RU24592U1 - COMMUNICATION CABLE LOW FREQUENCY WITH CORDELL PAPER INSULATION - Google Patents

Description

1. Description of utility model

1.1.Name of a useful model

“Low-frequency communication cable with paper-cord insulation

1.2 The field of technology to which the utility model belongs.

Communication cables symmetrical low-frequency homogeneous with copper conductive conductors with paper-cord insulation, designed for cabling telephone and telegraph nodes, cable entries and inserts into overhead communication lines, devices of connecting lines between the PBX, as well as PBX and MTS. Cables can be used for trunks using separate circuits in the frequency range up to 552 kHz (for transmitting up to 120 channels of tone frequency). Operating voltage of cable circuits up to 430V DC or up to 3A AC.

Preferred applications for low-frequency communication cables:

TZG brand - for laying in telephone sewers, pipes, blocks, collectors,

tunnels and indoors in the absence of mechanical stress on

cable, in a medium neutral with respect to the shell Brand TZB- for laying in soils, if the cable is not exposed to significant

tensile forces in an environment with high corrosivity

relation to the shell. TZBG brand - for laying indoors, in collectors and in tunnels.

1.3 level of technology.

Information about analogues taken from the reference book "Electric wires and cord, authors N.I. Belorussov, A.E. Sahakyan, A.I. Yakovleva, publishing house "Energy, g. Moscow, 1979t, “Theory, calculation and construction of cables and wires, Kranikhfeld LI, Ryazanov IB , Moscow, publishing house "Higher School.

The closest in essential features analogue of a low-frequency communication cable to a low-frequency communication cable of the TZG, TZB, TZBG brands.

Symmetric low-frequency cables with cordless insulation are designed for connecting telephone and telegraph nodes, cable entries and inserts into overhead communication lines, connecting devices between exchanges, as well as exchanges and MTS.

Low-frequency cable construction elements: conductive conductors, core insulation, armor

Signs of an analogue that coincide with the essential features of the cable: 4 copper single-wire conductors;

4 nominal diameter of conductive wires 0.8; 0.9; 1.2 mm; 4 nominal number of fours from 3 to 114; 4 paper-core insulation formed by paper cordela superimposed

4 isolated veins twist into a star four

4 cable core twisted from concentric groups

by midwives, twisting of adjacent midwives is carried out in opposite directions; 4 core has a belt insulation of paper tapes superimposed with

overlap

 a lead sheath is applied over the waist insulation; 4 the cable should not experience more than double bends when laying; 4 Service life 30 years, warranty service life 3 years

The nominal outer diameters of the cables for low-frequency TZG, TZB, TZBG are given in Table 1. Twisting the isolated conductors into fours by uncoordinated steps does not allow the cable to be used for connecting lines using separate circuits in the frequency range up to 552 kHz (for transmitting up to 120 channels of tonal frequency), since the mutual influence between the four circuits is great. The frequency of signal transmission is up to 150 kHz. Higher frequencies are limited by a sharp increase in attenuation.

Nominal outside cable diameters

diameter 0.90 mm

Table 1-1

Nominal and other diameters of cables with nominal conductors

diameter 1.20 mm

The use of low-frequency communication cables in the frequency range up to 552 kHz imposes special requirements on their design and source materials. The choice of the type and design of the low-frequency communication cable is determined not so much by the process of energy distribution along the line as by the need to protect the four chains located under the common shell from mutual interfering influences.

Table 1-2

1.4. The essence of the utility model

The symmetrical low-frequency homogeneous communication cable is designed to make it possible to use it for trunk lines using separate circuits in the frequency range up to 552 kHz (for transmitting up to 120 tonal frequency channels).

Requirements that a low-frequency homogeneous communication cable satisfies:

 Stable Communication and No Distortion

 Protection of cable chains from mutual and external interference

 Stability of electric parameters

The development of a low-frequency cable makes it possible to use this type of cable for trunk lines using separate circuits in the frequency range up to 552 kHz (for transmitting up to 120 channels of tone frequency)

This technical result is achieved using the following essential features:

a change in the cable design of the thickness of the insulating layer of conductive wires, which decreased by 20-30% compared with the insulation of the analog

A twist of isolated veins in fours with different coordinated steps.

The difference between the low-frequency communication cable and the analogue cable of the low-frequency brands TZG, TZB, TZBG is that

in low-frequency cables of the TZG, TZB, TZBG brands it is possible to transmit signals with a frequency of up to 150 kHz, and in low-frequency homogeneous cables the range of transmitted frequencies is much wider - up to 552 kHz., due to the matching of the steps of twisting the cores into fours, which provides better electrical parameters,

The nominal outer diameter of the low-frequency homogeneous cable is less than the outer diameter of the cable. 11ya of the TZG, TZB, TZBG grades, by reducing the insulation thickness by 20-30%;

Significant economic effect due to material savings.

1.5. The list of figures of drawings and other materials.

The drawing shows:

Figure 1 - communication cable low-frequency telephone homogeneous with cord paper insulation, in a lead sheath with seven fours, with conductive cores with a diameter of 1.20 mm

1.6 Information confirming the feasibility of a useful model.

Description of the design of the utility model:

copper single-wire conductive conductors. (fng. 1 pos. 1). The nominal diameter of the core is 0.8; 0.9; 1.2 mm. to direct the flow of electrical energy.

 on conductive veins superimposed cordless isolation (fng. 1, PO3.2), formed by a paper cordell superimposed on the core in a helical spiral and wrapped in paper tape, applied in one or two layers with overlap.

