CN107024672A - A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system - Google Patents
A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system Download PDFInfo
- Publication number
- CN107024672A CN107024672A CN201710283864.2A CN201710283864A CN107024672A CN 107024672 A CN107024672 A CN 107024672A CN 201710283864 A CN201710283864 A CN 201710283864A CN 107024672 A CN107024672 A CN 107024672A
- Authority
- CN
- China
- Prior art keywords
- line monitoring
- monitoring system
- measured value
- concentration
- gas concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system, on-line monitoring system is demarcated using standby demarcation mouth, and propose to demarcate postrun on-line monitoring system using least square method, the error that sensor is brought after a long time use can be reduced as far as possible, ensure later stage systems stay reliability of operation, this method is applied to the SO of operating sulfur hexafluoride electrical equipment current transformer and breaker2Content and purity on-line monitoring system, moisture, SO can be monitored simultaneously2On-line monitoring system, GIS optoacoustic spectroscopy decomposition components on-line monitoring systems and the SF of content and purity6Distributed on line monitoring system etc. is leaked, to overcome the deficiencies in the prior art.
Description
Technical field
The present invention relates to a kind of operation scaling method of on-line monitoring system, particularly a kind of SF6Insulation of electrical installation shape
The operation scaling method of state on-line monitoring system.
Background technology
The development of Adjoint technology, SF6Insulation of electrical installation state on_line monitoring system is increasingly popularized, all kinds
Sensor be used for monitor SF6Analyte content, SF in gas6Humidity and SF6Gas purity etc., however, all run at the scene
On-line monitoring system used in sensor (include infrared absorption, electrochemical sensor, resistance-capacitance type sensor and optoacoustic light
Spectrum sensor etc.) after using a period of time (long or short), due to reasons such as sensor characteristic in itself and light path and circuits
Data error can be caused, operative sensor even causes very big data-bias, it is most likely that cause system alarm too early or
Delayed alarm.Initial demarcation no longer can guarantee that the accuracy of Monitoring Data, thus need to the SF after operation a period of time6Electricity
The apparatus insulated state on_line monitoring system of gas is re-scaled.
Patent name is：Sulfur hexafluoride inflatable-type breaker insulation state on-line monitoring device, inventor：Zhang Ying, Lee
Army defends, Application No.：2012205856325, it which disclose sulfur hexafluoride inflatable-type breaker state of insulation and supervise online
Device is surveyed, the device, which does not have a power failure, can monitor SF in real time6Breaker moderate purity and catabolite SO2Content, inflatable can be monitored in real time
The operation conditions of breaker, but because the sulfur hexafluoride inflatable-type breaker insulation state on-line monitoring device of scene operation is
Once demarcated before putting into operation, after sulfur hexafluoride inflatable-type breaker insulation state on-line monitoring device puts into operation but not
Demarcated again, it is difficult to ensure the accuracy of later stage Monitoring Data.
The content of the invention
The purpose of the present invention：Standby demarcation mouth is set in original on-line monitoring system, using standby demarcation mouth to online prison
Examining system is demarcated, and proposes to demarcate postrun on-line monitoring system using least square method, can be reduced as far as possible
The error that sensor is brought after a long time use, it is ensured that later stage systems stay reliability of operation, to overcome prior art
It is not enough.
The technical scheme is that：A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system,
Including following steps：
The first step, with SF6For the SO of the various concentrations of spirit2Gas is used as calibrating gas parameter；
Second step, the connection for disconnecting on-line monitoring system and main equipment, stop on-line monitoring system operating, to on-line monitoring
System is vacuumized, and equipment is demarcated by the standby demarcation mouthful set in on-line monitoring system；
3rd step, the successively order ascending according to standard gas concentration, fill into on-line monitoring system gas circuit structure
Enter calibrating gas, and the actually measured data of record system；
4th step, carry out curve fitting using measured value as abscissa and standard gas concentration, surveyed as ordinate
The functional relation of value and standard gas concentration；
5th step, the 4th step obtain linear function on the basis of, repeat the 3rd step, be filled with again into system by it is small to
The calibrating gas of big concentration, and measured value is obtained, carry out curve fitting again, obtain new curved line relation expression formula；
6th step, the 5th step of repetition, are repeated curve matching, its linear relationship is reached most preferably, and meet error model
Enclose, that is, complete the demarcation of system；
7th step, demarcation are again coupled to after finishing with main equipment, recovery system operation.
