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I have two nos 3.3/0.433 KV, 2000 kVA transformers in network having same percentage impedance (%Z) on nameplate. One is having load of 30% while other is 15%. when I try to connect these transformers by switching tie line on 0.433 kV side (HV sides are common bus), the transformer having higher load shares entire load and other gets totally unloaded. I have checked using tong tester. Can anybody explain the situation? Pl help.