Installation ; Cable size and Color
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Substation
Protection Relay Code / Short Name
21/21N = Distance Relay Phase & Ground 21BU = Backup Distance Relay 24L = Overexcitation Relay (Overfluxing Relay) 25 = Synchronizing Check Relay 27 = Under Voltage 27XR = Loss-of-DC Alarm Relay 32 = Reverse Power 33Q = Transformer Oil Level 40 = Loss of Excitation. 46 = Negative Phase Sequence Protection 48 = Locked
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