低烟无卤控制电缆--控制电缆的作用、型号_Anhui Honglin Instrument Cable Co., Ltd.

Function and model of control cable

Author：hlyb Add Time：2016-05-28 08:22:32

What are control cables, power cables, hard cables and soft cables? How are they divided and where are they used?

Question supplement: where are hard cables generally used and where are soft cables generally used? Is there any connection between hard cable and soft cable?

What is the control cable, which is used for control and constitutes the control loop (secondary loop)

What is the power cable, the cable that supplies power to the equipment

What is a hard cable? A cable core is a conductor. Compared with the soft cable below, it is mainly fixed laying

What is a flexible cable? The cable core is wound with thin copper wire to make the power cable of mobile equipment

Simple answer:

1. Generally, single core is called power cable and multi-core is called control cable!

2. There is no strict distinction between soft and hard. The key is the care sleeve material (there are 4 types of copper wire stranding 1.2.5.6 used). For example, silicone rubber is very soft and polyolefin is very hard

3 where it is used depends on the type of cable, because there are many categories of cables. Our company produces special cables, including control cables, computer cables, high temperature resistant fluoroplastic cables, rubber sheathed cables, compensation cables and power cables below 1KV

Cable

[electric cable; power cable] it is usually a rope like cable twisted by several or groups of conductors [at least two in each group]. Each group of conductors are insulated from each other and often twisted around a center. The whole outer surface is covered with a highly insulated covering layer

Wires and cables refer to materials used for power, communication and related transmission purposes. There is no strict boundary between "wire" and "cable". Generally, products with few cores, small diameter and simple structure are called wires, those without insulation are called bare wires, and others are called cables; The larger conductor cross-sectional area (greater than 6 mm2) is called large wire, the smaller (less than or equal to 6 mm2) is called small wire, and the insulated wire is also called cloth wire.

Wires and cables mainly include bare wires, electromagnetic wires, insulated wires for motors and electrical appliances, power cables, communication cables and optical cables.

The cable model consists of eight parts: 1. Purpose code - not marked as power cable, K is control cable and P is signal cable; 2、 Insulation code - Z oil impregnated paper, X rubber, V polyvinyl chloride, YJ cross-linked polyethylene III. conductor material code - not marked as copper, l is aluminum; 4、 Inner sheath code - Q lead package, l aluminum package, H rubber sleeve, V polyvinyl chloride sheath v. derivative code - D non trickling, P dry insulation; 6、 Outer sheath code 7. Special product code - th wet zone, Ta dry zone; 8、 Rated voltage - unit: kV

Questions about cable models

1. SYWV (y): physical foam polyethylene insulated cable TV system cable, video (RF) coaxial cable (SYV, SYWV, syfv) is suitable for closed-circuit monitoring and cable TV engineering

SYWV (y), sykv cable TV and broadband network special cable structure: (coaxial cable) single oxygen free round copper wire + physical foamed polyethylene (insulation) + (tin wire + aluminum) + polyvinyl chloride (polyethylene)

2. Signal control cable (RVV sheathed wire, RVVP shielded wire) is applicable to building intercom, anti-theft alarm, fire control, automatic meter reading and other projects

3. RVVP copper core PVC insulated shielded PVC sheathed flexible cable voltage 300V / 300V 2-24 cores

Purpose: instrument, meter, intercom, monitoring and control installation

4. Kvvp: PVC sheathed braided shielded cable purpose: signal transmission, control and measurement of electrical appliances, instruments and power distribution devices

5. RVV (227iec52 / 53) PVC insulated flexible cable application: household appliances, small electric tools, instruments and power lighting

6. RV PVC insulated cable

7. RVs and RVB are applicable to cables for connecting household appliances, small electric tools, instruments, meters and power lighting

8. Application of BV and BVR PVC insulated cables: suitable for fixed wiring of electrical instrument equipment and power lighting

9. Purpose of KVV PVC insulated control cable: signal transmission, control and measurement of electrical appliances, instruments and power distribution devices

RVV and KVV RVVP and kvvp

Difference: the wires used in RVV and RVVP are flexible wires composed of multiple strands of fine copper wires, i.e. RV wires.

The wires used in KVV and kvvp are hard wires composed of single strand thick copper wires, i.e. bv wires.

