CN1667897A - On-site crosslinked polyethylene cable joint welding technique - Google Patents
On-site crosslinked polyethylene cable joint welding technique Download PDFInfo
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- CN1667897A CN1667897A CN 200510009749 CN200510009749A CN1667897A CN 1667897 A CN1667897 A CN 1667897A CN 200510009749 CN200510009749 CN 200510009749 CN 200510009749 A CN200510009749 A CN 200510009749A CN 1667897 A CN1667897 A CN 1667897A
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Abstract
This invention relates to a method for melting cross linked polyethylene cable connector using a voltage above 35KV, especially a method for melting it at site, characterizing in applying a heated cross linked polyethylene material same as a cable insulation bulk to heat it to a melt state above the softened temperature to let it enter into surroundings of an inner-semiconductor layer outside of a connected cable connector by two fixed cable connectors in a tube shaper from its side after pressing and melting it with the insulation bulk at the end of the cable end to cross link it and make a qualified cable connector. The temperature of the connector is 120-130deg.C when it enters into the shaper at the non-cross-linked melted state and its temperature is 180-250deg.Cwhen it is melted with the insulation bulk under the pressure above 2.0Mpa.
Description
Technical field: the present invention relates to crosslinked polyethylene cable joint welding, be specially the method for the crosslinked polyethylene cable joint welding of a kind of working voltage more than 35KV, particularly carry out crosslinked polyethylene cable joint welding technique at the scene.
Background technology: the wrapped method of the self-adhesive tape that the seventies Cross-Linked Polythene Cable Joints adopted, its shortcoming are that the gap between the belt causes electrical breakdown easily; The wrapped heating method of molding of the crosslinkable polyethylene belt of employing of the eighties exploitation, but the polyethylene belt is easy to dust suction, impurity is brought in the connector, easily causes defective, and bubble also is difficult to avoid in the joint.Countries in the world are adopted the integral prefabricated joints of big hole enlargement compacts more at present.After connected cable handling is good; on-the-spot hole enlargement; the prefabricated component hole enlargement is arrived above the cable cover(ing) diameter; be enclosed within on any one section cable; conductor is carried out crimping, in the middle of then prefabricated component being moved to, take out the hole enlargement cover; adjust prefabricated component to assigned position, handle insulation external shield and protecting sheathing and promptly finish the joint action.The processing of the cable semi-conductive layer that this joint is combined closely with it in installing is a crucial operation, need the on-the-spot human factor of installing more, it is neat inadequately that the semi-conductive layer fracture is handled, the slope is uniform and smooth inadequately, the semi-conductive adhesive of coating and the body of cable may not necessarily be tightened to one, are difficult to the control semiconductive particles and are not brought in the insulating joint; The convergent divergent channel of prefabricated expansion has a wedge angle slightly or has protruding particulate, will be with the joint squeeze crack when expansion; The length that cable jacket was broken when preparation joint was made does not reach the sealing and the mechanical level of cable body than long one times of other form joint when recovering.Day patent of the present disclosure, 1994 special opens flat 11-234838 and adopts that to extrude injection moulding be a kind of new method with cross-linking method manufacturing Cross-Linked Polythene Cable Joints, up to middle nineteen nineties.But because this joint fabrication cycle is long, three joints in a loop need be made one month, and the time is long, efficient is low, the wasting manpower and material resources, is difficult to apply.We have solved injection moulding and the long problem of crosslinked manufacturing cable joint fabrication cycle extruded.
