RU1827645C - Apparatus for testing relay parameters - Google Patents

Abstract

Usage: in instrumentation for automatic control of relay parameters. SUMMARY OF THE INVENTION: the aim is achieved by introducing a register 6, a binary counter 7, a first 8 and a second 9 read-only memory, a pulse shaper 10, a first 11 and a second 12 trigger, an EXCLUSIVE OR 13 element, a code-to-analog converter 14, a reference voltage source 15 voltage generator 16 rectangular pulses, the first 17 and second 18 sources of stabilized currents, the first 19 and second 20 switches, the display unit 21, the voltage source 26, the voltage divider 27 and the connecting pads 28 with five contact and elements. 2 ill., 3 tablets

Description

The invention relates to a measurement technique and can be used to automatically monitor relay parameters.

The aim of the invention is to expand the functionality, scope of use of the device and improve the accuracy of measurement of parameters.

In FIG. a functional diagram of the proposed device for monitoring relay parameters; in FIG. 2 are timing diagrams illustrating the operation of the device.

In the table. 1 shows a program recorded in a read-only memory control device; e tab. 2 is a program recorded in a read-only memory for three versions, for example, a relay type, RES 49, in the table. 3 - particular parameters, the position of the switches for selecting the design and the selection of the operating voltage for three versions of the type of relay RES 49.

The device contains the tested relay 1, switch 2, sensitive amplifier 3, comparison circuit 4, element 5 OR, register 6, binary counter 7, first 8 and second 9 read-only memory (ROM), pulse shaper (FI) 10, first 11 and the second 12 triggers, an EXCLUSIVE OR element 13, an analog code converter 14, a reference voltage source 15, a rectangular pulse generator 16, the first 17 and second 18 sources of stabilized currents, the first 19 and second 20 switches, the display unit 21 from the first to fourth 22-25 LEDs, source 2 6 voltage, voltage divider 27 and connecting block 28 from the first to fifth 29-33 contacting elements.

(L

WITH

The first, second and third conclusions of the tested relay through the corresponding contacting elements 29-31 are connected respectively to the first, second and third information inputs of the switch 2. The first and second outputs of the winding of the tested relay 1 through 32 and 33 contacting elements are connected respectively to the fourth and fifth information the inputs of switch 2. The sixth and seventh information inputs of switch 2 are connected respectively with the outputs 17 and 18 of the stabilized current sources, and the eighth information input with output lyuchatel 19 select the operating voltage of the test switch 1. 1-n of the switch inputs 19 connected respectively to the n-1 input voltage divider 27 where n is the number of working stress test performances relay 1 (see the above example). The input of the voltage divider 27 is connected to the output of the voltage source 26. The control input of the switch is connected to the second output of the pulse former 10, the third output of which is connected to the parallel recording input of the analog code converter 14, and the first output is connected to the parallel recording input of register 6. From the first to the third outputs of the register 6 are connected respectively to 22-24 LEDs of the display unit 21, and from the first to fourth information inputs - from the first to fourth outputs of the ROM 8. From the first to fourth address inputs of the PP At control 8, respectively, the first to fourth outputs of the binary counter 7 are connected, the clock input of which is connected to the clock input of FI 10 and connected to the output of the square-wave generator 16. The Input Set About binary counter 7 is connected to the Reset input of FI 10, switch 2 and is connected to the direct output of trigger 12. The R input of trigger 12 is connected to the R input of trigger 11 and connected to the Start bus, a S input of trigger 12 is connected to the output of the element 5 OR, the first input of which is connected to the third output of the register 6, and the second input with the fourth LED 25 of the display unit 21 and with the direct output of the trigger 11. The sync input of the trigger 11 is connected to the fourth output of the FI 10, a D input with the output of the element 13 EXCLUSIVE OR whose first input is connected to the fourth ora 6, and the second input - with the output of the circuit 4 comparisons. The first input of the comparison circuit 4 is connected to the output of the sensitive amplifier 3, and the second input of the comparison circuit 4 is connected to the output of the code-analog converter 4. The input of the sensitive amplifier 3 is connected to the output of the switch 2. The input Eon of the code-analog converter 14 is connected to the output of the reference voltage source 15. With the 1-bit inputs of the code-analog converter 14, where m is the number of bits of the code-analog converter 14 are connected respectively to the 1 outputs of option 9 ROM, the first and second address

whose inputs are connected respectively

with the first and second outputs of control ROM 8, and with Ill-i the address inputs are connected respectively to the 1-q outputs of the code switch 20, where I is the number of address

5 inputs of ROM version 9 is determined, and q is the number of bits of the code switch 20, and is determined as follows: q is equal to the number of bits allowing to obtain T h binary code combinations, where T is the number

0 temperature values at which the test is carried out, a h the number of tested versions of relay 1 (see the given example).