Difference between avvr and RVVP: things are the same, except that the name of internal section less than 0.75mm2 is avvr, and the name of internal section greater than or equal to 0.75mm2 is RVVP

Difference between SYV and SYWV: SYV is polyethylene insulation for video transmission line. SYWV is a RF transmission line with physical foam insulation. For cable TV.

Difference between RVs and RVV 2-core: RVs is twisted by two-core RV wires without outer sheath, which is used for broadcast connection.

RVV 2-core wire is laid straight into a cable with outer sheath, which is used for power supply, control signal, etc

R - flexible cable (wire) for connection, flexible structure. V - insulated PVC. V-pvc insulation v-pvc sheath B-flat (flat). S-twisted pair. A - tinned or silver plated. F - high temperature resistance p - braided shield P2 - copper tape shield P22 - steel tape armor Y - prefabricated, generally omitted, or polyolefin sheath FD - product category code, referring to branch cable. The standards to be issued by the Ministry of construction are expressed in FZ, which are essentially the same

YJ - cross linked polyethylene insulation

V - PVC insulation or sheath

Zr - Flame Retardant

NH refractory

Wdz halogen free low smoke flame retardant

WDN - halogen free low smoke fire resistant type

Common calculation formulas for wires and cables

1. Sheath thickness: outer diameter before extrusion × 0.035 + 1 (in accordance with power cable, the nominal thickness of single core cable sheath shall not be less than 1.4mm, and the nominal thickness of multi-core cable shall not be less than 1.8mm)

2. Online measurement of sheath thickness: sheath thickness = (perimeter after sheath extrusion - Perimeter before sheath extrusion) / 2 π

Or sheath thickness = (perimeter after sheath extrusion - Perimeter before sheath extrusion) × zero point one five nine two

3. Insulation thickness * * * thin point: nominal value × 90%-0.1

4. Single core sheath * * * thin point: nominal value × 85%-0.1

5. Multi core sheath * * * thin point: nominal value × 80%-0.2

6. Steel wire armor: number = π × (outer diameter of inner sheath + diameter of steel wire) ÷ (diameter of steel wire) ×λ)

Weight = π × Wire diameter ²×ρ× L × Number of roots ×λ

7. Weight of insulation and sheath = π × (outer diameter before extrusion + thickness) × thickness × L ×ρ

8. Weight of steel strip = {π × (outer diameter before wrapping + 2) × Thickness - 1) × two × thickness ×ρ× L｝/(1+K)

9. Weight of tape = {π × (outer diameter before wrapping + number of layers) × Thickness) × Number of layers × thickness ×ρ× L｝/(1±K)

Where: K is the overlap rate or gap rate, if it is overlap, it is 1-k; In case of gap, it is 1 + K

ρ Is the specific gravity of the material; L is the cable length; λ Twist in factor.

Nominal thickness of sheath = assumed outside diameter before extrusion of sheath × 0.035+1mm

Metallic materials for cables

• 1. Copper

Conductivity * * * is inferior to silver, and thermal conductivity * * * is inferior to gold and silver; Corrosion resistant, non-magnetic, good plasticity, easy welding and wide application. Copper alloy is mainly used to improve the wear resistance, corrosion resistance and mechanical and physical properties of copper.

• 2. Silver

The metal has high conductivity and thermal conductivity, good corrosion resistance and oxidation resistance, and is easy to weld; Mainly used for coating and cladding; It is mainly used as high temperature resistant wire and (Note: according to the principle of skin effect) as high-frequency communication cable conductor.

• 3. Aluminum

Conductivity * * * is inferior to silver, copper and gold; Good thermal conductivity, good corrosion resistance, general mechanical strength, good plasticity and small specific gravity. The disadvantage is low tensile strength and difficult to weld. Aluminum alloy is mainly used to improve the mechanical strength, heat resistance and weldability of aluminum.

• 4. Gold, nickel

Used as high temperature resistant wire.

• 5. Iron (steel)

It is often used as reinforcing material for composite conductor, such as steel core aluminum wire, copper-clad steel, aluminum-clad steel wire, etc.

• 6. Zinc

It is used as the coating of steel wire / steel strip / iron conductor to prevent corrosion.

• 7. Tin

It is used as the coating of steel wire / copper wire to prevent corrosion and facilitate the corrosion of copper wire

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Function and model of control cable