CN113138048A - Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound - Google Patents
Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound Download PDFInfo
- Publication number
- CN113138048A CN113138048A CN202110320312.0A CN202110320312A CN113138048A CN 113138048 A CN113138048 A CN 113138048A CN 202110320312 A CN202110320312 A CN 202110320312A CN 113138048 A CN113138048 A CN 113138048A
- Authority
- CN
- China
- Prior art keywords
- interface pressure
- stress
- ultrasonic
- cable joint
- nondestructive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
- G01N29/326—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise compensating for temperature variations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02872—Pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a cable joint interface pressure nondestructive live-line detection method based on stress ultrasound, which comprises an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic stress analysis module, a stress/interface pressure conversion module and an interface pressure alarm module. The ultrasonic transmitter is used for sending out an ultrasonic signal; the ultrasonic receiver is used for receiving an ultrasonic signal sent by the ultrasonic transmitter; and the ultrasonic stress analysis module is used for converting the ultrasonic signal into the self-tightening stress of the cold-shrink tube. The stress/interface pressure conversion module is used for converting the self-tightening stress of the cold-shrink tube into the interface pressure of the cable joint; and the interface pressure alarm module is used for alarming when the measured value of the interface pressure is smaller than the alarm threshold value of the interface pressure. The invention can know the interface pressure condition of the cold shrink tube of the cable intermediate joint in time, reduce the occurrence of cable joint explosion accidents caused by insufficient interface pressure and improve the power supply reliability.
Description
Technical Field
The invention belongs to the technical field of explosion-proof early warning of electrical equipment, and particularly relates to a nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound.
Background
Compared with overhead transmission lines, the power cable has the advantages of light weight, small occupied area, convenience in maintenance, small environmental influence and the like, so that the power cable is widely applied to a power system, and the operation reliability of the power cable is directly related to the stability and safety of the operation of a power grid system. Due to the restriction of factors such as manufacturing level, construction conditions, environmental conditions and the like, a cable joint is easy to become a weak link of a cable, and partial discharge or insulation aging and other conditions occur during operation, so that the interface pressure between a silicon rubber/polyethylene interface of the cable joint is reduced, and finally, the interface pressure is reduced to be out of an allowable range, so that local temperature rise is too high, explosion is caused in severe cases, and serious economic loss and casualties are caused. Therefore, the nondestructive live detection of the interface pressure of the power cable has important application value for the operation reliability of the power system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cable joint interface pressure nondestructive live-line detection method based on stress ultrasound aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a cable joint interface pressure nondestructive live-line detection method based on stress ultrasound comprises an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic stress analysis module, a stress/interface pressure conversion module and an interface pressure alarm module;
the ultrasonic transmitter is used for transmitting ultrasonic signals, and the propagation speeds of the ultrasonic signals are different when the ultrasonic signals pass through media with different self-tightening stresses (acoustic elasticity theory). The ultrasonic receiver is used for receiving the ultrasonic signal sent by the ultrasonic transmitter. The ultrasonic stress analysis module is used for analyzing and processing the transmitted and received ultrasonic signals and calculating the self-tightening stress of the cable joint cold-shrink tube at the moment. The stress/interface pressure conversion module is used for converting the self-tightening stress of the cold-shrink tube into the interface pressure of the cable joint; the interface pressure alarm module is used for comparing the interface pressure measured in real time with an interface pressure alarm threshold value and giving an alarm in time once the interface pressure is smaller than the early warning value.
Preferably, the emitting and receiving frequencies of the ultrasonic transmitter and the ultrasonic receiver are in accordance with the nyquist sampling theorem.
Preferably, the installation positions of the ultrasonic transmitter and the ultrasonic receiver are horizontally symmetrical at 180 ℃ and are vertically incident.
Preferably, the ultrasonic transmitter and the ultrasonic receiver are extremely small in thickness.
Preferably, the ultrasonic transmitter and the ultrasonic receiver mounted on the cold-shrink tube of the cable joint can be bent and attached to the surface of the cold-shrink tube in a proper amount.
