CN110349375A - A kind of SF6 electrical equipment gas leakage alarming system - Google Patents
A kind of SF6 electrical equipment gas leakage alarming system Download PDFInfo
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- CN110349375A CN110349375A CN201910764477.XA CN201910764477A CN110349375A CN 110349375 A CN110349375 A CN 110349375A CN 201910764477 A CN201910764477 A CN 201910764477A CN 110349375 A CN110349375 A CN 110349375A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
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Abstract
The present invention proposes a kind of SF6 electrical equipment gas leakage alarming system, including processor, SF6 detection module, power supply module, communication module, display module, alarm module, wherein, the output end of SF6 detection module and the input terminal of processor connect, and processor is connect with communication module, display module, alarm module；Power supply module is powered to processor, SF6 detection module, communication module, display module respectively by connecting with processor；SF6 detection module includes SF6 concentration tester, oxygen concentration tester.SF6 concentration, oxygen concentration data in SF6 detection module real-time detection SF6 electrical equipment, it is subsequently sent to be judged in processor, and data transmission collected is shown into display module, when processor judges two kinds of gas concentrations collected while being more than its preset secure threshold, then judging result and acquisition data is realized by the communication terminal that communication module is sent to staff and alarmed.
Description
Technical field
The present invention relates to power equipment auxiliary device technical fields, let out more particularly, to a kind of SF6 electrical equipment gas
Leak alarm system.
Background technique
With the continuous development of electric system, SF6 electrical equipment has easy for installation, operation peace using more and more extensive
The advantages that complete reliable, easy to maintenance.SF6 electrical equipment is generally used in GIS electrical room, and wherein SF6 gas is as exhausted
Edge gas, for breaker, disconnecting switch, earthing switch, mutual inductor, arrester, bus, casing and cable termination etc. is electrical
Element closing combination is in the metal shell of ground connection.
However, in electric system application, since service life is too long, usage mode is incorrect or the interference of external animal,
There are the security risks that gas leaks for SF6 power equipment, and when SF6 gas leaks and in low layer Spatial Agglomeration to a certain concentration
When, cerebral anoxia can occur for the staff of unknown situation, or even the quickly serious personal safety accident such as asphyxia.Currently, electric power
Generally the concentration of SF6 inside electric appliance is detected using SF6 concentration alarm in system application, but can only be realized in electricity
Gas equipment concentration inside is just alarmed when being more than secure threshold, if the secure threshold of setting is excessively high, when staff is to SF6
It is big that there are work difficulties when electrical equipment is safeguarded, and still there are problems that some potential safety problems in maintenance process；Such as
The secure threshold of fruit setting is too low, it is likely that generates wrong report, increases the workload of staff, waste of manpower resource.
Summary of the invention
The present invention is the defect for overcoming SF6 concentration alarm described in the above-mentioned prior art to be easy to produce wrong report, provides one
Kind SF6 electrical equipment gas leakage alarming system is improved by detecting SF6 concentration and oxygen concentration in power equipment simultaneously
Its accuracy rate detected.
In order to solve the above technical problems, technical scheme is as follows:
A kind of SF6 electrical equipment gas leakage alarming system, including processor, SF6 detection module, power supply module, communication
Module, display module, alarm module, wherein the input terminal of the output end of SF6 detection module and processor connects, processor with
Communication module, display module, alarm module connection；Power supply module is detected to processor, SF6 respectively by connecting with processor
Module, communication module, display module are powered；SF6 detection module includes SF6 concentration tester, oxygen concentration tester.
SF6 concentration, oxygen concentration number in the technical program, in SF6 detection module difference real-time detection SF6 electrical equipment
According to, be subsequently sent to be analyzed and processed in processor, and by SF6 concentration collected, oxygen concentration data transmission to display
It is shown in module；When processor judges in SF6 electrical equipment that SF6 concentration data is higher than preset SF6 secure threshold, simultaneously
When oxygen concentration data are lower than preset oxygen alarm threshold, then judging result and acquisition data are sent out by the communication module
The communication terminal for being sent to staff realizes alarm.
