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S20 500kVA 20kv/0.4kv Low-Loss Oil-Immersed Transformer Zhengwei Brand, Find Details and Price about Oil-Immersed Power Transformer Distribution Transformer from S20 500kVA 20kv/0.4kv Low-Loss Oil-Immersed Transformer Zhengwei Brand - Jiangsu Zhengwei Electric Equipment Co.,Ltd