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What are the types of high voltage power cable connectors?
2022-02-17
High-voltage power cable connectors are used for the connection of the power cable itself, there are connection joints, insulated intermediate joints, oil-filled power cables and steel power cables and plug stop type joints.
1. Ordinary connector
It is used to connect two adjacent power cables.
In the high-voltage power cable lines, through the joints in addition to connecting the core conductor to ensure that the electrical connection, the self-capacitance oil-filled power cable connector must keep the core of the oil flow unimpeded. However, because the connector is operated manually at the scene, its process conditions are poor. Thus, the line core connection using crimping conditions, the core connection of the electric field concentration of the problem of processing, by increasing the thickness of the insulation, so as to reduce the joint working field strength to ensure the safe operation of the connector. Usually in the power cable insulation is wrapped around the top of the insulation to increase the winding insulation, increase the winding insulation at both ends of the formation of a tapered surface stress cone. In the increased winding insulation outside the wrapped insulation shield, the two ends of the power cable insulation shield is connected, and its outside there is a bright steel pipe to the insulation and the atmosphere, so that can withstand the oil pressure of the oil-filled power cables.
2. Insulation joints
Insulated joints within the insulation structure and size and ordinary joints the same. 110 ~ 220kV oil-filled power cable insulated joints, mainly used for large lengths of power cable lines, so that the joints at both ends of the power cable metal jacket or metal shielding and semi-conductive layer electrically disconnected, so as to interconnect the cross, reduce the sheath (or shielding layer) loss.
3. Plug stop type connector
Plug stop type joint is oil-filled power cable accessories electrical properties of the weakest link, but also the most complex structure of the joint. It is mainly used for the fall greater than the specified value of the crafty impregnated paper insulated power cable lines, cut off the oil circuit, to prevent high-end power cable insulation dry, low-end power cable insulation oil pressure exceeds the specified value.
110kV single chamber plug stop intermediate joint, usually with an epoxy resin sleeve to separate the oil flow of the two power cables.
220kV double chamber type plug stop intermediate joint, with two epoxy resin casing will be two power cables oil flow separation, in the two sections of power cables plug stop tube above an outer cavity, two containing power cables and an inner cavity and an outer cavity of the oil flow is connected, was a two-way sealing structure.
4. Steel pipe oil-filled power cable joints
Copper pipe oil-filled power cable joints have ordinary joints and half plug stop joints of two kinds.
Ordinary connection joints, used for power cable manufacturing length connection, its internal insulation structure is generally with the self-capacitance oil-filled power cable joints between the shell is slightly larger than the diameter of a power cable pipe copper pipe. Half plug stop connector, used for longer steel pipe oil-filled power cable lines. It is designed to avoid the loss of a large number of power cable sleeves in the event of oil leakage accidents and joints, used to separate the oil supply section, so that the two sections of the oil through the power cable insulation or bypass pipe circulation. In the joint of the steel pipe and the power cable steel pipe connection, the use of sealing structure to separate the power cable oil circuit.