Transformer Protection Relay Panel：Composition and Function
Transformer Protection Relay Panel is primarily used in automation systems for substations and distribution stations in power systems of 11kV, 33kV, 132kV and above. Its main function is to ensure that the transformer can promptly trip the faulty circuit in case of overload, short circuit, gas relay activation, and other abnormal operating conditions, thereby protecting the main transformer from damage and preventing the expansion of faults.
2025/11/24
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
Transformer Protection Configuration Principles
Transformer protection is critical for maintaining power system reliability. A well-designed transformer protection configuration must balance speed, selectivity, and sensitivity to prevent equipment damage and outages. Primary protection (e.g., differential and gas protection) acts instantly for internal faults, while backup protection (e.g., overcurrent, zero-sequence) provides redundancy for extended coverage. This guide covers key principles, settings, and coordination to optimize transformer protection schemes for different transformer types and voltage levels.
2025/08/11
