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CN114137026A - SF (sulfur hexafluoride)6Gas humidity online testing device, method and system - Google Patents

SF (sulfur hexafluoride)6Gas humidity online testing device, method and system Download PDF

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CN114137026A
CN114137026A CN202111274023.8A CN202111274023A CN114137026A CN 114137026 A CN114137026 A CN 114137026A CN 202111274023 A CN202111274023 A CN 202111274023A CN 114137026 A CN114137026 A CN 114137026A
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gas
image
humidity
temperature
microcontroller
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董金熹
陈三伟
梁洛耕
王刚
李杰科
吴春梅
戴孟云
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Liuzhou Power Supply Bureau of Guangxi Power Grid Co Ltd
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Liuzhou Power Supply Bureau of Guangxi Power Grid Co Ltd
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    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/56Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/66Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
    • G01N25/68Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point by varying the temperature of a condensing surface

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Abstract

The invention belongs to SF6The technical field of gas detection, in particular to SF6An on-line testing device, method and system for gas humidity. The testing device is directly and correspondingly fixedly connected with the air chamber to be tested, a long pipeline does not need to be connected, and the gas flow is stably ensured. The gas test is carried out on different gas chambers without heavy SF6The gas comprehensive tester is moved and carried, and the corresponding SF is automatically calculated by the microcontroller6The humidity of the gas is remotely transmitted through the wireless communication module, so that the SF can be quickly and conveniently tested6The working efficiency is greatly improved due to the humidity of the gas. At SF6The gas is dedusted before entering the measuring chamber to avoid SF6The gas pollution measuring mirror influences the test effect. The testing method adopts pressure and temperature to correct the testing result, and accurate humidity measurement data is obtained. The test system can simultaneously measure a plurality of SF6The humidity of the gas does not need to be tested one by one, the time and the labor are wasted, and the tested gas is subjected toPurify and recycle, and avoid waste.

Description

SF (sulfur hexafluoride)6Gas humidity online testing device, method and system
Technical Field
The invention belongs to SF6The technical field of gas detection, in particular to SF6An on-line testing device, method and system for gas humidity.
Background
Currently, SF is carried out in GIS transformer substation6When the gas test is in work, a tester needs to use the gas pipe to enable the gas chamber and the SF of the GIS equipment6The gas comprehensive tester is connected, and the gas pipe is too long, so that the gas pipe is easily folded in half in the testing process to influence the smoothness of the gas, and the gas measurement work is seriously hindered. Second, gas testing of different chambers requires cumbersome SF6The gas comprehensive tester is moved and carried, and wastes time and energy.
Disclosure of Invention
In order to solve the above problems, the present invention provides an SF6The gas humidity on-line test device, method and test system has the following specific technical scheme:
SF (sulfur hexafluoride)6The gas humidity online testing device comprises a shell, wherein a testing chamber and a control chamber which are separated from each other are arranged in the shell, the testing chamber is respectively connected with an air inlet pipeline and an air outlet pipeline, an inlet valve is arranged on the air inlet pipeline, and an outlet valve is arranged on the air outlet pipeline; pressure acquisition modules are arranged at the inlet of the inlet valve and the inlet of the air inlet pipe; a gas dust removal module and an inlet flowmeter are arranged between the inlet valve and the test chamber; the test chamber is internally provided with a measuring mirror, a refrigerator, a heater, a mirror surface temperature sensor and a CCD camera; an outlet flowmeter is connected between the outlet valve and the measuring chamber; a microcontroller and a wireless communication module are arranged in the control room;
the microcontroller is respectively connected with the inlet valve, the outlet valve, the inlet flowmeter, the outlet flowmeter, the CCD camera, the refrigerator, the heater, the mirror surface temperature sensor and the wireless communication moduleThe block and the pressure acquisition module are respectively and electrically connected with the microcontroller; the air inlet pipeline and SF6The air chambers are communicated and the housing is fixed at SF6An air chamber;
the air inlet pipe is used for communicating SF6An air chamber and a test chamber;
the inlet valve is used for controlling the on-off of the air inlet pipe under the control of the microcontroller, the air outlet pipe is used for communicating the test chamber with external equipment, and the outlet valve is used for controlling the on-off of the air outlet pipe under the control of the microcontroller;
the inlet flowmeter is used for measuring the gas flow passing through the gas inlet pipe and transmitting the measurement data to the microcontroller; the outlet flowmeter is used for measuring the flow of the gas flowing through the gas outlet pipe and transmitting the measurement data to the microcontroller;
the pressure acquisition module is used for acquiring SF6The pressure of the gas in the gas chamber;
