RU27963U1 - FLEXIBLE CABLE WITH POLYVINYL CHLORIDE INSULATION AND SHELL - Google Patents

Description

1. Description of the ice model

1.1.Name utility model

Flexible cable with polyvinyl chloride insulation

and shell.

1.2 The technical field to which the useful

Flexible cables with PVC insulation and sheath, designed for fixed installation of power circuits and control circuits on machines and mechanisms at voltages up to bBOV AC with frequency up to bOHz. Cables can be operated at voltages up to 1000V DC.

Cables are designed for stationary operation at ambient temperatures from plus 50 ° С to minus 50 ° С, relative humidity up to 98% at temperatures up to 35 ° С.

Preferred cable application:

KGVV brands - for fixed installation with a bend radius of at least five outer cable diameters

KGVVNG brands - the same when laying in bundles.

KGVEV brands - for stationary connection of electric motors with frequency converters

KGVEVNG brands - the same when laying in bundles.

1. 3 the level of technology.

Information about analogues taken from the reference book "Electric wires and cords, authors N.I. Belorussov, A.E. Sahakyan, A.I. Yakovleva, publishing house "Energy, Moscow, 1979, as well as from the current regulatory documentation GOST 16442-80" Power cables with plastic insulation. Specifications and GOST 22483-77 "Conductors, copper and aluminum cables, wires and cords. Main parameters. Technical requirements, IPK "Publishing house of standards, Moscow, 1986.

The closest in essential features analogue of a flexible cable with polyvinylchloride insulation and a sheath is a power cable of the VVG brand for a rated voltage of 660V, frequency 50 Hz.

Power cable with copper conductive conductors, with plastic insulation and a sheath, is designed to transmit and distribute electrical energy in stationary installations to a rated alternating voltage of 660 V, frequency 50 Hz.

model.

Signs of an analogue that coincide with the essential features of a flexible cable with polyvinyl chloride insulation and sheath:

- copper or aluminum conductors, a number from 1 to 6;

- nominal section of the main copper veins: 1,5 to 50 mm

-insulation of PVC compound;

-insulated cores twisted;

- a shell made of PVC compound;

- Service life 30 years, warranty period 5 years

The conductive conductors of the VVG brand cable correspond to class 1 or 2 according to GOST 22483, which determines the stationary laying of multicore cables with a bend radius of at least 7.5 outer cable diameters. Laying with a smaller bending radius is not possible, as this will damage the structural elements of the cable.

When connecting electric motors with frequency converters in cables due to electric and magnetic fields, a process of mutual influence of the circuits on each other is observed. This leads to the appearance of interfering interference currents, which reduce the quality of transmission over communication lines; the formation of these interference currents consumes electromagnetic energy transmitted through the circuits that have an effect.

1.4. The essence of the utility model

The development of a flexible cable with PVC insulation and a sheath for stationary installation of the KGVV, KGVVNG brands allows for stationary installation with a cable bending radius of at least 5 outer cable diameters, as well as connecting motors with frequency converters.

Technical {Result - increasing the flexibility of the cable is achieved by the use of cable conductors of 3.4 or 5 classes of flexibility in accordance with GOST 22483. Conducting wires of 3.4 or 5 classes of flexibility in comparison with the conductors of classes 1 and 2 consist of a larger number of wires of a smaller diameter. With an increase in the flexibility class of the conductive core, the flexibility of the core itself and the cable product as a whole increases. Flexible cables use conductive conductors with a nominal cross section up to 10 mm inclusive of 4 or 5 flexibility classes, with a nominal cross section of 16 mm and above 3.4 or 5 flexibility classes. The first significant feature of the utility model is multi-wire conductive cable conductors of classes 3, 4 or 5 of flexibility class according to GOST 22483.

The development of a flexible cable with PVC insulation and a sheath of the KGVEV, KGVEVNG brands allows them to be used to connect electric motors to frequency converters, since the cable design has a screen overlaid on top of twisted insulated cores in the form of a braid. When using electric drives with frequency converters, it is necessary to protect the drives from electromagnetic interference that electrical cables create. This is achieved by shielding cable products. The second essential feature is useful over twisted insulated wires. models - screen, superimposed core, in the form of a braid id copper

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

The drawing shows:

figure 1. - diagram of a flexible cable with polyvinyl chloride € 1 insulation and a KGVEV grade sheath with three main conductors with a cross section of 35 mm and a residential ground with a shield made of copper wires. O n with a common

