變壓器并列運行時負荷分配比例與短路阻抗關系的分析
周才康1，林治鵬2，丁斌1，王明虎1
(1 浙江愛力浦科技股份有限公司，浙江 三門 317100；
2 揚戈科技股份有限公司，浙江 三門 317100)
摘 要：變壓器并列運行需要考慮如何解決負荷分配隨各變壓器額定容量匹配的合理性問題，而短路阻抗是影響負荷分配比例的主要因素。介紹了變壓器并列運行的優缺點及并列運行的理想條件，以兩臺變壓器并列運行為例，分析了負荷分配比例與短路阻抗大小的關系。結果表明：額定容量不相等的兩臺變壓器并列運行時，要盡可能保證其短路阻抗相等，使每臺變壓器所帶的負荷根據各自的額定容量按比例進行分配；不能滿足短路阻抗完全相等的條件時，額定容量較小的變壓器短路阻抗應選擇大一些，額定容量較大的變壓器短路阻抗應選擇小一些，使并列運行后的系統總傳輸容量大于兩臺變壓器的額定容量之和，以提高系統運行的經濟性和安全性。
關鍵詞： 變壓器；并列運行；負荷分配比例；短路阻抗；滿載運行；傳輸容量
中圖分類號：TM406 文獻標識碼：B 文章編號：1007-3175(2024)06-0044-05
Analysis of the Relationship Between Load Distribution Ratio and Short-Circuit
Impedance When Transformers Are Running in Parallel
ZHOU Cai-kang1, LIN Zhi-peng2, DING Bin1, WANG Ming-hu1
（1 Zhejiang Ailipu Technology Co., Ltd, Sanmen 317100, China;
2 Yagertec Co., Ltd, Sanmen 317100, China）
Abstract: The parallel running of transformers needs to consider how to solve the rationality of the load distribution matching with the rated capacity of each transformer, and the short-circuit impedance is the main factor affecting the load distribution ratio. The advantages and disadvantages of parallel running of transformers and the ideal conditions for parallel running are introduced in this paper. Taking the parallel running of two transformers as an example, the relationship between the load distribution ratio and the short-circuit impedance is analyzed.The results show that, when two transformers with unequal rated capacity run side by side, it is necessary to ensure that their short-circuit impedance is equal as far as possible, so that the load carried by each transformer is distributed proportionally according to their respective rated capacity. However, when the short-circuit impedance cannot be completely equal, the short-circuit impedance of the transformer with smaller rated capacity should be larger, and the short-circuit impedance of the transformer with larger rated capacity should be smaller, so that the total transmission capacity of the system after parallel operation is greater than the sum of the rated capacity of the two transformers,so as to improve the economy and safety of the system operation.
Key words: transformer; parallel running; load distribution ratio; short-circuit impedance; full load operation; transmission capacity
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