DE8901972U1 - Plastic-insulated medium-voltage cable with at least one integrated optical fibre (MSL cable) with a slide-on cable fitting - Google Patents

Description

Fl 4865 .-1- 20,04./16,02,89

Feiten ft Guilleaume Energietechnik AG, D-5000 Cologne BO Description: -

Plastic-insulated medium-voltage cable with at least one integrated optical fiber (MSL cable) with a slide-on cable fitting^

The invention relates to a plastic-insulated medium-voltage cable with at least and preferably one integrated optical fiber (LVL), called MSL cable for short, with a slide-on cable fitting according to the preamble of claim 1.

Power cables for voltages from 6 to 60 kV are already described in £>E-A1 35 18 909, in which LVL are inserted to monitor the cable and control its operation. Among the various designs listed there is also a single-core FE (polyethylene) cable in which the LVL is roped into the copper shield of the cable. If it is a straight-line LVL (in contrast to sensor LVL), the LVL is loosely inserted into a protective

- tubes. Today this is mostly made of stainless steel, as it

- for example in the case of high-voltage open-loop systems with integrated LVL as described in DE-Ul 87 05 548.

For the transmission of information in power engineering systems, LVL is used in a variety of ways by the BVU (electricity supply companies) and industry. In practice, the widely used single-core VPE (cross-linked polyethylene) cables are now equipped with LVL, e.g. as a cable of type NA2XS2Y 1 &kgr; 150 RM/10, 6/10 kV + LVL.

To produce it, the inner conductive layer, insulation and outer conductive layer are extruded over the conductor in one operation. This is followed by the top layer with the under and over

•I 5

..2

t*l » · ♦

•&igr; . J i take

Fl 4865 -2- 20,04,/IS, 02.89

the pads lying on the shield. At the same time, the stainless steel tube with the LVL is strung onto the cable core. The PB edge is then extruded over it in the usual way. - The cable structure specified in VDE 0273 is disturbed as little as possible by the arrangement of the LVL tube in the shield. If a longitudinally watertight design of the cable is required, the fiber optic tube can be filled to prevent water from spreading inside.

End closures and sleeves for XLPE-insulated medium voltage cables are usually designed to be pushed on. The end closure essentially consists of a hollow cylindrical field control body made of silicone rubber, which is pushed with a press fit onto the conductor insulation C and with its base onto the shield of the gradually offset cable end. It is completely formed on the end and on the cable side as an insulating body on the outside! On the cable side, however, it is designed as a field control funnel C made of electrically conductive silicone rubber), the tube of which reaches over the outer conductive layer and the base over the folded-back shield wires of the cable. - The push-on end caps are described in the brochure "F&G end caps for plastic and paper-insulated cables up to 36 kV" from F&O Bnergletechnik A3, Cologne <1988>, an older, special design is also described in DE-C3 23 46 567.

With the push-on connection sleeves, the same field control body as with the band closure is pushed onto each cable end, the tube is cylindrical, but with the band closure it can also be club-shaped or with shields. The two conductors are enclosed in the connection area by a compression connector and further outwards by a contact shell, oil sleeve, sleeve tube, shield connection and shrink tube. - Push-on connection and band closure sleeves for plastic-insulated cables 12 to 3Θ kV are described in the brochure "Sleeves for power cables" from PAO Bnergietonnik OmbM, Cologne (1985). Such a connection sleeve with a split insulating body is described in detail in DS-C2 30 42 Sd6.

Pl 4&bgr;&bgr;&bgr; -3- 1&bgr;.02.&bgr;9

The invention is based on the object of designing the known removable fittings for plastic-coated medium-voltage cables so that they can be used for such cables with integrated LVL (MSL cables), in particular for a biner VPB cable with an LVL integrated in the shield.

The solution to this problem is specified with the characterizing features of claim 1. It essentially consists in the fact that the LVL-R5iiFuueä is deflected or extended via an auxiliary coil arranged on the screen in front of the field body, and the LVL is connected by means of a splice to an LVL cable or the LVL of the second MSL cable.

Claims 2 to 6 relate to details of the fittings for MSL cables with one LVL _, while claims 2 relate to an end closure, 3 and 4 to a connecting sleeve, 5 to the material for the LVL tube and the winding tapes, and 6 to the LVL splice. Finally, claim 7 relates to the splice housing for MSL cables with several LVLs.

The advantage achieved with the invention is that the slide-on fittings for plastic-insulated medium-voltage

n.S>nz<. iiüSSSShr SUCu for öClCtiS KSuSl Sit iütSgs~iSi~t5ii LwL &ggr;&dgr;&Ggr;&udigr;&dgr;&Ggr;&igr;&agr;" bar.

Two embodiments of the invention are shown in the drawing and are described in more detail below. They show

- Fig. 1 a termination for a single-conductor XLPE cable with an LVL integrated in the shield,

- Fig. 2 a connecting sleeve for two such cables, both figures in partially broken side view, and

- Fig. 3 a LVL splice in cross section.

