DE655407C - Short circuit device on automatic carbon pressure voltage regulators - Google Patents

Description

Short-circuiting device on automatic carbon pressure regulators A known type of electrical voltage regulator is used as a regulating member a column made of carbon disks that are exposed to alternating pressure and thereby changes its resistance within very wide limits. the stronger the the pressure on the column, the smaller the resistance. The resistance this column can never be reduced to zero even when high pressures are used. The resistance remaining as a minimum value can in certain cases be disruptive Role-play. This is particularly true when the coal column is in the feed lines is arranged to a consumption network, for the purpose of always the excess of the supplied Destroy voltage above the setpoint of the light voltage. When the incoming The voltage temporarily drops to or below the line voltage value, so there is a voltage drop in the coal column, which lowers the voltage even more, extremely undesirable.

It has already become known in such systems, the remaining ones To make the minimum resistance of the carbon column harmless by short-circuiting the column.

If the short circuit of the Position of the regulator magnet armature and thus fully the level of the regulated voltage made dependent, there is a risk of oscillation because the short circuit causes the regulated voltage due to the sudden disappearance of the column voltage drop increases and can cause the short circuit to be canceled again. The danger of a However, oscillation would not exist if the short-circuiting device as with known Arrangements controlled by a voltage independent of the regulated voltage would, so z. B. by the supplied voltage, because in this case the controlling Voltage is not changed by the short-circuiting process. This path requires however, the use of a magnet whose attracting and releasing voltages are very close lie next to each other and must also be adhered to very precisely. This difficulty does not exist if you short-circuit through the regulator magnet armature in the way can be accomplished; that the armature makes contact at the end of its compression stroke closes, which either directly carries out the short-circuiting of the coal column or brings a relay executing the short circuit to attract. In this solution there is however, as stated above, there is a risk of oscillation.

The present invention now relates to a short-circuiting device on automatic carbon pressure regulators, which the regulating carbon column at the end the working stroke of the regulator's magnet armature at which it is exposed to the greatest pressure is, short-circuits, and in which the risk of undulation is nevertheless avoided. According to the invention will simultaneously with the column short-circuit the response voltage value of the controller, i.e. the value to which the controller seeks to regulate the voltage to be regulated and if it is adhered to, only the; Regulator remains in equilibrium, do the same The amount by which the regulated voltage suddenly increases due to the short-circuiting of the column increases. Then, even after the column is short-circuited, the regulator will be in equilibrium again and not give rise to any fluctuations in tension.

Fig. Z shows an embodiment of the invention. With the clamps A is supplied with a voltage that fluctuates within certain limits. Before these The lighting network B should be protected against fluctuations. For this purpose is in series The regulating coal column C connected to the lighting network, which is compressed by the spring D. and is relieved more or less by the magnet E. The solenoid F is connected to the supply lines to lighting network B. The higher the mains voltage the more the magnet E pulls, the more the column C becomes mechanical relieved and the more tension it destroys as a result of its increased resistance. In this way, the mains voltage remains unchanged regardless of the fluctuations in the supplied Voltage A and always the same for all luminous flux quantities.

If a battery G is connected to the supply lines, the has the purpose, if the voltage A fails, the lighting network second with electricity supply, then the one in the coal column C would also be completely compressed any remaining resistance causes an undesirable voltage drop and in the lighting network cause a disruptive reduction in brightness.

For this reason, the carbon column C is provided with a short-circuiting device T, K, the contacts of which are closed by the regulator magnet armature L in its end position. As soon as the magnet armature L has reached its end position and thus the column resistance has reached its lowest value as the voltage A falls, the contact spring I is pressed against the contact piece K by the armature L. As a result, the disruptive voltage drop in the coal column disappears, and the lighting network B receives the undiminished voltage of battery G.

When the column resistance becomes zero as a result of short-circuiting, the voltage to be regulated suffers a sudden increase. If this is so great that the regulator reacts to it and tries to eliminate it again, the control mechanism will leave its end position again, lifting the column short circuit, whereupon the regulated voltage drops again and the control mechanism gelungsmechanisinus again in its end position @ l, r @ 'sngt. This would restore the column @:, tt @, - closed, and the game would go by -lieil.em start. According to the invention, when the coal column is closed with resin, the setpoint value of the regulated voltage is increased by a certain amount. This happens because, at the same time as the short circuit on the controller's magnetic circuit, a negative number of ampere-turns is added, which means that the magnet excitation (i.e. the voltage to be regulated that generates the magnet excitation) must increase by so much that the newly added negative ampere-turn amount is canceled again. The regulator mechanism only comes to rest again when this condition is met.

The negative Arnper windings to be generated during short-circuiting come in the present embodiment in that the short-circuiting Line 1I instead of immediately after the other pole O over a few turns Jl 'des Control solenoid is performed. The current flowing in it weakens the magnetic flux and prevents the armature L from being tightened again. as mentioned, with an ampere-turns in the low-voltage coil that is so much higher F (i.e. with a correspondingly increased light voltage) into equilibrium than through the power coil N ampere-turns are added in the negative sense.

If the voltage between terminals A exceeds the value again, in which the armature L under the action of the low-voltage coil F and the Power coil N begins to move, so the short circuit of column C is again canceled, and the lighting network voltage B suddenly drops by the amount of the voltage drop in the carbon column C. At the same time, however, the magnetically weakening short-circuit current disappears in the coil 1N, and thereby the magnetic force is increased so much that the Armature L, despite the weakening of the current in the low-voltage coil F, does not return to his Returns to the initial position and does not make the short circuit again.

Instead of the short-circuiting device T, Ii directly through the regulator magnet armature By pressing L, the anchor movement can also be used at the end of your Hubes to close an auxiliary contact that switches on a relay, which in turn short-circuiting the coal column. Instead of the short circuit the coal column could also be completely eliminated from its circuit will.

The negative to be added during short-circuiting on the regulator magnet Ampere turns could instead of the high current of the short-circuiting line section can also be generated by the weak current of the relay mentioned.

Claims (3)

PATENT CLAIMS: i. Short-circuiting device on automatic carbon pressure regulators, which short-circuits the regulating carbon column at the end of the working stroke of the regulator's magnet armature at which it is exposed to the greatest pressure, characterized in that the response voltage value of the regulator (E, D, L, C) around the same at the same time as the short-circuit The amount by which the regulated voltage (B) suddenly increases due to the short-circuiting of the carbon column (C) is increased. 2. Short-circuiting device according to claim i, characterized in that the increase in the response value of the controller (E, D, L, C) is brought about by the fact that with the short-circuit on the controller magnetic circuit (E, L) additional negative ampere turns (N) come into effect. 3. short-circuiting device according to claims i and 2, characterized characterized in that the negative regulator magnet ampere turns (N) through the current of the line section (M), which short-circuits the carbon column (C) causes.