Summary of the invention: the object of the present invention is to provide simple, with low cost, safe and reliable, easy to use, the crosslinked formula cable joint of the crosslinked polyethylene welding process at the scene of a kind of construction.The object of the present invention is achieved like this: it comprises oversheath (1), aluminium sheath (2), outer semiconducting layer (3), insulating body (4), cable conductor (5), tubulose former (6), interior semi-conductive layer (7), insulating body (8), dead ring (9), fastening bolt (10), pin (11), screw connector (12), T type half module (13), extruder (14), squeeze note machine (15).Be to adopt with cable insulation body (4) but the polythene material of identical heat cross-linking, be heated molten condition crosslinked more than the softening temperature, interior semi-conductive layer (7) through pressurization enters the cable conductor (5) that two cable ends being fixed in the tubulose former (6) have connected from tubulose former (6) side outside on every side, be welded together with the insulating body (4) of twisted polyethylene cable end, then under crosslinked temperature and pressure, carry out crosslinkedly, make qualified cable joint.It is to be in uncrosslinked molten condition when interior that crosslinked polyethylene cable joint welding material heating enters tubulose former (6), and its temperature is 120-130 ℃.Crosslinked polyethylene cable joint welding material heating enters tubulose former (6) and is not less than under the pressure of 2.0Mpa when interior.Crosslinking temperature after the insulating body of crosslinked polyethylene cable joint welding material melt and cable end (4) is welded together is 180-250 ℃.The manufacturing technology steps of crosslinked polyethylene cable joint welding comprises: the outer semiconducting layer (3) of two cable joint ends that will connect, insulating body (4), interior semi-conductive layer (7) and interior strip winding are peelled off certain-length, connect the cable conductor (5) that has exposed, interior strip winding and interior semi-conductive layer (7), handle and cleaning cable overhang insulation surface, tubulose former (6) is buckled in insulating body (4) goes up and clamp; Again plastics squeeze note machine (15) barrel is heated, drop into cable insulation body (4) but the cross-linked poly-ethylene cable material of identical heat cross-linking, and start squeeze note machine (15) is extruded, when the CABLE MATERIALS melt of extruding is continuous transparence, plastic extruding machine (15) temperature is controlled at 120 ℃ of constant temperature, the tubulose former (6) that clamps two cable ends treating welding is installed on the squeeze note machine (15), be heated to 120 ℃, still the uncrosslinked cross-linked poly-ethylene cable material that will be in molten condition is pressed in the tubulose former (6), when reaching 2.0Mpa, pressure carries out pressurize, after the CABLE MATERIALS of injecting has been full of, with the pressurization of tubulose former (6) and Dissolve things inside thereof and be heated to 180 ℃, constant temperature 2 hours is heated to 250 ℃ then, constant temperature 3 hours, 130C constant temperature 2 hours, is opened tubulose former (6) and is taken off to room temperature with nitrogen cooling tubulose former (6) and Dissolve things inside thereof, after suitable processing of the outside work of cable joint, repair cable outer semiconducting layer (3).The outer semiconducting layer of every cable socket (3) length is removed 80-200mm, and insulating body (4) removes 60-180mm, and interior semi-conductive layer (7) removes 40-160mm.Advantage of the present invention is: site operation is simple, with low cost, safe and reliable, it is simple and convenient to manipulate equipment, time is short, the efficient height, it is above to 500kV power cable with cross-linked polyethylene insulation and annex to meet GB/T11017-2002＜rated voltage 110kV〉and extrude insulated power cable and annex to 150kV (Um=170kV) more than IEC60840:1999＜rated voltage 30kV (Um=36kV)〉test method and requirement, IEC62067:2001＜rated voltage 150kV (Um=170kV) is above to extrude insulated power cable and annex test method and requirement to 500kV (Um=550kV)〉requirement.
Description of drawings: Fig. 1 is a structural principle schematic diagram of the present invention; Fig. 2 is a tubulose former structural principle schematic diagram of the present invention; Fig. 3 is a tubulose former cross-section structure principle schematic of the present invention; Fig. 4 is tubulose former of the present invention, extruder, squeeze note machine square frame principle schematic diagram.Oversheath-be cross-linking polyethylene materials, outer semiconducting layer, interior semi-conductive layer-be crosslinked polyethylene and the synthetic material of toner mixture, insulating body--cross-linking polyethylene materials goods.
