CN116242962A - Gas marking self-calibration method and system of on-line monitoring device for dissolved gas in insulating oil - Google Patents
Gas marking self-calibration method and system of on-line monitoring device for dissolved gas in insulating oil Download PDFInfo
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Abstract
The invention discloses a standard gas self-calibration method and a system of an on-line monitoring device for dissolved gas in insulating oil, comprising the following steps: continuous gas calibration is carried out under the normal condition of the gas calibration pressure; determining the relative standard deviation of the gas component concentration or peak height/peak area under continuous gas calibration, if the relative standard deviation is not smaller than a set threshold value, continuing to perform gas calibration until the relative standard deviation is smaller than the set threshold value, and the continuous calibration times do not exceed the maximum calibration times; if the relative standard deviation still does not meet the requirement when the maximum calibration times are reached, triggering a calibration abnormality alarm; and obtaining the average concentration or peak height/peak area average value of the gas component when the relative standard deviation meets the requirement, comparing the average concentration or peak height/peak area average value with the last calibration data and the first calibration data, and stopping the calibration flow, correcting the gas calibration coefficient or triggering the calibration abnormality alarming operation according to the comparison result. The periodic gas marking calibration of the monitoring device with different detection principles is realized, and the workload of operation and maintenance management is reduced.
Description
Technical Field
The invention relates to the technical field of automatic on-line monitoring of power equipment, in particular to a standard gas self-calibration method and system of an on-line monitoring device for dissolved gas in insulating oil.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The on-line monitoring device for the dissolved gas in the insulating oil can rapidly identify the faults of the oil-filled electrical equipment in real time and alarm, so that the on-line monitoring device is widely applied to the places such as transformer substations, convertor stations, power plants and the like. In the running process of the device, due to the ageing, abnormality or damage of parts, improper operation and maintenance management and other reasons, the measurement error is increased, the stability is reduced, and the on-line monitoring effect is lost. At present, reference oil samples are required to be used for detecting the devices, the number of installed sites is very large, the detection is time-consuming and labor-consuming, the detection period of 1-2 years is difficult to complete the detection of all the devices, and about half of the detection results often do not meet the standard requirements. Therefore, it is obvious that the device detection by means of preparing the reference oil sample cannot meet the requirement, and it is necessary to shorten the period to detect the device and find out the main problems of the device in time.
The core component of the device is a detection module no matter the gas chromatography or the photoacoustic spectrum detection principle, and is also the component which is most easy to age or damage, and problems can be found in time and defects can be eliminated rapidly by adopting the regular calibration of the standard gas. However, the existing standard gas calibration technology is difficult to be compatible due to the differences between components and systems of various factories of the device and lacks a standard operation and maintenance strategy, so that the implementation is not yet started at present.
Disclosure of Invention
In order to solve the problems, the invention provides a gas marking self-calibration method and a system of an on-line monitoring device for dissolved gas in insulating oil, which realize periodic automatic gas marking of the on-line monitoring device for the dissolved gas in the insulating oil with different detection principles, automatically find out the problems of abnormality and aging of a detection module of the device, impure gas production of a carrier gas pump and the like, and effectively reduce the workload of operation and maintenance management.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the invention provides a method for calibrating a gas marking self-calibration device of an on-line monitoring device for dissolved gas in insulating oil, comprising the following steps:
continuous gas calibration is carried out under the normal condition of the gas calibration pressure;
determining the relative standard deviation of the gas component concentration or peak height/peak area under continuous gas calibration, if the relative standard deviation is not smaller than a set threshold value, continuing to perform gas calibration until the relative standard deviation is smaller than the set threshold value, and the continuous calibration times do not exceed the maximum calibration times; if the relative standard deviation still does not meet the requirement when the maximum calibration times are reached, triggering a calibration abnormality alarm;
and obtaining the average concentration or peak height/peak area average value of the gas component when the relative standard deviation meets the requirement, comparing the average concentration or peak height/peak area average value with the last calibration data and the first calibration data, and stopping the calibration flow, correcting the gas calibration coefficient or triggering the calibration abnormality alarm according to the comparison result.
