General
Application
Environmental
Standards
Cubicle-type Gas Insulated Switchgear is a metal-enclosed medium-voltage assembly where primary circuits are insulated in sealed gas compartments to maintain stable dielectric strength. A compartmentalized layout integrates busbar, circuit breaker, and cable functions with interlocked earthing and access control. Shielded conductors and controlled clearances reduce sensitivity to humidity, dust, and pollution. Modular panels support consistent layouts, straightforward extensions, and dependable switching performance with verifiable factory testing and clear maintenance boundaries.
Cubicle-type Gas Insulated Switchgear is applied where space is limited and dependable medium-voltage switching is required, including urban substations, commercial and industrial plants, data centers, and renewable integration nodes. Sealed insulation supports operation in coastal, dusty, and high-humidity sites, reducing contamination-related outages. Typical duties include feeder protection, transformer incomer and outgoing control, sectionalizing, and bus-tie schemes. Integrated earthing and interlocking support safe maintenance procedures and consistent operational discipline.
Application:indoor installation.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available fo·r project-specific requirements.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available fo·r project-specific requirements.
IEC 62271-200 — AC metal-enclosed switchgear and controlgear (1 kV–52 kV)
IEC 62271-1 — Common specifications (above 1 kV)
IEC 62271-100 — AC circuit-breakers
IEC 62271-102 — Disconnectors and earthing switches
IEC 62271-103 — AC switches and switch-disconnectors (1 kV–52 kV)
IEC 62271-4 — Handling procedures for SF6 and its mixtures
IEC 62271-1 — Common specifications (above 1 kV)
IEC 62271-100 — AC circuit-breakers
IEC 62271-102 — Disconnectors and earthing switches
IEC 62271-103 — AC switches and switch-disconnectors (1 kV–52 kV)
IEC 62271-4 — Handling procedures for SF6 and its mixtures
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Why Choose Kerun Intelec
Choose us for precision-engineered transformers—superior efficiency, global certifications, 24/7 support, and tailored solutions. Trusted durability, energy-saving innovation, ensuring optimal performance and longevity worldwide.
Fast Lead Times
Our made-to-order production timelines are highly competitive and as low as 8 weeks from order to delivery.
Design Conformance
We maintain rigorous oversight to ensure every transformer adheres precisely to your exact specifications.
Comprehensive Warranty
We stand behind the longevity and reliability of our products with a robust warranty that covers both materials and workmanship.
Competitive Pricing
We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag
Exceptional Quality
We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.
Dedicated Support
Our support team is always at your service.Offering expert guidance from initial inquiry through post-installation support.
Switchgear (C-GIS) Features
Cubicle-type Gas Insulated Switchgear delivers compact, sealed insulation stability, enabling high functional density, improved operational safety, and predictable maintenance performance for demanding indoor switchrooms.
Flexible Design - Well-matched To A Range Of Applications.
Modular incomer, feeder, bus-coupler, ATS, and capacitor sections adapt to varying ratings, protection schemes, and compartment forms for project-specific single-line requirements.
Space Saving – Effective, Flexible Layout
Sealed gas insulation enables reduced phase-to-phase and phase-to-earth clearances, delivering a compact panel footprint and easier lineup planning for indoor rooms with tight aisle, cable, or wall constraints.
Laborsaving – Reduction of Manpower
Front-access construction, clear interlocks, and pre-engineered wiring/terminal arrangements shorten installation and commissioning steps, reducing dependency on specialized labor for routine switching checks and functional verification.
Energy Saving – Reduced Operating Costs
Optimized main-circuit contact design and low-resistance connections limit I²R losses and heat generation, helping reduce ventilation demand and improving efficiency across continuous-load operation in medium-voltage distribution boards.
High Reliability – Long-term, Trouble-free Operation
Primary parts operate within a sealed, contamination-resistant enclosure, limiting moisture, dust, and corrosion effects; stable dielectric conditions support consistent switching performance and predictable insulation margins over the service life.
Safe Design – Ensures Operator’s Safety
Compartmentalization, mechanical/electrical interlocking, and controlled access support safe operating sequences, while pressure relief paths manage internal overpressure events to reduce exposure risk during abnormal fault conditions.
Minimal Maintenance – Reduced Maintenance Costs
Sealed gas compartments keep primary insulation stable without periodic cleaning, so maintenance centers on mechanism checks, interlock verification, and condition indicators. Extended service intervals reduce outages, spare parts usage, and total maintenance cost.