Embodiment: at first two T type half modules (13) are buckled on the insulating body, adjustment dead ring (9), fastening bolt (10), pin (11), screw connector (12) reach the suitable state of degree of tightness.Be squeezed in the squeeze note machine (15) after the crosslinked polyethylene raw material fusing in the extruder (14), the still uncrosslinked cross-linked poly-ethylene cable material that the squeeze note machine will be in molten condition is pressed in the tubulose former (6).Adopt with cable insulation body (4) but the polythene material of identical heat cross-linking, be heated molten condition crosslinked more than the softening temperature, interior semi-conductive layer (7) through pressurization enters the cable conductor (5) that two cable ends being fixed in the tubulose former (6) have connected from tubulose former (6) side outside on every side, be welded together with the insulating body (4) of twisted polyethylene cable end, then under crosslinked temperature and pressure, carry out crosslinkedly, make qualified cable joint.It is to be in uncrosslinked molten condition when interior that crosslinked polyethylene cable joint welding material heating enters tubulose former (6), and its temperature is 120-130 ℃.Crosslinked polyethylene cable joint welding material heating enters tubulose former (6) and is not less than under the pressure of 2.0Mpa when interior.Crosslinking temperature after the insulating body of crosslinked polyethylene cable joint welding material melt and cable end (4) is welded together is 180-250 ℃.The manufacturing technology steps of crosslinked polyethylene cable joint welding comprises: the outer semiconducting layer (3) of two cable joint ends that will connect, insulating body (4), interior semi-conductive layer (7) and interior strip winding are peelled off certain-length, connect the cable conductor (5) that has exposed, interior strip winding and interior semi-conductive layer (7), handle and cleaning cable overhang insulation surface, tubulose former (6) is buckled in insulating body (4) goes up and clamp; Again plastics squeeze note machine (15) barrel is heated, drop into cable insulation body (4) but the cross-linked poly-ethylene cable material of identical heat cross-linking, and start squeeze note machine (15) is extruded, when the CABLE MATERIALS melt of extruding is continuous transparence, squeeze note machine (15) temperature is controlled at 120 ℃ of constant temperature, the tubulose former (6) that clamps two cable ends treating welding is installed on the squeeze note machine (15), be heated to 120 ℃, still the uncrosslinked cross-linked poly-ethylene cable material that will be in molten condition is pressed in the tubulose former (6), when reaching 2.0Mpa, pressure carries out pressurize, after the CABLE MATERIALS of injecting has been full of, with the pressurization of tubulose former (6) and Dissolve things inside thereof and be heated to 180 ℃, constant temperature 2 hours is heated to 250 ℃ then, constant temperature 3 hours, 130 ℃ of constant temperature 2 hours, is opened tubulose former (6) and is taken off to room temperature with nitrogen cooling tubulose former (6) and Dissolve things inside thereof, after suitable processing of the outside work of cable joint, repair cable outer semiconducting layer (3).The outer semiconducting layer of every cable socket (3) length is removed 80-200mm, and insulating body (4) removes 60-180mm, and interior semi-conductive layer (7) removes 40-160mm.Embodiment: at first, the termination of two high-pressure cross-linking cables that processing will connect, it is long to peel the outer semiconducting layer of each root cable end off 120mm, and insulating barrier is peeled 100mm off, and interior semi-conductive layer and interior strip winding remove 80mm; Connect the conductor that has exposed, interior strip winding and semi-conductive layer, careful cleaning cable overhang insulation surface.Then, 400mm is long tubulose former is anchored on this section cable and clamping; Simultaneously, the plastic extruder barrel is heated, when hopper to each section of plastic extruding machine temperature is respectively 70 ℃, 90 ℃, 100 ℃, 110 ℃, in the time of 130 ℃, but drops into the cross-linked poly-ethylene cable material of the heat cross-linking identical, and start shooting and extrude with the cable insulation body.When the CABLE MATERIALS melt of extruding is transparence, squeeze note machine head temperature is controlled at 120 ℃ of constant temperature; Then, the tubulose former that clamps two cable ends treating welding is installed on the squeeze note machine head, is heated to 120 ℃, and vacuumizes; Then, the still uncrosslinked cross-linked poly-ethylene cable material that will be in molten condition is pressed in the former in the middle of the cable socket, with machinery melt is exerted pressure, and with pressure automatic control equipment controlled pressure and time, maintenance is two minutes when pressure reaches 2.0Mpa; After the CABLE MATERIALS of injecting with X-ray examination has been full of, tubulose former and content thereof are heated to 180 ℃, constant temperature 2 hours, are heated to 250 ℃ then, 3 hours, 130 ℃ constant temperature of constant temperature 2 hours; , to room temperature, open the tubulose former and take out stube cable with nitrogen cooling tubulose former and content thereof.At last, repair the cable outer semiconducting layer; Just made the crosslinked formula cable joint of 110kV.Crosslinked polyethylene cable joint welding is to adopt and the cable insulation same material, is extruded in the conductor joint at the construction field (site), carries out crosslinked making it then and forms one, this mode reliable in quality and compact conformation with the crosslinked polyetylene insulated structure of cable.For preventing adhering to and sneaking into of impurity, the extruded insulation material need pack, and each used mould and pipe arrangement need clean and seal keeping; Use program control temperature equipment, pressure automatic control equipment control crosslinked temperature, pressure, time of welding.
