在全球能源问题日益严峻的形势下,特高压交流输电技术将获得大量应用。特高压变压器作为输电线路的重要设备之一,其质量和可靠性直接关系到电力系统的安全稳定运行。目前,特高压变压器的抗短路电流能力还需依赖仿真验证的方式。该文从...在全球能源问题日益严峻的形势下,特高压交流输电技术将获得大量应用。特高压变压器作为输电线路的重要设备之一,其质量和可靠性直接关系到电力系统的安全稳定运行。目前,特高压变压器的抗短路电流能力还需依赖仿真验证的方式。该文从变压器短路试验要求出发,对1 000 k V等级特高压变压器开展短路试验的技术方案及最小系统需求进行了分析,并提出了大致的设备投资规模。展开更多
This paper compares the estimated electromagnetic forces due to short circuits in power transformers using two computational models. The first model is based on approximate analytical expressions of the electromagneti...This paper compares the estimated electromagnetic forces due to short circuits in power transformers using two computational models. The first model is based on approximate analytical expressions of the electromagnetic lbrces as they have been compiled in earlier versions of the IEC standard 60076-5. The second model is based on a finite element model of the transformer using the software FEMM （Finite Element Method Magnetics）. The paper shows how valid the analytical model is for design purposes. Results have been obtained and compared from both models in a number of actual power distribution transformers. It is possible to conclude that the analytical formulation provides satisfactory results for the design of power transformers compared to detailed finite element models. A tool has been designed for this purpose and the main features of it will be described in the paper.展开更多
文摘在全球能源问题日益严峻的形势下,特高压交流输电技术将获得大量应用。特高压变压器作为输电线路的重要设备之一,其质量和可靠性直接关系到电力系统的安全稳定运行。目前,特高压变压器的抗短路电流能力还需依赖仿真验证的方式。该文从变压器短路试验要求出发,对1 000 k V等级特高压变压器开展短路试验的技术方案及最小系统需求进行了分析,并提出了大致的设备投资规模。
文摘This paper compares the estimated electromagnetic forces due to short circuits in power transformers using two computational models. The first model is based on approximate analytical expressions of the electromagnetic lbrces as they have been compiled in earlier versions of the IEC standard 60076-5. The second model is based on a finite element model of the transformer using the software FEMM （Finite Element Method Magnetics）. The paper shows how valid the analytical model is for design purposes. Results have been obtained and compared from both models in a number of actual power distribution transformers. It is possible to conclude that the analytical formulation provides satisfactory results for the design of power transformers compared to detailed finite element models. A tool has been designed for this purpose and the main features of it will be described in the paper.
