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.
Calculation algorithm for Currents and voltages induced by electric field of operating overhead transmission line (OTL) along
dead and grounded parallel OTL is presented. The data indicates the coincidence of the results of calculation under OTL
parameters outside the "dead zone" obtained by Carson’ method and calculation with hequ method not having a "dead zone".
With the view of calculation methods accuracy increase duringcalculations by Carson’s method, by simplified Carson’s
method and by hequ method, we considered induced voltage parameters,currents and voltage distribution alonggrounded
on the ends single-wire transmission lines created by magnetic field of parallel single-wire operating line. It is shown that
hequ method, eliminating errors in the "dead zone" in calculation by Carson’s method, gives almost identical results outside
the "dead zone", and small differences with the results of simplified Carson’s method.
Assurance of workers and population’s electromagnetic safety represents a big relevance in connection with the increasing
electromagnetic pollution both of in-plant and natural environment and increase with respect thereto in risk of health loss.
Implementation of the principles for protection against electromagnetic fields (EMF) can be not always realized in practice
by time, distance, and application of collective and individual means of protection. The question of human being’s protection
against EMF has a high relevance especially in connection with potential carcinogenicity of some ranges and modes for EMF
generation. Relevance of enhancement of hygienic standards and control methods for EMF, especially taking into account
determination of values not only for falling energy, but for the absorbed one, has been demonstrated. The developed
modern principle for solution of the problem related to adequate assessment of EMF exposition using a combination of
numerical and experimental dosimetry methods, and investigational studies on animals has been separately considered.
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