CN206161625U - Sulfur hexafluoride on -line detector returns and fills rate detection and calibration device - Google Patents
Sulfur hexafluoride on -line detector returns and fills rate detection and calibration device Download PDFInfo
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- CN206161625U CN206161625U CN201621216643.0U CN201621216643U CN206161625U CN 206161625 U CN206161625 U CN 206161625U CN 201621216643 U CN201621216643 U CN 201621216643U CN 206161625 U CN206161625 U CN 206161625U
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Abstract
The embodiment of the utility model discloses sulfur hexafluoride on -line detector returns and fills rate detection and calibration device. The embodiment of the utility model provides an examine sulfur hexafluoride on -line detector and return the gaseous fore -and -after of the sampling standard of filling air chamber pressure and measure through treating, and then treat the rate of filling of returning of examining sulfur hexafluoride on -line detector and calculate, realized to return fill formula sulfur hexafluoride electrical equipment decomposition product on -line detector return the rate of filling detect with the calibration, the calibration steps is automatic can the reinforce, easy operation provides good basic foundation for sulfur hexafluoride on -line detector's safety, steady operation.
Description
Technical field
This utility model is related to sulfur hexafluoride detection field, more particularly to a kind of sulfur hexafluoride on-line detector recharges rate inspection
Survey calibrating installation.
Background technology
With developing rapidly for power industry, SF6Electrical equipment quantity is on the increase, to SF6The quality surveillance of gas is increasingly
It is important.Pure SF6Gas is a kind of preferable dielectric, but under the effect of the factors such as electric arc, spark discharge, high temperature,
SF6Gas easily ionizable decomposes, and the moisture, oxygen in its catabolite and electrical equipment reacts, generation SO2、H2The acid such as S, HF
Property material, and SF4、SOF2、SF2、SO2F2The material extremely strong etc. toxicity and corrosivity.Research shows, makes under different defect types
Species, content, throughput rate, proportionate relationship into the sulfur hexafluoride decomposition product of electrical equipment etc. are different, can be by inspection
Survey the component of sulfur hexafluoride decomposition product, the especially detection of various ingredients, so as to judge failure cause, the electric discharge of electrical equipment
Level, state of development and degree of danger etc..
The current online test method for sulfur hexafluoride electrical equipment gas is due to higher ageing and be subject to
Increasing concern, becomes the main method of sulfur hexafluoride electrical equipment gas detecting.And be to realize to sulfur hexafluoride gas
Effective detection, the especially detection of many decomposition components, on-line detector is required to the gas in sulfur hexafluoride electrical equipment
It is acquired post analysis.But because security performance requirement of the electric power netting safe running code to sulfur hexafluoride electrical equipment is high,
Year leakage rate is sought not above 0.5%, and the air chamber of sulfur hexafluoride electrical equipment is general all less (about 70L), therefore the big day of one's doom
The sampling number of sulfur hexafluoride on-line detector is made, causing most of on-line detector to be only capable of a month even some months is carried out
Once sample.And recharging type on-line detector due to be capable of achieving to gather gas recharge, greatly reduce gas leakage can
Energy property, its effective detection number of times can be significantly annual thousands of times, and recharging for gas does not result in gas in former sulfur hexafluoride air cell
The change of bulk concentration, this pair undoubtedly has important effect, therefore recharging type six with the state of analyzing and diagnosing sulfur hexafluoride air cell
The use of sulfur fluoride on-line checking is more and more extensive.
To ensure the safe and stable operation of on-line detector, all on-line detectors must carry out index of correlation using front
Detection and calibration, wherein especially the most key to recharge rate index.The rate index of recharging is to react the weight that such detector recharges efficiency
Index is wanted, it is too low to recharge rate, easily cause the leakage of sulfur hexafluoride electrical equipment gas, cause sulfur hexafluoride air cell reduced pressure, entered
And affect the insulating properties of electrical equipment.Therefore, recharging type sulfur hexafluoride on-line checking must complete to recharge rate using front
Detection and evaluation.But at present, there is no both at home and abroad can realize recharging recharging type sulfur hexafluoride on-line detector rate detected, school
The platform and method of standard.
