CN112345405A - Sulfur hexafluoride gas density monitoring device and method - Google Patents
Sulfur hexafluoride gas density monitoring device and method Download PDFInfo
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- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
- G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork
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Abstract
The sulfur hexafluoride gas density monitoring device and the method provided by the embodiment of the invention utilize the sinusoidal signal vibration of the tuning fork type quartz crystal oscillator at different frequencies to generate a current signal, the current signal is sent out through the preamplifier, the phase-locked amplifier and the wireless data sending module, and then the linear reaction of the quality factor Q value of the tuning fork type quartz crystal oscillator at different sulfur hexafluoride gas densities is utilized to monitor the sulfur hexafluoride gas leakage in the electrical equipment in real time. The sulfur hexafluoride gas density monitoring method provided by the invention uses the sulfur hexafluoride gas density monitoring device, so that the sulfur hexafluoride gas density monitoring device and the sulfur hexafluoride gas density monitoring method provided by the embodiment of the invention can save manual meter reading, save cost, improve safety coefficient and improve detection capability of potential insulation faults.
Description
Technical Field
The invention belongs to the technical field of gas density monitoring, and particularly relates to a sulfur hexafluoride gas density monitoring device and method.
Background
In high voltage power systems, sulfur hexafluoride (SF)6) The gas has outstanding gas insulation performance and arc extinguishing capability, and is often introduced into electrical equipment such as Gas Insulated Switchgear (GIS) as an insulating medium, SF6The purity and density of the gas determine the insulation and arc extinguishing capability of equipment such as GIS and the like. But at high pressureDuring operation of the electrical apparatus, SF6Leakage of gas is a common equipment defect with significant safety hazards, SF6The leakage of gas can cause the internal insulation strength of the equipment to be reduced, and cause unplanned power failure and even major safety accidents. In addition, due to SF6The greenhouse effect of a gas is carbon dioxide (CO)2) Twenty thousand times of gas, SF6The leakage of the SF can generate a large greenhouse effect and pollute the atmospheric environment, so that the SF in the equipment needs to be periodically and multipoint inspected in the power system6The density of the gas.
At present, mechanical temperature compensation SF is generally installed in GIS and other equipment in a transformer substation6The method needs manual meter reading, so that the defects of reading error and the like exist, and SF in the equipment cannot be detected6The gas pressure is monitored in real time for a long period of time. Furthermore, the SF needs to be periodically checked6Density relay verification to eliminate potential safety hazards, and SF6The connection mode between the density relay and the electrical equipment body meets the requirement that the density relay is not disassembled and checked, so that the inspection work of the density relay can be only carried out on site. Because the distance between the installation points of the GIS and other equipment is higher than the ground, the height of the GIS needs to be raised when the GIS is manually and periodically checked and observed, and potential safety hazards exist. In addition, the heavy SF is required to be carried when the gas density meter is checked6Standard gas cylinders, SF6The gas density monitoring work is time-consuming and labor-consuming work with certain potential safety hazard, and the monitoring cost is high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a sulfur hexafluoride gas density monitoring device and a sulfur hexafluoride gas density monitoring method. The technical problem to be solved by the invention is realized by the following technical scheme:
in a first aspect, a sulfur hexafluoride gas density monitoring device provided in an embodiment of the present invention includes: the wireless data transmission device comprises a signal generator, a tuning fork type quartz crystal oscillator, a preamplifier, a phase-locked amplifier and a wireless data transmission module, wherein a sinusoidal signal output end of the signal generator is connected with one end of the tuning fork type quartz crystal oscillator, a synchronous signal output end of the signal generator is connected with a synchronous signal input end of the phase-locked amplifier, the other end of the tuning fork type quartz crystal oscillator is connected with a negative input end of the preamplifier, a positive input end of the preamplifier is grounded, an output end of the preamplifier is connected with a signal input end of the phase-locked amplifier, an output end of the phase-locked amplifier is connected with an input end of the wireless data transmission module, and the wireless data transmission module is communicated with external wireless equipment.
And the output end and the negative input end of the preamplifier are connected with a resistor Rg in a crossing mode. The external wireless device includes: the output end of the wireless data receiving module is connected with the input end of the terminal equipment.
