CN110988612A - Cable head insulation performance online monitoring system and method - Google Patents
Cable head insulation performance online monitoring system and method Download PDFInfo
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- CN110988612A CN110988612A CN201911089983.XA CN201911089983A CN110988612A CN 110988612 A CN110988612 A CN 110988612A CN 201911089983 A CN201911089983 A CN 201911089983A CN 110988612 A CN110988612 A CN 110988612A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
Abstract
The embodiment of the invention discloses a cable head insulation performance on-line monitoring system and a cable head insulation performance on-line monitoring method, wherein the cable head insulation performance on-line monitoring system comprises an X-ray monitoring module, an infrared monitoring module, an ultrasonic monitoring module and a terminal host computer, wherein the X-ray monitoring module, the infrared monitoring module and the ultrasonic monitoring module are used for monitoring the state of a cable head; the terminal host compares and analyzes the received temperature distribution data and ultrasonic detection data with the stored similar reference data, and judges the insulation performance of the cable head and the reasons of the fault or defect, so that the state in the cable head can be accurately observed, and the defect that the internal defect of the cable head cannot be found is avoided; and the reference data for judgment is provided, so that the condition that the judgment of the cable head state is inconsistent due to the difference of work experience, professional skills and the like of inspectors is avoided, and the data is conveniently recorded and unified.
Description
Technical Field
The embodiment of the invention relates to the technical field of power monitoring, in particular to a cable head insulation performance on-line monitoring system and method.
Background
The cable connector is also called a cable head, and after the cable is laid, in order to form a continuous line, all the sections of the cable must be connected into a whole, and the connection points are called cable connectors. The cable joint is used for locking and fixing the incoming and outgoing lines, plays the waterproof, dustproof and shockproof role, and the sheath of the cable joint is an insulating layer, so that the leakage condition is avoided, and the safe and stable operation of a power line is ensured.
The insulating layer of the cable head can age gradually along with the service time, so that the insulating property of the cable head is reduced, and the hidden troubles of power generation, thermal expansion, even explosion and the like at the cable head are caused. The problem that the fault occurs at the power cable joint is avoided, the joint quality is improved, meanwhile, the insulation performance of the cable joint is monitored regularly, defects and faults are found timely, and potential safety hazards are eliminated.
At present, in the link of normal inspection or accident investigation of electricity inspection personnel, the insulation performance and the running time of a cable head can not be rapidly and accurately judged by data support on site, the insulation performance and the running time of the cable head can not be judged by only depending on the skill and experience of personnel and by only analyzing and judging by naked eyes, the auxiliary of a professional instrument is lacked, the hidden defect and the hidden fault of the cable head can not be accurately found, and the potential safety hazard can not be thoroughly eliminated.
Disclosure of Invention
Therefore, the embodiment of the invention provides a system and a method for monitoring the insulation performance of a cable head on line, which aim to solve the problem that the defects and faults of the cable head cannot be eliminated in time in the prior art because no professional instrument is used for assisting.
In order to achieve the above object, the embodiment of the present invention discloses the following technical solutions:
a cable head insulation performance on-line monitoring system and method, including X-ray monitoring module 100, infrared monitoring module 200, ultrasonic monitoring module 300, and terminal host 400;
the X-ray monitoring module 100 performs X-ray digital photographing on the cable head and transmits the acquired digital image to the terminal host 400;
the infrared monitoring module 200 analyzes and images the temperature distribution of the cable head, determines a temperature abnormal region by comparing with a temperature difference standard, and transmits the acquired temperature distribution data to the terminal host 400;
the ultrasonic monitoring module 300 performs ultrasonic detection on the abnormal temperature region and sends ultrasonic detection data to the terminal host 400;
the terminal host 400 compares and analyzes the received temperature distribution data and ultrasonic detection data with stored similar reference data, and then judges the insulation performance of the cable head and the reasons of the fault or defect.
Further, the reference data comprises a mechanical damage reference image, temperature distribution reference data and ultrasonic detection reference data; the terminal host 400 is internally provided with three reference databases for storing the corresponding reference data, and the X-ray monitoring module, the infrared monitoring module and the ultrasonic monitoring module are connected with the corresponding reference databases.
