CN113432762A - Method for detecting pressing force of contact of isolating switch - Google Patents
Method for detecting pressing force of contact of isolating switch Download PDFInfo
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- CN113432762A CN113432762A CN202110703203.7A CN202110703203A CN113432762A CN 113432762 A CN113432762 A CN 113432762A CN 202110703203 A CN202110703203 A CN 202110703203A CN 113432762 A CN113432762 A CN 113432762A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 230000003750 conditioning effect Effects 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 claims description 7
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000011900 installation process Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002048 multi walled nanotube Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000144 PEDOT:PSS Polymers 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Push-Button Switches (AREA)
Abstract
The invention relates to a method for detecting the pressing force of a contact of an isolating switch, which comprises the following steps that when the contact of the isolating switch is installed, at least two sensors are arranged on a conductive contact part on a static contact, an electrode joint of the sensor is exposed and connected with a detection device, and a moving contact is installed to ensure that the sensor is tightly clamped at a contact position after switching on; and step three, switching on, connecting a detection device, observing whether the pressing force value is between the qualified interval and adjusting a contact if the pressing force value is not qualified, and ensuring that the device displays that the pressing force is in the qualified interval. The invention is closely attached to the contact surface of the static contact when the isolating switch is installed, and can monitor the pressing force in real time when the moving contact is installed, so as to adjust the installation process, measure whether the isolating switch is qualified or not, and effectively prevent the switch failure accident caused by heating.
Description
Technical Field
The invention belongs to the field of transformer maintenance, relates to an isolating switch, and particularly relates to a method for detecting contact pressing force of the isolating switch.
Background
The fault accident of the isolating switch occurs frequently, particularly the contact part of the contact generates heat at high temperature to damage the safe and stable operation of the power grid, and through the analysis of operation experience, the main reason of the broken line fault is mostly heating fault, and the main reason of the heating is mostly insufficient contact pressing force.
At present, the main means for preventing the contact of the disconnecting switch from heating is an infrared temperature measurement test after a period of operation, but the test can be carried out only after a period of operation and cannot be quantified, and the problem cannot be accurately and timely found. A method for accurately and rapidly measuring the contact pressure force in the installation and debugging stage is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting the pressing force of a contact of an isolating switch.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for detecting the pressing force of contact of isolating switch includes such steps as installing the contacts of isolating switch, arranging at least two sensors at the electrically conducting contact position on static contact, exposing the electrode terminals of sensors, connecting them to detector,
secondly, installing a moving contact to ensure that the sensor is tightly clamped at a contact position after switching on;
and step three, switching on, connecting a detection device, observing whether the pressing force value is between the qualified interval and adjusting a contact if the pressing force value is not qualified, and ensuring that the device displays that the pressing force is in the qualified interval.
Moreover, the detection device includes:
the signal conditioning module amplifies the electric signal generated by the sensor and converts the amplified electric signal into a digital signal;
the processor module is used for acquiring and processing data;
the display module is used for displaying the actually measured compaction force value;
the power module supplies power to each module;
the sensor (4) is connected with the signal conditioning module, the signal conditioning module is connected with the processor module, and the processor module is connected with the display module.
Moreover, the sensor (4) is a PVDF piezoelectric film.
Furthermore, the basic function formula of the pressing force and the relative capacitance variation is as follows:
wherein F is pressure, S is actually measured sensitivity, and the actual verification shows that the pressure is 1.54Mpa under large pressure-1K is a coefficient related to the voltage, and the numerical value is shown as the following table:
| 10kV | 35kV | 66kV | 110kV | 220kV | 500kV | 800kV/1000kV | |
| k value | 1.20 | 1.15 | 1.11 | 1.00 | 0.96 | 0.90 | 0.85 |
And when the pressing force is evaluated to be qualified, solving the pressure value according to the capacitance variation, and if the pressure value F is not in accordance with the standard range interval, determining that the pressing force is unqualified.
The invention has the advantages and positive effects that:
the invention is closely attached to the contact surface of the static contact when the isolating switch is installed, and can monitor the pressing force in real time when the moving contact is installed, so as to adjust the installation process, measure whether the isolating switch is qualified or not, and effectively prevent the switch failure accident caused by heating.
Drawings
FIG. 1 is a schematic view of the installation location of the sensor of the present invention;
FIG. 2 is a block diagram of the detecting 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 method for detecting pressing force of an isolating switch contact is characterized in that when the isolating switch contact is installed, at least two sensors 4 are placed on a conductive contact part on a static contact 2, and an electrode joint is exposed; the moving contact 1 is installed to ensure that the sensor 4 is tightly clamped at a contact position after switching on; and switching on, connecting the detection device 3, observing whether the pressing force value is between the qualified interval and adjusting the contact if the pressing force is not qualified, and ensuring that the device displays that the pressing force is in the qualified interval. The mounting position of the sensor 4 is shown in fig. 1.
The detection device comprises a signal conditioning module, a processor module, a display module and a power supply module, wherein the power supply module supplies power to each module and is a lithium battery, and the battery capacity can meet the operation requirement of a system for one month. The signal conditioning module can amplify the electric signal generated by the sensor and then convert the electric signal into a digital signal, the digital signal is transmitted to the processor module to be processed, and finally the digital signal is output through the display module to detect the pressure applied to the sensor in real time. The processor module adopts a CHENGTEC MCCUSB201 model, and the signal conditioning module adopts a CHENGTEC single-channel signal conditioning module model.
The sensor adopts a PVDF piezoelectric film, the size is 3cm by 3cm, and the thickness is 0.5 mm. 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
Wherein, C0Is an initial capacitance, SPFor pressure sensitivity, A is the interplate distance, ε0Is a vacuum dielectric constant of ∈rIs the dielectric constant of the piezoelectric element, d0E 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 layerrThe initial capacitance C0 is increased and the pressure sensitivity of the capacitance type pressure sensor is improved by selecting a material with smaller Young modulus. 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 having a capacitance of
ε0Is a vacuum dielectric constant of ∈rIs 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 an isolating switch contact is designed, and the stress values of the pressing force of contacts of different types and the electric signal of the sensor form a functional relation.
In order to qualitatively analyze the response of the sensor to pressure, this is doneRelative capacitance change is introduced into
Relative capacitance is a widely recognized parameter that more accurately reflects changes in relative pressure of the sensor, where C0Is the initial capacitance of the sensor, and Δ C is the change in capacitance of the sensor under an external force. 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 1.54Mpa under the atmospheric pressure-1K is a coefficient related to the voltage, and the numerical value is shown as the following table:
| 10kV | 35kV | 66kV | 110kV | 220kV | 500kV | 800kV/1000kV | |
| k value | 1.20 | 1.15 | 1.11 | 1.00 | 0.96 | 0.90 | 0.85 |
And when the pressing force is evaluated to be qualified, solving the pressure value according to the capacitance variation, and if the pressure value F is not in accordance with the standard range interval, determining that the pressing force is unqualified.
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 (4)
1. A method for detecting contact pressing force of an isolating switch is characterized by comprising the following steps:
firstly, when the isolating switch contact is installed, at least two sensors (4) are arranged on the conductive contact part of the static contact (2), the electrode joints of the sensors (4) are exposed and connected with a detection device,
secondly, installing a moving contact (1) to ensure that a sensor (4) is tightly clamped at a contact position after closing;
and step three, switching on, connecting a detection device (3), observing whether the pressing force value is between the qualified interval and adjusting a contact if the pressing force is not qualified, and ensuring that the device displays that the pressing force is in the qualified interval.
2. The method for detecting the pressing force of the contact of the disconnecting switch according to claim 1, wherein: the detection device (3) comprises:
the signal conditioning module amplifies the electric signal generated by the sensor and converts the amplified electric signal into a digital signal;
the processor module is used for acquiring and processing data;
the display module is used for displaying the actually measured compaction force value;
the power module supplies power to each module;
the sensor (4) is connected with the signal conditioning module, the signal conditioning module is connected with the processor module, and the processor module is connected with the display module.
