10kv Gas Insulated Ring Main Unit (SF6)

10kv Gas Insulated Ring Main Unit (SF6) Introduction

- Fill the gas box with SF6 vapor and undergo synchronous vacuum packaging for leak detection; The high-voltage load switch, grounding device power switch, circuit breaker insulation layer cylinder and other power switch themed movable components, as well as the bus duct, are sealed in a stainless steel plate air box. The waterproof level of the air hood is P67, and the dust collector is equipped with a glass diaphragm. When the internal pressure of the power switch exceeds a certain working pressure, it can be discharged from the explosion-proof port below, which can reasonably avoid harm to people, cables, and other switchgear in the distribution station.

1. What is a 10kV Gas Insulated Ring Main Unit (RMU)?
   It is a compact, sealed switchgear unit using SF6 gas for insulation and arc quenching, designed for secondary distribution networks in 10kV systems.

2. What are the key advantages of SF6-insulated RMUs?
   High reliability, minimal maintenance, compact size, and superior performance in harsh environments (dust, moisture, corrosion).

3. How does SF6 gas enhance the RMU’s performance?
   SF6 provides excellent dielectric strength and arc-extinguishing properties, ensuring safe operation and reduced electrical clearances.

4. What load-breaking capabilities does a 10kV SF6 RMU offer?
   Typical ratings include 630A normal current, 20kA short-circuit current, and cable/transformer switching duties.

5. Is the RMU designed for indoor or outdoor installation?
   Both options are available, with outdoor units housed in weatherproof enclosures (e.g., IP67 rated).

6. What safety features are incorporated?
   Gas density monitoring, pressure relief devices, mechanical interlocks, and fault indicators to prevent unsafe operations.

7. How is SF6 gas leakage monitored?
   Integrated gas pressure sensors or gauges trigger alarms if pressure falls below safe thresholds.

8. What maintenance is required for SF6 RMUs?
   Minimal maintenance—periodic gas pressure checks, mechanical operation tests, and visual inspections (no regular gas replenishment needed).

9. Can the RMU be automated for smart grid applications?
   Yes, options include remote monitoring, motorized operation, and integration with SCADA systems.

10. What environmental regulations apply to SF6 RMUs?
    SF6 is a greenhouse gas; modern units use sealed-for-life designs or SF6-free alternatives (e.g., clean air/N2 mixtures) to comply with emissions standards.