VD4M1206-25 中压真空断路器 消除灰尘和潮气对灭弧室的外绝缘能力的影响

产品细节：VD4M1206-25 中压真空断路器 消除灰尘和潮气对灭弧室的外绝缘能力的影响

新VD4真空断路器是ABB驰名的灭弧室和浇注极柱研发和制造技术,以及先进的操动机构研发、设计和生产技术的完美结合。
VD4中压真空断路器的灭弧室被整体浇注在环氧树脂中。整体浇注的极柱结构更坚固,可为真空灭弧室提供更加充分的保护,并可消除灰尘和潮气对灭弧室的外绝缘能力的影响。
灭弧室将开关的主触头永久密封在真空环境中,构成开断灭弧单元。在真空中开断电流
真空断路器不需要灭弧和绝缘的介质。实际上,灭弧室中不存在可被电离的物质。在任何情况下,当触头分离时,触头间的电弧通道仅仅由触头材料的金属蒸气构成。电弧只能由外部能量维持,当主回路电流在自然过零点时刻消失,电弧即不能维持。在此刻,急速下降的载流密度和快速凝聚的真空金属蒸气,使触头之间迅速恢复了绝缘。真空灭弧室因此恢复了绝缘能力以及耐受系统瞬态恢复电压的能力,最终将电弧熄灭。

特殊设计的触头几何形状和触头材质,以及很短的燃弧时间和极低的电弧电压，使触头烧蚀程度非常低,保证了灭弧室的长寿命。此外,真空还可以防止触头被氧化和污染。
EL型操动机构
现代真空灭弧室的触头所需分离速度低、行程小、质量轻,仅需要机构提供很少的操作功。这保证了操作系统的低磨损量,同时也意味着断路器仅需要很少的维护。VD4断路器使用了弹簧储能、自由脱扣的模块化机械操动机构。断路器的分合闸操作性能与具体操作者无关。此操动机构概念简单、使用方便,可以自由选配可简单快速安装的二次附件。朴素的设计思想带来了元器件的高可靠性。

VD4M1206-25

General Rule 4 Breaking Principle 6 Installation mode 6 Application field 6 Standards and certificates 6 Operating safety 7 Accessories 8 Operating mechanism 8 Technical document 10 Quality system 10 Environmental management system 10 Health and Safety management system 10
The new VD4 vacuum circuit breaker is the perfect combination of ABB’s renowned R&D and manufacturing technology of arc extinguishing chamber and pouring pole, and advanced operating mechanism R&D, design and production technology.
The quench chamber of the VD4 medium pressure vacuum circuit breaker is poured integral in epoxy resin. The overall pouring pole structure is stronger, which can provide more adequate protection for the vacuum arc extinguishing chamber, and can eliminate the influence of dust and moisture on the external insulation capacity of the arc extinguishing chamber.
The arc extinguishing chamber permanently seals the main contact of the switch in a vacuum environment to form an arc breaking unit. Break the current in a vacuum
Vacuum circuit breakers do not require arcing and insulating media. In fact, there is no ionized material in the chamber. In any case, when the contacts are separated, the arc passage between the contacts consists solely of the metallic vapor of the contact material. The arc can only be maintained by external energy. When the main loop current disappears at natural zero crossing, the arc cannot be maintained. At this point, the rapidly decreasing current carrier density and the rapidly condensing vacuum metal vapor quickly restore insulation between the contacts. The vacuum chamber thus restores the insulation capacity and the ability to withstand the system’s transient recovery voltage, eventually extinguishing the arc.

Specially designed contact geometry and contact material, as well as very short arc burning time and very low arc voltage, so that the contact ablative degree is very low, ensure the arc extinguishing chamber long life. In addition, the vacuum protects the contacts from oxidation and contamination.
EL type operating mechanism
The contact of modern vacuum arc extinguishing chamber requires low separation speed, small stroke and light weight, and only requires the mechanism to provide little operating work. This ensures low wear on the operating system and means that the circuit breaker requires minimal maintenance. The VD4 circuit breaker uses a spring-loaded, free trip modular mechanical operating mechanism. The operation performance of circuit breaker has nothing to do with the specific operator. The operating mechanism is simple in concept and easy to use. It can be freely selected with secondary accessories that can be easily and quickly installed. The simple design idea brings high reliability of components.

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