CN101459329B - Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method - Google Patents
Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method Download PDFInfo
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- CN101459329B CN101459329B CN2007101721962A CN200710172196A CN101459329B CN 101459329 B CN101459329 B CN 101459329B CN 2007101721962 A CN2007101721962 A CN 2007101721962A CN 200710172196 A CN200710172196 A CN 200710172196A CN 101459329 B CN101459329 B CN 101459329B
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Abstract
The invention relates to an intermediate connector of an optical fiber composite high-voltage cable, which comprises a conductor connecting member, an insulating and stress balancing unit and a metal outer case, wherein the conductor connecting member is a pipe with one longitudinal H-shaped section, the middle part of the pipe is equipped with a partition board, two sides of the partition board are cavities communicated with the outside, two conductor ends of the high-voltage cable can be respectively disposed in the cavities on the two sides of the partition board inside the conductor connecting member, the outside of the conductor connecting member is sequentially connected with the insulating and stress balancing unit and the metal outer case, and the partition board is equipped with at least one passage contained in the high-voltage cable conductor for penetrating with an optical cable. The intermediate connector realizes electrical and optical connection of the optical fiber composite high-voltage electric cable.
Description
Technical field
The present invention relates to cable and connect, particularly relate to a kind of transition joint of the high-tension cable that is compounded with optical fiber and utilize it to connect two methods that contain the high-tension cable of optical cable.
Background technology
For guaranteeing the safe operation of high pressure underground cable system, power department need carry out on-line monitoring to it.The main contents of on-line monitoring comprise load monitoring and two aspects of malfunction monitoring.
The operating temperature limit that the constraints of cable load-bearing capacity mainly allows from cable and electric cable accessories manufactured materials.For example, for XLPE cable, the temperature of cable conductor, the temperature of the XLPE of adjacent conductors just, regulation can not be above 85 ℃ or 90 ℃ usually.When cable and cable system design, mainly limit and accomplish the load-bearing capacity design according to conductor temperature.The load-bearing capacity of cable system is usually according to IEC60287 and IEC853 standard design.These standards hypothesis load currents are constant or basically according to a daily load curve modal shift, and the hypothesis ambient environmental conditions is confirmed.For guaranteeing design safety, the condition of being supposed is often got extreme case, causes the possibility that the load of cable system actual motion is low, assets utilization is not enough.In fact, because cable electric influence each other and thermal conduction study the complex nature of the problem, above-mentioned standard can not provide reliably and accurately and separate for the cable of (particularly multiloop) that lays in the environment of more complicated.Cable temperature is carried out online detection, an approach that addresses this problem is provided, conductor temperature is very important, can be directly as the key index of load monitoring.
Utilize distributed fiber temperature sensing (Distributed Temperature Sensor is abbreviated as DTS) technology, can detect a Temperature Distribution that reaches several kms to tens km optical fiber, the sampled point distance can reach 1 to 2 meter.This thermometric optical fiber is axial arranged along cable, and the axial temperature that then can obtain cable distributes.Because the conductor of high-tension cable is in high-voltage potential, the insulating barrier of not allowed to destroy by integrality wraps up, and can't utilize the DTS technology directly to measure conductor temperature.The method of measuring conductor temperature in the reality has common two kinds:
1, external: this method is that the optical cable that holds thermometric optical fiber is arranged in cable surface.For cable in the cable tunnel and the direct-buried cable before the backfill earthwork, can with colligation or bonding method optical cable be fixed on cable surface by manual pick.But for the cable that the comb mode is laid, optical cable draws in the comb usually after cable pipe finishes again.At this moment, optical cable unlikely closely contacts cable surface in above-mentioned situation, and the part optical cable possibly contact cable surface, and part then possibly not touch cable and in the unsettled medium in comb.This will make model introduce uncertain factor, cause the bigger error of calculation.