In a second aspect, a sulfur hexafluoride gas density monitoring method provided by an embodiment of the present invention is implemented by using the sulfur hexafluoride gas density monitoring apparatus in the first aspect, and the sulfur hexafluoride gas density monitoring method includes:
acquiring data transmitted by a wireless data transmission module;
calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the data;
determining the density of the sulfur hexafluoride gas based on the quality factor Q;
the data is data which is generated by a signal generator according to a preset frequency step length, is a sinusoidal signal from an initial frequency to a final frequency and is transmitted to a tuning fork type quartz crystal oscillator, the tuning fork type quartz crystal oscillator generates mechanical vibration and generates a current signal and transmits the current signal to a preamplifier, the preamplifier amplifies the current signal and outputs a voltage signal to a phase-locked amplifier, the phase-locked amplifier adjusts the voltage signal and outputs data corresponding to the voltage signal to a wireless data transmitting module, and the wireless data transmitting module transmits the data; the data represents the resonance characteristics of a tuning fork quartz crystal oscillator.
Optionally, the generating, by the signal generator, a sinusoidal signal from an initial frequency to a final frequency according to a preset frequency step includes:
the signal generator generates sinusoidal signals from an initial frequency to a termination frequency in an increasing mode according to a preset frequency step, and sinusoidal signals from the initial frequency to the termination frequency are obtained.
Optionally, the tuning fork type quartz crystal oscillator generates mechanical vibration, generates a current signal and transmits the current signal to the preamplifier, and the tuning fork type quartz crystal oscillator includes:
the tuning fork type quartz crystal oscillator generates mechanical vibration, generates a current signal corresponding to the sine signal and transmits the current signal to the preamplifier.
Optionally, the step of calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the data includes:
determining a voltage signal corresponding to the data;
determining a maximum frequency of the voltage signal;
and calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the maximum frequency.
Wherein the maximum frequency is the resonance frequency f of the tuning fork quartz crystal resonating with the sine signal0。
Optionally, the calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the maximum frequency includes:
calculating the quality factor Q of the tuning fork type quartz crystal oscillator by using a quality factor Q calculation formula based on the maximum frequency;
wherein, the quality factor Q calculation formula is as follows:
Q＝f0/Δf
Δ f is the frequency width at which the amplitude of the voltage signal drops by half the maximum value.
Optionally, determining the density of the sulfur hexafluoride gas based on the quality factor Q includes:
calculating the density of the sulfur hexafluoride gas using a linear formula based on the quality factor Q,
wherein, the linear formula is: q12794 m-88, where m is the density of sulfur hexafluoride gas.
The embodiment of the invention provides a sulfur hexafluoride gas density monitoring device and method, which utilize sinusoidal telecommunication at different frequenciesUnder the drive of the signal, the tuning fork type quartz crystal oscillator generates different current signals, the current signals are sent out through the preamplifier, the phase-locked amplifier and the wireless data sending module, and then the Q value of the tuning fork type quartz crystal oscillator is utilized to be in different SF6Monitoring SF in electrical equipment in real time by linear reaction at gas density6The gas leaks. The sulfur hexafluoride gas density monitoring method provided by the invention uses the sulfur hexafluoride gas density monitoring device, so that the sulfur hexafluoride gas density monitoring device and the sulfur hexafluoride gas density monitoring method provided by the embodiment of the invention can save manual meter reading, save cost, improve safety coefficient and improve detection capability of potential insulation faults.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a sulfur hexafluoride gas density monitoring device provided in an embodiment of the present invention;
fig. 2 is a schematic flow chart of a sulfur hexafluoride gas density monitoring method according to an embodiment of the present invention;
FIG. 3 is a frequency response curve of a tuning fork quartz crystal oscillator in pure sulfur hexafluoride gas according to an embodiment of the present invention;
FIG. 4 is a diagram showing a relationship between a quality factor of a tuning fork quartz crystal oscillator and a concentration ratio of sulfur hexafluoride/nitrogen;
fig. 5 is a schematic structural view of a single-point type micro sulfur hexafluoride gas density monitoring device provided in an embodiment of the present invention;
fig. 6 is a schematic structural view of a multi-point type micro sulfur hexafluoride gas density monitoring device provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
First, before describing the device and method for monitoring sulfur hexafluoride gas density provided by the embodiment of the invention, the principle of the invention is described.
