真空有载开关

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(2). Arc voltage in vacuum is low 真空中的电弧电压低
Contact clearances only in several mm Metal vapour plasma of the vacuum arc highly conductive 触头间距仅几毫米 真空电弧几乎纯金属等离子 导电性好 Low arc voltage 低电弧电压
minimal energy conversion
minimal contact erosion reduced contact wear
能量转换低
触头损坏小 降低触头烧损
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(3). Elimination of the insulating medium as the arc quenching agent
绝缘介质免去了灭弧重担
elimination of by-products e.g. carbon when using transformer oil 消除油中的分解物(碳颗粒) on-line filter (Oil Filter Unit) not necessary 不需在线 easy disposal 简化换油
6.
Extraordinary fast dielectric recovery of up to 10 kV/µs
真空中超高速介电恢复达10 kV/µs
MR / EVA / Dr. Shen
18.04.2007
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(1). Vacuum interrupter is a hermetically sealed system 真空开源自文库管是一全封闭的系统
触头表面无杂质和污染 使用高导电材料 接触电阻小 并保持稳定 热耗低
high rate of recondensation of metal-vapor on contacts 大部分金属蒸汽在触头表面又重凝聚 significantly extends contact life 显著延长了触头寿命
•contact surfaces are free of impurities and pollution layer •Highly conductive materials are used •minimal contact resistance •constantly low contact resistance •Heat losses are therefore low
1. 2. 3. 4. 5. The vacuum interrupter is a hermetically sealed system 真空开关管是一全封闭的系统 The arc (drop) voltage in vacuum is considerably lower than in oil or SF6 真空中的电弧电压比油和SF6 中低 Elimination of the insulating medium as the arc quenching agent 绝缘介质免去了灭弧重担 No aging of the quenching medium 灭弧介质无老化现象 No interaction/oxidation during switching 开关中无交互或氧化
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(4). No aging of the quenching medium 灭弧介质无老化现象
getter effect of metal-vapor plasma with absorption of free gas molecules 金属蒸汽等离子吸收自由气体分子的获得效应
Switching performance 优异的开关性能 Contact lifespan 超长触头寿命 Physical dimension 不增大外形尺寸
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Highlight of technical features 技术特征
replaced by 替代
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Vacuum Technology in MR MR 真空技术
Over 20 years of experience with vacuum technology in OLTCs 拥有20多年在有载分接开关中采用真空技术的经验 Worldwide more than 40,000 vacuum interrupters in MR OLTCs in service 全球有4万多支真空开关管在MR有载分接开关中运行 Vacuum interrupters in state-of-the-art design and production specially for OLTC applications 专为有载分接开关的应用而特制的真空开关管具有最新的设计和工艺 High reliability with best operation records 优异的运行业绩证明高可靠性 High life span: maintenance-free for power transformers applications 超长的运行寿命实现在电力变压器中终身免维护 Sharing 75 years MR experience with OLTC manufacturing 分享MR 75年生产有载分接开关的经验
MR / EVA / Dr. Shen
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Principle structure of a vacuum interrupter 真空开关管的原理结构
MR / EVA / Dr. Shen
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Key Design-Conception 真空开关管的设计理念
最新的触头材料 真空炉中一次焊结工艺 X光检测 内压测量 高压老炼
•Joints made in this way are not subject to ageing deterioration 真空接缝几乎无老化
vacuum interrupters therefore remain tightly sealed throughout their working life 真空开关管在寿命期密封 there is no interaction with the surrounding medium, despite the arc 跟周边介质无交互 the switching characteristics do not depend on the surrounding medium 开关性能跟周边介质的状态无关
Technical Background of
Vacuum Switching Technology for OLTCs
真空有载分接开关的技术背景
MR / Dr. Shen 2007
Overview of contents 简介
1. Introduction of vacuum switching technology 2. Key design conception 3. Basic characteristics of vacuum interrupters 4. High performances of vacuum OLTCs 5. Summary of advantages 6. Performance verification 7. Why no significant overvoltage can be caused !
Maintenance-free operations up to 300,000 switching operations 操作30万次免维护
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Summary of advantages (2) 总结 (2)
Rate of contact wear for OLTC vacuum interrupters is more than one decade smaller compared to copper-tungsten 用于有载分接开关的真空开关管的触头烧损仅为钨铜触头的十分之一 Example for 1000 A shows only 3 % of copper-tungsten wear 比如1000A只有3%钨铜触头有烧损 Vacuum interrupters for OLTCs designed by MR reach 600,000 switching operations MR 真空开关管的电气寿命达 60 万次操作
Steady-state pressure in a vacuum interrupter less than 10-9 bar
真空开关管中稳态压力小于10-9巴 Gap dielectricly recovered very quickly short arcing duration 触头间介电恢复非常迅速 电弧导通时间短
Mechanical lifespan 高机械寿命
in transformer oil
适用变压器油 适用其他绝缘介质
other given insulating medium operating temperature range expected lifespan of the OLTC
适用变压器运行温度范围 超过有载分接开关的寿命期望
•the state-of-the-art contact materials •"one-shot brazing" technology in vacuum brazing furnace •X-ray detecting •inside pressure measuring •HV conditioning
Conventional technology Tungsten-copper arcing contacts in mineral transformer oil 传统开关技术 = 油中灭弧的钨铜触头 Vacuum Switching technology MR Vacuum interrupters 真空开关技术 = MR真空开关管
constant switching characteristics throughout the entire lifespan of the vacuum interrupters 在真空开关管寿命期开关性能稳定
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(5). No interaction/oxidation during switching 开关中无交互或氧化
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Summary of advantages (1) 总结 (1)
Environment independent switching condition of vacuum interrupters 真空开关管的开关性能跟周边环境无关
真空开关技术介绍 设计理念 真空开关管的基本特性 真空有载分接开关的优异性能 优势小结 性能的验证 为什么不会引起过电压!
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Innovative Vacuum Switching Technology in OLTCs 真空开关技术对有载分接开关的革新
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(6). Extraordinary fast dielectric recovery 介电恢复异常迅速
fast dielectric recovery of up to 10 kV/µs
介电恢复速度达10 kV/µs
Ensures short arcing times maximum of one half-cycle 保证电弧导通时间短 最长半个周期 in the case of large phase angles between current and voltage 既使当电流和电压间的相角很大时 high voltage steepness dU/dt after the current zero e.g. converter transformers 或者在电流过零时电压的上升陡度很大，如换流变