CN112033767A - Reciprocating gas storage type sulfur hexafluoride gas online sampling device and sampling method - Google Patents
Reciprocating gas storage type sulfur hexafluoride gas online sampling device and sampling method Download PDFInfo
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- CN112033767A CN112033767A CN202010812791.3A CN202010812791A CN112033767A CN 112033767 A CN112033767 A CN 112033767A CN 202010812791 A CN202010812791 A CN 202010812791A CN 112033767 A CN112033767 A CN 112033767A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
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Abstract
The invention discloses a reciprocating gas storage type sulfur hexafluoride gas online sampling device, which is used in electromagnetic valve equipment, and comprises a first electromagnetic valve, a gas detection unit, a second electromagnetic valve, a gas pumping and charging unit, a third electromagnetic valve, a gas storage unit and a controller; the first electromagnetic valve, the gas detection unit, the second electromagnetic valve and the gas pumping and inflating unit are sequentially connected to form a main gas circuit; one port of the third electromagnetic valve is connected to the pipeline between the second electromagnetic valve and the air pumping and inflating unit, and the other port of the third electromagnetic valve is connected with the air storage unit to form a branch air path. The device realizes on-line monitoring of gas decomposition products and effective sampling detection of indexes of the decomposition products by arranging the gas pumping and charging unit in the past gas storage returning mode, and simultaneously, more than 95% of gas samples are charged back to the switch equipment, so that the gas consumption is reduced to the maximum extent.
Description
Technical Field
The invention relates to the field of gas sampling, in particular to a reciprocating gas storage type sulfur hexafluoride gas online sampling device and a sampling method.
Background
The sulfur hexafluoride has good electrical insulation performance and excellent arc extinguishing performance, the electric strength of the sulfur hexafluoride is 2.5 times of that of nitrogen under the same pressure, the breakdown voltage of the sulfur hexafluoride is 2.5 times of that of air, and the arc extinguishing capacity of the sulfur hexafluoride is 100 times of that of air, so that the sulfur hexafluoride is an excellent new generation ultrahigh voltage insulation dielectric material. Sulfur hexafluoride is widely used as a gas insulating material for high-voltage switches, large-capacity transformers, high-voltage cables, and the like due to its excellent insulating and arc-extinguishing properties. When high-voltage switch equipment in a transformer substation is in operation, because of the phenomenon of partial discharge or heating in the transformer substation, the high-voltage switch equipment inevitably can be ionized and decomposed in internal insulating gas, various gas decomposition products are generated, and the insulating property of the equipment is influenced.
At present, a transformer substation maintainer mainly detects decomposition products in gas regularly by using an off-line instrument to check fault hidden danger, the detection method is poor in real-time performance and cannot find faults in time, and sulfur hexafluoride gas in switch equipment is consumed greatly in the detection process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a reciprocating gas storage type sulfur hexafluoride gas online sampling device and a sampling method, so as to solve the problem that sulfur hexafluoride gas in switch equipment is consumed greatly in the detection process and reduce gas consumption.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in a first aspect, the embodiment of the invention provides a reciprocating gas storage type sulfur hexafluoride gas online sampling device, which is used in electromagnetic valve equipment, and comprises a first electromagnetic valve, a gas detection unit, a second electromagnetic valve, a gas pumping and charging unit, a third electromagnetic valve, a gas storage unit and a controller;
the first electromagnetic valve, the gas detection unit, the second electromagnetic valve and the gas pumping and inflating unit are sequentially connected to form a main gas circuit;
one port of the third electromagnetic valve is connected to the pipeline between the second electromagnetic valve and the air pumping and inflating unit, and the other port of the third electromagnetic valve is connected with the air storage unit to form a branch air path;
the controller is respectively connected with the first electromagnetic valve, the gas detection unit, the second electromagnetic valve, the gas pumping unit and the third electromagnetic valve in a signal mode and used for controlling the first electromagnetic valve, the gas detection unit, the second electromagnetic valve, the gas pumping unit and the third electromagnetic valve to work.
Furthermore, the sampling device also comprises an air pump, the air pump is connected in the main air path or the branch air path, and the work of the air pump is controlled by the controller.
Further, a fourth solenoid valve is further provided in the pipe between the first solenoid valve and the gas detection unit, and the operation of the fourth solenoid valve is controlled by the controller.
Further, the sampling device also comprises an air pump, the air pump is connected in a pipeline between the first electromagnetic valve and the fourth electromagnetic valve, and the work of the air pump is controlled by the controller.
