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Relay coordination
Insights

Principle of High-Impedance Bus Differential Relay (87BB)

December 10, 2019January 13, 2020admin1 Comment

The high-impedance protection scheme includes the CTs with a high impedance to force the error differential current through the CTs instead of the relay-operating coil. The basic principles are shown in Figure 2. During the external fault condition, the maximum voltage VR
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Insights

Consideration of Thermal Damage Curve for Protection Coordination Through Dyn Transformer (Solidly Grounded System)

December 10, 2019December 26, 2019adminLeave a comment

The damage to transformers from through fault can be the result of both thermal and mechanical effects, which are a significant cause of transformer failure. Therefore, the overcurrent protective devices such as fuses and 50/51 relay shall have the well-defined operating characteristics
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  • Principle of High-Impedance Bus Differential Relay (87BB)
  • Consideration of Thermal Damage Curve for Protection Coordination Through Dyn Transformer (Solidly Grounded System)
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Recent Insights And News

Relay coordination
10 Dec

Principle of High-Impedance Bus Differential Relay (87BB)

The high-impedance protection...
10 Dec

Consideration of Thermal Damage Curve for Protection Coordination Through Dyn Transformer (Solidly Grounded System)

The damage to...
10 Dec

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