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采用4种不同纵磁触头结构的126kV单断口真空断路器温升性能对比研究
Comparison Study on Temperature-rise Performance of 126 kV Single-break Vacuum Circuit Breakers with 4 Types of AMF Contacts
【摘要】 为进一步提升126 kV单断口真空断路器额定通流能力,文中针对4种采用不同纵磁触头结构的126 kV真空断路器的温升特性通过仿真进行了对比研究。4种纵磁触头分别为2/3、3/4匝线圈型、马蹄铁型和开槽马蹄铁型纵磁触头。有限元仿真结果表明在通流3 150 A时4种触头的热态交流电阻分别为30.2、36.9、24.0、16.3μΩ。4种断路器整机的温度分布采用有限体积法计算得到,温升仿真模型由通流2 500 A下的实验结果验证。结果表明,仿真模型在灭弧室周围的5个测温点内计算误差小于10%,最大的计算误差由于未考虑外部接线的影响,出现在断路器端部,为36%。通过对4种纵磁触头在3 150 A下的温升特性进行仿真,发现开槽马蹄铁型纵磁触头在上述4种触头结构中具有最好的温升表现,并且其3 150 A温升特性符合国标要求,其中温升最高的测温点温升为66 K。
【Abstract】 For improving rated current flow capacity of 126 kV single-break vacuum circuit breaker(VCBs)further,the temperature rise feature of 126 kV vacuum circuit breaker adopting 4 kinds of different AMF contact structures is compared and studied in this paper.The 4 kinds of AMF contacts are 2/3 turn coil-type AMF contact,3/4 turn coiltype AMF contact,horseshoe-type AMF contact and slotted horseshoe-type AMF contact,respectively.The finite element simulation result shows that,in case of flowing current at 3 150 A,the hot state AC resistances for the 4 kinds of AMF contacts are 30.2,36.9,24.0 and 16.3μΩ,respectively.Temperature distribution of the 4 kinds of VCBs is obtained by employing finite volume method.Temperature-rise simulation models are verified by experimental results at flowing current at 2 500 A.It is shown by the result that the calculation errors of the simulation model within5 temperature measurement points around interrupter is less than 10%,the maximum calculation error of 36%is on the terminal of circuit breaker since the influence of external wiring is not considered.It is found through simulation of temperature rise feature of 4 kinds of AMF contacts at 3 150 A that the slotted horseshoe-type AMF contact has the best temperature-rise performance among above 4 kinds of contact structures and its temperature rise performance at nominal rated current of 3 150 A complies with China National Standard(GB)requirement,in which the temperature rise at the highest temperature measurement point is 66 K.
- 【文献出处】 高压电器 ,High Voltage Apparatus , 编辑部邮箱 ,2021年06期
- 【分类号】TM561.2;TM503.5
- 【被引频次】1
- 【下载频次】276