As an alternative implementation manner, whether the standard pressure is normal is judged, if the standard pressure is smaller than a first threshold value and smaller than a second threshold value which is smaller than the last standard pressure, the standard pressure is abnormal, an alarm prompt is triggered, and the calibration process is terminated; otherwise, continuous gas calibration is carried out under the normal condition of the gas calibration pressure.
As an alternative embodiment, the single labeling process includes:
according to the gas chromatography detection principle, chromatographic preheating, baseline stabilization, standard gas purging, sample introduction, chromatographic sampling, spectrogram analysis and standard gas component retention time judgment are sequentially carried out;
if the deviation between the target gas component retention time and the first calibration exceeds a third threshold value, the retention time is abnormal and warning is carried out, and the target gas component retention time is modified to be the target gas component retention time currently calibrated; otherwise, ending the single gas calibration.
As an alternative embodiment, according to the gas chromatography detection principle, firstly performing chromatography preheating, then judging whether the base line is stable, if the base line is not stable and the preheating is not overtime, continuing to perform chromatography preheating until the base line is stable;
if the preheating is overtime, whether the base line is stable or not, the preheating is overtime and alarming is carried out, and the calibration flow is terminated;
and if the baseline is stable and the preheating is not overtime, carrying out standard gas purging, sample injection, chromatographic sampling, spectrogram analysis and standard gas component retention time judgment.
Alternatively, the process of comparing the last calibration data with the first calibration data includes:
if the relative standard deviation of the first calibration data and the last calibration data is not greater than a fifth threshold value, the gas calibration coefficient is not modified when the relative standard deviation of the first calibration data and the last calibration data is not greater than a sixth threshold value, and the calibration process is terminated;
if the relative standard deviation between the first calibration data and the last calibration data is between the fifth threshold value and the seventh threshold value, correcting the standard gas coefficient when the relative standard deviation between the first calibration data and the first calibration data is between the sixth threshold value and the eighth threshold value;
and if the relative standard deviation of the calibration data and the previous calibration data is not smaller than the seventh threshold value, triggering a calibration abnormality alarm when the relative standard deviation of the calibration data and the first calibration data is not smaller than the eighth threshold value, and ending the flow.
Alternatively, the modified target gas coefficient is the first target concentration or peak height/peak area divided by the current target concentration or peak height/peak area.
In a second aspect, the invention provides a standard gas self-calibration system of an on-line monitoring device for dissolved gas in insulating oil, comprising: the device comprises an air source module, an air path module and a control module;
the gas source module comprises a standard gas steel cylinder, a pressure sensor and a gas pressure reducing valve, wherein the standard gas steel cylinder is connected with the gas pressure reducing valve, and the pressure sensor is arranged between the standard gas steel cylinder and the gas pressure reducing valve;
the gas circuit module comprises a vent pipe and a gas marking valve, the gas pressure reducing valve is connected with a detection module of the dissolved gas on-line monitoring device through the vent pipe, and the gas marking valve is arranged on the vent pipe;
the control module is used for controlling the conduction of the gas marking valve so as to conduct the gas source module and the detection module when the gas marking is carried out, and the gas marking self-calibration method is carried out according to any one of claims 1-6.
As an alternative embodiment, the standard gas cylinder is filled with a standard mixed gas, and the standard mixed gas uses nitrogen as a base gas, and methane, ethylene, ethane, acetylene, hydrogen, carbon monoxide and carbon dioxide are mixed.
As an alternative embodiment, each gas concentration range includes: methane 30 mu L/L-200 mu L/L, ethylene 30 mu L/L-200 mu L/L, ethane 30 mu L/L-200 mu L/L, acetylene 10 mu L/L-100 mu L/L, hydrogen 200 mu L/L-1000 mu L/L, carbon monoxide 300 mu L/L-2500 mu L/L, and carbon dioxide 1000 mu L/L-4000 mu L/L.
As an alternative implementation mode, the detection module is further connected with the degassing module through a vent pipe, and when oil sample detection is performed, the control module controls the air marking valve to be in a state that the degassing module is communicated with the detection module.
Compared with the prior art, the invention has the beneficial effects that:
the gas marking self-calibration method and system for the insulating oil dissolved gas on-line monitoring device provided by the invention can be used for periodically and automatically marking the insulating oil dissolved gas on-line monitoring devices with different detection principles, are suitable for devices with any detection principles, have the advantages of simple structure, convenient and feasible modification, perfect protection facilities, time and labor saving, high automation degree, can timely find out the abnormal or aging condition of the core components of the device, have an automatic calibration function, and effectively reduce the workload of operation and maintenance management.
