Utility model content
The purpose of this utility model is intended to solve at least one aspect of the above-mentioned problems in the prior art and defect.
An object of the present utility model is to provide a kind of can be arranged on cold-contraction type terminal the cold-contraction type terminal assembly on power cable fast and easily.
Another object of the present utility model is to provide a kind of burden that can reduce staff, simplifies the cold-contraction type terminal assembly of the installation steps of cold-contraction type terminal.
According to an aspect of the present utility model, it provides a kind of cold-contraction type terminal assembly, comprising: a stay pipe, and coated soft material on one section of outer wall of this stay pipe, described soft material comprises gel or clay; With a cold-contraction type terminal, the insulating body of this cold-contraction type terminal is expanded on the stay pipe that is coated with soft material in advance.
In above-mentioned cold-contraction type terminal assembly, the hardness of the described gel being recorded by structural analysis instrument is less than or equal to 500 grams.
In above-mentioned cold-contraction type terminal assembly, the hardness of described gel is 60-150 gram.
In above-mentioned cold-contraction type terminal assembly, the plasiticity index of the described clay recording 70 ℃ time according to GB/T 12828-2006 standard is less than 500.
In above-mentioned cold-contraction type terminal assembly, described cold-contraction type terminal is used for being arranged on power cable, after the described stay pipe of dismounting, described soft material be filled between described cold-contraction type terminal and the cable joint of described power cable as one of upper/lower positions:
(1) part of described power cable conductive shielding layer and whole internal insulating layer of strip off of strip off;
(2) part of described power cable conductive shielding layer, the part step place of the built-in electrical insulation interval of strip off and the conductive shielding layer of strip off of strip off; And
(3) near the part of conductive shielding layer of described power cable or the internal insulating layer of whole strip ofves of described power cable.
In above-mentioned cold-contraction type terminal assembly, described stay pipe comprises straight tube or special pipe.
In above-mentioned cold-contraction type terminal assembly, described cold-contraction type terminal also comprises the Stress Control cone of the inside that is arranged on described insulating body, described Stress Control cone and the described insulating body part that forms as one.
In above-mentioned cold-contraction type terminal assembly, also comprise a metal connecting terminal, this metal connecting terminal is inserted described stay pipe from boring relative one end with described Stress Control, and is electrically connected with the conductor cores of exposing of power cable.
In above-mentioned cold-contraction type terminal assembly, described soft material is coated at least a portion metal connecting terminal.
In above-mentioned cold-contraction type terminal assembly, the thickness of described gel is 0.5-1.5 millimeter.
According to cold-contraction type terminal assembly of the present utility model, by layer of gel is coated on stay pipe in advance, or soft material is coated on stay pipe, and the insulating body of cold-contraction type terminal is expanded on this stay pipe in advance, therefore, on the cable joint that cold-contraction type terminal need to be arranged on to power cable time, directly the cable joint of power cable is inserted to the inside of stay pipe, then remove stay pipe, and need on the cable joint at power cable, not apply in erecting bed one deck grease, therefore, the installation steps of erecting bed are simplified, improve the installation effectiveness of cold-contraction type terminal, can realize installing fast and easily of cold-contraction type terminal.
By the description of hereinafter with reference to accompanying drawing, the utility model being done, other object of the present utility model and advantage will be apparent, and can help that the utility model is had to comprehensive understanding.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.In specification, same or analogous drawing reference numeral is indicated same or analogous parts.Followingly with reference to accompanying drawing, the explanation of the utility model execution mode is intended to overall utility model design of the present utility model to make an explanation, and does not should be understood to a kind of restriction of the present utility model.
According to design generally of the present utility model, provide a kind of cold-contraction type terminal assembly being applied on power cable.As shown in Figure 2, this power cable comprises that to be positioned at the cable of its one end concrete 200, and cable joint 200 comprises conductor cores 210, be wrapped in internal insulating layer 220 in conductor cores 210, be wrapped in the conductive shielding layer 230 on internal insulating layer 220 and be wrapped in the outer protective jacket layer 240 on conductive shielding layer 230.Therefore, before stube cable joint 200, must first remove one section of outer protective jacket layer 240 of power cable in one end of power cable to be connected, to expose one section of conductive shielding layer 230, and then a part for the conductive shielding layer exposing 230 is removed, to expose an intersegmental part insulating barrier 220, last again by the part removal of the internal insulating layer exposing 220, to expose one section of conductor cores 210, thereby form cable joint to be connected 200.In an embodiment of the present utility model, power cable can be the power cable for transmitting the following voltage of 110kV, for example, and the power cable of 35kV power cable, 10kV power cable or other voltage.
