Overview
The VHM-12GD series indoor high-voltage three-position vacuum circuit breaker offers excellent electrical and mechanical performance, with a reliable and stable mechanism and long service life. The main circuit adopts an encapsulated pole, improving the environmental adaptability and insulation reliability of the breaker; reliable mechanical and electronic performance, together with extended mechanical and electronic life, make the maintenance-free breaker possible. It is used in 3.6-12kV power systems as a protection and control unit for grid equipment and industrial mine power designs, suitable for various load types and for frequent operation and multiple short-circuit-current interruptions. The product is equipped with complete mechanical and electrical interlocks, providing extremely high operational stability and reliability, ensuring the safety of operators and equipment and guaranteeing electrical safety. It is a high-performance, compact high-voltage electrical product.
Ordering Information
For the VHM-12GD three-position vacuum circuit breaker, the following shall be specified when ordering: circuit breaker model, name, configuration and order quantity; rated voltage, rated current and rated breaking current of the breaker.
If the user has other special requirements, they may be stated in the technical agreement at the time of ordering.
Outline and Mounting Dimensions
Technical Parameters
The main technical parameters of the VHM-12GD vacuum circuit breaker are listed in the table below. The VHM-12GD three-position vacuum circuit breaker is rated 12 kV with rated currents of 630 A and 1250 A, rated short-circuit breaking currents of 20/25/31.5 kA, rated peak withstand currents of 50/63/80 kA and a 1 min power-frequency withstand voltage of 42 kV phase-to-phase (48 kV across the open gap).
| Item | Unit | Parameter | ||
|---|---|---|---|---|
| Rated voltage | kv | 12 | ||
| 1 min rated short-time power-frequency withstand voltage: phase-to-phase/open | 42/48 | |||
| Rated lightning impulse withstand voltage (peak): phase-to-phase/open | 75/85 | |||
| Secondary-circuit power-frequency withstand voltage (1 min) | 2000 | |||
| Rated frequency | Hz | 50 | ||
| Rated current | A | 630 1250 | ||
| Rated short-circuit breaking current | kA | 20 | 25 | 31.5 |
| Rated peak withstand current | kA | 50 | 63 | 80 |
| Rated short-circuit making current | kA | 50 | 63 | 80 |
| Rated short-time withstand current (4s) | kA | 20 | 25 | 31.5 |
| Rated short-circuit duration | 4 | |||
| Rated single/back-to-back capacitor-bank breaking current | A | 630/400 | ||
| Rated capacitor-bank making inrush current | kA | 12.5 (frequency not exceeding 1000Hz) | ||
| Number of rated short-circuit breaking operations | times | 30 | ||
| Mechanical endurance (disconnector/breaker/earthing switch) | 3000/10000/3000 | |||
| Allowable cumulative contact wear thickness | mm | 3 | ||
| Rated closing operating voltage | ||||
| Rated opening operating voltage | AC24/48/110/220DC24/48/110/220 | |||
| Rated voltage of energy-storage motor | AC24/48/110/220DC24/48/110/220 | |||
| Rated power of energy-storage motor | W | 70 | ||
| Energy-storage time | ≤15 | |||
| Contact gap | 9±1 | |||
| Over-travel | mm | 3.5±1 | ||
| Contact closing bounce time | ≤2 | |||
| Three-phase open/close non-synchronism | ≤2 | |||
| Opening time (at rated voltage) | ms | ≤40 | ||
| Closing time (at rated voltage) | ≤60 | |||
| Average opening speed (contact just opens ~6mm) | 0.9~1.3 | |||
| Average closing speed (6mm ~ contact just closes) | m/s | 0.5~1.1 | ||
| Contact opening rebound amplitude | mm | ≤2 | ||
| Contact closing force | N | 2400±200(20-25kA)3100+200(31.5kA) | ||
| Rated operating sequence | O-0.3s-CO-180s-CO | |||
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