A few days ago, the 240MVA/220kV first-class energy efficiency three-phase on-load voltage regulating
power transformer produced by Qingdao Hengfengyou Electrical Engineering Co., Ltd. successfully passed all the type tests including the short-circuit capacity test at the Shandong Electric Apparatus Research Institute.
The
transformer model is SSZ22-240000/220, the voltage ratio is 230±8x1.25/121/38.5kV, and the impedance is 14-24-8%. Since 2019, State Grid and China Southern Power Grid have strengthened the assessment requirements for the short-circuit resistance of transformers, especially the requirements for medium and low short-circuit resistance.For ordinary impedance
transformers, since the low-voltage capacity is only half, and the medium-low impedance is only 8%, it means that the low-voltage short-circuit current should reach more than 21 times the rated current, which is much larger than the short-circuit current of a conventional 220kV transformer 6-8 times.The successful test of the
transformer marks that Qingdao Hengfengyou Electrical Engineering Co., Ltd. has successfully entered the ranks of first-class domestic suppliers of 220kV
transformers.
The company's 240MVA/220kV
transformer passed the short-circuit test at one time, proving the high safety and reliability of Qingdao Hengfengyou products. It further enhances the comprehensive competitiveness of the company's products and provides a strong guarantee for market development.
