Off-line A.C. Power and energy measurement in destructive tests. Accuracy and uncertainty

Some electrical equipment tests are destructive tests. These tests check the behavior of the equipment during the transients of currents and voltages. Frequently, the time interval of the test is several tens or hundreds milliseconds. The human observer cannot analyze the parameters of interest that characterize the evolution of equipment. Therefore, the computer assisted transient recorders are used to store the sampled values of the measuring signals generated by the transducers integrated in test assembly. The analysis and measurement of recorded quantity are made off-line using transient waveforms and user defined special functions. The paper presents a method to determine the uncertainty in off-line measurement of the electric power and energy, based on recorded data during the destructive tests.