CN113410797B - Strain clamp crimping monitoring method - Google Patents
Strain clamp crimping monitoring method Download PDFInfo
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- CN113410797B CN113410797B CN202110703604.2A CN202110703604A CN113410797B CN 113410797 B CN113410797 B CN 113410797B CN 202110703604 A CN202110703604 A CN 202110703604A CN 113410797 B CN113410797 B CN 113410797B
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- pressure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention relates to a strain clamp crimping monitoring method, which comprises the following steps that firstly, before hydraulic crimping, at least two sensors are arranged in a gap between a clamp and a steel anchor and a gap between the clamp and a lead, and the position with teeth on the steel anchor is avoided; secondly, carrying out compression joint, wherein the sensor is tightly compressed at a compression joint position, and the electrode joint is exposed; connecting a monitoring device, and observing whether the pressure value is in a qualified interval; step four, the monitoring device can detect the pressure value 24 hours after the crimping qualified wire clamp is installed, and if the pressure value meets sudden change, the monitoring device can give an alarm to a background to remind operation and maintenance personnel to overhaul in time and prevent the occurrence of a wire breakage accident. The sensor is arranged in the crimping gap during crimping operation, the pressing force of the crimping position can be monitored in real time to judge whether the crimping process is qualified, meanwhile, the wire clamp state can be monitored in real time for a long time during the completion of wire erection and the operation and maintenance of a circuit, the chronic damage of the wire clamp caused by emergent conditions such as strong wind, ice coating, earthquake and the like can be found in time, and the wire breakage accident can be prevented.
Description
Technical Field
The invention belongs to the field of power transmission engineering, relates to a strain clamp crimping technology, and particularly relates to a strain clamp crimping monitoring method.
Background
With the rapid development of electric power construction and the continuous increase of transmission lines, when the disconnection fault of an overhead transmission line occurs, the safe and stable operation of a power grid is damaged, and particularly for a three-span line crossing a high-speed railway, a highway and an important transmission channel, once the disconnection fault occurs, economic loss and social influence and serious influence are caused. Through operation experience analysis, the main reasons of the wire breakage fault are that the crimping quality of the strain clamp of the lead wire and the strain clamp of the ground wire is unqualified. At present, the method for detecting the crimping quality of the strain clamp and the splicing sleeve mainly comprises appearance size detection, grip strength test and X-ray detection after crimping. The appearance size detection cannot reflect the internal crimping state of the strain clamp; the grip strength test is a destructive test, only the quality of the same batch of products before installation is pre-judged, and the quality of all untested and in-transit strain clamps cannot be accurately determined; the X-ray detection is used as a nondestructive detection method, has the advantages of visual and accurate detection, no damage to wires and fittings and the like, but has the disadvantages of complex test system, heavy equipment, inconvenient operation on a tower and radiation damage to detection personnel. Aiming at the supervision blind area of the crimping quality of hardware fittings in a construction field, a novel nondestructive testing method for the crimping quality of the strain clamp is urgently needed to be researched.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a strain clamp crimping monitoring method which can quantify the crimping quality, give an alarm in time when insufficient pressure is caused by an emergency, and prevent the occurrence of a wire breakage accident.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a strain clamp crimping monitoring method comprises the following steps:
firstly, before hydraulic pressure welding, at least two sensors are arranged in a gap between a wire clamp and a steel anchor and a gap between the wire clamp and a lead, and the position with teeth on the steel anchor is avoided;
secondly, carrying out compression joint, wherein the sensor is tightly compressed at a compression joint position, and the electrode joint is exposed;
thirdly, connecting a monitoring device, and observing whether the pressure value is in a qualified interval;
step four, the monitoring device can detect the pressure value 24 hours after the crimping qualified wire clamp is installed, and if the pressure value meets sudden change, the monitoring device can give an alarm to a background to remind operation and maintenance personnel to overhaul in time and prevent the occurrence of a wire breakage accident.
Moreover, the monitoring device includes:
the device comprises a signal conditioning module, a signal processing module and a signal processing module, wherein the signal processing module is used for amplifying an electric signal generated by a sensor and converting the amplified electric signal into a digital signal;
the processor module is used for data acquisition and processing;
the communication module is used for transmitting data to the terminal, and the terminal can monitor the pressure applied to the sensor in real time after receiving the data;
and the power supply module adopts solar energy for power supply.
Moreover, the sensor is a PVDF piezoelectric film.
Furthermore, the pressure and relative capacitance change are expressed as a basic function:
wherein F is pressure, S is actually measured sensitivity, and is about under the atmospheric pressure through practical verification1.33Mpa -1 K is the coefficient related to the material of the wire clamp and the voltage, and the numerical value is as shown in the table:
| 800-1250mm 2 | 720mm 2 | 630mm 2 | 400mm 2 | 300mm 2 | 240mm 2 | 210/220mm 2 | |
| aluminium alloy | 1.23 | 1.18 | 1.11 | 1.00 | 0.95 | 0.89 | 0.80 |
| Steel | 1.14 | 1.09 | 1.03 | 0.94 | 0.87 | 0.76 | 0.70 |
When whether the crimping is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure F value is 0, the pressure leakage is determined; if the pressure F value is smaller than the standard range but not 0, the pressure is under-pressure; if the pressure value is larger than the standard range, the pressure is over-pressure, and the three types of pressure are unqualified pressure welding.
