CN210608492U

CN210608492U - Medium-voltage power cable terminal for high-temperature gas cooled reactor nuclear power station

Info

Publication number: CN210608492U
Application number: CN201921657554.3U
Authority: CN
Inventors: 王庆玖; 张军; 安阳
Original assignee: Jiangsu Huakan Nuclear Power Equipment Technology Co ltd
Current assignee: Jiangsu Huakan Nuclear Power Equipment Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-05-22
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a high temperature gas cooled reactor is middling pressure power cable terminal for nuclear power station, it includes looks colour tube, double-walled sealed tube, double-walled branch gloves, the binding post that links to each other with each looks cable conductor, is used for reinforcing the insulating double-walled insulating tube of cable, looks colour tube sets up in the sealed tube outside for the cable is other sign mutually, the double-walled sealed tube sets up in binding post tail pipe department and takes the lid with double-walled insulating tube upper end, the tip takes the lid with the finger pipe of double-walled branch gloves under the double-walled insulating tube. The utility model provides a high temperature gas cooled reactor nuclear power station is with middling pressure power cable terminal, it can be at conductor operating temperature 90 ℃, gamma ray cumulative irradiation dose 550kGy, service environment relative humidity possess under the operating mode of 100% have more than 60 years life, and have that insulating properties is good, the level is put to the part low, simple structure, simple to operate, the leakproofness is strong, the active service is longe-lived, stability is good, advantage such as the partial discharge volume is little.

Description

Medium-voltage power cable terminal for high-temperature gas cooled reactor nuclear power station

Technical Field

The utility model relates to a high temperature gas cooled reactor nuclear power station is with middling pressure power cable terminal belongs to nuclear power station cable accessories technical field.

Background

The terminal of the medium voltage cable power cable for the nuclear power station is arranged at the head end and the tail end of the medium voltage cable, so that the cable accessory for realizing the permanent connection and the re-insulation of the medium voltage cable and electrical equipment is an indispensable main auxiliary equipment for the nuclear power station. The cable accessory has harsh use environment and strict safety requirement, and is a cable accessory with high performance level requirement and large manufacturing technical difficulty. At present, the maximum gamma ray irradiation resistant dose of a medium-voltage cable accessory for a nuclear power station is only 275kGy, which is only half of the gamma ray irradiation of 550kGy required by a high-temperature gas-cooled reactor nuclear power station, and the use requirement of the high-temperature gas-cooled reactor nuclear power station cannot be met at all. In addition, the medium-voltage cable terminal used in the conventional nuclear power station is easy to have water inflow in long-term operation under the condition that the relative humidity of the use environment is 100%, so that faults are generated, the electrical insulation performance is rapidly reduced and the partial discharge capacity is increased under the combined action of long-term irradiation aging, thermal aging and electrical aging, and hidden troubles are brought to the normal operation of the whole system. Therefore, a medium-voltage cable terminal with performance indexes meeting the use requirement of the nuclear environment of the high-temperature gas-cooled reactor nuclear power station and stable and reliable electrical insulation performance is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem, overcome prior art not enough, a high temperature gas cooled reactor is middling pressure power cable terminal for nuclear power station is provided, it can be at conductor operating temperature 90 ℃, gamma ray cumulative irradiation dose 550kGy, service environment relative humidity is equipped with under the operating mode of 100% and has more than 60 years life, and have that insulating properties is good, the local level of putting is low, simple structure, simple to operate, the leakproofness is strong, the labour is longe-lived, good stability, local discharge capacity advantage such as little.

In order to solve the technical problem, the technical scheme of the utility model is that:

a medium-voltage power cable terminal for a high-temperature gas cooled reactor nuclear power station comprises a double-wall sealing pipe, double-wall branch gloves, a wiring terminal connected with each phase of cable conductor and a double-wall insulating pipe used for enhancing the insulation of the cable, wherein the double-wall sealing pipe is arranged at a tail pipe of the wiring terminal and is overlapped with the upper end of the double-wall insulating pipe, and the lower end of the double-wall insulating pipe is overlapped with a finger pipe of the double-wall branch gloves.

Further, the double-wall sealing pipe comprises a sealing pipe outer wall heat-shrinkable pipe and a sealing pipe inner wall hot melt adhesive.