It is the needs for adapting to sulfur hexafluoride electrical equipment on-line checking, there is provided a set of suitable for recharging type hexafluoro based on this
Change the platform that sulfur electrical equipment catabolite on-line detector recharges rate detection and calibration, be the safe and stable of on-line detector
Operation is provided according to the problem for being those skilled in the art's needs solution.
Utility model content
This utility model embodiment discloses a kind of sulfur hexafluoride on-line detector and recharges rate testing calibration device, realizes
Rate detection and calibration, calibration steps automatic capability are recharged to recharging type sulfur hexafluoride electrical equipment catabolite on-line detector
By force, simple to operate, the safe and stable operation for sulfur hexafluoride on-line detector provides good basic basis.
This utility model embodiment recharges rate testing calibration device there is provided a kind of sulfur hexafluoride on-line detector, including：
Digital pressure regulating valve, effusion meter, standard air chamber, three-way valve, pressure detector, PLC control unit and computer；
Described digital pressure regulating valve one end and described effusion meter one end connect；
The effusion meter other end and the standard air chamber connect；
The standard air chamber and the pressure detector connect；
First port of the three-way valve is connected with the standard air chamber；
Second port of the three-way valve is connected with sulfur hexafluoride on-line detector to be checked；
The pressure detector is connected with the PLC control unit；
The three-way valve is connected with the PLC control unit；
The digital pressure regulating valve is connected with the PLC control unit；
The effusion meter is connected with the PLC control unit；
The PLC control unit is connected with the computer；
Wherein, the sulfur hexafluoride on-line detector recharges rate testing calibration device by pressure detector in pre-set criteria
Sulfur hexafluoride on-line detector to be checked is got under air chamber pressure parameter carries out the letter of the standard air chamber pressure after gas production, refilling operation
Breath；
The sulfur hexafluoride on-line detector recharges rate testing calibration device and judges the pre-set criteria gas by computer
Whether chamber pressure force parameter exceedes preset difference with the difference of the standard air chamber pressure information, if so, then according to the preset mark
Quasi- air chamber pressure parameter recharges rate formula and is calculated the first standard time with the standard air chamber pressure information by pre-set criteria
Rate is filled, if it is not, then get sulfur hexafluoride to be checked under pre-set criteria air chamber pressure parameter again through pressure detector existing
Line detector carries out the standard air chamber pressure information after gas production, refilling operation；
The sulfur hexafluoride on-line detector recharges rate testing calibration device and is at least recycled for operating twice and obtains
Two standards recharge rate and the 3rd standard recharges rate；
The sulfur hexafluoride on-line detector is recharged rate testing calibration device and is recharged first standard by computer
Rate, second standard recharge rate and the 3rd standard recharges rate and carries out being calculated standard and recharges rate meansigma methodss, and by institute
The standard of stating recharges rate meansigma methodss and compares with the rate limit value of recharging.
Preferably, a kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device
Also include：Sulfur hexafluoride leakage alarm；
The sulfur hexafluoride leakage alarm is connected with the PLC control unit.
Preferably, a kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device
Also include：Pure sulfur hexafluoride gas cylinder；
The pure sulfur hexafluoride gas cylinder is connected with the digital pressure regulating valve other end.
Preferably, a kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device
Also include：High pure nitrogen constant temperature cabinet；
The digital pressure regulating valve, the effusion meter, the standard air chamber, the three-way valve, the pressure detector
It is arranged in the high pure nitrogen constant temperature cabinet with the sulfur hexafluoride leakage alarm；
The high pure nitrogen constant temperature cabinet side is provided with standard and connects pore, and the second port of the three-way valve passes through the mark
Standard connects pore and is connected with sulfur hexafluoride on-line detector to be checked.
Preferably, a kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device
Also include：Vacuum pump, compressor and waste gas bottle；
The third connectivity mouth of the three-way valve is connected with described vacuum pump one end；
The vacuum pump other end is connected with described compressor one end；
The compressor other end is connected with the waste gas bottle.
Preferably, the vacuum pump is connected with the PLC control unit；
The compressor is connected with the PLC control unit.
