Invention Grant
US09270107B2 Method and an apparatus for supervision of current transformer in a differential protection system 有权
差动保护系统中电流互感器的监控方法和装置

Method and an apparatus for supervision of current transformer in a differential protection system
Abstract:
A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each winding in current transformer (CT) sets. A negative sequence current can be calculated from measured phase currents and a fault condition determined. A phase angle difference parameter derived from phase measurements between two healthy CTs can be used as an additional condition parameter for reliable operation of equipment in the electrical system.
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