SU661443A1 - Relay time parameter measuring arrangement - Google Patents

Description

This invention relates to an electrical measurement technique. A device for measuring the parameters of relay devices is known, which contains a switching unit, to the inputs of which a measured product is connected, a comparison unit, a control unit, a decoder1, to the output of which alarm devices 1 are connected. However, such a device is complicated. The closest to the technical essence of this invention is a device containing an oscillographic indicator connected to the integrator output, one input of which is connected two resistors to the winding of the tested relay, controlling the relay, the winding of which is connected through a diode with one key contact, through one of its contacts with the second contact of the key to which the reference voltage is connected, a variable resistor connected to the second contact of the key, and the winding of the tested relay through. sequentially turn on nye second diode and a second supervisory relay contact connected to the first switch contact | 2. However, this device has insufficient accuracy. The aim of the invention is to increase the accuracy. The goal is achieved by the fact that the device containing an oscillographic indicator, the inputs of which are connected to the outputs of the integrator, one input of which is connected through serially connected first and second resistors to the winding of the tested relay, which controls the relay, binds the second winding through the first diode to one key contact and through one of its contacts with the second contact of the key connected to the bus of the Reference voltage, a variable resistor, the output of which is connected to the second contact of the key, the coil and the test relay through a serially connected second diode and a second contact of a controlling relay are connected to the first KoliTaKTOM key, an additional diode, a resistor and a relay are inserted, the winding of which is connected in parallel to the winding of the test relay, the second integrator input is connected via a series-connected additional resistor, the first contact of the additional relay, contact

the tested relay and the second contact of an additional relay with a variable resistor

si: H the point of connection of the first and second resistors, the first output of the integrator through a series-connected auxiliary diode and the third contract of the auxiliary relay connected to the first input

Integrator.

FIG. 1 shows the electrical of the proposed device; in fig. 2 - time diagrams of his work ..

The device contains an oscillographic indicator 1, an integrator 2 that controls relay 3 with contacts 4, 5, an additional relay 6 with contracts 7-9, diodes 10-12, resistors 13-15, variable resistor 16, switch 17. The drawing also shows the relay under test 18c contact 19.

Consider the operation of devices and when detecting fleSfemirBpeivreHHbTXnapaMeTpOB relays upon receipt, on its winding periodic sinusbidal signal.

When the key 17 is turned on, the circuit of the sources of the test signal and the constant voltage source are closed. In the positive half-period of the periodic signal, the controlling relay 3 triggers and blocks itself. At the same time (B time ti), the controlling relay closes the supply circuit of the periodic signal on test relay 18 and integrator 2. At the beginning of the negative half-period of the periodic signal (moment tz), the signal is sent to the tested relay 18 and the first input of the integrator 2, which begins to integrate the subject, in the result of which B03 {a vertical deviation beeps on the screen of the oscillographic indicator 1. At the moment of time t deputy Contact 19 of test relay 18 is bored, by shunting the first input of integrator 2, as a result of which the voltage on the integrator is proportional to the response time of the test relay 18, further integration is stopped. Resistor 13 eliminates the shortest sweep of the source of the test, on the yarn.

An additional relay 6, the time parameters of which should be approximately equal to the parameters of the relay 18 under test, has an additional structural element (for example, a short-circuited turn) providing a delay in its actuation and lowering so that it operates at time t4.

Having triggered, the additional relay 6 discharges the integrator, closes through diode 12 its pin 9 in the feedback circuit of Tegrater and P071 switches to the second input of the integrator 2 variable resistor 16, the voltage on which is set in advance equal to the release voltage of the tested relay 18. When decreasing values of the periodic signal to the value.

equal to the reference voltage (time ts), the integrator begins to integrate a positive signal equal to the difference between the reference and the subject, while diode 12

no shunt effect. At time tg, the contact of the tested relay 18 opens, removing the reference voltage from the second input of the integrator 2, as a result of which the voltage on the integrator remains constant and proportional to the amount of time

releasing the test person, relay 18. At the moment of time, the additional relay 6 is released.

Know the parameters of the reference and test voltage, the transmission coefficient of the integrator 2 and the sensitivity of the indicator 1. It is relatively easy to determine the time parameters of the tested relay 18.

The use of the proposed device for determining the time parameters of the relay improves the accuracy in determining the response and release times. Invention Formula

A device for measuring the time parameters of a relay, containing an oscillographic indicator, whose inputs are connected to the integrator's outputs, one input of which is connected through the first and second resistors connected in series to the winding of the test relay, controlling the relay, the winding of which is connected through the first diode to one key contact and through

ONE of its contacts is the second contact of the key connected to the reference voltage bus, a variable resistor, the output of which is connected to the second contact of the key, and the coil of the test relay through a series-connected second diode and the second contact of the controlling relay is connected to the first contact of the switch. that, in order to increase the accuracy, an additional diode, a resistor and a relay, the winding of which is connected in parallel to the winding of the tested relay, are introduced into it, the second integrator input is connected via

5 in series an additional resistor, the first contact of the additional relay, the contact of the test relay and the second contact of the additional relay with a variable resistor and the connection point of the first and second resistors, the first

° the output of the integrator through a series-connected auxiliary diode and the third contact of the additional relay is connected to the first input of the integrator.

Sources of information taken into consideration at examination

1. USSR author's certificate number 434531, cl. H 02 H 1/00, 1972.

2. USSR author's certificate number 424090, cl. G 01 R 31/28, 1972.

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