XGN2-12(Z) Fixed Type AC Metal-Enclosed Switchgear
XGN2-12(Z) box-type fixed AC metal-enclosed switchgear is a fixed-mounting medium voltage switchgear designed for three-phase AC single bus, double bus, and single bus with bypass systems, with rated voltage of 3.6–12kV, rated frequency of 50Hz, and rated current of 630A–3150A. It is used for receiving and distributing electrical energy in power systems.
The switchgear adopts a fixed-mounting configuration with all main components — including the vacuum circuit breaker, disconnecting switch, current transformers, voltage transformers, and protective relays — permanently installed within a metal-enclosed earthed steel frame. Unlike withdrawable alternatives, the fixed design offers a simpler, more robust construction with fewer mechanical interlocking components, resulting in higher long-term reliability and lower maintenance requirements. It can meet the use requirements of various types of power plants, substations, and industrial and mining enterprises.
The cabinet body is constructed from high-strength steel plates with electrostatic spray-powder coating, providing excellent corrosion resistance and mechanical protection. The panel door is equipped with mechanical interlocks linked to the disconnector and circuit breaker, ensuring safe operating sequences in compliance with IEC 62271-200.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | 3.6kV / 7.2kV / 12kV |
| Rated Insulation Voltage | 12kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current (Main Busbar) | 630A – 3150A |
| Rated Short-time Withstand Current (Icw) | 25kA / 31.5kA / 40kA (4s) |
| Rated Peak Withstand Current (Ipk) | 63kA / 80kA / 100kA |
| Busbar System | Single bus / Double bus / Single bus with bypass |
| Degree of Protection | IP3X / IP4X (enclosure) |
| Installation Type | Fixed mounting |
| Circuit Breaker Type | Vacuum circuit breaker (ZN series) |
| Operating Mechanism | Spring-operated mechanism (manual or motor-charged) |
| Mechanical Endurance | ≥ 10,000 operations |
| Panel Dimensions (W×D×H) | 1100 × 1200 × 2800 mm (standard scheme) |
| Standards | IEC 62271-200, GB 3906 |
Key Features
- Flexible Busbar Configuration: Supports single bus, double bus, and single bus with bypass systems, providing versatile solutions for different substation topologies and operational requirements
- Fixed-Mounting Design: All components are fixed in place with no moving carriages or draw-out mechanisms — fewer moving parts means higher reliability and lower maintenance costs over the equipment lifecycle
- Cost-Effective Solution: Lower initial capital expenditure compared to withdrawable switchgear, with reduced lifetime maintenance costs, making it the preferred choice for standard distribution projects where frequent unit replacement is not required
- Reliable Mechanical Interlocking: Panel door interlocked with disconnector and circuit breaker operating mechanisms, preventing incorrect operations and ensuring safe maintenance access — door cannot be opened while the circuit breaker is in the closed position
- Arc-Resistant Capability: Designed with pressure-relief channels and arc containment features to mitigate internal arc fault effects in accordance with IEC 62271-200
- Clear Compartmentalization: Logical functional separation between busbar, circuit breaker, and cable compartments within the enclosed frame, facilitating safe inspection and routine maintenance
- Proven Field Performance: One of the most widely deployed fixed-type medium voltage switchgear models in China, with decades of reliable operation across thousands of substation installations
Applications
- Urban and rural power distribution substations
- Thermal and hydro power plants — auxiliary power distribution
- Industrial and mining enterprises — process power supply
- Commercial and public building medium voltage distribution
- Infrastructure — railways, airports, hospitals
- Oil and gas field power supply systems