Product Introduction
Kechang (Kechang) Fixed pole vacuum circuit breaker (VCB) is a medium voltage switchgear used in substations, industrial power systems and power distribution equipment. The product abandons the traditional design of the vacuum arc extinguishing chamber and the exposed conductive components, and casts and encapsulates the core components in an epoxy resin insulated pole column. This design not only gives the circuit breaker a simple and compact structure, but more importantly, it can effectively protect the insulation system from dust, moisture and other pollutants. The circuit breaker is mainly used to cut off the normal load current and cut off the fault current in the event of a short circuit.In addition, it can be installed in various types of medium voltage switchgear according to the customer's cabinet design requirements.
Product Feature
1. APG epoxy resin fixed pole column
The fixed pole column is manufactured by APG (automatic pressure gel) process.During the molding process, the vacuum arc extinguishing chamber and related conductive components are completely coated with epoxy resin to form an integrated insulating unit. For equipment installed in environments that are difficult to completely avoid dust and humidity (such as factories or substations), this structure has significant practical advantages: fewer insulating surfaces need to be cleaned, and the possibility of condensation affecting the main insulation is greatly reduced. The selected epoxy resin material has excellent mechanical strength, heat resistance and long-term stability. The final product is a solid-state insulated vacuum circuit breaker, which does not need to rely on oil or SF6 gas for arc extinguishing.
2. Compact structure
In the renovation projects of old substations, space is often a limiting factor.The embedded pole design helps to reduce the interphase distance, thereby maintaining the compactness of the circuit breaker assembly. This feature makes the arrangement of vacuum circuit breakers in the medium voltage switchgear more flexible and convenient, especially for occasions where the existing power distribution room cannot be expanded.According to the layout requirements of the switchgear, two versions are available: fixed type and hand-car type (retractable type). The circuit breaker body and operating mechanism have been assembled before leaving the factory. The on-site installation work mainly involves mechanical fixation, main circuit connection and control line wiring, without the need for complex circuit breaker body assembly.
3. Vacuum arc extinguishing and fault protection
The vacuum circuit breaker uses a vacuum arc extinguishing chamber for arc extinguishing.When a fault occurs, the contacts in the arc extinguishing chamber are separated, thereby quickly cutting off the current. Vacuum technology also avoids the use of insulating oil and SF6 gas during normal operation. For different power distribution systems, Kechang can provide configuration solutions with short-circuit switching currents up to 40kA. The rated current, operating mechanism and protection components can be selected according to the switchgear and system requirements.
Less daily maintenance workload
There is no need to check or replace the insulating oil, and the vacuum arc extinguishing chamber is in a sealed state during normal operation. The solid-sealed insulation structure also reduces the number of exposed conductive and insulating parts. For users of substations or distribution systems with limited maintenance personnel, this simplifies daily inspections.In addition, according to needs, the circuit breaker can also be equipped with temperature monitoring and intelligent control functions.
Product Specifications
| Number | Parameter name | Unit | Technical Parameters | |||
| 1 | Rated voltage | kV | 12 | |||
| 2 | Rated short-time frequency withstand voltage (1 min) | kV | 42 | |||
| 3 | Rated lightning impulse withstand voltage (peak) | kV | 75 | |||
| 4 | Rated frequency | Hz | 50 | |||
| 5 | Rated current | A | 630/1250/1600/2000/2500/3150/4000 | |||
| 6 | Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 |
| 7 | Rated short-time withstand current | kA | 20 | 25 | 31.5 | 40 |
| 8 | Rated short circuit duration | S | 4 | |||
| 9 | Rated short-circuit closing current | kA | 50 | 63 | 80 | 100 |
| 10 | Rated peak withstand current | kA | 50 | 63 | 80 | 100 |
| 11 | Number of rated short-circuit current starts | times | 30 | 30 | 30 | 20 |
| 12 | Rated individual capacitor bank opening current | A | ≤630 | |||
| 13 | Rated back-to-back capacitor bank opening current | A | ≤400 | |||
| 14 | Rated capacitor bank closing inrush current | kA | 12.5(frequency≤1000Hz) | |||
| 15 | Closing time | ms | ≤80 | |||
| 16 | Split time | ms | Maximum Voltage | ≤40 | ||
| ms | Rated Voltage | ≤50 | ||||
| ms | Minimum Voltage | ≤60 | ||||
| 17 | Time of ignition | ms | ≤15 | |||
| 18 | Mechanical life (M2) | times | 30000 | |||
| 19 | Allowable cumulative thickness of dynamic and static contact wear | mm | 3 | |||
| 20 | Rated closing operating voltage | V | AC/DC 220, AC/DC 110 | |||
| 21 | Rated breaking operating voltage | V | AC/DC 220, AC/DC 110 | |||
| 22 | Rated operating voltage of energy storage motor | V | AC/DC 220, AC/DC 110 | |||
| 23 | Rated power of energy storage motor | W | 80 (40KA Motor speed 100W) | |||
| 24 | Energy storage time | s | ≤15 | |||
| 25 | Contact opening distance | mm | 9±1 | |||
| 26 | Over traveling distance | mm | 3.5±0.5 | |||
| 27 | Contact closing bounce time | ms | ≤2 | |||
| 28 | Three-phase switching and closing non-synchronous | ms | ≤2 | |||
| 29 | Contact splitting rebound amplitude | mm | ≤3 | |||
| 30 | Contact closing contact pressure | kA | 20 | 25 | 31.5 | 40 |
| N±8% | 2200 | 2500 | 3100 | 4750 | ||
| 31 | Average breaking speed (contacts separated by 6mm) | m/s | 1.1±0.2 | |||
| 32 | Average closing speed (6mm contact closure) | m/s | 0.6±0.2 | |||
| 33 | Dominant electric circuit resistance | A | 630 | 1250 | 1600-2000 | ≥2500 |
| 34 | μΩ | ≤50 | ≤45 | ≤35 | ≤25 | |
| Rated operating sequence (1) 20~31.5KA | Minutes - 0.3s - combined minutes - 180s - combined minutes | |||||
| 35 | Rated sequence of operation (2) 40KA | Minutes - 0.3s - combined minutes - 180s - combined minutes | ||||
| Secondary circuit frequency withstand voltage (1min) | V | 2000 | ||||
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