Motor Magnetic Balance Differential Protection Relay: Principles, Applications
The motor magnetic balance differential protection relay is an internal fault protection device used for medium- and high-voltage motors, detecting winding faults by comparing the current difference between the motor's input and neutral terminals.
2025/07/10
Transformer Differential Protection（ANSI 87T）: Working Principle, Function, and Setting Calculation
The working principle of the Transformer Differential Protection Relay is based on Kirchhoff's Current Law. This law states that the sum of currents entering a node is zero. Ideally, for a healthy (non-faulted) transformer, the current entering the primary winding should equal the current leaving the secondary winding (after accounting for the transformer's turns ratio and phase shift).
2025/11/12
Motor Differential Protection : Working Principle,Function and Setting Calculation
Motor differential protection serves as the primary protection for internal short-circuit faults in medium-to-high capacity motors (typically above 2000 kW or 6 kV). Its operating principle is based on Kirchhoff's Current Law.
2025/11/04
