| 摘要 |
<p>An improved turn-to-turn short circuit detection device of transformer via differential voltage comprises a single-phase transformer (TM). The single-phase transformer (TM) comprises a high-voltage coil (K) and a low-voltage coil (N). A voltage transformer (PT) is positioned at the high voltage side of the single-phase transformer (TM). Two branches of a tap (K1) of the high-voltage coil (K) are connected with the input of a first converter (Q'), and a first voltage (U1') is obtained. The secondary side of the voltage transformer (PT) is connected with the input of a second converter (Q), and a second voltage (U1) is obtained, and the first voltage (U1') and the second voltage (U1) are compared, and when the voltage difference is above a predetermined primary threshold value, a turn-to-turn short circuit fault of the primary side is judged. A tap (N1) of the low-voltage coil (N) and one terminal of the low-voltage coil (N) are connected with the input of a third converter (M'), and a third voltage (U2') is obtained, and two terminals of the low-voltage (N) are connected with the input of a fourth converter (M), and a fourth voltage (U2) is obtained, and the third voltage (U2') and the fourth voltage (U2) are compared, and when the voltage difference is above a predetermine secondary threshold value, a turn-to-turn short circuit fault of the secondary side is judged.</p> |
