摘要
为研究10kV配电变压器中,在不改变原矿物绝缘油变压器结构设计和制造工艺条件下,直接用植物绝缘油替换矿物绝缘油后,对变压器温升特性影响。特制造两台结构设计和加工工艺完全相同的S11-M-315kVA/10kV配电变压器,分别填充克拉玛依25号矿物绝缘油和FR3植物绝缘油,通过AnsysCFX仿真软件对两台配电变压器进行油流和温度的模拟仿真,得到两台变压器在模拟温升实验中的差异,并通过对两台变压器实际现场温升试验,分析比对植物绝缘油直接替换矿物绝缘油后对变压器温升性能的实际影响,并通过植物绝缘油的理化性能对实验数据进行分析。研究表明,对于10kV配电变压器,在不改变原矿物绝缘油变压器设计结构与制造工艺条件下,用FR3植物绝缘油直接替换25号矿物绝缘油,植物绝缘油变压器整体温升均比矿物绝缘油变压器高约3~6K,但仍满足GB1094.2—2013《电力变压器第2部分:液浸式变压器的温升》标准对温升限值要求;在同等温升条件下,植物绝缘油在变压器中的油流速度明显比矿物绝缘油慢,在本事例中仅为矿物绝油流速的1/2,这是导致其温升偏高的原因。在变压器油流速度和温度热点分布方面,植物绝缘油变压器与矿物绝缘油具有相同趋势,两台变压器温度最高点均集中在中间绕组的上部,且位于外侧的高压绕组比位于内侧的低压绕组温度高;两台变压器油流速度最大值均出现在上部绕组之间。现场温升试验和模拟仿真均相互验证了以上结论。最后,根据研究结论,分别提出降低植物绝缘油配电变压器温升和提高温升限值的方法。
In order to study the 10 kV distribution transformer,the effect of the vegetable insulating oil on the temperature rise characteristics of the transformer was replaced by the vegetable insulating oil without changing the structural design and manufacturing process of the original mineral insulating oil transformer.The S11-M-315 kVA/10 kV distribution transformer,which is exactly the same in the design and processing process,is used to fill the Karamay No.25 mineral insulating oil and FR3 vegetable insulating oil respectively.The two transformers are oiled by Ansys CFX simulation software flow and temperature simulation of the two transformers in the simulation of the temperature rise in the experimental differences,and through the actual temperature of two transformers on-site test,compared with the vegetable insulation oil directly replace the mineral insulation oil after the transformer temperature rise performance.And the physical and chemical properties of vegetable insulating oil are used to analyze the ex-perimental data.The results show that,for the 10 kV distribution transformer,without changing the original mineral insulating oil transformer design structure and manufacturing process conditions,with FR3 vegetable insulating oil directly replace No.25 mineral insulating oil,vegetable insulation oil transformer overall temperature rise than mineral insulating oil.The transformer is about 3~6 K,but still satisfy the GB 1094.2-2013“power transformer part 2:liquid immersion transformer temperature rise”standard temperature limit requirements;in the same temperature conditions,the vegetable insulation oil in the transformer,the oil flow rate is significantly slower than mineral insulating oil,in this case only 1/2 of the mineral oil flow rate,which is the reason for its high temperature rise.In the transformer oil flow velocity and temperature hot spot distribution,the vegetable insulation oil transformer and mineral insulating oil has the same trend,the two transformer temperature points are concentrated
作者
何清
阮羚
罗维
王瑞珍
熊虎
HE Qing;RUAN Ling;LUO Wei;WANG Ruizheng;XIONG Hu(State Grid Hubei Electric Power Research Institute,Wuhan 430077,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第9期200-207,共8页
High Voltage Apparatus
