The invention provides a method, a device and a
system for testing the
capacitive current. The method comprises the following steps: respectively and electrically connecting the test terminals m of the current output module of a
capacitive current testing device with the a-phase terminal, the b-phase terminal and the c-phase terminal of a switch cabinet electrified indication device; electricallyconnecting the grounding terminal o of the current output module of the
capacitive current testing device with the grounding terminal of the switch cabinet electrified indication device; controlling the high-frequency
voltage module of the capacitive current testing device to output an abnormal-frequency current
signal; acquiring the abnormal-frequency
voltage of the current output module of the capacitive current testing device under the abnormal-frequency current; according to the abnormal-frequency current
signal and the abnormal-frequency
voltage of the current output module under the abnormal-frequency current, calculating to obtain the total ground
capacitance of a neutral point ungrounded
system; and calculating to obtain the ground capacitive current according to the total ground
capacitance. According to the method, the test loop is simple. The ground
capacitance of each phase of the power
system, relative to the ground, can be calculated respectively. Meanwhile, the conditionof power outage is not required and the safety is high. The method can be used for testing the capacitive currents of ungrounded systems.