66-500kv crosslinked cable short-degassing online treatment process

Abstract

The invention discloses a 66-500kV crosslinked cable short-degassing online treatment process. A process flow comprises conductor preparing; three-layer co-extruding and insulating and online degassing; and degassing in a drying room, wherein the step of three-layer co-extruding and insulating and online degassing specifically comprises three-layer co-extruding of a conductor shielding layer, an insulating layer and an insulating shielding layer; crosslinking; cooling; secondary heating; and cooling; the secondary heating is carried out under protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled over 98%, the nitrogen temperature is controlled at 220+ / -5 DEG C, and the conductor temperature is controlled at 90 DEG C. According to the 66-500kV crosslinked cable short-degassing online treatment process disclosed by the invention, the insulating layer is not aged during degassing, the degassing rate is high, the byproduct removal effect is good, the degassing time of the drying room can be greatly shortened, the production period is shortened, and energy is saved and emission is reduced.

Description

technical field

[0001] The invention relates to a cross-linked cable degassing process, in particular to a 66-500kV cross-linked cable short degassing on-line processing process. Background technique

[0002] For 66kV-500kV high-voltage power cables, by-products will be produced during the cross-linking process of the main insulation and exist in the insulation, which has a very large adverse effect on the insulation quality. Usually, the insulated core needs to be degassed. The degassing time is very long, generally 7 to 12 days, and the degassing temperature is 70°C. The shortcomings are: 1. Long degassing time, waste of energy, and long production cycle; 2. Degassing is carried out after the insulation production is completed, and the by-products inside the insulation are not completely removed; 3. The insulated wire core has been exposed to high temperature for a long time prone to aging. Contents of the invention

[0003] The purpose of the present invention is to p...

Examples

Embodiment 1

[0026] A 66-500kV cross-linked cable short degassing online treatment process, the process includes: conductor→three-layer co-extruded insulation and online degassing→drying room degassing. The following takes the rated voltage 110kV cable as an example:

[0027] Three-layer co-extrusion insulation and on-line degassing steps are as follows: three-layer co-extrusion of conductor shielding layer + insulating layer + insulating shielding layer → cross-linking (under the protection of nitrogen atmosphere, the nitrogen concentration of nitrogen atmosphere is controlled above 98%, nitrogen gas The temperature is controlled at 340°C, the temperature of the conductor is controlled at 150°C, and the frequency of exhaust gas during the cross-linking process is once every 20 minutes, each 2s) → cooling (under the protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled above 98%) , cooled to 40°C) → secondary heating (under the protection of...

Embodiment 2

[0031] A 66-500kV cross-linked cable short degassing online treatment process, the process includes: conductor→three-layer co-extruded insulation and online degassing→drying room degassing. The following takes the rated voltage 220kV cable as an example:

[0032] Three-layer co-extrusion insulation and on-line degassing steps are as follows: three-layer co-extrusion of conductor shielding layer + insulating layer + insulating shielding layer → cross-linking (under the protection of nitrogen atmosphere, the nitrogen concentration of nitrogen atmosphere is controlled above 98%, nitrogen gas The temperature is controlled at 340°C, the temperature of the conductor is controlled at 150°C, and the frequency of exhaust gas during the cross-linking process is once every 20 minutes, each 2s) → cooling (under the protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled above 98%) , cooled to 40°C) → secondary heating (under the protection of...

technical field

[0001] The invention relates to a cross-linked cable degassing process, in particular to a 66-500kV cross-linked cable short degassing on-line processing process. Background technique

[0002] For 66kV-500kV high-voltage power cables, by-products will be produced during the cross-linking process of the main insulation and exist in the insulation, which has a very large adverse effect on the insulation quality. Usually, the insulated core needs to be degassed. The degassing time is very long, generally 7 to 12 days, and the degassing temperature is 70°C. The shortcomings are: 1. Long degassing time, waste of energy, and long production cycle; 2. Degassing is carried out after the insulation production is completed, and the by-products inside the insulation are not completely removed; 3. The insulated wire core has been exposed to high temperature for a long time prone to aging. Contents of the invention

[0003] The purpose of the present invention is to p...

Examples

Embodiment 1

[0026] A 66-500kV cross-linked cable short degassing online treatment process, the process includes: conductor→three-layer co-extruded insulation and online degassing→drying room degassing. The following takes the rated voltage 110kV cable as an example:

[0027] Three-layer co-extrusion insulation and on-line degassing steps are as follows: three-layer co-extrusion of conductor shielding layer + insulating layer + insulating shielding layer → cross-linking (under the protection of nitrogen atmosphere, the nitrogen concentration of nitrogen atmosphere is controlled above 98%, nitrogen gas The temperature is controlled at 340°C, the temperature of the conductor is controlled at 150°C, and the frequency of exhaust gas during the cross-linking process is once every 20 minutes, each 2s) → cooling (under the protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled above 98%) , cooled to 40°C) → secondary heating (under the protection of...

Embodiment 2

[0031] A 66-500kV cross-linked cable short degassing online treatment process, the process includes: conductor→three-layer co-extruded insulation and online degassing→drying room degassing. The following takes the rated voltage 220kV cable as an example:

[0032] Three-layer co-extrusion insulation and on-line degassing steps are as follows: three-layer co-extrusion of conductor shielding layer + insulating layer + insulating shielding layer → cross-linking (under the protection of nitrogen atmosphere, the nitrogen concentration of nitrogen atmosphere is controlled above 98%, nitrogen gas The temperature is controlled at 340°C, the temperature of the conductor is controlled at 150°C, and the frequency of exhaust gas during the cross-linking process is once every 20 minutes, each 2s) → cooling (under the protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled above 98%) , cooled to 40°C) → secondary heating (under the protection of...

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