Further, an instruction sending module is arranged in the terminal host 400, the sending module is connected with a reference database storing the temperature distribution reference data, and the instruction sending module generates an instruction according to the temperature distribution data.
Further, the ultrasonic monitoring module 300 comprises an instruction receiving module and a position adjusting module, the instruction sending module is connected with the position adjusting module and the instruction receiving module is connected with the instruction receiving module, the instruction receiving module is used for receiving the instruction sent to the position adjusting module, the position adjusting module adjusts the ultrasonic monitoring module 300, and the ultrasonic monitoring module 300 is used for detecting the temperature abnormal area on the cable head.
Further, the connection modes of the X-ray monitoring module 100, the infrared monitoring module 200, and the ultrasonic monitoring module 300 and the terminal host 400 are all wireless connections.
Further, all three reference databases can be updated by means of human editing.
A cable head insulation performance on-line monitoring method comprises the following steps:
s100, the X-ray monitoring module 100 performs X-ray irradiation and digital imaging on the cable head in the running state, and sends the digital imaging to the terminal host 400 for storage and display;
s200, the infrared monitoring module 200 partitions the cable head, detects, analyzes and images the temperature of each area on the cable head, and sends the temperature distribution data of the cable head to the terminal host 400;
s300, the terminal host 400 compares and analyzes the temperature distribution data with the programmed temperature difference standard, determines a temperature abnormal area on the cable head, and sends a corresponding instruction to the ultrasonic monitoring module 300;
s400, the ultrasonic monitoring module 300 performs ultrasonic detection on the temperature abnormal area according to the instruction, and feeds ultrasonic detection data back to the terminal host 400;
s500, the terminal host 400 compares and analyzes the temperature distribution data and the ultrasonic detection data with the similar reference data respectively, and judges the insulation performance of the cable head and the defect reason.
Furthermore, the subareas comprise a sheath grounding area, a terminal area, an umbrella skirt area, an oxidizing lightning arrester area and a root area, and correspond to the corresponding structural parts of the cable head.
Further, the temperature difference standard specifically includes:
a. the thermal image with the whole cable head as the center has a temperature difference of 0.5-1 ℃ which means that the cable head is affected with damp, deteriorated or has air gaps;
b. heating with a grounding area of the protective layer as a center, wherein poor contact is achieved at a temperature difference of 5-10 ℃;
c. the umbrella skirt area is overheated, and the temperature difference is 0.5-1 ℃ so that partial discharge exists in the cable head;
d. the root is subjected to integral overheating, and the temperature difference is 0.5-1 ℃ when the internal medium is affected with damp or has abnormal performance;
e. the oxidizing lightning arrester is abnormal in overall heating or local heating, the temperature difference is 0.5-1 ℃, and the valve plate is affected with damp or aged;
f. the terminal area generates heat, and the temperature difference does not exceed 15 ℃ which is a common defect; the hot spot temperature is more than 90 ℃ or delta is more than or equal to 80 percent, which is a serious defect; the hot spot temperature is more than 130 ℃ or delta is more than or equal to 95 percent, which is a critical defect, and the failure is caused by poor contact of the joint.
Wherein δ ═ [ (T1-T2) ÷ (T1-T0) ] × 100%, T1 is the fault phase temperature, T2 is the normal phase temperature, and T0 is the ambient temperature.
The embodiment of the invention has the following advantages:
the cable head is monitored through the X-ray monitoring module, the infrared monitoring module and the ultrasonic monitoring module, so that the state inside the cable head can be accurately observed, and the defect that the internal defect of the cable head cannot be found is avoided; and moreover, reference data for judgment is provided, so that the condition that the judgment of the cable head state is inconsistent due to differences of work experience, professional skills and the like of inspectors is avoided. The cable head insulation performance and defect reasons can be conveniently judged by inspectors, and meanwhile, data can be conveniently recorded and unified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a system block diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of an information processing process according to an embodiment of the present invention.
In the figure:
a 100-X-ray monitoring module; 200-an infrared monitoring module; 300-an ultrasonic monitoring module; 400-end host.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention discloses a cable head insulation performance online monitoring system and method, which includes an X-ray monitoring module 100, an infrared monitoring module 200, an ultrasonic monitoring module 300, and a terminal host 400.
