Dead-tank SF₆ gas circuit breakers are mature, widely adopted core high voltage circuit breakers for medium and high voltage power transmission and distribution applications, serving as critical equipment to ensure the safe and stable operation of power grids.
As the mainstream high voltage circuit breaker for outdoor power transmission and transformation projects, it covers a rated voltage range of 40.5kV to 245kV, a short-circuit breaking current range of 25kA to 63kA, and a rated current range of 1600A to 4000A. Its comprehensive parameter range meets varying operational requirements from regional distribution networks to backbone power grids.
Engineered and manufactured in strict accordance with IEC and ANSI international standards, this high voltage circuit breaker reaches internationally advanced levels in core indicators including dielectric insulation performance, breaking capacity and mechanical endurance, making it the preferred solution for power grid construction and upgrading projects.
It is mainly designed for dead-tank installation in outdoor substations, with flexible three-phase and single-phase configuration options. It can be perfectly adapted to the scale, layout and grid planning of substations, meeting the demands of multiple scenarios including new substation commissioning and aging substation retrofitting.
It is suitable for various power transmission and transformation projects, including urban distribution network expansion, industrial park power supply, renewable energy power plant grid connection, and supporting projects for cross-regional transmission lines. As an indispensable high voltage circuit breaker in substation power distribution systems, it undertakes the core functions of circuit closing, opening and fault protection.
With excellent environmental adaptability, it maintains stable operation under harsh outdoor climatic conditions, delivers reliable circuit control and fault interruption for outdoor grid facilities, and serves as core supporting equipment for outdoor high voltage power distribution systems.
It supports customized production tailored to special on-site operating conditions (such as high altitude, high humidity and heavily corrosive environments) and technical requirements (including special voltage levels and breaking parameters), precisely meeting personalized demands of different projects and achieving perfect matching of circuit breakers with engineering scenarios.
It adopts a proven dead-tank structural design and uses SF₆ gas as high-performance insulation and arc-quenching media, equipped with a precision mechanical transmission system. This design ensures long-term trouble-free operation of the circuit breaker, featuring long mechanical service life and high operational stability, which greatly reduces Operation and Maintenance (O&M) costs.
The product portfolio covers a full range of voltage, current and breaking parameters, enabling simple and straightforward model selection without complex conversion. Standardized on-site installation procedures and highly versatile accessories support rapid installation and commissioning, shortening project construction cycles.
It features a compact structure with a small footprint, requiring no additional protective facilities for outdoor installation. The SF₆ gas sealing system delivers ultra-low leakage rates, eliminating the need for frequent gas refilling. Meanwhile, optimized maintenance procedures further reduce the full-lifecycle operating costs of the high voltage circuit breaker.
It adopts an innovative dual arc quenching design combining self-energy and puffer-type principles, which intelligently switches operating modes according to different short-circuit current conditions, ensuring fast and reliable interruption under various fault scenarios.
High Short-Circuit Breaking Current Conditions
Self-energy arc quenching technology is activated. Heat generated by the electric arc triggers rapid expansion of SF₆ gas in the expansion chamber, forming an ultra-high-speed airflow to extinguish the arc instantly. With strong breaking capacity, it can effectively isolate high-current faults and protect grid equipment from surge damage.
The mechanism switches to puffer-type operation. By mechanical compression, SF₆ gas in the compression chamber forms a directional high-pressure jet to accurately cool the arc root, achieving stable arc extinction, preventing arc re-ignition and improving breaking reliability under light-load fault conditions.
The combined application of dual arc quenching technologies endows the circuit breaker with a wider breaking range, faster response and superior arc extinguishing performance. It can reliably handle various short-circuit faults in power grids, providing comprehensive safety protection for power systems.
|
No |
Item |
Unit |
Parameters |
||||
|
1 |
Ratedmaximum voltage |
kV |
40.5 |
72.5 |
145 |
170 |
245 |
|
2 |
Ratedmaximum current |
A |
1600~4000 |
3150~4000 |
|||
|
3 |
Rated frequency |
Hz |
50/60 |
||||
|
4 |
1min Power frequency withstand voltage |
kV |
140 |
185/230/275 |
360/395/460 |
||
|
5 |
Lightning impulse withstand voltage |
kV |
325 |
450/550/650 |
850/950/1050 |
||
|
6 |
First open pole factor |
|
1.5 |
1.55 |
1.5 |
1.3 |
|
|
7 |
Rated short circuit breaking current |
kA |
25~40 |
40~63 |
|||
|
8 |
Rated short-circuit duration |
S |
4 |
3 |
|||
|
9 |
Rated out-of-phase breaking current |
|
10 |
||||
|
10 |
Rated cable(line)charging breaking |
|
10 |
50 |
125 |
||
|
11 |
Rated peak value withstand current |
kA |
100 |
80 |
125 |
||
|
12 |
Rated making current(peak) |
kA |
100 |
80 |
125 |
||
|
13 |
Creepage distance |
mm/kV |
25~31 |
||||
|
14 |
Operation sequence |
|
O-0.3s-CO-180s-CO |
||||
|
15 |
PartialDischarge |
|
10pC |
||||
|
16 |
Breaking time |
ms |
≤60 |
||||
|
17 |
Opening time |
ms |
≤30 |
||||
|
18 |
Closing time |
ms |
≤100 |
||||
|
19 |
SF6gas leakage rate(per year) |
|
≤1% |
||||
|
20 |
Rated SF6 gas pressure(20℃gauge |
Mpa |
0.5,0.4 |
0.5 |
0.6 |
||
|
21 |
Alarm/blocking pressure(20℃gauge |
Mpa |
0.45/0.4 |
0.45/0.40 |
0.55/0.50 |
||
|
22 |
SF6 annual gas leakage rate |
% |
≤0.5 |
||||
|
23 |
Gas moisture content |
Ppm(v) |
≤150 |
||||
|
24 |
Mechanical life |
times |
6000 |
||||
|
25 |
Heater voltage |
|
AC220 |
||||
|
26 |
Voltage of control circuit |
DC |
DC110,DC220,DC230 |
||||
|
27 |
Voltage of energy-store motor |
V |
DC 220/DC 110(AC 220)/DC230 |
||||
|
28 |
Applied standards |
|
GB/T1984,IEC 62271-100 |
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