SU1332443A1 - Alternating current relay - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to relay protection. The purpose of the invention is to reduce the return time and improve the accuracy of adjustment of the relay settings. Amplitude amplitude detectors 2 and 3, connected to the output of current transducer 1, are equipped with zero setting circuits and additionally inserted setting pulses 4 by the driver; it generates pulses at the moment the input current passes through zero values having the sign of its derivative. The source of the two-pole reference voltage 7 is made adjustable and connected to the outputs with the discharge resistors 5 and 6, and the comparator, 1 hp. f-ly, 3 ill. (L

Description

 13324432

The invention relates to the electrical connection of the input diodes 12 to the technique, in particular, to the relay charging and 13 and the type of discharge transistors.

18 and 22. With a positive input signal (U, 0), the capacitor 15 is charged to a voltage U, reduced by the amount of voltage drop across

shield and automation of power systems.

The purpose of the invention is to reduce the return time and increase the accuracy of adjustment of the relay settings.

FIG. 1 shows a circuit diagram of the device; in fig. 2 is a circuit diagram with an inverter; in fig. 3 - device operation schedules in various modes.

AC relay contains

ten

diode 12 almost instantaneously, since the charge time constant, (, "R, C, 5 is very small. During the charging process, the voltage on the capacitor 15, which is the output voltage Uj of the detector 2, essentially repeats the input voltage U,. Amplitude input converter 1, amplitude - with detector 3 negative polarity detectors positive 2 and it works similarly with a negative 3 polarity formed by the input signal (U, 0) and its 4 adjusting pulses As the output appears, the output resistors are 5 and 6 , U source 7 U. Voltages Uj and Uj of capacitors 15 and 17 are fed to the first inverting and fourth direct inputs of the comparator 41, respectively.

The source of the two-pole reference voltage is the source of a stabilized two-pole reference voltage, the comparator 8.

Input converter 1 contains an active shunt 9, intermediate current transformer 10, output ak20

through coupled (with a common engine) adjustable resistors 39 and 40. The voltage at the source outputs is equal to

thirty

and,. iU ± ei -E

n 5

(one)

a potential divider 11 of the voltage, a distributed power supply of the op-amp, connected polar amplitude detectors 2 and 3 contain input diodes 12 and 13, respectively, active-capacitive circuits 14-17, zero-setting circuits - transistor 18, resistors -19-21 and a transistor 22, resistors 23-25. Shaper 4 installation pulses contains a sinusoidal voltage generator operating in self-oscillating mode, amplifier 26, capacitors 27 and 28 ,. resistors 29-32, summing null indicator - amplifier 33, resistors 34-36, differentiator-capacitor 37, resistor 38. The source 7 of the two-pole reference voltage is a source of stabilized power of the operational amplifiers, connected through regulating resistors 39 and 40 to four - input comparator 8, in the form of amplifier 41 and resistors 42-45. Inverter 46 is made in the form of an amplifier 47, diodes 48 and 49, resistors 50-52.

where oij is the division factor.

The second and third inputs of the comparator 8 receive voltages 1 from the outputs of the source 7 of the two-pole reference voltage. With equal resistances of the resistors 42-45, the voltages on the inverting U and non-inverting inputs are

40

and"

neither

o, 5 ();

0.5 (and, + and „„).

45

The comparator is triggered when

.

(2) (3)

(four)

Relay AC operates as follows.

Converter 1 performs linear conversion of the input current ig into output voltage and, which is fed to the working inputs of the amplitude detectors of positive 2 and negative 3 polarities. They have essentially the same schemes and differ only in pressure.

diode 12 almost instantaneously, since the charge time constant, (, "R, C, 5 is very small. During the charging process, the voltage on the capacitor 15, which is the output voltage Uj of the detector 2, essentially repeats the input voltage U,. Amplitude detector 3 of negative polarity operates similarly with a negative input signal (U, 0) and output voltage U appears at its output. Voltages Uj and Uj of capacitors 15 and 17 are fed to the first inverter and the fourth direct inputs of the comparator 41, respectively.

through coupled (with a common engine) adjustable resistors 39 and 40. The voltage at the source outputs is equal to

the power supply of the OU connected

thirty

and,. iU ± ei -E

n 5

25 sighted OS food,

25 sighted OS power supply, connected

where oij is the division factor.

