DE455410C - Method for displaying the product of several variable quantities - Google Patents

Description

Method of displaying the product of several variable quantities. If a current proportional to a quantity b is allowed to flow through a resistor proportional to a quantity a, the voltage loss across the resistor is proportional to the product a - b. One can therefore measure the voltage across the resistor and thus the product a - b with a voltmeter, if the current and resistance are regulated accordingly. In this way, products made up of three or more factors can also be measured. For example, if one makes the current I proportional to the factor a in Fig the voltage drop at the `" forcing bl ', R and the current in R and the voltage loss in r where C is a constant of proportionality. The voltage drop at r- is therefore a measure of the product a # b - c.

One can also measure the product of several factors in the manner illustrated in FIG. The resistance TV is constant. the resistance R is made inversely proportional to the factor a and large towards 9 ', and the current I flowing through the branch 11T, R is directly proportional to the factor b. In this case the current i. in resistance R So you can see the division of an ammeter, which measures the current i. measures, number directly with the product a - b .

This last-described method leads to the fact that a voltage E proportional to a factor b can also be connected to a resistance R which is inversely proportional to the factor a in order to obtain the current in R proportional to the product a - b .

The regulation of the various currents, voltages and resistances, which should be directly or indirectly proportional to the factors concerned be done manually or automatically by appropriate control mechanisms, as described in the exemplary embodiments mentioned below.

The invention described above is suitable for example and in particular good for measuring the volt-ampere product in electrical lines. Let’s how this is indicated in Fig. 3, through the resistance Ti 'the operating current I or a proportion proportional to it flow and closes a clamping knife with one terminal to one end of W while the other terminal of the voltmeter is connected to a sliding contact sliding on W, so you can through the sliding contact set the partial resistance R proportional to the operating voltage E. Is the voltmeter sufficiently sensitive, d. H. the current flowing in it is negligibly small against the operating current I or the part proportional to it, it becomes the Voltage I # R = K # I # E, i.e. the volt-ampere product, is displayed. The setting of the sliding contact can be done manually according to the specifications of another voltmeter or automatically by the last-mentioned voltmeter controlling the setting. Advantageous in this case the application of current transformers is proportional by adding the secondary burden the operating voltage is changed, thereby reducing the secondary terminal voltage of the converter becomes proportional to the voltamper product.

The volt-ampere product can also be measured by applying a current path from the resistor R containing an ammeter to the operating voltage E and setting R to be inversely proportional to the operating current I. In this case the ammeter measures a current thus also the volt-ampere product. Here, too, the setting of R can be done by hand using a different ammeter, but which is best with is quantified. But you can also use this latter instrument as a control instrument for automatic adjustment. Voltage converters can of course also be used here, so that the volt-amperes are measured on the secondary side of these converters.

Claims (4)

PATENT CLAIMS: i. Method of displaying the product of several variable Sizes, characterized in that a current proportional to a quantity (b) in a resistance proportional to a second quantity (a) generates a voltage loss, which is proportional to the product of both quantities (a and b) and by a voltmeter is measured, or by the fact that the current is inversely proportional to a quantity (a) Resistance applied to a voltage proportional to another quantity (b) is how the product of the two quantities (a # b) changes and of a corresponding one Ammeter is measured. 2. The method according to claim i, characterized in that that the currents and voltages that are directly or indirectly proportional to the variable quantities and resistances are set by hand according to the specifications of special display instruments will. 3. The method according to claim i, characterized in that the variable Quantities directly or indirectly proportional currents, voltages and resistances through special instruments can be set and controlled automatically. 4. Application of the method according to claims 1, 2 and 3 for displaying the volt-amperes in electrical AC power lines.