The X-ray monitoring module 100 performs X-ray digital photographing on the cable head, and sends the acquired digital image to the terminal host 400 for storage and display, so that an inspector can check the digital image and judge the degree of mechanical damage.
As shown in fig. 2, the infrared monitoring module 200 analyzes and images the temperature distribution of the cable head, determines a temperature abnormal area by comparing with a temperature difference standard, and sends the acquired temperature distribution data to the terminal host 400 (CPU); the ultrasonic monitoring module 300 performs ultrasonic detection on the temperature abnormal region, and sends ultrasonic detection data to the terminal host 400(CPU) after passing through a preamplifier circuit, a filter circuit, voltage boosting, and a/D conversion.
The terminal host 400 may be a mobile phone, a tablet computer, or the like, and is convenient for observing the fed back digital image, infrared image, and ultrasonic image while realizing data processing and transmission.
Specifically, by carrying out X-ray radiography on the cable head with hidden danger, the mechanical injury of the cable head can be clearly seen at the display end. And the X-ray monitoring module 100 adopts the X-ray digital photographing technology, has the advantages of high sensitivity, lower resolution, capability of effectively reducing the ray dose, short detection time, high detection efficiency and larger latitude, does not need the film developing link of a darkroom, greatly reduces the environmental pollution, also meets the requirement of on-site on-line monitoring, can provide reliable data for inspectors in time, and improves the working efficiency.
The infrared monitoring module 200 can be understood as an infrared temperature measurement component in an infrared thermometer, can detect the temperature of the cable head, and can display the temperature on the terminal host 400 or other display terminals, so that an inspector can visually see the temperature distribution conditions of all places on the cable head, the inspector can assist the inspector in quickly judging the insulation performance and defect reasons of the cable head, and the inspector can also refer to or adopt the judgment result of the terminal host 400.
The terminal host 400 compares and analyzes the temperature distribution data with the programmed temperature difference standard to determine the temperature abnormal area on the cable head, feeds the temperature abnormal area back to the ultrasonic wave detection module 300, adjusts the ultrasonic wave monitoring module 300, enables the ultrasonic wave monitoring module 300 to further detect the temperature abnormal area of the cable head, and detects the internal conditions of the insulating layer, such as aging, breakdown and the like.
In addition, the terminal host 400 receives the mechanical damage data, the temperature distribution data and the ultrasonic detection data, compares and analyzes the received data with the stored similar reference data, and then judges the mechanical damage degree, the temperature difference degree, the aging degree, the breakdown degree and the like, thereby judging the insulation performance of the cable head and the fault or defect reasons
The reference data comprise a mechanical damage reference image, temperature distribution reference data and ultrasonic detection reference data, and the mechanical damage reference image is an X-ray digital image comprising a mechanical damage image of each component of the cable head; the temperature distribution reference data is a set temperature difference standard, and different defects or faults correspond to different infrared data difference values; the ultrasonic detection reference data is a sound wave range difference marking table, and different ultrasonic data difference values correspond to different defects.
Monitoring and analysis through professional equipment provide professional support for the inspection personnel to the judgement of cable head state, simultaneously, also provide the reference data that are used for judging, avoided because differences such as inspection personnel's work experience, professional skill, and lead to the inconsistent condition emergence of cable head state judgement, when making things convenient for inspection personnel to judge cable head insulating properties, defect reason, the record and the unity of the data of being convenient for.
In addition, three reference databases for storing the corresponding reference data are arranged in the terminal host 400, and the ray monitoring module, the infrared monitoring module and the ultrasonic monitoring module are connected with the corresponding reference databases to realize one-to-one butt joint of the data and the reference databases, so that the data processing speed is increased.