Preferably, power supply module includes solar panels, battery group, lithium battery, wherein the output end and storage of solar panels
The charging end of battery pack connects, and the output end of lithium battery is connect with the charging end of battery group, the output end conduct of battery group
The output end of power supply module and the feeder ear of processor connect.
Preferably, communication module includes at least one of GPRS module, EDGE module, 3G module, SMS module.
Preferably, display module includes LED display or LCD display.
Preferably, alarm module includes at least one of buzzer, alarm lamp.
Preferably, system further includes for reducing the blower of SF6 gas concentration in SF6 electrical equipment, wherein blower and place
Manage device connection；When processor judges in SF6 electrical equipment that SF6 concentration data is higher than preset SF6 secure threshold, while oxygen is dense
When degree is according to preset oxygen alarm threshold is lower than, processor sends electric signal to the blower, and blower is connected and works.
Preferably, system further includes scarer, wherein scarer includes for detecting whether close red of animal
Outer detection sensor and ultrasonic transducer for driving close animal, the output end and processor of infrared detection sensor
Input terminal connection, processor according to the data of infrared detection sensor judge whether there is biology it is close, if so, processor to
Ultrasonic transducer sends electric signal, and ultrasonic transducer is connected and works.
Compared with prior art, the beneficial effect of technical solution of the present invention is: by and meanwhile detect in SF6 electrical equipment
SF6 gas concentration and oxygen concentration simultaneously carry out analytical judgment processing, further increase the standard of SF6 electrical equipment Leakage inspection
True rate；The blower pneumatically added when the SF6 excessive concentration in power equipment, can be effectively reduced the maintenance work of staff
Difficulty；By the scarer added, interference of the external animal to power equipment can effectively avoid, it is electrical to reduce SF6 from source
A possibility that equipment gas leaks.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the SF6 electrical equipment gas leakage alarming system of embodiment 1.
Fig. 2 is the structural schematic diagram of the SF6 electrical equipment gas leakage alarming system of embodiment 2.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, the structural schematic diagram of the SF6 electrical equipment gas leakage alarming system for the present embodiment.
The present embodiment proposes a kind of SF6 electrical equipment gas leakage alarming system, including processor 1, SF6 detection module 2,
Power supply module 3, communication module 4, display module 5, alarm module 6, blower 7, wherein the output end of SF6 detection module 2 and processing
The input terminal of device 1 connects, and processor 1 is connect with communication module 4, display module 5, alarm module 6；Power supply module 3 by with place
It manages device 1 to connect, be powered respectively to processor 1, SF6 detection module 2, communication module 4, display module 5.
In the present embodiment, SF6 detection module 2 includes SF6 concentration tester 21, oxygen concentration tester 22, wherein SF6
Concentration tester 21 is used to detect the SF6 gas concentration in SF6 electrical equipment, and oxygen concentration tester 22 is for detecting SF6 electricity
Oxygen concentration in gas equipment, SF6 concentration tester 21 and the gas concentration data collected of oxygen concentration tester 22 difference
It is transmitted in processor 1 and is analyzed and processed.
In the present embodiment, power supply module 3 includes solar panels 31, battery group 32, lithium battery 33, wherein solar panels 31
Output end connect with the charging end of battery group 32, the output end of lithium battery 33 is connect with the charging end of battery group 32, store
The output end of battery pack 32 is connect as the output end of power supply module 3 with the feeder ear of processor 1.
In the present embodiment, communication module 4 include GPRS module, processor 1 to communication module 4 send gas concentration data and
In the communication terminal for the staff that alarm signal is sent in same local area network by its GPRS module, guarantee and SF6 electricity
The nearest staff of power equipment can obtain alarm signal in time and repair in time to SF6 power equipment.
In the present embodiment, display module 5 includes LED display, and alarm module 6 includes buzzer 61 and alarm lamp 62.
