RU53493U1 - WINDING WIRE - Google Patents

Abstract

The utility model relates to the cable industry of the electrical industry and can be used for windings of electrical machines, apparatus and instruments, dry transformers, as well as windings-motors for severe operating conditions. A layer of heat-resistant polyesterimide enamel applied directly to a conductive core and one layer of fiberglass or fiberglass polyester impregnated with silicone varnish with a heat resistance class of 200 ° C is used as insulation for a round or rectangular copper conductor. The developed wire has high length-stable electrical characteristics, high mechanical strength, an increased heat resistance class of 200 ° C, as well as better compatibility of insulating materials with impregnating compounds used in the formation of windings of electrical machines, apparatus and devices, dry transformers, and also motor windings for severe operating conditions The use of a winding wire allows to increase the current load of the high voltage windings of dry transformers, about a coil of electrical machinery, apparatus and appliances, and motor windings for severe operating conditions, thanks to an increase in cross-section of copper in the slot, a resource for electrical machines Winding short circuit windings, increase the service life and reliability in service.

Description

The utility model relates to the cable industry of the electrical industry, namely to the designs of round and rectangular copper winding wires with enamel-fiberglass and enamel-glass-polyester insulation, which are mainly used in the windings of electrical machines, apparatus and instruments, dry transformers, as well as in the windings of electric motors for severe operating conditions.

A winding wire containing a copper conductive core coated with a layer of heat-resistant enamel directly applied to the conductive core and one layer of fiberglass or fiberglass polyester impregnated with epoxy-polyester varnish with a heat resistance class of 155 ° C [6] can be considered an analogue of development.

The developed utility model satisfies the following conditions:

- high dielectric strength;

- high mechanical strength;

- minimum insulation thickness;

- has a profile shape as close as possible to the groove profile of an electric machine;

- increased heat resistance [5]

The electric strength of winding wires with enamel-fiberglass and enamel-fiberglass insulation is determined in

mainly by the properties of enamel insulation [1]. The use of heat-resistant polyesterimide enamel for enameling a conductive core allows to obtain high stable electrical characteristics in length. Fiberglass and fiberglass yarns have a rare combination of properties: high strength in bending, stretching, compression, incombustibility, heat resistance, low hygroscopicity, resistance to chemical and biological influences. The main advantage of organosilicon varnishes is their high heat resistance [3].

The combination of heat-resistant polyetherimide enamel and impregnating organosilicon varnish allows to obtain wires with a heat resistance class of 200, which allows long-term operation of the wires at high temperatures up to 200 ° C and allows short-term heating to 250-300 ° C [2].

Impregnation of insulation with organosilicon varnish increases the compatibility of electrical insulating materials of the wire with impregnating compounds used in the formation of windings of electrical machines, apparatus and equipment, dry transformers, as well as electric motors for severe operating conditions.

Wires with insulation made of heat-resistant polyetherimide enamel superimposed on a copper conductive core and one layer of fiberglass or fiberglass polyester filaments are characterized by a large fill factor of the groove of electrical machines due to the smaller thickness of the insulating

coating, which allows to increase the current load of the winding due to the increase in the cross section of copper in the groove [4].

The technical result of the utility model is to obtain high stable electrical characteristics along the length, high mechanical characteristics with a smaller thickness of the insulating coating, the compatibility of electrical insulating materials of the wire with impregnating compositions used in the formation of the windings of electrical machines, apparatus and devices, dry transformers, electric motors for severe operating conditions, high heat resistance of insulation.

Figure 1 shows a sectional view of a wire.

A layer of heat-resistant polyetherimide enamel and one layer of fiberglass or fiberglass polyester fibers impregnated with organosilicon varnish with a heat resistance class of 200 ° C are applied to a round or rectangular conductive core (1) (2).

The proposed winding wire has high length-stable electrical characteristics: breakdown voltage of the insulation of a round wire - not less than 1800 V, of a rectangular wire - not less than 2000 V; high mechanical strength: the average and minimum number of needle reciprocating strokes for a round wire is 300/200, respectively, for a rectangular wire 600/400, respectively, and quite thin insulation: the minimum diametrical thickness of the insulation of a round wire is 0.16-0.21 mm, minimum thickness of insulation of a rectangular wire

side "Aa" - 0.17-0.21 mm, on the side "B-in" - 0.15-0.17 mm. Impregnation of insulation with organosilicon varnish increases the compatibility of electrical insulation materials of the developed wire with impregnating compounds used in the formation of windings of electrical machines, apparatus and equipment, dry transformers, electric motors for severe operating conditions.

The wires are characterized by a large fill factor of the groove of electric machines due to the smaller thickness of the insulating coating, which allows to increase the current load of the winding due to the increase in the cross-section of copper in the groove.

Using the developed wire allows you to strengthen the coil insulation of high voltage windings of dry transformers, windings of electrical machines, apparatus and instruments, electric motors for severe operating conditions, as well as to increase their reliability during operation.

The developed wire for heat resistance of insulation belongs to class 200 (200 ° C) according to GOST 8865-93.

The minimum ambient temperature allowed during wire operation is minus 60 ° С.

The resource of not technologically processed wire at a temperature of 200 ° C is 20,000 hours.

BIBLIOGRAPHIC LIST

1. Peshkov I.B. Winding wires. M .: Energoatomizdat, 1995

2. Kabystina G.F. Winding wires with fiber insulation and the technology of their production. M .: Energy, 1976.

3. Astakhin V.V., Trezvov V.V., Sukhanova I.V. Electrical insulating varnishes, films and fibers. M .: Chemistry, 1986.

4. The Lokomotiv Magazine No. 3 2005

5. The journal “Cables and wires” No. 2 (273) 2002

6. Utility model of the Russian Federation No. 42912, 2004

Claims (1)

A winding wire containing a round or rectangular copper conductive core coated with a layer of heat-resistant polyetherimide enamel directly applied to the conductive core and one layer of fiberglass or fiberglass strands, characterized in that, in order to increase the insulation resistance to long-term thermal effects, the compatibility of electrical insulation materials of the wire with impregnating compositions used in the formation of the windings of electrical machines, apparatus and equipment, dry transformers, and e windings of electric motors for heavy duty, one layer of filaments of fiberglass or silicone varnish steklopoliefira impregnated with the class of heat resistance of 200 ° C.