ZCW10-40.5L(G) Outdoor Open-Type SF6 Gas-Insulated Switchgear (GIS)
The ZCW10-40.5L(G) Outdoor Open-Type SF6 Gas-Insulated Switchgear (GIS) is a compact and reliable high-voltage switching solution designed for 40.5kV three-phase AC power systems. Integrating the SF6 circuit breaker, disconnect switch, earthing switch, and optional current transformers into a factory-assembled outdoor unit, it provides efficient installation, reliable switching performance, and reduced substation footprint. It is widely used in urban substations, industrial power systems, renewable energy projects, and space-limited power facilities.
Get a QuoteOverview
The ZCW10-40.5L(G) Outdoor Open-Type SF6 Gas-Insulated Switchgear (GIS) is an integrated high-voltage switchgear solution developed for 40.5kV, 50Hz three-phase AC power systems. Using air as the external insulation medium and SF6 (Sulfur Hexafluoride) gas for arc extinguishing and internal insulation, it delivers reliable switching performance, compact installation, and stable operation for modern power networks.
The complete switchgear assembly combines an SF6 circuit breaker, disconnect switch, earthing switch, optional built-in current transformers (CTs), steel support structure, and control cabinet into a factory-assembled unit. This integrated design helps reduce installation complexity, shorten project schedules, and minimize substation space requirements.
The ZCW10-40.5L(G) Outdoor SF6 GIS is widely applied in urban substations, industrial power distribution systems, renewable energy projects, and compact power facilities where reliable operation and space optimization are essential.
Model and meaning
Features
Integrated Compact GIS Structure
The ZCW10-40.5L(G) Outdoor Open-Type SF6 Gas-Insulated Switchgear integrates multiple primary high-voltage components into a compact outdoor assembly, including:
- SF6 Circuit Breaker
- Disconnect Switch
- Earthing Switch
- Built-in Current Transformers (Optional)
- Steel Support Structure
- Secondary Control Cabinet
The factory-assembled modular design reduces on-site installation requirements. After delivery, only foundation mounting and electrical connections are required before commissioning, helping shorten project construction time.
High-Performance SF6 Circuit Breaker
The switchgear is equipped with a compact dead tank SF₆ circuit breaker featuring the CT35 spring operating mechanism, providing reliable switching performance and long-term mechanical stability.
Key features include:
- Factory-adjusted operating mechanism
- Stable opening and closing operation
- Mechanical endurance of more than 10,000 operations
- Suitable for frequent switching applications
Advanced Self-Blast Arc Extinguishing Technology
The circuit breaker adopts a self-blast compressed-gas arc-extinguishing chamber, delivering excellent interruption capability and reliable fault current breaking performance.
Main advantages include:
- Rated short-circuit breaking current up to 40kA
- Capability of up to 12 full short-circuit interruptions at 40kA
- No restrike during unloaded transmission line switching up to 50 km
- Excellent performance for cable switching and capacitor bank applications
The optimized interrupter design ensures stable operation under demanding power system conditions.
Reliable SF6 Gas Sealing System
The gas tank adopts advanced sealing technology to maintain long-term SF6 insulation reliability and stable switching performance.
Key features include:
- High-quality imported sealing gaskets
- V-type spring compensation sealing structure
- Annual SF6 leakage rate ≤ 0.5%
- Integrated SF6 gas density monitoring system
- Total SF6 gas filling quantity of approximately 8 kg
The reliable sealing structure helps maintain consistent insulation and arc-extinguishing performance throughout the equipment service life.
Integrated Current Transformer Solution
The optional built-in current transformer (CT) design eliminates the need for external CT installation, simplifying system layout and reducing overall installation requirements.
Main advantages include:
- Up to 12 integrated CT units
- Nanocrystalline alloy magnetic core technology
- Metering accuracy up to Class 0.2 / 0.2S
- Reduced substation footprint
- Simplified primary wiring
- Lower project investment cost
Three-Position Mechanical Interlocking System
The integrated disconnect switch and earthing switch provide three clearly defined operating positions:
- Closed position
- Open position
- Grounding position
The mechanical interlocking mechanism prevents incorrect operating sequences, improving operational safety and protecting maintenance personnel during equipment servicing.
