Basic Principles of Protection of Human Life

BASIC PRINCIPLES OF PROTECTION OF HUMAN LIFE

1 Tap Jump (Direct Contact)
2 Tap Indirect (Indirect Contact) PUIL 2000

> Protection of humans from direct touch
Definition is "the contiguity of human or livestock with live parts" (PUIL 2000), such contacts occurred between members of the human body directly or livestock with live parts that will cause electric shock. "

Human protection in accordance with PUIL 2000

> Impedance of the human body

UC = ZT ID

> ZT depends on :
* Frequency
* Voltage touch
* Track the flow of electricity in the human body

> The hazard depends on :
* Strong noise current ID
* The length of time the flow of electricity through the human body
* At 50 Hz, sensitivity at the maximum rate.

Electric shock in humans, 15 to 100 HZ

> Effects of electric current to the human body

> Curve Left sec / mA current to AC current from 15 to 100 Hz

> Effects currents :
* Zone 1: bounded by the curve "a", cut no effect
* Zone 2: bounded by the curve "b", the line between perception and uncomfortable
* Zone 3: is limited by the curve "c3", non-convenient, there is the risk of muscle contraction, including heart curve "c1" determines the limits of risk, 0%. Curve "c2": possible 5% curves "c3": the possibility of 50%
* Zone 4: BGN dr c3 curve, the possibility of large LBH dr pd 50% plus the possibility of heart stops beating.

Human protection from indirect touch

Definition is "the contiguity of human or animal with an open-voltage conductive parts in case of disturbance" (PUIL 2000). For example, contacts that occur between members of the human body / animals with open conductive parts which become stressed (due to interference isolation), resulting in electric shock. Touch not directly caused by the failure of basic insulation, the cause is :

> Installation time
* Mechanical damage on the cable insulation

> Operating time
* Dust conductive
* Aging thermal insulator due to excessive temperature
* The style occurs when short-circuit electrodynamic
* Voltage is more due to lightning
* Voltage is more due to the failure of insulation in medium voltage side

Type of protection from indirect touch with automatic supply disconnection

* Bumikan conductive parts are open all electrical equipment and all installation parts are easily touched which is conductive through the conductor PE
* Bumikan open conductive parts (BKT) all electrical equipment and all installation parts that are easily moved conductive
* 2 open the adjacent conductive parts connected with the same grounding electrode

* The automatic disconnection of supply by using protective devices for the isolation of harmful interference
* Protection devices must operate within a period compatible with the "Maximum time voltage tap" on the effect of current map - the duration of current flow in the human body.

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