the measuring mirror is used for measuring SF6The dew point of the gas; the refrigerator and the heater are respectively used for refrigerating and heating the measuring mirror under the control of the microcontroller so as to change the temperature of the measuring mirror; the mirror surface temperature sensor is arranged on the back surface of the measuring mirror and used for collecting the temperature of the measuring mirror and transmitting the collected data to the microcontroller; the CCD camera is used for collecting images of the measuring mirror and transmitting the collected images to the microcontroller; microcontroller is used for according to the measured data of import flowmeter or export flowmeter and then control the aperture of import valve or outlet valve, and the image that contrast CCD camera was gathered compares with the image of prestore, judges whether the temperature of measuring mirror reaches the dewfall temperature, and then the refrigeration power of control refrigerator or the heating power of heating ware to and combine mirror surface temperature sensor to obtain the dew point temperature data that corresponds the dewfall, and calculate according to the dew point temperature and obtain SF6And the humidity of the gas, the obtained dew point temperature data and the calculated humidity are transmitted to a remote control end through a wireless communication module.
Preferably, the gas dust removal module comprises a cyclone.
Preferably, the microcontroller is internally pre-stored with a dewing-free image, a dewing image and a frosting image, the microcontroller compares and matches the image collected by the CCD camera with the prestored dewing image and frosting image, and when the matching value exceeds a set threshold value, it is determined that the collected image matches the pre-stored corresponding image, and it is further determined that the surface of the measuring mirror is dewing-free, dewing-free or frosting, and the refrigerating power of the refrigerator or the heating power of the heater is controlled.
SF (sulfur hexafluoride)6The online testing method for the gas humidity comprises the following steps:
s1: the microcontroller is pre-stored with a non-condensation image, a condensation image and a frosting image;
s2: the microcontroller controls the inlet valve and the outlet valve to a certain opening degree according to the measurement data of the inlet flowmeter and the outlet flowmeter, and the SF in the air chamber6Gas enters the measuring mirror in the measuring chamber through the gas inlet pipe;
s3: the microprocessor controls the refrigerator to refrigerate the measuring mirror, and collects the temperature of the measuring mirror in real time through the mirror surface temperature sensor;
s4: the CCD camera collects images of the measuring mirror in real time and transmits the collected images to the microcontroller;
s5: the microcontroller calculates the characteristics of the image collected by the CCD camera, and judges which type of the image collected by the CCD camera is matched with the non-condensation image, the condensation image and the frosting image by adopting a neural network model, so as to adjust the refrigerating power of the refrigerator or the heating power of the heater;
s6: when the image acquired by the CCD camera is matched with the dew-forming image, the temperature of the measuring mirror reaches the dew-point temperature, and the dew-point temperature is corrected according to the data of the pressure acquisition module and the data of the test temperature to obtain the final SF to be measured6Dew point, humidity of the gas.
Preferably, the step S5 specifically includes:
s51: when the image collected by the CCD camera is matched with the dewing-free image, the microcontroller controls the refrigerator to continuously refrigerate the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the image collected by the CCD camera is matched with the non-dewing image, the microcontroller controls the refrigerator to continue refrigerating, then the measuring mirror has dewing, the image collected by the CCD camera is matched with the dewing image, at the moment, the microcontroller controls the heater to work, the increment of the heating power gradually becomes smaller, the temperature of the measuring mirror at the moment is collected until the image collected by the CCD camera is matched with the non-dewing image, then the microcontroller controls the refrigerator to refrigerate the measuring mirror, the refrigerating power of the refrigerator is slowly increased until the image collected by the CCD camera is matched with the dewing image, and the temperature of the measuring mirror at the moment is collected, namely the temperature of the measured SF (sulfur hexafluoride) under the current test pressure and test temperature6The dew point of the gas;
s52: when the image collected by the CCD camera is matched with the frosting image, the microcontroller controls the heater to heat the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the measurement mirror to have dew condensation after the heater heats, the image collected by the CCD camera is matched with the dew condensation image, the microcontroller controls the refrigerator to work at the moment, the increase of the refrigerating power is gradually reduced, the temperature of the measurement mirror at the moment is collected until the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the heater to heat the measurement mirror, the heating power of the heater is slowly increased until the image collected by the CCD camera is matched with the dew condensation image, and the temperature of the measurement mirror at the moment is collected, namely the temperature of the measured SF under the current test pressure and the test temperature6The dew point of the gas.
