Product Introduction
The LW16-40.5 outdoor SF6 circuit breaker is designed for use in a 50 Hz three-phase AC power system and is suitable for control and protection in industrial enterprises, power plants, and substations. This product is capable of frequent operations and can be used as a link circuit breaker and for switching capacitor banks or reactor banks. The internal current transformers can be used for measurement and protection. It can directly replace the SW2-35 oil circuit breaker and, with the addition of an overcurrent bracket, can replace various models of oil circuit breakers. It is an ideal oil-free circuit breaker for 35 kV power systems.
Note: When the circuit breaker is in hot standby mode, surge arresters must be installed on the fault side of the breaker.
Main Technical Parameters of Circuit Breaker
| No. | Parameter Name | Unit | Parameter Value |
| 1 | Rated voltage | kV | 40.5 |
| 2 | 1-Minute power frequency withstand voltage | kV | 95 (Grounded) / 185 (Contact gap) |
| 3 | Rated frequency | Hz | 50 |
| 4 | Rated current | A | 1600, 2000 |
| 5 | Rated short-circuit breaking current | kA | 25 (reclosing), 31.5 (single separation) |
| 6 | Rated short-circuit making current (peak) | kA | 63 |
| 7 | Rated short-time withstand current | kA | 25 |
| 8 | Rated short circuit duration | s | 4 |
| 9 | Rated peak withstand current | kA | 63 |
| 10 | Rated operating sequence | – | O—0.3s—CO—180s—CO |
| 11 | Rated switching current for a single capacitor bank | A | 400 |
| 12 | Rated out-of-step breaking current | kA | 6.3 |
| 13 | Rated out-of-phase breaking current | kA | 21.75 |
| 14 | Mechanical life test | Times | 3000 |
| 15 | Rated cumulative breaking times (rated current) | Times | 2000 |
| 16 | Rated cumulative breaking times (25kA short-circuit) | Times | 21 |
| 17 | Tripping time | s | ≤0.06 (rated/max voltage) / ≤0.10 (min voltage) |
| 18 | Closing time | s | ≤0.15 |
| 19 | SF6 gas rated pressure (20℃ gauge pressure) | MPa | 0.60±0.015 |
| 20 | SF6 gas refill alarm pressure (20℃ gauge pressure) | MPa | 0.55±0.015 |
| 21 | SF6 gas minimum functional pressure (20℃ gauge) | MPa | 0.52±0.015 |
| 22 | SF6 gas annual leakage rate | %/Year | ≤1 |
| 23 | SF6 gas trace moisture content | ppm (V/V) | ≤150×10⁻⁶ |
| 24 | CT14-A mechanism coil rated voltage | V | DC: 110/220; AC: 220/380 |
| 25 | SF6 gas weight | kg | Normal: 2.5; CT: 6; Elevated CT: 8 |
| 26 | Circuit breaker weight | kg | 1000 |
| 27 | External insulation leakage specific distance | mm/kV | ≥31 |
| 28 | Porcelain insulator leakage distance | mm | ≥1255 |
Notes:
O: Open operation
CO: Close-Open operation
s: Seconds
ppm: Parts per million
CT: Current Transformer configuration
Formatting Consistency:
- Values with tolerances (e.g., ±0.015) and conditional parameters (e.g., reclosing/single separation) are explicitly stated.
- Units standardized (e.g., “kV” for kilovolts, “MPa” for megapascals).
- Scientific notation corrected (e.g., “≤150×10⁻⁶” instead of “X10-6”).
- Combined entries (e.g., tripping time under different voltages) are merged for clarity.
