CN111693216A - Cable water inflow detection method based on thermal parameter time change of filling layer material - Google Patents
Cable water inflow detection method based on thermal parameter time change of filling layer material Download PDFInfo
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- CN111693216A CN111693216A CN202010668092.6A CN202010668092A CN111693216A CN 111693216 A CN111693216 A CN 111693216A CN 202010668092 A CN202010668092 A CN 202010668092A CN 111693216 A CN111693216 A CN 111693216A
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Abstract
The invention discloses a cable water inlet detection method based on the thermal parameter time change of a filling layer material, which comprises the following steps: s1, placing a temperature sensor in the filling layer of the cable; s2, calibrating a plurality of temperature detection points along the axial direction of the cable, wherein the distance between every two adjacent temperature detection points is D; the distance in this embodiment is 20cm, and is a proper distance to ensure the accuracy of the detection result. S3, recording the temperature value of each temperature detection point after the cable runs stably; and S4, comparing each temperature value with the standard temperature of the standard database, and judging whether the cable position where the temperature value is relative is water or not according to the comparison result. The invention can judge whether the cable enters water on line, can accurately determine the water inlet position, improves the reliability and timeliness of monitoring the water inlet of the cable, and has great social and economic benefits for ensuring the operation stability of a power grid and the operation reliability of the cable.
Description
Technical Field
The invention relates to a cable detection technology, in particular to a cable water inlet detection method based on the thermal parameter time change of a filling layer material.
Background
With the popularization of cable line construction and the wide application of power cables, related faults of the cables occur more frequently, wherein the line faults caused by water inflow of the cables are common. In order to prevent the water from diffusing after the cable is filled with water, a filling layer is usually arranged in the power cable. The filling layer is made of materials with water absorption and expansion properties, and the filling layer quickly expands when meeting water and then conducts water to diffuse longitudinally along the cable so as to realize water resistance.
At present, means for effectively detecting water inflow of a cable on line are lacked, and no clear index is provided for representing the water inflow condition of the cable. The cable water inlet detection method is developed, online timely and accurate monitoring is achieved, and great social and economic benefits are achieved for guaranteeing operation stability of a power grid and operation reliability of a cable.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a cable water inlet detection method based on the time change of the thermal parameter of a filling layer material. The cable water inlet detection method based on the thermal parameter time change of the filling layer material can detect whether the cable enters water on line, and can position the water inlet position so as to monitor the cable in real time.
The purpose of the invention is realized by the following technical scheme: the cable water inflow detection method based on the thermal parameter time change of the filling layer material comprises the following steps:
s1, placing a temperature sensor in the filling layer of the cable;
s2, calibrating a plurality of temperature detection points along the axial direction of the cable, wherein the distance between every two adjacent temperature detection points is D;
s3, recording the temperature value of each temperature detection point after the cable runs stably;
and S4, comparing each temperature value with the standard temperature of the standard database, and judging whether the cable position where the temperature value is relative is water or not according to the comparison result.
In step S1, the temperature sensor is a distributed optical fiber temperature sensor, and the distributed optical fiber temperature sensor is distributed spirally or linearly.
The standard temperature of the standard database in step S4 is obtained by collecting the normal cable under the condition of specific parameters including the cable running time, humidity and the load on the cable.
The standard database is established specifically as follows:
selecting a cable with a certain normal length, marking temperature measurement nodes according to a certain distance along the axial direction of the cable, and sequencing the temperature measurement nodes;
after the cable normally runs, under specific parameters, the temperature values measured by each temperature measuring node are stored once every 30-90 s for standard temperature data, the stored standard data are processed every 1-3 h to complete the curve and fitting of the standard temperature data, and then the change characteristics of the standard temperature data under the specific parameters are summarized by using an induction algorithm system to form a standard database.
And storing the standard temperature data once every 60s by the temperature value measured by each temperature measuring node, and processing the stored standard data every 2 h.
In step S4, the specific process of comparing each temperature value with the standard temperature of the standard database is as follows:
and finding a standard temperature of a temperature detection point corresponding to the temperature value in a standard database, and finding a difference value T between the standard temperature and the temperature value, wherein if the difference value T exceeds a threshold value K, the cable water enters the temperature detection point corresponding to the temperature value, and the threshold value is the temperature characteristic change difference of the filling layer material before and after the filling layer temperature measurement point enters the water at the point.