Furthermore, a first hot melt adhesive tape is wound around the tail end of the terminal tail pipe and the gap of the cable insulation fracture.

Furthermore, a high-dielectric constant stress pipe is arranged at the insulation shielding fracture of each phase of cable, the high-dielectric constant stress pipe is respectively overlapped with the insulation shielding and the metal shielding at the lower end of the high-dielectric constant stress pipe, and the double-wall insulation pipe is arranged outside the cable insulation layer and the high-dielectric constant stress pipe.

Further, the double-wall insulating pipe comprises an insulating pipe outer wall heat-shrinkable pipe and an insulating pipe inner wall hot melt adhesive.

Furthermore, the first stress evacuation glue is positioned at the upper end part of the high-dielectric-constant stress pipe, so that the high-dielectric-constant stress pipe and the cable insulating layer form smooth transition.

And furthermore, a second stress evacuation glue is wound at the insulation shielding fracture of each phase of cable, and is respectively covered by 10-15 mm with the insulation shielding and the cable insulation layer of the cable to form smooth transition.

Further, a double-wall branch glove is arranged at the position of the fracture of the outer sheath of the cable, the double-wall branch glove comprises a finger tube and a tail tube, the finger tube of the double-wall branch glove is overlapped with the metal shield of each phase of cable, the tail tube of the double-wall branch glove is overlapped with the outer sheath of the cable, and the finger tube and the tail tube are both composed of a branch glove outer wall heat-shrinkable tube and a branch glove inner wall hot melt adhesive.

Further, the medium-voltage power cable terminal for the high-temperature gas cooled reactor nuclear power station comprises a grounding wire and a constant-force spring, the grounding wire is connected with a metal shield of the cable and is fixed on the metal shield of the cable through the constant-force spring, a grounding wire terminal is arranged at the tail end of the grounding wire, a double-wall heat-shrinkable sleeve is arranged outside the grounding wire, the lower end of the double-wall heat-shrinkable sleeve is lapped with a tail pipe of the grounding wire terminal, and second hot-melt adhesive tapes are wound at the fracture parts of the constant-force spring and a cable outer sheath.

Further, the double-wall heat-shrinkable tube comprises an outer-wall heat-shrinkable tube and an inner-wall hot melt adhesive.

After the technical scheme is adopted, the utility model discloses owing to improve key component insulating tube and branch gloves into double-walled structure, electric stress control adopts the stress tube to adopt high dielectric constant stress tube and stress evacuation cooperation to use, and the clearance position adopts hot melt adhesive tape to wind the package, and its profitable technological effect lies in:

1. the sealing tube, the insulating tube, the branch gloves and the heat-shrinkable sleeve of the utility model are all of double-wall structures; the heated hot melt adhesive fills gaps at the contact positions, overcomes the defect that a heat shrinkage component cannot seal small gaps, and can effectively prevent moisture and water from invading; the service life of the device is prolonged.

2. The double-wall insulating pipe of the utility model can discharge air after thermal contraction, and is tightly combined with the electric insulating layer, the high dielectric constant stress pipe and the finger pipe of the branch glove, and the hot melt adhesive on the inner wall can buffer mechanical strain; the problem of surface-extending flashover caused by a gap formed between the cable insulation and the heat-shrinkable sleeve due to expansion with heat and contraction with cold is solved, so that the faults of a power system are reduced, and the service life of the power system is prolonged.

3. The utility model discloses electric stress control adopts high dielectric constant stress tube and stress evacuation to glue the cooperation and use: stress evacuation glue is wrapped at the fracture of the insulation shield, so that a gap between the stress tube and the fracture of the insulation shield is filled, the heating and even breakdown of the fracture position caused by partial discharge caused by air gaps are effectively reduced, and the mechanical strain can be buffered; stress evacuation glue is wrapped at the upper end of the stress tube, so that a gap between the thermal shrinkage insulating tube and the fracture of the stress tube is filled, an electric field is homogenized in an auxiliary manner, partial discharge is effectively reduced, and the insulating tube and the stress tube are bonded more closely. The high dielectric constant stress tube is matched with the stress dispersion glue for application, so that the electric field distribution is more uniform, and the local discharge capacity is lower; the electric insulation performance is better, the electric aging damage is lower, and the service life of the terminal is further prolonged.

