summary:

The vehicle mounted insulation oil dissolved gas analysis dedicated gas chromatograph is a product developed by Shanghai Kechuang Chromatography Instrument Co., Ltd. with over ten years of experience in manufacturing insulation oil dissolved gas analysis dedicated gas chromatographs. After more than two years of dedicated research and development, it has recently been introduced to the domestic market

New generation specialized gas chromatograph for analysis of dissolved gases in insulating oil. Suitable for in car use, forming a small liquidity in car testing laboratory. Through touring and on-site rapid analysis, the content of dissolved gas in the insulation oil of large oil filled electrical equipment is detected to monitor the operation status of large power equipment, timely detect signs of equipment accidents, propose equipment maintenance suggestions, and avoid causing significant losses.

The new generation of vehicle mounted specialized gas chromatography for analyzing dissolved gases of insulating oil can fully meet the requirements specified in the national standard GB/T17623-1998. The main technical parameters are basically the same as those of the specialized gas chromatography for analyzing dissolved gases of insulating oil used in previous laboratories such as GC900AD and GC2002AD. Therefore, the new generationVehicle mounted insulation oil dissolved gas analysis special gas phaseThe chromatograph can also be used in the laboratory.

Instrument completeness:

A small flowability in car testing laboratory is composed of a dedicated gas chromatograph for the analysis of dissolved gases in insulating oil, which requires the following supporting equipment:

Technical Specifications:

Detecting the dissolved gas component H in insulating oil₂、O₂、CO、CH₄、CO₂、C₂H₄、C₂H₆And C₂H₂There are eight components in total;

Detecting the dissolved gas component H in insulating oil₂、O₂、N₂、CO、CH₄、CO₂、C₂H₄、C₂H₆And C₂H₂There are nine components in total;

Minimum detectable concentration: H₂≤2ul/L, CO、CO₂≤5ul/L，C₂H₂≤0.10ul/L。

Baseline stability: TCD baseline noise ≤ 0.03mV, baseline drift ≤ 0.06Mv/30min;

FID baseline noise ≤ 1 × 10^－13A, Baseline drift ≤ 6 × 10^－13A/30min；

Quantitative repeatability RSD of component detection ≤ 3%;

Sample chromatographic analysis time ≤ 5 minutes.

Instrument power consumption and recommended power supply for use

1. When the chromatograph is started, the temperature control components are heated, and the power consumption is about 5KW. Each temperature control component is kept at a constant temperature and in normal analysis state, the power consumption is about 0.5KW, and the power consumption of the oscillator is about 0.3KW.
2. It is recommended to use a cable reel and connect an external 220V, 50HZ power supply. If external AC power is not possible, only the 12V battery inside the car can be used, connected to a 2000W sine wave inverter. Attention should be paid to the power matching of the battery. When the battery voltage drops to 10V ± 0.5 V, the car should be started in a timely manner and the battery should be used immediately.

Procedures for mobile, touring, and on-site inspections

1. Select parking and work areas, and connect the cable tray to an external AC power source.
2. Preheat the chromatograph, add bridge flow to TCD, and ignite with FID.
3. Collect oil samples and use an oscillating instrument for degassing (once, two oil samples for degassing);
4. Standard gas analysis, establishment of analysis templates, conducted during idle time, saving templates for immediate use.
5. Oil sample desorption, measurement, chromatographic injection analysis.
6. The gas content analysis report of oil sample components has been obtained, and the preliminary evaluation of equipment operation status has been conducted.

Standard gas analysis

1. The purpose of standard gas analysis is to establish a sample gas analysis template (to determine the peak time of the tested component, to determine the relationship between the amount of component entering the chromatograph and the peak height or peak area of the component - component response value).
2. Standard gas injection method: Place the standard gas in the standard gas cylinder into the gas sampling bag through a pressure reducing valve, draw gas with a 1ul syringe, and inject the sample for chromatography.
3. The standard gas chromatogram is shown in Figure 4.

Figure 4 (1) Chromatogram of Dissolved Gas Eight Component Standard Gas

Figure 4 (2) Standard gas chromatogram of nine components of dissolved gas

Example of Oil Sample Analysis

According to the operating parameters of the oscillator and chromatograph mentioned above, use a vehicle mounted systemGC2010ADAnalyze the oil samples of two transformers in operation using a specialized gas chromatograph for the analysis of dissolved gas in insulating oil. The analysis spectra are shown in Figures 5 and 6. The analysis results are shown in Tables 1 and 2.

Figure 5: Spectrogram of Dissolved Oil Sample Sent by Sichuan Xihua University

Table 1 Dissolved Gas Content of Oil Samples from Sichuan Xihua University

Number Retention Time Name Concentration (ppm) Peak Area UV. S Peak Height UV

────────────────────────────

1 0.271 H2 981.42 45414 12159

2 0.631 O2 110.93 4221 784

3 1.340 CH4 3.35 606 188

4 1.094 CO 257.03 117080 31945

5 2.606 CO2 5577.83 368575 61001

6 3.438 C2H4 9.07 523 50

7 4.159 C2H6 5.99 180 28

8 4.967 C2H2 8.27 266 13

Figure 6 Dissolved color spectrum of Chengdu Hualin oil sample

Table 2 Dissolved Gas Content of Chengdu Hualin Oil Sample

Number Retention Time Name Concentration (ppm) Peak Area UV. S Peak Height UV

────────────────────────────

1 0.331 H2 111.46 886 276

2 0.627 O2 1722.75 17966 3219

3 1.355 CH4 10.39 898 213

4 1.105 CO 214.80 22270 5329

5 2.612 CO2 2017.29 129408 21227

6 3.432 C2H4 2.94 250 17

7 4.260 C2H6 1.79 121 17

8 5.130 C2H2 3.29 112 14

────────────────────────────

Conclusion

vehicle-mountedGC2010ADThe successful development of a specialized gas chromatograph for the analysis of dissolved gas in insulating oil is a great blessing for the power industry. From then on, the analysis of dissolved gas in insulating oil has broken away from the old method of on-site sampling and laboratory analysis, and can be carried out in various places for on-site sampling and analysis, obtaining analysis results immediately.

It can effectively solve the current practical problems of long offline analysis time, slow response, untimely analysis data, and immature, unstable, expensive, and inconvenient maintenance of online analysis equipment technology in the laboratory.