Preferably, the neural network model is trained by using a non-condensation image, a condensation image and a frosting image in advance, and the training is stopped after the matching precision exceeds a set precision threshold value to obtain the trained neural network model.
Preferably, the dew point temperature is corrected according to the data of the pressure acquisition module and the data of the test temperature to obtain the final SF to be tested6The dew point, humidity and moisture content of the gas are as follows:
s61: according to the pressureThe data of the force acquisition module knows the current non-atmospheric pressure PoKnowing the corresponding saturated water vapour pressure P of the measured dew point at non-atmospheric pressure from the measured dew point temperaturewoThen the corresponding saturated water vapour pressure P of the measured dew point at atmospheric pressure is calculated according to equation (1)wa
Figure RE-GDA0003470996180000031
According to the corresponding saturated water vapor pressure P of the measured dew point under the atmospheric pressure obtained by calculationwaFurther obtaining the corrected dew point temperature under the corresponding atmospheric pressure;
s62: obtaining a corresponding humidity value V according to the dew point temperature under the atmospheric pressure obtained in the step S61X(t)
S63: and correcting the obtained humidity value by adopting temperature, which comprises the following specific steps:
Figure RE-GDA0003470996180000032
or:
Figure RE-GDA0003470996180000033
wherein, VY(t)Converting the measured value at the test temperature into a humidity value at 20 ℃; vX(t)Is the actually measured humidity value at the test temperature; vX(0)、VX(1)Respectively, are the nearest integer values to the measured values at the same ambient temperature, and VX(0)<VX(t)<VX(1);VY(0)、VY(1)Are each VX(0)、VX(1)Converted to a humidity value at 20 ℃.
SF (sulfur hexafluoride)6The gas humidity on-line test system comprises a remote control end and a plurality of SFs6Gas humidity on-line test device, each SF6Gas humidity online testing device and corresponding SF6Gas chambers are communicated, and a plurality of said SFs6The gas humidity online testing device is respectively in data interaction with the remote control end.
Preferably, the system also comprises a plurality of gas recovery devices, wherein each gas recovery device comprises an adsorption purification device, a buffer container, a flow controller, a pressurization device and a storage container; the adsorption module is connected with an air blowing port of the air outlet pipe; the adsorption module, the buffer container, the flow controller, the supercharging device and the storage container are sequentially connected; the storage container passes through the air return valve and the SF6The air chambers are communicated; the flow controller, the supercharging device and the air return valve are electrically connected with the microcontroller;
the adsorption and purification device is used for testing the SF6Purifying the gas, and purifying the purified SF6Gas is fed into a buffer vessel, and the flow controller is used for controlling the purified SF in the buffer vessel6The flow rate of gas input into the storage vessel; the supercharging device is used for purifying the SF under the control of the microcontroller6Pressurizing the gas; the storage container is used for storing the purified SF6A gas; the air return valve is used for controlling the purified SF6Whether the gas flows back into the tested gas chamber or not; each gas recovery unit and SF6The gas humidity online testing devices are connected in a one-to-one correspondence manner.
The invention has the beneficial effects that: SF provided by the invention6The gas humidity on-line testing device is directly and fixedly connected with the corresponding tested gas chamber, a long pipeline does not need to be connected, and the gas flow is stably ensured. And the gas test is carried out on different gas chambers, and the heavy SF is not required6The gas comprehensive tester is moved and carried, and the corresponding SF is automatically calculated by the microcontroller6The humidity of the gas is remotely transmitted through the wireless communication module, so that the SF can be quickly and conveniently tested6The humidity of the gas greatly improves the working efficiency, saves the working time and has high data precision. At SF6The gas is dedusted before entering the measuring chamber to avoid SF6The gas pollution measuring mirror influences the test effect.
