Dissolved gas sampling apparatus and method used in transformer oil gas-chromatography on-line analysis

A sampling device and technology for transformer oil, which are applied to the direct sampling and sampling method and the device used, and the field of gas chromatography sample pretreatment and sampling, which can solve the problems of increasing the cost of the device and the complexity of the operation.

Active Publication Date: 2006-01-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, most online degassing methods use vacuum degassing method or membrane degassing method, which

Method used

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  • Dissolved gas sampling apparatus and method used in transformer oil gas-chromatography on-line analysis
  • Dissolved gas sampling apparatus and method used in transformer oil gas-chromatography on-line analysis
  • Dissolved gas sampling apparatus and method used in transformer oil gas-chromatography on-line analysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: see Fig. 1, blank gas 101 adopts high-purity helium or hydrogen (purity is more than 99.999%), is controlled in 0.1-0.2Mpa scope with pressure-stabilizing valve, is connected in 1 " position of eight-way valve 104, The sample quantitative tube 107 adopts a 3mm I.D.×141.5cm stainless steel tube, 10mL, and is connected with the 2″ and 6″ positions of the eight-way valve 104. The blank gas quantitative tube 106 adopts a 3mm I.D.×283cm stainless steel tube, 20mL, and is connected with the eight-way valve 104. The 4″ and 8″ positions are connected, the 7″ position is connected to the sampling probe 103 through a 1 / 16″ stainless steel tube or quartz capillary tube with an inner diameter of 0.3-0.8mm, and the 3″ position is the vent port, connected to the two-way stop valve 105, 5 The "position" is connected to the micro-oil Dissolved Gas Analyzer (DGA) (2100 SAT type) 111 inlet by quartz capillary 108, and micro-TCD detects. Sampling probe 103 is cylindrical and ...

Embodiment 2

[0044] Embodiment 2: other conditions are the same as embodiment 1. See Fig. 1, the 5 " position of eight-way valve 104 links to each other with the six-way valve of U.S. Varian3800 gas chromatograph through internal diameter 0.2mm, long 300cm quartz capillary 108, FID detects. Sampling probe 103 is a bell jar shape, and volume is 50mL. Realize The simulated on-line analysis of dissolved gas in oil in transformer 201 achieves good separation of 5ppm hydrocarbon gas. The chromatogram is as follows Figure 4 shown. The detection concentration of acetylene can reach 0.1ppm, meeting the requirements of the national standard GB7252-2001.

Embodiment 3

[0045] Embodiment 3: see Fig. 2, blank gas 101 is connected in the 6 " position of ten-way valve 104a, and gas chromatography carrier gas 102 adopts high-purity helium, hydrogen or nitrogen (purity is more than 99.999%), regulates carrying with pressure regulator valve The flow rate of the gas 102 is the stable flow rate under the best separation conditions, connected to the 1″ position of the ten-way valve 104a, and the 2″ position is adjusted through the needle valve 110 to be consistent with the flow rate of the carrier gas 102, and the sample quantitative tube 107 adopts a 0.8mm I.D. ×16cm stainless steel tube, 80 μL, connected to the 5″ and 9″ positions of the ten-way valve 104a, the blank gas metering tube 106 is a 3mm I.D.×283cm stainless steel tube, 20mL, connected to the 3″ and 7″ positions of the ten-way valve 104a, The 8" position is connected to the sampling probe 103 through a 1 / 16" stainless steel tube or quartz capillary tube with an inner diameter of 0.3-0.8mm, ...

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Abstract

The invention relates to a sampling device and method of gas chromatographic online analysis transformer dissolved gas, which comprises sampling probe, temperature sensor, multi-ported valve, sample quantitative pipe, marginal gas quantitative pipe, cutoff valve and marginal gas regulating system. The method directly inserts sampling probe into transformer oil and presses marginal gas into sampling probe by switching of multi-ported valve; the transformer oil is circulated by oil pump so that the dissolved gas of transformer oil can spill into marginal gas and then it achieves gas-liquid equilibrium in probe.

Description

technical field [0001] The invention relates to a gas chromatography on-line monitoring transformer, especially a sample collection technology for dissolved gas in large-scale transformer oil. A direct sampling and sampling method and a device used for gas online collection and one-time injection for quantitative analysis. Background technique [0002] The power transformer is the key equipment of the power system, and its reliability is directly related to the safety and stability of the power system. Under normal operating conditions, the insulating oil and solid insulating materials inside the oil-filled power transformer will gradually age and decompose under the action of thermoelectric stress, producing a small amount of gas. These gases include hydrogen, methane, ethane, acetylene, ethylene, propane, and carbon monoxide and carbon dioxide. The rate at which these gases are produced is accelerated by latent overheating or electrical discharges (arcing, sparking and c...

Claims

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Application Information

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IPC IPC(8): G01N1/14G01N1/10G01N1/28
Inventor 关亚风赵景红刘文民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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