1. Common overhead line conductor models and options
The choice of wires and cables is determined by factors such as the environment in which they are used, operating conditions, and the like.
Outdoor overhead lines with 10KV and above voltage levels generally use bare wires, and 380V voltage levels generally use insulated wires.
Common models for bare wires:
(1) Aluminum stranded wire (LJ) has good electrical conductivity, light weight, strong resistance to wind and rain, but poor resistance to chemical corrosion, and is mostly used for 6~10kV lines.
(2) Steel-cored aluminum stranded wire (LGJ) is often used in applications where mechanical strength is required and overhead lines of 35kV and above.
(3) Copper stranded wire (TJ) has good electrical conductivity, good mechanical strength, and strong resistance to wind and rain and chemical corrosion, but the price is high.
2. Common power cable models
(1) Representation and meaning of power cable model
Cable category code:
Z—oil-impregnated paper insulated power cable V—polyvinyl chloride insulated power cable
YJ—cross-linked polyethylene insulated power cable X—rubber insulated power cable
Material code:
L—aluminum conductor LH—aluminum alloy conductor T—copper conductor TR—soft copper conductor
Inner sheath code:
Q—Lead bag L—Aluminum bag (not produced now) V—PVC sheath
Feature code:
P-Drip dry D-No drip flow F-phase split lead pack
Outer layer code:
02—polyvinyl chloride sleeve 03—polyethylene sleeve 20—bare steel belt armor
30—naked fine round wire armored 40—naked round wire armored
(2) Commonly used models and selection principles
1 plastic insulated power cable
The utility model has the advantages of simple structure, light weight, acid and alkali resistance, corrosion resistance, and convenient installation and installation.
There are two commonly used: PVC insulated and sheathed cables and XLPE insulated PVC sheathed cables.
2 oil-impregnated paper insulated power cable
This power cable is most commonly used. He has high compressive strength, good heat resistance and long service life. However, it is not suitable for occasions with large differences.
In the case of vertical or high drop, the insulated lead-clad power cable is dripped with oil-impregnated paper.
3. Commonly used insulated wire type selection
Plastic insulation has good insulation performance and low price, which can save rubber and cotton yarn, and is commonly used when laying indoors.
Commonly used plastic insulated wire models are: BLV (BV), BLVV (BVV), BVR.
A separate slip ring is a device that allows two or more rotating electrical shafts to be connected without having to pass the electricity through the shafts' bearings. This is often used in situations where there is a need to power something externally while the shaft is still turning. For example, a machine might have a drive shaft that powers it while also having a separate output shaft that needs to turn at a different speed. By using a separate slip ring, these two shafts can be powered without any interference.
Slip Ring Shaf is a key component of a slip ring. It is the shaft on which the rotary electrical contacts are mounted. The shafts must be strong enough to support the weight of the contacts and must be able to turn freely. There are many factors to consider when selecting a shaft material, including strength, corrosion resistance, and operating temperature.
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