It is described with SF6For the SO of spirit2Gas is SO as calibrating gas parameter2Gas concentration be respectively 2.45 μ L/L,
4.5 μ L/L, 4.87 μ L/L, 8.97 μ L/L, 10.76 μ L/L, 46.4 μ L/L and 62.3 μ L/L.
Described curve matching comprises the following steps：
The first step, one group of measured value known to, and measured value has error with standard gas concentration, then obtains from change
The functional relation between X and dependent variable Y is measured, the mathematic(al) representation of its function is：
Y=F (X)
In formula：Y is standard gas concentration, and X is measured value；
Second step, concentration error δ minimum values are obtained, its mathematic(al) representation calculated is：
In formula：δ is concentration error, and i is sample introduction or pendulous frequency, and m is the m times sample introduction or measurement, xiFor the measurement of ith
Value, yiStandard gas concentration is entered by ith
3rd step, using the output of sensor it is a kind of linear approximate relationship, only need to be using linear in transducer calibration
Relation is fitted, and the mathematic(al) representation of its linear relationship fitting is：
Y=KX+B
Wherein, Y is correction value, and X is measured value, and K is amendment proportionality coefficient, and B is amendment deviation factor；
4th step, it can be drawn according to step (3) and step (2)
In formula：δ is concentration error, and K is amendment proportionality coefficient, and B is amendment deviation factor, and i is sample introduction or pendulous frequency, m
For the m times sample introduction or measurement, xiFor the measured value of ith, yiStandard gas concentration is entered by ith.
5th step, a binary function for δ being regarded as independent variable K and B, the mathematic(al) representation of its function is：
δ=δ (K, B)；
6th step, binding test data, obtain adjusted coefficient K and B, and its mathematic(al) representation calculated is：
In formula：δ is concentration error, and K is amendment proportionality coefficient, and B is amendment deviation factor, and i is sample introduction or pendulous frequency, m
For the m times sample introduction or measurement, xiFor the measured value of ith, yiStandard gas concentration is entered by ith.
Compared with the prior art, irregularly on-Line Monitor Device is demarcated by standby demarcation mouth, while utilizing this
The method that invention is provided is demarcated, and this method is applied to operating sulfur hexafluoride electrical equipment current transformer and breaker
SO2Content and purity on-line monitoring system, moisture, SO can be monitored simultaneously2On-line monitoring system, the GIS optoacoustics of content and purity
Spectral resolution component on-line monitoring system etc., can overcome prior art.
Brief description of the drawings
Fig. 1 is gas circuit structure schematic diagram of the present invention；
Fig. 2 is matched curve Fig. 1 of the invention；
Fig. 3 is matched curve Fig. 2 of the invention；
Fig. 4 is matched curve Fig. 3 of the invention；
In figure：6th, switch electromagnetic valve, 7, measurement air chamber, 8, digital pressure gauge, 10, switch electromagnetic valve.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings
It is (special with the sulfur hexafluoride inflatable-type breaker insulation state on-line monitoring device run in early days as shown in accompanying drawing 1-4
Sharp ZL201220585632.5) exemplified by, after operation 1 year half, SO2The data of sensor test occur in that larger error.Most
The need for the calibration curve of first instrument no longer meets Monitoring Data accuracy, due to the attenuation characteristic of electrochemical sensor, it is impossible to
Calibration, then must re-scale.
With SF6For the SO of spirit2Gas is used as calibrating gas, the SO of its nameplate mark2Gas concentration is 2.45 μ L/ respectively
This 7 kinds of various concentrations gases of L, 4.5 μ L/L, 4.87 μ L/L, 8.97 μ L/L, 10.76 μ L/L, 46.4 μ L/L and 62.3 μ L/L.Connect
The calibration experiment got off is carried out on the basis of the standard gas concentration.
The connection of disconnection system and main equipment, halt system operating, is vacuumized to system, passes through the demarcation reserved in device
Mouth demarcation 1# machines.
