Abstract
In the work experimental studies of the developed method for determining the insulation parameters in an asymmetric electrical network by a voltage up to 1000 V at mining enterprises were carried out. It is based on measuring the module values of line voltage, angle of phase shift between vectors of damaged phase voltage relative to the ground and line voltage at two other phases, as well on measuring the module value of damaged phase voltage relative to the ground before and after connecting additional capacitive conductivity between the network’s phases and the ground. The results of experiment showed that the developed method for determining the insulation parameters has satisfactory accuracy and safety when operating three-phase electrical networks by voltage up to 1000 V at mining enterprises.
Highlights
In the three-phase electrical networks by voltage up to 1000 V a lack of phase voltages symmetry takes place
It should be noted that active conductivity reducing the level of insulation (ACRLI) in a network with an isolated neutral by voltage up to 1000 V at mining enterprises characterizes the value of leakage current to the ground, as well as the value of touch voltage when the insulation is damaged
From the obtained equation (3), it follows that the developed method for determining the ACRLI in AENIN by voltage up to 1000 V, is based on measuring: 1) the module value of line voltage; 2) the angle of phase shift between vectors of the damaged phase voltage relative to the ground and the line voltage vector at two other phases; 3) the damaged phase voltage relative to the ground before and after connecting the additional capacitive conductivity (ACC) between the network’s phases and the ground
Summary
In the three-phase electrical networks by voltage up to 1000 V a lack of phase voltages symmetry takes place. By the value of ACRLI at one of electrical network’s phases relative to the ground, organizational and technical measures are developed to increase the level of electrical safety in the AENIN by voltage up to 1000 V at mining enterprises [1]. It is necessary to develop methods for determining the ACRLI in the network, as well as the capacitive and active components of insulation’s total conductivity in the three-phase AENIN by voltage up to 1000 V This will allow choose the right strategy for development of organizational and technical measures to increase the level of electrical safety in the networks by voltage up to 1000 V at mining enterprises
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