The tuning fork type quartz crystal oscillator is made of quartz piezoelectric crystal materialThe manufactured product has the advantages of small volume (8 x 3mm), low price, high quality factor (about 100000 in vacuum), and the like, and the mechanical vibration of the product can be equivalent to an RLC series resonant circuit. The schematic diagram of the test circuit of the frequency response characteristic of the tuning fork type quartz crystal oscillator is shown in FIG. 1. Because the quartz crystal has piezoelectric effect, if an alternating voltage U is applied to one pin of the crystal waferinThe crystal wafer will generate corresponding mechanical vibration, and due to the vibration of the crystal wafer, an alternating electric field will be generated due to the positive piezoelectric effect of the piezoelectric material. Normally, the vibration amplitude of the crystal plate and the voltage of the generated alternating electric field are weak, but when the frequency of the applied voltage is consistent with the free resonance frequency of the tuning fork type quartz crystal oscillator, the vibration amplitude and the voltage of the generated alternating electric field are obviously increased, namely, the piezoelectric resonance effect is generated. In sulfur hexafluoride gas with different densities, the tuning fork type quartz crystal oscillator has different gas vibration damping, and the vibration amplitude of the oscillating arm of the tuning fork type quartz crystal oscillator is different from the generated alternating electric field voltage, so that the density of the sulfur hexafluoride gas can be monitored through the vibration response characteristic of the tuning fork type quartz crystal oscillator.
Example one
With reference to fig. 1 and 5, a sulfur hexafluoride gas density monitoring device provided by an embodiment of the present invention includes: the wireless data transmission device comprises a signal generator, a tuning fork type quartz crystal oscillator, a preamplifier, a phase-locked amplifier and a wireless data transmission module, wherein a sinusoidal signal output end of the signal generator is connected with one end of the tuning fork type quartz crystal oscillator, a synchronous signal output end of the signal generator is connected with a synchronous signal input end of the phase-locked amplifier, the other end of the tuning fork type quartz crystal oscillator is connected with a negative input end of the preamplifier, a positive input end of the preamplifier is grounded, an output end of the preamplifier is connected with a signal input end of the phase-locked amplifier, an output end of the phase-locked amplifier is connected with an input end of the wireless data transmission module, and the wireless data transmission module is communicated with external wireless equipment.
And the output end and the negative input end of the preamplifier are connected with a resistor Rg in a crossing mode.
The embodiment of the invention provides a medicine for treating hepatitis BA sulfur fluoride gas density monitoring device adopts a low-cost and small-volume tuning fork type quartz crystal oscillator as a gas density sensor sensing device, utilizes the tuning fork type quartz crystal oscillator to generate different current signals under the drive of sine electric signals with different frequencies, and sends the current signals through a preamplifier, a phase-locked amplifier and a wireless data sending module, and then utilizes the Q value of the tuning fork type quartz crystal oscillator to realize the SF data transmission at different SF data rates6Monitoring SF in electrical equipment in real time by linear reaction at gas density6The gas leaks. Therefore, the invention has simple structure, small volume and low cost, can be installed at a plurality of positions on the electrical equipment, can save manual meter reading, save cost, improve safety coefficient and improve the detection capability of potential insulation faults.
Wherein the external wireless device comprises: the output end of the wireless data receiving module is connected with the input end of the terminal equipment.
The terminal device may be a mobile phone, a computer, a portable device, and the like.
Taking a computer as an example, the wireless data sending module sends the received SF6The voltage signal is sent to the wireless data receiving module in a wireless mode, and finally the wireless data receiving module can input the received signal to a computer through a USB interface.