In order to save gas, gas flow space is reduced, therefore demarcation gas circuit is using the structure chart shown in Fig. 1, calibrating gas
It is filled with from the calibrating gas interface of switch electromagnetic valve 6, the measured (SO of air chamber 72Electrochemical sensor), from switch electromagnetic valve 10
Floss hole discharge, from digital pressure gauge 8 may be viewed by pipeline in gas actual pressure.
(1) inflated into demarcation gas circuit structure
I, the successively order ascending according to standard gas concentration, the insufflation gas into gas circuit structure, and record experiment
Data.Experimental data is as shown in table 1：
The 1# machines experimental result 1 of table 1
| Sequence number | Calibrating gas | Experimental data |
| 0 | 0μL/L | 4.7μL/L |
| 1 | 2.45μL/L | 4.8μL/L |
| 2 | 4.5μL/L | 5.2μL/L |
| 3 | 4.87μL/L | 5.4μL/L |
| 4 | 8.97μL/L | 6.0μL/L |
| 5 | 10.16μL/L | 6.4μL/L |
| 6 | 46.4μL/L | 13.6μL/L |
| 7 | 62.3μL/L | 17.4μL/L |
Calibrating gas is carried out curve fitting with experimental data, the curve of fitting is as shown in Figure 2.
In Fig. 2, using experimental data as abscissa, calibrating gas parameter is as ordinate, and the curve being fitted is " series
1 ", the linear relationship curve of standard is " linear (series 1) ".The curved line relation expression formula being fitted is y=4.858x-
21.104。
II, on the basis of curve matching y=4.858x-21.104, it is descending according to standard gas concentration successively
Sequentially, the insufflation gas into gas circuit structure, and record experimental data.Experimental data is as shown in table 2：
The 1# machines experimental result 2 of table 2
| Sequence number | Calibrating gas | Experimental data |
| 0 | 0μL/L | 3.1μL/L |
| 1 | 2.45μL/L | 3.5μL/L |
| 2 | 4.5μL/L | 6.4μL/L |
| 3 | 4.87μL/L | 6.8μL/L |
| 4 | 8.97μL/L | 11.3μL/L |
| 5 | 10.16μL/L | 12.6μL/L |
| 6 | 46.4μL/L | 48.8μL/L |
| 7 | 62.3μL/L | 63.6μL/L |
Calibrating gas is carried out curve fitting with experimental data, the curve of fitting is as shown in Figure 3.
In Fig. 3, the curved line relation expression formula being fitted is y=1.0068x-2.1882.
III, on the basis of curve matching y=1.0068x-2.1882, it is ascending according to standard gas concentration successively
Order, insufflation gas into gas circuit structure, and record experimental data.Experimental data is as shown in table 3：
The 1# machines experimental result 3 of table 3
| Sequence number | Calibrating gas | Experimental data |
| 0 | 0μL/L | 0.1μL/L |
| 1 | 2.45μL/L | 0.7μL/L |
| 2 | 4.5μL/L | 3.4μL/L |
| 3 | 4.87μL/L | 3.7μL/L |
| 4 | 8.97μL/L | 7.7μL/L |
| 5 | 10.16μL/L | 8.6μL/L |
| 6 | 46.4μL/L | 43.6μL/L |
| 7 | 62.3μL/L | 61.1μL/L |
Calibrating gas is carried out curve fitting with experimental data, the curve of fitting is as shown in Figure 4.
In Fig. 4, the curved line relation expression formula being fitted is y=1.0147x+1.1067.
In the 3rd curve matching, it has been found that the curve being fitted meets error range closest to straight line, i.e.,
Small concentration error is (- 1,1), and big concentration error is (- 10%, 10%).The demarcation of 1# machines is finished.It can meet again in operation
SF6On-line monitoring system detects the accuracy of data.Demarcation is again coupled to after finishing with main equipment, recovery system operation.
This method is applied to the SO of operating sulfur hexafluoride electrical equipment current transformer and breaker2Content and purity
On-line monitoring system, moisture, SO can be monitored simultaneously2The on-line monitoring system of content and purity, GIS optoacoustic spectroscopy decomposition components exist
Line monitoring system etc..