The standard gas self-calibration method and system of the on-line monitoring device for the dissolved gas in the insulating oil provided by the invention can automatically discover the problems of abnormality, aging, gas production impurity of a carrier gas pump and the like of a detection module of the device in a short time without depending on long-period detection of a reference oil sample, and simultaneously protect the device by graded alarm without complex calculation of sensitivity, separation degree and the like, and can modify coefficients by simply adjusting retention time, standard gas detection concentration or peak height/peak area according to a setting deviation value judging rule, thereby achieving the function of calibrating the detection module.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow chart of a method for calibrating a target gas in accordance with embodiment 1 of the present invention;
FIG. 2 is a flow chart of single calibration of the gas in accordance with embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a self-calibration system for a target gas according to embodiment 2 of the present invention;
FIG. 4 is a verification data diagram of the standard gas self-calibration method according to embodiment 2 of the present invention;
wherein, 1, a standard gas steel cylinder; 2. a pressure sensor; 3. a gas pressure reducing valve; 4. and a gas marking valve.
Detailed Description
The invention is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides a standard gas self-calibration method of an online monitoring device for dissolved gas in insulating oil, which mainly comprises the processes of parameter setting, calibration flow, grading alarm, data correction and the like; as shown in fig. 1, the method specifically includes:
(1) After the oil sample detection is carried out by the on-line monitoring device for the dissolved gas in the insulating oil to reach the oil measurement times of parameter adjustment, starting a gas marking self-calibration program;
firstly, judging whether the standard pressure is normal or not, if the standard pressure is smaller than a first threshold value and smaller than a second threshold value which is smaller than the last standard pressure, the standard pressure is abnormal, alarming and prompting, prompting the level to be strong, and ending the flow; otherwise, continuous gas calibration is carried out under the normal condition of the gas calibration pressure.
As an alternative implementation manner, the value range of the first threshold is 0.1 Mpa-0.3 Mpa, and the value range of the second threshold is 0.02 Mpa-0.1 Mpa; in this embodiment, the first threshold value is 0.1Mpa, and the second threshold value is 0.05Mpa.
As shown in fig. 2, the single labeling process includes:
(1-1) according to the gas chromatography detection principle device, firstly performing chromatography preheating, then judging whether a base line is stable or not, and if the base line is not stable and the preheating is not overtime, continuing to perform chromatography preheating until the base line is stable;
(1-2) if the preheating is overtime, whether the base line is stable or not, alarming to prompt the preheating to be overtime, prompting the grade to be strong, and ending the flow;
(1-3) if the baseline is stable and the preheating is not overtime, carrying out standard gas purging, sample injection, chromatographic sampling, spectrogram analysis and standard gas component retention time judgment;
(1-4) if the deviation of the retention time of the target gas component from the first calibration exceeds a third threshold value, alarming to prompt that the retention time is abnormal, prompting the grade to be weak, and automatically modifying the retention time of the target gas component to be the retention time of the target gas component currently calibrated; otherwise, directly ending the single gas calibration.
In an alternative embodiment, the third threshold value ranges from ±5% to ±15%, and in this embodiment, the third threshold value is ±10%.
(2) Repeating the gas calibration for a plurality of times (in the embodiment, three times of gas calibration are continuously performed at first), and calculating the relative standard deviation RSD of the gas component concentration or peak height/peak area under the continuous gas calibration;
(3) If the RSD is not smaller than the fourth threshold value, adding one-time gas calibration, and continuously calculating the RSD of the last three continuous calibration until the RSD is smaller than the fourth threshold value and the continuous calibration times are not larger than the maximum calibration times; if the RSD still does not meet the requirements when the maximum calibration times are reached, the alarm prompts that the standard gas repeatability is abnormal, the prompt level is weak, and the process is terminated.
In an alternative embodiment, the value of the fourth threshold ranges from ±1% to ±5%, and in this embodiment, the fourth threshold takes ±3%.
As an alternative implementation manner, the maximum calibration frequency is taken 6 times in this example.
