The vacuum interrupter, also referred to as a vacuum switch tube, constitutes a critical element within high-voltage power switching devices. This component's primary function is to extinguish arcs through leveraging the superior insulating properties of a vacuum environment within high-voltage circuits, thereby rapidly suppressing current to prevent accidents and hazards. Widely employed across various sectors, the vacuum interrupter plays a pivotal role in electrical power transmission and distribution control systems. Its applications extend beyond these systems to include the metallurgical, mining, petroleum, chemical, railway, broadcasting, communication, and industrial high-frequency heating power distribution industries.
Characterized by its energy efficiency, material conservation, fire prevention capabilities, explosion protection, compact design, longevity, minimal maintenance requirements, operational reliability, and environmental friendliness, the vacuum interrupter represents a significant advancement in electrical technology. These features not only enhance the safety and efficiency of electrical systems but also contribute to the sustainability of operations in which they are integrated.
Vacuum interrupters can be categorized into two principal types: those designed for use in circuit breakers and those tailored for load switches. Circuit breaker-specific vacuum interrupters are predominantly utilized in substations and power grid installations within the power generation sector, serving as essential components for ensuring the stability and safety of the electrical network. Conversely, vacuum interrupters intended for load switches are more commonly applied at the consumer end of the power grid, facilitating efficient and safe electrical power distribution to end-users. Each type is meticulously engineered to meet the distinct requirements of its application, ensuring optimal performance and reliability in diverse operating condition
Technical Parameters
| Rated Frequency | 50 | Hz |
| Rated Voltage | 12 | kV |
| Rated Short-duration Withstand Voltage | 48 | kV |
| Rated Lightning Impulse Withstand Voltage | 85 | kV |
| Rated Current | 1250 | A |
| Circuit Resistance at the Lowest Rated Contact Force | ≤25 | μΩ |
| Rated Short-circuit Breaking Current | 25 | kA |
| Rated Short-circuit Breaking Current Breaking Times | 30 | Times |
| Rated Short-duration Withstand Current | 25 | kA |
| Rated Duration of Short-circuit | 4 | s |
| Rated Peak Withstand Current | 63 | kA |
| Rated Short-circuit Making Current | 63 | kA |
| Rated Operaing Sequence | O-0.3(0.5)s-CO-180s-CO | |
| Contact Stroke | 9±1 | mm |
| Contact Closing Force | 60±30 | N |
| Force Required to hold contacts open at full stroke | 140±30 | N |
| Average Opening Speed (first 75% stroke) | 1.2±0.2 | m/s |
| Average Closing Speed (last 30% stroke) | 0.6±0.2 | m/s |
| Rated Contact Force | 2000±200 | N |
| Contact Force at the Touch Point | 1400±100 | N |
| Contact Closing Bouncing Duration | ≤2 | ms |
| Contact Opening and Closing Non-simultaneity | ≤2 | ms |
| Contact Opening Rebound Amplitude | ≤2 | mm |
| Storage Life | 20 | Years |
| Mechanical Endurance | 10000 | Times |
| Contact Erosion Limit | 3 | mm |
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