Assessing risk associated with operating power facity

Assessing risk associated with operation of power facility is focused in estimation of current in all possible variants of its flowing through the human body, which turned out to be under voltage after touching conductor or some part of power facility not purposed to transfer electricity but being under voltage because of insulation damage, or under pace voltage.

Power lines are of two types: AС and DC. Alternative current power lines can be one-phase or polyphase. The most wide spread polyphase power lines are three-phase AC power lines. Depending on mood of neutral operation power lines are ones with insulated neutral and ones with grounded neutral. Insulated neutral means that power line neutral wire is insulated from grounding or is connected to it through facility with very high resistance (voltage transformer, compensation coil). Neutral is called grounded when it is connected to grounding directly or through facility with small resistance (current transformer).