The health maintenance of linemen working at overhead transmission lines under induced voltage requires compliance of these voltages’ limit values. To ensure compliance with these requirements have been developed algorithms for calculating of currents and voltages distribution along the grounded phase/cable of disconnected power line, induced by the electric field of operating three-phase overhead power line without transposition, with full and incomplete complete phases transposition section .
In this paper have been considered the main principles of personnel protection against adverse influence of electromagnetic fields. The analysis of principles and criteria for protection of personnel performing service and operation of power supply network facilities and an overhead contact system has been presented. Have been tested several samples of individual protection equipment for protection of electrical personnel against electric shock, adverse influence of electromagnetic fields of industrial frequency and concomitant factors, as well as when working at railroads’ overhead contact system and overhead power transmission lines with voltage up to 1150 kV inclusively whether on the Earth or wires potential, in the case of human protection in accidental situation, triggering to pace voltage. The considered screening kits as individual protection equipment are domestic product in which have been implemented innovative developments as part of the import substitution program. Has been shown the efficiency of personnel security ensuring during works on the Earth potential and live working, including possible accidental situations.
To prevent substation equipment damage and to ensure safety of substation personnel under high voltage and extremely high voltage (EHV) overhead transmission line (TL) outage on the example of 500 kV TL outage voltages between switchable phase switch contacts are calculated. It is shown that under operating in the idle mode EHV TL outage, after arc clearing between switch contact connected to the phase at TL beginning and earth aperiodic voltage with the highest value exceeding the peak value of nominal phase voltage is created.The switch contact connected to the mains voltage, relative to the ground remains periodic nominal phase voltage. The resulting voltage between open contacts of the switch becomes aperiodic shifted periodic voltage with highest value exceeding the double peak value of nominal phase voltage that can cause breakdown of the switch. If there is a break switch phase, it will light the arc and switch under arc will go idle mode operating current, the voltage will recover to idle mode value, the current will stop, the arc goes out, aperiodic voltage will appear, etc. Such a process in a closed cycle can last a long time. Thus, output voltages high values can cause breakdown along the switches surface, damage to switches and health risk factor for the staff performing the bypass substation.
This is continuation of the paper “Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Transmission Lines Outage. Part 1” where on the example of 500 kV overhead power transmission line (OHL) have been considered residual voltages arising between switch’s open contacts for each phase under outage of 500 kV OHL operating in idle mode. In the present paper have been carried out studies of residual voltages arising between phases switches under outage of 500 kV OHL. Maximal values of these resulting voltages exceed a double amplitude value of the OHL nominal phase value, and that may be the reason for a breakdown of the air gap between the switches, damage of the switches, and the risk for the personnel during a substation walk around.
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