General Rated Parameters
Rated Voltage: 24 kV
Rated Frequency: 50/60 Hz
Rated Continuous Current: 630 A
Rated Short-Time Withstand Current: 20 kA
Rated Short-Circuit Duration: 4 s
Rated Peak Withstand Current: 50/52 kA
Internal Arc Classification (arc test current IA, accessibility FL or FLR):
Arc Test Current: 20 kA
Test Duration tA: 1 s
Partial Discharge Test (≤26.4 kV): ≤10 pC
Power Frequency Withstand Voltage (0 gauge pressure, 20°C, 0.10 MPa, per IEC standards):
Phase-to-Phase & Phase-to-Earth, Load Break Switch Across Contacts: 50/60 kV
Rated Short-Time Power Frequency Withstand Voltage (Phase-to-Phase & Phase-to-Earth, Load Break Switch Across Contacts): 65/79 kV
Rated Lightning Impulse Withstand Voltage (Phase-to-Phase & Phase-to-Earth, Load Break Switch Across Contacts): 125/145 kV
Functional / Filling Pressure (20°C, Absolute Pressure): 0.15 MPa
Minimum Functional Pressure for Insulation / Switches (20°C, Absolute Pressure): 0.14 MPa
Sealing Test (Annual Leakage Rate): 0.01 %/Y
Continuity of Supply Level: LSC2
IP Protection Ratings (Gas Compartment / Enclosure / Isolation Compartment): IP68 / IP4X / IP2X
IK Protection Rating (Enclosure): IK08
Function Unit Ratings
C Function (Load Break Switch Unit)
Load Break Switch Electrical Endurance Class: E3, C2
Load Break Switch Mechanical Endurance Class: M1/M2(2)
Earthing Switch Electrical Endurance Class: E1/E2(2)
Earthing Switch Mechanical Endurance Class: M0/M1(3)
Rated Cable Charging Current: 50 A
Rated Line Charging Current: 10 A
Rated Earth Fault Breaking Current: 63 A
Rated Cable & Line Charging Breaking Current Under Earth Fault Conditions: 45 A
D Function (Vacuum Circuit Breaker Unit)
Vacuum Circuit Breaker Electrical Endurance Class: E3, C2
Vacuum Circuit Breaker Mechanical Endurance Class: M1/M2(2)
Earthing Switch Electrical Endurance Class: E1/E2(2)
Earthing Switch Mechanical Endurance Class: M0/M1(3)
Disconnector Mechanical Endurance Class: M0/M1(4)
Rated Line Charging Breaking Current: 10 A
Rated Cable Charging Breaking Current: 31.5 A
Rated First-Pole-to-Clear Factor (Kpp): 1.3 and 1.5
Rated Operating Sequence: O-0.3s-CO-15s-CO