DE553303C - Frame closure protection for machine units, especially for Ljungstroem units - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
June 24, 1932

REICH PATENT OFFICE

PATENT LETTERING

M 553303 CLASS 21c GROUP

Patented in the German Empire on March 29, 1929

The invention relates to a frame closure protection for machine units, for. B. for Ljungström units in which the prime mover drives two generators, which as a result the mechanical arrangement always run synchronously and switched on and off together will. According to the invention, the star points of both generator windings are to detect the frame closure via a Inductance (e.g. choke coil or transformer) connected to each other, their center point is grounded. It is advantageous to connect the star points of both generator windings via the primary winding of a transformer, the center of which is indirectly via a resistor (ohmic, inductive or z. B. also converter) or is directly grounded. In the event that you are the focus the primary winding of this transformer is grounded through a resistor, one closes according to the invention, the two secondary winding halves of the transformer directly so short in itself that when the frame is closed, i.e. opposite in the primary winding halves flowing currents, a current flows in the secondary circuit. In the event that the The center of the primary winding is directly grounded, according to the invention, the two secondary winding halves so short via a resistor that when the frame closes a current also flows in the secondary circuit.

If you consider the resistance between the midpoint of the primary winding of the transformer and earth, then according to the invention, the frame closing relay is connected in parallel with the resistor. But you can also do that Feed the frame closing relay from the two secondary winding halves of the transformer, that the relay when the frame closes, d. H. so in the opposite case in the primary winding halves flowing currents. A wattmetric relay can also be used to detect the frame closure, whose one coil of the total current lying in the common supply line Current transformer groups flowed through, while the other coil of the opposite Secondary winding halves connected in series between the two star points lying transformer is fed. With this circuit, the voltage coil can also be parallel to the one between Put the center point and earth connected resistor. It is also possible in the supply line to each generator to arrange current transformer groups that are connected in eight and to feed the current coils of the wattmetric relay from these current transformers.

If you put the center point of the primary winding of the transformer immediately grounded, it is useful to put the frame relay in series with a resistor

*) The patentsitcher named the following as the inventors:

Dr.-Ing. Robert Schimpf in Berlin-Schlachtensee and Dipl.-Ing. Hermann Keugebauer in Berlin-Spandau.

553803

of the two secondary winding halves of the transformer connected in series in opposite directions to dine out. Of course, you can also use the frame closing relay in parallel to the resistor located in the secondary winding of the transformer.

The drawing shows exemplary embodiments of the invention. According to Fig. Ι are the winding star points of the two generators 2 and 3 via the primary winding of the transformer 4 connected to one another, the center of which is grounded via a resistor 5 is. The secondary side of the transformer consists of the two winding halves 41 and 42, which are connected in series in opposite directions.

According to Fig. 2, the center point of the transformer's primary winding is immediate grounded, and the secondary winding halves 41 and 42 are connected through the resistor 6 shorted.

Fig. 3 shows an embodiment in which the secondary winding halves 41 and 42 the frame closing relay 7 feed, while the center point of the primary winding is grounded via the resistor 5.

According to Fig. 4, one coil of the wattmetric relay 8 is from the current transformer group 9, while the other coil is parallel to resistor 5. The wattmetric Relay 8 is switched so that it responds when the frame closes, i.e. when the total current in the current transformer group 9 Is zero.

In the embodiment according to Fig. 5, one coil of the wattmetric relay 10 is from fed to current transformer groups 11 and 12, while the other coil is parallel to the resistor 5. The wattmetric relay is switched in such a way that it responds when the frame closes, i.e. when between the eight switched Current transformer groups 11 and 12 a total current flows.

According to Fig. 6, the frame closure relay 13 is in series with the resistor 14 of the secondary winding halves 41 and 42 of the transformer 4 are fed while the center point the primary winding is directly grounded.

According to FIG. 7, on the other hand, the frame closing relay 15 is parallel to the resistor 14 fed by the secondary winding halves 41 and 42 of the transformer 4. 55

Claims (7)

Patent claims: i. Frame closure protection for machine units in which the prime mover drives two generators, which are always synchronous due to the mechanical arrangement run and switched on and off together, especially for Ljungström units, characterized in that the star points of both generator windings are connected to one another via an inductance (e.g. choke coil or transformer), the center of which is grounded and that the effects of the two generators in the frame closure Add fault currents to the frame leakage relay to a greater overall effect, for example by that the relay depends on the geometric difference in the two halves of the winding fault currents flowing through the inductance or the current flowing through the earth connection of the center of the inductance being affected. 2. Frame closure protection according to claim 1 or the following, characterized in that that the center of the primary winding is grounded via a resistor and the both secondary winding halves of the transformer are directly short-circuited in such a way that when the frame is closed, d. H. i.e. with currents flowing in opposite directions in the primary winding halves, a current flows in the secondary side which is used to excite a frame closing relay serves. 3. Frame closure protection according to claim 1 or the following, characterized in that that the center of the primary winding is directly grounded and the two Secondary winding halves are short-circuited in itself via a resistor that when the frame is closed, d. H. so in the Primary winding halves oppositely flowing currents, one current in the secondary circuit flows. 4. Frame closure protection according to claim 1 or the following, characterized in that that a wattmetric relay is used to detect the frame closure, whose one coil of the total current lying in the common supply line Current transformer is traversed, while the other coil of the oppositely connected in series secondary winding halves of the transformer lying between the two star points is fed. 5. frame locking protection according to claim 1 or the following, characterized in that that a wattmetric relay is used to detect the frame closure, whose one coil of the total current lying in the common supply line Current transformer is flowed through, while the other coil is parallel to the one between the center of the primary winding ment and earth connected resistor. 6. Frame closure protection according to claim ι or the following, characterized in that that a wattmetrical relay is used, one coil of which is connected to the one in the supply line current transformer groups connected in eight connected to each generator. 7. frame closure protection according to claim 1 and 4, characterized in that the Frame closure relay in parallel with the one located in the secondary circuit of the transformer Resistance lies. For this purpose ι sheet of drawings