Claims (3)
1. a kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system, it is characterised in that：Including following several
Individual step：
The first step, with SF6For the SO of the various concentrations of spirit2Gas is used as calibrating gas parameter；
Second step, the connection for disconnecting on-line monitoring system and main equipment, stop on-line monitoring system operating, to on-line monitoring system
Vacuumize, equipment is demarcated by the standby demarcation mouthful set in on-line monitoring system；
3rd step, the successively order ascending according to standard gas concentration, mark is filled with into on-line monitoring system gas circuit structure
Quasi- gas, and the actually measured data of record system；
4th step, carried out curve fitting as ordinate using measured value as abscissa and standard gas concentration, obtain measured value
With the functional relation of standard gas concentration；
5th step, the 4th step obtain linear function on the basis of, repeat the 3rd step, be filled with again into system ascending dense
The calibrating gas of degree, and measured value is obtained, carry out curve fitting again, obtain new curved line relation expression formula；
6th step, the 5th step of repetition, are repeated curve matching, its linear relationship is reached most preferably, and meet error range, i.e.,
The demarcation of completion system；
7th step, demarcation are again coupled to after finishing with main equipment, recovery system operation.
2. a kind of SF according to claim 16The operation scaling method of insulation of electrical installation state on_line monitoring system, its
It is characterised by：It is described with SF6For the SO of spirit2Gas is SO as calibrating gas parameter2Gas concentration is respectively 2.45 μ L/
L, 4.5 μ L/L, 4.87 μ L/L, 8.97 μ L/L, 10.76 μ L/L, 46.4 μ L/L and 62.3 μ L/L.
3. a kind of SF according to claim 16The operation scaling method of insulation of electrical installation state on_line monitoring system, its
It is characterised by：Described curve matching comprises the following steps：
The first step, one group of measured value known to, and measured value has error with standard gas concentration, then obtains independent variable X
With the functional relation between dependent variable Y, the mathematic(al) representation of its function is：
Y=F (X)
In formula：Y is standard gas concentration, and X is measured value；
Second step, concentration error δ minimum values are obtained, its mathematic(al) representation calculated is：
In formula：δ is concentration error, and i is sample introduction or pendulous frequency, and m is the m times sample introduction or measurement, xiFor the measured value of ith, yi
Standard gas concentration is entered by ith
3rd step, using the output of sensor it is a kind of linear approximate relationship, only linear relationship need to be used in transducer calibration
It is fitted, the mathematic(al) representation of its linear relationship fitting is：
Y=KX+B
Wherein, Y is correction value, and X is measured value, and K is amendment proportionality coefficient, and B is amendment deviation factor；
4th step, it can be drawn according to step (3) and step (2)
In formula：δ is concentration error, and K is amendment proportionality coefficient, and B is amendment deviation factor, and i is sample introduction or pendulous frequency, and m is m
Secondary sample introduction or measurement, xiFor the measured value of ith, yiStandard gas concentration is entered by ith.
5th step, a binary function for δ being regarded as independent variable K and B, the mathematic(al) representation of its function is：
δ=δ (K, B)；
6th step, binding test data, obtain adjusted coefficient K and B, and its mathematic(al) representation calculated is：
In formula：δ is concentration error, and K is amendment proportionality coefficient, and B is amendment deviation factor, and i is sample introduction or pendulous frequency, and m is m
Secondary sample introduction or measurement, xiFor the measured value of ith, yiStandard gas concentration is entered by ith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283864.2A CN107024672B (en) | 2017-04-26 | 2017-04-26 | A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283864.2A CN107024672B (en) | 2017-04-26 | 2017-04-26 | A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107024672A true CN107024672A (en) | 2017-08-08 |
| CN107024672B CN107024672B (en) | 2019-08-09 |
Family