In the present embodiment, blower 7 is connect with processor 1；When processor 1 judges that SF6 concentration data is high in SF6 electrical equipment
In preset SF6 secure threshold, while when oxygen concentration data are lower than preset oxygen alarm threshold, processor 1 is sent out to blower 7
Electric signals, blower 7 are connected and work.
In the specific implementation process, SF6 gas concentration secure threshold and oxygen concentration safety threshold are preset in processor 1
Value, SF6 detection module 2 pass through oxygen by the SF6 gas concentration in 21 real-time detection SF6 electrical equipment of F6 concentration tester
Oxygen concentration data in 22 real-time monitoring SF6 electrical equipment of concentration tester, the SF6 gas concentration data then acquired
It is separately sent to carry out logic judgment analysis processing in processor 1 with oxygen concentration data, while SF6 gas collected is dense
Degree evidence and oxygen concentration data are transmitted in display module 5 by processor 1 to be shown；If processor 1 judges current institute
The SF6 gas concentration data of acquisition are greater than preset SF6 gas concentration secure threshold, while current oxygen concentration number collected
According to preset oxygen concentration secure threshold is greater than, then same office is sent by communication module 4 by judging result and acquisition data
In the communication terminal of the staff of domain net, alarm is realized；Meanwhile processor 1 sends electric signal to alarm module 6, alerts mould
Buzzer 61 and alarm lamp 62 in block 6 are connected and work；Processor 1 sends electric signal to blower 7, and blower 7 is connected and works.
In the present embodiment, by detecting SF6 gas concentration in SF6 electrical equipment and oxygen concentration simultaneously and being analyzed
Judgement processing, further increases the accuracy rate of SF6 electrical equipment Leakage inspection；When the SF6 excessive concentration in power equipment
When the blower pneumatically added, can be effectively reduced the maintenance work difficulty of staff.
Embodiment 2
As shown in Fig. 2, the structural schematic diagram of the SF6 electrical equipment gas leakage alarming system for the present embodiment.
The present embodiment proposes a kind of SF6 electrical equipment gas leakage alarming system, including processor 1, SF6 detection module 2,
Power supply module 3, communication module 4, display module 5, alarm module 6, scarer 8, wherein the output end of SF6 detection module 2 with
The input terminal of processor 1 connects, and processor 1 is connect with communication module 4, display module 5, alarm module 6；Power supply module 3 passes through
It connect with processor 1, is powered respectively to processor 1, SF6 detection module 2, communication module 4, display module 5.SF6 detection
Module 2 includes SF6 concentration tester 21, oxygen concentration tester 22, wherein SF6 concentration tester 21 is electrical for detecting SF6
SF6 gas concentration in equipment, oxygen concentration tester 22 are used to detect the oxygen concentration in SF6 electrical equipment, and SF6 concentration is surveyed
Examination instrument 21 and the gas concentration data collected of oxygen concentration tester 22 are respectively transmitted to be analyzed and processed in processor 1.
Power supply module 3 includes solar panels 31, battery group 32, lithium battery 33, the wherein output end of solar panels 31 and battery group
32 charging end connection, the output end of lithium battery 33 are connect with the charging end of battery group 32, and the output end of battery group 32 is made
It is connect for the output end of power supply module 3 with the feeder ear of processor 1.Communication module 4 be GPRS module, processor 1 to communication mould
Block 4 sends gas concentration data and alarm signal is sent to the communication of the staff in same local area network by its GPRS module
In terminal, guarantee that the staff nearest with the SF6 power equipment can obtain alarm signal in time and set in time to SF6 electric power
It is standby to repair.
In the present embodiment, display module 5 includes LCD display, and alarm module 6 includes buzzer 61 and alarm lamp 62.
In the present embodiment, scarer 8 includes for detecting whether the close infrared detection sensor 81 of animal and using
In the ultrasonic transducer 82 for driving close animal, wherein the input of the output end and processor 1 of infrared detection sensor 81
End connection, it is close that processor 1 according to the data of infrared detection sensor 81 judges whether there is biology, if so, processor 1 is to super
Acoustic wave transducer 82 sends electric signal, and ultrasonic transducer 82 is connected and works.