2, built-in: in the cables manufacturing stage, with thermometric optical fiber or optical cable join certain outer layer of cable insulation or certain two-layer between, most typical setting is to be between semiconducting insulation screen and the metallic sheath.Chinese patent publication number CN1624812A, japanese patent application publication No. 1990-144810,1994-148001,1994-181013,1994-181014 and 1994-181015 have disclosed multiple fiber composite power cable.They structurally all are arranged in optical cable between cable insulation and the sheath.In built-in method, optical cable very as one man is in certain outer one deck of cable insulation, has solved the problem of above-mentioned external, also must handle the connectivity problem of cable joint place optical fiber well, and this makes the cable joint installation process become complicated.Usually will adopt a wire jumper optical cable, two weld are respectively with the fiber optic tap welding of two cables.That is to say that in the Temperature Distribution for a cable of monitoring, the quantity of the weld on the thermometric optical fiber is the twice of cable joint quantity at least.
Fig. 1 is the connection sketch map of transition joint of the prior art and optical cable.Optical cable is placed on the outside of insulating barrier in the conventional optical cable composite power cable; Therefore at first two sections optical cables to be connected 17,18 are drawn from the side of cable joint the time between on the make; Electric part connects separately then, and its conductor coupling portion part 16 is generally two chamber butt joint forms.Opticator connects in addition outside electric part and protects.Two sections optical cables of drawing 17,18 are connected with middle wire jumper 21 through two connector boxs 19,20 respectively.
Statistics shows that cable intermediate joint and cable termination put into operation several years ago at cable system, and its failure rate is far longer than the failure rate of cable body.Fault type had both comprised because the bad connection of the connector of cable conductor or binding post causes overheatedly, had also comprised cable intermediate joint and cable termination because the defective of design, manufacturing and erection stage introducing or insulation fault that bad point causes.And in above-mentioned optical cable arrangement; Detection optical fiber is positioned at the cable insulation outside of earth potential; And the physical dimension of this insulation is all greater than the insulation of cable body; In more situation, optical fiber even have to be arranged in outside the cable metal shielding or cable joint waterproof jacket with bigger physical dimension.At this moment, the position at detection optical fiber place is compared with the situation of cable body the temperature response of conductor heating, not only a little less than but also hysteresis.The calculating conductor mathematic model of temperature of setting up for cable body just can not be suitable at this, and the temperature anomaly of cable also is not easy to be detected.Likewise, the local discharge signal that its built-in electrical insulation fault is produced is also decayed comparatively seriously because will penetrate thicker insulation and other sheaths, is difficult for being detected by detection optical fiber.
In addition, for long cable, use conventional method, the quantity of fused fiber splice point is more.The fused fiber splice point has certain loss and unreliability, and the DTS thermometric is caused negative effect.Another built-in significant disadvantage is, because the residing position of optical fiber, is coiled making at cable, transports, and the installation and operation stage might receive tension force.And the mechanical strength of optical fiber is very low, can't keep in repair again in case damage.Therefore protection design, manufacturing and the construction to optical fiber all proposed higher requirement.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the above-mentioned prior art, a kind of transition joint is provided, be used for being compounded with in the stube cable conductor high voltage power cable of optical fiber.Transition joint of the present invention and method of attachment are connected to realize the electric and optics that is compounded with the high voltage power cable of optical fiber in the conductor.
Technical scheme of the present invention is following:
A kind of transition joint that connects the high-tension cable of composite fiber; Comprise conductor adapting piece, insulation and stress equilibrium unit and metal shell; Described conductor adapting piece is the pipe fitting of a longitudinal section for " worker " font, and the middle part of this pipe fitting is a dividing plate, and the both sides of dividing plate are to lead to outside chamber; Two conductor terminations of high-tension cable can be positioned in the chamber of conductor adapting piece internal partition both sides respectively; The outside of conductor adapting piece has insulation and stress equilibrium unit and metal shell successively, it is characterized in that, has at least one on the described dividing plate and holds the passage that the optical cable in the high-tension cable conductor passes.
Be provided with at least one fiber channel in the conductor of described cable; Be provided with at least one optical cable in each fiber channel; Passage and optical cable axially along stretching, are distributed in the total length of cable along cable, and the diameter of said fiber channel is greater than the diameter of described optical cable; The length of said optical cable is greater than the length of said fiber channel, and this optical cable is distributed in the described fiber channel agley.
