A METHOD FOR DETECTING FAULT AND CURRENT DIFFERENTIAL PROTECTION SYSTEM THEREOF

摘要

The present invention discloses a method for detecting fault and current differential protection system thereof. The method for detecting fault comprises: calculating fault component currents; calculating the operate current and restraint current of all terminals; and adjusting the operate level by adapting an operate restraint characteristic according to the fault component� it has very small operate area for external fault� which makes it very reliable even for the case with serious CT saturation. While a very big operate area for internal fault makes it very sensitive for internal fault even for heavy load and high resistance fault.