4. The utility model wraps the hot melt adhesive tape at the gap position between the wiring terminal and the insulation fracture, and the hot melt adhesive tape can seal the gap of the stranded conductor after being heated and melted, thereby enabling the double-wall insulation pipe to be tightly combined with the wiring terminal, the cable conductor and the cable insulation layer; wrapping a hot melt adhesive tape on the surface of the constant force spring and at the fracture of the cable outer sheath, wherein the hot melt adhesive tape is heated and melted to enable the cable outer sheath to be better sealed with the cable cores and the branch gloves; the upper end and the lower end of the cable terminal are completely sealed, the influence of the moist environment of a nuclear power plant is avoided, and the fault probability of a power system is greatly reduced.

5. The utility model discloses install double-walled heat shrinkage bush and cover earth connection terminal tail pipe outside the earth connection, effectively prevent moisture from copper woven ground wire gap and earth connection terminal and earth connection hookup location invasion, can avoid the moisture invasion to cause earth connection and cable copper shielding contact position oxidation simultaneously, cause the ground connection harmfully, reduce the through-flow capacity to cause the trouble.

In addition, the insulating pipe of the utility model adopts a double-wall structure, the bending performance of the terminal is better, and the insulating pipe can not be separated from the cable insulating layer after bending because the hot melt adhesive is used as a buffer layer; therefore, the terminal flashover and breakdown faults caused by bending of the installation are avoided, and the safety of the whole power system is ensured.

Drawings

Fig. 1 is a schematic structural view of a medium-voltage power cable terminal for a high-temperature gas cooled reactor nuclear power plant according to the present invention;

FIG. 2 is a schematic structural view of the double-wall sealing tube of the present invention;

FIG. 3 is a schematic structural view of a double-walled insulating pipe according to the present invention;

FIG. 4 is a schematic structural view of a double-walled branched glove of the present invention;

FIG. 5 is a schematic structural view of a double-walled heat shrinkable tube according to the present invention;

FIG. 6 is a perspective view of a double-walled glove of the present invention;

fig. 7 is an enlarged view of a portion a of fig. 1.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

As shown in fig. 1 to 7, a medium-voltage power cable terminal for a high-temperature gas cooled reactor nuclear power station comprises a double-wall sealing pipe 2, double-wall branch gloves 12, a connecting terminal 1 connected with each phase of cable conductor, and a double-wall insulating pipe 5 used for enhancing the insulation of the cable, wherein the double-wall sealing pipe 2 is sleeved at a tail pipe of the connecting terminal 1 and is overlapped with the upper end part of the double-wall insulating pipe 5, and the lower end part of the double-wall insulating pipe 5 is overlapped with finger pipes of the double-wall branch gloves 12. The cable in the embodiment is a three-phase cable, the wiring terminal 1 meets the requirement of GB/T14315 in size, and is made of copper T3 No. III No. GB/T5231, a sealed DTM type and tinning.

As shown in fig. 1 and 2, the double-wall sealing tube 2 comprises a sealing tube outer wall heat-shrinkable tube 2-1 and a sealing tube inner wall hot melt adhesive 2-2, the sealing tube outer wall heat-shrinkable tube 2-1 is a low-smoke halogen-free flame-retardant heat-shrinkable material, and the sealing tube inner wall hot melt adhesive 2-2 is a hot melt adhesive material with a softening point above 180 ℃.

As shown in fig. 1, a first hot melt adhesive tape 3 is wrapped around the tail end of the tail pipe of the connection terminal 1 and the gap between the tail pipe and the insulation fracture, and the first hot melt adhesive tape 3 is a hot melt adhesive tape with a softening point of more than 180 ℃.

As shown in fig. 1, a high-k stress tube 7 is sleeved at an insulation shielding fracture of each phase cable, the high-k stress tube 7 is respectively overlapped with an insulation shield 16 and a metal shield 17 of the cable at the lower end of the high-k stress tube 7, a double-wall insulation tube 5 is sleeved outside the cable insulation layer 17 and the high-k stress tube 7, and the high-k stress tube 7 is made of a thermal shrinkage stress material with a dielectric constant greater than 20. The high dielectric constant stress tube 7 is extruded into a tube shape by an extruder, is irradiated, crosslinked, expanded and shaped, cut according to different lengths, and finally heated and contracted to a corresponding position.

