Indoor AC High Voltage Vacuum Circuit Breaker
Introduction: AC High Voltage Vacuum Circuit BreakerMZZ7-24 Indoor AC High Voltage Vacuum Circuit Breaker is the latest series generation of 24kV vacuum circuit breaker developed by our company in reference to domestic and foreign advanced technology. The chief design idea is that the main circuit adopts solid closed insulation performance and improves design actuator to make the insulation performance of circuit breaker stable and improve its mechanical reliability.
Thus, free of maintenance and longer mechanical life span as well as electric life are achieved. No explosion hazard or pollution. It is applied to the protection and control for electrical equipments of single busbar system in industrial and mining enterprises, power plants as well as substations. It also can be used in capacitor and many special occasions.
This product meets the national standards GB1984-2003"AC High Voltage Circuit Breaker" , IE62271-100"AC High Voltage Circuit Breaker" . It also meets DL/T403"Order Technical Conditions of 10~35KV Indoor AC High Voltage Vacuum Circuit Breaker" .
Environmental Conditions - AC High Voltage Vacuum Circuit Breaker
1. Environmental temperature: maximum temperature +40°C, minimum temperature -15°C (transportation storage at -30°C is allowed)
2. Environmental humidity:
Daily average relative humidity: ≤95%
monthly relative humidity: ≤90%
daily saturated evaporation pressure: ≤2.2×KPa
monthly saturated evaporation pressure:: 1.8×KPa
3. Altitude: lower than 1000m
Model Meaning
Main electrical parameters
1. MZZ7-24 main electrical parameters
| Name | Unit | Data | |||
| Rated voltage | Kv | 24 | |||
| Rated frequency | HZ | 50/60 | |||
| Rated insulation level | 1min working frequency voltage tolerance | KV | 60 | ||
| Rated lightening impact voltage tolerance | Hz | 125 | |||
| Rated current | A | 1250-3150 | |||
| Rated short circuit current tolerance (4S) | KA | 20 | 25 | 31.5 | |
| Rated peak value current tolerance | KA | 50 | 63 | 80 | |
| Rated short circuit breaking current | KA | 20 | 25 | 31.5 | |
| Rated closed current | KA | 50 | 63 | 80 | |
| Rated times of short circuit breaking current | Times | 30 | |||
| Rated short circuit duration time | Second | 4 | |||
| Secondary circuit working frequency voltage tolerance(1min) | V | 2000 | |||
| Rated capacitors breaking current | A | 400/630 | |||
| Rated operation order | O-0.3s-CO-180s-CO | ||||
| Mechanical life span | Times | 2000(Permanent magnetic body is 60000 times) | |||
2, MZZ7-24 mechanical parameters
| Name | Unit | Data | |
| Contact open size | Mm | 14±1 | |
| Excess travel | Mm | 3.5±1 | |
| Contact bouncing time of closing switch | Ms | ≤2 | |
| Different stages of three-phase open/close the switch | Ms | ≤2 | |
| Average Switch opening speed | Ms | 1.0±0.2 | |
| Average Switch closing speed | M/s | 1.3±0.2 | |
| Switch opening time | Ms | 35-70 | |
| Switch closing time | Ms | 20-50 | |
| Main circuit resistance | μΩ | 630A 1250A 1600 2000A 2500 3150A |
≤50μΩ ≤45μΩ ≤35μΩ ≤35μΩ ≤30μΩ ≤25μΩ |
| Rated power of electrical energy storage device | W | 80 | |
| Energy storage time | S | <10 | |
MZZ7-24 Indoor AC High Voltage Vacuum Circuit BreakerBack
Complete set switchgear-Power Control System
