CN110954656A - Gaseous detection refilling device of SF6 switch - Google Patents

Gaseous detection refilling device of SF6 switch Download PDF

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Publication number
CN110954656A
CN110954656A CN201911142555.9A CN201911142555A CN110954656A CN 110954656 A CN110954656 A CN 110954656A CN 201911142555 A CN201911142555 A CN 201911142555A CN 110954656 A CN110954656 A CN 110954656A
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Prior art keywords
module
gas
valve
recharging
switch
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Pending
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CN201911142555.9A
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Chinese (zh)
Inventor
蒋延磊
王晓超
王莹秋
高琳翔
钱红娟
贾延甫
王燕霞
许岚
李闯
贾振强
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Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
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Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
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Priority to CN201911142555.9A priority Critical patent/CN110954656A/en
Publication of CN110954656A publication Critical patent/CN110954656A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0031General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention belongs to the technical field of detection of electrical equipment and relates to a SF6 switch gas detection recharging device. The device comprises a pretreatment module, a measurement module, a gas recharging module and a control display module; one end of the pretreatment module is connected with an SF6 switch equipment air chamber through a sampling air pipe, and the other end of the pretreatment module is connected with the measurement module through the sampling air pipe to convey sampling air to the measurement module; the measuring module detects moisture and decomposition products of the sampled gas and transmits the moisture and decomposition products to the gas recharging module; the gas recharging module stores the measured gas back in a storage tank of the gas recharging module and replenishes the SF6 switch equipment with the gas; and controlling the display module to perform flow control, data acquisition and data remote transmission processing. The device can not only realize SF6Detecting gas purity, moisture, and decomposition product, and passing gas through measuring moduleTemporarily store in the buffer memory jar of recharging module behind the piece, once only recharge to the circuit breaker after the measurement.

Description

Gaseous detection refilling device of SF6 switch
Technical Field
The invention belongs to the technical field of detection of electrical equipment, and particularly relates to a SF6 switch gas detection recharging device.
Background
With the continuous improvement of the power supply reliability of the power system, GIS/HGIS, SF6The usage amount of equipment such as circuit breakers and the like is continuously increased, and SF is required according to the requirements of DL/T595 gas supervision and guidance for Sulfur hexafluoride electric Equipment (SOF) and Q/GDW168-2008 State maintenance and testing procedures for Power Transmission and transformation Equipment (SF)6The switch equipment is subjected to periodic detection tests according to standards so as to ensure safe and stable operation of the switch equipment. SF6In testing of switching gases, e.g. 10kV HD4Form SF6The gas in the upper and lower gas chambers of the circuit breaker is only 0.272kg, and the gas flows out through the existing detection equipment in the detection process, so that the gas pressure in the gas chambers is easily reduced, and the safe operation of the equipment is influenced. Meanwhile, the emission of gas is accumulated in a day and month, which not only causes SF6The waste of gas also causes greenhouse effect. The prior SF6 gas recovery device is mainly suitable for SF6In the major repair and technical improvement of equipment, the complete recovery of gas can be ensured, and the daily SF can not be met6The switchgear periodically detects the test requirements.
Research shows that for detecting sulfur hexafluoride gas (SF 6) gas insulation equipment, a method for detecting sulfur hexafluoride gas decomposition products is adopted at present. The method generally detects latent fault diagnosis such as insulation along surface defect of equipment, connection defect between conductors in the equipment, abnormal heating in the equipment, abnormal ablation of parts in an arc extinguishing chamber and the like, and GIS fault location. The method for detecting the sulfur hexafluoride gas decomposition products has the advantages of small interference from the external environment, high sensitivity, good accuracy and the like, and becomes a new technology and an effective means for monitoring the state of the operating equipment and diagnosing faults. However, most of the existing SF6 gas decomposition product detectors used on site adopt an off-line method, and need to sample to a laboratory for detection or personnel on-site detection (the on-site detection period is long), and the conditions of electrical equipment cannot be reflected in time or in real time. In addition, due to the fact that off-line detection is adopted, sampling or sample gas extraction is needed in the detection process, certain gas release effect can be caused to sulfur hexafluoride high-voltage equipment, the gas release amount has a direct relation with the detection times and time, the adverse effect of pressure reduction of a high-voltage switch equipment body can be caused, and normal operation of the equipment is affected. Moreover, the sampling gas or the detection gas during detection is directly exhausted, and the exhausted air can cause greenhouse effect to the ecological environment for human survival (sulfur hexafluoride gas is a gas with strong greenhouse effect, and the greenhouse effect is 23900 times of that of equivalent carbon dioxide), so that the pollution and the damage to the survival environment are caused, and meanwhile, the harm to the health and even the life of the maintainer is caused (decomposition products contain some strongly corrosive and extremely toxic substances).