A kind of installation method of transition joint of the high-tension cable that utilizes described connection composite fiber, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively, and this cable socket exposes the conductor termination;
Second step was pulled out optical cable A in the conductor of first cable, and pass conductor adapting piece, stretched in the chamber from conductor adapting piece one end, passed dividing plate upper channel and another chamber, stretched out from the other end of conductor connector;
The 3rd step was pulled out optical cable B in the conductor of second cable, and was that optical cable A and B make fiber cable joint;
The 4th step inserted the conductor termination of first cable and the conductor termination of second cable respectively in the chamber of conductor adapting piece, utilized Press Plier that conductor adapting piece and conductor end head-clamp is tight;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
Described fiber cable joint is a rigidity pipe fitting, and its two ends are carried out reliable mechanics with the oversheath of two sections optical cables respectively and are connected.
The length of described fiber cable joint is greater than 1/2 of described conductor adapting piece length, and its external diameter is less than the internal diameter of fiber channel in the conductor.
The installation method of the transition joint of the high-tension cable of another kind of described connection composite fiber, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively, and this cable socket exposes the conductor termination;
Second step was pulled out optical cable A in the conductor of first cable; The optical cable A that stretches out penetrates from an end of guiding tube again; Pass from the other end, optical cable A passes a conductor adapting piece and a guiding tube more then, and optical cable A stretches in the chamber from conductor adapting piece one end; Pass dividing plate upper channel and another chamber, stretch out from the other end of conductor connector;
The 3rd step was pulled out optical cable B in the conductor of second cable, and was that optical cable A and optical cable B make fiber cable joint;
The 4th step inserted the conductor termination of first cable and the conductor termination of second cable respectively in the chamber of conductor adapting piece; Insert respectively in the fiber channel in the conductor of first cable and second cable at the two ends of described guiding tube, and utilize Press Plier that conductor adapting piece and conductor end head-clamp is tight;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
Described guiding tube internal diameter is greater than the external diameter of described optical cable, and described conducting tubes external diameter is less than the internal diameter of fiber channel in the conductor, and its outer wall is provided with a convexity, and this length that is raised at least one termination wherein is greater than 1/2 of conductor adapting piece length.
The manufacturing materials of described guiding tube is copper or is the alloy of main component with copper or is aluminium or is the alloy of main component with aluminium or is austenitic stainless steel.
In the present invention, the manufacturing materials of described fiber cable joint is copper or is the alloy of main component with copper or is aluminium or is the alloy of main component with aluminium or is austenitic stainless steel, or is a hot melting plastic pipe that has rigid backbone.
Technique effect of the present invention:
The present invention is in order to solve the connectivity problem of the high voltage power cable that has optical cable in the cable conductor; On the dividing plate at the conductor adapting piece middle part that has proposed to be " worker " font on original transition joint basis, offered one and held the passage that optical cable passes through in the longitudinal section; So that the optical cable after the welding still is in the middle part of cable conductor; Therefore optical fiber can directly detect the conductor temperature of cable, and can detect the ultrasonic signal that cable office puts effectively.In the present invention, optical cable equipotential under high-voltage potential connects, and does not cross over the high-low pressure potential difference, and the insulation of existing cable intermediate joint is not had any impact, and mounting process is simple and reliable.
Description of drawings
Fig. 1 is the connection sketch map of transition joint of the prior art and optical cable.
Fig. 2 is the structural representation of the transition joint of the present invention's high-tension cable of connecting composite fiber.
Fig. 3 is a kind of structure cut-away view of conductor adapting piece of transition joint of the high-tension cable of connection composite fiber of the present invention.
Fig. 4 is the another kind of structure cut-away view of conductor adapting piece of transition joint of the high-tension cable of connection composite fiber of the present invention.
Fig. 5 is embodiment 1 sketch map of the method for the transition joint of the present invention high-tension cable that connects composite fiber.
Fig. 6 is embodiment 2 sketch mapes of the method for the transition joint of the present invention high-tension cable that connects composite fiber.