As can be seen from the above technical solutions, this utility model embodiment has advantages below：
This utility model embodiment recharges rate testing calibration device there is provided a kind of sulfur hexafluoride on-line detector, including：
Digital pressure regulating valve, effusion meter, standard air chamber, three-way valve, pressure detector, PLC control unit and computer；The numeral
Pressure-regulating valve one end and described effusion meter one end connect；The effusion meter other end and the standard air chamber connect；The mark
Quasi- air chamber and the pressure detector connect；First port of the three-way valve is connected with the standard air chamber；The three-way valve
The second port be connected with sulfur hexafluoride on-line detector to be checked；The pressure detector is connected with the PLC control unit；Institute
State three-way valve to be connected with the PLC control unit；The digital pressure regulating valve is connected with the PLC control unit；The stream
Gauge is connected with the PLC control unit；The PLC control unit is connected with the computer.This utility model is applied to back
Fill formula sulfur hexafluoride electrical equipment catabolite on-line detector and recharge rate detection and calibration, calibration steps automatic capability is strong,
Simple to operate, the safe and stable operation for sulfur hexafluoride on-line detector provides good basic basis
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is that a kind of sulfur hexafluoride on-line detector provided for this utility model embodiment recharges rate testing calibration device
Structural representation；
Fig. 2 is the schematic diagram of sulfur hexafluoride on-line detector gas recovery to be checked；
Fig. 3 is the schematic diagram that sulfur hexafluoride on-line detector to be checked recharges process；
Fig. 4 recharges rate testing calibration device certainly for a kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided
The schematic flow sheet of calibration.
Wherein, labelling is as described below in figure：
1. 2. digital pressure regulating valve of pure sulfur hexafluoride gas cylinder, 3. effusion meter, 4. standard air chamber, 5. three-way valve 6. are high-purity
The standard of nitrogen constant temperature cabinet 7. connects the vacuum pump of the 9. waste gas bottle of sulfur hexafluoride on-line detector to be checked of pore 8., 10. compressor 11.
The computer of 13. pressure detector of 12.PLC control units, 14. sulfur hexafluoride leakage alarm 15.
Specific embodiment
This utility model embodiment discloses a kind of sulfur hexafluoride on-line detector and recharges rate testing calibration device, realizes
Rate detection and calibration, calibration steps automatic capability are recharged to recharging type sulfur hexafluoride electrical equipment catabolite on-line detector
By force, simple to operate, the safe and stable operation for sulfur hexafluoride on-line detector provides good basic basis.
Fig. 1 is referred to, a kind of sulfur hexafluoride on-line detector provided in this utility model embodiment recharges rate detection school
One embodiment of standard apparatus, including：
Digital pressure regulating valve 2, effusion meter 3, standard air chamber 4, three-way valve 5, pressure detector 13, PLC control unit 12
With computer 15；
The one end of digital pressure regulating valve 2 and the one end of effusion meter 3 connect；
The other end of effusion meter 3 and standard air chamber 4 connect；
Standard air chamber 4 and pressure detector 13 connect；
First port of three-way valve 5 is connected with standard air chamber 4；
Second port of three-way valve 5 is connected with sulfur hexafluoride on-line detector 8 to be checked；
Pressure detector 13 is connected with PLC control unit 12；
Three-way valve 5 is connected with PLC control unit 12；
Digital pressure regulating valve 2 is connected with PLC control unit 12；
Effusion meter 3 is connected with PLC control unit 12；
PLC control unit 12 is connected with computer 15.
In the present embodiment, the inlet pressure range ability of digital pressure regulating valve 2 be 0～25MPa, outlet pressure range model
Enclose for 0～1MPa, minimum indexing is 0.01Mpa.
Effusion meter 3 is sulfur hexafluoride special digital mass flowmenter, and its range is 0～2L/min, and minimum indexing is
0.001L/min。
Standard Gases pond 4 is rustless steel air chamber, and volume size is 1L, and highest pressure-bearing is 20MPa.