The testing method provided by the invention does not need to adopt a longer pipeline to connect the air chamber, and adopts pressure and temperature to correct so as to obtain accurate humidity measurement data.
The test system provided by the invention can simultaneously measure a plurality of SFs6The humidity of gas need not the test one by one, wastes time and energy, purifies the recovery to the gas after the test moreover, avoids extravagant. Moreover, the SF can be known in real time through the invention6The humidity of the gas, a matched alarm can be arranged at the remote control end, and the SF to be tested6And alarming when the humidity of the gas exceeds a preset value.
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In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a testing apparatus of the present invention;
FIG. 2 is a schematic diagram of a test system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in FIG. 1, a SF6The gas humidity online testing device comprises a shell, wherein a testing chamber and a control chamber which are separated from each other are arranged in the shell, the testing chamber is respectively connected with an air inlet pipeline and an air outlet pipeline, an inlet valve is arranged on the air inlet pipeline, and an outlet valve is arranged on the air outlet pipeline; pressure acquisition modules are arranged at the inlet valve and the inlet of the air inlet pipe; a gas dust removal module and an inlet flowmeter are arranged between the inlet valve and the test chamber; a measuring mirror, a refrigerator, a heater, a mirror surface temperature sensor and a CCD camera are arranged in the test chamber; an outlet flowmeter is connected between the outlet valve and the measuring chamber; a microcontroller and a wireless communication module are arranged in the control room; the microcontroller is respectively and electrically connected with the inlet valve, the outlet valve, the inlet flowmeter, the outlet flowmeter, the CCD camera, the refrigerator, the heater, the mirror surface temperature sensor, the wireless communication module and the pressure acquisition module; air inlet duct and SF6The air chambers are communicated and the housing is fixed at SF6An air chamber;
the air inlet pipe is used for communicating SF6An air chamber and a test chamber;
the inlet valve is used for controlling the on-off of the air inlet pipe under the control of the microcontroller, the air outlet pipe is used for communicating the test chamber with external equipment, and the outlet valve is used for controlling the on-off of the air outlet pipe under the control of the microcontroller;
the inlet flowmeter is used for measuring the gas flow passing through the gas inlet pipe and transmitting the measurement data to the microcontroller; the outlet flowmeter is used for measuring the gas flow passing through the gas outlet pipe and transmitting the measurement data to the microcontroller;
the pressure acquisition module is used for acquiring SF6The pressure of the gas in the gas chamber;
measuring mirrors for measuring SF6The dew point of the gas; the refrigerator and the heater are respectively used for refrigerating and heating the measuring mirror under the control of the microcontroller so as to change the temperature of the measuring mirror; the mirror surface temperature sensor is arranged on the back surface of the measuring mirror and used for collecting the temperature of the measuring mirror and transmitting the collected data to the microcontroller; the CCD camera is used for collecting the image of the measuring mirror and transmitting the collected image to the microcontroller; the microcontroller is used for controlling the opening degree of the inlet valve or the outlet valve according to the measurement data of the inlet flowmeter or the outlet flowmeter, comparing the image collected by the CCD camera with the image stored in advance, judging whether the temperature of the measuring mirror reaches the dewing temperature or not, further controlling the refrigerating power of the refrigerator or the heating power of the heater, obtaining dew point temperature data corresponding to dewing by combining the mirror surface temperature sensor, and calculating according to the dew point temperature to obtain SF6And the humidity of the gas, the obtained dew point temperature data and the calculated humidity are transmitted to a remote control end through a wireless communication module.
Wherein, the gas dust removal module comprises a cyclone separator.
The micro-controller is internally pre-stored with a dewing-free image, a dewing image and a frosting image, the micro-controller compares and matches the image collected by the CCD camera with the prestored dewing image and frosting image, when the matching value exceeds a set threshold value, the micro-controller judges that the collected image is matched with the prestored corresponding image, and then judges that the surface of the measuring mirror is dewing-free, dewing or frosting, and further controls the refrigerating power of the refrigerator or the heating power of the heater.
