- Detail
Overview
The ZN63(VS1)-24 type indoor high-voltage vacuum circuit breaker is an indoor switchgear for three-phase AC 50Hz power systems with a rated voltage of 24kV, serving as a protection and control unit for power grid equipment and industrial and mining enterprise power equipment. It is suitable for occasions requiring frequent operation under rated working current or multiple interruption of short-circuit current.
This circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, which can be used as a fixed installation unit or equipped with a dedicated trolley mechanism to function as a withdrawable unit.
Model Meaning
Main Technical Parameters
| Serial No. | Item | Unit | Data | |||
| 1 | Rated Voltage | kV | 24 | |||
| 2 | Rated Short-time Power Frequency Withstand Voltage (1min) | kV | 65/79 (Phase-to-phase, Phase-to-ground / Break) | |||
| 3 | Rated Lightning Impulse Withstand Voltage (Peak) | kV | 125/145 (Phase-to-phase, Phase-to-ground / Break) | |||
| 4 | Rated Frequency | Hz | 50 | |||
| 5 | Rated Current | A | 630 | 630 1250 | 630 1250 | |
| 1250 | 1600 2000 | 1600 2000 | ||||
| 2500 3150 | 2500 3150 | |||||
| 6 | Rated Short-circuit Breaking Current | kA | 20/25 | 31.5 | 40 | |
| 7 | Rated Short-time Withstand Voltage | kA | 20/25 | 35.5 | 40 | |
| 8 | Rated Short-circuit Duration | s | 4 | |||
| 9 | Rated Peak Withstand Current | kA | 50/63 | 80 | 100 | |
| 10 | Rated Short-circuit Making Current | kA | 50/63 | 80 | 100 | |
| 11 | Secondary Circuit Power Frequency Withstand Voltage (1min) | V | 200 | |||
| 12 | Rated Single / Back-to-Back Capacitor Bank Breaking Current | A | 630/400 (800/400 for 40kA) | |||
| 13 | Rated Capacitor Bank Combination Inrush Current | kA | 12.5 (Frequency not greater than 1000Hz) | |||
| 14 | Mechanical Life | times | 20000 | |||
| 15 | Rated Current Breaking Times (Electrical Life) | times | 20000 | |||
| 16 | Rated Short-circuit Current Breaking Times | times | 50(40kA ≤ 30) | |||
| 17 | Allowable Cumulative Wear Thickness of Moving and Static Contacts | mm | 3 | |||
| 18 | Energy Storage Time | s | ≤ 10 | |||
| 19 | Contact Opening Distance | mm | 16±1 | |||
| 20 | Over Travel | mm | 3.5±0.5 | |||
| 21 | Contact Closing Bounce Time | ms | ≤ 2(40kA ≤ 3) | |||
| 22 | Three-phase Open/Close Non-simultaneity | ms | ≤ 2 | |||
| 23 | Average Opening Speed (Contact Separation - 8mm) | m/s | 1.5±0.2 | |||
| 24 | Average Closing Speed (8mm - Contact Closure) | m/s | 0.8±0.2 | |||
| 25 | Main Circuit Resistance | μΩ | <50 (630A) ≤ 45 (1250A) ≤ 35 (1600-2000A) ≤ 25(2500A and above) | |||
| 26 | Rated Operating Sequence | Open-0.3S-Close-Open 180S-Close-Open | ||||
Appearance and Installation Dimensions
