XGN66-12 Fixed Closed Switchgear
XGN66-12 fixed enclosed switchgear is a new-generation high-voltage electrical equipment complete set product developed by GOHO. It complies with national standard GB 3906 “-35kV AC Metal-Enclosed Switchgear” and the Electrical Department’s DL/T 404 “Technical Conditions for Ordering Indoor AC High Voltage Switchgear,” as well as international standard IEC 62271-200 “High-Voltage Switchgear and Controlgear — Part 200: AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to and Including 52kV.”
The switchgear adopts a fixed-mounting configuration with a compact box-type enclosure, integrating vacuum circuit breakers, disconnecting switches, earthing switches, current and voltage transformers, and protective control devices into a single metal-enclosed frame. Its small footprint and straightforward construction make it particularly suitable for space-constrained substations and secondary distribution applications where withdrawable functionality is not required.
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) | 20kA / 25kA / 31.5kA (4s) |
| Rated Peak Withstand Current (Ipk) | 50kA / 63kA / 80kA |
| Degree of Protection | IP3X / IP4X (enclosure) |
| Installation Type | Fixed mounting, indoor |
| Circuit Breaker Type | Vacuum circuit breaker (ZN series) |
| Operating Mechanism | Spring-operated mechanism (manual or motor-charged) |
| Mechanical Endurance | ≥ 10,000 operations |
| Panel Width | 800mm / 1000mm (standard schemes) |
| Standards | GB 3906, DL/T 404, IEC 62271-200 |
Key Features
- New-Generation Design: Developed in accordance with the latest GB 3906 and DL/T 404 standards, incorporating modern manufacturing techniques and materials for improved performance and reliability over earlier generation equipment
- Compact Box-Type Enclosure: Smaller footprint and lower height compared to conventional fixed-type switchgear — ideal for space-constrained urban substations, indoor distribution rooms, and prefabricated substation integration
- Fixed-Mounting Construction: All main components are permanently installed with no withdrawable carriages, providing a simple, robust, and cost-effective solution for applications where frequent unit replacement is not required
- Vacuum Circuit Breaker: Equipped with ZN series vacuum circuit breakers featuring sealed vacuum interrupters with low maintenance requirements, long electrical life, and environmentally friendly operation — no SF6 gas or oil used
- Reliable Mechanical Interlocking: Interlocks between the circuit breaker, disconnecting switch, earthing switch, and panel door ensure correct operating sequences and prevent unsafe operations in compliance with IEC 62271-200 safety requirements
- Comprehensive Protection: Supports overcurrent, short-circuit, earth fault, undervoltage, and overvoltage protection schemes through integrated microprocessor-based protection relays
- Easy Installation and Maintenance: Simple panel-to-panel busbar connections and front-access cable termination simplify installation and reduce commissioning time
Applications
- Urban and rural power distribution substations
- Industrial and mining enterprise power receiving and distribution
- Commercial building medium voltage switchboards
- Infrastructure — schools, hospitals, public facilities
- Secondary distribution networks
- Renovation and expansion of existing substations
- Prefabricated substation integration