Detailed information of SP-3430 transformer oil dedicated gas chromatograph:
1、 Determination of dissolved gas component content in insulating oil
The determination of dissolved gas content in insulating oil by gas chromatography is an effective means to determine whether there are latent overheating, discharge and other faults in oil filled power equipment during operation, in order to ensure the safe and effective operation of the power grid. It is also a necessary means for oil filled electrical equipment manufacturers to conduct factory inspections of their equipment.
The transformer oil specific gas chromatograph adopts a unique single column process system, which can complete the full analysis of dissolved gas components (including hydrogen, oxygen, methane, ethylene, ethane, acetylene, carbon monoxide, and carbon dioxide) in insulation oil with one injection. According to the national standard, the dissolved gas in the insulation oil sample is extracted, separated by a chromatographic column, detected by a chromatographic detector, and then analyzed and managed through a dedicated chromatographic workstation. This method meets the requirements for gas chromatography in the national standard GB/T 17623-1998 "Determination of dissolved gas components in insulating oil by gas chromatography" and the power industry standard DL/T 722-2000 "Guidelines for analysis and determination of dissolved gases in transformer oil".

2、 Determination of gas content in insulating oil
The gas content of insulating oil is an important indicator for oil quality supervision. At present, the carbon dioxide elution method developed according to the DL/T450-1991 method is only applicable to the determination of oil products without acidic gases, while the vacuum pressure difference method developed according to the DL/T423-91 method has certain limitations due to the difficulty in popularizing vacuum instruments.
The process design of the transformer oil specific gas chromatograph fully complies with the provisions of the chromatographic process design in the power industry standard DL/T 703-1999 "Gas Chromatography Determination of Gas Content in Insulating Oil" of the People's Republic of China. The machine is equipped with a high-sensitivity thermal conductivity detector and a hydrogen flame ionization detector, as well as a nickel catalyst converter, which can achieve the complete determination of five gas components dissolved in transformer oil: hydrogen, oxygen, nitrogen, carbon monoxide, and carbon dioxide. Its performance meets the requirements of gas chromatography in DL/T 703-1999 "Gas Chromatography Method for Determination of Gas Content in Insulating Oil".
■ Instrument flow chart

■ Instrument configuration
1 GC-3430 Transformer Oil Special Gas Chromatography Instrument
2. Flame ionization detector (FID)
3. High sensitivity thermal conductivity detector (TCD)

4 Power Transformer Oil Special Workstation

Instrument performance of transformer oil specific gas chromatograph
One injection, with a sample volume of 1 mL, the minimum detectable concentration in the oil actually reached:

Analysis of dissolved gases (uL/L)
H2COCO2CH4C2H4C2H6C2H2
10.50.50.010.010.010.1

Example of Analysis of Dissolved Gas Component Content

Chromatographic analysis conditions
1. Determination of components: H2、O2、CO、CO2、CH4、C2H4、C2H6、C2H2
Chromatograph (power distribution dedicated workstation)
Auxiliary equipment: high-purity nitrogen, high-purity hydrogen, dry air, degassing device.
Chromatographic Column: Specialized Chromatographic Column
Measurement conditions: Column temperature 60 ℃, vaporization chamber 60 ℃, detector 120 ℃
Thermal conductivity temperature 70 ℃, converter temperature 360 ℃, FID range: 109
TCD current: 70mA
2. Standard gas component content (unit: μL/ L）
H2: 1008 O2: 5.41% CO: 712 CO2:3016 CH4:101
C2H4:101 C2H6:99 C2H2:48