Description：

Gas Insulated Switchgear (GIS) is a 3-phase AC high-voltage solution engineered for precise control, measurement, protection, and switching of transmission lines. With over 5,000 installed bays globally, it has been exported to countries like Thailand and Equatorial Guinea, attesting to its international acclaim.

The ZF12B -72.5/126/145 (L) GIS integrates essential substation components, including circuit breakers, disconnectors, earthing switches, voltage transformers, current transformers, and surge arresters. Designed with a three-phase, single-enclosure layout, it streamlines functionality. Notably, its innovative 3-working-position DS/ES (disconnector/earthing switch) combination optimizes the structure, delivering a more compact and space-efficient solution.

Main Features：

• Space-Efficient Design: The 3-working-position DS/ES system offers a compact footprint, flexible configurations, physical mechanical interlocks, and enhanced reliability, ensuring seamless operation and safety.

• Low-Maintenance Operation: Its oil/gas-free mechanism simplifies construction, reduces upkeep requirements, and guarantees consistent, dependable performance.

• Robust Construction: Crafted from lightweight aluminum alloy, the enclosure minimizes temperature rise, resists corrosion, and ensures long-term durability.

• Superior Sealing: Double-sealing technology maintains exceptional gas tightness, with an annual leakage rate below 0.5%, safeguarding insulation integrity.

• Optimal Performance: Delivers outstanding insulating, conducting, and current-carrying capabilities, meeting the highest industry standards for power distribution.

Technical Parameters：

What is the principle of the protection function of gas-insulated switchgear?

Protection Function Principles:

• GIS equipment is equipped with various protection functions to ensure the safe operation of the power system.

Overcurrent Protection:

• The overcurrent protection function monitors the current in the circuit using current transformers. When the current exceeds a predefined threshold, the protection device triggers the circuit breaker to trip, cutting off the faulty circuit and preventing damage to the equipment due to overcurrent.

Short-Circuit Protection:

• The short-circuit protection function quickly detects short-circuit currents when a short-circuit fault occurs in the system and causes the circuit breaker to act rapidly, protecting the power system from damage.

Additional Protection Functions:

• Other protection functions, such as ground fault protection and overvoltage protection, are also included. These protection functions use appropriate sensors to monitor electrical parameters. Once any abnormality is detected, the protection actions are immediately initiated to ensure the safety of the power system and equipment.