DE2013636C3 - Control arrangement for the drive motor of a step switchgear - Google Patents

Description

person you would like button 61, and 6 S is analog, as well as the contactors dl and C2 are for the opposite direction of the motor operated Here takes place the compulsory stoppage of the engine by the actuation of the key b € entsprecher "d. As described above, the contactors c 3 and c4 are de-energized in this case too, so that the motor is stopped independently of the motor protection el. In contrast to known designs, the inventively provided

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end of the motor winding

1 sheet of drawings

Claims (1)

1 2 Destruction of connected devices Claim: can. The invention is based on the object Control arrangement for the drive motor step switchgear to create that with absolute Sieines Step-by-step switchgear, in which the stillness is forced to stop after each switching step of the drive motor is set by short-circuiting to cause serious malfunctions of the motor windings depending on the to be avoided. According to this, this is done with the help of Position of a button actuated by the motor shaft of a control arrangement for the drive motor sters takes place, characterized in a step switchgear, in which the Stillsetdaß one of the motor contactor (el) independent, the io tion of the drive motor by short-circuiting the Motor windings short-circuiting and equal motor windings depending on the position the power supply to the motor is interrupted in good time with a button actuated by the motor shaft, A corresponding contactor (c4) is provided, the elimination of which is achieved by the fact that a motor protection or excitation by means of the depending on giges, the motor windings short-circuiting and the position of the motor shaft actuated button 15 at the same time the power supply to the motor is under- (ft5) he follows. breaking contactor is provided, whose release or Excitation by means of the development of the motor shaft actuated button takes place. the The invention is described below using the circuit diagram ao des explained in more detail. The application relates to a control By pressing the button b 1 receives initially arrangement for the drive motor of a step switch- the motor contactor el voltage and responds. The Factory, in which the shutdown of the drive contactor el is maintained via the make contact c 1-1 motors by short-circuiting the motor windings themselves. This gives the coil of the brake contactor e3 depending on the position of one of the Mo- 15 via the contacts d 1-1 and rf 2-1 of the contactor relays rfl door shaft actuated button takes place. and rf 2 voltage. This means that the locking For the correct operation of a transformer contact3-0 also the brake contactorc4 with voltage tors with step winding, it is essentially occupied, so that the contacts c4-0 also close, Meaning that the one driving the tap changer whereupon the motor starts up. The motor drive and the control for this work exactly 30 After about a second, the contacts of the th. The motor drive has to ensure that the mechanically operated pushbutton ft 5 is opened or, with the aid of the step switch mechanism, each closed. The NC contacts ft 5-0 and 65-3 of the desired voltage level are set and the level star ft 5 work with a delay, so that the motor protection switchgear is initially shut down via a NO contact ft 5-1 after this voltage level el has been reached. Passing through the motor drive 35 and the normally closed contact b 5-3 of the button on the voltage and thus the tap changer is above all voltage until the contactor rf I over one of the voltage levels of the transformer can weigh heavily. Closing contact i> 5-2 of the button ft 5 tension will have consequences. To prevent such lays, responds and the power supply for the malfunction has therefore already been taken over in the control motor protection el. The voltage supply of the motor drive built-in timing relay, the 40 tion for the two contactors c3 and c4 now takes place after a certain set time on the Mo- exclusively via a closing conact 65-4 of the gate protection switch give a trigger pulse so that button ft 5, since the in the supply line to the two of the motor drive is de-energized. This normally closed contact rf 1-1 des contactors c3 and e 4 leads, among other things, to considerable auxiliary contactor rf 1 open and dci normally open contact difficulties if, for example, at a distance of 45 ft 5-4 the button ft 5 has closed.
After the step switch has switched to the new Spander switch-on of the motor protection switch only from voltage run, the button ft 5 hand is possible. in its original position; back, so that the voltage in the German Auslegeschrift 1 123 743 is a feed for the motor contactor el interrupted electric motor driven switching mechanism high 50 is. As described by the inevitable return of the number of stages, in which a contactor is provided for each Laufrich- button ft 5 in the starting position and the power supply of the motor, whose lead to the two contactors e3 and e4 is interrupted functionality for both the drive of the chen , these are de-energized, so that they drop the motor and responsible for its standstill and the contacts e4-0 of the contactor e4 open and is. The self-holding circuit of the contactors will close their contacts c4-l after 55, furthermore the contacts will be interrupted every switching process, a forced c3-l of the contactor c 3 will close and its auxiliary con-shutdown of the motor will only open after clock c 3-0 opens. As a result, the motor is disconnected from the mains, running through all stages by short-circuiting the and the motor winding at the same time as the kur / gc armature circuit. Accordingly, if the motors remain closed, so that the motor drive is mechanically stuck to a standstill, the motor will run automatically. The motor continues to run until it has reached the end position. impossible if, for example, the motor protection e 1 However, this possibility must initially get stuck with a drive, which can be completely excluded without the mechanically operated switch mechanism of the type mentioned above. If, for example, the power supply to contactors c3 and c4 is taken over by the tap changer of a transformer, the motor drive continues to run up to the highest voltage level, so that the tap changer would mean
If an impermissible increase in voltage occurs in the network. These can also be seen on the circuit diagram and have serious consequences, for example the ft 6 and ft 100 buttons, whose contact designation