| Brand | ROCKWILL |
| Series | RHD |
| Rated maximum voltage | 145kV/170kV |
| Rated maximum current | 2000-4000A |
| Rated short-circuit breaking current | 31.5-50kA |
| Rated frequency | 50/60Hz |
Description
We are the pioneer in China's GIS tank circuit breaker industry and the country's first source factory specializing exclusively in this field.Outdoor 126kV High-voltage AC Dead tank SF6 circuit breaker is an outdoor - installed, three - pole, 50Hz AC high - voltage switching device that uses SF6 gas as the arc - extinguishing and insulating medium. It can be used to interrupt and close rated current and fault current, interrupt and close capacitor banks, transfer circuits, and also be used as a tie - circuit breaker to achieve the control and protection of power transmission and transformation lines and equipment. It is especially suitable for frequent operations. The circuit breaker is equipped with a spring operating mechanism.
Main Features
The material of the contact end is copper - tungsten alloy, which has strong arc - resistance ability. Especially during the opening and closing process of the circuit breaker, an arc will be generated, and a large amount of energy acts on the arcing contacts. Therefore, the ablation - resistant material is an important guarantee for the electrical life. The large and small nozzles are made of polytetrafluoroethylene material with excellent high - temperature and arc - resistance properties and appropriate fillers.
Technical specifications
Among these, some SF6 tank circuit breakers cover non-standard voltage levels including 100kV 123kV 126kV 138kV 145kV 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV, 756kV, and 800kV with a rated short-circuit breaking current of 50kA or 63kA, and we offer customization services.
Rated Voltage |
kV |
123kV 126kV 138kV 145kV |
|
Rated Current |
A |
3150A 4000A |
|
Rated Frequency |
Hz |
50/60 |
|
First - Pole - To - Clear Factor |
/ |
1.5 |
|
Rated Short - circuit Breaking Current |
kA |
40 |
|
Rated Short - time Withstand Current (Effective Value) |
kA/s |
40/4 |
|
Rated Peak Withstand Current |
kA |
100 |
|
Rated Power - frequency Withstand Voltage |
Phase - to - phase/Ground |
kV |
230 |
Break - port |
230(+73) |
||
Rated Lightning Impulse Withstand Voltage (1/250μs Peak Value) |
Phase - to - phase/Ground |
550 |
|
Break - port |
550(+103) |
||
SF₆ Gas (Gauge Pressure, 20℃) |
Rated Gas Pressure |
Mpa |
0.60 |
Alarm Gas Pressure |
0.55±0.015 |
||
Lock - out Gas Pressure |
0.50±0.015 |
||
Rated Operating Sequence |
/ |
O - 0.3s - CO - 180s - CO |
|
Rated Out - of - step Breaking Current |
kA |
10 |
|
Short - line Fault Breaking Current |
kA |
L90:36, L70:28 |
|
Asymmetrical - Phase Ground Fault Breaking Current |
kA |
34.8 |
|
Rated Line Charging Breaking Current |
A |
31.5 |
|
Rated Cable Charging Breaking Current |
A |
140 |
|
Number of Breaking Operations for Rated Short - circuit Breaking Current |
times |
20 |
|
Mechanical Life |
times |
10000 |
|
Mechanism/Operation Mode |
/ |
Spring Operating Mechanism/Three - phase Mechanical Interlock |
|
The interrupter is typically installed inside the tank, resulting in a highly compact overall structure that enables efficient arc quenching within a limited space. Depending on the arc extinguishing principle and technical approach, the specific configuration of the interrupter may vary, but all designs include core components such as moving/stationary contacts, a nozzle, and insulating parts. During opening operation to interrupt the current, these components work together to achieve fast and reliable extinction of the arc.
The leakage rate of SF₆ gas must be controlled at an extremely low level, typically not exceeding 1% per year. SF₆ gas is a potent greenhouse gas, with a greenhouse effect 23,900 times that of carbon dioxide. If a leak occurs, it can not only cause environmental pollution but also lead to a decrease in the gas pressure within the arc quenching chamber, affecting the performance and reliability of the circuit breaker.
To monitor the leakage of SF₆ gas, gas leakage detection devices are typically installed on tank-type circuit breakers. These devices help to promptly identify any leaks so that appropriate measures can be taken to address the issue.
During the normal operation and interruption processes of a circuit breaker, SF₆ gas can decompose, producing various decomposition products such as SF₄, S₂F₂, SOF₂, HF, and SO₂. These decomposition products are often corrosive, toxic, or irritating, and therefore require monitoring.If the concentration of these decomposition products exceeds certain limits, it may indicate abnormal discharges or other faults within the arc quenching chamber. Timely maintenance and handling are necessary to prevent further damage to the equipment and to safeguard personnel health.
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