220kv step-down substation electrical system

• Main Authors: LI FENG, ZHANG YUFENG, YANG SHUAI, MENG ZHI, LIU SHUHAN, LIU SIGANG, WANG KAI, LIU QIHAO, SUN LIMEI, GENG JUNQI, MOU TAO, ZHANG ZHIGUO, ZHANG QIUYAN, ZHANG YING, LI AOJIA, BIAN ZHENHUA, MENG FANHUI, SUN YUJING, TIAN JIN, LI JINYU
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2017
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The present invention relates to the substation technology field, especially to an electrical system. The system comprises two transformers which both employ three-phase three-winding step-down transformers of a 120MVA duplex winding mode, the transformers form the power voltage with a 220kv voltage grade and the secondary voltage with 110kv voltage grade and the secondary voltage with the 35kv voltage grade, the 220kv line supplies power to the transformers through two load lines, four outgoing lines are arranged, 6 110kv bus outgoing lines are arranged at the middle voltage side, and 10 35kv bus outgoing lines are arranged at the lower voltage side. The 220kv bus and the 110kv bus both employ double-bus wiring modes, and the 35kv bus employs a single bus section wiring mode. Through adoption of the technical scheme, the 110kv step-down substation electrical primary system realizes the substantial advantages of efficient operation and convenient maintenance on the premise of power distribution reliability, e