Fig. 3 be illustrate according to an embodiment of the present utility model for being arranged on the schematic diagram of the cold-contraction type terminal 100 on cable joint 200.This cold-contraction type terminal 100 mainly comprises the insulating body 110 of tubular.Be provided with Stress Control cone 120 in the inside of insulating body 110, for preventing from occurring on the joint of power cable that electric field concentrates and discharge breakdown phenomenon.In a preferred embodiment of the present utility model, Stress Control cone 120 can be formed as an integral piece with insulating body 110.More specifically, Stress Control cone 120 can be made up of semiconductive silastic material.Insulating body 110 can be made up of electric insulation silastic material.Like this, can bore 120 by the method insulating body 110 of mold pressing and Stress Control can be integrally molded well.
Form multiple outstanding cluster parachutes 111 outwardly in the outside of insulating body 110, for increasing the creepage distance of cold-contraction type terminal 100.
As shown in Figure 5, according to cold-contraction type terminal assembly of the present utility model, comprising: a stay pipe 400, coated soft material 300 on one section of outer wall of this stay pipe 400, described soft material 300 comprises gel or clay; With a cold-contraction type terminal 100, the insulating body 110 of this cold-contraction type terminal 100 is expanded on the stay pipe 400 that is coated with soft material in advance.
Fig. 4 is the schematic diagram that applies or wrap up in advance the stay pipe 400 of one deck soft material 300 illustrating according to an embodiment of the present utility model.On the one section outer wall corresponding with cable joint 200 (referring to Fig. 4) of stay pipe 400, apply one deck soft material 300.The thickness of soft material 300 is different and different according to the size of cable joint.
According to a kind of exemplary embodiment of the present utility model, soft material 300 is thickness liquid-state silicon gel before uncrosslinked, has certain viscosity, cross-linking reaction after being coated to the 400 upper scheduled times of stay pipe.Further, the mixed silicone oil that has catalyst, crosslinking agent, under the condition of room temperature, this silicone oil can become gel by cross-linking reaction.
Liquid-state silicon gel comprises the two end-blocking silicone oil of vinyl, side chain containing hydrogen silicone oil and platinum-vinyl siloxane complex (for example Karsted catalyst).
In the interchangeable embodiment of one of the present utility model, gel can be made to gel film or gel band in advance, and be wound around gel film or gel band on one section of outer wall of stay pipe 400.
In a kind of exemplary embodiment, in the situation that soft material comprises gel, by the measuring instrument of the hardness for measuring flexible material, for example structural analysis instrument, the hardness that records gel is less than or equal to 500 grams, is preferably 60-150 gram.The thickness that is coated on the gel 3 on stay pipe 400 is less than 3 millimeters, is preferably 0.5-1.5 millimeter.When soft material comprises in the situation of clay, in step S100, the plasiticity index of the clay recording 70 ℃ time according to GB/T 12828-2006 standard is less than 500.
In the utility model, the plasiticity index of clay is to record under the environment of 70 ℃ according to GB/T 12828-2006 standard.GB/T 12828-2006 standard refers to " rubber and do not vulcanize the mensuration parallel plate method of elastomeric compound plasiticity index and the disengaging value " standard that is distributed and implement on June 1st, 2007 on December 29th, 2006 by General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and Standardization Administration of China.
Further, in the utility model, the hardness of gel (Valand hardness) is measured by structural analysis instrument or similar instrument.Instrument comprises the dynamometer of five kilograms for ergometry, the pallet of 5 grams and diameter 1/4 " stainless steel measuring head (6.35mm).In the time measuring the hardness of gel, measuring head is depressed into the degree of depth that reaches 4.0mm in gel with the speed of 0.2mm per second.The Voland hardness of gel is exactly the power in grams of being got off by a computer recording, and this power is for to be pressed into gel surface by measuring head with above-mentioned speed, or makes this gel surface distortion 4.0mm needed.The higher expression gel of numeral is harder.
In the liquid-state silicon gel of the first exemplary embodiment, the two end-blocking silicon oil viscosities of vinyl are 100Pa.s, and content is 100 weight portions; The content of side chain containing hydrogen silicone oil is 1.88 weight portions, and the hydrogeneous weight content of side chain in side chain containing hydrogen silicone oil is 0.11%; And the content of platinum-vinyl siloxane complex is 20ppm weight portion.
