1. The difference between power supply AC and DC is that power cord AC is the wire that passes alternating current and power cord DC is the wire that passes direct current.
2. Power cord can be divided into AC AC power cord and DC DC power cord according to the use, usually AC power cord is through the higher voltage alternating current wire, this type of wire due to the higher voltage needs to be standardized to obtain the safety certification before the official production.
3. DC line is basically through the lower voltage DC power, so the safety requirements are not as strict as the AC line, but for security reasons, the countries still require a unified security certification. Because the DC power supply is a direct current power supply, so the device that maintains the formation of a steady current in the circuit. Such as dry cell batteries, storage batteries, DC generators, and so on.
Extended information:
Every day in the production of power cords, power cords a day to more than 100,000 meters, 50,000 plugs, such a huge number of data, the production of its process must be very stable and mature. After continuous exploration and research and the European VDE certification body, the national standard CCC certification body, the United States UL certification body, the British BS certification body, Australia's SAA certification body, such as the recognition of the power cord plug has matured, the following to the introduction:
1, the power cord copper, aluminum monofilament pulling
Power cord commonly used in the copper, aluminum rods at room temperature, the application of the wire drawing machine After one or several stretching mold die hole, so that its cross-section reduction, length increase, strength progress. Drawing is the first process of each wire and cable companies, drawing the primary process parameters is the matching mold craft.
2, power line monofilament annealing
Copper, aluminum monofilament heated to a certain temperature, in order to recrystallize the method to improve the toughness of the monofilament, monofilament strength, in order to meet the wire and cable on the conductive core requirements. Annealing process is the key to eliminate the oxidation of copper wire.
3, the power line conductor stranded
In order to improve the flexibility of the power line, in order to facilitate the laying device, the conductive core acceptance of multiple monofilament stranded. From the conductive core of the stranded way, can be divided into the rules of stranding and non-rule stranding. Non-rule stranding is divided into bunch stranding, QiCentered double stranding, extraordinary stranding and so on. In order to reduce the occupied area of the wire, reduce the geometric size of the power line, in the stranded conductor is also used to tighten the way, so that the ordinary round variant of the semi-circular, fan-shaped, tile-shaped and tightened round. This conductor is mainly used in the power line.
4, power line insulation extrusion
Plastic power line is the primary use of extruded solid-type insulation, plastic insulation extrusion of the primary technical requirements:
(1) degree of bias: the bias value of the thickness of the extruded insulation is the performance of extrusion to the degree of work technology is the main mark, the construction of most of the product dimensions and its bias value in the specification have clear rules.
( 2 ) lubricity: the extruded insulation layer appearance requires lubrication, shall not present the appearance of rough, burnt, impurities of poor quality
( 3 ) denseness: extrusion of the insulation layer of the cross-section should be dense, robust, forbidden pinhole visible to the naked eye, and eradicate the presence of bubbles.
5, power cord into line
On the multi-core power cord in order to manage the degree of molding, reduce the shape of the power cord, the ordinary need to be stranded into a round. The mechanism of stranding and conductor stranding is similar, because the stranded section diameter is larger, most of the non-retractive twisting method.
Craft requirements for cable formation: one is to eradicate the shaped insulation core turn over and incur cable twisting; the second is to avoid the insulation layer is scratched. Three-core waterproof power cable large part of the cable in the cable is also accompanied by the completion of two other processes: one is filled, to ensure that the cable after the cable round and unchanged; one is tied, to ensure that the cable core is not slack.
6, the power line within the protective layer
In order to maintain the insulated wire core is not armored by the pimple, the need for proper maintenance of the insulating layer, within the protective layer: extruded packet within the protective layer (isolation sleeve) and around the packet within the protective layer (cushion layer). Wrap around the layer of padding instead of tying tape and cable process is synchronized.
7, power line armor
Laying in the underground power line, the task of accepting the effect of certain positive pressure, you can choose to armor the structure of the inner steel belt. Power line laid in both positive pressure effect and tensile effect of the place (such as water, vertical shafts or fall in the soil of large differences), should be selected with internal steel wire armor construction type.
8, power line sheath
The outer sheath is to maintain the insulation layer of the power line to avoid corrosion of the structure of the elements of the situation part. The primary effect of the outer jacket is to improve the mechanical strength of the power cord, chemical erosion, moisture, water immersion, to prevent the power cord burning and other capabilities. According to the different requirements of the power line application of extrusion molding machine directly extruded plastic sheath.
Reference: