CN110927273A - Chromatographic analysis and determination method for dissolved gas in transformer oil - Google Patents
Chromatographic analysis and determination method for dissolved gas in transformer oil Download PDFInfo
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Abstract
The invention discloses a chromatographic analysis and determination method for dissolved gas in transformer oil, which comprises the steps of carrying out chromatographic analysis and detection on the dissolved gas in an acquired oil sample according to a standard determination method, recording the degassing amount of the acquired oil sample, taking the oil sample subjected to first detection and degassing as a sample for second oil sample detection after the analysis and detection of the dissolved gas in the acquired oil sample fails, carrying out second oil sample detection according to the standard determination method, and calculating the concentration content of the dissolved gas in the second oil sample; according to the concentration content of the dissolved gas in the second oil sample, obtaining the concentration content of the dissolved gas in the first degassed oil sample; and calculating to obtain the concentration content of the dissolved gas in the collected oil sample by combining the concentration content of the dissolved gas detected twice. According to the method, the content of the dissolved gas in the collected oil sample is obtained through correlation calculation, single oil sample detection is realized, the detection operation efficiency is improved, and effective and reliable detection of the dissolved gas in the transformer oil is ensured.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a chromatographic analysis and determination method for dissolved gas in transformer oil.
Background
The modern industrial production can not be separated from the electric energy provided by a power grid, a transformer is an important key device in the power grid, the type and concentration of dissolved gas in transformer oil can be changed due to internal faults of an oil-immersed transformer, and whether discharging faults and thermal faults exist in the transformer can be diagnosed by utilizing a generation mechanism of the dissolved gas in the transformer oil. Analysis of dissolved gas in oil is a very effective method for diagnosing latent faults of the oil-immersed transformer, and plays an important role in realizing operation state maintenance of the transformer. Therefore, the dissolved gas in the transformer oil is regularly monitored, and long-term safe and reliable operation of a power grid can be guaranteed.
The off-line detection method for degassing of dissolved gas in transformer oil is a mechanical oscillation method based on the principle of dissolution balance, and the gas detection adopts hydrogenFlame detectors (FID) or Thermal Conductivity Detectors (TCD). The oscillation degassing method is convenient to operate and good in repeatability, and the obtained analysis result can reflect the content of all dissolved gases in the oil. The hydrogen flame detector (FID) has the advantages of high sensitivity to almost all organic substances, especially hydrocarbon compounds, and the response value is proportional to the number of carbon atoms and is proportional to H2O、CO2The inorganic substances are not sensitive to gas flow rate, pressure and temperature change; and its linear range is wide, simple in construction, easy to operate. The Thermal Conductivity Detector (TCD) responds to all substances, and has the advantages of simple structure, reliable performance, accurate quantification, low price, durability and non-destructive property. Meanwhile, the instrument is calibrated every day for off-line detection, so that the detection result is accurate and reliable under the condition of strictly operating according to the regulations.
At present, a laboratory carries out daily detection according to 'gas chromatography determination method for content of dissolved gas components in insulating oil GB/T17623', but the condition that oil samples are few and are not enough for double-sample detection is often met in daily work, or the detection failure condition is caused by various reasons after single-sample detection is carried out, and the first degassing detection failure condition, the traditional method is that the transformer oil is required to be sampled on site again, the detection workload is greatly improved, the detection operation efficiency is reduced, and the effective and reliable detection of the dissolved gas in the transformer oil is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a chromatographic analysis and determination method for dissolved gas in transformer oil, which avoids the limitations that a sample must be taken again after the first degassing detection fails and double-sample analysis cannot be carried out due to less samples, implements secondary degassing detection on an oil sample, obtains the content of the dissolved gas in the oil sample through related calculation, realizes single-oil-sample detection, improves the detection operation efficiency, and ensures effective and reliable detection of the dissolved gas in the transformer oil.
