SF6-free Dead Tank Circuit Breaker Direct Supply-72.5 kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Series	RVD
Rated voltage	72.5kV
Rated frequency	60 Hz
At lightning impulse	350kV
Rated normal current	1200/2000/3000 A
Rated short-circuit making current	100 kA

Description

Rockwill Group is a leading high-tech enterprise in China, specializing in the R&D, manufacturing, and sales of medium- and high-voltage switchgear and components for over 20 years. Following Pinggao Electric, XD Group, and XJ Electric, Rockwill Group is one of the few domestic manufacturers in China that has independently mastered the core technology of 72.5kV SF₆-free dead tank circuit breakers and successfully commercialized the product.

Based on this expertise, we have developed an SF₆-free dead tank circuit breaker (DTCB) that is very similar to its SF₆ predecessor. Using our g³ insulating and switching SF₆-free technology, the new RVD-72.5 remains compact with the same footprint. Performance and life cycle costs remain similar while offering a significant decrease in the carbon footprint.

The SF₆-free gas mixture used in the new RVD-72.5 works on the same well-known principle for insulation and breaking purposes as that of SF₆ gas. The g³ gas is a mixture of carbon dioxide (CO₂) with oxygen (O₂) and a small percentage of an additive (C4F7N), whose physical properties are essential to g³. Its contribution to global warming is significantly lower than that of SF₆ gas – reduced by 99%.

Main Characteristics

Advanced self-blast interrupters

Shares many components with the RHD-72.5 SF₆ circuit breaker
Durable low-energy spring-spring operated mechanisms
2 μs chopped wave 452 kV
Zero bar withstand capability

Easy System Integration

Breakers are completely factory assembled, wired and tested before shipment
Similar operational and maintenance procedures as with SF₆ circuit breakers
Compact design that’s common to all substation applications, including extension of existing substations

Technical specifications

IEC	VALUE	UNITS
Rated voltage	72.5	kV
Rated frequency	60	Hz
Rated insulation level at power frequency, dry at power frequency, wet	160	kV
	140	kV
At lightning impulse	350	kV
Rated normal current	1200/2000/3000	A
Rated short-circuit breaking current	40	kA
Rated short-circuit making current	100	kA
Rated break time	50	ms
Rated operating sequence	O-CO-15s-CO O-0.3s-CO-180s-CO

Dimensions

SF₆-free Dead Tank Circuit Breaker Dimensions

Environmental Conditions

Ambient air temperature upper limit	+40 °C
Ambient air temperature 24-hour average	+35 °C
Ambient air temperature lower limit	–30 °C
Altitude above sea level	≤ 1000 m
Relative humidity (24-hour average)	≤ 95%
Relative humidity (monthly average)	≤ 90%
Water vapor pressure (24-hour average)	≤ 2.2 kPa
Water vapor pressure (monthly average)	≤ 1.8 kPa
Solar radiation	≤ 1000 W/m²
Pollution level	Level III
Seismic capability	High seismic per IEEE 693

Application Scenarios

Urban & Industrial 72.5 kV Distribution Substations
Renewable Energy Step-Up / Grid Integration
Existing Substation Retrofit & Extension
High-Seismic Regions
Green / Eco-Sensitive Grid Projects

Documentation Resource Library SF₆-free Dead Tank Circuit Breaker

Public.

Rockwill Electric Group Profile

Brochure

English

PDF

FAQ for SF₆-free Dead Tank Circuit Breaker

What are the maintenance requirements?

Similar to SF₆ breakers — sealed-for-life gas system, factory-assembled and tested before shipment, low maintenance frequency.

Is the RVD-72.5 interchangeable with its SF₆ predecessor?

Yes. The RVD-72.5 shares the same dead-tank footprint and many components with the RHD-72.5 SF₆ breaker, with identical operational and maintenance procedures, enabling direct retrofit.

What insulating gas does the RVD-72.5 use, and is it SF₆-free?

It uses g³ gas — a mixture of CO₂, O₂ and a small percentage of C4F7N additive. It contains no SF₆ and reduces global warming potential by 99% versus SF₆.

$45000.00

Pricing calculator

PDF

Rockwill Electric Group Profile

Warranty by

Whole life care manager

Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.