With the continuous development of industrial power systems, power plants and electrical facilities require safer and more reliable solutions for power isolation during equipment maintenance. High-voltage disconnecting switches play an essential role in ensuring electrical safety by providing reliable isolation and improving maintenance efficiency.
The GN22-6 Series Indoor High-Voltage Disconnecting Switch is a new-generation high-voltage electrical device developed for medium-voltage power systems. By integrating advanced mechanical transmission technology, optimized contact structures, and high-strength conductive components, the GN22-6 series provides reliable isolation performance for large power plants and industrial electrical applications.
The GN22-6 indoor high-voltage disconnecting switch is mainly used in large power plants and electrical systems to isolate power supplies during equipment inspection and maintenance. The product can be configured as three independent single-pole units or an integrated three-pole assembly, providing flexible installation options for different power system requirements.
The disconnecting switch and its matching operating mechanism comply with GB 1985 (Alternating Current High-Voltage Disconnecting Switches and Earthing Switches), ensuring reliable performance and compatibility with high-voltage electrical equipment standards.
| Item | Technical Requirement |
|---|---|
| Altitude | ≤1000 m |
| Ambient Temperature | -25℃ ~ +40℃ |
| Relative Humidity | ≤90% (at +25℃) |
| Installation Environment | No severe corrosive gas, salt mist, dust, explosive or erosive substances |
| Vibration Condition | No frequent severe vibration |
The GN22-6 series adopts a three-pole knife-blade structure. The conductive components of each pole are fixed on the base frame through post insulators or bushing insulators, ensuring stable mechanical support and electrical insulation performance.
The switch blades are manufactured from thickened copper plates with precision machining technology, improving the surface quality and electrical conductivity of conductive components. The optimized contact structure provides reliable connection performance and offers self-cleaning capability during operation, helping reduce contact resistance and improve service stability.
Different from traditional disconnecting switch mechanisms, the GN22-6 series adopts a specially designed two-step closing and locking mechanism to solve the common challenge between high contact pressure and operating torque.
During the first 80° rotation of the main shaft, the switch blade moves from the fully open position to the preliminary closed position.
During the following 10° rotation, the locking block mechanism drives the central locking rod, steel balls, and ejector pins. The magnetic lock plates amplify the force through a lever structure, increasing the thrust approximately 5.5 times and generating strong contact pressure on the switch blade.
This innovative structure provides:
The GN22-6 series supports various rated current requirements, making it suitable for high-current power distribution and maintenance isolation applications.
| Model | Rated Voltage (kV) | Maximum Operating Voltage (kV) | 1-Minute Power Frequency Withstand Voltage (kV) | Rated Current (A) | Dynamic Stability Current (kA) | 3s Thermal Stability Current (kA) |
|---|---|---|---|---|---|---|
| GN22-6/3150-50 | 6 | 7.2 | 42 | 3150 | 125 | 50 |
| GN22-6/4000-40 | 6 | 7.2 | 42 | 4000 | 100 | 40 |
| GN22-6/5000-63 | 6 | 7.2 | 42 | 5000 | 160 | 63 |
| GN22-6/6300-100 | 6 | 7.2 | 42 | 6300 | 250 | 100 |
| GN22-6/8000-100 | 6 | 7.2 | 42 | 8000 | 250 | 100 |
Notes: GN22-10 represents flat-mounted type; C represents through-wall type; D represents earthing type.
The GN22-6 disconnecting switch supports horizontal, vertical, and inclined installation methods, allowing flexible integration into different electrical systems.
Compatible operating mechanisms include:
| Rated Current | Maximum Operating Torque |
|---|---|
| 2000A | <145 N·m |
| 3150A | <180 N·m |
| 4000A | <200 N·m |
| 5000A | <250 N·m |
| 6300A | <300 N·m |
| 8000A | <350 N·m |
To maintain stable performance, regular inspection and maintenance should be carried out after commissioning. Recommended maintenance procedures include:
| Component | Recommended Material |
|---|---|
| Moving Components | ZG-1 Lubricating Grease |
| Contact Surface Protection | SYB1607 Industrial Petrolatum |
As electrical systems continue to develop toward higher capacity and improved reliability, advanced disconnecting switch technology has become increasingly important for power safety and equipment maintenance.
With high-current capability, optimized contact structures, and reliable mechanical design, the GN22-6 Indoor High-Voltage Disconnecting Switch provides a dependable isolation solution for power plants, substations, and industrial electrical systems.
By improving operational safety and equipment reliability, the GN22-6 series supports the modernization and stable development of medium-voltage power infrastructure.