Fig. 1 shows the usual single-core XLPE cable for smock voltage (MS cable) with the multi-wire Cu conductor and the cable lug 1 on the conductor end, the outer conductive layer 3 is applied over the conductor insulation 2 made of XLPE (cross-linked polyethylene). The shield 4 consists of Cu wires and the cable

Pl 4805 -4- 1&bgr;.02.89

jacket Q is applied. A pelvic body θ made of silicone rubber with a prebelt is pushed onto the gradually offset cable end. Br is completely and on the outside of the cable as an insulating body (core lobe) 6a, while on the inside of the cable it is designed as a pelvic tube (made of conductively sewn silicone rubber), the tube of which extends over the outer conductive layer 3 and the PuB over the folded-back shield wires 4.

An LVL is now integrated into this HV cable in such a way that a protective tube 8, preferably made of stainless steel, is roped into the cable shield 4, into which a sheathed (secondary coated and/or sheathed) optical fiber (LVL) is loosely inserted (MSL cable).

The LVL band closure is now designed in such a way that the LVL tube 8 is deflected in front of the field control body G and the LVL is connected to an LVL cable 10 by means of a splice 9. If the LVL were not deflected, the cable sheath would have to be stripped off over a very large length.

When redirecting, the permissible bending radius of the LVL must not be exceeded. To do this, the cable manifold 5 is first removed in front of the field control body 0 to approximately the same length as the control body, and a conical (barrel-shaped) auxiliary winding 7 made of filler tape with approximately the same external diameter as the control body is applied around the shield 4 thus exposed. The filler tape is preferably made of self-welding BPR (ethylene-propylene rubber), or PE (polyethylene). The auxiliary winding 7 serves not only to redirect the LVL tube 8, but also to store the length of the tube required for the splicing device. In order to be able to splice the LVL, a sufficiently large length (approximately 30 cm) must be available so that the LVL can be fed to the splicing device without mechanical damage.

The LVL housing 9 and the LVL cable 10 are now arranged parallel to and to the side of the end of the MSL cable 5, and a shrink tube 13 is applied over them.

&bull; * &iacgr; !·· · · · · · · · * · Fl 4865 -S- IG.02.89

which reaches underneath the folded base in the 4 and the PuB of the field control body 0, pressing it onto the shield, and which on the cable side encompasses the end of the LVL cable and the MSL cable sheath, where the output of the LVL cable 8 is sealed with a sealant. The shrink tube thus takes over the function of the cable sheath, which in the case of an MV cable without LVL reaches into the slide-on band closure (field control body).

Fig. 2 shows a connecting sleeve for two MSL cables, which is designed in such a way that the field control body 6 is pushed onto each offset end of the two cables and the conical auxiliary coil 7 is placed in front of it around the cable shield 4. The gap between the coil 7 and the sleeve pipe 14 is filled with a compensating coil 12 made of filler tape or with filling compound, which straightens the circumferential line from the cable sheath to the sleeve pipe.

A cover winding 15 made of plastic tape (EPR or PE) is applied around the two auxiliary windings, the compensation windings and the sleeve pipe, and the two LVL tubes 8 and 8' are wound over this, as with the end closure for deflection from the shield and for storing the extra length. (The cover winding can be omitted if the compensation windings are sufficient. > - The LwL splice housing 9 is arranged next to and parallel to the sleeve pipe 14, and a shrink tube 13 is applied over the entire sleeve.

With this multi-part slip-on sleeve (sleeve pipe and field control body are separate parts), the cable sheath is set slightly further apart than with a one-part sleeve. On the side where the sleeve pipe is laid down during assembly, the LVL must be redirected during assembly, for which the aforementioned auxiliary wrap 7 is used. - With a one-part slip-on sleeve, a sufficient additional length of the LVL must also be ensured. It is sufficient to apply a compensating wrap to each side of the sleeve so that a conical support for the LVL is created. - The same applies to Vickel sleeves for MSL cables.

&bull; I it· · « .

«&bull;&bull;Pll» ·· · ·· «·

F] 4865 -Θ- 30.04./16.02.89

Fig. 3 shows an LVL splice which is designed in the same way for the tape joint and the sleeve. The end of the LVL tube β and the connecting LVL or the second LVL tube β' is offset to about 164 mm. A silicone hose 17 is pushed over the exposed coated LVL 16, which engages on the one hand in the LVL tube 8 and on the other hand in the oil splice protection tube 18. A PTFB (polytetrafluoroethylene) hose 20 is pushed over the tube end, LVL and splice protection, and a heat shrink hose 21 is applied over the ends of the two FTFB hoses which abut at the splice point 19. - The LVL splice itself is carried out using known technology. The two mechanically strong and thermally stable tubes are pushed together over the splice and connected to each other using the shrink tube. A further cover with a cushioning band and a shrink tube is placed over this, thus completing the splice housing 9.

If the MSL cable contains not just one but several LVLs ₁ 1, a box-shaped (flat and elongated) flexible housing is arranged instead of the tubular splice housing 9 and integrated into the fitting, in which the splices and additional lengths of the LVL are accommodated.