Preferably, the ultrasonic transmitter and the ultrasonic receiver integrate a temperature sensor.
Preferably, the ultrasonic stress analysis module can eliminate the influence of temperature on the detection result through temperature compensation.
Preferably, the interface pressure alarm module presets an alarm value after the installation is finished.
Preferably, the interface pressure alarm module can display the safety margin between the current radial stress of the cold-shrink tube and the radial stress corresponding to the alarm value in real time.
The method has reasonable design, can know the interface pressure state of the cold shrink tube of the cable intermediate joint in time, reduces unnecessary maintenance tests, reduces the occurrence of cable fire and explosion accidents, further obviously improves the reliability and safety of power supply, and provides conditions for converting planned maintenance or post-accident rush repair into state maintenance.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention. Fig. 2 is a schematic structural diagram of a cable joint. Fig. 3 is a schematic diagram illustrating a circumferential stress f1, a radial stress f2 and an interface pressure p at a certain position of a cold shrink tube of a cable joint.
Fig. 2 shows that the interface pressure of the cable joint is provided by the radial contraction force of the cold-shrink tube, regardless of the material of the outside of the cold-shrink tube, so that the ultrasonic detection value of the outside material can be set to a constant value without consideration when performing correlation analysis, and the change of the ultrasonic detection value is caused only by the change of the radial contraction force of the cold-shrink tube.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments.
Examples
As shown in fig. 1, the present embodiment provides a nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound, which includes an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic stress analysis module, a stress/interface pressure conversion module, and an interface pressure alarm module;
the ultrasonic transmitter is used for sending an ultrasonic signal, and when the ultrasonic signal passes through the cable joint cold-shrinkable tube, the propagation speed of the ultrasonic signal is related to the self-tightening stress of the cold-shrinkable tube according to the acoustoelastic theory (the circumferential stress f of the cold-shrinkable tube is referred to herein as the circumferential stress f of the cold-shrinkable tube)1). The ultrasonic receiver is used for receiving ultrasonic signals, and the ultrasonic signals reach the ultrasonic receiver from the transmitter through the cold shrink tube, the cable body and the cold shrink tube. The ultrasonic stress analysis module is used for analyzing the time difference delta t between the sending and receiving of the ultrasonic signal1And according to the time difference Deltat1Calculating the self-tightening stress, i.e. the circumferential stress f, of the cold-shrink tube1. (the ultrasonic signal and the self-tightening stress can be established by measuring the ultrasonic signal at the moment when the self-tightening stress is continuously changed in a laboratory, so that f can be established1And ultrasonic signal Δ t1Relation of (a), (b), (c) and (d)1＝F(Δt1),). The stress/interface pressure conversion module is used for converting the circumferential stress f of the cold-shrink tube1Conversion to the interface pressure p of the cable joint, interpretation of the conversion: stress in the circumferential direction f1The resultant stress is the radial stress f2(i.e., f can be established)1And f2Relation of (a), (b), (c) and (d)2＝F(f1) F) and radial stress f2Is positively correlated with the interfacial pressure p (i.e., f can be established)2With p, p ═ F (F)2) Therefore, circumferential stress f)1And is also positively correlated with the interfacial pressure p (i.e., the two formulae can be combined to eliminate f2Thereby establishing f1In relation to p, p ═ F (F)1) ); the interface pressure alarm module is used for measuring the interface pressure in real time and the interface pressure alarm threshold valueAnd comparing, and alarming in time once the alarm value is less than the early warning value.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (8)
1. A cable joint interface pressure nondestructive live-line detection method based on stress ultrasound comprises an ultrasonic transmitter (1), an ultrasonic receiver (2), an ultrasonic stress analysis module (3), a stress/interface pressure conversion module (4) and an interface pressure alarm module (5);
the method is characterized in that: the ultrasonic transmitter (1) is used for transmitting an ultrasonic signal, and the propagation speed of the ultrasonic signal is related to the radial stress of the cold shrinkage pipe when the ultrasonic signal passes through the cable joint cold shrinkage pipe; the ultrasonic receiver (2) is used for receiving the ultrasonic signal sent by the ultrasonic transmitter (1); the ultrasonic stress analysis module (3) is used for analyzing the time difference delta t between the sending and receiving of the ultrasonic signal1And obtaining real-time data of the self-tightening stress of the cold-shrink tube according to the time difference; the stress/interface pressure conversion module (4) is used for converting the self-tightening stress of the cold-shrink tube into the interface pressure of the cable joint; the interface pressure alarm module (5) is used for comparing the interface pressure measured in real time with an interface pressure alarm threshold value and giving an alarm in time once the interface pressure is smaller than the early warning value.
2. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the installation positions of the ultrasonic transmitter and the ultrasonic receiver are horizontally symmetrical at 180 ℃ and vertically incident.
3. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the ultrasound transmitter and receiver are extremely thin.
4. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the ultrasonic transmitter and the ultrasonic receiver which are arranged on the cable joint cold shrinkage pipe can be bent in a proper amount and attached to the surface of the cold shrinkage pipe.
5. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the ultrasonic transmitter and the ultrasonic receiver integrate a temperature sensor.
6. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the ultrasonic stress analysis module can eliminate the influence of temperature on the detection result through temperature compensation.
7. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: and the interface pressure alarm module presets an alarm value after the installation is finished.
8. The nondestructive live detection method for the cable joint interface pressure based on the stress ultrasound as claimed in claim 1, wherein the method comprises the following steps: the interface pressure alarm module can display the safety margin between the current interface pressure and the interface pressure corresponding to the alarm value in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110320312.0A CN113138048A (en) | 2021-03-25 | 2021-03-25 | Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110320312.0A CN113138048A (en) | 2021-03-25 | 2021-03-25 | Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113138048A true CN113138048A (en) | 2021-07-20 |
Family
ID=76810465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110320312.0A Pending CN113138048A (en) | 2021-03-25 | 2021-03-25 | Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113138048A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279607A (en) * | 2021-12-27 | 2022-04-05 | 四川大学 | Cable joint interface pressure monitoring method and device based on acoustic elastic effect |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424243A (en) * | 2016-01-06 | 2016-03-23 | 北京理工大学 | Torsion residual stress ultrasonic nondestructive test method |
| CN105890835A (en) * | 2016-03-21 | 2016-08-24 | 广州供电局有限公司 | Measuring method for interface pressure of thermal-contraction intermediate connector of cable |
| CN106404250A (en) * | 2016-03-21 | 2017-02-15 | 广州供电局有限公司 | Cable cold shrink intermediate joint interface pressure measuring apparatus and method thereof |
| CN108008016A (en) * | 2018-01-03 | 2018-05-08 | 国网安徽省电力有限公司电力科学研究院 | Power cable and connector nondestructive detection system and method based on X-ray and ultrasonic in combination detection |
| CN207379983U (en) * | 2017-11-13 | 2018-05-18 | 广东电网有限责任公司电力科学研究院 | A kind of cable connector internal flaw detection system |
| CN109406032A (en) * | 2018-12-28 | 2019-03-01 | 长园电力技术有限公司 | A kind of cable accessory interfacial pressure online testing device |
| CN110220628A (en) * | 2019-07-03 | 2019-09-10 | 四川大学 | A method of expanding radial force when measurement cable intermediate joint operation |
| CN209927964U (en) * | 2019-04-23 | 2020-01-10 | 国网江苏省电力有限公司扬州供电分公司 | Power cable intermediate head insulation state on-line measuring device |
| CN112083294A (en) * | 2020-07-30 | 2020-12-15 | 西安交通大学 | Method for nondestructive evaluation of silicon rubber cable joint state by utilizing ultrasonic sound velocity |
-
2021
- 2021-03-25 CN CN202110320312.0A patent/CN113138048A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424243A (en) * | 2016-01-06 | 2016-03-23 | 北京理工大学 | Torsion residual stress ultrasonic nondestructive test method |
| CN105890835A (en) * | 2016-03-21 | 2016-08-24 | 广州供电局有限公司 | Measuring method for interface pressure of thermal-contraction intermediate connector of cable |
| CN106404250A (en) * | 2016-03-21 | 2017-02-15 | 广州供电局有限公司 | Cable cold shrink intermediate joint interface pressure measuring apparatus and method thereof |
| CN207379983U (en) * | 2017-11-13 | 2018-05-18 | 广东电网有限责任公司电力科学研究院 | A kind of cable connector internal flaw detection system |
| CN108008016A (en) * | 2018-01-03 | 2018-05-08 | 国网安徽省电力有限公司电力科学研究院 | Power cable and connector nondestructive detection system and method based on X-ray and ultrasonic in combination detection |
| CN109406032A (en) * | 2018-12-28 | 2019-03-01 | 长园电力技术有限公司 | A kind of cable accessory interfacial pressure online testing device |
| CN209927964U (en) * | 2019-04-23 | 2020-01-10 | 国网江苏省电力有限公司扬州供电分公司 | Power cable intermediate head insulation state on-line measuring device |
| CN110220628A (en) * | 2019-07-03 | 2019-09-10 | 四川大学 | A method of expanding radial force when measurement cable intermediate joint operation |
| CN112083294A (en) * | 2020-07-30 | 2020-12-15 | 西安交通大学 | Method for nondestructive evaluation of silicon rubber cable joint state by utilizing ultrasonic sound velocity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279607A (en) * | 2021-12-27 | 2022-04-05 | 四川大学 | Cable joint interface pressure monitoring method and device based on acoustic elastic effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109781332B (en) | Method for controlling bolt pre-tightening force based on axial force and elongation | |
| CN111678629A (en) | Ultrasonic monitoring probe for internal service stress of ocean structural member | |
| CN109668672A (en) | Ultrasonic bolt pre-tightens force measuring method | |
| CN101587005A (en) | Acoustic velocimetry SF6 gas leakage monitoring and warning system | |
| CN106228107B (en) | A kind of supersonic guide-wave broken rail monitoring method based on independent component analysis | |
| US20200063892A1 (en) | Method for predicting valve leakage | |
| CN113138048A (en) | Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound | |
| WO2019024185A1 (en) | Method for detecting bearing temperature of railway passenger train and digital/analog integrated temperature sensor | |
| US6838622B2 (en) | Electrical lead-through bushing and system with the electrical bushing | |
| CN111795765A (en) | Nondestructive monitoring device and method for service stress of preload part | |
| CN111275936B (en) | Underwater oilfield facility safety protection monitoring system and method thereof | |
| CN112834871B (en) | High-voltage long-section cable insulation fault online monitoring system and method | |
| CN212363369U (en) | Integrated magnetostrictive liquid level meter | |
| CN111076854B (en) | Fiber bragg grating sensor for monitoring pressure of ship structure under wave load and application | |
| CN113447781A (en) | Pressure-hydrogen-temperature three-in-one comprehensive detection system and detection method for oiled paper condenser type casing | |
| CN216646699U (en) | GIS partial discharge sound-electricity joint detection system | |
| CN201429490Y (en) | Acoustic anemometry for SF6 gas-leakage monitoring and alarming system | |
| CN212008434U (en) | Intelligent monitoring and detecting system for defects and stress of in-service wind power bolts | |
| CN210004163U (en) | Explosion-proof type electromagnetic ultrasonic online detection system for corrosion reduction of oil-gas pipeline | |
| CN113063475A (en) | Multi-type sensor-based detection and alarm system and method for flooded workshop | |
| CN203216840U (en) | Ultrasonic remote detection device for cracks on high-voltage insulation ceramic bottle of power transmission line | |
| CN114279607B (en) | Cable joint interface pressure monitoring method and device based on acoustic elastic effect | |
| CN113608156A (en) | False alarm investigation system and judgment method of GIS ultrahigh frequency partial discharge online monitoring device | |
| CN216524441U (en) | MOA internal temperature monitoring device based on array type optical fiber sensor | |
| CN212198016U (en) | Elevator steel cable flaw detection system and elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210720 |
|
| WD01 | Invention patent application deemed withdrawn after publication |