3. The method for detecting the pressing force of the contact of the disconnecting switch according to claim 1, wherein: the sensor (4) is a PVDF piezoelectric film.
4. The method for detecting the pressing force of the contact of the disconnecting switch according to claim 1, wherein: the basic function formula of the pressing force and the relative capacitance variation is as follows:
wherein F is pressure, S is actually measured sensitivity, and the actual verification shows that the pressure is 1.54Mpa under large pressure-1K is a coefficient related to the voltage, and the numerical value is shown as the following table:
And when the pressing force is evaluated to be qualified, solving the pressure value according to the capacitance variation, and if the pressure value F is not in accordance with the standard range interval, determining that the pressing force is unqualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110703203.7A CN113432762B (en) | 2021-06-24 | 2021-06-24 | Method for detecting contact pressing force of isolating switch |
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| CN202110703203.7A CN113432762B (en) | 2021-06-24 | 2021-06-24 | Method for detecting contact pressing force of isolating switch |
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| CN113432762A true CN113432762A (en) | 2021-09-24 |
| CN113432762B CN113432762B (en) | 2023-09-29 |
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Citations (10)
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|---|---|---|---|---|
| JP2006200980A (en) * | 2005-01-19 | 2006-08-03 | Alps Electric Co Ltd | Capacitance type pressure sensor and capacitance type actuator |
| CN101231199A (en) * | 2008-02-25 | 2008-07-30 | 四川电力试验研究院 | Outdoor high-voltage isolating switch sensing finger pressure tester |
| CN102589768A (en) * | 2012-03-01 | 2012-07-18 | 昆明理工大学 | Method for measuring disconnecting switch contact finger pressure based on optical fiber Bragg grating sensor |
| CN103604544A (en) * | 2013-11-30 | 2014-02-26 | 河北工业大学 | Device and method for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
| CN104677502A (en) * | 2015-02-11 | 2015-06-03 | 国家电网公司 | Infrared remote wired alarm device for high-voltage isolation switch heat fault and operation method |
| CN106384739A (en) * | 2016-08-29 | 2017-02-08 | 上海天马微电子有限公司 | Organic light-emitting display panel, driving method thereof and organic light-emitting display device |
| CN205940834U (en) * | 2016-06-30 | 2017-02-08 | 国家电网公司 | A device for measuring isolator packing force |
| KR20170020837A (en) * | 2017-02-16 | 2017-02-24 | 주식회사 하이딥 | Sensitivity compensation method of touch input device being capable of touch pressure sensing and computer readable recording medium |
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| US20190011288A1 (en) * | 2016-01-14 | 2019-01-10 | King Abdullah University Of Science And Technology | Paper based electronics platform |
-
2021
- 2021-06-24 CN CN202110703203.7A patent/CN113432762B/en active Active
Patent Citations (10)
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|---|---|---|---|---|
| JP2006200980A (en) * | 2005-01-19 | 2006-08-03 | Alps Electric Co Ltd | Capacitance type pressure sensor and capacitance type actuator |
| CN101231199A (en) * | 2008-02-25 | 2008-07-30 | 四川电力试验研究院 | Outdoor high-voltage isolating switch sensing finger pressure tester |
| CN102589768A (en) * | 2012-03-01 | 2012-07-18 | 昆明理工大学 | Method for measuring disconnecting switch contact finger pressure based on optical fiber Bragg grating sensor |
| CN103604544A (en) * | 2013-11-30 | 2014-02-26 | 河北工业大学 | Device and method for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
| CN104677502A (en) * | 2015-02-11 | 2015-06-03 | 国家电网公司 | Infrared remote wired alarm device for high-voltage isolation switch heat fault and operation method |
| US20190011288A1 (en) * | 2016-01-14 | 2019-01-10 | King Abdullah University Of Science And Technology | Paper based electronics platform |
| CN205940834U (en) * | 2016-06-30 | 2017-02-08 | 国家电网公司 | A device for measuring isolator packing force |
| CN106384739A (en) * | 2016-08-29 | 2017-02-08 | 上海天马微电子有限公司 | Organic light-emitting display panel, driving method thereof and organic light-emitting display device |
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