CS248591B1 - Phase shift overrun indicator of two periodic waveforms - Google Patents

Abstract

The indicator of exceeding the phase shift of two periodic waveforms with the same frequency serves to signal the exceeding of the phase shift of two electrical waveforms, for example voltage and current, and can therefore serve to control the power factor. The indicator consists of a product element (1), a monostable flip-flop (2), a pulse width comparator (5), a memory element (4) and a signal element (5), which are connected according to Fig. 1. The desired phase shift, the exceeding of which is to be signaled, is set by the parameter! of the monostable flip-flop (2). If the phase shift of the signals at the input of the product element (1) is greater than this set phase shift, the signal element reports this condition. The signal; from several points can be concentrated at a central station, or in a computer.

Description

248 S91

The present invention provides an indication of phase overrun periodic electrical waveforms, such as current flow and voltage across the power grid, and allows to track, record, and evaluate the power factor in selected slot locations, as well as centralize data from these points to a central location.

A known device for indicating the phase shifting of two periodic processes has been established, based on the use of a cosmeter with constant in transducers adjustable to the selected cos value, and the selected phase voltage and power shift in the network. Other devices utilize the principle of measurement and observation of active and reactive power by means of wattmeters and evaluate their power factor from their ratio. The disadvantage of these devices is wear of contacts, complexity, low reliability and low sensitivity, since the cos function curve around its unit value is very flat and in practice it is used to control the power factor just this area. value0.95. in

The above-mentioned drawbacks are eliminated by the phase shifting indicator of the two periodic processes according to the invention, the principle of which is that two periodic intervals adapted to rectangular shapes are applied to a product member whose output is connected to the inlet of the steady-state flip-flop and, secondly, to the pulse width comparator input, to the second input of which the output of the monostable flip-flop is connected.

The pulse width comparator has two outputs that are connected to two inputs of a memory member whose output is connected to the input of the signaling member. - 2 - 248 S91

By incorporating a phase shifting indicator of two of the periodic processes according to the invention, a tactless, fast and responsive operation is achieved that allows for a continuous observation, for example, of whether the power factor is higher or lower than desired at a particular location. If the value of the power factor decreases to a certain value, that is, if the specified phase shift of the voltage and passage is exceeded, the signaling member will notify the operator of this fact, and the control and sensor may be, for example, a computer.

In the accompanying drawing, a block diagram of the phase shifting indicator of the two periodic runs according to the invention is shown.

Two periodic waveforms 01 and 02 adjusted to rectangular shapes are applied to two inputs of the product member 1, whose output 11 is connected to the first input of the pulse width comparator 2 and simultaneously to the input of the monostable flip-flop 2 whose output 21 is connected to the second pulse width comparator 2 output. The outputs 31 and 32 of the pulse width comparator 2 are connected to two inputs of a parity member whose output 41 is connected to the input of the signaling member 2 ·

The function of the phase shifting indicator of the yard in the periodic processes according to the invention is based on the fact that the overruns whose phase shifting is to be monitored are brought into a rectangular shape to the two-way 01- and 02 of the product 1, at the output of which a signal equal to their logical This signal is applied to the input of the pulse width comparator 2 and at the same time opens the monostable flip-flop 2 in which a signal is generated, which we select according to the requirement of the phase shift of the monitored periodic waveforms so that we can set the circuit parameters. The signal from the output 21 is fed to the second input of the pulse width comparator 2 in which its width is compared to the pulse width of the output of the coefficient 1 · If the pulse width is less than the width of the comparative pulse from the output 21 «phase shift input If the output pulse width is greater than the comparative pulse width, the phase shift will not appear at the output of the comparator2, and a signal will be output to the first input of the memory element 7, which will flip to the state that the output signal is zero. thus, a signal is applied to the output of the comparator 2, which is fed to the second input of the memory member 4 and flipped to such a condition that a signal is supplied at its output which is fed to the signaling member 2.

The phase shifting indicator of the two periodic waveforms can be used to monitor the intersection of two arbitrary electrical waveforms, in or of other physical waveforms, which can be transmitted through electrical waveforms.

Claims (1)

OBJECT OF THE INVENTION 248 391 Phase Shift Indication Indicator of two Periodic Trends, characterized in that the output (11) of the product member (1) with inputs / Q11 and / 02 / is connected to the first width comparator (3) pulses and simultaneously to the input of the monostable flip-flop (2) whose output (21) is connected to the second input of the pulse width comparator (3) whose outputs (31) and (32) are connected to two inputs of the memory member (4) the downstream memory member (4) is connected to the input of the signaling member (5) · 1 of the drawing