| Brand | ROCKWILL |
| Model NO. | 300kV 330kV 362kV 363kV HV Dead Tank SF6 Circuit Breaker factory |
| Rated voltage | 363kV |
| Rated normal current | 4000A |
| Series | LW55 |
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.LW55 Series of SF6 Dead Tank Circuit Breaker, including LW55-252, LW55-363, LW55-550 and LW55-800, are used for making and breaking normal current, fault current and switching lines to realize the control, measurement and protection of power system.
With the advantages of excellent breaking performance, reliable mechanical properties, advanced tightness technology, high design parameters, the whole structure of circuit breaker is compact, with stable and reliable performance and long endurance.
Main Features:
The circuit breaker is of strong breaking capacity, long electrical endurance.
LW55 Series have excellent antiseismic and antipollution capacities, which make it suitable for those polluted places and higher elevation areas.
The oil pressure in hydraulic mechanism is automatic controlled and it can’t be affected by the temperature.
There are almost no external pipe for this new type of hydraulic operating mechanism, the possibility of oil leakage is reduced.
Technical Parameters:
Among these, some SF6 tank circuit breakers cover non-standard voltage levels including 138kV, 225kV, 230kV, 245kV, 275kV, 300kV 330kV, 345kV, 400kV, 756kV, and 800kV with a rated short-circuit breaking current of 50kA or 63kA, and we offer customization services.
Specifications |
unit |
value |
||||
Rated voltage |
kV |
252kV |
363kV |
550kV |
800kV |
|
Rated current |
A |
4000A |
5000A |
|||
Rated frequency |
Hz |
50/60 |
||||
Rated short-time withstand current (r.m.s) |
kA |
50 |
||||
Rated peak withstand current |
kA |
125 |
||||
1min power frequency withstand voltage (r.m.s) |
To earth/Between phases |
kV |
460 |
510 |
740 |
960 |
Across isolating distance |
460 + (154) |
510 + (210) |
740 + (315) |
960 + (460) |
||
Lightning impulse withstand voltage (peak) |
To earth/Between phases |
kV |
1050 |
1175 |
1675 |
2100 |
Across isolating distance |
1050 + (200) |
1175 + (295) |
1675 + (450) |
2100 + (650) |
||
Rated operating impulse withstand voltage (peak) |
To earth/Between phases |
kV |
950 |
1300 |
1550 |
|
Across isolating distance |
850 + (295) |
1175 + (450) |
1300 + (650) |
|||
Rated SF6 gas pressure (20℃) |
MPa |
0.6 |
||||
Rated SF6 annual leakage |
% |
≤0.5 |
||||
Integral Tank Structure: The breaker's arc quenching chamber, insulating medium, and related components are sealed within a metal tank filled with an insulating gas (such as sulfur hexafluoride) or insulating oil. This forms a relatively independent and sealed space, effectively preventing external environmental factors from affecting the internal components. This design enhances the insulation performance and reliability of the equipment, making it suitable for various harsh outdoor environments.
Arc Quenching Chamber Layout: The arc quenching chamber is typically installed inside the tank. Its structure is designed to be compact, enabling efficient arc quenching within a limited space. Depending on different arc quenching principles and technologies, the specific construction of the arc quenching chamber may vary, but generally includes key components such as contacts, nozzles, and insulating materials. These components work together to ensure that the arc is quickly and effectively extinguished when the breaker interrupts the current.
Operating Mechanism: Common operating mechanisms include spring-operated mechanisms and hydraulic-operated mechanisms.
Spring-Operated Mechanism: This type of mechanism is simple in structure, highly reliable, and easy to maintain. It drives the opening and closing operations of the breaker through the energy storage and release of springs.
Hydraulic-Operated Mechanism: This mechanism offers advantages such as high output power and smooth operation, making it suitable for high-voltage and high-current class breakers.
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.
