Short circuit is seriously harmful to the traction power supply system of urban rail transit. The safe and reliable operation of DC overcurrent tripper of circuit - breaker and comprehensive automatic protection device can reduce the impact of short - circuit fault. Based on the short - circuit test of Jinan R3 line

how to arrange the test and measure its data reasonably and scientifically is discussed

and the test results of the short circuit remote and near substation are analyzed. The test results show that the protection equipment of Jinan R3 line is sensitive and reliable to short - circuit fault

which provides a reference for the short - circuit test research of DC power supply system.