The device operates as follows.

Before starting operation of the device, the switches Selection of execution 20 and Selection of operating voltage 19 are set in the position corresponding to the passport and

0 to the operating voltage of the tested relay 1. On the connecting block 28, the tested relay 1 is inserted, as a result of which the first, second and third switching 3 contacts of the tested relay 1 through 29, 30 and 31

5, the contacting elements of the block 28 are connected respectively to the first, second, and third inputs of the switch 2, and the terminals of the winding through 32 and 33, the contacting elements are connected, respectively

0 with the fourth and fifth inputs of switch 2; after which a Start signal is issued, which, upon entering the inputs R of the triggers 11 and 12, sets them to the zero state, from the output of the trigger 12 is logical zero

5, the signal goes to the inputs of the Reset switch 2, FI 10, address counter 7 and starts the algorithm of the device.

The device operation algorithm consists of two measurement and rejection programs:

0 winding resistance measurement and rejection program (Ro6.);

contact resistance measurement and rejection program (Rk.). Measurement and rejection R06. starts5 with the arrival of the first clock after the start signal. From the leading edge of this pulse, the counter 7 starts to count and the information corresponding to the first address is set at the outputs of the ROMs of the controls 8. From the trailing edge

the first clock pulse at the first output of FI 10, a single signal is generated, which, entering the input of the parallel write of register 6, writes information from the ROM 8 of it, as a result of which the logical unit appears at the first output of register 6 and the Ro6 LED lights up . 22 in the indication block 21 corresponding to the measurement of the resistance of the winding of the tested relay 1. Next, only those edges of the clock pulses that will act on the operation of the device will be marked, and those that will not act will not be marked.

With the arrival of the trailing edge of the second clock pulse at the second output of FI 10, a single signal is generated, which, upon entering the control input of switch 2, leads to the next switching of switch 2. The fourth and sixth inputs of switch 2 are connected to its output, and the fifth input to earth bus. This leads to the fact that the first terminal of the winding of the tested relay 1, through the contacting element 32 of the connecting block 28, is connected to the output of the current source 17 and to the input of the sensitive amplifier 3, and the second terminal is connected through the contacting element 33 to the ground bus. As a result, a current begins to flow through the winding of the test relay 1, which creates a voltage drop Uo6. to the winding of the tested relay 1, the value of which is amplified by a sensitive amplifier 3 and fed to the second input of the comparison circuit 4, With the arrival of the trailing edge of the third clock pulse, a single signal is generated at the third output of FI 10, which, when the analogue code 14 goes to the input of the parallel recording of the converter, records in it the information received at its inputs from the outputs of ROM version 9. This information corresponds to the upper limit value of the winding resistances of the tested relay 1 at a temperature at which with measurement.

The analog code converter 14 converts this information, which is m bit binary code, where m is the number of inputs of the analog code converter 14 to the reference voltage Uon.aepx., Where Uon.uepx. this is the voltage value corresponding to the upper limit value of the resistance of the winding of the tested relay 1 at the temperature at which the measurement is made and feeds to the first input of the comparison circuit 4. At the value Uon.eepx.KURo6., where URp6. is the voltage value created on the winding of the relay under test 1, when the source current 17 flows through it, and K is the gain of the sensitive amplifier 3, the output of the comparison circuit 4 shows zero logic potential, which is applied to the second input of element 13 EXCLUSIVE OR . Zero potential is applied to the first input of element 13 EXCLUSIVELY OR from the fourth output of the state register, as a result of which the output of element 13 is set to a logical zero potential, which, entering the trigger input D 11, is written to it using the pulse that occurs on