Example two
As shown in fig. 2, in the sulfur hexafluoride gas density monitoring method provided in the first embodiment of the present invention, using the sulfur hexafluoride gas density monitoring device in the first embodiment, the sulfur hexafluoride gas density monitoring method includes:
s21, acquiring data sent by the wireless data sending module;
s22, calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the data;
s23, determining the density of the sulfur hexafluoride gas based on the quality factor Q;
the data is data which is generated by a signal generator according to a preset frequency step length, is a sinusoidal signal from an initial frequency to a final frequency and is transmitted to a tuning fork type quartz crystal oscillator, the tuning fork type quartz crystal oscillator generates mechanical vibration and generates a current signal and transmits the current signal to a preamplifier, the preamplifier amplifies the current signal and outputs a voltage signal to a phase-locked amplifier, the phase-locked amplifier adjusts the voltage signal and outputs data corresponding to the voltage signal to a wireless data transmitting module, and the wireless data transmitting module transmits the data; the data represents the resonance characteristics of a tuning fork quartz crystal oscillator.
Wherein, the signal generator generates the sine signal from the initial frequency to the end frequency according to the preset frequency step comprises:
the signal generator generates sinusoidal signals from an initial frequency to a termination frequency in an increasing mode according to a preset frequency step, and sinusoidal signals from the initial frequency to the termination frequency are obtained.
Wherein, the initial frequency is 32700Hz, the termination frequency is 32850Hz, and the frequency step is 0.1 Hz. The signal generator outputs a sine wave signal with a peak value of 300mV, and the sine wave signal is input to one pin of the tuning fork type quartz crystal oscillator to excite the tuning fork arm to generate mechanical vibration. The sine wave signal was DC biased at 2.5V and the frequency was swept from 32700Hz to 32850Hz in 0.1Hz steps with a latency of 0.01s per step. When the frequency sweep of the sine wave is over, the frequency of the sine wave signal returns to 32700Hz again, and the sweep is repeated to 32850Hz with a step of 0.1 Hz. The resonance frequency of a commercial tuning fork type quartz crystal oscillator is generally 32768Hz, the generation frequency of a signal generator is slowly swept from 32700Hz to 32850Hz, and the output voltage U of the other pin of the tuning fork is recordedoutThe resonant response curve of the tuning fork can be obtained, as shown in FIG. 3 at pure SF6In fig. 3, the horizontal axis of the response curve of the tuning fork quartz crystal oscillator obtained by the experiment indicates the crystal oscillator frequency of the tuning fork quartz crystal oscillator, and the vertical axis indicates the signal value of the voltage signal after normalization.
Wherein, the tuning fork type quartz crystal oscillator generates mechanical vibration, generates a current signal and transmits the current signal to the preamplifier, and comprises:
the tuning fork type quartz crystal oscillator generates mechanical vibration, generates a current signal corresponding to the sine signal and transmits the current signal to the preamplifier.
The other pin of the tuning fork type quartz crystal oscillator outputs a current signal, the current signal is collected through a preamplifier and is amplified to output a voltage signal to a phase-locked amplifier; the phase-locked amplifier synchronously demodulates the current signal output by the preamplifier and inputs the signal to a corresponding wireless signal sending module; through a wireless transmission mode, each wireless transmitting module transmits the data received from the phase-locked amplifier to the same wireless signal receiving module; and finally, recording the signals received by the wireless signal receiving module through a computer to obtain a resonance characteristic curve chart of the tuning fork type quartz crystal oscillator. Through a wireless transmission mode, each wireless transmitting module transmits the data received from the phase-locked amplifier to the same wireless signal receiving module; and finally, recording the signals received by the wireless signal receiving module through the terminal equipment to obtain a resonance characteristic curve chart of the tuning fork type quartz crystal oscillator.
The sulfur hexafluoride gas density monitoring method provided by the embodiment of the invention uses the sulfur hexafluoride gas density monitoring device, the device has small volume and low cost, can be installed at a plurality of places on electrical equipment, utilizes the fact that under the drive of sine electric signals with different frequencies, a tuning fork type quartz crystal oscillator generates different current signals, the current signals are sent out through a preamplifier, a phase-locked amplifier and a wireless data sending module, and then utilizes the Q value of the tuning fork type quartz crystal oscillator to emit different SF (sulfur hexafluoride) signals6Monitoring SF in electrical equipment in real time by linear reaction at gas density6The gas leaks. Therefore, the sulfur hexafluoride gas density monitoring method provided by the invention can save manual meter reading, save cost, improve safety coefficient and improve detection capability of potential insulation faults.
