CN-122011615-A - Insulating material of high-voltage submarine cable and preparation method thereof

CN122011615ACN 122011615 ACN122011615 ACN 122011615ACN-122011615-A

Abstract

The invention discloses an insulating material of a high-voltage submarine cable and a preparation method thereof, comprising the following steps of S1, opening a material injection operation pipe through a limiting valve, injecting insulating material into an electric heating relay box through the material injection operation pipe by an external plastic extruding machine, S2, penetrating a cable wire core into the inner side of an outer sheath shaping mold after filling, driving a feeding pushing plate by a feeding hydraulic cylinder to push the insulating material to enter the shaping mold through a double-inlet multi-outlet pipe, and completing connection sealing and thickening sealing in multi-section lamination.

Inventors

XU XINXIN
ZHANG FAN
WU JINBO
LI YAJING
WANG YUEBIN
Zhuang Qinghan
LI ZHANG
CHEN YIQIN
KANG HAIDONG
Zeng Guangxuan
FENG YU
ZHANG YUNING

Assignees

三峡新能源阳江发电有限公司
广东阳江市创源海上风电综合投资有限公司
中国长江三峡集团有限公司
中国能源建设集团广东省电力设计研究院有限公司
宁波东方电缆股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (9)

1. The insulating material of the high-voltage submarine cable is characterized by comprising modified polyvinyl chloride resin, dioctyl phthalate, epoxidized soybean oil, a calcium-zinc composite heat stabilizer, spherical magnesium hydroxide filler, polyether ester lubricating regulator, an antioxidant and an antistatic agent.
2. The preparation method of the insulating material of the high-voltage submarine cable, which is disclosed in claim 1, is characterized in that the insulating material comprises 60-70% of modified polyvinyl chloride resin, 10-15% of dioctyl phthalate, 6-10% of epoxidized soybean oil, 3-6% of calcium-zinc composite heat stabilizer, 6-10% of spherical magnesium hydroxide filler, 1.0-2.0% of polyether ester lubrication regulator, and 1.0-2.0% of antioxidant and antistatic agent.
3. The preparation method of the insulating material of the high-voltage submarine cable is characterized by comprising the following steps of: S1, when the cable outer protective insulating sleeve is produced, firstly, a limiting valve (207) is used for opening an injection operation pipe (206), and an external plastic extruder is used for injecting insulating materials into an electric heating relay box (203) through the injection operation pipe (206); S2, after filling is completed, a cable core penetrates into the inner side of an outer sheath forming die (201), a feeding hydraulic cylinder (204) drives a feeding pushing plate (205) to push insulating materials to enter the forming die (201) through a double-inlet and multi-outlet pipe (202), full nesting of the cable core and the outer sheath is realized through multi-section feeding, and connection sealing and thickening sealing are completed in multi-section lamination; S3, after the insulation sleeve is manufactured, cooling water in the low-temperature liquid storage tank (301) is sprayed into the quick cooling tank (210) by the pumping pump (213) and the spray pipe rack (211) for preliminary cooling, and then the cooling water is introduced into the multi-cavity cooling tank (208) by the pumping pump (213) and the circulating communication pipe (209) to realize multi-cavity serial cooling of the cooling water flowing from bottom to top; s4, in the process, the insulation sleeve is contacted with the cooling box (208) to generate heat exchange, a retarded cooling mode is adopted to avoid micropores or cracks caused by thermal stress and crystallinity mutation, and cooling and forming speed is improved through a cooling liquid direct injection mode after retarded shaping; S5, during cooling, hot steam in the rapid cooling box (210) enters the heat exchange condensing box (304) through the guide fan (303) and the exhaust fixing pipe (302) to be condensed and recovered, and then the pressing electric sliding rail (305) drives the pressing operation box (306) and the water absorbing sponge (307) to press, absorb water and dry the insulation layer on the outer side of the cable.
4. The method for preparing the insulating material of the high-voltage submarine cable according to claim 3, wherein the preparation method is realized through a preparation device, the preparation device comprises a fixed support frame (1) and a forming assembly (2), the side end of the fixed support frame (1) is provided with the forming assembly (2), the forming assembly (2) comprises an outer jacket forming die (201), the outer jacket forming die (201) is arranged on the inner side of the fixed support frame (1), a double-inlet multi-outlet pipe (202) is connected to the outer jacket forming die (201) through an adapter, electric heating relay boxes (203) are respectively arranged at the positions of the top end and the bottom end of the fixed support frame (1) corresponding to the positions of the double-inlet multi-outlet pipe (202), a plurality of feeding hydraulic cylinders (204) are arranged in the electric heating relay boxes (203), one end of each feeding hydraulic cylinder (204) is connected with a feeding pushing plate (205), two ends of each electric heating relay box (203) are connected with an injection operation pipe (206) in a penetrating manner, one end of each double-inlet multi-outlet multi-pipe (202) and one end of each injection operation pipe (206) is embedded with a limiting valve (207), one end of each multi-cavity (208) is connected with a plurality of cooling boxes (208) in a circulating way, one end (210) is connected with a plurality of cooling boxes (209), the quick cooling box (210) side end through-connection has spray pipe support (211), spray pipe support (211) one end is installed through the adapter and is sprayed header (212), extraction pump (213) are all installed through the motor cabinet to multicavity cooling box (208) and quick cooling box (210) bottom.
5. The method for preparing the insulating material of the high-voltage submarine cable according to claim 4, wherein one end of the double inlet and outlet pipe (202) is installed at one end of the electrothermal relay box (203) in a penetrating manner, and the feeding pushing plate (205) is installed inside the electrothermal relay box (203) in a sliding manner.
6. The method for preparing an insulating material for a high-voltage submarine cable according to claim 4, wherein the longitudinal section of the circulating communication pipe (209) is 匚, and one end of the circulating communication pipe (209) is connected with one end of the extraction pump (213) through an adapter.
7. The method for preparing the insulating material of the high-voltage submarine cable according to claim 4, wherein one end of the spray pipe rack (211) is connected with one end of the extraction pump (213) through an adapter, and input ends of the electric heating relay box (203), the feeding hydraulic cylinder (204), the limiting valve (207) and the extraction pump (213) are electrically connected with output ends of an external power supply.
8. The method for preparing the insulating material of the high-voltage submarine cable according to claim 7, wherein the preparing device further comprises a matching component (3), the matching component (3) is arranged at the side end of the multi-cavity cooling box (208), the matching component (3) comprises a low-temperature liquid storage box (301), the low-temperature liquid storage box (301) is arranged at the bottom end of the multi-cavity cooling box (208), a plurality of exhaust fixing pipes (302) are arranged at the top end of the quick cooling box (210), a diversion fan (303) is embedded in the inner side of each exhaust fixing pipe (302), a heat exchange condensing box (304) is arranged at the top end of the quick cooling box (210), a pressing operation box (306) is arranged at one end of each pressing operation box (305), and a water absorbing sponge (307) is sleeved on the inner side of each pressing operation box (306).
9. The method for preparing the insulating material of the high-voltage submarine cable according to claim 8, wherein the exhaust fixing pipe (302) is installed inside the heat exchange condensing box (304) in a penetrating mode, and input ends of the low-temperature liquid storage box (301), the guide fan (303) and the pressing electric sliding rail (305) are electrically connected with output ends of an external power supply.

