Vacuum Interrupter Tube, or Vacuum Interrupter Chamber, is an interrupter chamber that uses vacuum as the interrupting medium, also known as Vacuum Interrupter Tube. Its main function is to provide reliable opening and closing capability in power systems, especially in switchgear requiring high reliability and long life.
The design and working principle of the vacuum interrupter gives it excellent arc extinguishing performance. In switchgear, when it is necessary to open a circuit, the contacts in the vacuum interrupter separate rapidly, generating an electric arc. Due to the high insulation strength of the vacuum medium and the rapid arc extinguishing ability, the arc will be quickly extinguished, thus realizing the opening of the circuit.
Vacuum interrupters have a wide range of applications in power systems, including but not limited to high-voltage circuit breakers, vacuum contactors, vacuum load switches and so on. Its advantages include high reliability, long life, simple maintenance, and strong breaking capacity.
What Types Of Vacuum Interrupter Tube Are There?
1. Classification by voltage level
Low-voltage vacuum interrupter: Applicable to low-voltage power systems, commonly used in household and commercial electrical equipment.
Medium-voltage vacuum interrupter: Applicable to medium-voltage power systems, widely used in industrial, commercial and public facilities.
High-voltage vacuum interrupter: Applicable to high-voltage power systems, commonly installed in large substations and transmission networks.
2. Classification by structure
Ceramic shell vacuum interrupter: Ceramic materials have good insulation properties and mechanical strength, and are often used to manufacture the shell of vacuum interrupter.
Glass shell vacuum interrupter: Glass shell vacuum interrupter has advantages in certain specific applications, such as higher transparency and better observability.
Metal shell vacuum interrupter: Metal shell can provide better mechanical protection and heat dissipation performance, suitable for high current and high temperature environment.
3. Classification by use
Circuit breaker vacuum interrupter: Specially designed for use in high-voltage circuit breakers to achieve reliable opening and closing of circuits.
Load switch vacuum interrupter: used in load switches, mainly used to open and close rated load current and overload current.
Contactor vacuum interrupter: used in electrical contactors to achieve frequent connection and disconnection of circuits.
4. Classification by special functions
Fast vacuum interrupter: has extremely fast breaking speed, suitable for occasions where the circuit needs to be cut off quickly.
Explosion-proof vacuum interrupter: designed with explosion-proof structure to prevent explosion in the event of internal faults.
Miniaturized vacuum interrupter: small in size, suitable for electrical equipment with limited space.
Technical Parameters
| MAIN TECHNICAL DATA | ||
| Data | Unit | Value |
| Rated Voltage | kV | 12 |
| Rated Current | A | 630 |
| Rated Frequency | Hz | 50 |
| Rated Short-duration Withstand Voltage(1min) | kV | 42 |
| Rated Lightning Impulse Withstand Voltage | kV | 75 |
| Rated Short-circuit Making Current | kA | 50 |
| Rated Peak Withstand Current | kA | 50 |
| Rated Short-duration Withstand Current | kA | 20 |
| Rated Duration of Short-circuit | s | 4 |
| Rated Active Load Breaking Capacity | A | 630 |
| Rated Cable-charging Breaking Current | A | 10 |
| Rated No-load Transformer Breaking Capacity | A | 3.15 |
| Rated Transfer Current | A | 3150 |
| Rated Take-over Current | A | 3150 |
| Mechanical Endurance | Times | 10000 |
| Contact Closing Force | N | 70±25 |
| Force Required to hold contacts open at full stroke | N | 130±40 |
| Circuit Resistance at the Lowest Rated Contact Force | μΩ | ≤40 |
| Contact Erosion Limit | mm | 3 |
| Internal Gas Pressure | Pa | ≤1.33x10-3 |
| Mass of Moving Parts | kg | ＜0.5 |
| Storage Life | Years | 20 |
| Data for Matchable VCB | ||
| Contact Stroke | mm | 9±1 |
| Average Opening Speed | m/s | 1.0±0.2 |
| Average Closing Speed | m/s | 0.6±0.2 |
| Rated Contact Force | N | 1000±100 |
| Contact Initial Pressure | N | 700±100 |
| Contact Closing Bouncing Duration | ms | ≤2 |
| Contact Opening and Closing Non-simultaneity | ms | ≤1 |
| Contact Opening Rebound Amplitude | mm | ≤2 |
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