NH-YJV Power Cable Extrusion Line

NH-YJV Power Cable Extrusion Line

The full name of NH-YJV cable is Fire-Resistant Copper Core XLPE Insulated PVC Sheathed Power Cable. It is a high-performance cable critical in fire scenarios.
Letter Meanings:
NH: Fire Resistant
This is its fundamental difference from ordinary cables. It means that under specified flame combustion conditions, the cable can maintain circuit integrity and normal operation for a certain period, i.e., continue to conduct electricity, providing power support for emergency lighting, firefighting equipment, and evacuation systems.
YJ: XLPE Insulation
The insulation layer uses cross-linked polyethylene, providing excellent electrical performance and heat resistance (90°C).
V: PVC Sheath
The outer sheath is made of polyvinyl chloride.
Key Concept Differentiation: Flame Retardant vs. Fire Resistant (ZR vs. NH):
Flame Retardant (ZR): Emphasizes the ability to prevent flame spread and avoid fire expansion. However, it does not guarantee that the cable will continue to function during a fire.
Fire Resistant (NH): Emphasizes the ability to maintain power supply in flames, serving as the last line of electrical defense for life safety.
Common Combinations: Cables can have both characteristics simultaneously, denoted as WDZN-YJY (Halogen-Free Low-Smoke Fire-Resistant Cable) or NH-YJV (Halogen-Containing Fire-Resistant Cable).
Fire Resistance Rating:
The cable must pass the national standard (GB/T 19216) fire resistance test, and the fire resistance time must be indicated in the model designation, such as:
NHA: Withstands combustion at 950°C~1000°C for 90 minutes.
NHB: Withstands combustion at 750°C~800°C for 90 minutes.
(Note: Rating classifications may be adjusted according to the latest standards; specific test reports should be referenced.)
Operating Temperature:
Long-term allowable operating temperature: ≤90°C.
Short-circuit temperature (max. 5s duration): ≤250°C.
Main Features:
Exceptional Fire Resistance: Core characteristic. Uses a fire-resistant structure, such as mica tape wrapping the conductor, to ensure the insulation structure remains intact under high-temperature flames and maintains electrical conductivity.
Excellent Performance: Inherits all the advantages of YJV cables, such as high current-carrying capacity and good heat resistance.
Disadvantages: The sheath of ordinary NH-YJV is made of PVC, which produces smoke and halogen acid gases when burned. Therefore, WDZN-YJY (Halogen-Free Low-Smoke Fire-Resistant Cable), an upgraded version, is preferred for places with extremely high safety requirements.

NH-YJV Power Cable Extrusion Line

The NH-YJV low-voltage power cable extrusion production line is a complete set of equipment specifically designed for manufacturing insulated cores and protective sheaths of power cables rated at 0.6/1 kV and below. Its core process involves melting solid plastics (such as PVC or XLPE) through heating and pressurization, then continuously and uniformly coating conductors (copper/aluminum wires) or assembled cable cores. After cooling and solidification, a smooth, dense, and uniformly thick insulating layer or protective sheath is formed.

Core Components

The NH-YJV power cable extrusion production line is a highly coordinated automated system, primarily consisting of the following major components:
Pay-off Unit:
Supports and releases the conductor or cable core, providing stable and controllable tension to prevent thinning or twisting of the conductor.
Preheater:
Heats the conductor before it enters the die head to remove moisture, reduce internal stress, and improve adhesion between the plastic and the conductor.
Extruder:
Screw: Conveys, compacts, melts, and homogenizes the plastic.
Barrel: Heats and cools the plastic.
Drive Motor: Provides power to the screw.
Die Head: Connects the extruder to the die.
Die (Tip and Die): Determines the thickness, concentricity, and shape of the extruded layer.
Cooling Trough:
Rapidly cools and solidifies the high-temperature cable. Typically features segmented temperature control to ensure material stability and avoid internal stress.
Haul-off Unit:
Provides the driving force for the production line. Its speed must be extremely stable, as it is critical for ensuring uniform extrusion thickness.
Spark Tester:
An online quality inspection device that applies high voltage to the insulating layer to detect defects such as pinholes or impurities, triggering alarms and marking the locations.
Take-up Unit:
Winds the finished cable neatly onto a reel, maintaining constant tension and synchronizing with the haul-off speed.
Control System:
Uses a PLC / industrial computer to centrally control all parameters (temperature, speed, tension, etc.), ensuring stable and reproducible production.

NH-YJV Power Cable Extrusion Line Datasheet

Model	70	80	90	100	120
Screw Diameter (mm)	φ70	φ80	φ90	φ100	φ120
Screw L/D Ratio	26:1	26:1	26:1	25:1	25:1
Extrusion Amount (kg/hr)	140	200	250	320	450
Outlet Wire (mm)	2-15	3-25	5-35	8-60	10-80
Total Power (KW)	40	55	63	120	165
Production Speed(Max., m/min)	300	200	200	100	80
Take-up Spool	500/800	800/1250	800/1600	1000/2000	2000/2500
Storage Length	240 m	200 m	180 m	0	0

NH-YJV Power Cable Extrusion Line Application

The NH-YJV low-voltage power cable extrusion production line is a complete set of equipment specifically designed for producing NH-YJV cables & other insulation cores and sheaths of power cables with rated voltage of 0.6/1kV and below. The details are as follows:

Conductor Insulation

Function: Extrudes insulating material onto copper or aluminum conductors to form the primary insulation layer.
Common Materials: Cross-linked polyethylene (XLPE), polyethylene (PE), polyvinyl chloride (PVC), etc.
Requirements: Uniform thickness, high concentricity, absence of impurities, and no microvoids. The insulation extrusion process for high-voltage cables demands the highest technical precision.

Sheathing Extrusion

Function: Extrudes a protective sheath over the assembled cable core.
Purpose: Provides mechanical protection, corrosion resistance, moisture resistance, UV resistance, flame retardancy, etc.
Common Materials: Polyvinyl chloride (PVC), polyethylene (PE), polyolefins, etc.