The testing device provided by the invention can be directly connected with the air chamber, so that the air path connection between the air measuring equipment and the air chamber is reduced. The tester only needs to install the testing device of the invention on the SF to be tested6On the air chamber, a control signal is sent to the microprocessor in the control chamber, so that the air chamber SF can be automatically calculated6Humidity of gas, dew point information. To the maximum extent shorten SF6Measuring the length of time required for gas work, greatlyThe working efficiency is improved.
The embodiment also provides an SF6The online testing method for the gas humidity comprises the following steps:
s1: the microcontroller stores a non-condensation image, a condensation image and a frosting image in advance.
S2: the microcontroller controls the inlet valve and the outlet valve to a certain opening degree according to the measurement data of the inlet flowmeter and the outlet flowmeter, and the SF in the air chamber6The gas enters the measuring mirror in the measuring chamber through the gas inlet pipe.
S3: the microprocessor controls the refrigerator to refrigerate the measuring mirror, and the temperature of the measuring mirror is collected in real time through the mirror surface temperature sensor.
S4: the CCD camera collects images of the measuring mirror in real time and transmits the collected images to the microcontroller.
S5: the microcontroller calculates the characteristics of the image collected by the CCD camera, and judges which type of the image collected by the CCD camera is matched with the non-condensation image, the condensation image and the frosting image by adopting a neural network model, so as to adjust the refrigerating power of the refrigerator or the heating power of the heater; the neural network model is trained by adopting a non-condensation image, a condensation image and a frosting image in advance, and the training is stopped after the matching precision exceeds a set precision threshold value, so that the trained neural network model is obtained. The method specifically comprises the following steps:
s51: when the image collected by the CCD camera is matched with the dewing-free image, the microcontroller controls the refrigerator to continuously refrigerate the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the image collected by the CCD camera is matched with the non-dewing image, the microcontroller controls the refrigerator to continue refrigerating, the measuring mirror is dewed, the image collected by the CCD camera is matched with the dewing image, the microcontroller controls the heater to work at the moment, the increment of the heating power is gradually reduced, the temperature of the measuring mirror at the moment is collected until the image collected by the CCD camera is matched with the non-dewing image, the microcontroller controls the refrigerator to refrigerate the measuring mirror, the refrigerating power of the refrigerator is slowly increased until the image collected by the CCD camera is reachedMatching with the dew formation image, collecting the temperature of the measuring mirror at the moment, namely the measured SF under the current test pressure and test temperature6The dew point of the gas;
s52: when the image collected by the CCD camera is matched with the frosting image, the microcontroller controls the heater to heat the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the measurement mirror to have dew condensation after the heater heats, the image collected by the CCD camera is matched with the dew condensation image, the microcontroller controls the refrigerator to work at the moment, the increase of the refrigerating power is gradually reduced, the temperature of the measurement mirror at the moment is collected until the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the heater to heat the measurement mirror, the heating power of the heater is slowly increased until the image collected by the CCD camera is matched with the dew condensation image, and the temperature of the measurement mirror at the moment is collected, namely the temperature of the measured SF under the current test pressure and the test temperature6The dew point of the gas.
S6: when the image acquired by the CCD camera is matched with the dew-forming image, the temperature of the measuring mirror reaches the dew-point temperature, and the dew-point temperature is corrected according to the data of the pressure acquisition module and the data of the test temperature to obtain the final SF to be measured6Dew point, humidity of the gas. The method specifically comprises the following steps:
s61: knowing the current non-atmospheric pressure P from the data of the pressure acquisition moduleoKnowing the corresponding saturated water vapour pressure P of the measured dew point at non-atmospheric pressure from the measured dew point temperaturewoThen the corresponding saturated water vapour pressure P of the measured dew point at atmospheric pressure is calculated according to equation (1)wa
Figure RE-GDA0003470996180000071
According to the corresponding saturated water vapor pressure P of the measured dew point under the atmospheric pressure obtained by calculationwaAnd further obtaining the corrected dew point temperature at the corresponding atmospheric pressure;
S62: obtaining a corresponding humidity value V according to the dew point temperature under the atmospheric pressure obtained in the step S61X(t)
S63: and correcting the obtained humidity value by adopting temperature, which comprises the following specific steps:
Figure RE-GDA0003470996180000072
or:
Figure RE-GDA0003470996180000073
wherein, VY(t)Converting the measured value at the test temperature into a humidity value at 20 ℃; vX(t)Is the actually measured humidity value at the test temperature; vX(0)、VX(1)Respectively, are the nearest integer values to the measured values at the same ambient temperature, and VX(0)<VX(t)<VX(1);VY(0)、 VY(1)Are each VX(0)、VX(1)Converted to a humidity value at 20 ℃.