Table 1-2 1.6 Information confirming the feasibility of the utility model. Description of the design of a utility model — a flexible cable with yinml chloride insulation and sheath: Copper (Fig. 1, pos. 2) conductors consisting of wires (Fig. 1, pos. 1). The number and nominal cross section of the cores corresponds to the data indicated in the table. 1-1. Three- and four-core cables can have a grounding conductor or a zero conductor. Nominal cross-sections of grounding conductors and zero conductors must comply with the data specified in table. 1-2. Cables can have an earth conductor with a nominal cross section equal to the nominal cross section of the main core. The cores do not have any burrs, cutting edges, bulging or breaks in individual wires that could damage the insulation. Serve to direct the flow of electrical energy. 35mm cross section Table 1-1

insulation is applied to the conductors (Fig. 1, pos. 3) of PVC compound with a thickness specified in Table 1-3. Insulated cable conductors with a number of conductors up to 5 inclusive must have a distinctive color. The insulation of the zero conductors should be blue. The insulation of grounding conductors must be two-color (green-yellow), with one of the colors covering at least 30 and more than 70% of the insulation surface, and the other part. Each cable span with a number of cores of 7 or more must have a counting conductor and a conductor of a direction that differs in color from each other and from other cores. Color coding should be solid or in the form of a longitudinal strip with a width of at least 1 mm.

- Insulated conductors must be twisted in concentric coils. It is allowed to twist four- and five-core cables around a core, an insulated PVC compound.

- A screen of copper wires (Fig. 1, item 4) with a diameter of not more than 0.3 mm, made in the form of a braid with a density of at least 70%, is superimposed on top of twisted insulated cable conductors of the KGVEV and KGVEVNG brands

- A sheath of polyvinyl chloride plastic compound sheath must be applied over the screen of cables of the KGVEV and KGVEVNG brands and over twisted insulated cores of the cables of the KGVV and KGVVNG brands (Fig. 1, item 5). On the surface of the insulation and the shell there should not be cracks, bubbles and dents that deduce the thickness of the insulation and the shell beyond the maximum deviations.

The way to use the utility model.

Flexible cables with polyvinylchloride insulation and sheath are used for fixed installation of power and control circuits on machines and mechanisms at voltages up to bBOV of alternating current with a frequency of up to bOHz. Cables can be operated at voltages up to 1000V DC. Cables are designed for stationary operation at ambient temperature from minus 50 to plus 50 ° С,

Table 1-3

relative humidity of air up to 98% at temperatures up to 35 ° C. The minimum bending radius during installation should be at least 5 outer diameters of cables.

Flexible cable with polyvinyl chloride insulation and sheath is attached to machines and mechanisms. Under the action of the supplied voltage, an electric current occurs, which, distributed throughout the entire cross section of the conductive core (Fig. 1 pos 2) is transmitted from the source to the consumer. PVC insulation (fig. 1, pos. 3) creates a geometrically stable insulation gap, which protects the cores from a short circuit in the circuit, and also, for safety reasons, from electric shock.

Description of the elements of construction, due to which it becomes possible to obtain a technical result - increasing the flexibility of the cable and the suppression of electrical noise arising from the flow of electric current.

Structural elements to achieve the desired technical result: conductive cable conductors and a screen of copper wires.

Conductors of the analogue - cable brand VVG correspond to 1 or 2 class of flexibility according to GOST 22483, which ensures the laying of multicore cables with a bend radius of at least 7.5 outer diameters of the cable. The use of conductive wires of 3.4 or 5 class of flexibility in accordance with GOST 22483 allows to reduce the permissible bending radius of the cables to five outer cable diameters. Conductors of 3,4 and 5 classes of flexibility in comparison with veins of 1 and 2 classes consist of a larger number of wires of smaller diameter.

The screen that protects the drives of the frequency converters from electromagnetic interference is made in the form of a braid made of copper wires. The braid is a coating of a cable product with strands of wire in two opposite directions, while strands of one direction are intertwined with strands of the opposite.

Thanks to the developed utility model, it becomes possible to use flexible cables with PVC insulation and a sheath as power cables, while ensuring cable flexibility, as well as use flexible cables to connect electric motors to frequency converters, due to cable shielding.

Claims (2)

1. Flexible cable with polyvinyl chloride insulation and sheath, containing 3.4 or 5 copper multi-conductive conductors of flexibility class according to GOST 22483, insulated with polyvinyl chloride plastic compound, in a sheath of polyvinyl chloride plastic compound. 2. The flexible cable according to claim 1, comprising a screen of copper wires, made in the form of a braid and applied over twisted insulated cores.