The terminal host 400 is internally provided with an instruction sending module, the sending module is connected with a reference database storing the temperature distribution reference data, and the instruction sending module generates an instruction corresponding to the temperature abnormal area according to the temperature distribution data; the ultrasonic monitoring module 300 comprises an instruction receiving module and a position adjusting module, the instruction sending module is connected with the position adjusting module and is connected with the instruction receiving module, the instruction receiving module is used for receiving the instruction, the instruction is sent to the position adjusting module, the position adjusting module is used for adjusting the ultrasonic monitoring module 300, and the ultrasonic monitoring module 300 is used for detecting a temperature abnormal area on a cable head.
In addition, the connection modes of the X-ray monitoring module 100, the infrared monitoring module 200 and the ultrasonic monitoring module 300 with the terminal host 400 are wireless connections, which is convenient for use in cable ducts and aerial work and other inconvenient cable installation.
In addition, the three reference databases can update the reference data in a manual editing mode so as to calibrate and update the system, so that the system can better meet the requirement of actual use.
The embodiment of the invention also discloses an on-line monitoring method for the insulation performance of the cable head, which comprises the following steps:
s100, the X-ray monitoring module 100 performs X-ray irradiation and digital imaging on the cable head in a running state, and sends the digital imaging to the terminal host 400 in the form of mechanical damage data;
s200, the infrared monitoring module 200 partitions the cable head, detects, analyzes and images the temperature of each area on the cable head, and sends the temperature distribution data of the cable head to the terminal host 400;
s300, the terminal host 400 compares and analyzes the temperature distribution data with the programmed temperature difference standard, determines a temperature abnormal area on the cable head, and sends a corresponding instruction to the ultrasonic monitoring module 300;
s400, the ultrasonic monitoring module 300 performs ultrasonic detection on the temperature abnormal area according to the instruction, and feeds ultrasonic detection data back to the terminal host 400;
s500, the terminal host 400 compares and analyzes the mechanical damage data, the temperature distribution data and the ultrasonic detection data with the similar reference data respectively, and judges the insulation performance of the cable head and the defect reason.
The subareas comprise a sheath grounding area, a terminal area, an umbrella skirt area, an oxidizing lightning arrester area and a root area, and correspond to corresponding structural parts of the cable head.
Wherein the temperature difference standard specifically comprises:
a. the thermal image with the whole cable head as the center has a temperature difference of 0.5-1 ℃ which means that the cable head is affected with damp, deteriorated or has air gaps;
b. heating with a grounding area of the protective layer as a center, wherein poor contact is achieved at a temperature difference of 5-10 ℃;
c. the umbrella skirt area is overheated, and the temperature difference is 0.5-1 ℃ so that partial discharge exists in the cable head;
d. the root is subjected to integral overheating, and the temperature difference is 0.5-1 ℃ when the internal medium is affected with damp or has abnormal performance;
e. the oxidizing lightning arrester is abnormal in overall heating or local heating, the temperature difference is 0.5-1 ℃, and the valve plate is affected with damp or aged;
f. the terminal area generates heat, and the temperature difference does not exceed 15 ℃ which is a common defect; the hot spot temperature is more than 90 ℃ or delta is more than or equal to 80 percent, which is a serious defect; the hot spot temperature is more than 130 ℃ or delta is more than or equal to 95 percent, which is a critical defect, and the failure is caused by poor contact of the joint.
Wherein δ ═ [ (T1-T2) ÷ (T1-T0) ] × 100%, T1 is the fault phase temperature, T2 is the normal phase temperature, and T0 is the ambient temperature.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. An on-line cable head insulation performance monitoring system is characterized by comprising an X-ray monitoring module 100, an infrared monitoring module 200, an ultrasonic monitoring module 300 and a terminal host 400;
the X-ray monitoring module 100 performs X-ray digital photographing on the cable head and transmits the acquired digital image to the terminal host 400;
the infrared monitoring module 200 analyzes and images the temperature distribution of the cable head, determines a temperature abnormal region by comparing with a temperature difference standard, and transmits the acquired temperature distribution data to the terminal host 400;
the ultrasonic monitoring module 300 performs ultrasonic detection on the abnormal temperature region and sends ultrasonic detection data to the terminal host 400;
the terminal host 400 compares and analyzes the received temperature distribution data and ultrasonic detection data with stored similar reference data, and then judges the insulation performance of the cable head and the reasons of the fault or defect.