In order to solve the technical problems of low testing speed and low efficiency of the existing independent test of each air chamber, the invention also provides an SF6The gas humidity on-line test system, as shown in FIG. 2, comprises a remote control end, a plurality of SFs6Gas humidity on-line test device, each SF6Gas humidity online testing device and corresponding SF6Gas chambers are communicated and a plurality of SF6The gas humidity online testing device is respectively in data interaction with the remote control end.
SF6The gas humidity online testing system also comprises a plurality of gas recovery devices, and each gas recovery device comprises an adsorption purification device, a buffer container, a flow controller, a supercharging device and a storage container; the adsorption module is connected with an air blowing port of the air outlet pipe; the adsorption module, the buffer container, the flow controller, the supercharging device and the storage container are sequentially connected; the storage container passes through the air return valve and the SF6Air chamberCommunicating; the flow controller, the supercharging device and the air return valve are electrically connected with the microcontroller;
the adsorption and purification device is used for testing the SF6Purifying the gas, and purifying the purified SF6The gas is fed into a buffer vessel, and a flow controller is used for controlling the purified SF in the buffer vessel6The flow rate of gas input into the storage vessel; the supercharging device is used for purifying the SF under the control of the microcontroller6Pressurizing the gas; the storage container is used for storing the purified SF6A gas; the air return valve is used for controlling purified SF6Whether the gas flows back into the tested gas chamber or not; each gas recovery unit and SF6The gas humidity online testing devices are connected in a one-to-one correspondence manner.
The test system provided by the invention can simultaneously measure a plurality of SFs6The humidity of gas need not the test one by one, wastes time and energy, purifies the recovery to the gas after the test moreover, avoids extravagant. Moreover, the SF can be known in real time through the invention6The humidity of the gas, a matched alarm can be arranged at the remote control end, and the SF to be tested6And alarming when the humidity of the gas exceeds a preset value.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the division of the unit is only one division of logical functions, and other division manners may be used in actual implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (9)

1. SF (sulfur hexafluoride)6On-line testing device of gas humidity, its characterized in that: the device comprises a shell, wherein a test chamber and a control chamber which are spaced apart are arranged in the shell, the test chamber is respectively connected with an air inlet pipeline and an air outlet pipeline, an inlet valve is arranged on the air inlet pipeline, and an outlet valve is arranged on the air outlet pipeline; pressure acquisition modules are arranged at the inlet of the inlet valve and the inlet of the air inlet pipe; a gas dust removal module and an inlet flowmeter are arranged between the inlet valve and the test chamber; the test chamber is internally provided with a measuring mirror, a refrigerator, a heater, a mirror surface temperature sensor and a CCD camera; an outlet flowmeter is connected between the outlet valve and the measuring chamber; a microcontroller and a wireless communication module are arranged in the control room;
the microcontroller is respectively and electrically connected with the inlet valve, the outlet valve, the inlet flowmeter, the outlet flowmeter, the CCD camera, the refrigerator, the heater, the mirror surface temperature sensor, the wireless communication module and the pressure acquisition module; the air inlet pipeline and SF6The air chambers are communicated and the housing is fixed at SF6An air chamber;
the air inlet pipe is used for communicating SF6An air chamber and a test chamber;
the inlet valve is used for controlling the on-off of the air inlet pipe under the control of the microcontroller, the air outlet pipe is used for communicating the test chamber with external equipment, and the outlet valve is used for controlling the on-off of the air outlet pipe under the control of the microcontroller;
the inlet flowmeter is used for measuring the gas flow passing through the gas inlet pipe and transmitting the measurement data to the microcontroller; the outlet flowmeter is used for measuring the flow of the gas flowing through the gas outlet pipe and transmitting the measurement data to the microcontroller;
the pressure acquisition module is used for acquiring SF6The pressure of the gas in the gas chamber;
the measuring mirror is used for measuring SF6The dew point of the gas; the refrigerator and the heater are respectively used for refrigerating and heating the measuring mirror under the control of the microcontroller so as to change the temperature of the measuring mirror; the mirror surface temperature sensor is arranged on the back surface of the measuring mirror and used for collecting the temperature of the measuring mirror and transmitting the collected data to the microcontroller; the CCD camera is used for collecting images of the measuring mirror and transmitting the collected images to the microcontroller; microcontroller is used for according to the measured data of import flowmeter or export flowmeter and then control the aperture of import valve or outlet valve, and the image that contrast CCD camera was gathered compares with the image of prestore, judges whether the temperature of measuring mirror reaches the dewfall temperature, and then the refrigeration power of control refrigerator or the heating power of heating ware to and combine mirror surface temperature sensor to obtain the dew point temperature data that corresponds the dewfall, and calculate according to the dew point temperature and obtain SF6And the humidity of the gas, the obtained dew point temperature data and the calculated humidity are transmitted to a remote control end through a wireless communication module.
