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Generator self-balancing differential ground relay protection is a method for detecting stator ground faults on solid or resistance-grounded three-phase generators. Stator-to-ground faults are the most
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load current. It applies the percentage ratio differential characteristic shown in Figure 2. As the restraining current is the scalar sum of the zero-sequence current at each terminal, the relay sensitivity is not affected by load current. When the zero-sequence current differential protection operates, it performs
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Relay 87 Differential. Large up to 50 MW; 14 Large Machine ProtectionIEEE C37.102. Unit Connected, High Z Grounded; 32 Reverse Power 40 Loss of Excitation 46 Negative Sequence 49 Thermal Overload 51V voltage restraint 51G Ground overcurrent 64 Ground Relay 87 Differential. 15. SR489 Protection Functions. Protection Functions Include
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Differential Protective Relay 87 (ANSI CODE) is a protective relay that functions on a percentage or phase angle or other quantitative difference of two currents. The example taken here is a Siemens relay of Reyrolle-7SR24 model. It is a numerical three phase differential protection relay used to detect in zone phase and earth faults.
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Differential current relay (ANSI/IEEE 87) Differential current protection shown for "C" phase winding only. In a real system every phase would have its own CTs and differential current (87) relay. If the CT primary currents I C1p and I C2p are equal and the CT ratios are equal, the CT secondary currents I C1s and I C2s will be equal as well ...