CN113432762B - Method for detecting contact pressing force of isolating switch - Google Patents
Method for detecting contact pressing force of isolating switch Download PDFInfo
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- CN113432762B CN113432762B CN202110703203.7A CN202110703203A CN113432762B CN 113432762 B CN113432762 B CN 113432762B CN 202110703203 A CN202110703203 A CN 202110703203A CN 113432762 B CN113432762 B CN 113432762B
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- contact
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- pressure
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 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
- 230000008859 change Effects 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000011900 installation process Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 2
- 239000002048 multi walled nanotube 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
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Push-Button Switches (AREA)
- Force Measurement Appropriate To Specific Purposes (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 firstly, when the contact of the isolating switch is installed, at least two sensors are arranged at the conductive contact part on a fixed contact, the electrode joint of each sensor is exposed out and connected with a detecting device, and secondly, a moving contact is installed, so that the sensors are tightly clamped at the contact position after closing; and step three, switching on, connecting a detection device, and adjusting the contact if the compression force value is within the qualified interval and the compression force is not qualified, so that the device is ensured to display that the compression force is within the qualified interval. The invention is tightly 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 and measure whether the isolating switch is qualified, thereby effectively preventing the switch failure accident caused by heating.
Description
Technical Field
The invention belongs to the field of transformer overhaul, and relates to an isolating switch, in particular to a method for detecting the contact pressing force of an isolating switch.
Background
The failure accident of the operation isolating switch occurs, particularly the contact part of the contact generates heat at high temperature, the safe and stable operation of the power grid is destroyed, and the main reasons of the disconnection fault are mostly heating faults and the main reasons of the heating are mostly insufficient contact pressing force through operation experience analysis.
At present, the main means for preventing the contact of the isolating switch from heating is an infrared temperature measurement test after a period of operation, but the test can be performed only after a period of operation and cannot be quantified, so that the problem can not be found accurately and timely. There is an urgent need for a method that can accurately and rapidly measure contact pressing force during an installation and debugging stage.
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, which can monitor the magnitude of the pressing force in real time when a moving contact is installed, is used for adjusting the installation process, measuring whether the installation process is qualified or not and preventing the switch failure accident caused by heating.
The technical scheme adopted for solving the technical problems is as follows:
a method for detecting the contact pressing force of isolating switch includes such steps as installing at least two sensors on the static contact, exposing the electrode terminals of sensors to be connected with detector,
step two, installing a moving contact to ensure that the sensor is tightly clamped at a contact position after closing;
and step three, switching on, connecting a detection device, and adjusting the contact if the compression force value is within the qualified interval and the compression force is not qualified, so that the device is ensured to display that the compression force is within 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 collecting and processing data;
the display module displays the measured compression force value;
the power supply 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.
The sensor (4) is a PVDF piezoelectric film.
Moreover, the basic function formula of the pressing force and the relative capacitance variation is as follows:
wherein F is pressure, S is actual measurement sensitivity, and the actual verification proves that the pressure is 1.54Mpa under large pressure -1 K is a coefficient related to the voltage, and the numerical values are shown in the 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 |
When whether the pressing force is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure value F does not accord with the standard range interval, the pressure value F is unqualified.
The invention has the advantages and positive effects that:
the invention is tightly 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 and measure whether the isolating switch is qualified, thereby effectively preventing the switch failure accident caused by heating.
Drawings
FIG. 1 is a schematic view of the mounting location of the sensor of the present invention;
FIG. 2 is a circuit block diagram of the detection device of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
When the isolating switch contact is installed, at least two sensors 4 are arranged at the conductive contact part of the fixed contact 2, and the electrode joint is exposed; the movable contact 1 is installed, so that the sensor 4 is tightly clamped at the contact position after closing; and closing, connecting the detection device 3, and adjusting the contact if the compaction force value is within the qualified interval and the compaction force is not qualified, so as to ensure that the device displays that the compaction force is within the qualified interval. The mounting position of the sensor 4 is shown in fig. 1.
The detection device disclosed by the invention is shown in fig. 2, and comprises a signal conditioning module, a processor module, a display module and a power module, wherein the power module supplies power for each module and is a lithium battery, and the battery capacity can ensure the operation requirement of the system for one month. The signal conditioning module can amplify and convert the electric signal generated by the sensor into a digital signal, then transmit the digital signal to the processor module for processing, and finally output the digital signal through the display module to detect the pressure born by the sensor in real time. The model that the processor module adopted is CHENGTEC MCSB 201, and the model that signal conditioning module adopted is CHENGTEC single channel signal conditioning module.
