0212 640 90 96

EHV Center-Break Outdoor Disconnectors (Up to 550kV )

Property Specification

Type: Extra-High-Voltage Outdoor Horizontal Center-Break Disconnector / Isolating Switch (up to 550 kV)

Features: Built for maximum operational longevity and low maintenance overhead, this switch handles system voltages up to 550 kV, continuous currents up to 4000 A, and short-time withstand currents up to 63 kA. Its low-friction kinematic linkage provides minimal electrical contact resistance, paired with dead-center mechanical interlocking for stable position retention under severe operating environments.

Applications: Extra-high-voltage (EHV) transmission substations, bulk power grid switching hubs, line and busbar isolation arrangements, and outdoor switchyards where versatile, space-flexible, and low-maintenance horizontal center-break switching is required.

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Description

Key Technical Performance Specifications

Technical Parameter / Electrical Rating 72.5 kV 123 kV 145 kV 170 kV 245 kV 300 kV 362 kV 420 kV 550 kV
Rated Maximum System Voltage 72.5 kV 123 kV 145 kV 170 kV 245 kV 300 kV 362 kV 420 kV 550 kV
Continuous Rated Operating Current Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A* Up to 4000 A*
Short-Time Withstand Current Capacity Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA Up to 63 kA
Power-Frequency Withstand Voltage: Phase-to-Ground 140 kV 230 kV 275 kV 325 kV 460 kV 395 kV 450 kV 520 kV 620 kV
Power-Frequency Withstand Voltage: Across Open Gap 160 kV 265 kV 315 kV 375 kV 530 kV 435 kV 520 kV 610 kV 800 kV
Lightning Impulse Withstand (BIL): Phase-to-Ground 325 kV 550 kV 650 kV 750 kV 1050 kV 1050 kV 1175 kV 1425 kV 1550 kV
Lightning Impulse Withstand (BIL): Across Open Gap 375 kV 630 kV 750 kV 860 kV 1200 kV 1050 (+170) kV 1175 (+205) kV 1425 (+240) kV 1550 (+315) kV
Switching Surge Impulse Withstand (SIL): Phase-to-Ground — — — — — 850 kV 950 kV 1050 kV 1175 kV
Switching Surge Impulse Withstand (SIL): Across Open Gap — — — — — 700 (+245) kV 800 (+295) kV 900 (+345) kV 900 (+450) kV

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