The invention has the advantages and positive effects that:
the sensor is arranged in the crimping gap during crimping operation, the pressing force of the crimping part can be monitored in real time to measure whether the crimping process is qualified, and meanwhile, the wire clamp state can be monitored in real time for a long time during the completion of wire erection and the operation and maintenance of a circuit, so that the chronic damage of the wire clamp caused by sudden conditions such as strong wind, ice coating, earthquakes and the like can be found in time, and the wire breakage accident can be prevented.
Drawings
FIG. 1 is a schematic view of the installation position of the sensor of the present invention on a strain clamp;
wherein: 1 is a sensor, 2 is a monitoring device
Fig. 2 is a circuit block diagram of the monitoring device of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A strain clamp crimping monitoring method comprises the following steps:
firstly, before hydraulic pressure crimping, at least two sensors 1 are arranged in a gap between a wire clamp and a steel anchor and a gap between the wire clamp and a lead, the position with teeth on the steel anchor is avoided, and the piezoelectric film is prevented from being damaged by overlarge shearing force during crimping;
secondly, performing compression joint, wherein the sensor is tightly compressed at a compression joint position, and the electrode joint is exposed;
and step three, connecting the monitoring device 2, observing whether the pressure value is in a qualified interval, wherein the overvoltage and the undervoltage do not meet the requirement, breaking the wire clamp with unqualified crimping and re-crimping, and the sensor can be repeatedly used.
Step four, the monitoring device can detect the pressure value 24 hours after the crimping qualified wire clamp is installed, and if the pressure value meets sudden change, the monitoring device can give an alarm to a background to remind operation and maintenance personnel to overhaul in time and prevent the occurrence of a wire breakage accident.
The mounting position of the sensor 1 is shown in fig. 1.
The monitoring device comprises a signal conditioning module, a processor module, a communication module and a power supply module, wherein the power supply module supplies power to each module and comprises a small solar panel, a lithium battery and a charging system, and the battery capacity can meet the operating requirement of the system in one month. The signal conditioning module can amplify the electric signals generated by the sensor and then convert the electric signals into digital signals, the digital signals are transmitted to the processor module to be processed, the final data are sent through the communication module, and the pressure on the sensor can be detected in real time after the data are received by the terminal. The processor module is of a CHENGTCMCCUSB 201 model, the signal conditioning module is of a CHENGTEC single-channel signal conditioning module model, and the communication module is of a loraLG206-L-P model.
The sensor adopts PVDF piezoelectric film, and the size is 3cm 3cm, and thickness is 0.5mm. The capacitor pressure sensor is preferably selected, the capacitor pressure sensor is high in precision, meanwhile, the structure is more convenient for distributed pressure measurement, addressing routes are reduced to a great extent, and the capacitor pressure sensor is more convenient. The sensor electrode material is prepared by adding polystyrene sulfonate (PEDOT: PSS) into multi-walled carbon nanotubes (MCNTs), so that the conductivity and stability of the sensor electrode material are maintained, and the flexibility is obviously improved, and the sensor electrode material has the characteristics of printing, ultrasensitiveness, oxidation resistance, high conductivity and the like. The flexible substrate of the sensor adopts polyvinylidene fluoride (PVDF) according to a sensitivity formula
C 0 Is an initial capacitance, S P For pressure sensitivity, A is the interplate distance, ε 0 Is a vacuum dielectric constant of ∈ r Is the dielectric constant of the piezoelectric element, d 0 E is the Young's modulus and p is the pressure.
It can be found that the dielectric constant ε can be improved by increasing the dielectric layer r The initial capacitance C0 is increased and the pressure sensitivity of the capacitance type pressure sensor is improved by selecting a material with a smaller Young modulus E. The pressure sensitivity of the sensor can be greatly improved by selecting flexible material PVDF as the substrate material.
Functionally, a piezoelectric sensor may be equivalent to a static charge generator, while a piezoelectric element itself may be equivalent to a capacitor in this process. In terms of performance, the piezoelectric sensor can be equivalent to an active capacitor with a capacitance C a Is composed of
ε 0 Is a vacuum dielectric constant of ∈ r Is the dielectric constant of the piezoelectric element, S is the pressed area, and h is the thickness of the piezoelectric material.
The invention solves the difficulty that a sensor suitable for crimping of strain clamps is designed, and the stress values of different types of strain clamps after crimping and the electric signals of the sensor form a functional relation.