Patent document No. CN 203479582U discloses an on-line sampling and measuring device for high-voltage switch SF6 gas decomposition products, which extracts a sample in sulfur hexafluoride equipment through a sampling gas path, conveys the extracted sample to an on-line detection and recovery gas path, detects various parameter indexes of the sample in the gas path, sends a detection result to a remote centralized control center through an on-site industrial personal computer, and recovers redundant gas through a recovery device after detection is finished, thereby preventing environmental pollution and affecting the health of on-site workers; secondly, carry out gas supplementation to check out test set through return gas circuit, guarantee the normal operating of equipment, reduce the equipment loss. The equipment can not recycle the sampled gas in time, thereby causing waste and environmental pollution.
The patent document with the publication number of CN 203894243U discloses an automatic online sampling detection device for sulfur hexafluoride, which comprises a controller, a gas sampling unit and an SF6 comprehensive analyzer, wherein the controller is connected with the SF6 comprehensive analyzer, the gas sampling unit comprises a cylinder, a gas pump, a vacuum generator and a flow valve, the gas inlet end of the SF6 comprehensive analyzer is connected with a gas sample bottle through a gas inlet pipeline and the flow valve, the gas outlet end of the SF6 comprehensive analyzer is connected with the cylinder through a gas outlet pipeline to form a detection gas circuit, the cylinder and the vacuum generator are connected in parallel and then connected with the gas pump, the gas inlet pipeline is communicated with the gas outlet pipeline, the gas outlet pipeline is connected with the vacuum generator through a branch pipeline to form a pipeline evacuation, and a gas return and charge circuit is formed between the gas inlet pipeline and the gas outlet pipeline. The device has low safety, and is easy to leak and pollute the environment.
Based on the above situation, in combination with SF6The actual requirement of switch gas detection is developed by developing an SF6The switch gas detection recharging device is significant.
Disclosure of Invention
The invention aims to provide an SF6 switch gas detection recharging device aiming at the problems in the prior art, which can not only realize SF6Gas purity, moisture, decomposition detect, but also can with gas process measuring module back keep in fill the buffer memory jar of module back, fill the system with qualified SF by the back after the measurement6Gas is recharged to the breaker once again, and complete closed-loop processing is realized, so that the whole test process is more standardized and standardized, and the power supply reliability of equipment is ensured.
The technical scheme of the invention is as follows:
a gas detection and recharging device for an SF6 switch comprises a preprocessing module, a measuring module, a gas recharging module and a control display module;
one end of the pretreatment module is connected with an SF6 switch equipment air chamber through a sampling air pipe, and the other end of the pretreatment module is connected with the measurement module through the sampling air pipe to convey sampling air to the measurement module;
the measuring module detects moisture and decomposition products of the sampled gas and transmits the moisture and decomposition products to the gas recharging module;
the gas recharging module stores the measured gas back in a storage tank of the gas recharging module and replenishes the SF6 switch equipment with the gas;
the control display module is respectively connected with the preprocessing module, the measuring module and the gas recharging module, and is used for carrying out flow control, data acquisition and data remote transmission processing on the preprocessing module, the measuring module and the gas recharging module.
Specifically, the preprocessing module including set gradually first solenoid valve, second solenoid valve, first control valve and the first relay on the sample trachea, first solenoid valve and second solenoid valve between be provided with the relief pressure valve, first control valve and first relay between be provided with pressure sensor, the sample trachea connect SF6 switchgear's the gas port of getting, first solenoid valve, relief pressure valve, second solenoid valve, first control valve, pressure sensor and first relay be connected with control display module simultaneously.
