ROCKWILL 12kV MV Switchgear Solution: Reliable Power Control with Minimized Downtime
1. Solution Overview
Product: KYN28 Indoor Metal-Clad Withdrawable Switchgear
Voltage: 3.6kV, 7.2kV, 12kV, or 24kV (Select based on system voltage)
Application: Power plant distribution, substation receiving/transmission, industrial plant power distribution, large HV motor starting.
Key Advantage: Centralized draw-out design for partial de-energization during maintenance, minimizing downtime.
2. Core Technical Specifications
Parameter |
Value |
Rated Voltage (kV) |
3.6 / 7.2 / 12 / 24 |
Rated Frequency (Hz) |
50 / 60 |
Rated Current (A) |
630 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000 |
Rated Short-Circuit Breaking Current (kA) |
20 / 25 / 31.5 / 40 |
Rated Short-Time Withstand Current (4s) (kA) |
20 / 25 / 31.5 / 40 |
Power Frequency Withstand (1 min) |
Dry: 34-65kV (varies by voltage) |
Lightning Impulse Withstand (kV) |
75-125kV (varies by voltage) |
Protection Class (Housing) |
IP4X |
Ambient Temperature |
-15°C to +40°C |
Max. Installation Altitude |
1000m |
Mechanical Life (Circuit Breaker) |
VS1/VD4: 10,000 ops |
3. Key Design Features
Armored Compartmentalization: Four fully segregated metal compartments (Busbar, Breaker, Cable, Instrumentation) for enhanced safety (IEC 298 / GB 3906-91 compliant).
Centralized Draw-Out: Breaker (e.g., VD4, VS1, 3AH3) mounted on a withdrawable truck. Enables "hot" busbar maintenance without full system shutdown.
Modular & Flexible: Standard widths (800mm/1000mm) allow easy combination of functional units (incomer, feeder, metering, PT).
Special CT Design: Facilitates front-end wall-mounting and maintenance access.
High-Performance Components: Superior insulating materials & conductive elements ensure stability under fault conditions.
Compatibility: Supports major vacuum breakers (VS1, ABB VD4, Siemens 3AH3, GE VB2, ROCKWILL VSM).
4. Physical Layout & Dimensions
(Select based on Rated Current & Configuration)
Cabinet Width (A) |
Depth (B) (mm) |
Height (mm) |
Typical Weight (kg) |
Recommended Use Case |
650 mm |
1400 mm |
2200 mm |
700 |
<1250A, Compound Insulation, Front Cable Access |
800 mm |
1500 mm |
2200 mm |
800 |
<1250A, Air Insulation, Front Cable Access |
800 mm |
1600 mm |
2200 mm |
900 |
<1250A, Rear Overhead Line |
1000 mm |
1500 mm |
2200 mm |
1100 |
>1250A, Front Cable Access |
1000 mm |
1600 mm |
2200 mm |
1200 |
>1250A, Rear Overhead Line |
900 mm |
1700 mm |
2200 mm |
1000 |
Specific config (e.g., with Siemens 3AH5) |
Note: Height may reduce to 1660mm for 1000mm wide cabinets with rear overhead lines >1600A.
5. Component Selection
Circuit Breaker Options:
VS1/VD4/3AH3: Standard choice (10k ops).
VSM Magnetic Actuator: Ultra-long life (100k ops) for frequent switching.
Instrumentation: Special CTs for front access, VTs, surge arresters, relay protection devices (overload, short-circuit, earth fault).
Busbars: Main & branch busbars rated equal to circuit current.
Earthing: Integral earthing switch.
6. Implementation & Service
Specification: Define voltage, current, SC rating, breaker type, and layout (front/rear cable access).
Customization: ROCKWILL provides tailored solutions (design, assembly, testing).
Installation: Requires stable environment (<1000m, -15°C to +40°C, <95% humidity). No corrosive gases/vibration.
Commissioning: Functional & safety checks per IEC/GB standards.
Maintenance: Utilize draw-out feature for partial de-energization. Minimal maintenance due to robust design.
After-Sales Support:
Technical guidance via: Tel: +86 (577) 27869969
Email support: support@rockwill.com
Resources: https://www.cnrockwill.com
7. Why Choose This Solution?
Safety: Segregated compartments, front-access CTs, compliance with IEC/GB/DL standards.
Reliability: High-quality components, proven design, comprehensive testing.
Minimal Downtime: Draw-out breaker enables partial maintenance without shutdown.
Flexibility: Modular design simplifies expansion/modification.
Global Support: ROCKWILL’s 20+ years of expertise and direct technical support
