What are the types of high voltage power cable connectors?
The high-voltage power cable connecting head is used for the connection of the power cable itself, including the connecting joint, the insulation intermediate joint, the oil-filled power cable, the steel pipe power cable and the plug-type joint. 1.
Ordinary connector it is used to connect two adjacent power cables.
In the high-voltage power cable line, in addition to connecting the conductor of the cable core to ensure electrical connection, the connection head of the self-contained oil-filled power cable must keep the oil flow in the wire core unblocked.
However, because the connector is operated manually on site, its technological conditions are poor.
Therefore, under the condition of crimping, the online core connection adopts the treatment of the problem of electric field concentration at the connection of the core. By increasing the insulation thickness, the working field strength of the joint is reduced to ensure the safe operation of the joint.
Usually, the power cable insulation is wrapped around the insulation, and the two ends of the insulation are wrapped to form a conical surface stress cone.
The insulation shield is wrapped around the added insulation, connecting the insulation shields of the power cables at both ends, while an outer bright steel pipe isolates the insulation from the atmosphere, so that it can withstand the oil pressure of the oil-filled power cables. 2.
Insulation joint, insulation structure and size in insulation joint are the same as those of ordinary joint.
110 ~ 220kV oil-filled power cable insulation connector is mainly used in large length power cable lines to disconnect the metal sheath or metal shielding layer and semi-conductive layer of power cables at both ends of the connector from the electricity so as to facilitate cross interconnection, reduce the protective layer (Or shielding layer> loss. 3.
Plug-In connector plug-in connector is the weakest link in the electrical performance of oil-filled power cable accessories, and is also the connector with the most complicated structure.
It is mainly used for cutting off the oil circuit in the sly impregnated paper insulated power cable lines with a drop greater than the specified value to prevent the high-end power cable insulation from drying up and the low-end power cable insulation oil pressure exceeding the specified value.
The 110kV single-chamber plug Intermediate Joint usually uses an epoxy sleeve to separate the oil flow of the two power cables.
The 220kV double-chamber plug-stop Intermediate Joint uses two epoxy resin bushings to separate the oil flow of the two power cables, and has an external cavity on the plug-stop tubes of the two power cables, two inner cavities containing power cables and one outer cavity are connected by oil flow, showing two sealed structures. 4.
Steel Tube oil-filled power cable connector copper tube oil-filled power cable connector has two kinds: ordinary connection connector and semi-plug connector.
The ordinary connection joint is used for making long connection of power cables. Its internal insulation structure is generally interphase with the self-contained oil-filled power cable joint, and its shell is a copper pipe with a diameter slightly larger than that of power cable pipes.
Semi-plug joint is used for long steel pipe oil-filled power cable lines.
It is a joint designed to avoid the loss of a large number of power cable sleeves in the event of oil leakage accidents. It is used to separate the oil supply sections so that the oil in the two sections passes through the power cable insulation layer or bypass pipe.
At the joint between the steel pipe of the joint and the steel pipe of the power cable, a sealed structure is adopted to separate the oil circuit of the power cable.