In the specific implementation process, SF6 gas concentration secure threshold and oxygen concentration safety threshold are preset in processor 1
Value, SF6 detection module 2 pass through oxygen by the SF6 gas concentration in 21 real-time detection SF6 electrical equipment of F6 concentration tester
Oxygen concentration data in 22 real-time monitoring SF6 electrical equipment of concentration tester, the SF6 gas concentration data then acquired
It is separately sent to carry out logic judgment analysis processing in processor 1 with oxygen concentration data, while SF6 gas collected is dense
Degree evidence and oxygen concentration data are transmitted in display module 5 by processor 1 to be shown；If processor 1 judges current institute
The SF6 gas concentration data of acquisition are greater than preset SF6 gas concentration secure threshold, while current oxygen concentration number collected
According to preset oxygen concentration secure threshold is greater than, then same office is sent by communication module 4 by judging result and acquisition data
In the communication terminal of the staff of domain net, alarm is realized；Meanwhile processor 1 sends electric signal to alarm module 6, alerts mould
Buzzer 61 and alarm lamp 62 in block 6 are connected and work.In addition, scarer 8 operates simultaneously, wherein infrared acquisition sensing
The output end of device 81 is connect with the input terminal of processor 1, and processor 1 is judged whether there is according to the data of infrared detection sensor 81
Biology is close, if so, processor 1 sends electric signal to ultrasonic transducer 82, ultrasonic transducer 82 is connected and works.
In the present embodiment, by the scarer added, interference of the external animal to power equipment can effectively avoid, from source
Head reduces a possibility that SF6 electrical equipment gas leakage.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of SF6 electrical equipment gas leakage alarming system, it is characterised in that: including processor, SF6 detection module, power supply
Module, communication module, display module, alarm module, wherein the output end of the SF6 detection module and the input terminal of processor
Connection, the processor are connect with communication module, display module, alarm module；The power supply module by being connect with processor,
It is powered respectively to processor, SF6 detection module, communication module, display module；The SF6 detection module includes SF6 concentration
Tester, oxygen concentration tester；
SF6 concentration, oxygen concentration data in the SF6 detection module difference real-time detection SF6 electrical equipment, are subsequently sent to
It is analyzed and processed in processor, and SF6 concentration collected, oxygen concentration data transmission is shown into display module
Show；When the processor judges that SF6 concentration data is higher than preset SF6 secure threshold, while oxygen concentration in SF6 electrical equipment
When data are lower than preset oxygen alarm threshold, then work is sent by the communication module by judging result and acquisition data
The communication terminal of personnel realizes alarm.
2. SF6 electrical equipment gas leakage alarming system according to claim 1, it is characterised in that: the power supply module
Including solar panels, battery group, lithium battery, wherein the output end of the solar panels is connect with the charging end of battery group,
The output end of the lithium battery is connect with the charging end of battery group, and the output end of the battery group is as the defeated of power supply module
The connection of the feeder ear of outlet and processor.
3. SF6 electrical equipment gas leakage alarming system according to claim 1, it is characterised in that: the communication module
Including at least one of GPRS module, EDGE module, 3G module, SMS module.
4. SF6 electrical equipment gas leakage alarming system according to claim 1, it is characterised in that: the display module
Including LED display or LCD display.
5. SF6 electrical equipment gas leakage alarming system according to claim 1, it is characterised in that: the alarm module
Including at least one of buzzer, alarm lamp.
6. described in any item SF6 electrical equipment gas leakage alarming systems according to claim 1~5, it is characterised in that: described
System further includes blower, and the blower is connected to the processor；When the processor judges SF6 concentration in SF6 electrical equipment
Data be higher than preset SF6 secure threshold, while oxygen concentration data be lower than preset oxygen alarm threshold when, the processor
Electric signal is sent to the blower, the blower is connected and works.
