KENJING SF6 Gas-Insulated Switchgear (RMU) — Modular, Sealed Medium-Voltage Distribution

Description

KENJING’s KJSF6-12 SF6 gas-insulated switchgear is a modular ring main unit platform for medium-voltage distribution. A sealed gas tank (IP67) integrates the vacuum circuit breaker, three-position isolator/earthing switch, CT/PT, surge arresters, and plug-in bushings. Single-tank or common-tank lineups adapt to incoming, feeder, and PT units with side or top extensions, enabling compact two-in/two-out and two-in/four-out schemes for urban networks, industrial plants, and renewables.

Key Features and Advantages

• Sealed, compact architecture
  Gas-insulated compartment with robotic welds; enclosure protection up to IP4X and gas tank IP67. Typical tank pressure 0.04–0.05 MPa; annual leakage rate < 0.01%. Cabinet width can be as low as ~325 mm for high feeder density.

• Flexible modules
  PT cabinet, V-cabinet (VCB + isolator), and common-tank VVV options. Standard 630 A busbar/feeder rating, with short-time withstand 20 kA/4 s or 25 kA/4 s and peak 50/63 kA. Supports loop switching, transformer and cable-charging duties.

• High insulation strength
  Power-frequency withstand and lightning impulse levels meet international RMU practice (e.g., 12/18/24 kV classes with typical 42/48–50/65 kV PF and 75/85–125/145 kV LI values across phase-to-phase, phase-to-earth, and open-gap).

• Safety interlocking
  Five-interlock logic between the breaker, isolator/earthing switch and doors prevents mis-operation. Pressure gauge and inspection window enable safe condition checks.

• Fast fault clearing
  Vacuum circuit breaker with spring operating mechanism delivers high making/breaking capability and long mechanical life (up to 10,000 operations). Optional F-unit combines load switch + fuse for transformer protection.

• Digital-ready
  Optional DTU integrates measurement, control and protection; supports feeder automation and remote SCADA.

• Standards compliance
  Designed around IEC 56/62271-100 (circuit-breakers), IEC 129/62271-102 (isolating & earthing switches), IEC 298/62271-200 (metal-enclosed switchgear), IEC 60529 (IP), and related CT/PT standards.

Typical Applications

Urban distribution RMUs, industrial substations, renewable collection points, compact secondary substations, and network automation retrofits.

Ordering Information (what to specify)

1. Rated voltage, rated current, and short-circuit breaking / withstand levels.

2. Function per panel: load switch or circuit breaker (VCB).

3. Isolator arrangement: upper- or lower-isolation type.

4. Mechanism supply (AC/DC 220/110/48/24 V), secondary wiring, and special interlocks.

5. Busbars, incoming/outgoing plug-in bushings, and side/top extensions.

Why Choose KENJING

• Proven sealed-tank engineering for long service intervals and environmental robustness.

• Configurable RMU platform that scales from single-tank PT and feeder panels to common-tank multi-feeder solutions.

• Production quality with robotic welding, tight leak-rate control, and full routine tests to IEC.

• Lifecycle support — engineering assistance, spares, and retrofit guidance for network upgrades.

Upgrade your MV distribution with a compact, safe SF6 gas-insulated switchgear lineup. Send your single-line and required ratings to KENJING for a fast configuration and quote.