Within paper there is made a synthesis of IEC standards requirements for testing at overload and short-circuit currents of low voltage equipment: switches, disconnectors, switch-disconnectors, contactors, fuses and fuses combinations with these. After this there is presented testing circuit for withstand ability at overload and short-circuit currents passing of low voltage equipment for a large range of currents through realisation of a special circuit for load adjustment. Also are described experiments performed on low voltage fuses-as type tests-and are established appreciation criteria regarding the behaviour at electric arc action due to overload and short-circuit currents.
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.
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