Wherein,
The spacing muscle of wire jumper 22-dividing plate 23-in the middle of the protruding 16-conductor coupling portion of 1-conductor adapting piece 2-insulation 3-stress equilibrium unit, the unit 4-metal-back 5-passage 6-first center conductor 7-second center conductor 8-first chamber 9-, the second chamber 10-dividing plate 11-, the first optical cable 12-, the second optical cable 13-fiber cable joint 14-guiding tube 15-part 17-optical cable 18-optical cable 19-connector box 20-connector box 21-
Embodiment
Come further detailed description is done in the transition joint of the high-tension cable that is connected composite fiber of the present invention and the method for utilizing this transition joint to connect the high voltage power cable of composite fiber below in conjunction with accompanying drawing and concrete embodiment, but can not limit protection scope of the present invention with this.
Using cable of the present invention is a kind of high voltage power cable; In the conductor of this kind cable, be provided with at least one fiber channel, be provided with at least one optical cable in the fiber channel, passage and optical cable are axially stretched on the edge along cable; Be distributed in the total length of cable; The internal diameter of said fiber channel is greater than the external diameter of optical cable, and the length of optical cable is greater than the length of fiber channel, and this optical cable is distributed in the fiber channel agley.In use; Optical cable can be extracted a segment distance out in the conductor of cable; Optical cable can also lean on the elastical retraction of self in fiber channel, perhaps lean on artificial optical cable to be back in the fiber channel, retraction or back in the fiber channel optical cable still bent portions be distributed in the fiber channel.
Above-mentioned optical cable carries out being connected when must consider optical cable with cable in the connection procedure at two ends, also optical cable is not crossed over high potential and earth potential, can guarantee safety like this.Transition joint of the present invention connects for the photoelectricity of realizing above-mentioned cable and designs.
Please see Fig. 2 earlier, Fig. 2 is the structural representation of the transition joint of the present invention's high-tension cable of connecting composite fiber.Can find out by figure, connect the transition joint of the high-tension cable of composite fiber among the present invention, comprise conductor adapting piece 1, insulation unit 2, stress equilibrium unit 3 and metal shell 4. Unit 2 and 3 formation insulation and stress equilibrium unit, stress equilibrium unit wherein insulate.Described conductor adapting piece 1 is the pipe fitting of a longitudinal section for " worker " font, and the middle part of this pipe fitting is a dividing plate, has passage 5 on the described dividing plate, and the optical cable that this passage can hold in the high-tension cable conductor passes through.The dividing plate both sides are to lead to outside chamber, and this chamber is respectively applied for the conductor termination that holds and fix two sections cables.The outside of conductor adapting piece 1 is provided with insulation and stress equilibrium unit and metal shell 4 successively, and these outer distributions are mainly insulation and the protective effect of playing electric conductor.
Fig. 3 is a kind of structure cut-away view of conductor adapting piece of transition joint of the high-tension cable of connection composite fiber of the present invention.Can find out that by figure the passage on the described dividing plate 22 is a circular hole, the internal diameter of this circular hole is greater than the external diameter of the optical cable in the cable conductor.
Fig. 4 is the another kind of structure cut-away view of conductor adapting piece of transition joint of the high-tension cable of connection composite fiber of the present invention.The centre of conductor adapting piece 1 is provided with a spacing muscle 23, and the center of spacing muscle 23 is a passage, and spacing muscle 23 is that the passage offered on the dividing plate is excessive and form, or the obstacle that stops the conductor termination that in the straight channel of a conductor adapting piece 1, is provided with.Spacing muscle 23 only plays barrier effect to the conductor termination that extend in the chamber, makes the conductor termination can only extend into spacing muscle 23 positions of conductor adapting piece.
