低压配电系统五大接地型式（Five types of earthing for low voltage distribution system）.docVIP

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低压配电系统五大接地型式（Five types of earthing for low voltage distribution system）.doc

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低压配电系统五大接地型式（Five types of earthing for low voltage distribution system）

低压配电系统五大接地型式（Five types of earthing for low voltage distribution system） Grounding type low-voltage distribution system are IT, TT, TN, C, TN-C TN-S - - S five 2009-02-27 21:46 I. advantages and disadvantages of various Earthing Types and their adaptability 1, IT system advantages and disadvantages and adaptability The wiring mode is shown in figure 1. The main advantage of the IT system is a single, small electric current, easy detachment, so it is not easy to cause personal injury or death accident of electric shock; two, protective earthing protection effect is good, can effectively play the function of grounding protection; three, can inhibit the low voltage line or high voltage lightning with the form the transformation or inverse voltage; four, two line for high pressure operation of power grid, to avoid (low voltage of neutral point grounding) or inhibit (low voltage of neutral point grounding through impedance) high voltage side and bench insulation breakdown through a grounding wire into the ground and the formation of distribution transformer of low-voltage power grid (counter over voltage). The IT system is the main disadvantages: (1) a phase grounding, other phase to ground voltage is increased by 3 times, the neutral line to ground voltage is increased to 220V, will increase the possibility and degree of damage of electric shock at this time; (2) low voltage power grid lightning current to leak occurs, Yinlei lightning overvoltage caused by insulation breakdown of low-voltage power grid; (3) high voltage line and low voltage line or ride even distribution between high and low voltage winding insulation breakdown, the low-voltage power grid over-voltage caused by insulation breakdown accident or dangerous. In order to raise its length and avoid its short, the IT system is adapted to a pure natural power station or neutral line with no neutral line output The merits and demerits of 2 and TT value systems and their adaptability The wiring mode of the TT sy