24kv Gas Insulated Ring Main Unit (SF6)

24kv Gas Insulated Ring Main Unit (SF6) Introduction

- 24kv inflation Ring Main Unit series gas cabinet SF6 gas as arc extinguishing and insulation medium.
- The switchgear is fully sealed and fully insulated; Bus bars, switches and live parts are completely enclosed in stainless steel housing.
- The chamber is filled with 1.4bar SF6 gas, the protection level is up to IP67: The whole switch device is completely unaffected by external environmental conditions, even in extreme cases such as short-term flooding can ensure the normal operation of the switch, and the product is maintenance-free for life.
- The switchgear has a perfect "five prevention" interlock device to completely eliminate personnel and equipment operating failures that may be caused by human error.
- All switchgear has a reliable safe pressure relief channel, which can guarantee the personal safety of the operator even in extreme circumstances.
- The switchgear is divided into two categories: fixed unit combination and expandable unit combination.
- The switch cabinet usually enters and exits from the front, and can also be realized by side exit or side expansion according to different installation positions.
- The size of the cabinet is easy to install, and can be suitable for small space and poor environmental conditions.
- The switchgear can be configured with electric, remote control and monitoring devices according to the different needs of users.

1. What is the rated voltage and current of the 24kV SF6 Gas Insulated Ring Main Unit?
   The standard rated voltage is 24kV, with a typical rated current ranging from 630A to 1250A, depending on the configuration.

2. What type of gas is used for insulation, and is it environmentally friendly?
   SF6 (sulfur hexafluoride) gas is used for insulation and arc quenching. While highly effective, SF6 has a high global warming potential (GWP), so proper handling and recycling are essential.

3. What are the key advantages of a gas-insulated RMU over air-insulated units?
   It offers compact size, higher reliability, minimal maintenance, and better resistance to harsh environments (dust, moisture, pollution).

4. Does the 24kV SF6 RMU comply with international standards?
   Yes, it typically meets IEC 62271, IEEE C37.60, and other relevant standards for performance and safety.

5. What protection features are included in the RMU?
   Standard protections include overcurrent, short-circuit, earth fault, and SF6 gas pressure monitoring with low-pressure alarms.

6. How is the SF6 gas leakage monitored?
   The unit is equipped with a gas density monitor or pressure gauge to detect and alert for any gas leakage.

7. What is the expected lifespan of a 24kV SF6 RMU?
   With proper maintenance, the lifespan is typically 25-30 years under normal operating conditions.

8. Can the RMU be integrated with smart grid systems?
   Yes, it can be fitted with remote monitoring, SCADA communication, and automation capabilities for smart grid applications.

9. What maintenance is required for an SF6-insulated RMU?
   Routine checks include gas pressure verification, contact resistance measurement, and mechanical operation tests. SF6 gas handling requires certified personnel.

10. Is the RMU suitable for indoor and outdoor installation?
    Yes, it is designed for both indoor and outdoor use, with corrosion-resistant enclosures (typically stainless steel or powder-coated) for outdoor installations.