Further, the sampling device further comprises a pressure sensor, the pressure sensor is used for monitoring the gas pressure value of the main gas circuit or the branch gas circuit and transmitting the monitored gas pressure value to the controller, and the controller sends out a control instruction according to the monitored gas pressure value.
Further, the pressure sensor is arranged in a pipeline between the third electromagnetic and gas storage unit.
Furthermore, the air pumping and inflating unit comprises a piston cylinder and a stepping motor, and the stepping motor is used for pushing and pulling a linkage rod of the piston cylinder so as to realize air pumping or inflating of the main air passage or the branch air passage of the piston cylinder.
Further, an air outlet of the air suction pump is connected to an air outlet; a fifth electromagnetic valve is arranged in a pipeline between the air outlet and the air outlet of the air pump, and the operation of the fifth electromagnetic valve is controlled by the controller.
Further, the gas storage unit is a gas storage tank.
In a second aspect, an embodiment of the present invention provides an online sampling method for reciprocating gas storage type sulfur hexafluoride gas, where the method is performed by using the above sampling apparatus, and includes:
firstly, vacuumizing the gas path of the whole device, connecting a first electromagnetic valve to a gas taking/recharging port of the switch device, detecting whether the signal values of a gas detection unit and a pressure sensor are normal, starting the first electromagnetic valve after the signal values are normal, then starting a second electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, allowing a gas sample in the switch device to flow into a gas storage unit, observing the signal value of the pressure sensor, and finishing a gas taking process after the pressure value of the pressure sensor is the same as the gas pressure value in the switch device;
starting a detection function of the gas detection unit, and after the detection of the decomposition product of the gas sample is finished, entering the following gas refilling process:
firstly, closing a second electromagnetic valve, starting a stepping motor to pull a piston cylinder linkage rod, pumping gas in a gas storage unit into a piston cylinder, then closing a third electromagnetic valve, opening the second electromagnetic valve, starting the stepping motor to push the piston cylinder linkage rod, and pressing gas in the cylinder back into the switch equipment along the gas path of the second electromagnetic valve, a gas detection unit, a fourth electromagnetic valve and a first electromagnetic valve, thus finishing a gas back-filling process;
repeating the gas refilling process for multiple times, stopping refilling until the pressure sensor detects that the gas pressure value in the gas storage tank is reduced to a set value, so that the gas sample in the gas storage tank is filled back into the switch device, and entering the following residual gas emptying process:
the first electromagnetic valve is closed, the fifth electromagnetic valve is started, the air pump is started to pump residual gas samples in the air path, the evacuation process is completed, and the whole operation process is completed.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas decomposition product detection means is upgraded from an off-line detection mode to an on-line monitoring mode, so that the real-time performance and the data reliability of detection are improved;
(2) other gas index on-line monitoring systems (such as gas humidity and density) detect static gas samples, the gas samples are not extracted from the equipment body, so that the gas samples measured each time are all gas in a pipeline and cannot effectively reflect gas indexes in the switchgear;
(3) after the device technology is used, more than 95% of gas samples can be filled back into the switch equipment after the gas on-line monitoring system is detected every time, and the gas consumption is reduced to the maximum extent.
Drawings
Fig. 1 is a schematic composition diagram of a reciprocating gas storage type sulfur hexafluoride gas online sampling device provided in an embodiment of the present invention;
in the figure: 1. a first solenoid valve; 2. a gas detection unit; 3. a second solenoid valve; 4. an air pumping and inflating unit; 5. a third electromagnetic valve; 6. a gas storage unit; 7. a pressure sensor; 8. an air pump; 9. a fourth solenoid valve; 10. a fifth solenoid valve; 41. a piston cylinder; 42. a stepper motor.
Detailed Description
Example (b):
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection and signal connection; they may be directly connected or indirectly connected through an intermediate member, so to speak, connected internally to the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the online sampling device for sulfur hexafluoride gas storage in a reciprocating manner according to the present embodiment is used in a switch device, and the sampling device mainly includes a first electromagnetic valve 1, a gas detection unit 2, a second electromagnetic valve 3, an air pumping and inflating unit 4, a third electromagnetic valve 5, an air storage unit 6, and a controller (not shown).