7. described in any item SF6 electrical equipment gas leakage alarming systems according to claim 1~5, it is characterised in that: described
System further includes scarer, and the scarer includes infrared detection sensor and ultrasonic transducer, wherein described infrared
The output end of detection sensor is connect with the input terminal of the processor, and the processor is according to the data of infrared detection sensor
It is close to judge whether there is biology, if so, processor sends electric signal, the ultrasonic transducer conducting to ultrasonic transducer
Work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910764477.XA CN110349375A (en) | 2019-08-19 | 2019-08-19 | A kind of SF6 electrical equipment gas leakage alarming system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910764477.XA CN110349375A (en) | 2019-08-19 | 2019-08-19 | A kind of SF6 electrical equipment gas leakage alarming system |
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| CN110349375A true CN110349375A (en) | 2019-10-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061238A (en) * | 2019-12-26 | 2020-04-24 | 远景智能国际私人投资有限公司 | Production safety monitoring method, device, equipment and medium for lithium battery |
| CN113125074A (en) * | 2021-03-10 | 2021-07-16 | 河海大学 | Liquid leakage fault diagnosis method suitable for lithium ion battery |
| CN116858440A (en) * | 2023-09-05 | 2023-10-10 | 百穰新能源科技(深圳)有限公司 | Leakage detection method and device, leakage disposal method and device, and processing system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0425753A (en) * | 1990-05-22 | 1992-01-29 | Mitsubishi Electric Corp | Gas sensor |
| CN204258415U (en) * | 2014-11-21 | 2015-04-08 | 河海大学 | Assembled moving power supply |
| CN207476783U (en) * | 2017-11-28 | 2018-06-12 | 南京开天眼无人机科技有限公司 | A kind of bird repellent unmanned plane |
| CN108918454A (en) * | 2018-09-30 | 2018-11-30 | 江苏七塔电力科技有限公司 | Gas concentration detection apparatus and system |
| CN208270545U (en) * | 2018-10-12 | 2018-12-21 | 江苏峰工电气科技有限公司 | The leakage monitoring alarm system of electrical equipment gas medium |
-
2019
- 2019-08-19 CN CN201910764477.XA patent/CN110349375A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0425753A (en) * | 1990-05-22 | 1992-01-29 | Mitsubishi Electric Corp | Gas sensor |
| CN204258415U (en) * | 2014-11-21 | 2015-04-08 | 河海大学 | Assembled moving power supply |
| CN207476783U (en) * | 2017-11-28 | 2018-06-12 | 南京开天眼无人机科技有限公司 | A kind of bird repellent unmanned plane |
| CN108918454A (en) * | 2018-09-30 | 2018-11-30 | 江苏七塔电力科技有限公司 | Gas concentration detection apparatus and system |
| CN208270545U (en) * | 2018-10-12 | 2018-12-21 | 江苏峰工电气科技有限公司 | The leakage monitoring alarm system of electrical equipment gas medium |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061238A (en) * | 2019-12-26 | 2020-04-24 | 远景智能国际私人投资有限公司 | Production safety monitoring method, device, equipment and medium for lithium battery |
| CN111061238B (en) * | 2019-12-26 | 2024-01-05 | 远景智能国际私人投资有限公司 | Production safety monitoring method, device, equipment and medium for lithium battery |
| CN113125074A (en) * | 2021-03-10 | 2021-07-16 | 河海大学 | Liquid leakage fault diagnosis method suitable for lithium ion battery |
| CN113125074B (en) * | 2021-03-10 | 2022-03-11 | 河海大学 | Liquid leakage fault diagnosis method suitable for lithium ion battery |
| CN116858440A (en) * | 2023-09-05 | 2023-10-10 | 百穰新能源科技(深圳)有限公司 | Leakage detection method and device, leakage disposal method and device, and processing system |
| CN116858440B (en) * | 2023-09-05 | 2023-12-08 | 百穰新能源科技(深圳)有限公司 | Leakage detection method and device, leakage disposal method and device, and processing system |
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Application publication date: 20191018 |