation unit 6 and the Brillouin distributed demodulation unit 7 are arranged in parallel and are mutually independent;
the distributed optical fiber sensing demodulation unit 6 includes: the Optical Time Domain Reflectometer comprises an OTDR part and a DAS part, wherein the OTDR is fully spliced into an Optical Time Domain Reflectometer, namely an Optical Time Domain Reflectometer; DAS, fully-spliced Distributed fiber Acoustic Sensing, is a Distributed fiber Acoustic Sensing technology.
The sensing unit 1 includes: discrete sensing units 2 and 3 and a distributed sensing unit 4;
the discrete sensing units 2 and 3 are respectively positioned on two adjacent towers, the distance between every two towers is about 50m, the two towers are connected through an OPGW optical cable splice box, the discrete sensing units 2 and 3 are sequentially connected with the distributed sensing unit 4, the fiber grating demodulation unit 5 and the evaluation unit 8, the discrete sensing units 2 and 3 feed back the sensed temperature change causing the central wavelength change to the fiber grating demodulation unit 5 in an optical signal mode, and the fiber grating demodulation unit 5 demodulates the changed temperature value.
The discrete sensing units 3 of the discrete sensing units 2 are respectively positioned on two adjacent towers, and the tower where the discrete sensing unit 3 is positioned is closer to the comprehensive processing unit than the tower where the discrete sensing unit 2 is positioned.
The above description is only for explaining the position relationship of the two sensing units, and does not make a unique limitation on the position relationship, and the position relationship of the two sensing units and the number of the towers are flexibly determined according to specific situations.
The distributed sensing unit 4 is positioned in the OPGW optical cable and is sequentially connected with the distributed optical fiber sensing demodulation unit 6 and the evaluation unit 8, the distributed sensing unit 4 feeds back the sensed variation of the attenuation degree causing the light intensity variation to the distributed optical fiber sensing demodulation unit 6 in an optical signal mode, and the distributed optical fiber sensing demodulation unit 6 demodulates the varied attenuation value (the unit is decibel/kilometer (dB/km));
the OPGW optical cable comprises a plurality of optical fibers, and the distributed sensing unit 4 is one of the optical fibers in the OPGW optical cable, penetrates through the OPGW optical cable and is connected with the comprehensive processing unit;
wherein, attenuation refers to the loss of light in the transmission process of the optical fiber;
the distributed sensing unit 4 feeds back the sensed change of the waving causing the change of the amplitude and the frequency to the distributed optical fiber sensing demodulation unit 6 in an optical signal mode, and the distributed optical fiber sensing demodulation unit 6 demodulates the changed amplitude value and frequency value;
wherein the amplitude and frequency are representative of the waving.
The distributed sensing unit 4 is sequentially connected with the brillouin distributed demodulation unit 7 and the evaluation unit 8, and feeds back the change of the strain which causes the frequency shift change to the fiber grating demodulation unit 5 in an optical signal mode, and the brillouin distributed demodulation unit 7 demodulates the changed strain value. The variance contribution rates are respectively solved for the demodulated changed temperature value, dancing value (namely amplitude value, frequency value and phase value), attenuation value and strain value, each variance contribution rate is respectively used as the absolute value of the corresponding weight coefficient, and the positive and negative signs of each weight coefficient are determined by the factor load matrix and the factor variance maximum orthogonal rotation matrix, namely the values of the obtained weight coefficients W1, W2, W3 and W4 are respectively 0.1, 0.3, 0.2 and 0.4. W is to be1、W2、W3And W4As input data, an aging evaluation model in the evaluation unit 8 is established, the aging evaluation model multiplies the ratio of each main component in the aging degree of the OPGW optical cable 14 by the corresponding weight coefficient to obtain the aging degree value of the corresponding main component, and the aging degree values of the main components are added to obtain the OPGW optical fiberThe actual age of the cable 14. Ratio Z of the aging degree of each main component in OPGW optical cable 141、Z2、Z3And Z4When the optical fiber composite cable is 10%, 30%, 30% and 20%, the actual aging degree of the OPGW optical cable is Z and satisfies the following relational expression: z ═ W1 Z1+W2 Z2+W3 Z3+W4 Z4。
The utility model discloses, through optical fiber sensing mode to OPGW optical cable strain, OPGW optical cable temperature, OPGW optical cable waving, OPGW optical cable decay each item OPGW optical cable ageing key parameter real-time measurement and form the ageing evaluation model of OPGW optical cable, to realizing each item key parameter real-time supervision of the OPGW optical cable of online operation;
the utility model discloses the trouble that can in time discover to take place on the circuit and the hidden danger of existence, be convenient for take necessary maintenance measure, ensure circuit safety, steady operation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (2)
1. An evaluation system based on transmission line life, comprising: a comprehensive processing unit, a sensing unit, an OPGW optical cable and a tower,
the comprehensive processing unit is connected with the sensing unit through the OPGW optical cable on the tower, and the comprehensive processing unit comprises: a demodulation unit, an evaluation unit and a monitoring device; the demodulation unit is sequentially connected with the evaluation unit and the monitoring equipment and is used for demodulating parameter values of the main component after the change of the main component causes the change of the first measurement range parameter and the second measurement range parameter; wherein the main components comprise: temperature, strain, waving, damping; the first measurement range parameter includes: the first measurement parameter and the second measurement range parameter comprise: a second measurement parameter, a third measurement parameter, and a fourth measurement parameter; the evaluation unit is used for receiving the parameter value of the main component demodulated by the demodulation unit after the value of the main component changes and processing the parameter value;
the sensing unit includes: the sensor comprises a discrete sensing unit and a distributed sensing unit; the discrete sensing units are positioned on the second two adjacent towers and are sequentially connected with the distributed sensing units, the demodulation units and the evaluation unit;
the discrete sensing unit is used for sensing the change of a first group of environmental parameters causing the change of the first measurement range parameters and feeding back the change to the demodulation unit in the form of optical signals; the distributed sensing unit is positioned in the OPGW optical cable and used for sensing the change of a second set of environmental parameters causing the change of a second measurement range parameter and feeding back the change to the demodulation unit in the form of an optical signal, wherein the first set of environmental parameters comprises: the first environmental parameter and the second set of environmental parameters include: the second environmental parameter, the third environmental parameter, the fourth environmental parameter, and the fifth environmental parameter.
2. The system of claim 1, wherein the demodulation unit comprises: a fiber grating demodulation unit, a distributed fiber sensing demodulation unit and a Brillouin distributed demodulation unit,
the fiber grating demodulation unit is independent from the distributed fiber sensing demodulation unit and the Brillouin distributed demodulation unit and is used for demodulating the parameter value of the first measurement range after the parameter changes;
the distributed optical fiber sensing demodulation unit is used for demodulating the parameter value after the second measurement parameter changes and the parameter value after the third measurement parameter changes;
and the Brillouin distributed demodulation unit is used for demodulating the parameter value of the fourth measurement parameter after being changed.
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| CN111967730A (en) * | 2020-07-28 | 2020-11-20 | 国网江西省电力有限公司信息通信分公司 | Evaluation system based on transmission line life |
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| CN111967730A (en) * | 2020-07-28 | 2020-11-20 | 国网江西省电力有限公司信息通信分公司 | Evaluation system based on transmission line life |
| CN111967730B (en) * | 2020-07-28 | 2024-05-28 | 国网江西省电力有限公司信息通信分公司 | Evaluation system based on service life of power transmission line |
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