CN2901525Y - Variable magnetic flux regulating capacity transformer - Google Patents

Abstract

The utility model relates to a variable flux series-parallel connection capacity regulating transformer belonging to the power transformer technical field, which comprises three-phase high-tension windings and three-phase low-tension windings, wherein the high-tension windings are provided with a reversing switch. The three-phase high-tension winding is of a delta connection on a station of the reversing switch and of a star connection on the other station of the reversing switch. Each phase of the low-tension winding comprises three sections, wherein one section is a minority turns section and account for 27% of the total turn number of the three sections, the other two sections are majority turns sections and account for 36.5% of the total turn number of the three sections respectively. The low-tension windings are provided with a reversing switch either, two sections of majority turns on a station of the reversing switch are connected with minority turns in series after connected in parallel, the three sections of windings are all connected in series on the other station of the reversing switch. The utility model is low in material cost, capable of operating in different connection modes according to different loads, and has low open circuit losses when operating with a low load.

Description

Become the magnetic flux capacitance-adjustable transformer

Technical field

The utility model belongs to the power transformer technical field, relates to a kind of change magnetic flux rope parallel capacity regulating transformer.

Background technology

Power transformer is as long as insert electrical network, even also produce certain loss under the big no-load condition, i.e. and no-load loss.The no-load loss of common power transformer is not change with the size variation of load, thereby can a large amount of electric energy of waste in transformer whole service lifetime.In order to reduce no-load loss, the general practice of prior art is to increase material consumption or use the high-quality expensive material.The former can not reduce no-load loss significantly, though the latter can reduce no-load loss significantly, because the benefit that reduces the wastage is not enough to remedy the increase of material cost, therefore except special purpose, is restricted in general practical application.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of change magnetic flux capacitance-adjustable transformer that the cost of material is low, can move, have low no-load loss when hanging down load running with the different modes of connection under different loads.

Change magnetic flux capacitance-adjustable transformer of the present utility model includes three-phase high-voltage winding and three-phase low pressure winding, it is characterized in that, the high pressure winding is provided with reversing switch, the three-phase high-voltage winding is that triangle connects on a station of reversing switch, on another station of reversing switch, the three-phase high-voltage winding is Y-connection; Each phase low pressure winding is formed by three sections, and one section is minority wire turn section, accounts for 27% of three sections totals number of turns, and other two sections is most wire turn sections, accounts for 36.5% of three sections totals number of turns respectively; The low pressure winding also is provided with reversing switch, connects with one section minority wire turn section after two sections most wire turn sections parallel connection on the station of reversing switch again, and three sections windings are all connected on another station of reversing switch.

The utility model moves transformer by changing the mode of connection by different wiring under different loads, transformer operates under the low magnetic flux density state when hanging down load, and high capacity operates under the normal magnetic flux flux density.By the variation of magnetic energy density, make the no-load loss of transformer when hanging down load running have only below 33% of common transformer, greatly reduce the waste of electric power energy.

Description of drawings

Fig. 1 a is the wiring construction figure of high pressure winding of the present utility model when full capacity is moved;

Fig. 1 b is the wiring construction figure of low pressure winding of the present utility model when full capacity is moved;

Fig. 2 a is the wiring construction figure of high pressure winding of the present utility model when low capacity moves;

Fig. 2 b is the wiring construction figure of low pressure winding of the present utility model when low capacity moves.

Embodiment

Shown in Fig. 1 a and Fig. 2 a, it is set to delta connection and star-star connection by reversing switch respectively when full capacity operation and low capacity operation for A, the B of the utility model change magnetic flux capacitance-adjustable transformer, C three-phase high-voltage winding.

Shown in Fig. 1 b and Fig. 2 b, a, b, c three-phase low pressure winding that the utility model becomes the magnetic flux capacitance-adjustable transformer are divided into one section minority wire turn section 1 and two sections most wire turn sections 2,27%, two section most wire turn section that the number of turn of minority wire turn section accounts for three sections totals number of turns account for 36.5% of three sections totals number of turns respectively.

The utility model in the course of the work, the high pressure winding of transformer is connected into triangular structure under normal load, two sections most wire turn sections parallel connection of low pressure winding is connected with one section minority wire turn section again, here transformer full capacity operation, the same scope that goes for load factor from 0 to 100% with common transformer; The high pressure winding of transformer is a star structure by the reversing switch changing-over when hanging down load (load factor is less than 40%), three sections all series connection of low pressure winding, and this moment, the rated capacity of transformer was 1/3 of a full capacity.Because when big capacity is adjusted to low capacity, the number of turn of low pressure winding increases, and the high pressure winding becomes star connection and the phase voltage reduction simultaneously, and the multiple of the increase of the number of turn and voltage reduction is suitable, so the no-load voltage ratio of transformer is identical under two kinds of connected modes, can guarantee that output voltage is constant.Because 1/3 the when rated capacity in low capacity when operation is full capacity, the base value that calculates specified resistance is equal substantially, so the short-circuit impedance percentage value equates substantially when the short-circuit impedance percentage value moves with full capacity during the low capacity operation.

Claims (1)

1, a kind of change magnetic flux capacitance-adjustable transformer, include three-phase high-voltage winding and three-phase low pressure winding, it is characterized in that: the high pressure winding is provided with reversing switch, the three-phase high-voltage winding is that triangle connects on a station of reversing switch, on another station of reversing switch, the three-phase high-voltage winding is Y-connection; Each of low pressure winding is formed by three sections, and one section is minority wire turn section, accounts for 27% of three sections totals number of turns, and other two sections is most wire turn sections, accounts for 36.5% of three sections totals number of turns respectively; The low pressure winding also is provided with reversing switch, connects with one section minority wire turn section after two sections most wire turn sections parallel connection on the station of reversing switch again, and three sections windings are all connected on another station of reversing switch.

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