DE579809C - Control device for autotransformers with taps - Google Patents

Description

GERMAN EMPIRE

ISSUED AIH JULY 1, 1933

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 d ² GROUP 53

Allgemeine Elektricitäts-Gesellschaft in Berlin *) Control device for autotransformers with taps

Patented in the German Empire on August 23, 1929

The peculiarity of autotransformers is that their supply and discharge lines (unregulated and regulated voltages) are connected to one and the same winding. This fact is used in a known manner to regulate the voltage by connecting windings to the contacts of a contact track and sliding the supply or discharge lines along this. Compared to such arrangements, a particularly simple design is obtained if, according to the invention, with η regulating stages and the use of only - tapping points

genes and contacts, the supply and discharge lines are swapped by means of a changeover switch. the Contact track is used for the entire control range run through twice, with either the lead or the lead firmly attached to the End of the regulator windings is connected while the other associated line is connected to is guided along the contact path. The switchover takes place after the first time Run through the contact path, so that when you run through it again in the opposite direction, a control the tension takes place in the same sense as before. With consideration for as much as possible low iron and copper losses is best used to the outer end of the winding Connection of lines selected. The switchover must be uninterrupted so that can and must of course be regulated under load when translating the Transfprmatorenseiten of 1: 1 so that there are no short-circuited turns. To the -· The changeover switch expediently saves cables and special insulators attached to the bushing insulators.

But despite the two directions of movement for one and the same sense of regulation One can see that having a clearly acting adjusting device for regulating higher and lower Gear reversing gear before, which is also reversed when switching the incoming and outgoing lines, whereby the Movement of the sliding contacts reverses without the driving crank of the reversing gear needs to change its direction of rotation. This process can be carried out with an electrically operated Control mechanism without reversing gear by simply reversing the direction of rotation of the drive motor, i.e. by interchanging two poles, cause .. The switching of the supply and discharge can also be electromechanical be made, including known facilities are used.

In Figs. Ia, ib, ic the regulating device is shown by switching the supply and discharge lines in connection with a sliding contact. It means a the winding of a phase of a three-phase transformer, further If ₁ to O _{5 are} the taps of the windings and C ₁ to C _{3 are} the contacts of the slideway connected to them. The inlets and outlets e and / are with their

*) The patent seeker stated as the inventor:

Karl Bölte in Berlin-Karlshorst.

one end to the bushings g and h and the other end to a changeover switch /, which is also connected to the lines k and I. The other end of the line / 5: slides with the sliding contact m along the contacts C ₁ to C ₅ ; the end of the line / is permanently connected to O ₁ . The sliding contact of

ίο C ₅ moved to C ₁ (Fig. ib). In this position, the changeover takes place at the changeover switch. Then the contact / «is shifted from C ₁ to C ₅ for further regulation (Fig. Ic),

In Fig. 2 the most important actuators are shown schematically. In the case of a manual drive, the hand crank «is used to drive the control device via the bevel gears q _x and r or q ₂ and r. A worm drive is. executed with a movable stop ^ and a fixed stop ^. These limit the movement in one and the other direction. The changeover switch is actuated by the rod ν with the drive lever W or a similar element. The engagement of the rod ν on the changeover switch is no longer shown illustrated position of the bevel gear regulates the tension is higher, is obtained initially when struck by t _x of I _2, the average voltage with the transmission ratio 1:. 1 in order to enable further rotation of the crank, "in the same direction of rotation, is then the ^one bevel gear is switched so that the wheel <7 ₂ comes into engagement with r . As a result, while maintaining the previous direction of rotation of the crank, the sense of control (upwards) also remains, although there is now a backward movement on the contact path of the changeover switch i shown in Fig. r made by the rod V, which in this case on this changeover switch and on the Ver adjusting fork ρ for the bevel gear engages. Fig. 2 also shows electromechanical! Drive those parts are shown which are also influenced by these processes and which are used to operate an auxiliary motor which, instead of the crank, can drive the control device. These are the actuation switch x, the changeover switch y and the changeover contactor 2 for switching the auxiliary motor in one of the two required directions of rotation. If the upward regulation is carried out by the auxiliary motor instead of the crank drive, the actuating switch χ is brought into one of the two switching positions. The current flows through the changeover switch y and switches the auxiliary motor on in the relevant direction of rotation through the switchover contactor 2. The auxiliary motor also acts on the drive shaft and thus on the worm drive with the stops t _x and t ₂ . If the middle position is reached again with the voltage ratio 1: 1, where t _± beats against έ ₂ , then, as already described above, the changeover of the switch / Fig. Ι is necessary for further regulation. This is done with simultaneous changeover of the direction of rotation of the auxiliary motor by means of the rod ν, either by hand or by a double-acting electromagnet.

Claims (8)

Patent claims: 1. Control device for autotransformers with taps, characterized in that in a switching position which corresponds to the transmission ratio 1: 1, by means of a changeover switch, the two connecting lines can be exchanged in pairs is provided, one of which is permanently connected to the winding of the transformer and the other is led to the taps of the transformer. 2. Control device according to claim 1, go characterized in that the exchange of the supply and discharge is only possible when the sliding contact is located on the contact of the contact track connected to the outer end of the control winding. 3. Control device according to claim 1 and 2, characterized in that the Changeover switch for interchanging the supply and discharge lines on the bushing insulators of the transformer is attached. 4. Control device according to claim 1 to 3, characterized in that the switch for interchanging the and derivation allows uninterrupted switchover. 5. Control device according to claim 1 to 4, characterized in that for Interchanging the supply and discharge a linkage is provided that with the Sliding contacts of the contact track is coupled in such a way that when the supply and discharge lines are interchanged, the direction of movement is at the same time the sliding contacts is changed along the contact path. 6. Control device according to claim 5, characterized in that with the linkage a gear change transmission is connected. 7. Control device according to claim 1 to 5, characterized in that at electrical drive of the contact device through the linkage, which swaps the supply and discharge lines, at the same time a switch is operated, which reverses the direction of rotation of the drive. 8. Control device according to claim 5 to 7, characterized in that the Rod, which reverses the supply and discharge, electromagnetic is operated. 1 sheet of drawings