In order to solve the technical problem, the chromatographic analysis and determination method for the dissolved gas in the transformer oil comprises the following steps:
step one, collecting a transformer oil sample, carrying out chromatographic analysis detection on dissolved gas in the collected oil sample according to a GB/T17623 determination method, recording degassing amount of the collected oil sample, and executing step two after analysis detection of the dissolved gas in the collected oil sample fails;
step two, taking the degassed oil sample after the first detection as a sample for the second oil sample detection, carrying out the second oil sample detection according to the GB/T17623 determination method, and calculating the concentration content of the dissolved gas in the second oil sample;
step three, calculating the concentration content of the dissolved gas in the oil sample subjected to first degassing according to the concentration content of the dissolved gas in the second oil sample;
and step four, calculating to obtain the concentration content of the dissolved gas in the collected oil sample according to the concentration content of the dissolved gas in the oil sample subjected to the first degassing and the concentration content of the dissolved gas in the oil sample subjected to the second degassing.
Further, when the analysis and detection of the dissolved gas in the collected oil sample fails, the volume V of the oil sample at room temperature of 20 ℃ after the oil sample is balanced is recorded1And degassing amount Vg, converted to gas volume and oil sample volume at 50 ℃:
Vl'＝Vl[1+C×(50-t)](2)
in the formula: v'gAt 50 ℃ and test pressure, equilibrium gas volume, VgIs the equilibrium gas volume at room temperature t, test pressure, Vl' oil sample volume at 50 ℃, VlCollecting the volume of an oil sample at room temperature t, wherein t is the temperature during the test, C is the thermal expansion coefficient of the oil, and 0.0008 is taken;
setting the concentration content of the dissolved gas in the second oil sample to be X'iThe concentration content of the dissolved gas in the second oil sample is the concentration content C of the dissolved gas in the first degassed oil sampleilI.e. Cil＝X'iThen, obtaining:
Cig＝Cil/Ki(3)
in the formula, CigThe concentration of component i dissolved in the gas under equilibrium conditions, CilThe concentration of component i dissolved in the liquid under equilibrium conditions, KiThe distribution coefficient of the dissolved gas component i after gas-liquid equilibrium at the test temperature;
collecting the concentration X of component i of dissolved gas in an oil sampleiThe calculation formula of (2) is as follows:
Xi＝Cig×(Ki+Vg/Vl) (4)
substituting formula (3) for formula (4) to yield:
considering the temperature and pressure conditions of the test, i.e., 50 ℃ converted to 20 ℃ under the equilibrium oscillation condition and the atmospheric pressure P, the formula (5) becomes:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×(V'g/Vl') (6)
substituting formula (1) and formula (2) for formula (6) yields:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×[Vg×323/(273+t)]/{Vl×[1+0.0008×(50-t)]} (7)
and obtaining the concentration of the component i of the dissolved gas in the collected oil sample.
The chromatographic analysis and determination method for the dissolved gas in the transformer oil adopts the technical scheme, namely the method performs chromatographic analysis and detection on the dissolved gas in the collected oil sample according to a standard determination method, records the degassing amount of the collected oil sample, takes the degassed oil sample detected for the first time as a sample for the second time of oil sample detection after the analysis and detection of the dissolved gas in the collected oil sample fails, performs the second time of oil sample detection according to the standard determination method, and calculates the concentration content of the dissolved gas in the second time of oil sample; according to the concentration content of the dissolved gas in the second oil sample, obtaining the concentration content of the dissolved gas in the first degassed oil sample; and calculating to obtain the concentration content of the dissolved gas in the collected oil sample by combining the concentration content of the dissolved gas detected twice. The method avoids the limitation that the re-sampling is needed after the first degassing detection fails and the double-sample analysis cannot be carried out due to less samples, carries out the secondary degassing detection on the oil sample, obtains the content of the dissolved gas in the oil sample through related calculation, realizes the single-oil-sample detection, improves the detection operation efficiency, and ensures the effective and reliable detection of the dissolved gas in the transformer oil.
Detailed Description
The chromatographic analysis and determination method for the dissolved gas in the transformer oil comprises the following steps:
step one, collecting a transformer oil sample, carrying out chromatographic analysis detection on dissolved gas in the collected oil sample according to a GB/T17623 determination method, recording degassing amount of the collected oil sample, and executing step two after analysis detection of the dissolved gas in the collected oil sample fails;
step two, taking the degassed oil sample after the first detection as a sample for the second oil sample detection, carrying out the second oil sample detection according to the GB/T17623 determination method, and calculating the concentration content of the dissolved gas in the second oil sample;
step three, calculating the concentration content of the dissolved gas in the oil sample subjected to first degassing according to the concentration content of the dissolved gas in the second oil sample;
and step four, calculating to obtain the concentration content of the dissolved gas in the collected oil sample according to the concentration content of the dissolved gas in the oil sample subjected to the first degassing and the concentration content of the dissolved gas in the oil sample subjected to the second degassing.
Preferably, when the analysis and detection of the dissolved gas in the collected oil sample fails, the volume V of the oil sample at room temperature of 20 ℃ after the oil sample is balanced is recorded1And degassing amount Vg, converted to gas volume and oil sample volume at 50 ℃:
Vl'＝Vl[1+C×(50-t)](2)
in the formula: v'gAt 50 ℃ and test pressure, equilibrium gas volume, VgIs the equilibrium gas volume at room temperature t, test pressure, Vl' oil sample volume at 50 ℃, VlCollecting the volume of an oil sample at room temperature t, wherein t is the temperature during the test, C is the thermal expansion coefficient of the oil, and 0.0008 is taken;
setting the concentration content of the dissolved gas in the second oil sample to be X'iThe concentration content of the dissolved gas in the second oil sample is the concentration content C of the dissolved gas in the first degassed oil sampleilI.e. Cil＝X'iThen, obtaining:
Cig＝Cil/Ki(3)
in the formula, CigThe concentration of component i dissolved in the gas under equilibrium conditions, CilThe concentration of component i dissolved in the liquid under equilibrium conditions, KiThe distribution coefficient of the dissolved gas component i after gas-liquid equilibrium at the test temperature;
collecting the concentration X of component i of dissolved gas in an oil sampleiThe calculation formula of (2) is as follows:
Xi＝Cig×(Ki+Vg/Vl) (4)
substituting formula (3) for formula (4) to yield:
considering the temperature and pressure conditions of the test, i.e., 50 ℃ converted to 20 ℃ under the equilibrium oscillation condition and the atmospheric pressure P, the formula (5) becomes:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×(V'g/Vl') (6)
substituting formula (1) and formula (2) for formula (6) yields:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×[Vg×323/(273+t)]/{Vl×[1+0.0008×(50-t)]} (7)
and obtaining the concentration of the component i of the dissolved gas in the collected oil sample.
In the method, the concentration X of the component i of the dissolved gas in the oil sample is collectediWith the concentration C of component i of the dissolved gas in the gas at equilibrium conditions of the testigThe relation between the two phases is based on the headspace chromatographic degassing principle of a standard determination method, the dissolved gas in the oil sample is distributed and balanced in gas phase and liquid phase in a closed system formed by the oil sample and the degassing under the conditions of constant temperature and constant pressure, and the concentration of each component of the dissolved gas in the oil sample is derived according to the distribution law and the material balance principle, wherein:
Ki＝Cil/Cig
thereby obtaining the basic formula (3) and the basic formula (4) of the method.
According to the method, through two-step determination of chromatographic analysis of the dissolved gas in the transformer oil, after the gas in the transformer oil is degassed for the first time and fails to be detected, the second degassing detection is carried out, and the content concentration of the dissolved gas in the transformer collected oil sample is obtained by adding the gas concentration in the second oil to the calculated first oil gas concentration. The diagnosis of latent faults of the transformer is realized, so that the long-term safe and reliable operation of the power grid is ensured.
Claims (2)
1. A chromatographic analysis and determination method for dissolved gas in transformer oil is characterized by comprising the following steps:
step one, collecting a transformer oil sample, carrying out chromatographic analysis detection on dissolved gas in the collected oil sample according to a GB/T17623 determination method, recording degassing amount of the collected oil sample, and executing step two after analysis detection of the dissolved gas in the collected oil sample fails;
step two, taking the degassed oil sample after the first detection as a sample for the second oil sample detection, carrying out the second oil sample detection according to a GB/T17623 determination method, and calculating the concentration content of the dissolved gas in the second oil sample;
step three, calculating the concentration content of the dissolved gas in the oil sample subjected to first degassing according to the concentration content of the dissolved gas in the second oil sample;
and step four, calculating to obtain the concentration content of the dissolved gas in the collected oil sample according to the concentration content of the dissolved gas in the oil sample subjected to the first degassing and the concentration content of the dissolved gas in the oil sample subjected to the second degassing.
2. The method for chromatographic analysis and determination of dissolved gas in transformer oil according to claim 1, characterized in that: when the analysis and detection of the dissolved gas in the collected oil sample fails, the volume V of the oil sample at room temperature of 20 ℃ after the oil sample is balanced is recorded1And degassing amount Vg, converted to gas volume and oil sample volume at 50 ℃:
Vl'＝Vl[1+C×(50-t)](2)
in the formula: v'gAt 50 ℃ and test pressure, equilibrium gas volume, VgIs the equilibrium gas volume at room temperature t, test pressure, Vl' oil sample volume at 50 ℃, VlCollecting the volume of an oil sample at room temperature t, wherein t is the temperature during the test, C is the thermal expansion coefficient of the oil, and 0.0008 is taken;
setting the concentration content of the dissolved gas in the second oil sample to be X'iThe concentration content of the dissolved gas in the second oil sample is the concentration content C of the dissolved gas in the first degassed oil sampleilI.e. Cil＝X'iThen, obtaining:
Cig＝Cil/Ki(3)
in the formula, CigThe concentration of component i dissolved in the gas under equilibrium conditions, CilThe concentration of component i dissolved in the liquid under equilibrium conditions, KiThe distribution coefficient of the dissolved gas component i after gas-liquid equilibrium at the test temperature;
collecting the concentration X of component i of dissolved gas in an oil sampleiThe calculation formula of (2) is as follows:
Xi＝Cig×(Ki+Vg/Vl) (4)
substituting formula (3) for formula (4) to yield:
considering the temperature and pressure conditions of the test, i.e., 50 ℃ converted to 20 ℃ under the equilibrium oscillation condition and the atmospheric pressure P, the formula (5) becomes:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×(Vg'/Vl') (6)
substituting formula (1) and formula (2) for formula (6) yields:
Xi＝Xi'+0.929×(P/101.3)×(Xi'/Ki)×[Vg×323/(273+t)]/{Vl×[1+0.0008×(50-t)]} (7)
and obtaining the concentration of the component i of the dissolved gas in the collected oil sample.
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Cited By (4)
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| CN112304802A (en) * | 2020-11-22 | 2021-02-02 | 西安热工研究院有限公司 | Method for testing gas content of sealing oil |
| CN112305128A (en) * | 2020-11-19 | 2021-02-02 | 山东电力研究院 | Low-concentration transformer oil chromatographic secondary degassing analysis method |
| CN112630326A (en) * | 2020-12-02 | 2021-04-09 | 南通醋酸纤维有限公司 | Method for measuring content of dissolved gas organic matters in liquid |
| CN114660185A (en) * | 2020-12-22 | 2022-06-24 | 宝武装备智能科技有限公司 | Method for calculating analysis constant of dissolved gas in transformer oil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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