5/15/27/38 kV                                   1200/2000/3000 A

3-Second Short-Time Withstand Current: 40 kA                     Peak Withstand Current: 104 kA

38 kV BIL Lightning Impulse Withstand Voltage: 200 kV      Power-Frequency Withstand Voltage: 80 kV

Phase-Segregated Design | Three-Position Switch: Equipped with a digital camera. The IEEE C37.20.9 standard mandates that switchgear must feature a visible isolation gap, or possess a device—such as a camera—that allows for the observation of the disconnector's status.

Remote Operation and Monitoring System

Voltage Monitoring System | Operation, monitoring, and status verification of the device are all accessed from the front. This aligns with the standard requirements for North American switchgear, specifically the requirement for front-access installation and maintenance.

Gas-Insulated Switchgear (GIS) is suitable for use at altitudes up to 5,000 meters. Since the high-voltage live circuits are completely sealed within solid or gaseous insulating media, the impact of thin ambient air on external insulation—a concern for air-insulated switchgear—does not apply to GIS. Only atmospheric pressure affects the structural integrity of the gas enclosure; specifically, if the external atmospheric pressure is low while the internal gas pressure remains constant, the relative pressure increases. This can lead to more pronounced outward bulging of the gas enclosure shell; if the enclosure lacks sufficient structural strength, it may rupture, resulting in gas leakage. The phase-segregated cast aluminum enclosure offers high structural strength, ensuring that the increased relative pressure at high altitudes has no adverse effect on the enclosure's integrity.

IEEE C37.20.9 Gas-Insulated Switchgear

• IEEE C37.20.7 North American Standard for Internal Arc Fault Testing of Switchgear: Applicable to all medium- and low-voltage switchgear. Type 2B classification denotes switchgear with segregated medium- and low-voltage compartments; typically, internal arc fault tests for this type are conducted with the instrument compartment door open. Since each gas enclosure houses only a single phase, a three-phase arc fault cannot occur; only a single-phase arc fault is possible. • IEEE C37.09 AC Circuit Breakers

• IEEE C37.20.4 Disconnecting Switches

• IEEE Std 693 Seismic Qualification Standard

The Gas-Insulated Switchgear also complies with IEC standards:

• IEC 62271-200, LSC2B and AFLR

• IEC 62271-1 Common Specifications for High-Voltage Switchgear and Controlgear

• IEC 62271-100 High-Voltage AC Circuit Breakers

• IEC 62271-102 High-Voltage AC Disconnectors and Earthing Switches