As shown in fig. 1 and 3, the double-walled insulating tube 5 comprises an insulating tube outer wall heat-shrinkable tube 5-1 and an insulating tube inner wall hot melt adhesive 5-2, the insulating tube outer wall heat-shrinkable tube 5-1 is a low-smoke halogen-free flame-retardant heat-shrinkable material, and the insulating tube inner wall hot melt adhesive 5-2 is a hot melt adhesive material with a softening point above 180 ℃.

As shown in fig. 1, the first stress evacuation glue 6 is located at the upper end of the high-k stress pipe 7, so that the high-k stress pipe 7 and the cable insulation layer 17 form a gradual transition.

As shown in fig. 1, a second stress dispersion glue 8 is wrapped around the insulation shielding fracture of each phase of cable, and covers 10-15 mm with the cable insulation shielding 16 and the cable insulation layer 17 respectively to form a smooth transition.

As shown in fig. 1 and 4, a double-wall branching glove 12 is sleeved at the fracture of the outer sheath of the cable, the double-wall branching glove 12 comprises a finger tube 12-3 and a tail tube 12-4, the finger tube 12-3 of the double-wall branching glove 12 is covered with a metal shield 15 of each phase of cable, and the tail tube 12-4 of the double-wall branching glove 12 is covered with the outer sheath of the cable. The finger tube 12-3 and the tail tube 12-4 are both composed of a branch glove outer wall heat shrinkable tube 12-1 and a branch glove inner wall hot melt adhesive 12-2, the outer wall 12-1 heat shrinkable branch glove is made of low smoke halogen-free flame retardant heat shrinkable material, the branch glove inner wall hot melt adhesive 12-2 is made of a hot melt adhesive material with a softening point above 180 ℃, the branch glove outer wall heat shrinkable tube 12-1 adopts an injection molding process, and is subjected to irradiation crosslinking, expansion and shaping, the branch glove inner wall hot melt adhesive 12-2 adopts a coating process, and finally is heated and shrunk to a corresponding part.

As shown in fig. 1 and 5, the cable comprises a ground wire, the ground wire is connected with a metal shield 15 of a three-phase cable, the ground wire 11 is fixed on the metal shield 15 of the cable by a constant force spring 10, a ground wire terminal 14 is arranged at the tail end of the ground wire 11, a double-wall heat-shrinkable tube 13 is arranged outside the ground wire 11, the lower end of the double-wall heat-shrinkable tube 13 is lapped with a tail pipe of the ground wire terminal 14, and second hot-melt adhesive tapes 9 are wound at the fracture parts of the constant force spring 10 and a cable outer sheath. The ground terminal 14 conforms to the requirement of GB/T14315 in size, is made of no less than GB/T5231 No. three copper T3, is in a sealed DTM type, and is plated with tin. The second hot melt adhesive tape 9 is a hot melt adhesive tape material with a softening point above 180 ℃, the double-wall heat-shrinkable tube 13 comprises an outer wall heat-shrinkable tube 13-1 and an inner wall hot melt adhesive 13-2, the outer wall heat-shrinkable tube 13-1 is a low-smoke halogen-free flame-retardant heat-shrinkable material, and the inner wall hot melt adhesive 13-2 is a hot melt adhesive material with a softening point above 180 ℃.

The first hot melt adhesive tape 3 and the second hot melt adhesive tape 9 are extruded into narrow strips by an extruder, are subjected to irradiation crosslinking, are cut according to different lengths, are wrapped on corresponding positions, and are finally heated and melted.

As shown in fig. 2, 3 and 5, the double-wall sealed pipe 2, the double-wall insulated pipe 5 and the double-wall heat-shrinkable tube 13 are all composed of an outer-wall heat-shrinkable tube and an inner-wall hot melt adhesive, the heat-shrinkable tube and the hot melt adhesive are extruded into a pipe shape by an extruder in a double-layer co-extrusion manner at one time, and the pipe shape is subjected to irradiation crosslinking, expansion setting, cutting according to different lengths and finally heating shrinkage to corresponding positions.

As shown in fig. 1, a phase color tube 4 is installed outside a double-wall sealing tube 2 and used as a phase identification of a three-phase cable, the phase color tube 4 is made of yellow, green and red low-smoke halogen-free flame-retardant heat-shrinkable material, the phase color tube 4 is extruded and molded by an extruder, is subjected to irradiation crosslinking, expansion molding, cutting according to different lengths, and is finally heated and shrunk to a corresponding position.

The above embodiments further describe the technical problems, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium-voltage power cable terminal for a high-temperature gas cooled reactor nuclear power station is characterized in that: the double-wall insulation cable comprises a double-wall sealing pipe (2), double-wall branch gloves (12), a wiring terminal (1) connected with each cable conductor and a double-wall insulation pipe (5) used for enhancing the insulation of the cable, wherein the double-wall sealing pipe (2) is arranged at a tail pipe of the wiring terminal (1) and is overlapped with the upper end part of the double-wall insulation pipe (5), and the lower end part of the double-wall insulation pipe (5) is overlapped with a finger pipe of the double-wall branch gloves (12).

2. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 1, wherein: the double-wall sealing pipe (2) comprises a sealing pipe outer wall heat-shrinkable pipe (2-1) and a sealing pipe inner wall hot melt adhesive (2-2).

3. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 1, wherein: and a first hot melt adhesive tape (3) is wound around the tail end of the tail pipe of the wiring terminal (1) and the gap position of the insulation fracture of the cable.

4. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 1, wherein: the cable comprises a high-dielectric constant stress pipe (7), wherein the high-dielectric constant stress pipe (7) is arranged at the fracture of an insulation shield (16) of each phase of cable, the high-dielectric constant stress pipe (7) is respectively overlapped with the insulation shield (16) and a metal shield (15) of the cable at the lower end of the high-dielectric constant stress pipe, and a double-wall insulation pipe (5) is arranged outside a cable insulation layer (17) and the high-dielectric constant stress pipe (7).

5. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 1, wherein: the double-wall insulating pipe (5) comprises an insulating pipe outer wall heat-shrinkable pipe (5-1) and an insulating pipe inner wall hot melt adhesive (5-2).

6. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 4, wherein: the upper end part of the high dielectric constant stress pipe (7) is provided with a first stress evacuating glue (6), so that the high dielectric constant stress pipe (7) and the cable insulation layer (17) form a smooth transition.

7. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 6, wherein: and the second stress evacuation glue (8) is wound at the fracture of the insulation shield (16) of the cable, and the second stress evacuation glue (8) is respectively covered with the insulation shield (16) of the cable and the cable insulation layer (17) to form smooth transition.

8. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 1, wherein: the double-wall branch gloves (12) are arranged at the fracture of the outer sheaths of the cables, the double-wall branch gloves (12) comprise finger tubes (12-3) and tail tubes (12-4), the finger tubes (12-3) of the double-wall branch gloves (12) are overlapped with metal shields (15) of the cables in each phase, the tail tubes (12-4) of the double-wall branch gloves (12) are overlapped with the outer sheaths of the cables, and the finger tubes (12-3) and the tail tubes (12-4) are both formed by branch glove outer wall heat shrink tubes (12-1) and branch glove inner wall hot melt adhesives (12-2).

9. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 8, wherein: including earth connection (11) and constant force spring (10), earth connection (11) are connected with the metallic shield (15) of each looks cable and fix earth connection (11) on metallic shield (15) of cable through constant force spring (10), the end of earth connection (11) is provided with earth connection terminal (14), earth connection (11) outside is provided with double-walled heat shrinkage bush (13), the lower extreme of double-walled heat shrinkage bush (13) and the tail pipe of earth connection terminal (14) overlap and cover, constant force spring (10) and cable jacket fracture department all around there is second hot melt adhesive tape (9).

10. The medium voltage power cable terminal for a high temperature gas cooled reactor nuclear power plant according to claim 9, wherein: the double-wall heat-shrinkable tube (13) comprises an outer wall heat-shrinkable tube (13-1) and an inner wall hot melt adhesive (13-2).