DE1588373A1 - Device for measuring the generator load - Google Patents

Description

Apparatus for Measuring Generator Load The invention relates to a device for measuring the load on a generator to prevent this is overloaded during use.

For measuring the generator load, with single or multi-phase current @ delivering generators it is already known ii load circuit for to provide a special ammeter for each phase.

The sum of the displayed currents gives the amount of the total load. From the comparison of this actually measured total exposure with the maximum permissible Generator load can then be seen whether the generator can still be loaded is or not.

Such an I: eat with several measuring devices is on the one hand proportionate costly and, on the other hand, often result from the necessary computation processes Misjudgments. This is especially true when there is one generator at the same time Both 380 V three-phase current and 220 V single-phase alternating current can be drawn @, since in this case further conversions of the read values are necessary, which, however, usually cannot be solved by using a generator.

The invention has therefore set itself the task of reducing the generator load Measure ru with just a single measuring device, regardless of whether it is a three-phase or alternating current tap is connected.

Any 8011 Reohenarbeit with the reading of the measuring device not be connected.

To solve this problem, it is proposed that one be in the load circuit Current transformers in series with one phase of the three-phase network and parallel to the secondary winding of the current transformer to switch a measuring device (voltmeter or amperementer).

Parallel or in series on the secondary winding is advantageous of Current transformer or to the measuring device a resistor for adjusting the Keßgerätes arranged. The current transformer can advantageously have a tap on its primary winding 1: 3 for the single-phase load.

It is advantageous to have a current transformer in series with all phases of the power grid switched and their secondary windings on the one hand with each other and on the other hand with a rectifier of the bitrides. The measuring device is then parallel to the rectifier or arranged between rectifier and secondary winding.

Further details are more preferred from the exemplary circuit diagrams Embodiments recognizable.

Fig. 1. is a circuit diagram showing a current transformer connected in parallel with Resistance and measuring device are connected in series to one phase of the three-phase network and a tap for single-phase load is provided on the primary winding.

Fig. 2 is a circuit diagram in which, in series with all of the three phases of the Power grid is connected to a current transformer and the secondary windings via one Rectifiers are connected to each other.

FIG. 3 shows a circuit diagram similar to that of FIG. 2, with the measuring device however, it is connected between the rectifier and the secondary winding.

The generator shown in the circuit diagrams has three generator windings 1, 2, 3 for phases R, S and T. The center conductor is designated with MP.

In the circuit diagram according to FIG. 1, a current transformer is in series with phase R. 4, which has a primary winding 5 and a secondary winding 6. At the primary winding 5 is provided with a tap 7 for the single-phase load. Parallel A load meter 8, in the example a voltmeter, is connected to the secondary winding 6.

Instead of a voltmeter, however, an ammeter can also be used will. Furthermore, a resistor 9 is arranged parallel to the load meter 8, with the Help adjusting the load meter B according to the kilovolt ampere of the Generator is possible.

At the load meter 8 the given electrical power can be measured of the generator that is attached to the terminal connections when a three-phase current collector is excluded R 400, S and T occurs. Likewise, on the same load meter 8, the delivered see electrical power when connecting AC current collectors to the Terminal connections R 230 and MP occurs. When connecting three-phase and With pantographs, the load meter 8 shows the total load on the generator. It is advantageous not to read the real volts or amperages on the load meter, but the device is equipped with a reading scale, where the to be read off Values indicate a percentage of the maximum permissible load.

In the circuit diagrams of FIGS. 2 and 3 are in pure form for each phase R, S and T each have a current transformer 10, 11 and 12 connected.

The secondary windings 13 of each of these current transformers are on the one hand connected to one another and, on the other hand, to a rectifier 14.

Following the example of the wig. 2 is a load meter 15 in parallel with the rectifier 14, while according to the example of FIG. 3, the load meter 15 between the Rectifier 14 and the ends of the secondary windings not connected to the rectifier 13 is connected.

In this case too, de @ load meter 15 shows the actual load of the generator, regardless of whether power is drawn from only one phase or whether a three-phase current collector is connected. of course it is also possible for everyone the primary windings of the three current transformers 10, 11 and 12 have a corresponding tap the circuit diagram according to FIG. 1, in order to also here again alternate current collectors to be able to connect.

In all cases, a single load meter is sufficient to safely and without special arithmetic process to be able to assess whether the generator is to be further loaded is- or not.

Claims (4)

P a t e nta n s p r ü c h e 1. Device for measuring the generator load, characterized in that a current transformer (4) in series with one in the load circuit Phase of the three-phase network and parallel to the secondary winding (6, 13) of the current transformer a measuring device (8, 15) (voltmeter or Mrtperemeter) is connected. 2. Apparatus according to claim 1, characterized in that parallel or in series with the secondary winding (6) of the current transformer t4) or with the measuring device (8) a resistor (9) is arranged for adjusting the measuring device. 3. Apparatus according to claim 1, characterized in that the current transformer (4) a tap (7) on a primary winding (5), preferably in a ratio of 1 : 3, for the single-phase load. 4. Device according to one of claims 1 to 3, characterized in that that in series with all phases (1, S,) of the power network a current converter (4) is connected is, the secondary windings (13) on the one hand with each other and on the other hand with a Rectifier (14) are connected, and that a measuring device (15) parall @ to the rectifier (14) or between rectifier (14) and secondary windings (13) is connected.