LNG ultralow-temperature direct-current molded line medium-voltage coaxial cable

An ultra-low temperature, cable technology, applied in the field of cables, can solve the problems of brittleness, hardening of the insulating layer and sheath layer, and potential safety hazards.

Pending Publication Date: 2021-05-18
FAR EAST CABLE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Freon liquefied natural gas, liquid nitrogen, liquid helium, liquid oxygen, liquid hydrogen and other ultra-low temperature medium environment (-100 ~ -270 ℃), the temperature range of common low temperature cables is generally -40 ℃ ~ -60 ℃, it is applied to In an ultra-low temperature environment, the insulation layer and the sheath layer will become hard, brittle or even cracked, which brings safety hazards

Method used

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  • LNG ultralow-temperature direct-current molded line medium-voltage coaxial cable
  • LNG ultralow-temperature direct-current molded line medium-voltage coaxial cable

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preparation example Construction

[0051] The invention also discloses a method for preparing an LNG ultra-low temperature DC type line medium voltage coaxial cable, which includes the following steps:

[0052] Step 1: preparing the inner conductor 1;

[0053] Step 2: Wrapping the inner conductor 1 with a polyimide film tape, the overlapping rate is not less than 30%, and then sintering to form the shield 2;

[0054] Step 3: Extrude polytetrafluoroethylene with a melt index of 6-8g / 10min outside the shielding 2 to form an insulating layer 3, and place the polytetrafluoroethylene raw material at 120± Dry in an oven at 10°C for 1±0.5h, fully dry, and set aside; the temperature of the extrusion body of the extrusion mold is controlled at 320°C to 340°C, 340°C to 360°C, and 360°C in sequence from the first zone to the fourth zone. ℃~380℃, 380℃~400℃; the temperature of the flange is controlled at 380℃~400℃, the temperature of the machine head is controlled at 375℃~410℃; the appearance of the discharge material is u...

Embodiment 1

[0069] Such as Figure 1-2 As shown, a LNG ultra-low temperature DC-type medium-voltage coaxial cable includes an inner conductor 1, a shield 2, an insulating layer 3, an insulating shield 4, an outer conductor 5, and a copper tape wrapping 6 arranged coaxially from the inside to the outside. , tape 7, glass fiber protective layer 8 and outer sheath 9, the outer diameter of the insulated wire core composed of inner conductor 1, shielding 2 and insulating layer 3 is not greater than 11.1mm, the outer conductor 5 and inner conductor 1 are interconnected internally and externally, While playing the shielding role of the inner conductor 1 and equalizing the electric field strength of the inner conductor 1, the copper tape is wrapped with 6 gaps; the LNG ultra-low temperature DC type line medium voltage coaxial cable is not easy to break down, crack, and Thermal overload, stable electrical performance, long service life.

[0070] The inner conductor 1 adopts a 1+6 compact twisted ...

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Abstract

An LNG ultralow-temperature direct-current molded line medium-voltage coaxial cable comprises an inner conductor, a shielding layer, an insulating layer, an insulating shielding layer, an outer conductor, a copper tape wrapping layer, a wrapping tape, a glass fiber protection layer and an outer protection layer which are sequentially arranged from inside to outside, the inner conductor and the outer conductor are each of a compressed molded line twisting structure, and the outer diameter of the inner conductor is not larger than 6.9 mm. According to the LNG ultralow-temperature direct-current molded line medium-voltage coaxial cable provided by the invention, the inner conductor and the outer conductor are stranded compactly, the outer diameter is smaller than that of a conventional stranded conductor under the condition that the same section resistance is the same, and the obtained cable is small in outer diameter, low in cost, convenient to install and use, smoother in surface and free of gaps, the outer conductor and the inner conductor and interconnected inside and outside, the electric field intensity of the inner conductor is homogenized while the inner conductor is shielded, and the cable is not broken down in a direct current withstand voltage test of 21 kV / 5 min, is not cracked when stretched at an ultralow temperature of -276 DEG C, is not easy to generate heat and overload, is stable in electrical performance, is longer in service life, and is suitable for an ultralow temperature occasion.

Description

technical field [0001] The invention belongs to the technical field of electric cables, and in particular relates to an LNG ultra-low temperature DC-type medium-voltage coaxial cable. Background technique [0002] With the in-depth application of clean energy LNG (English full name: Liquefied Natural Gas, Chinese full name: Liquefied Natural Gas), some large LNG carriers, LNG shore-based storage tanks, LNG distribution pump stations, etc. The demand is increasing year by year. Freon liquefied natural gas, liquid nitrogen, liquid helium, liquid oxygen, liquid hydrogen and other ultra-low temperature medium environment (-100 ~ -270 ℃), the temperature range of common low temperature cables is generally -40 ℃ ~ -60 ℃, it is applied to In an ultra-low temperature environment, the insulation layer and the sheath layer will become hard, brittle or even cracked, which poses a safety hazard. Contents of the invention [0003] In order to solve the problems in the prior art, the ...

Claims

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Application Information

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IPC IPC(8): H01B11/18H01B3/30H01B13/016
CPCH01B3/306H01B11/1808H01B11/1852H01B11/1869H01B13/016H01B13/0162H01B13/0165
Inventor 吴国良徐静盛金伟丁红梅柴相花张慎学
Owner FAR EAST CABLE
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