The second and third inputs of the comparator 8 receive voltages 1 from the outputs of the source 7 of the two-pole reference voltage. With equal resistances of the resistors 42-45, the voltages on the inverting U and non-inverting inputs are

40

power supply unit

and"

neither

o, 5 ();

0.5 (and, + and „„).

The comparator is triggered when

.

(2) (3)

(four)

25 sighted OS power supply, connected

In view of (2) and (3), inequality 50 (4) takes the form

0.5 (and, - Uon) 0.5 (U, 4- Uon) (5)

or after transformations, the relay of the current of the current value is triggered when

Uz-,; 0.5 (U, - U5) Uj

(6) (7)

The shaper 4 of the setting pulses generates at the output short-time (1-2 ms) opposite-polarity pulses U4, which open the transistors 18 (positive pulses) and 22 (negative pulses) and, accelerating the discharge of capacitors 15 and 17, reduce the return time of the relay. The setting pulses are formed when the terminals of which are connected to one difference in the input voltage at moments close to the moments of its zero crossing, and in the absence of the input voltage (U, 0) at the points of zero crossing auxiliary voltage

Resistors 5 and 6 provide a time-sensitive, time-sensitive discharge.

15

The waters of the corresponding discharge resistors, the other outputs of which are connected to the outputs of the two-pole reference voltage source, the output of the amplitude detector of positive polarity are connected to an inverting comparator input, characterized in that, in order to reduce the return time and increase the control accuracy, relay, additionally introduced shaper set-up pulses, made in the form of series-connected sinusoidal generator on the yarn, summing zero-indicator and differential At the same time, one of the inputs of the summing zero indicator is connected to the output of the current converter, the output of the differentiator is connected to the installation inputs of different amplitude detectors, each of which is equipped with a zero setting circuit, the source of the two-pole reference voltage is adjustable, the outputs are positive and 35 negative polarities of which are connected respectively to the direct and inverting inputs of the comparator, to the direct input of which the output is also connected, the amplitude detector of the negative field p awns.

rf r

WITH,

CH-RS

The use of an adjustable voltage source 7, the same for the discharge resistors 5 and 6 and the comparator 8, improves the accuracy of setting control and reduces the error introduced by several sources of reference voltage.

When inverter 1 is connected to the inverter 46 on its output, its output signal and inverted relative to the input signal U, increases relative to the latter in the positive and negative half-wave by the value of iUa the voltage drop across the diodes 48 and 49. Further, this increase is compensated by a drop the voltage on diodes 12 and 13 of amplitude detectors 2 and 3 and the voltage U, U, the charge of their capacitors 15 and 17, almost without distortion, monitors the input voltage U ((taking into account the inversion), which increases the accuracy of operation e., without the inverter circuit (FIG. 1) and voltage and Uj during charging

less voltage U, modulo the value of UQ (Fig. 2). Fo rmula from obrem-shade

Claims (1)

1. An alternating current relay containing an input current transducer whose output is connected to the combined working inputs of two different-pole amplitude detectors, whose outputs are connected to one of the The waters of the corresponding discharge resistors, the other outputs of which are connected to the outputs of the two-pole reference voltage source, the output of the amplitude detector of positive polarity are connected to an inverting comparator input, characterized in that, in order to reduce the return time and improve the accuracy of adjustment of the relay settings, additionally, a driver of setting pulses is introduced, made in the form of serially connected generator of sinusoidal voltage, summing zero indicator and differential the torus, one of the inputs of the summing zero indicator is connected to the output of the current converter, the output of the differentiator is connected to the installation inputs of different amplitude detectors, each of which is equipped with a zero setting circuit, the source of the two-pole reference voltage is adjustable, the outputs are positive and the negative polarities of which are connected respectively to the direct and inverting inputs of the comparator, to the direct input of which the output is also connected, the amplitude detector of the negative polarity and. 2, Relay according to claim 1, about tl and h a go This is due to the fact that the output of the current converter through an inverter on an operational amplifier with opposite-side diodes in its feedback is connected to the input of the driver of setting pulses. &: efГ f -p L Stoi and Fig.Z VNIIPI Order 3843/51 Circulation 617 Subscription Random polygons pr-tie, Uzhgorod, st. Design, - A