Embodiment 1
Fig. 5 is embodiment 1 sketch map of the method for the transition joint of the present invention high-tension cable that connects composite fiber.This Figure illustrates a kind of installation method of transition joint of the high-tension cable that utilizes described connection composite fiber, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively, separates wherein first center conductor 6 and second center conductor 7 respectively;
Second step was pulled out first optical cable 11 in first center conductor 6 of first cable, first optical cable 11 is passed first chamber 8, passage 5 and second chamber 9 successively, and from second chamber 9, pass certain-length;
The 3rd step was inserted into first center conductor 6 in first chamber 8, and was butted on dividing plate 10 places.In second center conductor 7 of second cable, pull out second optical cable 12; And to utilize a length be that first optical cable 11 and second optical cable 12 are made fiber cable joints 13 greater than 1/2 stainless steel tube of conductor adapting piece length; This stainless steel tube protection fused fiber splice point and the part optical fiber that separates; And the two ends of stainless steel tube overlap respectively on the oversheath of first optical cable 11 and second optical cable 12; And utilizing two ends that Press Plier clamps stainless steel tube with fixing first optical cable 11, second optical cable 12 and fiber cable joint 13, the external diameter of this fiber cable joint 13 makes this fiber cable joint 13 can penetrate in the fiber channel less than the internal diameter of fiber channel in each cable conductor;
Next the 4th step was divided into two stages: first stage; With the end face of second center conductor 7 of second cable inlet near second chamber 9 of conductor adapting piece 1; In this stage; The optical cable that can assist by hand to have connected pushes in the fiber channel in the cable conductor gradually, and guarantees that when second stage begins fiber cable joint 13 jumps between the end face of two cable conductors; Second stage; The termination of second center conductor 7 is inserted second chamber 9 of conductor adapting piece; In this stage, naked eyes can't be seen optical cable, more can't assist optical cable is pushed the optical cable conduit at its place by hand; Detecting optical cable will rely on the rigidity of fiber cable joint 13; Guarantee in this process, obvious deformation not to take place and be retracted into the fiber channel that is arranged in cable conductor voluntarily, insert second chamber 9 of conductor adapting piece up to the termination of second center conductor 7 fully and be butted on the dividing plate of conductor adapting piece, utilize Press Plier to make conductor adapting piece clamp the conductor termination;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
Fig. 6 is embodiment 2 sketch mapes of the method for the transition joint of the present invention high-tension cable that connects composite fiber.This Figure illustrates a kind of installation method of transition joint of the high-tension cable that utilizes described connection composite fiber, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively, separates first center conductor 6 and second center conductor 7 respectively;
Second step was pulled out first optical cable 11 in first center conductor 6 of first cable; This first optical cable 11 is passed guiding tube 14 and exposes suitable length; Guiding tube 14 is processed for copper product, and the position has discoid protrudingly 15 therebetween, and the external diameter of this guiding tube 14 and the internal diameter of the fiber channel in the cable conductor are loose fit; Protruding 15 external diameter is greater than the internal diameter of fiber channel, an end of guiding tube 14 is inserted in the fiber channel of first conductor 6 until protruding 15 places;
First chamber 8 of the 3rd step conductor adapting piece 1 is inserted in first conductor 6; Until dividing plate 10 places; In second conductor 7 of second cable, pull out second optical cable 12, and be that first optical cable 11 and second optical cable 12 are made fiber cable joint 16, this fiber cable joint 16 two ends overlap joint is on the oversheath of first optical cable 11 and second optical cable 12; Utilize Press Plier to clamp two terminations of fiber cable joint 16, first optical cable 11, second optical cable 12 and fiber cable joint 16 are linked into an integrated entity;
Next the 4th step was divided into two stages.In first stage, with second conductor, 7 end faces of second cable inlet near second chamber 9 of conductor adapting piece 1, in this stage, the optical cable that can assist by hand to have connected pushes the fiber channel that is positioned at cable conductor at its place gradually; Second stage; The termination of second conductor 7 is inserted second chamber 9 of conductor adapting piece; Guiding tube 14 is extend in the fiber channel of second conductor 7 at an end of second chamber 9; Insert second chamber 9 of conductor adapting piece up to the termination of second conductor 7 fully, until being butted on the dividing plate place, and utilize Press Plier that conductor adapting piece is clamped each conductor termination;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
Undoubtedly, the method for the transition joint of the high-tension cable of connection composite fiber of the present invention and connection high-tension cable also has other structure to substitute and material selection, the part that is not limited to mention in the foregoing description.Generally speaking, protection content of the present invention also comprises other conspicuous to those skilled in the art conversion and substitutes.