(4) Acquiring the average concentration or peak height/peak area average value of the gas component when the RSD meets the requirement, and comparing the gas component with the last calibration data and the first calibration data; the method comprises the following steps:
(4-1) if the relative standard deviation of the first calibration data and the last calibration data is not greater than a fifth threshold value, if the relative standard deviation of the first calibration data and the last calibration data is not greater than the sixth threshold value, the calibration flow is terminated without any modification of the gas calibration coefficient;
(4-2) correcting the air standard factor if the relative standard deviation from the last calibration data is between the fifth threshold and the seventh threshold and the relative standard deviation from the first calibration data is between the sixth threshold and the eighth threshold;
and (4-3) triggering calibration abnormality warning when the relative standard deviation of the calibration data with the last time is not smaller than a seventh threshold value and the relative standard deviation of the calibration data with the first time is not smaller than an eighth threshold value, prompting the level to be 'strong', and ending the flow.
As an alternative implementation manner, the value range of the fifth threshold is ±1% to ±5%, and the fifth threshold in this example is ±3%;
the value range of the sixth threshold is +/-3% - +/-10%, and the sixth threshold in the embodiment is +/-5%;
the value range of the seventh threshold is +/-5% - +/-10%, and the seventh threshold in the embodiment is +/-10%;
the value range of the eighth threshold is +/-20% - +/-40%, and the eighth threshold in the embodiment is +/-30%.
In this embodiment, the modified standard gas coefficient is: ki' =first calibration concentration or peak height/peak area ≡this calibration concentration or peak height/peak area.
In this embodiment, the above-mentioned standard gas self-calibration flow designs a hierarchical alarm mode, and there are 5 alarm conditions:
firstly, when the standard gas pressure is smaller than a first threshold value and is smaller than the last standard gas pressure by a second threshold value, alarming to prompt that the standard gas pressure is abnormal and prompt the prompt level to be strong;
secondly, when the preheating is stable and overtime, the alarm prompts that the preheating is overtime and the prompt level is strong;
thirdly, when the maximum calibration times are reached and the relative standard deviation still does not meet the parameter setting requirement, alarming to prompt that the standard gas repeatability is abnormal and the prompt level is weak;
fourthly, when the deviation between the standard gas detection retention time and the first standard does not meet the parameter setting requirement, alarming to prompt that the retention time is abnormal and prompt the grade to be weak;
fifthly, when the concentration of the standard gas component or the peak height/peak area exceeds the parameter setting requirement, alarming to prompt that the standard gas concentration is abnormal and prompt the grade to be strong.
In this embodiment, the above-mentioned standard gas self-calibration flow designs a data correction mode, which specifically includes:
when the deviation between the retention time of the calibrated gas component and the first calibration exceeds the parameter setting requirement, the system automatically modifies the retention time to be consistent with the last retention time;
when the relative standard deviation of a certain calibration component concentration or peak height/peak area and the last calibration data is between the fifth threshold value and the seventh threshold value and the relative standard deviation of the first calibration data is between the sixth threshold value and the eighth threshold value, the modification of the standard curve coefficient is automatically carried out.
Example 2
As shown in fig. 3, this embodiment provides a standard gas self-calibration system of an online monitoring device for dissolved gas in insulating oil, which implements the standard gas self-calibration method described in embodiment 1, and includes a gas source module, a gas path module and a control module.
In the embodiment, the gas source module comprises a standard gas steel cylinder 1, a pressure sensor 2 and a gas pressure reducing valve 3; the gas outlet of the standard gas steel cylinder 1 is connected with a gas pressure reducing valve 3, and a pressure sensor 2 is arranged between the standard gas steel cylinder 1 and the gas pressure reducing valve 3;
the standard gas steel cylinder 1 is filled with standard mixed gas, the standard mixed gas takes nitrogen as base gas, and methane, ethylene, ethane, acetylene, hydrogen, carbon monoxide and carbon dioxide with known concentrations are mixed;
alternatively, the other gas concentration ranges are: methane 30 mu L/L to 200 mu L/L, ethylene 30 mu L/L to 200 mu L/L, ethane 30 mu L/L to 200 mu L/L, acetylene 10 mu L/L to 100 mu L/L, hydrogen 200 mu L/L to 1000 mu L/L, carbon monoxide 300 mu L/L to 2500 mu L/L, and carbon dioxide 1000 mu L/L to 4000 mu L/L.