Technical Data
Electrical Ratings
| Item | Unit | Parameter |
| Rated Voltage | kV | 40.5 |
| Rated Current | A | 2000 / 3150 |
| Rated Frequence | Hz | 50 |
| Lightning Impulse Withstand Voltage | kV | 185 |
| Power Frequency Withstand Voltage (1 min) | 95 | |
| Rated Short-Circuit Breaking Current | kA | 40 |
| Rated Peak Withstand Current | 100 | |
| Rated 4s Short-Time Withstand Current | 40 | |
| Capacitor Bank Switching Current | A | 400 |
| Rated operating sequence | / | C–0.3s–CO–180s–CO |
| Out-of-Phase Breaking Current | kA | 10 |
| Mechanical Life | Times | ≥10000 |
| SF6 Rated Filling Pressure (20°C) | MPa | 0.5 |
| Alarm / Lockout Pressure | 0.45 | |
| Annual SF6 Leakage Rate | % | 5 |
| SF6 Moisture Content | V/V | ≤150 × 10⁻⁶ |
| Total Weight | kg | Approx. 1400 |
Mechanical Performance
| Item | Specification |
| Total Contact Travel | 95 ±2 mm |
| Contact Separation | 60 ±1.5 mm |
| Pole Opening Synchronization | ≤2 ms |
| Phase Opening Synchronization | ≤3 ms |
| Main Circuit Resistance | ≤120 μΩ |
| Closing Speed | 3.2 ±0.2 m/s |
| Opening Speed | 3.4 ±0.2 m/s |
| Closing Time | ≤0.15 s |
| Opening Time | ≤0.06 s |
Operating Mechanism
| Item | Specification |
| Trip/Close Coil Voltage | DC110V / DC220V |
| Energy Storage Motor Voltage | AC/DC110V, AC/DC220V |
| Motor Operating Voltage Range | 85%–110% Rated Voltage |
| Energy Storage Time | <15 s |
| Motor Rated Current | 5 A |
Overall and mounting dimensions(mm)
Installation Features
The ZCW10-40.5L(G) Outdoor Open-Type SF6 GIS is designed with a compact structure and optimized installation layout, enabling efficient field installation and commissioning.
Key installation features include:
- Three-phase integrated structure
- Pole spacing of 700 mm
- Overall equipment height of 3620 mm
- Base dimensions of 1000 × 1000 mm
- Four Φ18 mounting holes
- Factory-aligned operating mechanism
- Simplified on-site commissioning process
The pre-assembled design reduces installation workload and helps improve overall project execution efficiency.
Typical Applications
The ZCW10-40.5L(G) Outdoor SF6 Gas-Insulated Switchgear is widely applied in various medium-voltage substation and power distribution projects, including:
- 35kV and 40.5kV substations
- Urban power distribution substations
- Industrial and mining power systems
- Renewable energy substations
- Wind power and solar power generation projects
- Utility transmission and distribution networks
- Space-limited substations
- Substation expansion and modernization projects
With its compact design and reliable SF6 switching technology, the ZCW10-40.5L(G) provides an effective solution for modern power grid applications requiring high reliability and reduced installation space.
Why Choose the ZCW10-40.5L(G) SF6 GIS?
The ZCW10-40.5L(G) Outdoor Open-Type SF₆ Gas-Insulated Switchgear provides reliable performance and flexible configuration for 35kV and 40.5kV power systems.
Main advantages include:
- Integrated outdoor 40.5kV SF6 Gas-Insulated Switchgear solution
- Factory-assembled compact structure for simplified installation
- Advanced self-blast SF6 arc-extinguishing technology
- High sealing reliability with annual SF6 leakage rate ≤0.5%
- Optional built-in CT design for reduced installation space
- Three-position disconnect and earthing switch interlocking system
- Mechanical endurance exceeding 10,000 operations
- Suitable for capacitor bank switching and long-distance transmission line applications
- Fast installation and reduced maintenance requirements
Customization Services
We provide comprehensive customization solutions to meet different utility, EPC, and industrial project requirements, including:
- Rated current configurations up to 3150A
- Built-in or external current transformer options
- Customized CT ratio, accuracy class, and burden requirements
- Auxiliary control voltage configurations
- Enhanced corrosion protection options for coastal environments
- OEM branding and project-specific configurations
- Technical drawings, factory testing, and commissioning support
Contact us for quotations, technical documentation, and customized 35kV and 40.5kV substation solutions.
