Product Description

The RHD-252KV Dead-Tank SF6 Circuit Breaker, is a high-reliability high-voltage electrical device tailored for 220kV and above power transmission and transformation systems. As a core product of the RHD series, it inherits the series’ excellent industrial quality and integrates advanced high-voltage technologies. Its primary functions include distributing combined load currents, interrupting fault currents promptly, and realizing effective control, measurement, and protection of transmission lines. With a compact dead-tank structure that encapsulates key components in a metal casing filled with SF6 gas, the breaker ensures stable operation even in harsh environments, making it an ideal choice for upgrading high-voltage power grids.

Key Features

1. Superior Seismic Resistance：Adopting a low-center-of-gravity design, the breaker can withstand an earthquake intensity of up to 9 degrees, ensuring stable performance in seismic-prone areas—consistent with the RHD series’ proven anti-seismic capability.
2. Excellent Arc-Extinguishing Performance & Long Service Life：Leveraging the high arc-extinguishing efficiency of SF6 gas, the breaker achieves a rated short-circuit breaking current of ≥50kA. It boasts an electrical life of more than 20 operations and a mechanical life of up to 10,000 cycles, significantly reducing equipment replacement and maintenance costs.
3. Low SF6 Gas Leakage Rate：The hermetic metal tank structure minimizes SF6 gas leakage, with an annual leakage rate of ≤1%—far below industry averages. This design not only avoids safety hazards from gas leakage but also reduces environmental impact.
4. Modular Design & Flexible Expansion：It supports on-demand configuration of built-in current transformers (CTs), with up to 15 CTs available for measurement or protection purposes. The standardized module interface allows flexible combination to meet diverse substation design and layout requirements, especially suitable for space-constrained scenarios.
5. Strong Environmental Adaptability：The breaker operates stably in extreme conditions: ambient temperature ranging from -40℃ to +55℃, maximum daily temperature difference of 32K, altitude up to 3,000m, and air pollution level up to Class IV. It also resists wind pressure of 700Pa (equivalent to 34m/s wind speed) and icing thickness of up to 20mm.
6. Comprehensive Safety Protection：Equipped with anti-misoperation interlocking devices, it effectively prevents accidents caused by incorrect operations. Before delivery, the breaker undergoes lightning impulse tests to eliminate insulation discharge risks from production and assembly, ensuring reliable quality.
7. Maintenance-Free Operating Mechanism：It adopts a spring-operated mechanism that is oil-free, gas-free, and maintenance-free. This mechanism delivers stable performance, low noise, and high reliability, reducing long-term operational workload.
8. Compliance with International Standards：The product fully meets the requirements of GB/T 1984 and IEC 62271-100 standards, ensuring compatibility with global high-voltage power grid systems and facilitating international project applications..

Main characteristics

Electrical

Mechanical

Application Scenarios

1. Large-Scale Hub Substations：Ideal for 220kV and above key hub substations, it undertakes the core task of controlling and protecting the main power supply circuit, ensuring stable power transmission to urban and industrial areas.
2. New Energy Bases：Suitable for high-voltage grid-connection systems of wind power and photovoltaic bases. Its excellent fault-interrupting capability and environmental adaptability guarantee reliable integration of renewable energy into the main grid.
3. Cross-Regional Power Transmission Projects：Used in long-distance cross-regional power transmission lines, it effectively isolates fault points to prevent power outages from spreading, maintaining continuous and stable power supply between regions.