For the purpose of improving the redundancy of the auxiliary power supply system of the metro vehicles. the grid connected power supply technology and the high-frequency converter technology were applied to line 4 and line 2 phase II project of the Ningbo metro. 4 SIV were grid connected to provide AC 380 V to the metro vehicles which grouping up with 4 motor cars and 2 trail cars. Me... https://cosmeticssquadets.shop/product-category/eyebrow-extension/