Specifically, a third electromagnetic valve is arranged between the pressure sensor and the first relay, a second control valve is connected in parallel between the second electromagnetic valve and the third electromagnetic valve, and the second control valve and the third electromagnetic valve are simultaneously connected with the control display module.
Specifically, the measuring module comprises a decomposer detector, a micro water density meter and a flow measuring instrument.
Specifically, gaseous back charge module include the one-level air pump of being connected with measuring module, the one-level air pump be connected with second grade buffer tank, second grade buffer tank export be provided with second grade air pump and fourth solenoid valve, fourth solenoid valve be connected with third control valve, third control valve one end pass through second check valve and sample trachea intercommunication, the third control valve other end be connected with the second relay, the second relay connect first check valve, second grade air pump export set up between third control valve and second check valve, one-level air pump, second grade air pump, fourth solenoid valve, first check valve, third control valve, second check valve, second relay be connected with control display module simultaneously.
Specifically, the control display module comprises a PLC controller and a touch screen of a human-computer interface, and the touch screen is connected with the controller and used for giving instructions to the controller and receiving information fed back by the controller.
Sulfur hexafluoride gas is widely used in high-voltage electrical equipment because of its excellent arc extinguishing properties. However, after the device is operated, due to the discharge and the action of high temperature and high pressure during operation, the gas is decomposed into a series of low fluoride with high toxicity, such as SO2, SH2, SOF2 and the like, and when the gas leaks into the air, the gas easily threatens the human body. The existing sulfur hexafluoride detection method is to lead gas from a gas charging port of a sulfur hexafluoride breaker to a special testing instrument regularly, the instrument is used for detecting related parameters such as purity, humidity and the like of the gas, and the off-line detection mode is poor in detection real-time performance, complex in operation process of the detection method and incapable of reflecting conditions in equipment in real time. Therefore, the development of sulfur hexafluoride online sampling detection devices is necessary. At present, the existing sulfur hexafluoride content online monitoring device can realize automatic gas sampling and automatic detection, but the sampling gas or the detection gas during detection is directly emptied, and the air discharge body can cause greenhouse effect to the ecological environment of human existence (sulfur hexafluoride gas is a gas with strong greenhouse effect and 23900 times of equivalent carbon dioxide), so that the harm to the health and even the life of maintainers (decomposition products contain some strong corrosive and extremely toxic substances) is caused while the pollution and the damage to the environment are caused.
The invention has the beneficial effects that: the device includes preprocessing module, measuring module, gaseous module, the control display module that recharges, and preprocessing module takes a sample and will take a sample gas to send to measuring module from SF6 switchgear air chamber (circuit breaker), measuring module detect sample gas's moisture, decomposition thing to carry to gaseous module of recharging, gaseous module of recharging is with the gaseous storage tank of storing in gaseous module of recharging of measuring back to simultaneously for SF6 switchgear make-up gas. Device for measuring the position of a moving objectEach component adopts high leakproofness spare part, integrates the module and handles, and connecting line integration welding process reduces and leaks the risk. Simultaneously, each module is subjected to sealing treatment and is filled with SF6The invention has the advantages of simple and compact structure, good reliability, humanized and intelligent operation, high automation degree, complete functions and the like, improves the working environment of sulfur hexafluoride gas sampling detection, realizes the automation of the monitoring process, saves energy, protects environment and reduces the pollution of the sulfur hexafluoride gas to the atmosphere.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
The device comprises a first electromagnetic valve 1, a pressure reducing valve 2, a second electromagnetic valve 3, a first control valve 4, a second control valve 5, a pressure sensor 6, a third electromagnetic valve 7, a first relay 8, a measuring module 9, a second-level cache tank 10, a second-level air pump 11, a fourth electromagnetic valve 12, a first check valve 13, a third control valve 14, a second check valve 15, a second relay 16, a first-level air pump 17, an air measuring port 18, a preprocessing module 19 and a gas recharging module 20.
Detailed Description
Fig. 1 is a schematic block diagram of an SF6 switch gas detection recharging device of the present invention, which includes a preprocessing module 19, a measuring module 9, a gas recharging module 20, and a control display module, and fig. 2 is a schematic structural diagram of the present invention.
