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CKVB-12 Indoor Vacuum Circuit Breaker
- CKVB-12 indoor vacuum circuit breaker is suitable for indoor switchgear of three-phase AC 50Hz and rated voltage 12kV power system. It is suitable for power plants, substations and distribution rooms in power systems, especially in places where frequency operation at rated operating current or multiple switching and closing of short-circuit currents is required.
►Overview
CKVB-12 indoor vacuum circuit breaker is suitable for indoor switchgear of three-phase AC 50Hz and rated voltage 12kV power system. It is suitable for power plants, substations and distribution rooms in power systems, especially in places where frequency operation at rated operating current or multiple switching and closing of short-circuit currents is required. CKVB series indoor high-voltage vacuum circuit breakers are divided into side-mounted type, front-mounted type and withdrawable type according to the installation method, and insulated cylinder and solid-insulation-embedded pole type according to the structural form. The maximum rated current is up to 4000A.
The circuit breaker meets the requirements of GB1984-2014 "High Voltage AC Circuit Breaker", JB/T3855-2008 "3.6-40.5kV Indoor AC High Voltage Vacuum Circuit Breaker", DL/T403-2017 "12kV-40.5kV High Voltage Vacuum Circuit Breaker Ordering Technical Conditions" and IEC62271-100.
►Product features
1.Vacuum arc extinguishing：The novel longitudinal magnetic field vacuum interrupter has better arc extinguishing performance and lower operating overvoltage.
2.Superior performance：The conductive part of the pole and the ceramic vacuum arc extinguishing chamber are both enclosed in an epoxy resin sleeve; Prevent damage to the vacuum arc extinguishing chamber, ensuring high resistance in humid, hot, and polluted environments; Important functional components such as energy storage, retention, and release are all treated with heart strengthening and surface treatment; The mechanism components are more corrosion-resistant, wear-resistant, and the mechanism action is more reliable.
3.Flexible structure：Modular spring switching mechanism, more reliable opening and closing operation, and more convenient maintenance.
4.Easy operation：Operation mode: manual or motorized. Motorized operating power supply: AC/DC universal, 220 or 110V. The maximum number of optional devices is: two overcurrent trip coil+1 voltage loss trip coil or 3 overcurrent trip coil + 1 locking.
5.Stable and reliable：The optimization design of optional devices such as anti-triping and locking, overcurrent tripping, and voltage loss tripping, as well as the secondary circuit, provides strong guarantees for the reliable and safe operation of circuit breakers, and also provides users with more choices and interfaces in the design of protection and intelligent control.
6.Good suitability：Excellent performance, stable operation, long service life, minimal maintenance, no explosion hazard, no pollution, low operating noise.
►Technical parameter
Main technical parameters of circuit breakers
| Specifications | Unit | Data | ||||
| Rated voltage | kV | 12 | ||||
| Rated lightning impulse withstand voltage (peak) | kV | 75/85 | ||||
| Rated power frequency withstand voltage（1min） | kV | 42/48 | ||||
| Rated frequency | Hz | 50 | ||||
| Rated short-circuit breaking current | kA | 20、25 | 31.5 | 40 | ||
| Rated current | A | 630 | 1250 | 1600 | 1250 | 1600 |
| 1250 | 2000 | 2500 | 2000 | 2500 | ||
| 3150 | 3150 | 4000 | ||||
| Rated short-time withstand current | kA | 20、25 | 31.5 | 40 | ||
| Rated peak withstand current | kA | 50、63 | 80 | 100 | ||
| Rated short-circuit making current (peak) | kA | 50、63 | 80 | 100 | ||
| Secondary circuit power frequency withstand voltage (min) | V | 2000 | ||||
| Rated operating sequence | / | 0-0.3s-C0-180s-C0 | ||||
| Rated short-circuit duration | S | 4 | ||||
| Rated single/back-to-back capacitor bank breaking current |
A | 630/400 | 800/400 | |||
| Rated capacitor bank making inrush current | kA | 12.5(frequency less than 1000Hz) | ||||
| Mechanical endurance | Cycle | 10000 | ||||
| Rated number of short-circuit current interruptions | Cycle | 30 | 20 | |||
| Accumulated thickness of wear allowed for dynamic and static contacts | mm | 3 | ||||
| Rated closing and opening operating voltage | V | AC220/110DC220/110 | ||||
| Contact opening distance, overtravel | / | Opening distance 10±1; Overtravel 3±1 | ||||
| At rated operating voltage: closing and opening time | / | Closing ≦70; Opening ≦50 | ||||
| Contact closing bounce time | ms | 2 | 3 | |||
| Three phase closing and opening synchronization | / | 2 | ||||
| Average opening speed | m/s | 0.9~1.3 | ||||
| Average closing speed | m/s | 0.4~0.8 | ||||
| Main circuit resistance | μΩ | 630A:50 1250A:45 1600, 2000A:40 Above 2500A:30 | ||||
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