Circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation

• Main Authors: YAO BIN, DAI CHENXIANG, TU LIMING, LI JISHENG
• Format: Patent
• Language: Chinese; English
• Published: 24.04.2013
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses a circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation. Circuit current is collected by the method, fundamental component of the circuit current is utilized for circuit differential motion protection calculation. When a differential protection action condition is met, protection is not conducted, and if the different protection action condition is met, the harmonic summarized component Ix on the side is calculated further. If the equation that Ix >0.15 is satisfied, delay Tx of lock different protection is confirmed according to a value of the Ix, when the Tx is delayed or the equation that Ix <0.15 is satisfied and the different protection action condition is met, the different protection is conducted, and if not, the different protection is locked. The circuit differential motion protection method utilizing the harmonic summarized information to prevent the saturated maloperation has high reliability and safety, can