Overcoming The Challenges Of High-Current Self-Cooling And High DC Component: XDTZ Successfully Develops A Domestically Produced Generator Circuit Breaker To Replace Siemens's

Recently, Shaanxi West Power Tongzhong Electrical Co., Ltd.. announced the successful development of its independently developed generator outlet vacuum circuit breaker. This product, when installed independently and naturally cooled, has a rated current of 5000A and a rated breaking current DC component of ≥75%. Its core performance fully matches and even surpasses that of Siemens' flagship 3AH3 series model, officially declaring my country's achievement of independent substitution in the field of core protection switches for generators.

For a long time, the market for power plant outlet circuit breakers, as core equipment ensuring the safe grid connection of generator sets, has been dominated by imported brands, represented by the Siemens 3AH3 series. Especially for small and medium-sized generator sets of 10MW to 80MW, due to the extremely slow decay of the short-circuit current DC component and the large rated current, ordinary distribution circuit breakers simply cannot meet the stringent IEEE C37.013 standard.

The VTZ-15/T5000-63 indoor high-voltage generator circuit breaker specifically targets this critical technological bottleneck, achieving performance leadership in three key dimensions: Stronger Heat Dissipation, Self-Cooling for 5000A Current Flow: Unlike similar Siemens models that only reach 3150A under natural cooling, this model, through optimized low-resistance main circuit design and heat dissipation structure, achieves a rated current of 5000A under independent installation and complete natural air cooling. This not only eliminates the additional power consumption and failure risks of forced air cooling systems but also significantly reduces the complexity and cost of daily operation and maintenance in power plants.

During a generator short circuit, the large DC component can cause the current to not pass through the zero point for an extended period, easily leading to interruption failure. This product's rated breaking current DC component capability exceeds 75%, and can supplement the rated short-circuit breaking current, resulting in a breaking capacity of 63kA. This can easily handle the extreme impact of generator reverse current, ensuring precise and reliable operation of the arc-extinguishing chamber every time.

More Stable Arc Extinguishing, Solving the "No Current Zero Point" Problem: When a generator is short-circuited, the large DC component can cause the current to not pass through the zero point for an extended period, easily leading to interruption failure. Superior Insulation, Continuing the Classic Design while Independently Evolving.

Simultaneously, the R&D team has innovatively introduced high-strength insulation components with elliptical cross-sections and added stress-grading rings between the insulator and support components, effectively resolving the hidden danger of uneven partial discharge under high electric field strength. Combined with a fixed installation structure that fully meets air insulation distance requirements, the overall insulation reliability of the unit has reached international first-class standards.

Chief Engineer Wang stated, "The successful development of this product means that domestic owners of small and medium-sized generator sets now have a more cost-effective and timely service option in addition to imported brands. We have not only surpassed imported brands in rated current capacity but also mastered the core technology for high DC component interruption."

Currently, the product has been delivered to overseas customers and will be operating in their projects. Industry experts point out that with the increase in the localization rate of such high-end switchgear, the construction cycle of power plants and the cost of spare parts are expected to be significantly reduced, providing solid support for the independent controllability of my country's new power system. 

For more information about ,VTZ-15/T5000-63 indoor high-voltage generator circuit breaker,pls contact us: 

Shaanxi West Power Tongzhong Electrical Co., Ltd.
Contact: Ms.Grace Liu (International Sales Manager)

Email:xdtz04@westpowerelectric.com 

Mobile: +86 18091765882(WhatsApp/Wechat/facebook/telegram)