SU1460753A2 - Phase comparing device - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to relay protection. The purpose of the invention is to obtain the desired range of angles of operation between the compared values. It is achieved by the fact that the shaper 2 and the additionally introduced shaper 1 of rectangular rm pulses are phase-controlled and, in addition to the logic block, the same block on the elements 4.5 is introduced from two major elements 6.7. Moreover, the outputs of all drivers and majority elements are associated with individual inputs of adder 8 (output of generator 3 is connected to two inputs of adder), the first inputs of elements 4-7 are connected to the output of generator 3, and the second inputs of elements 4.5 and 6.7 connected to the outputs of the formers 1 and 2. 2 Il. S O)

Description

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The invention relates to electrical engineering, can be used when making devices for relay protection and automation of power systems, and is an improvement to the device according to author. N 11А1499.

The purpose of the invention is to obtain the desired response characteristics of a power relay or resistance in the form of the intersection of two characteristics, each of which can be a straight or a circle, which expands the functionality of the relay.

Figure 1 shows the functional diagram of the device; Fig. 2 shows timing diagrams for the operation of the device in various modes.

The device contains shapers of 1-3 rectangular pulses, the first two of which are phase controlled. The outputs of the formers are connected to the inputs of the major element 4-7 with feedback, the inputs of the sum-. Matora 8, the output of which is connected to the input of the imaging unit 9 module. The outputs of the formers 1 and 2 form a sequence of rectangular pulses coinciding in sign with the input voltage .E, shifted in phase by angle- + cf, and - + cf, respectively, and the angles of C, and (f depending on the circuit parameters be adjusted from about 1 to 1 g.

At the output of the forming unit of 3 rectangular pulses, the polarity of the input voltage E, is opposite to.

The majority elements 4 and 6 change their state when the characters of the input values coincide, and the elements 5 and 7 change if these characters do not match. This is due to the fact that in the first case, the resistors, to which the input values are applied, are connected to one input of the amplifier, and in the second case to its different inputs.

The majority elements 4-7 implement the majority logic functions, respectively, of the m - m three arguments:

Ms x, x2 + x ,. Xs + x, .Xjj

(one)

 M, X, X ,, + X, - Xs +

+,.

(2)

where X ,, Xj, X, are input signals, the signal x being equal to the corresponding output signal due to feedback, and the inversion signs indicate the inverse output and inputs in x and X ,.

The transfer coefficients of the adder 8 for the four first inputs are twice as large as for the rest.

The operation of the circuit will be considered in four modes (a-d, in Fig. 2), corresponding to different ranges in which the angle between the input values E, and E, is. These ranges are determined by the following inequalities:

cf, -TT-Hz iq j + a ir; (3)

 cf, -;

if, h-TG,

where q and Cfj are the phase shift angles introduced by shaper 1 and 2 without taking inversion into account.

The output voltages of the units 1–9 of the device (FIG. 1) are denoted respectively by Q and. in figure 2.

Each mode has its own level of output voltage of the device, which is a module of the output voltage of the adder. The sum E is not equal to zero when

 q. + ir

(7)

and is zero when

q, Cf +21

(eight)

The sum E 25 may also not be equal to or equal to zero under conditions different from (7) and (8) only by replacing q with cf.

Consequently, in the first mode, the voltage U is zero (E Ej. 0), in the second mode it is equal to Ejg- (Е, 0), in the third mode Ug is equal to E, j .., and in the fourth mode it is equal to Е 2s Difference voltage levels U, in the second and fourth modes, due to the inequality of the transmission coefficients for the first four inputs of the adder 8 and the rest.

Thus, the proposed device records any desired range of angles set by the formers 1 and 2 (Fig. 1). Its use in a power or resistance relay provides characteristics in the form of the intersection of two straight, two circles, or straight with a circle, which expands the functionality of these relays.

Claims (1)

Invention Formula A device for comparing the phases of the author, No. 1141499, characterized in that, in order to obtain 1 1460753 Neither of the desired range of trigger angles, one of the rectangular impulse drivers was phase-adjustable and one more phase-adjustable rectal impulse driver and another logical block of two major feedback elements were added, the outputs and the pairwise combined first and second inputs of which are connected respectively to the four additional inputs of the adder and, in addition, the aforementioned first inputs of the major elements are connected to the output of the entered phase-controlled square pulse former having a common input with the other same driver, and the second inputs connected to the output of the third rectangular pulse former.