Busbar Compartment (GIS Tank)
Sealed, segregated busbar GIS tank maintains constant insulation conditions, supports compact layouts, and limits fault propagation for higher availability overall.
Busbar Compartment (GIS Tank)
The busbar compartment uses a sealed, earthed GIS tank housing three-phase bus conductors, insulating supports, bushings, screened joints, and gas-pressure monitoring. It maintains stable dielectric clearances, limits contamination influence, and improves service continuity in compact MV layouts.
Main Components
Main busbars (Cu/Al)
Shielding & field grading parts
Busbar links / plug-in connectors
Sealing flanges & O-rings/gaskets
Insulating supports / barriers
Gas pressure gauge / sensor
Bushings / wall bushings
Pressure relief device
Circuit Breaker Compartment
Sealed interruption compartment delivers dependable fault clearing and switching accuracy, supporting coordinated protection and stable service continuity.
Circuit Breaker Compartment
The circuit breaker compartment integrates a vacuum interrupter assembly, stored-energy operating mechanism, close and trip coils, auxiliary contacts, and position indication. Coordinated with protection relays, it interrupts load and fault currents quickly, safely, reliably, consistently
Main Components
Vacuum circuit breaker (3 poles)
Auxiliary switch / auxiliary contacts
Spring/motor charging mechanism
ON/OFF position indicator
Closing / trip coils
Mechanical operations counter (optional)
Operating shaft & linkages
Disconnector / 3-Position Switch Compartment
Three-position switching provides clear isolating and earthing states with interlocked operation, improving safety and simplifying maintenance switching procedures.
Disconnector / 3-Position Switch Compartment
In Cubicle-type Gas Insulated Switchgear, the disconnector/three-position switch compartment combines ON–OFF–EARTH switching, a sealed operating shaft, mechanical interlocks, position indication, and voltage-detecting interface. It enables verified isolation and grounding without cross-positioning.
Main Components
Disconnector (DS) or 3-position switch
Key interlock (optional)
Mechanical interlocking mechanism
Voltage presence indicating system (VDS/VPIS)
Operating mechanism & manual operating interface
Phase comparison / test points (optional) Surge Arrester
Cable Compartment
Dedicated cable compartment provides clear access for terminations and testing, isolated from live sections, improving safety and outage planning overall.
Cable Compartment
The cable compartment in Cubicle-type Gas Insulated Switchgear provides the interface to MV cables via bushings and terminations, with stress-control elements, earthing bar, cable clamps, and test points. Its segregated layout supports safe installation, testing.
Main Components
Cable bushings / plug-in bushings
Cable clamps & bending supports
Cable terminations (elbow/plug-in or heat/cold shrink)
Earthing bar / earthing terminals
Stress cones / stress control components
Cable sheath test point (optional)
Earthing Switch Compartment
Dedicated earthing switch compartment provides visible, interlocked grounding for safe work zones, improving maintenance confidence and reducing switching risk.
Earthing Switch Compartment
In Cubicle-type Gas Insulated Switchgear, the earthing switch compartment incorporates a fault-making earthing switch, insulated contact system, earthing conductors, interlocked operating mechanism, and EARTH position indication. It provides verified grounding for cables and bus sections.
Main Components
Earthing switch (ES, optional fault-making class)
Earthing interlock mechanism
Earthing blades / contacts
EARTH position indicator
Earthing conductors/bars & bonding straps
LV Control & Protection Compartment
LV control and protection compartment centralizes monitoring and interlocking logic, improving operational accuracy, faster fault isolation, and safer switching coordination.
LV Control & Protection Compartment
The LV control and protection compartment houses protection IEDs, control relays, local/remote switches, indication and alarm devices, terminal blocks, auxiliary AC/DC supplies, communication gateways, and wireways. It enables dependable tripping, monitoring, and integration with SCADA.
Main Components
Protection relay (IED)
Auxiliary power (AC/DC) & MCBs
Control switches (Local/Remote, Close/Trip)
Communication modules/interfaces
Indication lamps & pushbuttons
Secondary wiring harness & cable ducts
Terminal blocks / terminals
Heater / lighting (optional)
Gas Insulated Switchgear Design Drawings
Design drawings clearly show the cubicle arrangement, gas-insulated compartments, busbar chamber, cable compartment, operating mechanism, and low-voltage control compartment for engineering review.