The first electromagnetic valve 1, the gas detection unit 2, the second electromagnetic valve 3 and the gas pumping and inflating unit 4 are sequentially connected to form a main gas path; one port of the third electromagnetic valve 5 is connected to the pipeline between the second electromagnetic valve 3 and the air pumping and inflating unit 4, and the other port is connected with the air storage unit 6 to form a branch air path; the controller is respectively connected with the first electromagnetic valve 1, the gas detection unit 2, the second electromagnetic valve 3, the gas pumping unit 4 and the third electromagnetic valve 5 in a signal mode and used for controlling the first electromagnetic valve 1, the gas detection unit 2, the second electromagnetic valve 3, the gas pumping unit 4 and the third electromagnetic valve 5 to work.
When the device is used for sampling gas, the first electromagnetic valve 1 is connected to a gas taking/recharging port of the switch device, then the sulfur hexafluoride gas in the opened equipment can flow into the gas storage unit 6 along the main gas path and through the branch gas paths, after a period of time, the gas detection unit 2 is activated again to detect the gas in the gas path, and thus, because the gas storage unit 6 temporarily stores the gas in the front end pipeline, the gas detection unit 2 can effectively sample the sample in the switch device body, compared with other existing on-line monitoring systems for gas indexes (such as gas humidity and density) which detect static gas samples and do not extract the gas samples from the equipment body, the gas samples detected each time are all gas in a pipeline, and the gas indexes in the switchgear cannot be effectively reflected, the effectiveness of detection data can be greatly improved by adopting the device; after the sample detection is finished, the second electromagnetic valve 3 can be closed, the pumping and inflating unit 4 starts pumping and inflating to temporarily pump the gas stored in the gas storage unit 6, the third electromagnetic valve 5 is closed after the pumping and inflating are finished, then the second electromagnetic valve 3 is opened, the pumping and inflating unit starts inflating to inflate the temporarily stored gas back to the switch device along the main gas path, and therefore, the pumping and inflating unit is arranged, online monitoring of gas decomposition products is achieved by adopting a reciprocating gas storage method, meanwhile, more than 95% of gas samples are inflated back to the switch device, and gas consumption is reduced to the maximum extent.
Preferably, the sampling device further comprises an air pump 8, the air pump 8 is connected to the main air path or the branch air paths, and the work of the air pump 8 is controlled by the controller, so that the air pump 8 can be started after the air is back-filled, and all the air in the air paths can be emptied under the action of the air pump 8, thereby ensuring the validity of the detection data in the next detection.
As another preferred example of the sampling device, a fourth solenoid valve 9 is further provided in a pipe between the first solenoid valve 1 and the gas detection unit 2, and the operation of the fourth solenoid valve 9 is controlled by a controller. That is to say, be provided with two solenoid valve switches in the pipeline before gaseous detecting element 2, so, when the change over switch equipment, can be used for keeping apart right-hand member gas circuit, with the gaseous evacuation in the former switchgear, also can play the effect of dual guarantee simultaneously, if first solenoid valve 1 damages, fourth solenoid valve 9 can regard as reserve. In this case, in particular, the above-mentioned air pump 8 is connected in the pipeline between the first solenoid valve 1 and the fourth solenoid valve 9 to realize the evacuation of all the gas in the gas circuit of the sampling device and the evacuation of the gas in the switchgear, and in addition, the air outlet of the air pump 8 is connected to the exhaust port to facilitate the uniform collection of the gas; a fifth solenoid valve 10 is further provided in the line between the outlet and the exhaust of the suction pump 8 to control the discharge of gas.
As another preferable selection of the sampling device, the sampling device further includes a pressure sensor 7, the pressure sensor 7 is configured to monitor a gas pressure value of the main gas path or the branch gas path, and transmit the monitored gas pressure value to the controller, and the controller sends a control instruction according to the monitored gas pressure value. After the pressure sensor 7 detects that the gas pressure value in the gas path is the same as the gas pressure value in the switchgear, the controller sends a control instruction to control the gas detection unit 2 to start, and the gas pressure value in the gas path is the same as the gas pressure value in the switchgear, so that the gas detection unit 2 can be further ensured to effectively sample the sample in the switchgear body, and the validity of the detection data is further improved. More preferably, the pressure sensor 7 is disposed in the pipeline between the third solenoid valve 5 and the gas storage unit 6, so that the pressure sensor 7 can also be used to detect the pressure of the gas in the gas storage unit 6 after the second solenoid valve 3 is closed, and when the pressure of the gas in the gas storage unit 6 is detected to be reduced to 0.001Mpa, the recharging operation of the gas pumping unit 4 is stopped, so that the gas sample in the gas storage unit 6 has completed recharging the switch device.