Compared with the prior art, the invention has the following advantages:
1. the cable water inlet detection method based on the thermal parameter time change of the filling layer material compares the temperature detected by the temperature detection point detected on line with a standard database made in advance to judge whether the cable enters water or not and can accurately determine the water inlet position.
2. The cable water inflow detection method based on the thermal parameter time change of the filling layer material improves the reliability and timeliness of cable water inflow monitoring, and has great social and economic benefits for ensuring the operation stability of a power grid and the operation reliability of a cable.
Drawings
Fig. 1 is a flow chart of a cable water inflow detection method based on time variation of thermal parameters of a filling layer material according to the invention.
Fig. 2 is a distributed optical fiber temperature sensor layout diagram of embodiment 1 of the present invention.
Fig. 3 is a distributed optical fiber temperature sensor arrangement diagram of embodiment 2 of the present invention.
Wherein, 1 is the cable, 2 is the filling layer, and 3 is distributed optical fiber temperature sensor.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1
The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material, as shown in fig. 1, comprises the following steps:
s1, placing a temperature sensor in the filling layer of the cable; the temperature sensor is a distributed optical fiber temperature sensor, and as shown in fig. 3, the distributed optical fiber temperature sensor in this embodiment has a spiral distribution.
S2, calibrating a plurality of temperature detection points along the axial direction of the cable, wherein the distance between every two adjacent temperature detection points is D, and sequencing the temperature detection points along the axial direction of the cable; the distance in this embodiment is 20cm, and is a proper distance to ensure the accuracy of the detection result.
S3, recording the temperature value of each temperature detection point after the cable runs stably;
and S4, comparing each temperature value with the standard temperature of the standard database, and judging whether the cable position where the temperature value is relative is water or not according to the comparison result.
Specifically, the filling layer of the cable has the characteristic of water absorption expansion, and after the filling layer absorbs water and expands, the thermal parameters of the filling layer can change within a certain time. And arranging a distributed optical fiber temperature sensor in the filling layer, monitoring the temperature change of the filling layer by using the distributed optical fiber temperature sensor, and comparing the detected temperature with the standard temperature of a standard database to judge whether the cable enters water or not and the position of the cable entering water.
The specific process of comparing each temperature value with the standard temperature of the standard database is as follows: and finding a standard temperature of a temperature detection point corresponding to the temperature value in a standard database, and finding a difference value T between the standard temperature and the temperature value, wherein if the difference value T exceeds a threshold value K, the cable water enters the temperature detection point corresponding to the temperature value, and the threshold value is the temperature characteristic change difference of the filling layer material before and after the filling layer temperature measurement point enters the water at the point. In the comparison process, under the parameters of temperature, humidity, load on the cable, running time of the cable and the like in the same environment, the standard temperature in the standard database is compared with the temperature value detected by the temperature detection point to obtain a difference value T between the standard temperature and the detected temperature value, and whether the difference value exceeds a threshold value K or not is judged, so that whether water enters the cable corresponding to the temperature detection point or not is judged.
The standard temperature of the standard database in step S4 is obtained by collecting the normal cable under the condition of specific parameters including the cable running time, humidity and the load on the cable.
The standard database is established specifically as follows:
selecting a cable with a certain normal length, marking temperature measurement nodes according to a certain distance along the axial direction of the cable, and sequencing the temperature measurement nodes;
after the cable normally runs, under specific parameters, the temperature values measured by each temperature measuring node are stored once every 30-90 s for standard temperature data, the stored standard data are processed every 1-3 h to complete the curve and fitting of the standard temperature data, and then the change characteristics of the standard temperature data under the specific parameters are summarized by using an induction algorithm system to form a standard database. Specifically, the temperature value measured by each temperature measurement node stores standard temperature data every 60s, and the stored standard data is processed every 2h, and the distance between every two adjacent temperature measurement nodes is 0.5 m.
