KENJING GKJ C-GIS Gas-Insulated Metal-Enclosed Switchgear — Compact, Arc-safe MV Distribution up to 40.5 kV

Description

The GKJ C-GIS series is a compact, metal-enclosed medium-voltage switchgear that uses SF₆ (or dry air/N₂ on request) as the primary insulating medium inside a stainless-steel, hermetically sealed tank. It is engineered for three-phase AC distribution and section-alizing systems in transmission and substations, industrial/mining facilities, rail transit, renewable plants, and dense urban networks—especially where humidity, dust, altitude, or pollution demand IP-rated, corrosion-resistant equipment.

A horizontally arranged VKJY vacuum circuit breaker (VCB) is integrated as the main switching device. A mechanically linked three-position switch (Close–Open–Earth) provides make/isolate/earthing in one unit, simplifying primary layouts and improving interlocking safety. The intelligent control module monitors breaker status, three-position switch position, gas pressure, and spring energy storage; it also acquires voltage/current/energy/frequency, logs faults, and supports conventional secondary control for streamlined on-site commissioning.

Model Meaning

GKJ – □ / □ – □

• Rated short-circuit breaking current (kA)
• Rated current (A)
• Rated voltage (kV)
• Company gas-insulated switchgear model code

Conditions of Use

• Ambient temperature: −25 °C…+40 °C
• Altitude: ≤ 1000 m (consult for > 4000 m)
• Humidity: daily avg ≤ 95 %; monthly avg ≤ 90 % (water-vapor pressure daily ≤ 2.2 kPa; monthly ≤ 1.8 kPa)
• Environment: clean, non-flammable, minimal dust/smoke/salt spray; free of severe vibration; EMC induced voltage in secondary ≤ 1.6 kV; seismic intensity ≤ 8°

Reference Standards

GB/T 3906, GB/T 11022, DL/T 593, GB/T 404; GB/T 1984 (AC circuit-breakers); GB/T 3804 (AC load-break switches & earthing); plus related IEC-aligned specifications for GIS assemblies.

Product Features

• Integrated breaker & three-position switch: One sealed tank delivers Close–Open–Earth with direct mechanical interlock for dependable “Five-Protection” compliance.
• High dielectric & arc safety: Vacuum interruption with SF₆ (or dry gas) insulation; internal arc design tested up to 40 kA/1 s.
• Smart monitoring: Gas density/pressure indication, energy-storage status, position sensing, measurement & fault recording for quick diagnostics.
• Corrosion-resistant build: Stainless enclosure, nickel/zinc-plated mechanisms; high salt-spray endurance.
• Low-leakage, high IP: ≤ 0.01 %/y leakage; IP68 tank prevents moisture ingress for tropical/condensing sites.
• Fast installation: Pre-assembled modules on a common aluminum plate; minimal field adjustment; simplified secondary wiring.
• Efficient conductors: T2 silver-plated copper main circuits meet 1.1× rated temperature-rise requirements.

Switches & Mechanisms (Core Components)

VKJX-12…40.5 Vacuum Circuit Breaker

• Rated voltage: 12/24/40.5 kV; rated current: 630…3150 A
• Short-circuit breaking: 25/31.5/40 kA (12 kV) or 20/25/31.5 kA (24/40.5 kV)
• Short-time withstand: 25/31.5/40 kA for 4 s; Making (peak): 63/80/100 or 50/63/80 kA
• Control: Closing/opening coils DC 220 V (typ.), 1.3 A; energy-storage motor 120 W, DC 220 V
• Timing: Opening 20 ≤ t ≤ 50 ms; Closing 30 ≤ t ≤ 70 ms; contact bounce ≤ 2 ms; PD ≤ 10 pC
• Mechanical life: E2 duty; numerous rated fault operations

SKJY-12…40.5 Three-Position Disconnector/Earthing Switch

• Power-frequency withstand (1 min): 42/65/95 kV (phase-to-phase/earth), 48/79/118 kV (across gap)
• Lightning impulse: 75/125/185 kV (phase-to-phase/earth), 85/145/215 kV (across gap)
• Manual operating torque: 200 N·m; mechanical life: 3000 ops
• Motorized drive: 200 W, DC 220 V/110 V; operating range 85%–110%

Typical Schemes

Cable incoming/outgoing; Incoming with PT; Overhead line incoming; Sectionalizer with circuit breaker; Sectionalizing isolator; Stand-alone PT unit. Single- or double-gas-compartment layouts are available to match feeder counts and footprint.

Ordering Information

When requesting GKJ C-GIS, please specify:

• Rated voltage, rated current, and short-circuit breaking current;
• Scheme type (e.g., incoming feeder, outgoing feeder, PT, sectionalizer), single-line diagram, arrangement, and quantity;
• Secondary wiring diagram/terminal plan (or use factory standard);
• Auxiliary/control power supply and optional accessories;
• Gas type (SF₆ / dry air / N₂), altitude/special environment if applicable;
• Required spare parts and any non-standard features.

Why GKJ C-GIS
Compact, internally arc-safe construction; robust mechanical interlocks; intelligent diagnostics; and wide ratings up to 40.5 kV/3150 A make GKJ C-GIS an excellent choice for modern MV networks where reliability, safety, and rapid deployment matter.