Leakage current detection protection method and device

• Main Authors: KANG JINGSONG, ZHANG FENGGANG
• Format: Patent
• Language: Chinese; English
• Published: 30.10.2020
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention relates to a leakage current detection protection method and device. The method comprises the following steps: a leakage current sampling step: carrying out discrete sampling on leakagecurrent; a leakage current calculation step: calculating a total leakage current effective value and a resistive leakage current effective value according to the sampling data; a continuous leakage current protection step: judging whether the main component of the leakage current is capacitive or resistive according to the effective value of the resistive leakage current, and then respectively taking corresponding continuous leakage current protection measures; and an abrupt change leakage current protection step: calculating the abrupt change amount and the abrupt change speed of the leakagecurrent according to the effective value of the resistive leakage current so as to calculate the abrupt change time reaching the abrupt change amount, and carrying out abrupt change leakage current protection according to the