CN206210552U - A kind of transformer core great current lead wire magnetic leakage shielding device - Google Patents

Abstract

The utility model relates to a magnetic leakage shielding device for a large current lead wire used in a transformer iron core, which belongs to the technical field of transformer manufacturing. The technical solution is: a copper shielding ring (3) is provided at the last lamination of the transformer core, a core heat dissipation oil channel (2) is set between the copper shielding ring (3) and the next last lamination of the iron core, and the copper shielding ring (3) is provided The pull plate (1) is set outside the shielding ring, and the iron core hot oil channel 2 (4) is set between the copper shield ring and the iron core pull plate; the insulating gasket is set between the pull plate and the iron core web to make the pull plate and the core belly The boards are insulated to prevent overheating caused by the circulating current caused by the high-current leads. The utility model utilizes the circular current anti-magnetic effect produced by the copper material to shield the magnetic flux leakage, and adopts an insulating structure between the web plate and the pull plate, changes the position of the original iron core lamination into copper material, and uses the last-stage iron core outside the copper material shielding ring. Iron core hot oil passages on both sides; greatly curb the overheating effect of magnetic flux leakage in the core laminations; at the same time avoid local overheating of copper due to circulation.

Description

A magnetic flux leakage shielding device for high-current leads for transformer cores

technical field

The utility model relates to a magnetic leakage shielding device for a large current lead wire used in a transformer iron core, which belongs to the technical field of transformer manufacturing.

Background technique

For large-capacity, high-voltage generator transformers, due to their large capacity and large total leakage flux, the iron core is affected by magnetic flux leakage, and local overheating is more serious. Local overheating conditions. Background Art If the core web and tie plate connection structure is used, a loop will be formed in it to cause a circulating current, and the connection position is prone to overheating; if an insulating structure is adopted between them, the magnetic flux leakage will enter the adjacent core laminations. The laminations are also electrical conductors, which generate circulating currents in the laminations, and the joints of the laminations have high resistance and are prone to false connections, so the joints of the laminations are prone to local overheating.

Utility model content

The purpose of the utility model is to provide a large-current lead wire flux leakage shielding device for a transformer core, which fully avoids the overheating influence of the large-current lead wire leakage on the core while retaining more than 98% of the cross-sectional area of the original core laminations, while retaining Most of the no-load performance and short-time overload performance of the transformer are improved, and the above-mentioned problems in the background technology are solved.

The technical scheme of the utility model is:

A large-current lead wire leakage shielding device for a transformer core, including a pull plate, an iron core heat dissipation oil channel, a copper shielding ring and an iron core thermal oil channel two; Iron core heat dissipation oil channel 1 is set between the metal shielding ring and the last-stage lamination of the iron core, a pull plate is set outside the copper shield ring, and iron core hot oil channel 2 is set between the copper shield ring and the iron core pull plate; between the pull plate and the iron core Insulating gaskets are set between the core webs to insulate the pull plate and the iron core webs to prevent overheating caused by the circulation caused by the large current lead wires; remove the final laminations of the iron core, and set a copper shielding ring at the same position , between the copper shielding ring and the last-stage lamination, set the iron core hot oil passage 1, and between the copper shielding ring and the iron core pull plate, also set the iron core hot oil passage 2, that is, both sides of the copper shielding ring are equipped with heat dissipation The oil channel maintains its good heat dissipation condition.

By adopting the utility model, the good electrical conductivity of the copper material is fully utilized to form a short-circuit ring on the surface of the iron core, and the overheating effect of the magnetic flux leakage in the iron core is greatly curbed by using the principle of circular current antimagnetic. In addition, because the web plate and the pull plate have been disconnected, the short circuit no longer exists, and the circulation overheating situation will not be generated here.

The beneficial effects of the utility model are: the utility model patent makes full use of the good electrical conductivity of the copper material, utilizes the circular current antimagnetic effect produced by the copper material to shield the magnetic flux leakage, and adopts an insulating structure between the web plate and the pull plate, and removes the iron core end. stage laminations, change the position of the original iron core laminations to copper, and set the iron core hot oil passage between the copper shielding ring and the last stage laminations, and use the high conductivity of copper to generate circulating currents, making magnetic flux leakage Under the action of eddy current demagnetization, it is not allowed to enter the iron core laminations. At the same time, outside the copper shielding ring, the iron core hot oil passages on both sides of the final iron are used to strengthen the heat dissipation of the copper; greatly curbing the overheating of the magnetic flux leakage in the iron core laminations Effectiveness; at the same time, it avoids local overheating of copper due to circulation.

Description of drawings

Fig. 1 is a transverse sectional view of the iron core structure of the embodiment of the utility model;

Fig. 2 is a partial cross-sectional view of the main column of the iron core in the embodiment of the present invention;

In the figure: drawing plate 1, iron core cooling oil passage 2, copper shielding ring 3, iron core hot oil passage two 4.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

A large-current lead wire leakage shielding device for a transformer core, comprising a pull plate 1, a core cooling oil passage 2, a copper shielding ring 3, and an iron core heating oil passage 2 4; a copper material is provided at the final lamination of the transformer core Shielding ring 3, iron core heat dissipation oil passage 1 is set between copper shielding ring 3 and the core laminations, pull plate 1 is set outside copper shielding ring 3, iron core heat sink is set between copper shielding ring and iron core pull plate Oil passage 2 4; install an insulating gasket between the pull plate and the iron core web to insulate the pull plate and the iron core web to prevent overheating caused by the circulation caused by the large current lead wire; remove the final lamination of the iron core , the copper shielding ring 3 is set at the same position, the core hot oil passage 1 is set between the copper shielding ring and the last-stage lamination, and the iron core hot oil passage 2 is also set between the copper shielding ring and the iron core pull plate, That is to say, heat dissipation oil passages are arranged on both sides of the copper shielding ring to maintain its good heat dissipation conditions.

By adopting the utility model, the good electrical conductivity of the copper material is fully utilized to form a short-circuit ring on the surface of the iron core, and the overheating effect of the magnetic flux leakage in the iron core is greatly curbed by using the principle of circular current antimagnetic. In addition, because the web plate and the pull plate have been disconnected, the short circuit no longer exists, and the circulation overheating situation will not be generated here.

Claims (1)

1. a kind of transformer core great current lead wire magnetic leakage shielding device, it is characterised in that：Comprising arm-tie（1）, radiating unshakable in one's determination Oil duct one（2）, copper material shading ring（3）With deep fat road two unshakable in one's determination（4）；Copper material shading ring is provided with transformer core final stage lamination （3）, copper material shading ring（3）Heat radiation oil duct one unshakable in one's determination is set between penult lamination unshakable in one's determination（2）, copper material shading ring（3）Outside Arm-tie is set（1）, deep fat road two unshakable in one's determination is set between copper material shading ring and arm-tie unshakable in one's determination（4）；Between arm-tie and web unshakable in one's determination Insulation spacer is set, makes to be insulated between arm-tie and web unshakable in one's determination.