2. The system for monitoring the insulation performance of the cable head on the line according to claim 1, wherein the reference data comprises a mechanical damage reference image, temperature distribution reference data and ultrasonic detection reference data; the terminal host 400 is internally provided with three reference databases for storing the corresponding reference data, and the X-ray monitoring module, the infrared monitoring module and the ultrasonic monitoring module are connected with the corresponding reference databases.
3. The system according to claim 2, wherein a command sending module is disposed in the terminal host 400, the sending module is connected to a reference database storing the temperature distribution reference data, and the command sending module generates the command according to the temperature distribution data.
4. The cable head insulation performance on-line monitoring system according to claim 3, wherein the ultrasonic monitoring module 300 comprises a command receiving module and a position adjusting module, the command sending module is connected with the command receiving module, the command receiving module sends the received command to the position adjusting module, and the position adjusting module adjusts the ultrasonic monitoring module 300 so that the ultrasonic monitoring module 300 detects a temperature abnormal area on the cable head.
5. The cable head insulation performance on-line monitoring system according to claim 1, wherein the X-ray monitoring module 100, the infrared monitoring module 200 and the ultrasonic monitoring module 300 are all connected to the terminal host 400 in a wireless manner.
6. The system for on-line monitoring of insulation performance of cable head according to claim 2, wherein all three of the reference databases are updated by human editing.
7. An on-line cable head insulation performance monitoring method is applied to the on-line cable head insulation performance monitoring system of any one of claims 1 to 6, and comprises the following steps:
s1, the X-ray monitoring module 100 performs X-ray irradiation and digital imaging on the cable head in the running state, and sends the digital imaging to the terminal host 400 for storage and display;
s2, the infrared monitoring module 200 partitions the cable head, detects, analyzes and images the temperature of each area on the cable head, and sends the temperature distribution data of the cable head to the terminal host 400;
s3, the terminal host 400 compares and analyzes the temperature distribution data with the programmed temperature difference standard, determines a temperature abnormal area on the cable head, and sends a corresponding instruction to the ultrasonic monitoring module 300;
s4, the ultrasonic monitoring module 300 performs ultrasonic detection on the abnormal temperature region according to the instruction, and feeds back ultrasonic detection data to the terminal host 400;
and S5, the terminal host 400 compares and analyzes the temperature distribution data and the ultrasonic detection data with the similar reference data respectively, and judges the insulation performance of the cable head and the defect reason.
8. The method according to claim 7, wherein the sub-regions include a sheath grounding region, a terminal region, a shed region, an oxidizing lightning arrester region, and a root region, and correspond to corresponding structural portions of the cable head.
9. The cable head insulation performance online monitoring method according to claim 7, wherein the temperature difference standard specifically comprises:
a. the thermal image with the whole cable head as the center has a temperature difference of 0.5-1 ℃ which means that the cable head is affected with damp, deteriorated or has air gaps;
b. heating with a grounding area of the protective layer as a center, wherein poor contact is achieved at a temperature difference of 5-10 ℃;
c. the umbrella skirt area is overheated, and the temperature difference is 0.5-1 ℃ so that partial discharge exists in the cable head;
d. the root is subjected to integral overheating, and the temperature difference is 0.5-1 ℃ when the internal medium is affected with damp or has abnormal performance;
e. the oxidizing lightning arrester is abnormal in overall heating or local heating, the temperature difference is 0.5-1 ℃, and the valve plate is affected with damp or aged;
f. the terminal area generates heat, and the temperature difference does not exceed 15 ℃ which is a common defect; the hot spot temperature is more than 90 ℃ or delta is more than or equal to 80 percent, which is a serious defect; the hot spot temperature is more than 130 ℃ or delta is more than or equal to 95 percent, which is an emergency defect, and the failure is caused by poor contact of the joint;
wherein δ ═ [ (T1-T2) ÷ (T1-T0) ] × 100%, T1 is the fault phase temperature, T2 is the normal phase temperature, and T0 is the ambient temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112964389A (en) * | 2021-05-10 | 2021-06-15 | 国网江西省电力有限公司电力科学研究院 | Elbow type cable head fault early warning method and system based on distributed temperature measurement |
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