Claims (6)
1, a kind of on-site crosslinked polyethylene cable joint welding technique, it comprises oversheath (1), aluminium sheath (2), outer semiconducting layer (3), insulating body (4), cable conductor (5), tubulose former (6), interior semi-conductive layer (7), insulating body (8), dead ring (9), fastening bolt (10), pin (11), screw connector (12), T type half module (13), extruder (14), squeeze note machine (15), it is characterized in that: be to adopt with cable insulation body (4) but the polythene material of identical heat cross-linking, be heated molten condition crosslinked more than the softening temperature, interior semi-conductive layer (7) through pressurization enters the cable conductor (5) that two cable ends being fixed in the tubulose former (6) have connected from tubulose former (6) side outside on every side, be welded together with the insulating body (4) of twisted polyethylene cable end, then under crosslinked temperature and pressure, carry out crosslinkedly, make qualified cable joint.
2, on-site crosslinked polyethylene cable joint welding technique according to claim 1, it is characterized in that: it is to be in uncrosslinked molten condition when interior that crosslinked polyethylene cable joint welding material heating enters tubulose former (6), and its temperature is 120-130 ℃.
3, on-site crosslinked polyethylene cable joint welding technique according to claim 1 is characterized in that: crosslinked polyethylene cable joint welding material heating enters tubulose former (6) and is not less than under the pressure of 2.0Mpa when interior.
4, on-site crosslinked polyethylene cable joint welding technique according to claim 1 is characterized in that: the crosslinking temperature after the insulating body of crosslinked polyethylene cable joint welding material melt and cable end (4) is welded together is 180-250 ℃.
5, on-site crosslinked polyethylene cable joint welding technique according to claim 1, it is characterized in that: the manufacturing technology steps of crosslinked polyethylene cable joint welding comprises: the outer semiconducting layer (3) of two cable joint ends that will connect, insulating body (4), interior semi-conductive layer (7) and interior strip winding are peelled off certain-length, connect the cable conductor (5) that has exposed, interior strip winding and interior semi-conductive layer (7), handle and cleaning cable overhang insulation surface, tubulose former (6) is buckled in insulating body (4) goes up and clamp; Again plastics squeeze note machine (15) barrel is heated, drop into cable insulation body (4) but the cross-linked poly-ethylene cable material of identical heat cross-linking, and start squeeze note machine (15) is extruded, when the CABLE MATERIALS melt of extruding is continuous transparence, squeeze note machine (15) temperature is controlled at 120 ℃ of constant temperature, the tubulose former (6) that clamps two cable ends treating welding is installed on the squeeze note machine (15), be heated to 120 ℃, still the uncrosslinked cross-linked poly-ethylene cable material that will be in molten condition is pressed in the tubulose former (6), when reaching 2.0Mpa, pressure carries out pressurize, after the CABLE MATERIALS of injecting has been full of, with the pressurization of tubulose former (6) and Dissolve things inside thereof and be heated to 180 ℃, constant temperature 2 hours is heated to 250 ℃ then, constant temperature 3 hours, 130 ℃ of constant temperature 2 hours, is opened tubulose former (6) and is taken off to room temperature with nitrogen cooling tubulose former (6) and Dissolve things inside thereof, after suitable processing of the outside work of cable joint, repair cable outer semiconducting layer (3).
6, on-site crosslinked polyethylene cable joint welding technique according to claim 5, it is characterized in that: the outer semiconducting layer of every cable socket (3) length is removed 80-200mm, insulating body (4) removes 60-180mm, and interior semi-conductive layer (7) removes 40-160mm.
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| CNB2005100097493A CN100424948C (en) | 2005-02-18 | 2005-02-18 | On-site crosslinked polyethylene cable joint welding technique |
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| CNB2005100097493A CN100424948C (en) | 2005-02-18 | 2005-02-18 | On-site crosslinked polyethylene cable joint welding technique |
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