LN22 HIGH VOLTAGE SULFUR HEXAFLUORIDE CIRCUIT BREAKER
Product Overview
LN22 indoor high-voltage sulfur hexafluoride circuit breaker (hereinafter referred to as circuit breaker) is suitable for three-phase AC 50Hz, rated voltage 40.5kV power system, and can be used for breaking load current, overload current, and fault current in industrial and mining enterprises, power plants, and substations.
The circuit breaker and operating mechanism adopt an upper and lower layout structure, effectively reducing the depth of the circuit breaker.
The three-phase arc extinguishing chamber and the connected charged body are isolated by three independent epoxy resin insulation cylinders, forming a composite insulation structure. The circuit breaker meets the air distance and creep distance requirements under normal operating conditions and effectively reduces the volume of the circuit breaker. The main electrical circuit vacuum arc extinguishing chamber and the dynamic static conductive connection are installed inside the insulation cylinder, so that the phase spacing is only 300mm. The electrical connections of the main circuit are all fixed connections, which have high reliability. The insulation cylinder is installed above the circuit breaker frame.
The spring operating mechanism specially designed for this new type of circuit breaker is installed within the circuit breaker frame, and its structural characteristics are more suitable for the upper and lower layout of the circuit breaker, becoming an integral part of the overall structure of the circuit breaker. The structure design is simple, and the output curve and performance are more suitable for the characteristics and requirements of 40.5kV vacuum circuit breakers.
The overall layout is reasonable, beautiful, and concise. Small size, flexible operation, reliable electrical performance, long service life, convenient maintenance, and maintenance free mechanism.
This circuit breaker is suitable for frequent operation, various occasions, and places with harsh operating conditions.
Main Technical Parameters
| Item | Unit | Data |
| Rated voltage | kV | 40.5 |
| 1 min Power frequency withstand voltage (valid value) | kV | 95 |
| Lightning impulse withstand voltage (peak) | kV | 185 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630，1250, 1600, 2000 |
| Rated short-time withstand current | kA | 25, 31.5 |
| Rated peak withstand current | kA | 63, 80 |
| Rated short circuit duration | s | 4 |
| Rated short-circuit breaking current | kA | 25, 31.5 |
| Rated short circuit switching current | kA | 63, 80 |
| Rated operation sequence | O-0.3s-CO-180s-CO | |
| Breaking duration | ms | <80 |
| Rated short circuit breaking current breaking times | Times | 30 |
| rated operation voltage | V | AC110, 220; DC110,220 |
| Mechanical life | Times | 10000 |
Appearance And Installation Dimensions