Alternatively, the standard gas cylinder 1 has a volume of 2L to 8L and a standard gas filling pressure of 10.5MPa.
In this embodiment, the gas path module includes a breather pipe and a gas marking valve 4, where the breather pipe is connected with the gas pressure reducing valve 3, the carrier gas module, the degassing module and the detection module of the dissolved gas on-line monitoring device;
a standard gas valve 4 is arranged among the gas pressure reducing valve 3, the carrier gas module, the detection module and the degassing module, the standard gas valve 4 is respectively connected and communicated with the gas pressure reducing valve 3, the carrier gas module, the detection module and the degassing module, and the control module is used for controlling the conduction of the standard gas valve 4 so that the standard gas of the gas source module or the sample gas of the degassing module enters the detection module;
when the oil sample is required to be detected, the air marking valve is in a state that the degassing module is communicated with the detection module; when the standard gas is required to be marked, the standard gas valve is in a state that the gas source module is communicated with the detection module.
In this embodiment, the control module performs automatic control on all the electrical elements through a lower computer program, including functions such as a standard gas self-calibration process, standard gas monitoring, alarm function, parameter modification, and the like.
In this embodiment, the system and method for self-calibration of the target gas are verified. The method is characterized in that a standard gas self-calibration system is additionally arranged on an online monitoring device for dissolved gas in insulating oil, 30L of the standard gas self-calibration system is prepared to be capable of stably storing reference oil samples for more than 7 days, and offline chromatographic detection is carried out every day to ensure that the concentration of the oil samples is basically unchanged, wherein the concentration of the oil samples and the concentration of the standard gas are shown in a table 1:
TABLE 1 oil sample and target gas concentrations
The device oil sample monitoring period is set to be 4 hours, the oil sample measurement period is set to be 6 times for calibration, the device runs continuously for 5 days, the total operation is 5 times for self calibration of the oil sample, the operation data are shown in fig. 4, the result shows that the system and the flow run normally, the oil sample monitoring and the oil sample calibration data are stable, and no cross interference exists between the oil sample and the oil sample.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. The standard gas self-calibration method of the on-line monitoring device for the dissolved gas in the insulating oil is characterized by comprising the following steps of:
continuous gas calibration is carried out under the normal condition of the gas calibration pressure;
determining the relative standard deviation of the gas component concentration or peak height/peak area under continuous gas calibration, if the relative standard deviation is not smaller than a set threshold value, continuing to perform gas calibration until the relative standard deviation is smaller than the set threshold value, and the continuous calibration times do not exceed the maximum calibration times; if the relative standard deviation still does not meet the requirement when the maximum calibration times are reached, triggering a calibration abnormality alarm;
and obtaining the average concentration or peak height/peak area average value of the gas component when the relative standard deviation meets the requirement, comparing the average concentration or peak height/peak area average value with the last calibration data and the first calibration data, and stopping the calibration flow, correcting the gas calibration coefficient or triggering the calibration abnormality alarm according to the comparison result.
2. The method for calibrating the online monitoring device for the dissolved gas in the insulating oil according to claim 1, wherein the method is characterized in that whether the standard gas pressure is normal is judged, if the standard gas pressure is smaller than a first threshold value and is smaller than the last standard gas pressure by a second threshold value, the standard gas pressure is abnormal, an alarm prompt is triggered, and the calibration process is terminated; otherwise, continuous gas calibration is carried out under the normal condition of the gas calibration pressure.
3. The method for calibrating the gas marking self-calibration of the on-line monitoring device for the dissolved gas in the insulating oil according to claim 1, wherein the single gas marking process comprises the following steps:
according to the gas chromatography detection principle, chromatographic preheating, baseline stabilization, standard gas purging, sample introduction, chromatographic sampling, spectrogram analysis and standard gas component retention time judgment are sequentially carried out;
if the deviation between the target gas component retention time and the first calibration exceeds a third threshold value, the retention time is abnormal and warning is carried out, and the target gas component retention time is modified to be the target gas component retention time currently calibrated; otherwise, ending the single gas calibration.