Claims (10)
1. transition joint that connects the high-tension cable of composite fiber; Comprise conductor adapting piece, insulation and stress equilibrium unit and metal shell; Described conductor adapting piece is the pipe fitting of a longitudinal section for " worker " font, and the middle part of this pipe fitting is a dividing plate, and the both sides of dividing plate are to lead to outside chamber; Two conductor terminations of high-tension cable can be positioned in the chamber of conductor adapting piece internal partition both sides respectively; The outside of conductor adapting piece has insulation and stress equilibrium unit and metal shell successively, it is characterized in that, has at least one on the described dividing plate and holds the passage that the optical cable in the high-tension cable conductor passes.
2. the transition joint of the high-tension cable of connection composite fiber according to claim 1 is characterized in that, is provided with at least one fiber channel in the conductor of described cable; Be provided with at least one optical cable in each fiber channel; Passage and optical cable axially along stretching, are distributed in the total length of cable along cable, and the diameter of said fiber channel is greater than the diameter of described optical cable; The length of said optical cable is greater than the length of said fiber channel, and this optical cable is distributed in the described fiber channel agley.
3. the installation method of the transition joint of the high-tension cable of the described connection composite fiber of claim 2 is characterized in that, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively;
Second step was pulled out optical cable A in the conductor of first cable, and passed conductor adapting piece;
The 3rd step was pulled out optical cable B in the conductor of second cable, and was that optical cable A and optical cable B make fiber cable joint;
The 4th step inserted the conductor termination of first cable and second cable respectively in two chambers of conductor adapting piece, and utilized Press Plier that conductor adapting piece and conductor end head-clamp is tight;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
4. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 3, described fiber cable joint are a rigidity pipe fitting, and its two ends are carried out mechanics with the oversheath of two sections optical cables respectively and are connected.
5. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 4; It is characterized in that the manufacturing materials of described fiber cable joint is copper or is the alloy of main component with copper or is aluminium or is the alloy of main component with aluminium or is austenitic stainless steel.
6. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 3 is characterized in that, described fiber cable joint is a hot melting plastic pipe that has rigid backbone.
7. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 4, the length of described fiber cable joint are greater than 1/2 of described conductor adapting piece length, and its external diameter is less than the internal diameter of fiber channel in the conductor.
8. the installation method of the transition joint of the high-tension cable of the described connection composite fiber of claim 2 is characterized in that, this method comprises the steps:
The first step is that first cable and second cable to be connected made cable socket respectively;
Second step was pulled out optical cable A in the conductor of first cable, and optical cable A is passed a conductor adapting piece and a guiding tube;
The 3rd step was pulled out optical cable B in the conductor of second cable, and was that optical cable A and B make fiber cable joint;
The 4th step inserted the conductor termination of the conductor termination of first cable and second cable respectively in two chambers of conductor adapting piece and was butted on the described dividing plate; Insert respectively in the fiber channel of first cable and second cable at the two ends of described guiding tube, and utilize Press Plier to make conductor adapting piece clamp the conductor termination;
The 5th step was accomplished the follow-up making of cable joint according to conventional operation.
9. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 8; Described guiding tube internal diameter is greater than the external diameter of described fiber cable joint; Described guiding tube external diameter is less than the internal diameter of fiber channel in the conductor; And its outer wall is provided with a convexity, and this length that is raised at least one termination wherein is greater than 1/2 of conductor adapting piece length.
10. the installation method of the transition joint of the high-tension cable of connection composite fiber according to claim 8; It is characterized in that the manufacturing materials of described guiding tube is copper or is the alloy of main component with copper or is aluminium or is the alloy of main component with aluminium or is austenitic stainless steel.
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| CN2007101721962A CN101459329B (en) | 2007-12-13 | 2007-12-13 | Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method |
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| CN2007101721962A CN101459329B (en) | 2007-12-13 | 2007-12-13 | Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method |
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| CN101459329B true CN101459329B (en) | 2012-04-18 |
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