Digital pressure regulating valve 2 is connected by holding wire with PLC control unit 12, the outlet pressure of digital pressure regulating valve 2
Power is set by PLC control unit 12.
Effusion meter 3 is connected by holding wire with PLC control unit 12, and the uninterrupted of effusion meter 3 is by PLC control unit 12
Set.
The each detection data of device is mainly uploaded to computer 15 by PLC control unit 12, further according to the correlation of computer 15
The each subelement work of CCE.
In the present embodiment, detection process is：
(1) sulfur hexafluoride on-line detector recharges rate testing calibration device by pressure detector 13 in pre-set criteria air chamber
Sulfur hexafluoride on-line detector to be checked is got under pressure parameter carries out the standard air chamber pressure information after gas production, refilling operation,
And normal pressure information is sent to into computer 15 by PLC unit 12；
(2) computer 15 judges whether pre-set criteria air chamber pressure parameter exceedes in advance with the difference of standard air chamber pressure information
Difference is put, if so, then rate is recharged by pre-set criteria according to pre-set criteria air chamber pressure parameter and standard air chamber pressure information public
Formula is calculated the first standard and recharges rate, if it is not, then re-executing (1)；
(3) computer obtains the first standard and recharges after rate, and sulfur hexafluoride on-line detector recharges rate testing calibration device again
Circulation performs (1) and (2) at least twice, and second standard that obtains recharges rate and the 3rd standard recharges rate；
(4) the first standard recharges rate, the second standard recharge rate and the 3rd standard recharges rate and carries out being calculated standard and returns
Rate meansigma methodss are filled, and standard is recharged into rate meansigma methodss and compared with the rate limit value of recharging.
A kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device also to be included：
Sulfur hexafluoride leakage alarm 14；
Sulfur hexafluoride leakage alarm 14 is connected with PLC control unit 12.
In the present embodiment, the detection of sulfur hexafluoride leakage alarm 14 limit value is 10ppm, mainly for detection of high pure nitrogen
In constant temperature cabinet 6 in nitrogen sulfur hexafluoride gas concentration.
Sulfur hexafluoride alarm 14 is connected by holding wire with PLC control unit 12, for detected value to be uploaded to into PLC controls
Unit processed 12, once detected value exceedes limit value, PLC control unit 12 will immediately stop platform alignment work.
A kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device also to be included：
Pure sulfur hexafluoride gas cylinder 1；
Pure sulfur hexafluoride gas cylinder 1 is connected with the other end of digital pressure regulating valve 2.
A kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device also to be included：
High pure nitrogen constant temperature cabinet 6 (nitrogen gas purity 99.99%), is mainly used in preventing from recharging sulfur hexafluoride in rate detection platform opertions engineering
The leakage of gas, so as to prevent detection error；
Digital pressure regulating valve 2, effusion meter 3, standard air chamber 4, three-way valve 5, pressure detector 13 and sulfur hexafluoride are revealed
Alarm 14 is arranged in high pure nitrogen constant temperature cabinet 6；
The side of high pure nitrogen constant temperature cabinet 6 is provided with standard and connects pore 7, and the second port of three-way valve 5 connects pore 7 by standard
It is connected with sulfur hexafluoride on-line detector 8 to be checked.
A kind of sulfur hexafluoride on-line detector that this utility model embodiment is provided recharges rate testing calibration device also to be included：
Vacuum pump 11, compressor 10 and waste gas bottle 9；
The third connectivity mouth of three-way valve 5 is connected with the one end of vacuum pump 11；
The other end of vacuum pump 11 is connected with the one end of compressor 10；
The other end of compressor 10 is connected with waste gas bottle 9.
In the present embodiment, vacuum pump 11 is vacuum diaphragm pump, and minimum vacuum pressure is 500pa, and maximum stream flow is 4L/
min.The maximum pressure of compressor 10 is 1Mpa.Waste gas bottle 9 is rustless steel steel cylinder, and volume size is 5L, and maximum pressure-bearing is
10Mpa。
Pressure detector 13 is connected with PLC control unit 12, and vacuum pump 11 is connected with PLC control unit 12, compressor 10
It is connected with PLC control unit 12.
