SU1221613A1 - Digital phase meter for measuring instantaneous value of phase shift angle - Google Patents

Abstract

The invention can be used in distribution networks of mining enterprises. The device contains shapers 1 and 2 pulses, triggers 3 and 4, elements 5 and 6 of implication, generator 7, elements 8 and 9 coincidence, element 10 IL and counter 11. Introduction to the phase meter of two elements of implication and element OR allowed to measure instantaneous shift values phases, not only as the angle of phase shift increases, but to decrease the phase shift with passing through zero values, 1 l. "(To to cd go

Description

The invention relates to measurement, in particular to devices for measuring phase shift, and can be used in distribution networks of mining enterprises for measuring the instantaneous value of the phase angle.

The purpose of the invention is to expand the functionality of the phase meter's capabilities to measure the instantaneous value of the phase angle by introducing two implication elements into the phase meter, which made it possible to measure the instantaneous phase shift values not only as the phase shift angle increases, but also to decrease the phase shift through zero values.

The drawing shows the structures of a digital phase meter for measuring the instantaneous value of the shift angle

The proposed device contains the first and second shaper 1 and 2 pulses, the first and second triggers 3 and 4, the first and second elements 5 and 6 of the implication, the generator 7, two elements 8 and 9 of the match, the element 10 OR and the counter 11.

In this case, the first phase meter input through the first shaper 1 connected in series, trigger 3, implication element 5, coincidence element 8 is connected to the first input of element 10 OR.

The second phase meter input is similarly through the second shaper 2 connected in series, trigger 4, implication element 6, coincidence element 9 connected to the second input of element 10 OR, the output of which is connected to the input of counter 11. The second inputs of matching elements 8 and 9 are connected to the output of generator 7, and the second inputs of elements 5 and 6 of the implication are connected to the output of the second trigger 4 and to the output of the first trigger 3, respectively.

The device works as follows.

The inputs of the formers 1 and 2: pulses receive signals for which the difference in the phase angle is determined. The formers 1 and 2 produce square-shaped pulses that, from the outputs of the formers 1 and 2, arrive at the counting inputs of the triggers 3 and 4, respectively. Since due to the lag of one of the input signals from the other, the flip-flops are set to one 21,613. 2

Otherwise, the potentials at their outputs are not simultaneous. connected to the inputs of elements 5 and 6 of the implication, appear with some

J lag time equal to the difference of the phase angle. Elements 5 and 6 of the implication work in such a way that when there is a potential at the first input corresponding to the logical unit, and at the second input there is a potential corresponding to the logic-. to zero, the output is set to a potential corresponding to a logical one. Therefore

15 a pulse appears at the outputs of elements 5 and 6, equal in duration to the difference in the phase angle. If the pulse from trigger 3 advances in time the pulse of trigger 4, then a 2Q pulse appears at the output of element 5. If the pulse from trigger 3 lags behind the pulse from trigger 4, then an output pulse of element 6 appears. the outputs indicated

The 25 elements of the pulses arrive at the inputs of elements 8 and 9 of coincidence and open one of them. Through an open element, the pulses from the generator 7 of the exemplary frequency post2Q are fed to the input of the element 10 OR, and from the output of the latter to the input of the counter 11. The number of pulses transmitted from the generator 7 through the element is simultaneous. falling on the input of the counter 11, can be calculated by the formula

five

KH f-.

five

where t is the duration of the pulse produced by the elements 5 and 6 of the implication;

f is the generator frequency of the reference frequency.

The frequency of the input signal is 1/360 the proportion of the reference frequency.

The application of the proposed phase meter permits monitoring the phase changes both with an increase and with a backing angle of phase.

50

Claims (1)

Invention Formula A digital phase meter for measuring the instantaneous value of the phase angle, containing the first and second pulse shapers, the first and second triggers, the first and second coincidence elements connected to an exemplary frequency generator, and a counter different 3 1221613 4 by the fact that, in order to expand the functional and second implication elements, the secondary capabilities, in inconsiderable inputs of which are connected to the first and second element outputs of the second trigger, and the outputs of the implication, are the OR elements, and the second inputs of the first and second forms of the 5 and Dami of the first and second elements of the pulse bodies are connected respectively, the outputs of the first and second stages of the first and second elements of the match are connected to the flip-flops, the output of the first triggers of the element OR, the output D of which is connected to the first inputs first connected to the input of the counter.