CN2240192Y - Composite characteristic three-phase power transformer - Google Patents

Abstract

The utility model relates to a power transformer. The utility model is characterized in that an impedance coil is connected in series on a secondary coil, and the utility model has taps. According to the different voltage, the impedance coil can be connected with the different taps through a linked switch controlled by a voltage detector. When the different voltage is input, the same voltage can be output. The transformer has compound characteristics of flat, hard, and steep descent. When a motor is started, the damage of the strong magnetic field caused by the strong current for the transformer can be avoided. The manner of changing high voltage can be also utilized. That other persons utilize the manner of suspension lines to go on with stealing electricity is avoided. The transformer is suitable for dragging one motor or two motors directly, such as supplying an oil pumping machine with electricity.

Description

The composite attribute three-phase power transformer

The utility model relates to a kind of power transformer.

Usually the high-tension electricity by transformer station's output is transported to power transformer through overhead wire, becomes low tension after electric cabinet and overhead route are sent to each power device by transformer.At the oil exploitation scene, oil well is dispersed in the field, and distance is far away between each oil well, and general one or two mouthful of oil well just needs the special transformer that is equipped with.Because field condition and load character require the motor full voltage starting again, electric current alters a great deal during each electric motor starting, and general transformer only has flat hardware features, voltage descended seldom when electric current increased, in transformer, can produce powerful changes of magnetic field, bring very big impact to transformer, for some bigger motors, start difficulty especially, also can damage transformer when serious.In addition, because oil well is dispersed in the field, the also frequent employing of some lawless persons mode of hanging wire on the trolley wire of high-pressure side or low-pressure end is sneaked current, make the serious overload operation of electric power system, have a strong impact on the oil pumper operate as normal, what have also can burn out motor, transformer or other power consumption equipment.

The purpose of this utility model is in order to design a kind of power transformer, makes its output characteristic can adapt to the feature that pumping unit of well starts, and promptly has flat hardware features during less than certain value when electric current, and electric current has steep drop characteristic during greater than certain value.And when from the different high-tension electricity of the input of transformer input, can obtain identical voltage, not influence the operate as normal of power consumption equipment from output.

The technical solution of the utility model is to realize like this, a kind of composite attribute power transformer, by shell, be installed in binding post on the shell, iron core in the enclosure be installed, primary coil and the secondary coil that is installed on the iron core constitutes, its special character is: (1) is in series with reactance coil on each secondary coil, make the reactance voltage of its generation opposite, and the induction reactance magnetic flux that produces have the effect that strengthens the transformer main flux with the voltage of secondary coil.(2) on each secondary coil, has tap.(3) voltage detector is connected with secondary coil and voltage change-over switch respectively.

In above-mentioned technical solution, its special character is that also its iron core is a sphere of movements for the elephants shape iron core.

The utility model has the advantages that this transformer has flat composite attribute of falling two specific characters firmly and suddenly; promptly when electric motor starting; transformer operates in the steep drop characteristic district under the bigger situation of electric current; it is more that voltage descends; can limit the electric motor starting electric current effectively; can avoid producing in the transformer very big impulsive force, the protection transformer exempts from damage.When motor normally moved, electric current was less, and transformer operates in the flat hardware features district, and voltage does not descend substantially.The utility model also has can import several different high-tension electricities, and output voltage remains unchanged, thereby can change input voltage arbitrarily, gives and adopts the people of high-pressure side hanging wire power stealing to cause threat.

Fig. 1 is installed in structural representation on the iron core for the utility model coil.

Fig. 2 is the utility model conspectus.

Be described further below in conjunction with accompanying drawing:

The iron core 1 of transformer adopts sphere of movements for the elephants shape iron core, make of silicon steel sheet or other magnetic materials, reactance coil 4 is installed on three iron core column on the upper strata of sphere of movements for the elephants shape iron core 1, on three iron core column of its lower floor, be separately installed with primary coil 2 and secondary coil 3, head end A, the B of three primary coils, C are the input of transformer, and its three ends interconnect.The end of secondary coil 3 and reactance coil 4 are in series, its method of attachment should be able to make its induction reactance voltage that produces have the effect that reduces the transformer output voltage, make the induction reactance magnetic flux that it produced have the effect of strengthening the transformer main flux simultaneously, promptly help increasing the effect of transformer output voltage.Three head end a1, b1 of secondary coil 3, c1 are output, on three secondary coils, have tap a2, b2, c2 respectively (as required, can be two taps or a plurality of tap), also can be used as output, voltage detector 5 connects with the output (comprising each tap) and the linked switch 6 of a secondary coil of transformer respectively mutually by lead.The effect that reduces the transformer output voltage is arranged, the induction reactance magnetic flux that is produced simultaneously has the effect of strengthening the transformer main flux, help increasing the effect of transformer output voltage, when design, can adjust the transformer output characteristic by the number of turn, reactive iron core area or the iron-core magnetic gap of adjusting reactance coil, make it have the composite attribute of comparatively ideal flat hardware features and steep drop characteristic.On producing well, use this transformer to drag the motor of oil pumper; during startup; because electric current is very big; transformer is in the steep drop characteristic state, and the voltage that is added on the motor is lower, can reduce the starting current of motor effectively; also just reduced the suffered the action of a magnetic field power of Transformer Winding; with the impact of starting current to electrical network, can protect transformer effectively, make its unlikely being damaged.In start-up course, along with the rising gradually of motor speed, electric current reduces gradually, and the output voltage of transformer also raises gradually, and motor changes normal operation over to, and this moment, the output characteristic of transformer was in flat hardware features state.Therefore utilize the composite attribute of this transformer, the condition of " soft start " is provided for motor.

The voltage signal that this transformer measures by the voltage comparator in the voltage detector can make the tap of linked switch 6 automatic conversion outputs according to different voltage, guarantees that output voltage is a determined value, satisfies the needs that motor runs well.In fact voltage detector is exactly a voltage comparator, it adopts prior art, the employing NAND gate circuit form of introducing in voltage comparator of introducing in " Basic Analog Electronics " of writing as Higher Education Publishing House's in June, 1985 publication, Ying Qiaoqin etc., first of " the practical electronic circuit complete works " that Electronic Industry Press's publications in 1987, Wang Gan etc. write is carried out voltage ratio or the NAND gate of introducing and the voltage comparator circuit of time-base circuit (being commonly called as 555 integrated packages) composition etc. in second of this book.Therefore utilize this device, can be regularly or not timing change the input voltage of transformer, and do not influence the output voltage of transformer, but can cause very big threat for the power consumption equipment that adopts the hanging wire mode from the high-pressure side power stealing, thereby avoid the lawless person to adopt the possibility of hanging wire power stealing from high-pressure side.When transformer directly drags oil pumper, can directly electric power be delivered on the motor by cable from transformer, do not need by power distribution cabinet and overhead wire, can avoid the lawless person to adopt the mode of hanging wire to sneak current, can guarantee that motor has enough electric power from low-pressure end.

Claims (2)

1. composite attribute power transformer by shell, be installed in binding post on the shell, in the enclosure iron core (1) is installed, is installed in primary coil (2) and secondary coil (3) formation on the iron core (1), is characterized in that:

(a) on each secondary coil (3), be in series with reactance coil (4);

(b) on each secondary coil (3), has tap;

(c) voltage detector (5) is connected with secondary coil (3) and voltage change-over switch (6) respectively.

2. composite attribute three-phase power transformer according to claim 1 is characterized in that: its iron core (1) is a sphere of movements for the elephants shape iron core.

Images