ID=59527186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710283864.2A Active CN107024672B (en) | 2017-04-26 | 2017-04-26 | A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107024672B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945329A (en) * | 2021-10-14 | 2022-01-18 | 西安西电开关电气有限公司 | SF (sulfur hexafluoride)6Gas leakage defect studying and judging method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763096A (en) * | 2009-12-18 | 2010-06-30 | 北京七星华创电子股份有限公司 | Automatic calibrating and testing system and calibrating and testing method thereof |
| CN105628752A (en) * | 2014-11-28 | 2016-06-01 | 国网青海省电力公司电力科学研究院 | Calibration method of electrochemical sensor |
| CN105806898A (en) * | 2016-03-10 | 2016-07-27 | 电子科技大学 | Gas concentration calibration method for gas sensor |
| CN105938133A (en) * | 2016-04-07 | 2016-09-14 | 中国农业大学 | Method and system for on-line calibration of wireless gas sensors |
| CN105974062A (en) * | 2016-06-03 | 2016-09-28 | 中国矿业大学 | Gas sensor calibration device and calibration method thereof |
-
2017
- 2017-04-26 CN CN201710283864.2A patent/CN107024672B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763096A (en) * | 2009-12-18 | 2010-06-30 | 北京七星华创电子股份有限公司 | Automatic calibrating and testing system and calibrating and testing method thereof |
| CN105628752A (en) * | 2014-11-28 | 2016-06-01 | 国网青海省电力公司电力科学研究院 | Calibration method of electrochemical sensor |
| CN105806898A (en) * | 2016-03-10 | 2016-07-27 | 电子科技大学 | Gas concentration calibration method for gas sensor |
| CN105938133A (en) * | 2016-04-07 | 2016-09-14 | 中国农业大学 | Method and system for on-line calibration of wireless gas sensors |
| CN105974062A (en) * | 2016-06-03 | 2016-09-28 | 中国矿业大学 | Gas sensor calibration device and calibration method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 吴湘黔等: "SF6气体纯度在线监测系统的研究与设计", 《电工技术》 * |
| 程涛等: "地下空间空气质量检测仪的现场标定与校准方法研究", 《制冷与空调》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945329A (en) * | 2021-10-14 | 2022-01-18 | 西安西电开关电气有限公司 | SF (sulfur hexafluoride)6Gas leakage defect studying and judging method and system |
| CN113945329B (en) * | 2021-10-14 | 2024-01-23 | 西安西电开关电气有限公司 | SF (sulfur hexafluoride) 6 Method and system for judging gas leakage defect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107024672B (en) | 2019-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106706487B (en) | Remote full-flow calibration system for flue gas and ambient air on-line monitoring equipment | |
| CN102889968B (en) | Acoustical method for detecting low-concentration sulfur hexafluoride gas | |
| CN106338475A (en) | SF6 gas component online real-time monitoring apparatus and SF6 gas component online real-time monitoring method | |
| CN204903498U (en) | Hand -held type sulfur hexafluoride humidity measuring instrument's multichannel calibrating device | |
| CN111562248A (en) | Based on SF6Internal standard GIS fault diagnosis method | |
| CN107024672B (en) | A kind of SF6The operation scaling method of insulation of electrical installation state on_line monitoring system | |
| CN102042899B (en) | Device and method for detecting gas leakage of sulfur hexafluoride high pressure vacuum switch | |
| CN107764477B (en) | Calibration method and system of wind pressure sensor | |
| CN204142420U (en) | Vacuum and leak rate Multifunctional school standard apparatus | |
| CN112710437A (en) | SF6Dry type vacuum leak detection system and leak detection method for breaker box body | |
| CN110045200B (en) | Test calibration device of SF6 transmitter | |
| CN109442225B (en) | Insulating gas online monitoring system and method for preventing and detecting pipeline leakage | |
| CN106338588A (en) | Testing and calibrating method and device of recharge rate of online detector of sulfur hexafluoride | |
| CN116660465A (en) | Sulfur hexafluoride decomposition product complementary sensing array detection device and method | |
| CN111678036A (en) | Sulfur hexafluoride tail gas recovery device | |
| CN203881673U (en) | Portable capsule replacement type micro-water measurement instrument | |
| CN104062619A (en) | Verification system for on-line monitoring device of double-signal-source capacitive equipment | |
| CN115452978A (en) | Reliability judgment method and device for power transformer insulation system | |
| CN104089978A (en) | Built-in detection system for sulfur hexafluoride gas humidity | |
| CN109939314A (en) | A kind of altitude compensation method of the differential flow sensor of ventilator | |
| CN104316579A (en) | Gas distribution method of detector for detecting SF6 gas decomposition products | |
| CN201000341Y (en) | Adjustable constant voltage precision air source device | |
| CN108152061B (en) | Side window pressure detection system and method | |
| CN106093118A (en) | The portable set of a kind of moisture in detected gas and method | |
| CN106556419A (en) | Low pressure test chamber calibrating installation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |