Calculation method for analysis constant of dissolved gas in transformer oil
A dissolved gas analysis and dissolved gas technology, applied in the field of detection, can solve problems such as error-prone, complicated calculation process, accurate and reliable analysis results affecting the content of dissolved gas in transformer oil, etc.
Pending Publication Date: 2022-06-24
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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Problems solved by technology
Since temperature, atmospheric pressure, etc. are involved in the calculation, the calculation process is complicated and error-prone, which affects the accurate and reliable analysis results of the dissolved gas content in the transformer oil
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Embodiment Construction
[0045] The calculation method of the dissolved gas analysis constant in the transformer oil of the present invention comprises the following steps:
[0046] Step 1: Use the standard mixed gas to perform detection, select two standard gas samples that meet the repeatability requirements of the standard gas, and calculate the average value of the peak areas of each component of the two standard gas samples;
[0047] Step 2. Based on the degassing principle of headspace chromatography, in the closed system composed of the oil sample and degassing under the condition of constant temperature and pressure, the dissolved gas in the oil sample reaches the distribution equilibrium between the gas and liquid phases. According to the distribution law and According to the principle of material balance, the concentration of each component of dissolved gas in the oil sample is derived,
[0048]
[0049]
[0050] where:
[0051] K i is the distribution coefficient of the dissolved ga...
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The invention discloses a method for calculating analysis constants of dissolved gas in transformer oil, which comprises the following steps of: selecting two standard gas samples meeting standard gas repeatability requirements, and calculating an average value of peak areas of components of the two standard gas samples; the dissolved gas in the oil sample achieves distribution balance in gas-liquid two phases, and the concentration of each component of the dissolved gas in the oil sample is exported; analyzing the dissolved gas in the transformer oil by using a gas chromatography method, and recording the degassing amount of the gas in the oil sample; establishing a transformer oil chromatographic analysis constant table according to the environment temperature, the atmospheric pressure and the concentration value of the standard gas during the test, and calculating a response factor; and calculating the concentration value of each gas component in the oil sample through the response factor according to the degassing amount of each oil sample and a transformer oil chromatographic analysis constant table. According to the method, the analysis constants of the dissolved gas in the transformer oil are established, the response factors of all the components are calculated, the calculation process is simplified, automatic calculation is achieved, and the accuracy and reliability of analysis data are ensured.
Description
technical field [0001] The invention relates to the technical field of detection, in particular to a method for calculating the analytical constant of dissolved gas in transformer oil. Background technique [0002] Transformer is an important key equipment in the power grid. The internal fault of oil-immersed transformer can lead to changes in the type and concentration of dissolved gas in transformer oil. The mechanism of dissolved gas in oil can be used to diagnose whether there are discharge faults and thermal faults inside the transformer. Dissolved gas analysis in transformer oil is a very effective method for diagnosing latent faults of oil-immersed transformers, and plays an important role in realizing the maintenance of transformer operating conditions. Therefore, regular monitoring of dissolved gas in transformer oil can ensure long-term safe and reliable operation of the power grid. [0003] The method used for the detection and degassing of dissolved gas in trans...
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IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 张莹
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE