In the field of electrical engineering, a vacuum interrupter is a sophisticated switching device that employs electrical contacts housed within a vacuum-sealed enclosure. This technology serves as a fundamental component in medium-voltage circuit breakers, generator circuit breakers, and high-voltage circuit breakers, where it excels due to its ability to reliably interrupt electrical currents under extreme conditions. When the electrical contacts separate, a metal vapor arc is formed; however, due to the vacuum environment, this arc is rapidly quenched, effectively preventing the continuation of current flow.
Vacuum interrupters find extensive application in a variety of critical systems, including utility power transmission networks, power generation units, and power distribution systems for railways, arc furnace operations, and industrial facilities. A key advantage of vacuum interrupters is their compact design, which is made possible by the containment of the arc within the interrupter itself. This feature allows switchgear equipped with vacuum interrupters to occupy significantly less space compared to alternatives that rely on air, sulfur hexafluoride (SF6), or oil as arc-quenching media.
The versatility of vacuum interrupters is further highlighted by their dual application in both circuit breakers and load switches. In the context of circuit breakers, vacuum interrupters are predominantly deployed within the power sector, specifically in substations and power generation facilities, where they play a crucial role in maintaining the integrity and safety of the electrical grid. On the other hand, load-switching vacuum interrupters are designed for use by end users of the power grid, providing a reliable means of managing electrical loads in residential, commercial, and industrial settings.
By offering a combination of efficiency, reliability, and space-saving design, vacuum interrupters represent a significant technological advancement in the realm of electrical engineering, contributing to the enhanced performance and safety of modern electrical systems.
Technical Parameters
| MAIN TECHNICAL DATA | ||
| Data | Unit | Value |
| Rated Voltage | kV | 1.14 |
| Rated Current | A | 6300 |
| Rated Frequency | Hz | 50/60 |
| Rated Short-duration Withstand Voltage(1min) | kV | 5 |
| Rated Lightning Impulse Withstand Voltage | kV | 8 |
| Rated Short-circuit Breaking Current | kA | 300 |
| Rated Short-circuit Breaking Current Breaking Times | Times | 30 |
| Rated Peak Withstand Current | kA | 300 |
| Rated Short-duration Withstand Current | kA | 120 |
| Rated Duration of Short-circuit | s | 4 |
| Mechanical Endurance | Times | 10000 |
| Contact Closing Force | N | 600±100 |
| Force Required to hold contacts open at full stroke | N | 1000±200 |
| Circuit Resistance at the Lowest Rated Contact Force | μΩ | ≤6 |
| Contact Erosion Limit | mm | 1 |
| Internal Gas Pressure | Pa | ≤1.33x10-3 |
| Mass of Moving Parts | kg | ≤6.5 |
| Storage Life | Years | 20 |
| Data for Matchable VCB | ||
| Contact Stroke | mm | 6±1 |
| Average Opening Speed | m/s | 1.1±0.2 |
| Average Closing Speed | m/s | 0.6±0.2 |
| Rated Contact Force | N | 2200±200 |
| Contact Initial Pressure | N | 1550±150 |
| Contact Closing Bouncing Duration | ms | ≤2 |
| Contact Opening and Closing Non-simultaneity | ms | ≤1 |
| Contact Opening Rebound Amplitude | mm | ≤2 |
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