Development of a Stand to Demonstrate Human Injury by Electric Arc Caused by Puncturing a 10 kV Cable Line
Abstract
A stand called «A Short-Circuit Fault Caused by Puncturing an Energized 10 kV Cable Line» has been developed, constructed, tested, and put in operation at the Rosseti (Russian Networks) Moscow Region Training Center by specialists of the NRU MPEI Chair for High Voltage Engineering and Electrophysics as part of the R&D work «Carrying out theoretical and experimental investigations and development of stands for demonstrating the danger of being injured by electric shock at a training ground». In developing the stand, the type and parameters of the power supply source, discharge circuit and switching device were selected. A single-phase step-up small-capacity 0,4/10 kV transformer with a diode is used as a power supply source. The discharge circuit consists of capacitive energy storage with a capacitance of 5 mF, an industry-grade reactor with an inductance of 1,8 mH, and a standard (gunpowder) remotely operated puncturing device. When cable line insulation is punctured, an arc short circuit fault occurs between the grounded shield and the cable core to which the energy storage potential is applied. The puncturing device serves as a switching device and the load jointly with the arc resistance. For the selected parameters of the stand elements and the energy storage voltage equal to 4 kV, a decaying oscillatory current pulse with the first half-wave amplitude equal to 7 kA and oscillation frequency of about 50 Hz has been obtained. With
these pulse parameters, it became possible to obtain tangible, but safe for students, light and sound effects during arc ejection. The stand can be repeatedly used with minor replacement of its individual elements on the territory of the operating substation without the risk of an emergency to occur.
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