CN2256582Y

CN2256582Y - Multiple magnetic circuit transformer

Info

Publication number: CN2256582Y
Application number: CN 96220928
Authority: CN
Inventors: 夏玉林
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-17
Filing date: 1996-08-17
Publication date: 1997-06-18
Anticipated expiration: 2006-08-17

Abstract

The utility model provides a transformer of a magnetic-leakage circuit -- multi-magnetic path transformer which is suitable for various types of transformers with various capacities. Magnetic leakage flux circulates in a magnetic-leakage circuit so that the stray loss and the eddy current loss of the multi-magnetic path transformer are largely reduced, the temperature rise of the hottest point of a coil is correspondingly reduced, and mechanical force is also greatly reduced when a short circuit happens. The utility model has better effect on a high-impedance transformer and makes the design of the transformer more perfect. Magnetic conductors are all made of silicon steel sheets, and are arranged on the end of the coil, between the coil and an iron core and between the coil and the wall of an oil tank, and thus, the magnetic conductors placed around the coil form the independent magnetic-leakage circuit.

Description

Multiple magnetic circuit transformer

The utility model includes the novel transformer in leakage field loop---multiple magnetic circuit transformer.

The critical component of transformer remains iron core and coil at present, and iron core is the main magnetic circuit of transformer, and leakage flux is all arranged around each coil.But, all transformers---power transformer, furnace transformers etc. are not all to the complete leakage field loop of leakage flux design.And the structure of every transformer is different, so just be hard to know the truth of stray flux distribution, can not calculate exactly and can not eliminate the stray loss that leakage field causes, eddy current loss and the influence to transformer at aspects such as temperature rises very effectively.

The stray loss of transformer can only estimate with empirical equation, occurs in what position of transformer as for these losses, remains a unknown number.The transformer that for example has finds that certain several case is too high along the bolt temperature when operation, reach about 120 degrees centigrade, and the transformer oil tank wall local temperature that has is crossed high phenomenon, and these all are that leakage field causes.The eddy current loss of coil can not calculate its numerical value equally accurately.When transformer short-circuit, leakage field produces huge mechanical force to electric current, and coil is damaged, and causes serious accident, and this equally also is that leakage field causes.

The loss that leakage field causes accounts for about 5～55% of the basic loss I*I*R of transformer, and these energy become heat energy, waste.But also heat dissipation equipment will be installed, thereby increase the cost of transformer on transformer.

The purpose of this utility model is to provide the transformer in independent leakage field loop---multiple magnetic circuit transformer, allows leakage flux circulate in the leakage field loop, thereby makes the stray loss of transformer, and eddy current loss reduces greatly, also may ignore.The numerical value of loss also can calculate more exactly.Since the reduction of loss, the also corresponding reduction of the temperature rise at the hottest point that leakage field causes in coil, and mechanical force also reduces greatly during short circuit.Thereby make the design of transformer scheme more perfect.

In order to realize the foregoing invention purpose, the technical solution that the utility model adopts is: design the leakage field loop around coil, the magnetic conductor in leakage field loop should be according to the type of transformer, capacity and result of calculation are arranged, be placed on end winding, between coil and the iron core, between coil and the fuel tank, magnetic conductor just forms independently leakage field loop like this.It is applicable to all kinds, the transformer of various capacity.To high-impedance transformer, better effects if.

Concrete structure of the present utility model and preferred plan are provided by accompanying drawing 1.

Fig. 1 is the leakage field loop schematic diagram of multiple magnetic circuit transformer.(1) transformer core, (2) leakage field loop magnetic conductor, (3) leakage flux, (4) transformer coil, (5) oil tank wall.

Optimum implementation: the magnetic conductor in leakage field loop all adopts cold-reduced silicon sheet to make.A magnetic conductor part that places end winding and is tightened on coil; Another part is placed on apart from coil has enough insulation squares from locating, and with insulating cement silicon steel sheet is sticked into integral body, and compresses.Compress the transformer of coil with the steel trim ring, the steel trim ring is changed into the silicon steel sheet trim ring, no longer place magnetic conductor on the trim ring.Magnetic conductor between iron core and the coil is repeatedly made with silicon steel sheet and is formed.The iron core that arm-tie is arranged, arm-tie are made of silicon steel sheet and main magnetic circuit separates with insulation, and difference ground connection.Magnetic conductor between coil and the oil tank wall, the silicon steel sheet size according to calculating is fixed on silicon steel sheet on the oil tank wall, places coil magnetic conductor on every side just to form independently leakage field loop like this.

Claims

1, a kind of multiple magnetic circuit transformer, the iron core that comprises fuel tank, coil and formation transformer main magnetic circuit, it is characterized in that having the position of stray flux distribution that the leakage field loop that allows leakage flux circulate is set around the coil, described leakage field loop is adopted by silicon steel sheet and is repeatedly made the magnetic conductor that forms, be fixed between end winding, coil and the iron core and/or between coil and the fuel tank, constitute one or more independently leakage fields loop.

2, multiple magnetic circuit transformer as claimed in claim 1, be characterised in that when it compresses the transformer of coil for adopting the steel trim ring, change the steel trim ring into the silicon steel sheet trim ring as the magnetic conductor that places end winding, and place between iron core and/or the coil and the one or more independently leakage fields of the formation of the magnetic conductor between coil and fuel tank loop.

3, multiple magnetic circuit transformer as claimed in claim 1 is characterised in that and uses arm-tie instead silicon steel sheet as the magnetic conductor between coil and the iron core when on its iron core arm-tie being arranged, and itself and main magnetic circuit are separated with insulation and difference ground connection.

4, multiple magnetic circuit transformer as claimed in claim 1 is characterised in that the magnetic conductor silicon steel sheet between described coil and the fuel tank is fixed on the oil tank wall.