What is the type of high voltage power cable connector?
The high-voltage power cable connector is used for the connection of the power cable itself, and has a connection joint, an insulated intermediate joint, a plugged-type joint for the oil-filled power cable, the steel pipe power cable, and the like.
1. ordinary connector
It is used to connect two adjacent power cables.
In the high-voltage power cable line, the straight-through connector is connected to the cable core conductor to ensure electrical connection, and the connector of the self-capacitative oil-filled power cable must keep the oil flow in the wire core unobstructed. However, because the connector is manually operated on site, the process conditions are poor. Therefore, the wire core connection is treated under the condition of crimping, and the electric field concentration problem at the wire core connection is treated, and the insulation thickness is increased to reduce the working field strength of the joint to ensure the safe operation of the joint. Generally, the insulation of the power cable is wrapped around the insulation, and the ends of the increased insulation form a tapered surface stress cone. The insulation shielding is wrapped around the wound insulation, and the power cables at both ends are insulated and shielded, and an outer bright steel pipe is used to isolate the insulation from the atmosphere, so that the oil pressure of the oil-filled power cable can be withstood.
2. Insulated joint
The insulation structure and dimensions of the insulated joint are the same as those of the ordinary joint. 110 ~ 220kV oil-filled power cable insulation joints, mainly used in large-length power cable lines, so that the metal sheath or metal shield and semi-conductive layer of the power cable at both ends of the joint are electrically disconnected for cross-connection and reduction The sheath (or shield) is worn out.
3. Plug connector
The plug-in connector is the weakest link in the electrical performance of the oil-filled power cable accessory and the most complicated connector. It is mainly used in the impregnated impregnated paper insulated power cable line with the drop difference larger than the specified value, cutting off the oil circuit, preventing the high-end power cable insulation from drying out, and the low-end power cable insulation oil pressure exceeding the specified value.
110kV single-chamber plug intermediate joint, usually with an epoxy casing to separate the oil flow of the two power cables.
220kV double chamber plug intermediate joint, two oil cables are used to separate the oil flow of the two power cables, and there is an outer cavity on the plugging tube of the two power cables, two inner chambers containing the power cable and An external cavity oil flow communicates in two sealed structures.
4. Steel pipe oil-filled power cable connector
The copper tube oil-filled power cable connector has two types of common connection connectors and half-plug connectors.
Ordinary connection connector for power cable manufacturing length connection, its internal insulation structure is generally between the self-capacitative oil-filled power cable connector, and the outer casing is a copper pipe with a diameter slightly larger than that of the power cable. Semi-plug joint for longer steel-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 an oil spill, which is used to separate the oil supply section so that the two sections of oil pass through the power cable insulation or bypass pipe. At the junction of the jointed steel pipe and the power cable steel pipe, the power cable oil path is separated by a sealing structure.