4. The method for calibrating the gas standard self-calibration of the on-line monitoring device for the dissolved gas in the insulating oil according to the gas chromatography detection principle, wherein the method comprises the steps of firstly carrying out chromatographic preheating, then judging whether a base line is stable or not, and if the base line is not stable and the preheating is not overtime, continuing to carry out chromatographic preheating until the base line is stable;
if the preheating is overtime, whether the base line is stable or not, the preheating is overtime and alarming is carried out, and the calibration flow is terminated;
and if the baseline is stable and the preheating is not overtime, carrying out standard gas purging, sample injection, chromatographic sampling, spectrogram analysis and standard gas component retention time judgment.
5. The method for calibrating a gas self-calibration device for an on-line monitoring device for dissolved gas in insulating oil according to claim 1, wherein the process of comparing the last calibration data with the first calibration data comprises:
if the relative standard deviation of the first calibration data and the last calibration data is not greater than a fifth threshold value, the gas calibration coefficient is not modified when the relative standard deviation of the first calibration data and the last calibration data is not greater than a sixth threshold value, and the calibration process is terminated;
if the relative standard deviation between the first calibration data and the last calibration data is between the fifth threshold value and the seventh threshold value, correcting the standard gas coefficient when the relative standard deviation between the first calibration data and the first calibration data is between the sixth threshold value and the eighth threshold value;
and if the relative standard deviation of the calibration data and the previous calibration data is not smaller than the seventh threshold value, triggering a calibration abnormality alarm when the relative standard deviation of the calibration data and the first calibration data is not smaller than the eighth threshold value, and ending the flow.
6. The method for calibrating a gas-calibrating on-line monitoring device for an insulating oil-soluble gas according to claim 5, wherein the modified gas-calibrating coefficient is a first calibrated concentration or peak height/peak area divided by a current calibrated concentration or peak height/peak area.
7. The utility model provides a dissolved gas on-line monitoring device's mark gas is from calibration system in insulating oil which characterized in that includes: the device comprises an air source module, an air path module and a control module;
the gas source module comprises a standard gas steel cylinder, a pressure sensor and a gas pressure reducing valve, wherein the standard gas steel cylinder is connected with the gas pressure reducing valve, and the pressure sensor is arranged between the standard gas steel cylinder and the gas pressure reducing valve;
the gas circuit module comprises a vent pipe and a gas marking valve, the gas pressure reducing valve is connected with a detection module of the dissolved gas on-line monitoring device through the vent pipe, and the gas marking valve is arranged on the vent pipe;
the control module is used for controlling the conduction of the gas marking valve so as to conduct the gas source module and the detection module when the gas marking is carried out, and the gas marking self-calibration method is carried out according to any one of claims 1-6.
8. The system for calibrating the on-line monitoring device for the dissolved gas in the insulating oil according to claim 7, wherein the standard gas cylinder is filled with standard mixed gas, and the standard mixed gas is mixed with methane, ethylene, ethane, acetylene, hydrogen, carbon monoxide and carbon dioxide gas by taking nitrogen as a base gas.
9. The gas self-calibration system of an on-line monitoring device for dissolved gas in insulating oil of claim 8, wherein each gas concentration range comprises: methane 30 mu L/L-200 mu L/L, ethylene 30 mu L/L-200 mu L/L, ethane 30 mu L/L-200 mu L/L, acetylene 10 mu L/L-100 mu L/L, hydrogen 200 mu L/L-1000 mu L/L, carbon monoxide 300 mu L/L-2500 mu L/L, and carbon dioxide 1000 mu L/L-4000 mu L/L.
10. The system for calibrating the on-line monitoring device for the dissolved gas in the insulating oil according to claim 7, wherein the detection module is further connected with the degassing module through a vent pipe, and the control module controls the gas calibrating valve to be in a state that the degassing module is communicated with the detection module when the oil sample is detected.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117110587A (en) * | 2023-10-25 | 2023-11-24 | 国网四川省电力公司超高压分公司 | Method and system for on-line monitoring abnormality alarm of dissolved gas in oil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110587A (en) * | 2023-10-25 | 2023-11-24 | 国网四川省电力公司超高压分公司 | Method and system for on-line monitoring abnormality alarm of dissolved gas in oil |
| CN117110587B (en) * | 2023-10-25 | 2024-01-23 | 国网四川省电力公司超高压分公司 | Method and system for on-line monitoring abnormality alarm of dissolved gas in oil |
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