High Quality LW8-40.5 Outdoor SF6 Circuit Breaker
Model and meaning
Overview
The LW8-40.5 circuit breaker is meticulously engineered for capacitor bank switching applications, demonstrating optimal adaptability in capacitor discharge scenarios within 750kV and 550kV substations. Leveraging the self - energy principle, it delivers outstanding operational performance: with a rated short - circuit making current of up to 50kA and a rated breaking current for capacitor banks reaching 3150A, its parameter performance ranks among the industry's top tier.Whether it is the interruption of high - voltage motors, operation of bus - connected reactors, switching of transformers, or complex working conditions such as line charging and small inductive current switching (including capacitive current switching, shunt reactor switching, and transformer no - load current switching), the LW8-40.5 circuit breaker handles them with ease, ensuring stable power system operation with its reliable performance.Featuring an SF6 inflatable tank combined with a short - stroke arc - extinguishing mechanism, it supports quick installation of both fixed and withdrawable types without dismantling the arc - extinguishing chamber. This allows direct installation in existing substations, significantly reducing installation time and labor costs, and providing a strong boost to the efficient advancement of power projects.
The spring operating mechanism is designed with flexibility and intelligence, supporting multiple modes including remote control, local operation, and manual emergency operation. This fully meets the diverse usage requirements in different scenarios, making operation more convenient and intelligent.
Product Parameters
| Serial Number | Name | Unit | Parameter | |||||||
| 1 | Rated voltage | KV | 40.5 | |||||||
| 2 | Maximum voltage | 40.5 | ||||||||
| 3 | Rated insulation level | Impulse withstand voltage (Range of impulse withstand voltages) | KV | Application: standardization 185 kV | ||||||
| Power - frequency withstand voltage | 95/118 (prefabricated) | |||||||||
| 4 | Rated Current | A | 1600/2000 | 1600/2000/25/315 | ||||||
| 5 | Mechanical service life | Times | 5000 | |||||||
| 6 | SF6 gas pressure at rated pressure (20 °C and standard pressure) | MPa | 0.4 | 0.5 | ||||||
| 7 | Three - phase pressure (20 °C and standard pressure) | MPa | 0.3 | 0.4 | ||||||
| 8 | Optimal ambient temperature for use | °C | -40 | -30 | ||||||
| 9 | Rated short - circuit making and breaking current | KA | 20 | 25 | 25 | 31.5 | ||||
| 10 | Rated short - circuit closing current | KA | 50 | 63 | 63 | 80 | ||||
| 11 | Rated short - time withstand current | KA | 20 | 25 | 25 | 31.5 | ||||
| 12 | Rated peak withstand current (dynamic withstand current) | KA | 50 | 63 | 63 | 80 | ||||
| 13 | Rated current deformation | KA | 5 | 6.3 | 6.3 | 8 | ||||
| 14 | Cumulative number of breaks at rated short - circuit closing | Times | 20 | |||||||
| 15 | Rated duration of short - circuit closing | S | 4 | |||||||
| 16 | Shock time (rated working voltage) | S | ≤ 0.1 | |||||||
| 17 | Unlocking time (rated working voltage) | S | ≤0.06 | |||||||
| 18 | Rated sequence of operations | S | Open - 03s - Close - Open - 180s - Close | |||||||
| 19 | Rated current introduction into one capacitor bank | A | 400 | |||||||
| 20 | Annual gas leakage rate | %/Year | ≤ 1 | |||||||
| 21 | Moisture content in SF6 gas (20 °C) | uL/L | ≤ 150 | |||||||
| 22 | Rated working voltage of the CT10 type mechanism spring | |||||||||
| Operating coils, voltage - sensing coils | V | Connection: 220/380 for direct currents; 48/110/220 | ||||||||
| Voltage on the accumulator | V | Connection: 220 for direct currents; 220/110 | ||||||||
| 23 | Weight of SF6 gas cylinder | KG | 5 | |||||||
| 24 | Disconnector (including mechanism, etc.) weight | KG | 1000 | |||||||
Appearance and installation dimensions
