Inflatable Ring Main Unit Assembly Line

Gas Insulated Switchgear (GIS) Assembly line
Ring Main Unit (RMU) components assembly line and testing

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.

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