The isolated veins are twisted into a star four (fng. 1, no. 3), the twist of the star four should be no more than 300 mm. In the four, two veins located diagonally form a working pair. On a twisted four, colored cotton or synthetic yarn or paper tape is laid with an open spiral.

The core of the cable (fng. 1, nos. 6) is twisted from the groups arranged in concentric coils, the adjacent coils are twisted in opposite directions. The pitch of twisting of the core should be no more than 30 diameters per twist.

 Adjacent fours in each coil of the core have different twisting steps. In each layer, two adjacent groups (the counting group and the direction group) have a color that distinguishes them from each other and from all other groups of this county.

The midwives, except the outer one, must be wrapped in an open spiral with cotton or synthetic yarn or paper tape

Cables with the number of fours 4 and 7 with conductive wires with a nominal diameter of 1.20 mm are made with the number of different twisting steps of the fours of at least four in order to obtain circuits that can be used in the frequency range up to 552 kHz

The core of the cable has a belt insulation (fng. 1, no. 4) from paper tapes superimposed with overlapping. The number of tapes must be at least two.

 A node or between the tapes of the belt insulation or under the cable sheath should be marked with an identification tape, on which every 200 mm should be marked with numbers that allow you to determine the cable length with an error of no more than +/- 0.5%, company code, Year of manufacture.

A lead sheath was applied over the waist insulation (fng. 1, nos. 5).

The nominal diameters of the conductors and the number of four cables are given in table. 2

Nominal outer diameters and masses of cables are given in table. 3.

The electrical parameters of the cables are given in table. 4

The way to use the utility model.

Symmetrical low-frequency homogeneous cable is intended for cable lines of relatively short length (tens, sometimes hundreds of kilometers), for the installation of connecting lines between telephone exchanges, cable inserts in overhead communication lines when they cross water spaces, power lines, cabling telephone and telegraph communication centers, and connecting radio stations with radio studios and with long-distance telephone exchanges, etc. These cables transmit telegraph signals, telephone calls and broadcast programs. In conductive conductors (fng 1 nos 1), the encoded electrical signal is transmitted from the source to the consumer. Paper-cord

- -zoo2

insulation (Fig. 1 pos 2) creates a geometrically stable insulation gap.

Description of the elements of co-construction, due to which it becomes possible to obtain a technical result - the use of this type of cable for connecting lines using separate circuits in the frequency range up to 552 kHz (for transmitting up to 120 channels of tonal frequency)

Materials used for the manufacture of cables:

and copper wire rod TU 16 K71-003-87

a telephone paper GOST 3553-87

a Cable paper GOST 23436-83 a Cotton yarn and mixed severe

cord and comb for weaving production OST R17-15-016-94

a Harsh cotton yarn GOST 6904-83

a cable paper TU 13-00279410-35-94

o Paper cord for communication cablesTU 13-0281099-09-91

a Technical polyester thread GOST 24662-94 a Polyester thread for cable

Industry TU 6-13 -40-90 a Lead-antimony alloy SSu or Vi SSuMT TU 48-6-89-84

The insulation of the conductive conductors creates a geometrically stable insulation gap between the conductors and the grounded surfaces, which protects the conductors from being shorted in the circuit, and also for safety reasons, from electric shock. Higher regulatory requirements.

The twisting of isolated conductors into fours with different coordinated steps has a decisive influence on the electrical parameters of the cable, and therefore on the main indicators of signal transmission (width of the transmitted frequency range) and makes it possible to use individual low-frequency cable circuits as high-frequency.

The insulation thickness, reduced by 20-30% compared with the analogue, allows you to reduce the cost of cable manufacture, save materials.

Thanks to the developed utility model, the range of cables for connecting lines is expanding, allowing the use of individual circuits in the frequency range up to 552 kHz (for transmitting up to 120 channels of tone frequency)

-6

Nominal outer diameters of cables with nominal conductors

diameter 0.90 mm

Nominal outer diameters of cables with standard

diameter 1.20 mm Rated weights of cables with cores

2

Table 2-1

Table 2-2 .90 mm Table 3-1 Nominal Diameter

 Estimated masses of cables with conductors with a nominal diameter of 1.20 mm

Electrical parameters of communication cables and RF

.

Table 3-2

Table 4

Lengths, megohms, not less

3. The working capacity of pairs, recalculated for 1 km, nf

-Maximum average value

-Maximum individual values

4. capacitive coupling

fours at a length of 425 m, n

more between core

chains of every four

(K1)

for 100% of the values

for 90% of the values

between the main chains

next to four

(K9, K10, K11, K12)

for 100% of the values

for 80% of the values

5. capacitive asymmetry between the conductors of the main circuits for a length of 425 m, pF, not more

for 100% of values for 90% of values

6. Test voltage for 2 minutes B attached:

between veins

Diameters 0.80 and 0.90

mm

between veins

1.20 mm in diameter - between cores and

shell

7. The difference between the maximum and minimum values of the working capacity, recalculated per 1 km of length, for identical chains of building length, nF, no more

L / 1000

36.0 38.0

L / 425

210 120

180 50

L / 425

0.80

700,400

700 (990)

1000 (1400)

1800 (2550)

6.0

0.80

Claims (1)

Communication cable low-frequency, symmetrical, homogeneous, with copper conductive conductors, with paper-cord insulation, characterized in that the insulated conductors are twisted into fours with different coordinated steps, the insulation thickness of the conductors is reduced by 20-30%.