**I. Management Regulations**
According to the GDW 168-2008 "Power Transmission and Transformation State Inspection Test Procedures," SF6 gas composition analysis can be carried out selectively when there is an issue with the quality of the SF6 gas or during accident investigations. This procedure helps ensure the safe and reliable operation of electrical equipment by identifying potential problems early.
**II. Working Principle**
During the operation of SF6 electrical equipment, partial discharges caused by various insulation defects lead to the formation of different decomposition products. These include sulfides such as SOâ‚‚, Hâ‚‚S, SOFâ‚‚, SFâ‚„, and SOâ‚‚Fâ‚‚; fluorides like HF, CFâ‚„, and metal fluorides; and carbides such as CO, COâ‚‚, and low-molecular hydrocarbons. The SF6 component analyzer detects these decomposition products, helping determine the type, nature, severity, and progression of insulation issues. This data is crucial for condition monitoring and fault detection in SF6 electrical equipment.
**III. Test Standard**
**IV. Test Procedure**
1. **Preparation:**
- Gather all necessary tools and materials, including one set of SF6 gas decomposition product tester, test pipes, and a combination tool.
- Check the power supply before starting work. If the battery is low, charge it immediately.
- Ensure the transition adapter is complete and properly sealed.
2. Upon arriving at the test site:
- Turn on the instrument’s power switch. It will calibrate automatically, which usually takes about 10 minutes.
- Connect the air outlet pipe and direct it to a safe, unmanned area. Close the regulating valve on the instrument panel.
3. Select the appropriate adapter that matches the equipment.
- Connect the intake pipe to the adapter first, then connect the adapter to the device under test.
4. Once in the measurement interface, click the “Start†button to begin the test.
5. Slowly open the flow regulator and maintain a flow rate between 0.2 to 0.3 L/min.
6. After a few minutes, the instrument will check if the readings are stable (within a certain fluctuation range). It will automatically locate the address twice and allow you to read and save the results once the test is complete.
7. To continue testing, simply connect the adapter to the next device without turning off the instrument.
8. After finishing the test, disconnect the adapter from the equipment and remove the pipes carefully.
9. Perform a sample gas purge to eliminate any residual gas inside the instrument. This prevents internal corrosion and ensures the device remains in good working condition. Finally, turn off the power.
**V. Matters to Note**
1. Before using the instrument, make sure it is fully charged. For long-term storage, keep it charged.
2. When charging, simply plug the power cable into a 220V socket. The instrument will charge automatically without needing to turn on the power switch. A full charge typically takes over 20 hours.
3. If the detected concentrations of SOâ‚‚, Hâ‚‚S, CO, or HF exceed normal levels, re-measure to confirm the results. This helps avoid false positives and ensures accurate data for further analysis.
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