The sensor adopts PVDF piezoelectric film, the size is 3cm x 3cm, and the thickness is 0.5mm. Preferably, the capacitor pressure sensor has high precision, and the structure is more convenient for distributed pressure measurement, so that the addressing route is 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), and has the characteristics of printing, ultrasensitive property, oxidation resistance, high conductivity and the like while the conductivity and the stability of the sensor electrode material are kept. The flexible substrate of the sensor adopts polyvinylidene fluoride (PVDF) according to a sensitivity formula
Wherein C is 0 For initial capacitance S P For pressure sensitivity, A is the distance between the plates, ε 0 For vacuum dielectric constant, ε r Is the dielectric constant of the piezoelectric element, d 0 Is the piezoelectric material thickness, E is Young's modulus, and p is pressure.
It can be derived that by increasing the dielectric constant epsilon of the dielectric layer r The initial capacitance C0 is increased and a material with a smaller young's modulus is selected to improve the pressure sensitivity of the capacitive pressure sensor. The pressure sensitivity of the sensor can be greatly improved by using the flexible material PVDF as the base material.
Functionally, the piezoelectric sensor may be equivalent to an electrostatic charge generator, and the piezoelectric element itself may be equivalent to a capacitor in the process. In terms of performance, the piezoelectric sensor can be equivalently an active capacitor with a capacitance of
ε 0 For vacuum dielectric constant, ε r The dielectric constant of the piezoelectric element, S is the pressure receiving area, and h is the thickness of the piezoelectric material.
The invention solves the difficulty in designing a sensor suitable for isolating switch contacts and forming a functional relation between stress values of contact pressing forces of different types and sensor electric signals.
To qualitatively analyze the sensor response to pressure, a relative capacitance change is introduced thereinThe relative capacitance is a widely accepted parameter, and can more accurately reflect the relative pressure of the sensorWherein C is a variation of 0 Is the initial capacitance of the sensor, and ΔC is the change in capacitance of the sensor under external pressure. The capacitance change is related to the working pressure in a substantially positive proportion under high pressure, so that the basic function formula for actually calculating the pressure according to the relative capacitance change is:
wherein F is pressure, S is actual measurement sensitivity, and the actual verification proves that the pressure is about 1.54Mpa under large pressure -1 K is a coefficient related to the voltage, and the numerical values are shown in the 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 |
When whether the pressing force is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure value F does not accord with the standard range interval, the pressure value F is unqualified.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that variations and modifications can be made without departing from the scope of the invention.
Claims (3)
1. A method for detecting the 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 at the conductive contact part of the fixed contact (2), the electrode joint of the sensor (4) is exposed and connected with the detection device,
step two, installing a moving contact (1) to ensure that the sensor (4) is tightly clamped at a contact position after closing;
step three, switching on, connecting a detection device (3), and observing whether the compression force value is within a qualified interval, and adjusting the contact if the compression force is not qualified, so as to ensure that the device displays that the compression force is within the qualified interval;
the basic function formula of the pressing force and the relative capacitance change is as follows:
wherein F is pressure, S is actual measurement sensitivity, and the actual verification proves that the pressure is 1.54Mpa under large pressure -1 ，C 0 The initial capacitance of the sensor, delta C is the change value of the capacitance of the sensor under external pressure, K is a coefficient related to the voltage, and the values are shown in the table:
When whether the pressing force is qualified or not is evaluated, a pressure value is obtained according to the capacitance variation, and if the pressure value F does not accord with the standard range interval, the pressure value F is unqualified.
2. The method for detecting the pressing force of the disconnecting switch contact 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 collecting and processing data;
the display module displays the measured compression force value;
the power supply 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 disconnecting switch contact according to claim 1, wherein: the sensor (4) is a PVDF piezoelectric film.
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 |
Applications Claiming Priority (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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| CN113432762A CN113432762A (en) | 2021-09-24 |
| CN113432762B true CN113432762B (en) | 2023-09-29 |
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Citations (9)
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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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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017122178A1 (en) * | 2016-01-14 | 2017-07-20 | King Abdullah University Of Science And Technology | Paper based electronics platform |
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2021
- 2021-06-24 CN CN202110703203.7A patent/CN113432762B/en active Active
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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 |
| 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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