Types and Application of Electrical Materials
Time：2016-12-29Source：本站(zhàn)
First, wire and cable
(A) of the instrument cable
(1) instrument cables: such as YVV, YVVP, etc., for instruments, apparatus and othe≥r electrical equipment in the signal transmission and control lines.
(2) flame retardant instrument cables: such as ZRC-YVVεP, ZRC-YYJVP, ZRC-YEVP, etc., flame retardant instrument cable with high anti-jamming δperformance, electrical performance and reliable transmissio n of 300V AC and below digital signal and analog Signal, both the characteristics of fire-retardant, so this type of cable is widely used in detection and control of computer sysΩtems or automatic control devices. When the laying of the ambient temperature of not less th∞an 0 ℃, bend radius of not less than 10 times the cable diameter of the fire place.
(3) Instrumentation control cables: such as KJYVP, KJYVPR, KJYVP2, etβc., for AC rated voltage 450 / 750V and below instrument control cable products≠, circuit detection device shielded cable using twisted aluminum composite membrane shielding♠ and copper shielding, Anti-interference performance, commonly used in computer monitoring a<nd control devices.
(B) electrical equipment, wires, cables
1. Insulated wire
Insulated flexible wire. PVC insulated flexible wire: such as RV, RVB, RVV♠, RVVB and so on.
For example, the general family and office lighting is usually used BV or BX-typ•e PVC insulated copper core wire as the power cable; mechanical and electεrical installation site welding machine to the welding tongs to conneπct more use of RV-type PVC insulated parallel copper core Soft wire, ≥because the welding position is not fixed, and more mobile.
2. Power cable insulation materials can be divided into oil-impregnated paper insula♥tion, plastic insulation, rubber insulation and gas insulation.
(1) oil-impregnated paper insulated cables: such as ZLL, Z♣L, laying in the dry indoors, the ditch, can not afford mechanical external f¶orce, and the protective layer of aluminum should be a neutral environment; ZQ30, ZβLQ30 In the room and mine, can withstand mechanical damage and ™greater tension.
(2) plastic insulated cables: can be divided into PVC cables, polyeth§ylene cables, XLPE cables.
PVC cables: such as VLV, VV, etc., can not be subject to mechanical external force >for indoor, tunnel and pipeline laying; VLV22, VV22, can withγstand mechanical external force, but can not withstand large pull, can be laid in the gro≈und ; VLV32, VV32, etc., can withstand mechanical external force, and can withstand considerableγ tension, can be laid in the shaft, high-rise building cable sha¥ft, and for wet places.
(3) rubber insulated cables: such as XLQ, XQ, laying in≥doors, within the tunnel and pipeline, the cable can n÷ot be affected by the push and mechanical external force on the lead protective layer s∑hould have a neutral environment, such as XV20, XLV20, Indoor, within the tunnel and pipe, ca±n withstand mechanical damage, but can not afford a large pull.
(C) control of wire and cable
Control cables are often used in electrical control systems and power δdistribution devices, fixed laying. General control circuit load intermittent current is small≠, so the core section is small, usually 10mm2 the following, the control cable core to us∏e more copper conductor.
According to the insulation material, divided into polyethylσene, polyvinyl chloride and rubber. Of which the electrical properties of polyethylene for th e best, can also be used in high-frequency lines. Control cable insulation core is mainly concentric-type €twisted, there are some control cables using twisted-pair. The long-term allow↓able operating temperature of the control cable core is 65 ° C.
X is rubber insulation, Y is polyethylene insulation, V is PVC insulation; Sheath shieldiδng type: V is PVC jacket, Q is the lead sheathing (Q) is the •plastic sheath of the cable, the cable is used to control the cable, insulation material: , Y for the polyethylene sheath, P for the braided shield; the latter two→ figures in the first two of the steel armor, 3 for the thin round steel wire armor, the second in the 2 for the polyvinyl chloride Protective layer, 3 f∑or the polyethylene outer layer, copper symbol is omitted♥.
Second, insulation materials
1. According to their physical state can be divided into gas insulation materials, liquid insulating materials and solid insulation materials.
Gas Insulating Materials: Air, nitrogen, sulfur dioxide and sulfur hexafluoride (SF6).
2. According to their different chemical properties, can be divided ≥into inorganic insulating materials, organic insulating materials and mix≠ed insulation materials.
