1、 Introduction to Analysis of Dissolved Gas in Transformer Oil:
GC2002 Transformer Oil (Insulation Oil) Dissolved Gas Analysis Special Gas Chromatography Instrument is a power specific gas chromatography instrument designed and manufactured in accordance with national standards. Dissolved gas (H)2、 CO、CO2、 CH4、 C2H4、 C2H6、 C2H2）The analysis adopts a mature scheme of one-time injection, dual column parallel connection, and three detector detection. If it is necessary to detect the content of O2 and N2, a nine component configuration scheme can be selected.
2、 Main technical indicators
1. Minimum detectable concentration of gas
| Components | H2 | CO | CO2 | CH4 | C2H4 | C2H6 | C2H2 |
| Minimum concentration μ L/L | 2 | 0.5 | 0.5 | 0.05 | 0.05 | 0.05 | 0.05 |
2. Execution standards
⇒ DL/T703-2015 Gas Chromatography Method for Determination of Gas Content in Insulating Oil
⇒ GB/T7252-2001, DL/T722-2014 Guidelines for Analysis and Determination of Dissolved Gases in Transformer Oil
GB/T17623-1998 Determination of dissolved gas components in insulating oil by gas chromatography
3. Detector indicators
| detector | Sensitivity/Detection Limit | Baseline noise | Baseline drift | Linear range | Stable time |
| TCD | ≥ 3500 mv · ml/mg (benzene) | ≤10μv | ≤60μv/30min | 105 | ≤1h |
| FID | 1.0 pg/s(n-C16) | ≤5μv | ≤50μv/30min | 107 | ≤30min |
4. Instrument Introduction Parameters
The human-computer interaction interface of 4.1 and 5.7-inch color touch screens is intuitive and easy to understand;
4.2. A fully computerized reverse control system, with a single computer capable of controlling up to 253 chromatography instruments and 7 temperature control channels; 8-channel external event time program;
4.3. Equipped with a dedicated workstation for analyzing dissolved gases in power transformer oil, it can integrate effective parts of multi-channel spectra for convenient spectrum processing. It can generate trend curves of the content of various gas components at the same sampling point over time, and automatically provide three ratio codes, fault properties, and typical examples in the report;
4.4. The instrument adopts RJ45 Ethernet interface, which makes signal output and control acquisition simple and convenient, and can realize remote control, remote data transmission, processing and supervision of the instrument. Can be connected to unit supervisors and higher-level supervisors for easy supervision by supervisors;
4.5. Equipped with a dedicated independent balanced gas intake port, gas intake oscillation will not affect analysis.
4.6. Adopting transformer oil specific anti pollution composite chromatography column technology, the service life of the chromatography column is longer.
4.7. Large capacity column box with automatic rear opening door, capable of 8-step programmed heating, and column box with near room temperature control function (5 ℃ above room temperature);
4.8. Equipped with fault self diagnosis function, displaying the location and nature of the fault at any time; Equipped with over temperature protection function, any temperature exceeding the set temperature will automatically stop heating.
5. Other parameters
5.1 Instrument temperature control parameters
Number of temperature control interfaces: 7
Temperature control range: Room temperature+5 ℃~400 ℃
Temperature control accuracy/stability: ≤ 0.5%
Display accuracy: 0.1 ℃
Program heating up:
Number of promotion orders: 8 orders
Cheng Sheng rate: 0~39.9 ℃/min (adjustable increment of 0.1 ℃/min)
Cheng Sheng's repeatability stability: ≤ 0.5%
Cooling rate: ＜ 9 minutes (from 300 ℃ to 50 ℃) (automatic rear door opening)
5.2. Number of external event interfaces: 8
5.3 Column box volume: 180 × 280 × 280mm (depth × width × height)
5.4. Host size: 650 × 480 × 500mm (length × width × height)
5.5. Instrument weight: approximately 53kg
5.6 Power: Approximately 2000W
3、 Workstation interface
1. Graph collection interface
2. Graph processing interface
Integration of multispectral images into single spectrograms through swapping
Parameter setting in oscillation method
4、 Instrument analysis spectrum
1. Analysis of Seven Components in Dissolved Gas of Transformer Oil (Insulation Oil)
Instrument model: GC2002N/AD
Analysis conditions:
Column box: 50 ℃ Vaporization chamber: 80 ℃ Detector: 160 ℃ Converter: 370 ℃
Column front pressure: 0.1Mpa Hydrogen pressure: 0.02Mpa Air pressure: 0.03Mpa
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Serial number, retention time, name, concentration, peak area, peak height
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1 0.308 H2 953.00 35074 10194
2 1.093 CO 662.00 55264 5634
3 4.158 CO2 2675.00 225674 5785
4 7.249 CH4 94.50 88383 36066
5 9.349 C2H4 94.50 182564 27053
6 10.066 C2H6 94.50 188439 21045
7 10.649 C2H2 95.10 153681 16220
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Total hydrocarbon concentration: 378.60