Inflatable Ring Main Unit Assembly Line

The main assembly reference processes and testing key points of the inflatable ring main unit (RMU) assembly line include the following aspects:

1. Preparation before assembly:
   • Ensure that the specifications of all components and materials match the design requirements.
   • Check the cleanliness of the assembly area to ensure a dust-free environment and avoid contamination during the assembly process.
2. Installation of primary components:
   • According to the design drawings and process requirements, install the primary components (such as circuit breakers, isolators, etc.) in place.
   • Ensure all connections are tightened and aligned to avoid damage during the assembly process.
3. Welding and sealing:
   • Perform precise welding on parts that require it, ensuring the quality of the welds.
   • After welding, use a helium leak detection device to test for leaks and ensure the integrity of the seal.
4. SF6 gas filling:
   • After assembly is complete, fill the RMU with SF6 gas to the specified pressure.
   • Monitor the purity and moisture content of the gas during filling to ensure it meets technical standards.
5. Electrical connections and testing:
   • Complete all electrical connections and conduct necessary electrical tests, such as insulation resistance tests and voltage withstand tests.
   • Check for any overheating at connection points to ensure electrical safety.
6. Functional testing:
   • Conduct functional tests on the assembled RMU, including the flexibility of switch operations and the reliability of mechanical interlocks.
   • Verify that the performance indicators of the RMU meet the design requirements and relevant standards.
7. Environmental adaptability testing:
   • Conduct environmental adaptability tests such as high temperature, low temperature, and high altitude tests based on the operating conditions of the RMU.
   • Ensure the RMU can operate stably under various environmental conditions.
8. Final inspection before delivery:
   • Perform a final visual inspection and cleaning of the assembled RMU.
   • Confirm the completeness and accuracy of all documentation, labels, and markings.