FKN12-12D Indoor High-Voltage Load Break Switch (LBS), a critical component of HT (High Tension) switchgear panels used in 12kV power distribution systems.
Key Components & Features
- Insulating Bushings (Red): These large, ribbed structures provide high-voltage insulation between the phases and to the ground.
- HRC Fuses (Brown/Grey Cylinders): High-rupturing capacity fuses are mounted vertically to provide short-circuit protection for equipment like transformers.
- Operating Mechanism: The side-mounted metal housing contains the spring-driven mechanism that allows for rapid "ON/OFF" switching, independent of the operator's manual force.
- Arc-Quenching Design: It uses compressed air (pneumatic) or air-blast technology to quickly extinguish electrical arcs during switching.
Technical Specifications
Based on typical ratings for this model series:
- Rated Voltage: 12 kV.
- Rated Current: Typically 630A for the load switch and up to 125A when combined with fuses.
- Frequency: 50 Hz or 60 Hz.
- Short-Circuit Breaking Capacity: Typically up to 31.5 kA when equipped with current-limiting fuses.
Applications
This switchgear is commonly used in:
- Secondary Substations: Especially in urban and rural power grids.
- Ring Main Units (RMU): To ensure uninterrupted power supply and protection against transient currents.
- Industrial Plants: For the control and protection of transformers, cables, and overhead lines.
