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22KV Medium Voltage Vacuum Circuit Breaker with Disconnector
This 22kV Medium Voltage Vacuum Circuit Breaker with Disconnector is a reliable solution designed by Cotenele, a professional China manufacturer, specifically for modern power distribution systems. Vacuum circuit breakers and disconnectors each have different functions; their combined use creates a powerful synergistic effect, playing a crucial role in ensuring the stable and efficient operation of the power grid.
The stability of a switchgear depends on a robust protection and switching system. Its core components, for example 22KV Medium Voltage Vacuum Circuit Breaker With Disconnector, are the first protective barrier against electrical faults, which can prevent large-scale failures and high shutdown costs. The design purpose of vacuum circuit breakers is to cut off fault currents, while isolation switches provide a visible way to isolate circuits for maintenance. They have both of the safety and reliability of switchgear in the power distribution network, meet the requirements of modern electrical design, and emphasize environmental friendliness, durability, and low maintenance.
Product Model
| KD | V | 24 | D | 630 | 20 |
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Company code |
Vacuum circuit breaker Operating mechnaism |
Rated voltage |
Grounding type |
Rated current |
Rated Short-time withstand current |
What is a vacuum circuit breaker(VCB)?
A Vacuum Circuit Breaker is an core component in the medium-voltage switchgear, which interrupts current utilize a vacuum as the arc-extinguishing medium. When the contacts of the vacuum circuit breaker separate under a fault, an arc is formed from ionized metal vapor. In the vacuum space, this arc is extinguished almost instantly as the metal vapors condense back onto the contacts, preventing re-ignition..
Key components:
Vacuum interrupter: a sealed vacuum cylindrical container containing fixed contacts and movable contacts.
Operation mechanism: Implement the function of closing and disconnecting contacts. Types include manual and electric types.
Actuators and connecting rods: transmit the motion generated by the operating mechanism of the vacuum circuit breaker to the contacts.
Advantages:
Efficient arc extinguishing function: Quickly achieve fault isolation with extremely low energy consumption.
Themaintenance cost is very low: The vacuum circuit breaker is no need to add any insulation medium or gas.
Environmental Friendly: The vacuum circuit breaker is different with sulfur hexafluoride circuit breakers, the vacuum circuit breakers do not produce any harmful gases during operation, making them more environmentally friendly.
High reliability: The operation life of the circuit breaker is long and suitable for frequent operation
What is an switch disconnector?
A switch disconnector is a electrical switch mounted in the medium-voltage switchgear, in the closed position, carries the normal load current. This isolation switch can also make and break the rated load current. Under abnormal conditions, such as a short circuit, it can carry this fault current for a specified short duration, but it is not designed to interrupt it. This switch disconnector's primary safety function is to provide a reliable means of isolation, which ensures a circuit is completely de-energized for maintenance or repair.
Key features:
Load Breaking: The switch disconnector can provide normal load currents interuptting capacity.
Visible Isolation: The isolation switch can provides a visible gap to confirm circuit de-energization.
Withstand Capacity: The isolator switch can withstand short-circuit currents until a series protection device (like a VCB) clears the fault.
Configurations: The disconnector have two configuration for air-insulated or gas-insulated designs, often combinable with fuses for transformer protection.
Why choose 22KV Medium Voltage Vacuum Circuit Breaker With Disconnector?
The combination of a vacuum circuit breaker + disconnector is a standard configuration in medium-voltage systems (up to 40.5kV).
Core Benefits
Complete protection + isolation in one system
Improved operational safety
Reduced maintenance downtime
Compact and efficient design
The applications scope of VCB + Disconnector Combinations:
The Combination of a VCB with a disconnector is a standard configuration in medium-voltage ring main unit (up to 40.5kV), whitch can provide both protection and assured isolation. This combination is critical in:
Power Generation Plants:The combination can protect generators and transformers when the device occur faults, this can ensure uninterrupted electricity production.
Electrical Substations: The combination of the vacuum circuit breaker and switch disconnector protect switchgears and transformers, the VCB clear faults and the disconnector isolate sections for maintenance.
Industrial Facilities: The combination of the vacuum circuit breaker and isolator switch Control and protect motors, conveyors, and heavy machinery in manufacturing plants, steel mills, and refineries.
Renewable Energy Systems: Manage power fluctuations and protect infrastructure in wind and solar power plants.
Renewable energy system: The 22KV Medium Voltage Vacuum Circuit Breaker With Disconnector can cope with power fluctuations and protect the infrastructure of wind and solar power plants.
Railway system: The combination can protect the train power supply system and ensure the safety of passengers and trains.
Compact Substation (CSS): In the secondary distribution network, these combinations provide reliable switching and protection functions in a small space.
Technical Parameters
| SN | Content | Unit |
Technical Porameter |
| 1 | Main Circuit Resistance | uΩ | ≤60 |
| 2 | Over Travel | mm | 2-3 |
| 3 | Clearance Between Open Contacts | mm | 11-12 |
| 4 | Contact Bounce Duration at Closing Operation | ms | ≤2 |
| 5 | Average Opening Speed | m/s | 1-1.6 |
| 6 | Average Closing Speed | m/s | 0.6-1.1 |
| 7 | Out of Simultaneity of Contact Opening | ms | ≤2 |
| 8 | Out of Simultaneity of Contact Closing | ms | ≤2 |
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FAQ
1.What makes the 22kV Medium Voltage Vacuum Circuit Breaker with Disconnector unique in medium-voltage systems?
A: The 22kV Medium Voltage Vacuum Circuit Breaker with Disconnector combines rapid fault interruption and safe visible isolation in one device. Its vacuum interrupter ensures fast arc extinguishing, while the disconnector provides reliable maintenance isolation. This combination delivers high reliability, low maintenance, and environmental safety, making it ideal for power plants, substations, industrial facilities, and renewable energy systems.
2. Why are operating mechanisms so critical to circuit breaker reliability?
Most faults in circuit breakers are related to the operating mechanism. This complex system consisting of springs, locks, and motors is responsible for storing and releasing the energy required to open and close contacts. If the institution malfunctions, the circuit breaker will not function properly, thereby damaging the integrity of the entire protection system.
3. How does a spring-operated mechanism in a VCB work?
The electric motor charges a "closing spring" mechanically, which is secured by a locking buckle. When a closing signal is received, the lock buckle is released, and the energy of the spring will cause the contact to close. This action simultaneously charges the 'trip spring'. Then, the motor will charge the closing spring promtly, and preparing for the next operation.
4. What the "SF₆-free" for a switch disconnector refer to?
Traditional gas insulated switchgear typically uses sulfur hexafluoride (SF ₆) gas. However, KDSVM-12 isolation switches or some other Cotenle products no any sulfur hexafluoride gas use vacuum or clean air insulation to achieve high performance while avoiding the negative impact of sulfur hexafluoride on the environment.
5. What factors we usually considered when we select a VCB?
The main factors are:
The Rated Voltages and currents: The rated voltages and the currents must match the rated load and peak load requirements of the system.
Interrupting Capacity: Must be capable of safely clearing the maximum possible fault current.
Operating Mechanism: Choose between spring, magnetic, or hydraulic based on the required operation frequency and response time.
Mechanical and Electrical Endurance: A higher number of rated operational cycles indicates a longer service life and lower maintenance needs.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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