Dead Tank SF6 Gas Circuit Breaker Original Manufacturer-145kV to 170kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Dead Tank SF6 Gas Circuit Breaker Original Manufacturer-145kV to 170kV
Rated voltage	145kV
Rated normal current	4000A
Rated frequency	50/60Hz
Rated short circuit breaking current	40kA
Series	RHD

Description

The 145kV to 170kV dead tank SF6 circuit breaker is a high-reliability high-voltage device designed to ensure stable operation of power systems. It adopts a dead tank structure, with live parts sealed in a metal casing filled with SF6 gas, ensuring rapid arc extinction and efficient fault current interruption to safeguard grid safety.

The low-center-of-gravity design gives it strong seismic resistance, adapting to harsh environments such as extreme climates. The equipment integrates bushings and current transformers to support multi-functional control such as measurement and protection.

With long mechanical/electrical life and a sealed structure, maintenance frequency is significantly reduced. Equipped with anti-misoperation interlocking devices, it ensures the safety of personnel and equipment. Widely used in power, metallurgy, transportation and other fields, it performs excellently in medium and high voltage scenarios.

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Product Advantages

Reliable & Maintenance-Free Mechanism: Spring-operated mechanism ensures stable operation and maintenance-free performance; mechanical life of 10,000 operations and electrical life of 20 operations (E2-M2-C2 class).
Superior Interrupting & Insulation Performance: Self-blast puffer hybrid interrupter chamber delivers strong interrupting capability and high continuous current rating; excellent insulation with low partial discharge, and 100% lightning impulse tested before delivery to eliminate insulation risks.
High-Quality Core Components: Insulators with proven reliability, strong corrosion resistance, and capable of withstanding magnitude-9 earthquakes, suitable for harsh environments.
Industry-Leading Technical Parameters: All parameters meet the highest industry standards; products and inspection criteria are recognized by State Grid Corporation of China and China Southern Power Grid.
Advanced R&D & Design: Leveraging finite element analysis, FMEA, and other advanced tools to achieve modular design, ensuring safety, stability, and ease of maintenance.
Stringent Quality Control: Supported by a premium supply chain and comprehensive internal management system, with end-to-end strict process control to guarantee long-term reliability.

Operation Mechanism

The enclosure has been verified to meet IP55 (dust-proof and water-jet resistant) and IK10 (impact-resistant) protection ratings, and is designed to operate across a wide temperature range from -40℃ to 55℃.

The cabinet adopts an integrated bending technique, offering an artistic appearance, high structural strength, and excellent impermeability. All internal components are sourced from internationally renowned brands, ensuring reliable quality and long-term stable performance.

Operation Mechanism

Technology Parameters

N	Item	Unit	145 kV	170 kV
1.	Rated maximum voltage	kV	145	170
2.	Rated maximum current	A	2500~4000	2500~4000
3.	Rated frequency	Hz	50/60	50/60
4.	Lightning impulse withstand voltage	kV	650/750	750/860
5.	Rated short‑circuit breaking current	kA	31.5~50	31.5~50
6.	Rated peak withstand current	kA	100~125	100~125
7.	Creepage distance	mm/kV	25~31	25~31
8.	Partial discharge	pC	≤10	≤10
9.	Opening time	ms	≤30	≤30
10	Alarm/blocking pressure	MPa	0.45/0.40	0.55/0.50
11	Gas moisture content	ppm(v)	≤150	≤150
12	Heater voltage	V	AC220	AC220
13	Voltage of energy‑store motor	V	DC110/220	DC110/220
14	1min Power frequency withstand voltage	kV	275/315	325/365
15	First open pole factor		1.5	1.5
16	Rated short‑circuit duration	s	3	3
17	Rated cable/line charging breaking current	A	160~2100	160~250
18	Rated making current (peak)	kA	100~125	100~125
19	Operation sequence		O‑0.3s‑CO‑180s‑CO	O‑0.3s‑CO‑180s‑CO
20	Breaking time	ms	≤60	≤60
21	Closing time	ms	≤100	≤100
22	Rated SF₆ gas pressure	MPa	0.5~0.6	0.6~0.7
23	SF₆ annual gas leakage rate	%	≤0.5	≤0.5
24	Mechanical life	times	10000	10000
25	Voltage of control circuit	V	DC110/220	DC110/220
26	Applied standards		GB/T 1984 / IEC 62271‑100

RHD-145 Dead-Tank SF₆ Gas Circuit Breaker Diagram

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Environmental Conditions

Item	Value
Max ambient air temperature	+40°C
Max 24h average ambient air temperature	+35°C
Min ambient air temperature	-25°C
Altitude	≤ 1000 m
Max relative humidity (24h average)	≤ 95%
Max relative humidity (1 month average)	≤ 90%
Max water vapor pressure (24h average)	2.2 kPa
Max water vapor pressure (1 month average)	1.8 kPa
Solar radiation	≤ 1000 W/m²
Pollution level	II

Documentation Resource Library Dead Tank Circuit Breaker

Public.

RHD-145 SF6 Gas Dead tank Circuit Breaker

Drawings

English

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RHD-170 SF6 Gas Dead tank Circuit Breaker FLYER

Brochure

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Public.

Rockwill Electric Group Profile

Brochure

English

PDF

Public.

RHD-145 SF6 Gas Dead tank Circuit Breaker FLYER

Brochure

English

PDF

Restricted.

138kV Dead‑Tank Circuit Breaker Technical Specification | IEEE & ANSI Compliant

Technical Data

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138kV Dead-Tank Circuit Breaker Technical Specification | IEC Compliant

Technical Data

Chinese

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RHB Hybird Switchgear Catalog

Selection Guide

English

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FAQ for Dead Tank Circuit Breaker

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.

What are the characteristics of high-voltage vacuum circuit breakers ?

Special Arc-Extinguishing Chamber: Needs larger volume (tens of mm electrode spacing), high-purity copper electrodes, and stricter vacuum (10⁻⁶~10⁻⁸Pa) to meet enhanced insulation/arc tolerance at high voltage. Optimized electrode shapes suppress arc diffusion.
Breaking Capacity & Lifespan: Handles 25kA~63kA short-circuits via multi-break or magnetic arc tech. Mechanical lifespan reaches 5,000~10,000 cycles, suiting frequent operations (e.g., new energy grids).
Reinforced Insulation: Internal insulation relies on high vacuum; external uses large-diameter ceramic/composite shells (≥25mm/kV creepage for 252kV) with extra skirts for high altitudes (>3000m).
Eco & O&M Advantages: No SF₆, uses recyclable materials. O&M only needs checking mechanisms/shells, cycle 1~2 years, cost 30%~50% lower than SF₆ breakers.

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.

$3000.00

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RHD-145 SF6 Gas Dead tank Circuit Breaker

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RHD-170 SF6 Gas Dead tank Circuit Breaker FLYER

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Rockwill Electric Group Profile

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RHD-145 SF6 Gas Dead tank Circuit Breaker FLYER

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