In the liquid-state silicon gel of the second exemplary embodiment, the two end-blocking silicon oil viscosities of vinyl are 100Pa.s, and content is 100 weight portions; The content of side chain containing hydrogen silicone oil is 1.06 weight portions, and the hydrogeneous weight content of side chain in side chain containing hydrogen silicone oil is 0.2%; And the content of platinum-vinyl siloxane complex is 20ppm weight portion.
In the liquid-state silicon gel of the third exemplary embodiment, the content of the two end-blocking silicone oil of vinyl that viscosity is 100Pa.s is 50 weight portions; Viscosity is that the content of the two end-blocking silicone oil of vinyl of 10Pa.s is 50 weight portions; The content of side chain containing hydrogen silicone oil is 3 weight portions, and the hydrogeneous weight content of side chain in side chain containing hydrogen silicone oil is 0.11%; And the content of platinum-vinyl siloxane complex is 20ppm weight portion.
In the liquid-state silicon gel of the 4th kind of exemplary embodiment, the content of the two end-blocking silicone oil of vinyl that viscosity is 10Pa.s is 100 weight portions; The content of side chain containing hydrogen silicone oil is 2.20 weight portions, and the hydrogeneous weight content of side chain in side chain containing hydrogen silicone oil is 0.11%; And the content of platinum-vinyl siloxane complex is 20ppm weight portion.
Fig. 5 is the schematic diagram that the cold-contraction type terminal assembly of the present utility model cold-contraction type terminal 100 shown in Fig. 3 being expanded on the stay pipe that has one deck soft material 300 400 shown in Fig. 4 in advance and form is shown.Can cold-contraction type terminal 100 be expanded on the stay pipe 400 of one deck soft material 300 in advance in factory, thereby obtain cold-contraction type terminal assembly of the present utility model.The relative position of cold-contraction type terminal 100 and soft material 300 is relative fixing in the time of expansion.Therefore, when on the cable joint 200 that cold-contraction type terminal 100 need to be arranged on to power cable, just can directly cable joint 200 be inserted to the inside of the stay pipe 400 of cold-contraction type terminal assembly, then remove stay pipe 400, and need on cable joint 200, not apply in erecting bed layer of gel or the lubricating grease that insulate, therefore, the installation steps of erecting bed are simplified, improve the installation effectiveness of cold-contraction type terminal, can realize installing fast and easily of cold-contraction type terminal, and promote the electric property of cold-contraction type terminal assembly.
With respect in prior art by prefabricated the grease of the certain viscosity cold-contraction type terminal assembly in shrinkage product, cold-contraction type terminal assembly of the present utility model uses gel or clay, due to gel or clay storage life longer, the useful life of cold-contraction type terminal assembly of the present utility model and reliability are significantly improved.Further, gel can also be served as the marine glue between cold-contraction type terminal and metal connection, prevents that steam from entering cable.Therefore, in the assembling process of cold-contraction type terminal assembly of the present utility model, need to be between metal wiring terminal and cold-contraction type terminal lute in, thereby simplified number of assembling steps.
Fig. 6 is that cold-contraction type terminal 100 is arranged on the schematic diagram on cable joint by the stay pipe 400 that the cold-contraction type terminal assembly by Fig. 5 is shown.Cable joint 200 is inserted cold-contraction type terminal assembly stay pipe 400 inside and remove stay pipe 400 after, just cold-contraction type terminal 100 can be arranged on cable joint 200 easily.
According to exemplary embodiment of the present utility model, after the described stay pipe 400 of dismounting, gel-filled between described cold-contraction type terminal 100 and described cable joint 200 as one of upper/lower positions:
(1) part conductive shielding layer 230 and whole internal insulating layer 220 of strip off of strip off;
(2) part conductive shielding layer 230, part on the internal insulating layer 220 of strip off and the step place of the conductive shielding layer 230 of strip off of strip off; And
(3) internal insulating layer 220 of the some or all of strip off of close conductive shielding layer 230.
As shown in Figure 4, stay pipe 400 can be the straight tube of general cylindrical shape.In interchangeable embodiment, stay pipe can be special pipe, for example, have the reducing stay pipe of different-diameter.In a kind of exemplary embodiment, stay pipe comprises the Part I with the first overall diameter and the Part II with the second overall diameter, and the second overall diameter is more than or equal to the first overall diameter.
In a kind of exemplary embodiment, the internal insulating layer 220 of power cable is made up of rubber or crosslinked polyethylene.Conductive shielding layer 230 can be metallic conduction screen, for example, and any existing conductive shielding layers such as copper wire conductive shielding layer, copper strips conductive shielding layer, aluminium armor screen.
