According to IEC/IEEE 62271-37-013, vacuum circuit breakers can be certified as generator circuit breakers (GCBs). Compared to circuit breakers utilizing other arc-quenching media, such as sulfur hexafluoride (SF6), air-blast, or minimal oil, vacuum GCBs offer several distinct advantages:
1. Superior Recovery Strength: Vacuum GCBs exhibit exceptional recovery strength, which eliminates the need for additional capacitors to mitigate the steepness of transient recovery voltage. This is a common requirement for most SF6-based generator circuit breakers, making vacuum GCBs a more straightforward and efficient solution.
2. High Mechanical and Electrical Durability: Vacuum GCBs demonstrate remarkable mechanical and electrical robustness, capable of performing a significantly higher number of switching operations at greater frequencies without the need for maintenance. This characteristic enhances their reliability and reduces operational costs over time.
3. Environmental Friendliness: Unlike SF6-based circuit breakers, vacuum GCBs do not utilize SF6, a potent greenhouse gas. This makes them a more environmentally friendly option, aligning with global efforts to reduce the carbon footprint of electrical infrastructure.
Vacuum GCBs are particularly well-suited for applications that require frequent switching and the interruption of low-frequency currents, such as those encountered in pumped storage power plants. These plants often involve cyclic operations, where the ability to perform repeated switching tasks efficiently and reliably is crucial. The robust performance and maintenance-free operation of vacuum GCBs make them an ideal choice for such demanding environments, ensuring consistent and safe operation of the power generation and distribution systems.
Technical Parameters
| MAIN TECHNICAL DATA | ||
| Data | Unit | Value |
| Rated Frequency | Hz | 50 |
| Rated Voltage | kV | 12 |
| Rated Short-duration Withstand Voltage(1min) | kV | 48/28in air |
| Rated Lightning Impulse Withstand Voltage | kV | 85/60 in air |
| Rated Current | A | 1250 |
| Circuit Resistance at the Lowest Rated Contact Force | μΩ | ≤15 |
| Rated Short-circuit Breaking Current | kA | 25 |
| Rated Short-circuit Breaking Current Breaking Times | Times | 50 |
| Rated Short-duration Withstand Current | kA | 25 |
| Rated Duration of Short-circuit | s | 4 |
| Rated Peak Withstand Current | kA | 63 |
| Rated Short-circuit Making Current | kA | 63 |
| Rated Operaing Sequence | O-0.3(0.5)s-CO-180s-CO | |
| Contact Stroke | mm | 9±1 |
| Contact Closing Force | N | 100±30 |
| Force Required to hold contacts open at full stroke | N | 160±40 |
| Average Opening Speed (first 75% stroke) | m/s | 1.0±0.2 |
| Average Closing Speed (last 30% stroke) | m/s | 0.6±0.2 |
| Rated Contact Force | N | 2000±200 |
| Contact Force at the Touch Point | N | 1400±150 |
| Contact Closing Bouncing Duration | ms | ≤2 |
| Contact Opening and Closing Non-simultaneity | ms | ≤2 |
| Contact Opening Rebound Amplitude | mm | ≤2 |
| Storage Life | Years | 20 |
| Mechanical Endurance | Times | 10000 |
| Contact Erosion Limit | mm | 3 |
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