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Unique and Proven Embedded Pole Technology

独特、可靠的固封极柱技术

VB series MV embedded pole vacuum circuit breaker uses the latest and mature technology of
Automatic Pressure Gelatin (APG) to embed the vacuum interrupter and connection terminals
within epoxy resin. The vacuum interrupter is cast in the epoxy resin, without screw fixation
which can cause the concentrated harsh electrical field and result in decrease of the electrical
insulation strength of the pole. Thanks to the embedded pole technology, the assembly of the
pole is simplified, and the assembly accuracy as well as quality of the embedded pole is easily
to be controlled by the state of the art production process. The embedded pole technology will
also improve the environmental resistant capability of the breaker, as the primary circuit of the
breaker is completely embedded inside the epoxy resin, the risk of insulation fault caused by
adverse operating environment such as dust, humidity, vermin, polluted ambient and high
altitude operating site are eliminated thoroughly.

VB 系列 MV 固封极柱真空断路器使用自动压力凝胶（APG）的最新成熟技术，将真空灭弧室和连接端子浇铸在环氧树脂中。真空
灭弧室采用环氧树脂浇铸而成，没有会引起集中的电场集中，导致绝缘强度降低的螺钉固定。得益于固封极柱技术，极柱的组装得
以简化，并且固封极柱的组装精度和质量易于通过最新的生产工艺进行控制。固封极柱技术还将提高断路器的耐环境性能，因为断
路器的一次电路完全股份在环氧树脂内部，因恶劣的操作环境（例如灰尘，湿气，害虫，污染的环境）和高海拔应用而导致绝缘故

障的风险被彻底消除。

The key know how of the embedded pole technology is the buffering layer between epoxy resin and ceramic housing of vacuum
interrupter, where the material and processing of the buffering layer is essential to ensure the integrity of epoxy resin of the
embedded pole provide adequate adhesion between each other in any circumstance. LSR (Liquid Silicon Rubber) buffering layer
and double APG (Auto Pressure Gelatin) Process adopted in the producing of the embedded pole thoroughly eliminated the
Cracking of the epoxy resin caused by the large difference of the thermal expansion coefficient between epoxy resin and ceramic
in case of rapid changing of the ambient temperature. APG process for LSR buffering layer ensures that there will not be any air
gap or bubble between the buffering layer and ceramic housing, hence, the high electrical insulation strength of the embedded
pole of SecoVac series MV embedded pole vacuum circuit breaker is guaranteed.The partial discharge value of embedded pole
manufactured by LSR (Liquid Silicon Rubber) buffering layer and double APG (Auto pressure gelatin) process is below 5pc with
an applied testing voltage of 1.2Um.

固封极柱技术的关键知识是环氧树脂和真空灭弧室的陶瓷外壳之间的缓冲层，缓冲层的材料和工艺对于确保固封极柱的环氧树脂的
完整性，在每一点都具有足够的附着力至关重要其他任何情况下。在生产固封极柱时采用 LSR（液态硅橡胶）缓冲层和双重 APG

（自动压力明胶）工艺，彻底消除了由于环氧树脂和陶瓷之间的热膨胀系数差异大而引起的在环境温度快速变化的情况下环氧树脂
开裂。 LSR 缓冲层的 APG 工艺可确保缓冲层与陶瓷外壳之间不存在任何气隙或气泡，因此，可确保 VB 系列断路器固封极柱具有
较高的电绝缘强度。LSR（液态硅橡胶）缓冲层和双重 APG（自动压力明胶）工艺制造的嵌入式电极的局部放电值在施加的测试
电压为 1.2Um 时低于 5pc。

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