analysis of cable connector failure in guangxi guangxi cable news-非凡电子娱乐

because of the different operation modes and conditions,

the technical level of construction personnel is different and the quality of cable accessories is uneven and so on,

the reasons for the failure of xlpe cable joint are also different.

to this end, yanzhou mining (group) co., ltd.

an analysis of the causes for the failure of xlpe cable joint.

the production process of poor cable joint.

the contact surface of connection hardware is not well handled.

due to production or storage conditions,

impurities in the wiring terminal or connecting pipe,

burr and oxide. this is not for people to pay attention to the defects,

but it has a serious impact on the quality of the connection.

in particular, the surface of aluminum is very easy to produce a hard and insulated aluminum oxide film,

the aluminum conductor connection is much higher than that of copper conductors.

conductor damage. the strength of the crosslinked insulation layer is larger, and the peeling is difficult.

when the construction workers cut the ring with an electrician knife,

sometimes simply mark with a hacksaw circumcision deep,

often lead to bad wire damage.

core line is not in place.

when the conductor is connected, the length of the insulation stripping is required to be connected with the hole depth of the 5mm,

however, due to the product hole depth is not standard,

it is easy to cause the stripping length is not enough or because of the connection of the wire to the end of the wire,

only through the thickness of the wall, the contact resistance increases and the heat generation increases.

the pressure is not enough.

today, the relevant information in the production process and standard drawings

only refer to the number of pits on each end of the cable connection,

without detailing the crimping area and the crimping depth,

construction personnel in accordance with the requirements of the pressure enough pit number,

but the effect can not be determined.

the main reasons for the lack of conductor connection are as follows:

crimping machine pressure is not enough.

crimping machine manufacturers more,

but there is no uniform standard,

some mechanical pressure clamp pressure pit narrow and pressure in place after the upper and lower die,

there are the implementation of foreign standards, and domestic wire nominal cross-section is not suitable.

connect the hardware gap.

connection fittings for use in most crosslinked cable joints

oil paper cable terminal and pressure pipe produced by fan type wire.

in theory, the effective section of the circular and fan shaped core is the same,

however, the actual operation shows that the effect of compression is very different.

due to the fact that the cross-linked cable conductor is a round core,

there is a large gap with the commonly used hardware,

compression can not reach enough compression force.

the contact resistance is inversely proportional to the applied pressure,

resulting in increased resistance.

the connection fitting section is a very important reason of xlpe cable joint heating.