61kV_56000kVA_Power Transformer
230kV_80000kVA_Power Transformer
230kV_80000kVA_Power Transformer
Accessories Include
Vacuum Circuit Breaker, VCB
Three-position Disconnector Switch
Load Break Switch, LBS
Fuse Combination Unit
Fast Earthing Switch
SF₆ Gas Tank / Sealed Gas Compartment
Gas Density Relay
Gas Pressure Gauge
Gas Filling Valve / Refilling Port
Pressure Relief Device
Insulating Bushing
Main Busbar
Busbar Connector
Cable Bushing
Separable Cable Connector
Cable Clamp
Current Transformer, CT
Voltage Transformer, VT / PT
Zero-sequence Current Transformer
Voltage Presence Indicator
Numerical Protection Relay
Control and Monitoring Unit
Auxiliary Relay
Trip Coil / Closing Coil
Motor Operating Mechanism
Mechanical Interlock
Position Indicator
Heater and Temperature-Humidity Controller
About Testing
Each C-GIS cubicle-type gas insulated switchgear is tested to verify insulation performance, gas sealing reliability, mechanical operation, protection function, and safe switching operation before delivery.
Routine Tests
Type Tests
Special Tests
Visual inspection & nameplate check
Mechanical operation & interlock functional test
Dielectric withstand on main circuit (power-frequency)
Dielectric test on auxiliary/control circuits
Main circuit resistance measurement
Gas tightness / leakage verification
Temperature-rise test
Dielectric tests (power-frequency / impulse, as applicable)
Partial discharge test (as applicable for GIS)
Short-time withstand current & peak withstand current test
Internal arc classification test (IAC), if specified
Mechanical endurance (operating duty)
Helium leak / enhanced gas-tightness test (project-specific)
EMC/EMI tests (automation/SCADA environment)
Seismic qualification test
Climatic tests (low/high temperature, humidity/condensation)
Salt fog / corrosion test
SF₆ (or gas mixture) quality / moisture check (if specified)
All Switchgear undergo strict testing based on the latest IEEE and IEC standards, with detailed reports ensuring traceability. This guarantees each unit meets the highest standards of quality, safety, and performance.
Package & Delivery
Engineered packaging and controlled logistics protect transformers from damage, simplifying site handling, offloading, installation and commissioning project schedules.
Wooden / Steel Skid with Sealing Film
For nearby deliveries, we recommend skid plus sealing film when you need economical protection, forklift handling and quick onsite positioning.
Wooden / Steel Frame
We suggest wooden or steel framing when you require protection for protruding parts, highway transport, repeated loading and open-deck shipping.
Wooden Crate
Preferred for export and long routes; closed crates protect from weather, dirt and impact, allow stacking and minimise accessory loss.
Container Shipment
Ideal for high-value or overseas projects; containers improve weather protection, security and standardised lashing, simplifying sea–rail–road multimodal logistics.
Transportation & Delivery
We propose skid, frame, crate or container options based on route, handling and budget, ensuring safe, efficient transformer delivery.
Review key FAQ before purchasing C-GIS Cubicle-type Gas Insulated Switchgear, covering lead time, grid standard customization, material and accessory options, factory testing, installation support, and long-term reliable operation.
What Is The Lead Time For C-GIS Cubicle-type Gas Insulated Switchgear?
The typical lead time for C-GIS Cubicle-type Gas Insulated Switchgear is 4 to 8 weeks, depending on rated voltage, panel quantity, busbar current, short-circuit rating, protection configuration, control requirements, drawing approval, factory testing, and transportation schedule.
Can The Gas Insulated Switchgear Be Customized For Different Grid Standards?
Yes. C-GIS can be customized according to IEC, IEEE, GB, EN, and local utility standards. Electrical parameters, insulation level, protection logic, interlocking scheme, panel layout, cable entry direction, and documentation can be adapted to meet different grid and project requirements.
What Customization Options Are Available?
C-GIS supports customization of busbar materials, enclosure design, cable termination type, gas monitoring system, protection relays, CT/PT, earthing switch, circuit breaker, control components, mimic diagram, heater, indicators, and communication interface. Accessory brands can also be selected according to project requirements.
What Tests Will Be Performed Before Delivery?
Each C-GIS panel is tested before delivery, including visual inspection, mechanical operation test, interlock verification, power-frequency withstand test, insulation resistance test, contact resistance test, secondary wiring test, relay function test, gas leakage test, and final factory acceptance inspection.
Do You Support Installation?
es. Installation support can be provided through technical drawings, wiring diagrams, installation manuals, remote guidance, commissioning support, and on-site service when required. This helps ensure correct installation, safe energization, and stable long-term operation of the C-GIS system.
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Kerun Intelec
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