Specifically, the pumping and inflating unit 4 includes a piston cylinder 41 and a stepping motor 42, and the stepping motor 42 pushes and pulls a linkage rod of the piston cylinder 41 under the control of the controller, so as to pump or inflate the main air passage or the branch air passage of the piston cylinder 41. The gas storage unit 6 is a gas storage tank and is a stainless steel container. Of course, the device also includes a power source 12 to provide power for operation of the other components of the device.
Correspondingly, the embodiment also provides an online sampling method for the reciprocating gas storage type sulfur hexafluoride gas, which is performed by using the sampling device shown in fig. 1 and includes:
firstly, the whole set of device air path is vacuumized, and then the whole set of device air path is connected to an air taking/recharging port of the switch device through the first electromagnetic valve 1, and the first electromagnetic valve 1, the second electromagnetic valve 3, the third electromagnetic valve 5, the fourth electromagnetic valve 9 and the fifth electromagnetic valve 10 are in a closed state when the device is not electrified. The starting device power detects each function and gas detecting element 2, whether the 7 signal value of pressure sensor is normal, after normal, at first open first solenoid valve 1, then open fourth solenoid valve 9, second solenoid valve 3, third solenoid valve 5, let the interior gas sample of switchgear along first solenoid valve 1, fourth solenoid valve 9, gas detecting element 2, second solenoid valve 3, 5 gas circuits of third solenoid valve flow into the gas holder, observe the pressure sensor signal value, after its pressure value is the same with the interior gas pressure value of switchgear, accomplish and get the gas flow.
Starting the detection function of the gas detection unit 2, and after the detection of the decomposition product of the gas sample is finished, entering the following gas refilling process:
firstly, the second electromagnetic valve 3 is closed, the stepping motor 42 is started to pull the linkage rod of the piston cylinder 41, gas in the gas storage tank is pumped into the piston cylinder 41, then the third electromagnetic valve 5 is closed, the second electromagnetic valve 3 is opened, the stepping motor 42 is started to push the linkage rod of the piston cylinder 41, and the gas in the piston cylinder 41 is pressed back into the switch device along the gas path of the second electromagnetic valve 3, the gas detection unit 2, the fourth electromagnetic valve 9 and the first electromagnetic valve 1, so that a gas back-filling process is completed. Repeating the gas refilling process for a plurality of times, stopping refilling until the pressure sensor detects that the gas pressure value in the gas storage tank is reduced to 0.001Mpa, and filling the gas sample in the gas storage tank back to the switch device so as to enter the following residual gas emptying process:
firstly, the first electromagnetic valve 1 is closed, the fifth electromagnetic valve 10 is started, the air pump 8 is started to pump the residual gas sample in the air path for 1 minute, and the evacuation process is completed. The whole operation process is completed.
And waiting for the controller to send out a sampling detection instruction again, and repeatedly executing the sampling, recharging and emptying processes.
In summary, the sampling device provided by the present embodiment has the following technical advantages compared with the prior art:
(1) the gas decomposition product detection means is upgraded from an off-line detection mode to an on-line monitoring mode, so that the real-time performance and the data reliability of detection are improved;
(2) other gas index on-line monitoring systems (such as gas humidity and density) detect static gas samples, the gas samples are not extracted from the equipment body, so that the gas samples measured each time are all gas in a pipeline and cannot effectively reflect gas indexes in the switchgear;
(3) after the device technology is used, more than 95% of gas samples can be filled back into the switch equipment after the gas on-line monitoring system is detected every time, so that the gas is reduced to the maximum extent.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A reciprocating gas storage type sulfur hexafluoride gas online sampling device is used for electromagnetic valve equipment and is characterized by comprising a first electromagnetic valve, a gas detection unit, a second electromagnetic valve, a gas pumping and charging unit, a third electromagnetic valve, a gas storage unit and a controller;
the first electromagnetic valve, the gas detection unit, the second electromagnetic valve and the gas pumping and inflating unit are sequentially connected to form a main gas circuit;
one port of the third electromagnetic valve is connected to the pipeline between the second electromagnetic valve and the air pumping and inflating unit, and the other port of the third electromagnetic valve is connected with the air storage unit to form a branch air path;
the controller is respectively connected with the first electromagnetic valve, the gas detection unit, the second electromagnetic valve, the gas pumping unit and the third electromagnetic valve in a signal mode and used for controlling the first electromagnetic valve, the gas detection unit, the second electromagnetic valve, the gas pumping unit and the third electromagnetic valve to work.
