Maintenance-Free HV Dead-Tank SF6 Circuit Breaker for Large-Scale Substations-230kV to 252kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Maintenance-Free HV Dead-Tank SF6 Circuit Breaker for Large-Scale Substations-230kV to 252kV
Rated voltage	230kV
Rated frequency	50/60Hz
Rated short circuit breaking current	50kA
Series	RHD

Description

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

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.
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.
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.
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.
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.
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.
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.
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

Voltage Ratings: 3.6kV, 4.76kV, 7.2kV, 8.25kV, 11kV, 12kV, 13.2kV, 13.8kV, 15kV, 15.5kV, 17.5kV, 22kV, 22.9kV, 24kV, 25.8kV, 27kV, 33kV, 36kV, 38kV, 40.5kV, 44kV, 60kV, 63kV, 66kV, 69kV, 88kV, 115kV, 123kV, 125kV, 126kV, 132kV, 138kV, 145kV, 150kV, 170kV, 184kV, 204kV, 220kV, 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV, 765kV, 800kV with a rated short-circuit breaking current of 50kA or 63kA, and we offer customization services.

Item	Unit	Parameters
Rated maximum voltage	kV	230kV/245kV/252kV
Rated maximum current	A	1600/2500/3150/4000
Rated frequency	Hz	50/60
1min Power frequency withstand voltage	kV	460
Lightning impulse withstand voltage	kV	1050
First open pole factor		1.5/1.5/1.3
Rated short circuit breaking current	kA	25/31.5/40/50/63
Rated short - circuit duration	s	4/3
Rated out - of - phase breaking current		10
Rated cable charging current		10/50/125
Rated peak value withstand current	kA	80/100/125
Rated making current (peak)	kA	80/100/125
Creepage distance	mm/kV	25 - 31
SF6 gas leakage rate (per year)		≤1%
Rated SF6 gas pressure(20℃ gauge pressure)	Mpa	0.5
Alarm/blocking pressure(20℃ gauge pressure)	Mpa	0.45
SF6 annual gas leakage rate		≤0.5
Gas moisture content	Ppm(v)	≤150
Heater voltage		AC220/DC220
Voltage of control circuit	DC	DC110/DC220/DC230
Voltage of energy - store motor	V	DC 220/DC 110/AC 220/DC230
Applied standards		GB/T 1984/IEC 62271 - 100

Mechanical

Name	unit	Parameters
Opening time	ms	27±3
Closing time	ms	90±9
Minute and conjunction time	ms	300
Together--ivide the time	ms	≤60
Simultaneity of opening	ms	≤3
Closing simultaneity	ms	≤5
Moving contact stroke	mm	150+2-4
Contact contact stroke	mm	27±4
Opening speed	m/s	4.5±0.5
Closing speed	m/s	2.5±0.4
Mechanical life	times	6000
Operation sequence		O - 0.3s - CO - 180s - CO
Note: The opening and closing speed and time are the characteristic values of the circuitbreaker when it is single divided and closed under rated conditions. The closing speed is theaverage speed of the moving contact from the rigid closing point to 10 ms before closing, andthe opening speed is the average speed of the moving contact within 10 ms from the justequinox to 10 ms after the separation.

Application Scenarios

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.
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.
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.

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FAQ for Dead Tank Circuit Breaker

Q: What applications are a live tank breaker and a dead tank breaker each best suited for?

Live tank breakers are well-suited for outdoor high-voltage distribution with a dispersed layout. Dead tank breakers flexibly adapt to both indoor and outdoor applications, especially in space-constrained substations or where compact installation is required.

Q: What is the fundamental difference between a vacuum circuit breaker (VCB) and an SF₆ circuit breaker?

The core difference is the arc-extinguishing medium. A VCB uses a high vacuum inside a sealed ceramic or glass envelope — the vacuum rapidly diffuses ions and metal vapor after current zero, achieving arc extinction in <10 ms. An SF₆ CB uses sulfur hexafluoride gas, which has strong electron affinity — it captures free electrons to form heavy negative ions, quickly depleting the arc channel's conductivity.

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RHD-245 SF6 Gas Dead tank Circuit Breaker

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