EXAMPLE III
The step of S22 includes:
step a: determining a voltage signal corresponding to the data;
step b: determining a maximum frequency of the voltage signal;
step c: and calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the maximum frequency.
Wherein the maximum frequencyThe frequency is the resonance frequency f of the resonance generated by the tuning fork type quartz crystal and the sine signal0。
Example four
The step of S22 includes:
calculating the quality factor Q of the tuning fork type quartz crystal oscillator by using a quality factor Q calculation formula based on the maximum frequency;
wherein, the quality factor Q calculation formula is as follows:
Q＝f0/Δf
Δ f is the frequency width at which the amplitude of the voltage signal drops by half the maximum value.
It can be understood that for tuning fork quartz crystal oscillators, the resonance frequency f0And the quality factor Q are two very important parameters, the resonance frequency f of the tuning fork quartz crystal oscillator and the sine signal0Can be represented by the following formula:
f0＝1.76a(E/ρ)1/2/l2
a is the thickness of the quartz crystal material, l is the length of the tuning fork vibrating arm, and E is the Young's modulus of the quartz crystal material (E is 10)11N/m2) ρ is the density of the quartz crystal material (ρ 2650 kg/m)3). And the Q value reflects the damping magnitude of the quartz crystal during vibration or the accumulated energy loss during vibration. The quality factor Q for a tuning fork quartz crystal oscillator can be calculated from the resonance frequency and the frequency response curve bandwidth Δ f of the crystal oscillator:
Q＝f0/Δf
Δ f is the frequency width at which the signal amplitude drops to half the maximum value, the value of which is related to the vibration damping of the tuning fork quartz crystal in the carrier gas. At one standard atmosphere of pressure, air has a relative molecular mass of about 29 and a density of about 1.16kg/m3And pure SF6The relative molecular mass of the gas was 146, and the density was 6.52kg/m3The density is 5.6 times of that of air. Thus at different SF6In the gas density, the tuning fork vibrating arms are subjected to different gas damping, so that the quality factor Q value of the tuning fork quartz crystal oscillator is influenced. With SF6Variation of density, Q of tuning fork quartz crystal oscillatorThe value will also change.
EXAMPLE five
The density of the sulfur hexafluoride gas may be calculated using a linear equation based on the quality factor Q of S23 described above.
Wherein, the linear formula is: q12794 m-88, where m is the density of sulfur hexafluoride gas.
FIG. 4 shows the same tuning fork quartz crystal oscillator at SF of different densities6Linear curve of Q value in gas, SF on the horizontal axis of FIG. 46The gas-to-nitrogen concentration ratio, the horizontal axis, is the value of the quality factor Q. In pure N2In gas, tuning fork quartz crystal oscillator has a Q value of 12827, while in pure SF6In the gas, the Q value sharply decayed to 3953 due to the gas damping effect. The Q value and SF of the tuning fork type quartz crystal oscillator can be seen6The concentration (density) of the gas is in a linear inverse proportion relation, so that the Q value of the tuning fork can be monitored in real time to realize SF6And (5) detecting the gas density.
As shown in fig. 6, a plurality of electrical devices exist in the high voltage power system, and therefore, a sulfur hexafluoride gas density monitoring device needs to be installed in the electrical devices, and a wireless data transmitting module in the sulfur hexafluoride gas density monitoring devices and a wireless data receiving module in the external device may be in a many-to-one relationship, which is a multi-point mode. When the terminal equipment in the external equipment is a computer, the density of sulfur hexafluoride gas in the plurality of electrical equipment can be monitored on the computer at the same time.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A sulfur hexafluoride gas density monitoring device, comprising: a signal generator (1), a tuning fork type quartz crystal oscillator (2), a preamplifier (3), a lock-in amplifier (4) and a wireless data transmitting module (5), the sine signal output end of the signal generator (1) is connected with one end of the tuning fork type quartz crystal oscillator (2), the synchronous signal output end of the signal generator (1) is connected with the synchronous signal input end of the phase-locked amplifier (4), the other end of the tuning fork type quartz crystal oscillator (2) is connected with the negative input end of the preamplifier (3), the positive input end of the preamplifier (3) is grounded, the output end of the preamplifier (3) is connected to the signal input end of the phase-locked amplifier (4), the output end of the phase-locked amplifier (4) is connected with the input end of the wireless data sending module (5), and the wireless data sending module (5) is communicated with external wireless equipment.