2. The on-line sampling device for sulfur hexafluoride gas storage as recited in claim 1, further comprising a suction pump connected to the main gas path or the branch gas paths, the operation of the suction pump being controlled by the controller.
3. The on-line sampling device for sulfur hexafluoride gas storage as recited in claim 1, wherein a fourth solenoid valve is further disposed in the conduit between the first solenoid valve and the gas detection unit, and the operation of the fourth solenoid valve is controlled by the controller.
4. The on-line sampling device for sulfur hexafluoride gas storage as recited in claim 3, further comprising a pump connected in the conduit between the first solenoid valve and the fourth solenoid valve, the pump being controlled by the controller.
5. The device for on-line sampling of sulfur hexafluoride gas stored in one of claims 1 and 4, further comprising a pressure sensor for monitoring the pressure of the gas in the main gas path or the branch gas paths and transmitting the monitored pressure of the gas to the controller, wherein the controller issues a control command according to the monitored pressure of the gas.
6. The on-line sampling device for sulfur hexafluoride gas storage as recited in claim 5 wherein said pressure sensor is located in the conduit between the third electromagnetic and gas storage units.
7. The round-trip gas storage type sulfur hexafluoride gas online sampling device as recited in claim 6, wherein the gas pumping and charging unit comprises a piston cylinder and a stepping motor, and the stepping motor is used for pushing and pulling a linkage rod of the piston cylinder so as to realize gas pumping or charging of the main gas path or the branch gas path of the piston cylinder.
8. The on-line sampling device for sulfur hexafluoride gas storage as recited in claim 4, wherein the gas outlet of said pump is connected to the gas outlet; a fifth electromagnetic valve is arranged in a pipeline between the air outlet and the air outlet of the air pump, and the operation of the fifth electromagnetic valve is controlled by the controller.
9. The round-trip gas storage sulfur hexafluoride gas on-line sampling device of claim 1, wherein said gas storage unit is a gas storage tank.
10. An on-line sampling method for sulfur hexafluoride gas stored in a reciprocating manner, which is carried out by using the sampling device of claim 7, and comprises the following steps:
firstly, vacuumizing the gas path of the whole device, connecting a first electromagnetic valve to a gas taking/recharging port of the switch device, detecting whether the signal values of a gas detection unit and a pressure sensor are normal, starting the first electromagnetic valve after the signal values are normal, then starting a second electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, allowing a gas sample in the switch device to flow into a gas storage unit, observing the signal value of the pressure sensor, and finishing a gas taking process after the pressure value of the pressure sensor is the same as the gas pressure value in the switch device;
starting a detection function of the gas detection unit, and after the detection of the decomposition product of the gas sample is finished, entering the following gas refilling process:
firstly, closing a second electromagnetic valve, starting a stepping motor to pull a piston cylinder linkage rod, pumping gas in a gas storage unit into a piston cylinder, then closing a third electromagnetic valve, opening the second electromagnetic valve, starting the stepping motor to push the piston cylinder linkage rod, and pressing gas in the cylinder back into the switch equipment along the gas path of the second electromagnetic valve, a gas detection unit, a fourth electromagnetic valve and a first electromagnetic valve, thus finishing a gas back-filling process;
repeating the gas refilling process for multiple times, stopping refilling until the pressure sensor detects that the gas pressure value in the gas storage tank is reduced to a set value, so that the gas sample in the gas storage tank is filled back into the switch device, and entering the following residual gas emptying process:
the first electromagnetic valve is closed, the fifth electromagnetic valve is started, the air pump is started to pump residual gas samples in the air path, the evacuation process is completed, and the whole operation process is completed.
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| CN109270225A (en) * | 2018-11-20 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | The method and device of carbon tetrafluoride content in a kind of detection electrical equipment |
| CN209264659U (en) * | 2018-11-06 | 2019-08-16 | 广州供电局有限公司 | Sampling device |
| CN110779777A (en) * | 2019-11-07 | 2020-02-11 | 国网安徽省电力有限公司电力科学研究院 | Sulfur hexafluoride gas online sampling system |
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2020
- 2020-08-13 CN CN202010812791.3A patent/CN112033767A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209264659U (en) * | 2018-11-06 | 2019-08-16 | 广州供电局有限公司 | Sampling device |
| CN109270225A (en) * | 2018-11-20 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | The method and device of carbon tetrafluoride content in a kind of detection electrical equipment |
| CN110779777A (en) * | 2019-11-07 | 2020-02-11 | 国网安徽省电力有限公司电力科学研究院 | Sulfur hexafluoride gas online sampling system |
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