Test Methods for Performance of Protective Devices Excited by Conducted Transient Electromagnetic Disturbance

This letter summarizes the existing test methods for protective devices and the waveforms of conducted transient electromagnetic disturbance in different standards. However, they mainly focus on the testing methods for the residual current of the protective devices or the response behaviors of the coaxial protector. To quantify the response performance of protection devices used in the power distribution system excited by electromagnetic transients, an optimal test method is then proposed. The test setup consists of a pulse generator, an absorption resistor, transmission lines, and the measurement system. The test results and simulation results of the 10-kV nongapped metal–oxide arrester verify the validation of the proposed method. By using the proposed method, the applied current and the current flowing through protective devices can be calculated so that the response time can be evaluated. Besides, this method can also be used to study the response of protective devices under other different disturbances.