One end of the pretreatment module 19 is connected with an SF6 switch equipment air chamber through a sampling air pipe, the other end of the pretreatment module 19 is connected with the measurement module 9 through the sampling air pipe to convey sampling air to the measurement module 9, in order to reduce the air consumption during system measurement and gas washing, 3mm stainless steel pipes can be adopted for connection from the switch air chamber to the pretreatment module and the interior of the system (assuming that the total length of an integral air path from a sampling pipeline to the interior is 20m, the integral volume is considered, more redundancy is considered, the integral volume is about 200mL, the integral volume of the equipment is smaller, and the air is not lost when returning to the equipment, the pretreatment module 19 comprises a first electromagnetic valve 1, a second electromagnetic valve 3, a first control valve 4 and a first relay 8 which are sequentially arranged on the sampling air pipe, a pressure reducing valve 2 is arranged between the first electromagnetic valve 1 and the second electromagnetic valve 3, and a pressure sensor 6 is arranged between the first control valve 4 and, sample trachea connect SF6 switchgear's gas taking port, first solenoid valve 1, relief pressure valve 2, second solenoid valve 3, first control valve 4, pressure sensor 6 and first relay 8 be connected with control display module simultaneously, pressure sensor 6 and first relay 8 between be provided with third solenoid valve 7, second solenoid valve 3 and third solenoid valve 7 between parallel connection second control valve 5, second control valve 5 and third solenoid valve 7 be connected with control display module simultaneously. .
The measurement module 9 detects moisture and decomposition products of the sampled gas and transmits the moisture and decomposition products to the gas recharging module 20, and the measurement module 9 comprises a decomposition product detector, a micro water density meter and a flow measuring instrument.
The gas recharging module 20 stores the measured gas back in the storage tank of the gas recharging module and also replenishes the SF6 switchgear with gas. The gas refilling module 20 comprises a first-level air pump 17 connected with the measuring module, the first-level air pump 17 is connected with a second-level cache tank 10, a second-level air pump 11 and a fourth electromagnetic valve 12 are arranged at the outlet of the second-level cache tank 10, the fourth electromagnetic valve 12 is connected with a third control valve 14, one end of the third control valve 14 is communicated with the sampling air pipe through a second one-way valve 15, the other end of the third control valve 14 is connected with a second relay 16, the second relay 16 is connected with a first one-way valve 13, the outlet of the second-level air pump 11 is arranged between the third control valve 14 and the second one-way valve 15, and the first-level air pump 17, the second-level air pump 11, the fourth electromagnetic valve 12, the first one-way valve 13, the third control valve 14, the second one-way valve 15 and the second relay 16 are simultaneously connected with the control display module.
The control display module is respectively connected with the preprocessing module 19, the measuring module 9 and the gas recharging module 20, and is used for carrying out flow control, data acquisition and data remote transmission processing on the preprocessing module 19, the measuring module 9 and the gas recharging module 20. The control display module comprises a PLC controller and a touch screen of a human-computer interface, and the touch screen is connected with the controller and used for giving instructions to the controller and receiving information fed back by the controller.
The process of gas detection and recharging by using the SF6 switch gas detection recharging device provided by the invention comprises the following steps: the first step is to use the SF provided by the invention6Switch gas detects that backfill device surveys gas port 18 with SF6 switchgear air chamber and reliably connects, presses the key of opening the machine of control display module, starts preprocessing module 19, and first solenoid valve 1, second solenoid valve 3, third solenoid valve 7, fourth solenoid valve 12, third control valve 14, first check valve 13, first relay 8, second relay 16 open, makes the sample gas flow through the pipeline in proper order, realizes sweeping of system's pipeline air, moisture, the first exhaust stage promptly, relief pressure valve 2, first control valve 4, second control valve 5 realize steady voltage, the stationary flow function, pressure sensor 6 to gas pressure real-time supervision, realize the ordinary pressure measurement, guarantee measuring module's reliable, steady operation.
Secondly, starting the measuring module 9, wherein the measuring module 9 comprises a decomposer detector, a micro water density meter and a process measuring instrument and can simultaneously realize SF6The switch samples the detection of the purity, moisture and decomposition products of the gas, and sends the detection data to the control display module 20, and the detection data is stored and displayed in real time, so that the detection is convenient to check.