2. SF according to claim 16On-line testing device of gas humidity, its characterized in that: the gas dust removal module comprises a cyclone separator.
3. SF according to claim 16On-line testing device of gas humidity, its characterized in that: the micro-controller is characterized in that a dewing-free image, a dewing image and a frosting image are pre-stored in the micro-controller, the micro-controller is used for comparing and matching the image collected by the CCD camera with the prestored dewing image and frosting image, and when the matching value exceeds a set threshold value, the collected image and the pre-stored pair are judgedAnd judging whether the surface of the measuring mirror has no dew condensation, condensation or frost formation by image matching, and further controlling the refrigerating power of the refrigerator or the heating power of the heater.
4. SF (sulfur hexafluoride)6The on-line testing method for the gas humidity is characterized by comprising the following steps: the method comprises the following steps:
s1: the microcontroller is pre-stored with a non-condensation image, a condensation image and a frosting image;
s2: the microcontroller controls the inlet valve and the outlet valve to a certain opening degree according to the measurement data of the inlet flowmeter and the outlet flowmeter, and the SF in the air chamber6Gas enters the measuring mirror in the measuring chamber through the gas inlet pipe;
s3: the microprocessor controls the refrigerator to refrigerate the measuring mirror, and collects the temperature of the measuring mirror in real time through the mirror surface temperature sensor;
s4: the CCD camera collects images of the measuring mirror in real time and transmits the collected images to the microcontroller;
s5: the microcontroller calculates the characteristics of the image collected by the CCD camera, and judges which type of the image collected by the CCD camera is matched with the non-condensation image, the condensation image and the frosting image by adopting a neural network model, so as to adjust the refrigerating power of the refrigerator or the heating power of the heater;
s6: when the image acquired by the CCD camera is matched with the dew-forming image, the temperature of the measuring mirror reaches the dew-point temperature, and the dew-point temperature is corrected according to the data of the pressure acquisition module and the data of the test temperature to obtain the final SF to be measured6Dew point, humidity of the gas.
5. An SF according to claim 46The on-line testing method for the gas humidity is characterized by comprising the following steps: the step S5 specifically includes:
s51: when the image collected by the CCD camera is matched with the dewing-free image, the microcontroller controls the refrigerator to continuously refrigerate the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the CCD camera collectsWhen the image is matched with the non-dewing image, the microcontroller controls the refrigerator to continue refrigerating, the measuring mirror is dewed, the image collected by the CCD camera is matched with the dewing image, the microcontroller controls the heater to work at the moment, the increment of the heating power is gradually reduced, the temperature of the measuring mirror at the moment is collected until the image collected by the CCD camera is matched with the non-dewing image, the microcontroller controls the refrigerator to refrigerate the measuring mirror, the refrigerating power of the refrigerator is slowly increased until the image collected by the CCD camera is matched with the dewing image, and the temperature of the measuring mirror at the moment is collected, namely the temperature of the measured SF under the current test pressure and the test temperature6The dew point of the gas;
s52: when the image collected by the CCD camera is matched with the frosting image, the microcontroller controls the heater to heat the measuring mirror until the image collected by the CCD camera is matched with the dewing image; the method specifically comprises the following steps:
when the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the measurement mirror to have dew condensation after the heater heats, the image collected by the CCD camera is matched with the dew condensation image, the microcontroller controls the refrigerator to work at the moment, the increase of the refrigerating power is gradually reduced, the temperature of the measurement mirror at the moment is collected until the image collected by the CCD camera is matched with the frosted image, the microcontroller controls the heater to heat the measurement mirror, the heating power of the heater is slowly increased until the image collected by the CCD camera is matched with the dew condensation image, and the temperature of the measurement mirror at the moment is collected, namely the temperature of the measured SF under the current test pressure and the test temperature6The dew point of the gas.