In the present embodiment, pressure display unit 13 be used for examination criteria air chamber 4 in gas pressure, detection range for-
0.1MPa～1MPa, for 0.0001Mpa simultaneously, pressure display unit 13 is by holding wire and the phase of PLC control unit 12 for minimum indexing
Even, PLC control unit 12 can in real time reflect the pressure value of pressure display unit 13, and according to the pressure value of pressure display unit 13 come
Control compressor 9, the start and stop of vacuum pump 10.
The above is that the structure and connected mode that rate testing calibration device is recharged to a kind of sulfur hexafluoride on-line detector is carried out
Detailed description, for ease of understand, below will with a concrete application scene a kind of sulfur hexafluoride on-line detector will be recharged rate inspection
The application for surveying calibrating installation is illustrated, and refers to Fig. 2 to Fig. 4, and application examples includes：
(1) initialize
Sulfur hexafluoride on-line detector 8 to be checked is recharged into rate calibrating by standard sulfur hexafluoride air valve 7 and sulfur hexafluoride flat
Platform is connected, and starts detecting platform, detects whether each subsystem signals are normal by PLC signaling control units 12, main to include number
The inlet pressure of word pressure-regulating valve 2 requires to be more than 1MPa, and the flow value of effusion meter 3 is 0ml/min, the pressure of pressure detector 13
Force value is not 0, and sulfur hexafluoride leakage alarm 14 is shown as 0ppm, and vacuum pump 10, the signal that has of compressor 9 are responded.
(2) system self-calibration
System self-calibration is mainly used in removing the foreign gas in detection platform, and its basic process is as shown in Figure 4.
(3) rate detection is recharged
According to the use range of sulfur hexafluoride on-line detector 8 to be checked, its typically complete the pressure of standard air chamber 4 for 0.4,0.5,
Detection under 0.6 and 0.7MPa pressure.
1. the detection under 0.4MPa pressure is carried out first；
The outlet pressure of digital pressure regulating valve 2 is set as 0.5MPa by PLC signaling control units 12, effusion meter 3
Flow is 0.5L/min, and when the pressure value of pressure detector 13 reaches preset value 0.4Mpa, system is out of service.
The rate detection process of recharging is：
A. sulfur hexafluoride on-line detector to be checked starts, and completes gas production (as shown in Figure 2), recharges (as shown in Figure 3) process；
B. judge to carry out gas production and before recharging with carry out gas production and recharge after pressure detector change and whether exceed
0.01MPa, if exceeding, performs c, if being less than, performs a；
C. calculate standard and recharge rate；
D. recirculation performs a to c twice；
E. calculate standard and recharge rate meansigma methodss, and compare with the rate limit value of recharging.
In the present embodiment, standard recharges rate formula and is：
Wherein, x recharges rate for standard, and unit is %；P1To start standard air chamber pressure during detection, unit is MPa；P2For
Standard air chamber pressure during detection is completed, unit is MPa；N recharges number of times for sampling.
Recharge rate limit value to obtain by the way that formula is calculated as below：
Wherein：T is gas refill rate limit value, and unit is %；Pi1The pressure of examination criteria air chamber when starting is detected for i ＆ lt
Power, unit is MPa；Pi2For the pressure of examination criteria air chamber after the completion of i ＆ lt detection, unit is MPa；N recharges number of times for sampling.
The detection of 2. 0.5MPa, 0.6MPa, 0.7MPa with calibrate similar with 0.4MPa.
Recharging rate testing calibration device to a kind of sulfur hexafluoride on-line detector provided by the utility model above is carried out
It is discussed in detail, for one of ordinary skill in the art, according to the thought of this utility model embodiment, in specific embodiment
And will change in range of application, in sum, this specification content should not be construed as to restriction of the present utility model.