2. The sulfur hexafluoride gas density monitoring device according to claim 1, characterised in that a resistor Rg is connected across the output and negative input of the preamplifier (3).
3. The sulfur hexafluoride gas density monitoring apparatus of claim 1, wherein said external wireless device includes: the device comprises a wireless data receiving module (6) and a terminal device (7), wherein the output end of the wireless data receiving module (6) is connected with the input end of the terminal device (7).
4. A sulfur hexafluoride gas density monitoring method using the sulfur hexafluoride gas density monitoring apparatus recited in claim 1, the sulfur hexafluoride gas density monitoring method comprising:
acquiring data transmitted by a wireless data transmission module (5);
calculating a quality factor Q of the tuning fork type quartz crystal oscillator (2) based on the data;
determining the density of the sulfur hexafluoride gas based on the quality factor Q;
the data is data which is generated by a signal generator (1) according to a preset frequency step length, is a sinusoidal signal from an initial frequency to a termination frequency and is transmitted to a tuning fork type quartz crystal oscillator (2), the tuning fork type quartz crystal oscillator (2) generates mechanical vibration and generates a current signal and transmits the current signal to a preamplifier (3), the preamplifier (3) amplifies the current signal and outputs a voltage signal to a phase-locked amplifier (4), the phase-locked amplifier (4) outputs data corresponding to the voltage signal to a wireless data transmitting module (5) after adjusting the voltage signal, and the wireless data transmitting module (5) transmits the data; the data represents resonance characteristics of a tuning fork quartz crystal oscillator (2).
5. The sulfur hexafluoride gas density monitoring method as claimed in claim 4, wherein the generating of the sinusoidal signal from the initial frequency to the end frequency by the signal generator (1) according to the preset frequency steps comprises:
the signal generator (1) generates sinusoidal signals from an initial frequency to a termination frequency in an increasing mode according to a preset frequency step, and obtains the sinusoidal signals from the initial frequency to the termination frequency.
6. The sulfur hexafluoride gas density monitoring method of claim 5, wherein the tuning fork quartz crystal oscillator generates mechanical vibrations and generates a current signal for transmission to a preamplifier, including:
the tuning fork type quartz crystal oscillator generates mechanical vibration, generates a current signal corresponding to the sine signal and transmits the current signal to the preamplifier.
7. The sulfur hexafluoride gas density monitoring method of claim 4, wherein the step of calculating a quality factor Q of the tuning fork quartz crystal oscillator based on the data includes:
determining a voltage signal corresponding to the data;
determining a maximum frequency of the voltage signal;
calculating the quality factor Q of the tuning fork type quartz crystal oscillator based on the maximum frequency;
wherein the maximum frequency is the resonance frequency f of resonance generated by tuning fork quartz crystal oscillator and sine signal0。
8. The sulfur hexafluoride gas density monitoring method of claim 7, wherein the calculating a quality factor Q of a tuning fork quartz crystal oscillator based on the maximum frequency comprises:
calculating the quality factor Q of the tuning fork type quartz crystal oscillator by using a quality factor Q calculation formula based on the maximum frequency;
wherein, the quality factor Q calculation formula is as follows:
Q＝f0/Δf
Δ f is the frequency width at which the amplitude of the voltage signal drops by half the maximum value.
9. The sulfur hexafluoride gas density monitoring method of claim 4, wherein said determining the density of the sulfur hexafluoride gas based on the quality factor Q includes:
calculating the density of the sulfur hexafluoride gas using a linear formula based on the quality factor Q,
wherein, the linear formula is: q12794 m-88, where m is the density of sulfur hexafluoride gas.
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Application publication date: 20210209 Assignee: Xi'an tiger Electrical Technology Co.,Ltd. Assignor: XIDIAN University Contract record no.: X2022980006161 Denomination of invention: Sulfur hexafluoride gas density monitoring device and method Granted publication date: 20220218 License type: Common License Record date: 20220523 |