6. An SF according to claim 46The on-line testing method for the gas humidity is characterized by comprising the following steps: the neural network model is trained by adopting a non-condensation image, a condensation image and a frosting image in advance, and the training is stopped after the matching precision exceeds a set precision threshold value, so that the trained neural network model is obtained.
7. An SF according to claim 46The on-line testing method for the gas humidity is characterized by comprising the following steps: said according toCorrecting the dew point temperature by the data of the pressure acquisition module and the data of the test temperature to obtain the final SF to be tested6The dew point, humidity and moisture content of the gas are as follows:
s61: knowing the current non-atmospheric pressure P from the data of the pressure acquisition moduleoKnowing the corresponding saturated water vapour pressure P of the measured dew point at non-atmospheric pressure from the measured dew point temperaturewoThen the corresponding saturated water vapour pressure P of the measured dew point at atmospheric pressure is calculated according to equation (1)wa
Figure RE-FDA0003470996170000031
According to the corresponding saturated water vapor pressure P of the measured dew point under the atmospheric pressure obtained by calculationwaFurther obtaining the corrected dew point temperature under the corresponding atmospheric pressure;
s62: obtaining a corresponding humidity value V according to the dew point temperature under the atmospheric pressure obtained in the step S61X(t)
S63: and correcting the obtained humidity value by adopting temperature, which comprises the following specific steps:
Figure RE-FDA0003470996170000032
or:
Figure RE-FDA0003470996170000033
wherein, VY(t)Converting the measured value at the test temperature into a humidity value at 20 ℃; vX(t)Is the actually measured humidity value at the test temperature; vX(0)、VX(1)Respectively, are the nearest integer values to the measured values at the same ambient temperature, and VX(0)<VX(t)<VX(1);VY(0)、VY(1)Are each VX(0)、VX(1)Converted to 20 deg.CThe humidity value of (a).
8. SF (sulfur hexafluoride)6Gas humidity on-line test system which characterized in that: comprises a remote control terminal and a plurality of SFs6Gas humidity on-line test device, each SF6Gas humidity online testing device and corresponding SF6Gas chambers are communicated, and a plurality of said SFs6The gas humidity online testing device is respectively in data interaction with the remote control end.
9. An SF according to claim 86Gas humidity on-line test system which characterized in that: the device also comprises a plurality of gas recovery devices, wherein each gas recovery device comprises an adsorption purification device, a buffer container, a flow controller, a supercharging device and a storage container; the adsorption module is connected with an air blowing port of the air outlet pipe; the adsorption module, the buffer container, the flow controller, the supercharging device and the storage container are sequentially connected; the storage container passes through the air return valve and the SF6The air chambers are communicated; the flow controller, the supercharging device and the air return valve are electrically connected with the microcontroller;
the adsorption and purification device is used for testing the SF6Purifying the gas, and purifying the purified SF6Gas is fed into a buffer vessel, and the flow controller is used for controlling the purified SF in the buffer vessel6The flow rate of gas input into the storage vessel; the supercharging device is used for purifying the SF under the control of the microcontroller6Pressurizing the gas; the storage container is used for storing the purified SF6A gas; the air return valve is used for controlling the purified SF6Whether the gas flows back into the tested gas chamber or not; each gas recovery unit and SF6The gas humidity online testing devices are connected in a one-to-one correspondence manner.
CN202111274023.8A 2021-10-29 2021-10-29 SF (sulfur hexafluoride)6Gas humidity online testing device, method and system Pending CN114137026A (en)

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