Secondary Switchgear Cabinet
LQKN28G-1 Secondary Switchgear Cabinet: Reliable 3kV Protection for Critical Infrastructure
Structural Design
Constructed with hot-dip galvanized steel (KN28G-1 standard cabinet), this IP20-rated indoor switchgear integrates:
Vacuum circuit breakers with spring-operated mechanisms
Epoxy-cast voltage/current transformers
Closing surge suppression devices
Isolation switchgear with remote operation capability
Core Technical Specifications
| Parameter | Value |
|---|---|
| Rated Frequency | 50Hz (Single Phase) |
| Dimensions (H×W×D) | 2800×1200×1000 mm |
| Dry Weight | <1350 kg |
| Main Circuit Resistance | <60 μΩ |
| Environmental Rating | Indoor Use, IP20 |
Component Specifications
Vacuum Circuit Breaker
Rated Voltage: 3kV
Rated Current: 100A
Breaking Capacity: 16kA
Operating Mechanism: Spring
Voltage Transformer
Type: Epoxy-cast / Full Insulation
Rated Voltage: 3kV
Ratio: 3kV/100V
Accuracy Class: 0.5
Current Transformer
Type: Epoxy-cast
Rated Voltage: 3kV
Ratio: 100A/5A
Accuracy Class: 0.5
Isolation Switchgear
Rated Voltage: 3kV
Max Withstand Voltage: 6kV
Thermal Stability (4s): 12.5kA
Dynamic Stability (Peak): 31.5kA
Protection & Control Features
Auto-Trip Function: Breaker opens during control circuit voltage loss
Overvoltage Protection: Integrated surge suppression
Overcurrent Protection: Coordinated with instrument transformers
Remote Operation: Enabled through SCADA-compatible interfaces
Industrial Applications
Manufacturing Plants: Primary distribution subpanels
Renewable Energy: Wind turbine step-down protection
Railway Electrification: Traction power substations
Data Centers: Medium-voltage UPS input protection
Safety Compliance
Designed to meet IEC 62271-200 standards for metal-enclosed switchgear. Galvanized construction prevents corrosion in industrial environments.
