SU601628A1 - Phase meter - Google Patents

Description

This invention relates to pulsed tech. It can be used in various phase-impulse systems and as a stand-alone device for measuring the phase angle of two AC voltages in a discrete form and obtaining information about the rate of change of the phase angle.

A phase meter is known that contains two meters, the outputs of which are connected to the arithmetic unit 1.

Such a phase meter is unreliable.

Closest to the proposed phase meter, which contains an input trigger connected to two elements AND, the other koipbix inputs are connected to a pulse generator, a counter and a reversible counter, as well as additional drivers, frequency dividers and an arithmetic unit.

The disadvantage of this phase meter is the impossibility of obtaining information on the rate of change of the phase angle and low reliability due to complexity.

The purpose of the invention is to obtain information on the rate of change of the shear angle and increase reliability.

The goal is achieved by the fact that a phase meter containing an input trigger connected to two AND elements, the other inputs of which are connected to the filling pulse generator, a counter and a reversible counter, has entered a counter code comparison node, a third And element and a form node. increment, the inputs of the third element And are connected with one output; the input trigger and the output of the counter code comparison node, and the output - with the counter zeroing input; the inputs of the increment node are connected to the corresponding outputs in ex elements and comparing the counters and node codes, and its outputs - For part down counter inputs, node inputs sra1vneni code counters are connected to the outputs of the bill. Chica n reversive counter. The NR is a node of the f.rmiriro.Ryrasche.Nyy node contains two triggers, each of which is connected to the elements And whose outputs are node outputs, the second inputs are connected to the outputs of the first and second elements And, respectively, the inputs of the first trigger are the output of the second element AND and the output of the comparison node of the counter codes, the inputs of the second trigger through the NAND element — with the output of the second element and with the output of the comparison node of the counter codes and with the output of the third element I.

The drawing shows a structural electrical circuit of a phase meter.

The phase meter contains an input trigger 1, elements AND 2 and 3, respectively, a generator 4 filling pulses, a counter 5, a reversible counter 6, a node 7 comparing the codes of counters, an element 8, a node 9 for p: r, world and wpH. consisting of AND elements 10, 11, triggers 12 and 13, and an element NOT 14.

Input T1rigger 1, which controls the elements 2 and 5, connected to the generator with its pulse 1 and half, and 4, the counter 5 and the reversible counter 6 form a known phase meter with a time-IM1-zero transform. The outputs of the counter 5 and the reversible counter 6 are; co-current with the inputs of the code comparison node 7, which outputs the code-match signal: in both counters. The output of the code comparison node, which is affected by the phase meter output at the speed of incrementing the phase shift angle, is connected to the input of the AND 8 element controlled by the input trigger and the input of the increment generation unit 9. The output of the element And 5 is connected to the input of the zeroing of the counter 5 and the unit 9 for the formation of increments. The outputs of the incrementing unit are connected to the input of the reversible counter 6. The incremental forming unit 9 contains elements And / (9 and 11, controlled by triggers 12 and 13, the outputs of which are outputs of node 9. These elements transmit pulses from elements And 2 and. Trigger 12 It is controlled by signals from AND 5 and a code comparison node 7. Trigger 13 is controlled via Element 14 by a signal from AND 5 and a code comparison node 7, and by a signal from AND 8 elements.

The phase meter operates as follows.

During each measurement cycle, equal to the period of the Reference voltage, the pulse generator 4 records the number of pulses in the counter 5 through the And 3 element proportional to the phase shift angle. At the same time, the counter code 5 is compared by the code comparison node 7 with the code (the reversible counter 6 is the result of a previous measurement. If, after the coincidence of the codes, the counter 5 is filled, the subsequent pulses go to the reversible counter, since the equal edge of the last pulse flips the trigger 13 and the And // element is prepared for passing subsequent pulses to the reversible counter 6.

If the codes do not match at the end of the filling of the counter 5, this means that the code of the reversible counter is larger and must be reduced. Therefore, the next impulse from the element 2 passes through the element I / C opened by the trigger 12 and writes off the unit from the reversible counter. The write-off continues until the pairs until the counter codes become the same. At this moment, node 7 generates a signal that goes through: triggered trigger 12 and closes element 10, and also inserts counter 5 through element 8. Thus, Oi6pa3OM, the same code is entered into the reversible counter 6, as in counter 5, the phase angle is continuously monitored. The pulses at the output of the incrementing node are formed at intervals of a multiple of the measurement cycle, and appear only when the angle of phase shift changes. Therefore, the frequency of their formation is proportional to the rate of change of the phase angle.

Invention Formula

Claims (2)

1. A phase meter containing an input trigger connected to two elements AND, the other inputs of which are connected to a generator of filling pulses, a counter and a reversible counter, characterized in that, in order to obtain information on the rate of change of the angle of phase shift and increase reliability, it is entered the counter code comparison node, the third AND element and the increment generation node, in which the inputs of the third element I are connected to one output of the trigger input and the output of the counter code comparison node, and the output to the zero reset input of the counter, ode irirascheny forming unit are connected to respective outputs of all the AND node and comparing the code counters, and its outputs - to the inputs of the reversible counter and, comparing the node inputs of counters codes connected to the counter outputs and the reversible counter. 2. Phase meter p. 1, characterized in that the unit for forming the increments contains two triggers; each of which is connected to the AND element, whose outputs are the node outputs, the second inputs are connected to the nepiBoro outputs and the second AND elements, respectively, and the inputs of the first trigger are connected to the output of the second AND element and the output of the counter code comparison node, BTOiporo inputs are the trigger element AND-NOT - with the output of the second element AND, with the output of the comparison node of the counter codes and with the output of the third element I. The source of information taken into account in the examination. 1. USSR Author's Certificate No. 402827, G01 R 25/08, 1973. P