Example 2
The cable water inlet detection method based on the thermal parameter time change of the filling layer material is the same as the embodiment 1 except for the following technical characteristics: as shown in fig. 2, the distributed optical fiber temperature sensors are distributed in a spiral or straight line. The distribution mode is convenient for the arrangement of the distributed optical fiber temperature sensors, is convenient to operate, and can accurately detect the temperature of the temperature detection points.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A cable water inlet detection method based on thermal parameter time change of a filling layer material is characterized by comprising the following steps: the method comprises the following steps:
s1, placing a temperature sensor in the filling layer of the cable;
s2, calibrating a plurality of temperature detection points along the axial direction of the cable, wherein the distance between every two adjacent temperature detection points is D;
s3, recording the temperature value of each temperature detection point after the cable runs stably;
and S4, comparing each temperature value with the standard temperature of the standard database, and judging whether the cable position where the temperature value is relative is water or not according to the comparison result.
2. The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material according to claim 1, wherein the method comprises the following steps: in step S1, the temperature sensor is a distributed optical fiber temperature sensor, and the distributed optical fiber temperature sensor is distributed spirally or linearly.
3. The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material according to claim 1, wherein the method comprises the following steps: the standard temperature of the standard database in step S4 is obtained by collecting the normal cable under the condition of specific parameters including the cable running time, humidity and the load on the cable.
4. The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material according to claim 3, wherein the method comprises the following steps: the standard database is established specifically as follows:
selecting a cable with a certain normal length, marking temperature measurement nodes according to a certain distance along the axial direction of the cable, and sequencing the temperature measurement nodes;
after the cable normally runs, under specific parameters, the temperature values measured by each temperature measuring node are stored once every 30-90 s for standard temperature data, the stored standard data are processed every 1-3 h to complete the curve and fitting of the standard temperature data, and then the change characteristics of the standard temperature data under the specific parameters are summarized by using an induction algorithm system to form a standard database.
5. The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material according to claim 4, wherein the method comprises the following steps: and storing the standard temperature data once every 60s by the temperature value measured by each temperature measuring node, and processing the stored standard data every 2 h.
6. The method for detecting the water inflow of the cable based on the time change of the thermal parameters of the filling layer material according to claim 1, wherein the method comprises the following steps: in step S4, the specific process of comparing each temperature value with the standard temperature of the standard database is as follows:
and finding a standard temperature of a temperature detection point corresponding to the temperature value in a standard database, and finding a difference value T between the standard temperature and the temperature value, wherein if the difference value T exceeds a threshold value K, the cable water enters the temperature detection point corresponding to the temperature value, and the threshold value is the temperature characteristic change difference of the filling layer material before and after the filling layer temperature measurement point enters the water at the point.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112094471A (en) * | 2020-09-22 | 2020-12-18 | 中电保力（北京）科技有限公司 | Composite test material for testing whether cable is water-entering or not and preparation method and application thereof |
| CN112111120A (en) * | 2020-09-22 | 2020-12-22 | 中电保力（北京）科技有限公司 | Composite test material with light transmittance changing along with humidity, and preparation method and application thereof |
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| CN112111120A (en) * | 2020-09-22 | 2020-12-22 | 中电保力（北京）科技有限公司 | Composite test material with light transmittance changing along with humidity, and preparation method and application thereof |
| CN112094471B (en) * | 2020-09-22 | 2022-02-08 | 中电保力（北京）科技有限公司 | Composite test material for testing whether cable is water-entering or not and preparation method and application thereof |
| CN112111120B (en) * | 2020-09-22 | 2022-04-29 | 中电保力（北京）科技有限公司 | Composite test material with light transmittance changing along with humidity, and preparation method and application thereof |
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Address after: 511356 No. 19, Yongfeng Road, Yonghe Economic Zone, Guangzhou economic and Technological Development Zone, Guangdong Applicant after: Guangzhou Nanyang cable group Co.,Ltd. Applicant after: SOUTH CHINA University OF TECHNOLOGY Address before: 511356 No. 19, Yongfeng Road, Yonghe Economic Zone, Guangzhou economic and Technological Development Zone, Guangdong Applicant before: GUANGZHOU NANYANG CABLE Co.,Ltd. Applicant before: SOUTH CHINA University OF TECHNOLOGY |
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Application publication date: 20200922 |
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