Abstract: A ground leakage current measurement apparatus in an ungrounded DC power system including positive and negative electric lines includes a switching unit configured to perform switching to supply measurement power to a positive side ground resistor and a negative side ground resistor by using power of the electric lines; a measurement unit connected between the switching unit and the ground and configured to measure at least one of positive and negative side ground leakage currents; and a control unit configured to control the switching unit to discriminate a positive side ground leakage current operation and a negative side ground leakage current operation of the measurement unit.

Abstract: Provided a ground leakage current measurement apparatus in an ungrounded DC power system including main and auxiliary electric lines includes: a switching unit configured to perform switching to supply measurement power to a main ground resistor and an auxiliary ground resistor by using power of the electric lines; a measurement unit connected between the switching unit and the ground and configured to measure at least one of main and auxiliary ground leakage currents; and a control unit configured to control the switching unit to discriminate a main ground leakage current operation and an auxiliary ground leakage current operation of the measurement unit.

Abstract: The present invention provides a make-up brush which comprises a brushing head and a stem, wherein both of the brushing head and the stem are separably combined. The user of the make-up brush can select a stem and a brushing head from a group of various stems and brushing heads to assemble brush.