• Transformer inrush currents
• Transformer overexcitation in overvoltage
• Underfrequency situations
• CT saturation at high currents passing through the transformer
The differential current caused by CT errors or tap changer positions increases at the same
percent ratio as the load current.
In the protection of generators, the false differential current can be caused by various
factors.
• CT errors
• CT saturation at high currents passing through the generator
GUID-0E927DF9-5641-4CAE-B808-0B75EA09EA95-ANSI V1 EN
Figure 252: Operation logic of the biased low stage
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 509
Technical Manual
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