Property Specification

Type: Ultra-High-Voltage Outdoor Horizontal Knee-Type Disconnector / Isolating Switch (rated up to 800 kV)

Features: Engineered to optimize installation space across both vertical and horizontal dimensions, this switch offers exceptional operational dependability with low maintenance needs for system parameters up to 800 kV, 3150 A, and 50 kA short-circuit withstand. Key structural features include a self-aligning contact layout, a springless contact architecture engineered to eliminate unintended opening during short-circuit electromagnetic stress, minimized electrical path resistance, and a highly stable opening/closing kinematic trajectory.

Applications: Ultra-high-voltage (UHV) grid substations, highly compact switchyards with restricted plot areas, and high-voltage power transmission installations requiring minimal horizontal and overhead vertical clearance.

Description

Key Technical Performance Specifications

Technical Parameter / Electrical Rating	800 kV
Rated Maximum System Voltage	800 kV
Continuous Operational Current	3150 A
Short-Time Thermal Withstand Current	50 kA ( $3\text{ s}$ )
Power-Frequency Withstand Voltage: Phase-to-Ground	830 kV
Power-Frequency Withstand Voltage: Across Open Gap	1150 kV
Lightning Impulse Withstand (BIL): Phase-to-Ground	2100 kV
Lightning Impulse Withstand (BIL): Across Open Gap	2100 (+455) kV
Switching Surge Impulse Withstand (SIL): Phase-to-Ground	1550 kV
Switching Surge Impulse Withstand (SIL): Inter-Phase	2480 kV
Switching Surge Impulse Withstand (SIL): Across Open Gap	1175 (+650) kV