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High voltage substations require circuit breakers that combine powerful fault interruption capability with long-term operational stability. The Tank Type SF6 Breaker is designed with a dead tank structure, where the interrupter chamber and live components are enclosed inside a grounded metallic tank filled with SF6 gas. This configuration provides enhanced operator safety, excellent insulation performance, and reliable switching under demanding grid conditions.
Unlike conventional live-tank designs, the dead tank construction offers better mechanical protection and simplified integration with current transformers (CTs), making it widely used in transmission substations, renewable energy collection stations, and industrial power networks. For medium-voltage applications, solutions such as the 66KV SF6 Circuit Breaker provide dependable switching performance, while higher voltage systems can utilize the 66KV Gas Insulated Circuit Breaker technology platform for compact substation layouts. The 66KV Outdoor SF6 Circuit Breaker series further demonstrates excellent weather resistance for outdoor installations.
The core advantage of the Tank Type SF6 Breaker is its grounded tank design. All high-voltage components are installed inside a sealed metal enclosure, reducing external insulation requirements and improving protection against environmental influences such as dust, humidity, salt fog, and temperature variations.
The SF6 gas functions as both insulation medium and arc-quenching medium. During circuit interruption, the puffer operating mechanism generates a high-pressure gas flow through the nozzle, rapidly cooling the arc and restoring dielectric strength after current zero crossing. This enables reliable interruption of high short-circuit currents while maintaining low contact erosion.
Integrated current transformers can be installed directly inside the tank, reducing external wiring complexity and minimizing substation footprint. Combined with a motor-charged spring operating mechanism, the breaker provides fast and stable opening and closing operations with reduced maintenance requirements.
| Parameter | Specification | Application Value |
|---|---|---|
| Rated Voltage | 72.5 / 123 / 145 kV | Suitable for high voltage transmission substations |
| Rated Frequency | 50 / 60 Hz | Compatible with global power systems |
| Rated Current | 2000 A / 3150 A | Supports high-capacity power transmission |
| Rated Short-Circuit Breaking Current | 31.5 kA / 40 kA | Reliable fault interruption capability |
| Rated Peak Withstand Current | 80 kA / 100 kA | Handles severe fault conditions |
| SF6 Gas Pressure (20°C) | 0.6 MPa | Stable insulation and arc extinction performance |
| Operating Sequence | O-0.3s-CO-3min-CO | Suitable for automatic protection schemes |
| Mechanical Endurance | M2 Class / 10,000 operations | Long service life with reduced maintenance |
| Opening Time | ≤60 ms | Fast fault isolation |
| Spring Charging Time | ≤15 s | Rapid system recovery |
| Control Voltage | 110 / 125 / 220 V DC | Compatible with substation control systems |
| Insulation Medium | SF6 Gas | High dielectric strength insulation |
| Operating Temperature | -40°C to +50°C | Suitable for harsh outdoor environments |
The Tank Type SF6 Breaker is widely applied in power transmission and distribution projects where high reliability and compact installation are required. Typical applications include:
As an experienced high voltage switchgear manufacturer, we provide complete solutions covering engineering design, production, testing, and technical support. Each Tank Type SF6 Breaker is tested according to IEC 62271-100 requirements, including dielectric withstand tests, mechanical operation tests, and gas leakage inspection.
With robust dead tank construction, proven SF6 interruption technology, and flexible configuration options, our breakers provide utilities and industrial customers with a dependable solution for modern high voltage power networks.
