Triaxial Metal Al2O3 Insulated Electric Cable With 1.9 Sheathed

Silicon Dioxide Insulated Coaxial Or Triaxial Metal Sheathed Cable

Silicon Dioxide Insulated Coaxial or Triaxial Metal Sheathed Cable is with the cable conductor insulated with Silicon Dioxide power for extremely harsh environment and high security. It performs better against any other MI cable on electrical performance, high radiation resistance, long service life etc.

 

Due to all materials used are inorganic materials, can undoubtedly work in high temperature state, up to 1200℃. At the same time, the radiation resistance of inorganic materials is greatly higher than that of any other known organic materials, so they are widely used in nuclear power engineering.

This kind of coaxial cable, triaxial cable with different insulation materials, possess different electrical properties accordingly which can be used in different environments.

The general structure of triaxial and coaxial cables is as follows:

Stainless steel sheath

exterior insulating layer

Interior insulation layer

Triaxial cable construction

Stainless steel

conductor

Pure copper shield

Insulation materials

Stainless steel sheath

Pure copper shield

 

Coaxial cable sheath material generally uses 300 series of stainless steel as sheath material and conductor material for core. According to different requirements, generally the cable will be composed of stainless steel (304L), oxygen-free copper, pure nickel wire and steel cladded copper (stainless steel cladded oxygen-free copper). Different wire core materials have no effect on the electrical properties.

 

Table 1:

Name	Outside Diameter (mm)	Insulation Material	Line Capacitance(pF/m)	Insulation(Ω·m)	Withstand Voltage (DCV)
Coaxial cable	3,4,6	Al2O3	145	＞1013	3000/1min
		Silicon oxide	95
		Magnesium oxide	285

 

The conductor material of mineral insulated triaxial cable (conductor material) is generally of stainless steel (304L), oxygen-free copper, pure nickel wire and SS cladded copper (oxygen-free copper cladded with stainless steel) according to different requirements. The internal shielding material is commonly used: 316 stainless steel, copper lined stainless steel or oxygen-free copper.

Generally, the electrical performance requirements of triaxial cable are mainly between the conductor and the inner shield. Different application environments also have different requirements for capacitance and voltage resistance.

 

 

Table 2:

Name	Outside Diameter (mm)	Insulation Material	Line Capacitance (PF /m)	Insulation (Ω·m)	Withstand Voltage (DCV)
Triaxial cable	3,4,6	alumina		＞1012	3000/1min
		silica
		magnesia
	Internal Shield Diameter	Internal Insulating Material	Line Capacitance (PF /m)	Insulation (Ω·m)	Voltage Withstanding (DCV)
	1.8,2.4,3.6	Al2O3	160	＞1013	3000/1min
		Silicon Dioxide	105
		Magnesium oxide	300

Specification Code for the Coaxial MI Cable

 

NMIT - 400-050

NMIST - 600/360-040

NMIT: armored mineral insulated coaxial cable

NMIST: Armored mineral insulated triaxial cable

400: outer diameter 4.00 mm

600/360: outer diameter 6.00mm, inner shielding diameter 3.6mm

D: high temperature

D: high temperature

050: conductor diameter 0.50mm

040: conductor diameter 0.50mm

E: Insulating material

E: Insulating material

L: alumina

L: alumina

S: silica

S: silica

M: magnesium oxide

M: magnesium oxide

 

 

Features

■ Optimised geometries to minimise surface transfer impedance

■ Designed to maintain screening performance of measurement chain

■ Very high insulation resistance to minimise signal losses

■ All cable supplied fully tested

■ Maximum operating temperature of 700 ºC in high neutron flux fields

■ Dimensions and lengths can be adapted to particular applications