As shown in Figure 6, in an embodiment of the present utility model, cold-contraction type terminal 100 can also comprise a metal connecting terminal 500, when mounted, stay pipe 400 is inserted from one end relative with cable joint 200 in one end of this metal connecting terminal 500, and is electrically connected with the conductor cores of exposing 210 of cable joint 200.Preferably, between metal connecting terminal 500 and the conductor cores 210 of cable joint 200, can mutually be electrically connected by crimping or bolted mode.Metal connecting terminal 500 is sealed and matched with the insulating body 110 of described cold-contraction type terminal 100.After the described stay pipe 400 of dismounting, comprise the coated at least a portion metal wiring terminal of soft material of gel layer or sheet rubber.
Describe in detail cold-contraction type terminal 100 is arranged on to the method on the cable joint 200 of power cable below in conjunction with accompanying drawing 2-6, the method mainly comprises the following steps:
S100 a: stay pipe 400 is provided, and is coated one deck soft material 300 (as shown in Figure 4) on one section of outer wall of this stay pipe 400;
S200: the insulating body of cold-contraction type terminal 100 110 is expanded in advance on the stay pipe 400 that is coated with one deck soft material 300 (as shown in Figure 5);
S300: the inside (not shown) of the joint of a part of removing of the cable joint of power cable 200 conductive shielding layer 230 and a part of internal insulating layer 220 being inserted to stay pipe 400; With
S400: dismounting stay pipe 400, cold-contraction type terminal 100 is contracted on the joint of power cable 200, thereby soft material 300 is filled in the space between cold-contraction type terminal 100 and the cable joint of power cable, on the cable joint 200 of power cable, occurs partial discharge (as shown in Figure 6) to prevent.In the interchangeable embodiment of one of step S100 of the present utility model, gel can be made to gel film or gel band in advance, and be wound around gel film or gel band on one section of outer wall of stay pipe 400.
In the situation that soft material comprises gel, by the measuring instrument of the hardness for measuring flexible material, for example structural analysis instrument, the hardness that records gel is less than or equal to 500 grams, is preferably 60-150 gram.The thickness that is coated on the gel 3 on stay pipe 400 is less than 3 millimeters, is preferably 0.5-1.5 millimeter.When soft material comprises in the situation of clay, in step S100, the plasiticity index of the clay recording 70 ℃ time according to GB/T 12828-2006 standard is less than 500.
In the time that cold-contraction type terminal 100 comprises metal connecting terminal 500, between step S300 and step S400, also comprise step:
S310 a: metal connecting terminal 500 is provided, and stay pipe 400 is inserted from one end relative with cable joint 200 in one end of this metal connecting terminal 500, and is electrically connected with the conductor cores of exposing 210 of cable concrete 200.Between the conductor cores 210 of metal connecting terminal 500 and cable joint 200, be mutually electrically connected by crimping or bolted mode.Soft material is coated at least a portion metal wiring terminal.
In one embodiment, metal connecting terminal 500 is sealed and matched with the insulating body 110 of cold-contraction type terminal 100.As shown in Figure 7, fluid sealant 600 is arranged in advance to one end of stay pipe 400, cold-contraction type terminal 100 is expanded on the stay pipe 400 with fluid sealant 600 again, in process of expansion, should notes one end that has fluid sealant 600 of stay pipe 400 to be placed on one end relative with cable joint 200.
As shown in Figure 7, after progressively pulling out stay pipe 400, the fluid sealant 600 being squeezed on the inwall of upper end of insulating body 110 will be compressed on the internal insulating layer 220 of cable joint 200 with the retraction of insulating body 110, thereby the upper end of cold-contraction type terminal is wrapped in hermetically on the internal insulating layer 220 of power cable, thereby can effectively prevents that rainwater and moisture from entering cold-contraction type terminal 100 from the upper end of insulating body 110.
It will be appreciated by those skilled in the art that, embodiment described above is exemplary, and those skilled in the art can make improvements, structure described in various embodiment can be carried out independent assortment in the case of the conflict aspect not recurring structure or principle, thereby solving on the basis of technical problem of the present utility model, realizing more kinds of cold-contraction type terminal being arranged on to method and the cold-contraction type terminal assembly on power cable.
Although some embodiment of this overall utility model design are shown and explanation, those skilled in the art will appreciate that, in the case of not deviating from the principle and spirit of this overall utility model design, can make a change these embodiment, scope of the present utility model limits with claim and their equivalent.
It should be noted that word " comprises " does not get rid of other element or step, and word " " or " one " do not get rid of multiple.In addition, any element numbers of claim should not be construed as restriction scope of the present utility model.