And thirdly, after the gas passes through the measurement module, the gas is automatically and temporarily stored in a second-level cache tank 10 of the gas recharging module through a first-level gas pump 17, and is then recharged to an SF6 switch equipment gas chamber at one time through a gas recharging module 20 after the measurement is finished.
Fourthly, after the measurement is finished and the gas index is qualified, the second-stage air pump 11 is started to refill the gas in the second-stage cache tank 10 to the gas chamber of the SF6 switch equipment at one time, so that the SF is prevented from being generated6Gas flows into the atmosphere to ensure SF6The pressure of the switch air chamber is stable.
And fifthly, finishing the measurement after the gas refilling is finished, repeating all the stages if the measurement point is replaced, finishing the measurement work of a new measurement point, and directly circulating the measurement and the gas refilling stages if the current measurement point is repeatedly detected.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (6)

1. The SF6 switch gas detection recharging device is characterized by comprising a preprocessing module (19), a measuring module (9), a gas recharging module (20) and a control display module;
one end of the pretreatment module (19) is connected with an SF6 switch equipment air chamber through a sampling air pipe, and the other end of the pretreatment module is connected with the measurement module (9) through the sampling air pipe to convey sampling air to the measurement module (9);
the measuring module (9) detects moisture and decomposition products of the sampled gas and transmits the moisture and decomposition products to the gas recharging module (20);
the gas recharging module (20) stores the measured gas back in a storage tank of the gas recharging module and replenishes the SF6 switch equipment with the gas;
the control display module is respectively connected with the preprocessing module (19), the measuring module (9) and the gas recharging module (20), and the preprocessing module (19), the measuring module (9) and the gas recharging module (20) are subjected to flow control, data acquisition and data remote transmission processing.
2. The SF6 switch gas detection and recharging device of claim 1, wherein the preprocessing module (19) includes a first solenoid valve (1), a second solenoid valve (3), a first control valve (4) and a first relay (8) sequentially installed on a sampling gas pipe, a pressure reducing valve (2) is installed between the first solenoid valve (1) and the second solenoid valve (3), a pressure sensor (6) is installed between the first control valve (4) and the first relay (8), the sampling gas pipe is connected to a gas intake of an SF6 switch device, and the first solenoid valve (1), the pressure reducing valve (2), the second solenoid valve (3), the first control valve (4), the pressure sensor (6) and the first relay (8) are simultaneously connected to the control display module.
3. An SF6 switch gas detection recharging device according to claim 2, wherein a third solenoid valve (7) is arranged between the pressure sensor (6) and the first relay (8), a second control valve (5) is connected in parallel between the second solenoid valve (3) and the third solenoid valve (7), and the second control valve (5) and the third solenoid valve (7) are simultaneously connected with a control display module.
4. The SF6 switch gas detection and refill device of claim 1, wherein the measurement module (9) comprises a analyte detector, a micro water density meter and a process meter.
5. The SF6 switch gas detection recharging device of claim 1, wherein the gas recharging module (20) comprises a first stage air pump (17) connected to the measuring module, the first stage air pump (17) is connected to a second stage buffer tank (10), a second stage air pump (11) and a fourth solenoid valve (12) are provided at an outlet of the second stage buffer tank (10), the fourth solenoid valve (12) is connected to a third control valve (14), one end of the third control valve (14) is connected to the sampling air pipe through a second check valve (15), the other end of the third control valve (14) is connected to a second relay (16), the second relay (16) is connected to a first check valve (13), an outlet of the second stage air pump (11) is provided between the third control valve (14) and the second check valve (15), the first stage air pump (17), The two-stage air pump (11), the fourth electromagnetic valve (12), the first check valve (13), the third control valve (14), the second check valve (15) and the second relay (16) are simultaneously connected with the control display module.
6. The SF6 switch gas detection and recharge device of claim 1, wherein the control display module comprises a PLC controller and a touch screen of a human-machine interface, the touch screen is connected to the controller and is configured to give commands to the controller and receive information fed back from the controller.
CN201911142555.9A 2019-11-20 2019-11-20 Gaseous detection refilling device of SF6 switch Pending CN110954656A (en)

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