The mining explosion proof low voltage protection box used in movable transformer substation is used in explosive and dangerous coal mine where is filled with methane and coal dust, installed at low voltage side of movable transformer substation, it is used with our KJG series mining explosion proof intrinsically safe high voltage vacuum distribution device, form an ideal movable transformer substation system with low voltage fault breaking high voltage function. To supply power system with 3300V,1140V, 660V,380V/50Hz, rated current is below 1600V, has protection functions of electric leakage, leakage latch, short-circuit ,overload, phase balance, wind and electricity latch, etc. It can automatically cut off power when supplying power circuit is over-load, short-circuit, phase break or leakage. Over-current protection has inverse time-limited characteristics, proximal output short-circuit adopt no voltage releasing big current protection circuit.
Meaning of type
1. Outlets on two sides that fulfill multiplex load connection.
2.All faults drive breaker on high voltage side to break through signal cable, to decrease breaking current, overcomes the frequent breaking malfunction of switch on the low voltage side of movable transformer substation, also overcomes the dead zone problem which is electric leakage of the loop from transformer low voltage winding group to low voltage feeding switch, could not break down fault point, can match with different types of movable transformer substation.
3.Automactically trace voltage change, it is no necessary to change periphery circuit, make customers to use it conveniently.
4. When the switch is switching on or off, online thousand of ohms meter can indicate current insulation state all the time, convenient for maintenance in advance and adjust the network insulation degree.
|Mechanical life (T)||External diameter
|Main circuit||Control circuit|
|KJG-□/6Y||6||50, 100160, 200,250, 315,400, 500,630||12.5||31.5||2||10,000||42~78||9~23(2)||1165×1049×890||625|
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