Description

Insulating material of high-voltage submarine cable and preparation method thereof Technical Field The invention relates to the technical field of cable manufacturing, in particular to an insulating material of a high-voltage submarine cable and a preparation method thereof. Background The cable is an electric energy or signal transmission device, and is usually composed of a plurality of wires or a plurality of groups of wires, the ultra-high voltage submarine cable is a tip technology in the current high-voltage direct current transmission field, plays a core role in remote offshore wind power grid-connected engineering, the preparation of an insulating layer of the submarine cable is one of the most core and key links in the whole cable manufacture, and the electrical performance, long-term reliability and service life of the cable are directly determined by mainly adopting crosslinked polyethylene as a main flow insulating material. But when the cable insulation sleeve is prepared at present, the insulation sleeve is easy to generate uneven thickness or bubble holes in the continuous production process due to the influences of the hot melting speed and the feeding speed of an extruder, the insulation effect is greatly influenced, and micropores or cracks of the insulation sleeve are easy to generate due to overlarge change of thermal stress due to uneven cooling speed during cooling. Disclosure of Invention The invention provides an insulating material of a high-voltage submarine cable and a preparation method thereof, which can effectively solve the problems that when the existing cable insulating sleeve is prepared, the insulating sleeve is easy to generate uneven thickness or bubble holes in the continuous production process due to the influence of the hot melting speed and the feeding speed of an extruder, and micropores or cracks are generated due to overlarge change of thermal stress of the insulating sleeve due to uneven cooling speed in the cooling process. In order to achieve the above purpose, the present invention provides the following technical solutions: An insulating material of a high-voltage submarine cable comprises modified polyvinyl chloride resin, dioctyl phthalate, epoxidized soybean oil, a calcium-zinc composite heat stabilizer, spherical magnesium hydroxide filler, a polyether ester lubricating regulator, an antioxidant and an antistatic agent. Further, the insulating material comprises 60-70% of modified polyvinyl chloride resin, 10-15% of dioctyl phthalate, 6-10% of epoxidized soybean oil, 3-6% of calcium-zinc composite heat stabilizer, 6-10% of spherical magnesium hydroxide filler, 1.0-2.0% of polyether ester lubrication regulator and 1.0-2.0% of antioxidant and antistatic agent. The invention also provides a preparation method of the insulating material of the high-voltage submarine cable, which comprises the following steps: s1, when the cable outer protective insulating sleeve is produced, firstly, opening an injection operation pipe through a limiting valve, and injecting insulating materials into an electric heating relay box through the injection operation pipe by an external plastic extruding machine; s2, after filling is completed, penetrating a cable core into the inner side of an outer sheath shaping die, driving a feeding pushing plate by a feeding hydraulic cylinder to push insulating materials to enter the shaping die through a double-inlet multi-outlet pipe, fully sleeving the cable core and the outer sheath through multi-section feeding, and completing connection sealing and thickening sealing in multi-section lamination; S3, after the insulating sleeve is manufactured, cooling water in the low-temperature liquid storage tank is sprayed into the quick cooling tank by the pumping pump and the spray pipe rack for preliminary cooling, and then the cooling water is introduced into the multi-cavity cooling tank by the pumping pump and the circulating communication pipe, so that multi-cavity serial cooling in which the cooling water flows from bottom to top is realized; S4, in the process, the insulation sleeve is in contact with the cooling box to perform heat exchange, micropores or cracks caused by thermal stress and crystallinity mutation are avoided by adopting a retarded cooling mode, and cooling and forming speed is improved by adopting a cooling liquid direct injection mode after retarded shaping; s5, during cooling, hot steam in the rapid cooling box enters the heat exchange condensing box through the guide fan and the exhaust fixing pipe to be condensed and recovered, and then the pressing electric sliding rail drives the pressing operation box and the water absorbing sponge to press, absorb water and dry the insulating layer on the outer side of the cable. Further, the preparation method is realized through preparation facilities, preparation facilities includes fixed support frame, shaping subassembly, fixed support frame side is provided with shaping suba