SU406187A1 - DEVICE FOR MONITORING THE SENSITIVITY OF THE RELAY - Google Patents

Description

one

The invention relates to the field of automation and testing equipment.

A device is known for monitoring the sensitivity of a relay, which contains an impulse generator, a digital voltmeter and a frequency divider whose output is through the first OR circuit to the unit: control input, the output of the second OR circuit is connected to the zero input. The output of the control trigger is connected to the first input of the AND circuit connected to the three-digit decimal counter, the outputs of which are connected to the first inputs (code converter, the second gate of which is connected via a switch to the power source.

However, this device “e can control the sensitivity of the relay automatically and therefore has low accuracy and speed.

The proposed device is characterized in that a counter for three impulses and three relays, the windings of which are connected to (inputs of the counter for three impulses) are entered into it. One series-connected normally closed contacts of two relays are connected to the first and second decade of the three-digit ten-counter and the divider input frequencies, other consecutively connected normally closed contacts of these relays, shunted by resistors, to the output of a code-voltage converter "to the input of a monitored relay, the output of which through a switch is connected to the input of the counter for three pulses and the input of the second logic circuit "OR. The first normally closed contacts of the secondary relay are connected to the output of the impulse generator and the input of the logic circuit" I, and the second to the output of the voltage-voltage converter and the input of the digital voltmeter.

This improves the accuracy and speed of the device.

The circuit of the proposed device is shown in the drawing, where: the impulses / generator, controlled by relay 2, logic circuit "AND 3, first and second logic circuit" OR 4 to 5, frequency divider 6, three-digit decimal counter consisting of decade 7, 8, 9, code-voltage converter 10, switch 11, power source 12, counter 13, control trigger .14, resistors 15, il6, digital voltmeter 17, third relay 18, second relay 19, and first relay 20.

The impulse generator 1 is made according to the scheme of a conventional multivibrator operating at frequencies of 0.6–1 Hz, depending on the time constant of the monitored relay 2. Frequency divider 6 is a four-bit BINARY with negative feedback. The three-digit decimal counter consists of decades 7-9, performed on the base of a four-digit binary counter with feedback.

The load for decades 7–9 is the following code-for-example converter converter 10, the polarity of which is determined by the position of the switch // connected to the output of the two-pole power source 12.

The device works as follows.

Before the relay is controlled by the switch, a second logic circuit 5 and a counter 13 for three impulses are connected to the output of the monitored relay 2.

Counter 13 produces a signal at output I nr and recording one or more "pulses, at output II - when recording two" more pulses, at output III - when recording three or more pulses.

To stop the three-bit counter, the output of the second logic circuit 5 is connected to the zero input of control trigger 14. In order to reduce the fixed level of test voltage at the output of the transducer 10, resistors 15, 16 are used to complete the first and second cycles, respectively.

The first cycle of the installation of test overvoltage. The first control mode of the converter 10 only by the senior decade 9, in the second cycle the decade 8 is connected to the decade 9, in the third cycle they participate in the control of the converter 10 all three consecutive decades 7, 8, 9 .

A digital voltmeter 17 is used as an input signal meter.

By the command "reset the pulse frequency divider. To" 10 6, three-digit decimal counter from decades 7-9, counter 13, control trigger 14 are set to the position corresponding to the absence of test voltage at the input of the controlled relay 2.

-At the command "install.vka supplied via the first" OR 4 circuit to the single input trigger trigger 1p. 14 and 14, a potential 5p resolution is generated for the circuit "And 3. As a result, the output impulses through the normally closed relay contacts 18, the circuit “AND 3, normally closed contacts of the relay 19, 20 fill the high decade 9.

The output signal of the converter 10, which has a stepped form. An polarity, for example, positive, is applied through normally closed contacts of the relay 19, 20 to the input and output of the monitored relay.

At the same time, it led; the cause of the test voltage step (increment change step), depending on the expected sensitivity level of the monitored relay, can be adjusted within the required limits. The lower limit is limited by the level that causes the monitored relay to turn off after the first .set installation cycle .:

After processing the object of a co.control at one of its outputs, there is a pulse, which, through the second OR 5 circuit, triggers control trigger 14 to generate an impedance from the And 3 circuit. at the beginning of the decade 9 it stops, at the same time, the output of a single impulse of the object of control by the counter -13 is recorded. As a result, a relay 20 is triggered, which "unfolds the decade 3. And resistor 15.". Connecting to the control object sequentially (resistor 15 reduces. At its input the test voltage recorded by the discrete value of changing the output signal of the converter 10.

The second and third cycles of setting the test voltage at the input of the object are controlled by pushing the output pulses to divide the frequency of the pulses by "10 6" through the first OR 4 circuit to the single input of the control trigger 14. The logic of the second and third cycles is similar the logic of the machine during the first cycle.

The reduction of the fixed test voltage level at the input of the test object by the magnitude of the discreteness of the output signal of the converter 10 during the second cycle is performed using a resistor 16 connected in series with resistor 15 after "unwinding it with normally closed contacts relay 19, which also opens decade 7 to perform the third cycle.

After the third cycle at the input of the monitored relay, the setup voltage is set to a test voltage level equal to the sensitivity with an error not exceeding step 0 of the resolution of changing the output voltage of the converter 10. Using the contacts of the relay 18, the generator 1 is disconnected from the input An AND 3 circuit and a digital volt. meter 17 is connected to the input of a relay being relayed. five

Subject invention

Sensitivity control device

a relay containing a pulse generator, a digital voltmeter and a frequency divider, the output of which through the first logic circuit "OR is connected to a single control trigger input, to the zero input of which

 the output of the second logic circuit "OR" is connected, and the output of the control trigger is connected to the first input of the logic circuit "AND, connected to the output to the decimal counter whose inputs are connected to IK first

0 input.m converter code-voltage,. the second input of which is connected through a switch to a power supply source, which is different in that, with a slot for increasing the accuracy and speed of the device, in

counter. and tr. relays, the windings of which are connected to the counter outputs, one in series connected nor.malno closed contacts of two relays - to the first and second decade; three razres of a single decade counter and in-one frequency divider, and others connected in series normally closed contacts of these relays, shunted by resistors, to the output of the code-voltage converter AND to the input of the controlled relay, output

through which a switch is connected to the input of the counter l to the input of the second logic circuit, the first normally closed contacts of the third relay are connected to the output of the generator of the impulses, and the input of the logic circuit "And, and the second normally closed contacts of the third relay to the output of the code converter and the input of the digital voltmeter .

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