High-Performance LW36-40.5 Circuit Breaker for High-Voltage Applications
Model and meaning
Overview
The LW36 - 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 LW36 - 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 | Rated operating voltage (1min) | To earth | K-95 | |||||
| Between breaks | K-(95+23) | |||||||
| 3 | Rated switching overvoltage | To earth | K-185 | |||||
| Between breaks | K-(185+33) | |||||||
| 4 | Rated frequency | HZ | 50 | |||||
| 5 | Rated current | A | 2500 | |||||
| 6 | Opening coefficient | KA | 1.5 | |||||
| 7 | Rated short - circuit making | 31.5 | ||||||
| 8 | Rated short - circuit closing current | 80 | ||||||
| 9 | Rated electrical short - circuit making current | 31.5 | ||||||
| 10 | Rated thermal withstand current | 80 | ||||||
| 11 | Rated duration of short - circuit making | S | 4 | |||||
| 12 | Rated current limitation | KA | 8 | |||||
| 13 | Rated capacitor bank breaking current | A | 630 | |||||
| 14 | Rated cable charging and breaking current | A | 50 | |||||
| 15 | Rated sequence of operations | O - 0.3s - CO - 180s - CO | ||||||
| 16 | Rated sequence of operations | μΩ | Microscopic tomography, Huaan - 40 (without current transformer) | |||||
| 17 | Simulation/treatment of the test circuit | 0.5 | ||||||
| 18 | Signaling of nominal functional pressure (pressure in table 20s) | 0.47 / 0.45 ± 0.015 | ||||||
| 19 | Gas leakage coefficient per year for SF6 | MPA | ≤ 0.5% | |||||
| 20 | SF6 gas content (V/V) | ≤ 150 × 10 - 6 | ||||||
| 21 | Mechanical service life | times | 10000 | |||||
| 22 | Distance of separation | Between breaks | mm | ≥ 1256 | ||||
| To earth | ≥ 1256 | |||||||
| 23 | Each arc - extinguishing chamber filled with SF6 gas mass | KG | 6 (with built - in current transformer)；5 (without) | |||||
| 24 | Mass of each circuit breaker | AC | KG | 1000 (with built - in current transformer)；800 (without) | ||||
Appearance and installation dimensions