Claims (6)
1. a kind of sulfur hexafluoride on-line detector recharges rate testing calibration device, it is characterised in that include：Digital pressure is adjusted
Valve, effusion meter, standard air chamber, three-way valve, pressure detector, PLC control unit and computer；
Described digital pressure regulating valve one end and described effusion meter one end connect；
The effusion meter other end and the standard air chamber connect；
The standard air chamber and the pressure detector connect；
First port of the three-way valve is connected with the standard air chamber；
Second port of the three-way valve is connected with sulfur hexafluoride on-line detector to be checked；
The pressure detector is connected with the PLC control unit；
The three-way valve is connected with the PLC control unit；
The digital pressure regulating valve is connected with the PLC control unit；
The effusion meter is connected with the PLC control unit；
The PLC control unit is connected with the computer；
Wherein, the sulfur hexafluoride on-line detector recharges rate testing calibration device by pressure detector in pre-set criteria air chamber
Sulfur hexafluoride on-line detector to be checked is got under pressure parameter carries out the standard air chamber pressure information after gas production, refilling operation；
The sulfur hexafluoride on-line detector recharges rate testing calibration device and judges the pre-set criteria air chamber pressure by computer
Whether force parameter exceedes preset difference with the difference of the standard air chamber pressure information, if so, then according to the pre-set criteria gas
Chamber pressure force parameter recharges rate formula and is calculated the first standard and recharges rate with the standard air chamber pressure information by pre-set criteria,
If it is not, then sulfur hexafluoride on-line checking to be checked is got under pre-set criteria air chamber pressure parameter again through pressure detector
Instrument carries out the standard air chamber pressure information after gas production, refilling operation；
The sulfur hexafluoride on-line detector recharges rate testing calibration device and is at least recycled for operating twice and obtains the second mark
Standard recharges rate and the 3rd standard recharges rate；
The sulfur hexafluoride on-line detector recharges rate testing calibration device and first standard is recharged into rate, institute by computer
State that the second standard recharges rate and the 3rd standard recharges rate and carries out being calculated standard and recharges rate meansigma methodss, and by the standard
Recharge rate meansigma methodss to compare with the rate limit value of recharging.
2. sulfur hexafluoride on-line detector according to claim 1 recharges rate testing calibration device, it is characterised in that also wrap
Include：Sulfur hexafluoride leakage alarm；
The sulfur hexafluoride leakage alarm is connected with the PLC control unit.
3. sulfur hexafluoride on-line detector according to claim 2 recharges rate testing calibration device, it is characterised in that also wrap
Include：Pure sulfur hexafluoride gas cylinder；
The pure sulfur hexafluoride gas cylinder is connected with the digital pressure regulating valve other end.
4. sulfur hexafluoride on-line detector according to claim 3 recharges rate testing calibration device, it is characterised in that also wrap
Include：High pure nitrogen constant temperature cabinet；
The digital pressure regulating valve, the effusion meter, the standard air chamber, the three-way valve, the pressure detector and institute
State sulfur hexafluoride leakage alarm to be arranged in the high pure nitrogen constant temperature cabinet；
The high pure nitrogen constant temperature cabinet side is provided with standard and connects pore, and the second port of the three-way valve is connect by the standard
Pore is connected with sulfur hexafluoride on-line detector to be checked.
5. sulfur hexafluoride on-line detector according to claim 4 recharges rate testing calibration device, it is characterised in that also wrap
Include：Vacuum pump, compressor and waste gas bottle；
The third connectivity mouth of the three-way valve is connected with described vacuum pump one end；
The vacuum pump other end is connected with described compressor one end；
The compressor other end is connected with the waste gas bottle.
6. sulfur hexafluoride on-line detector according to claim 5 recharges rate testing calibration device, it is characterised in that described
Vacuum pump is connected with the PLC control unit；
The compressor is connected with the PLC control unit.
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| CN201621216643.0U CN206161625U (en) | 2016-11-11 | 2016-11-11 | Sulfur hexafluoride on -line detector returns and fills rate detection and calibration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338588A (en) * | 2016-11-11 | 2017-01-18 | 广东电网有限责任公司电力科学研究院 | Testing and calibrating method and device of recharge rate of online detector of sulfur hexafluoride |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338588A (en) * | 2016-11-11 | 2017-01-18 | 广东电网有限责任公司电力科学研究院 | Testing and calibrating method and device of recharge rate of online detector of sulfur hexafluoride |
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