In order to qualitatively analyze the response of the sensor to pressure, a relative capacitance change is introduced
Relative capacitance is a widely recognized parameter that more accurately reflects changes in relative pressure of the sensor, where C 0 Is the initial capacitance of the sensor, and Δ C is the change in capacitance of the sensor under an external force. And the rated working pressure of the hydraulic pressure welding machine is not less than 63Mpa when the hydraulic pressure welding machine is in pressure welding according to DL/T5285-2013 & ltHydraulic pressure welding process regulations for overhead conductors and ground wires in power transmission and transformation engineering & gt.The capacitance variation under high pressure is substantially proportional to the operating pressure, so the fundamental function equation for actually finding pressure from the relative capacitance variation is:
wherein F is pressure, S is actually measured sensitivity, and the actual verification shows that the pressure is about 1.33Mpa under large pressure -1 K is the coefficient relevant with fastener material, voltage size, and numerical value is as shown in the table:
| 800-1250mm 2 | 720mm 2 | 630mm 2 | 400mm 2 | 300mm 2 | 240mm 2 | 210/220mm 2 | |
| aluminium alloy | 1.23 | 1.18 | 1.11 | 1.00 | 0.95 | 0.89 | 0.80 |
| Steel | 1.14 | 1.09 | 1.03 | 0.94 | 0.87 | 0.76 | 0.70 |
When whether the crimping is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure F value is 0, the pressure leakage is determined; if the pressure F value is smaller than the standard range but not 0, the pressure is under-pressure; if the pressure value is larger than the standard range, the pressure is over-pressure, and the three types of pressure are unqualified pressure welding.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (3)
1. A strain clamp crimping monitoring method comprises the following steps:
firstly, before hydraulic pressure welding, at least two sensors are arranged in a gap between a wire clamp and a steel anchor and a gap between the wire clamp and a lead, and the position with teeth on the steel anchor is avoided;
secondly, carrying out compression joint, wherein the sensor is tightly compressed at a compression joint position, and the electrode joint is exposed;
thirdly, connecting a monitoring device, and observing whether the pressure value is in a qualified interval;
step four, detecting a pressure value by a monitoring device 24 hours after the wire clamp which is qualified in crimping is installed, and alarming by a background if sudden change occurs, reminding operation and maintenance personnel to overhaul in time, and preventing the occurrence of a wire breakage accident;
the basic function formula of the pressing force and the relative capacitance variation is as follows:
wherein F is pressure, C 0 Is the initial capacitance of the sensor, delta C is the change value of the capacitance of the sensor under external pressure, S is the actually measured sensitivity, and the actual verification shows that the capacitance is 1.33Mpa under large pressure -1 K is the coefficient relevant with fastener material, voltage size, and numerical value is as shown in the table:
When whether the crimping is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure value F is 0, the pressure is determined to be leakage; if the pressure value F is smaller than the standard range but not 0, the pressure value is under-pressure; if the pressure value is larger than the standard range, the pressure is over-pressure, and the three types of pressure are unqualified pressure welding.
2. The strain clamp crimping monitoring method of claim 1, characterized in that: the monitoring device comprises:
the device comprises a signal conditioning module, a signal processing module and a signal processing module, wherein the signal processing module is used for amplifying an electric signal generated by a sensor and converting the amplified electric signal into a digital signal;
the processor module collects and processes data;
the communication module is used for transmitting data to the terminal, and the terminal can monitor the pressure applied to the sensor in real time after receiving the data;
and the power supply module adopts solar energy for power supply.
3. The strain clamp crimping monitoring method of claim 1, characterized in that: the sensor is a PVDF piezoelectric film.
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| CN202110703604.2A CN113410797B (en) | 2021-06-24 | 2021-06-24 | Strain clamp crimping monitoring method |
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| CN113410797B true CN113410797B (en) | 2023-03-28 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102007050176A1 (en) * | 2007-10-19 | 2009-04-23 | Tyco Electronics Amp Gmbh | Mobile device i.e. hand pliers, for crimping electrical wire to crimp-contact element of electrical connector, has measuring device measuring crimping force exerted on crimp-contact element during working stroke |
| CN106655061B (en) * | 2016-11-16 | 2024-02-06 | 国家电网公司 | Intelligent strain clamp of overhead ground wire |
| CN108631245A (en) * | 2017-03-16 | 2018-10-09 | 徐州宇飞电力科技有限公司 | A kind of power transmission line intelligent thermometric strain clamp |
| CN208062889U (en) * | 2018-03-30 | 2018-11-06 | 国网浙江省电力有限公司电力科学研究院 | High pressure wire clamp intelligent radio monitors system |
| CN207967875U (en) * | 2018-03-30 | 2018-10-12 | 山东华拓电气技术有限公司 | Safety backup for monitoring transmission line of electricity protects line clamping device |
| CN112505153B (en) * | 2020-08-25 | 2023-06-20 | 广西电网有限责任公司电力科学研究院 | Technical feasibility analysis method and system for strain clamp crimping quality inspection |
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