Fl4665 -7- 16.02,59

List of reference symbols

to the usual MS cable

1 cable lug, on the conductor

2 conductor insulation made of VFE

3 Outer conductive layer

4 Shield, shield wires made of Cu

5 Cable sheath

6 Slide-on field control body made of silicone rubber Oa Insulating body of &thgr; 6b Field control funnel of

for end closure and sleeve for MSL cable

7 auxiliary wraps around the screen made of FU11 tape, conical

&thgr; LVL tube made of stainless steel with loosely inserted LVL V LVL-SpIeIB ₁ housing

10 LVL cables

11 Sealant

12 leveling rolls made of FU11 tape or filling compound

13 Shrink tubing

14 Socket pipe

15 Cover wrap around socket pipe and band fastener auxiliary wrap

for LVL game18 (' 16 LVL, coated 17 silicone rubber

16 Splice protection

19 LVL-8pl«iß, connection point of the two LVL

20 PTFB-Sohlauoh

21 Heat shrink tubing.

Claims (7)

Fl 4865 -1- 20,04./16,02,&bgr;& Protection claims: 1. Plastic-insulated medium-voltage cable with at least one integrated optical fiber (MSL cable) with a retractable cable fitting, - in which a field control body <6> made of silicone rubber is pushed onto the or each stepwise offset cable end with a press fit, which is completely formed at the end and on the outside as an insulating body <6a>, on the inside as a field control funnel (6b), the tube of which extends over the outer conductive layer (3) and the base of which extends over the folded-back shield wires (4) of the cable, - designed for a single-core cable with a protective tube (&THgr;) inserted in the shield (4) into which at least and preferably one optical waveguide (LVL) is loosely inserted, characterized in that» - that the LVL tube (β) is deflected in front of the field control body (Θ) and the LVL is connected by means of a splice (9> with an LVL cable ClO) or with the LVL of the second MSL cable, v' - for which the cable sheath <5> is stripped off in front of the field control body (6) to approximately the same length as the control body and a conical auxiliary wrap <7> made of FU11 tape with approximately the same external diameter as the control body is applied around the shield (4) thus exposed, over which the LVL tube (ö) is wound for deflection with the required bending radius and for storing the additional length required for the splicing device. 2. XSL cable with fitting according to claim 1 ₍ characterized in that - that in a band locking set the LVL play housing <9) and the end of the LVL cable (10>) are arranged parallel to and to the side of the end of the MSL cable sheath (S), I ;;s i _tt MM III M · ·* Fl 4865 -2- 20.04./IG.02.69 - and that a shrink tube (13) is applied over it, which reaches at the end under the folded-over shield C4> and the foot of the field control body <θ) which presses it onto the shield, and which on the cable side encloses the end of the LVL cable C10) and the MSL cable sheath (5), where the output of the fiber optic cable is sealed with a sealing compound <11) (Fig. 1). 3. KSL cable with fitting according to claim 1, characterized in - that in a connecting sleeve set the field control body <6> is pushed onto each offset end of the two cables and in front of it the small auxiliary winding <7> is applied around the shield 04) of the cable gland, and the gusset between the winding <7> and the sleeve pipe il4) is filled with a leveling winding <12> made of filler tape, with which the circumferential line from the cable sheath <5> to the sleeve pipe <14) is straightened. - that the two fiber optic tubes (8') are wound around the two auxiliary windings (C7), the compensating windings (12) and the hump tube (14) for deflection from the skid and for depositing the sweeping length, - and that the LVL-fplaißgehäuse (9) is arranged next to and parallel to the socket pipe (14), and a shrink tube (13) is applied over the entire socket. 4. MSL cable with arrangement according to claim 3, characterized in that a cover winding <15) made of plastic tape is applied around the two auxiliary windings <7>, the compensation windings (12) and the socket pipe (14), over which the two LVL tubes (β, β') are wound (Fig. 2), 5. MSL-Ka&Ql with fitting according to one of claims 1 to 4, characterized in that the LVL tube (8) is made of stainless steel and the sealing strips (7, 12) and the cover strip (15) are made of elastomeric strips BPR (ethylene-propylene rubber) or PB (polyethylene). 6. MSL cable with arrangement according to one of claims 1 to 6, characterized in that - that in the LVL game the end of each LVL round (8, 8· > on &bull; lttlt · 9 III« 4 IIIIII · · &Lgr; -4 ' X f Fl 4865 -3- 20.04./16.02.89 about 100 mm apart, and a silicone tube (17) is pushed over the exposed end of the coated LVL (16), which on the one hand engages the LVL tube <8> and on the other hand the splice protection tube <16) - and that the splice housing (9) is designed as follows: a protective tube (20), preferably made of PTFE, over the tube end, LVL and splice protection, a shrink tube (21) over the two tube ends that meet at the splice point (19), and over that a cover made of cushioning tape and another shrink tube. 7. MSL cable with fitting according to one of the preceding claims, characterized in that in MSL cables with several LVI., instead of the tubular splice housing <9>, a box-shaped (flat and elongated) flexible housing is arranged and integrated into the fitting, in which the splices and additional lengths of the LVL are arranged.