5, the fourth output of FI 10, therefore, at the sync input of trigger 11 with the arrival of the trailing edge of the fourth clock pulse. As a result, the state of the trigger 11 does not change, which indicates the validity

0 measured value of the winding parameter. With the value Uon.Bepx KURoB. at the output of the comparison circuit 4, a single logical potential appears, as a result of which the trigger 11 is transferred to a single state 5. The unit potential from the output of the trigger 11 through the OR element 5 is fed to the input S of the trigger 12, which transfers it to a single state, which creates a signal at its output

0 A reset, which, upon entering the corresponding inputs of the address counter 7, FI 10, of the switch 2, resets them to the zero state and this stops the process of measuring and rejecting the relay parameters.

5 From the output of the trigger 11, the signal also goes to the Brak 25 LED of the display unit 21 and lights it, which indicates the unsuitability of the measured value of the winding parameter.

0If the resistance of the winding of the tested relay 1 during the test with the upper limit value of the resistance turned out to be normal, then from the fifth step the test of the resistance of the winding of the tested

5 relays 1 with a lower resistance limit value. With the arrival of the leading edge of the fifth clock pulse, the counter continues to count and changes the address at the first and second address inputs of ROM version 9, as a result of ROM version 9 it outputs information corresponding to the lower limit value of the resistance of the winding of the relay under test 1 at temperature, at

5 which is being measured. With the arrival of the trailing edge of the fifth clock pulse at the third output of FI 10, a single signal is generated, which, upon entering the parallel recording input of the code-analog converter 14, is written

it the information received at its inputs from the outputs of ROM performance 9. The converter code-analog 14 converts this information into a reference voltage Don.nih where Uop.nizh. - this is the voltage value corresponding to the lower limit value of the resistance of the winding of the tested relay 1 at a temperature at which the measurement is made and feeds to the first input of the comparison circuit 4. With the arrival of the trailing edge of the sixth clock pulse, a single signal is generated at the first output of FI 10 the parallel recording of the recorder 6, writes information in it corresponding to the sixth clock received at its inputs from the outputs of the ROMs of controls 8, as a result of which at the first and fourth outputs of the register state -6 appears as a logical unit, while the illumination of the Ro6 LED continues. 22 and at the first input of the EXCLUSIVE OR 13 element, a unit potential appears, which leads to inverting the output state of the comparison circuit 4. When KiKob Iop. Is lower. at the output of the comparison circuit 4, the unit potential is established, and on D the input of trigger 11, based on the foregoing, the zero potential, which is recorded in it with the help of a pulse, which occurs at the fourth output of FI 10 and therefore to the sync input of trigger 11 with the arrival of the trailing edge of the seventh clock pulse . As a result, the state of the trigger 11 does not change, which indicates the validity of the measured parameter of the winding. With a value of K 1Shob.1) op.nizh. at the output of the trigger 12, a Reset signal is generated similar to the formation of a Reset signal when measuring the upper limit value of the winding resistance.

Thus, if the value is UR06. is in the range of п.0 .. lower .. and п..sup.up., the start of the eighth clock pulse starts the program for measuring and rejecting the contact resistance of the contacts of the tested relay 1. With the arrival of the leading edge of the eighth clock pulse, the counter 7 continues to count and the information is set at the outputs of the ROM 8 corresponding to the eighth address. From the trailing edge of this pulse, a single signal is generated at the first output of FI 10, which, entering the input of the parallel write of register 6, records information from the ROM 8 of it, as a result of which a logical unit appears at the second output of state register 6 and the LED 23 in the display unit 21 corresponding to the parameter of measuring the contact resistance (Kk) of the tested relay 1 lights up. With the arrival of the trailing edge of the ninth clock pulse, a single signal is generated at the second output of FI 10, which pa to the control input of switch 2, leads to the following switching: the second and seventh inputs

0 of switch 2 is connected to its output, and the first input is connected to the ground bus. This leads to the fact that the middle contact (SR) of the tested relay 1 through the contact element 30 of the connecting block 28 is connected to the output of the current source 18 and to the input of the sensitive amplifier 3, and the normally closed (NC) contact through the contacting element 29 is connected to ground Noah tire. As a result, through NC contact

0 of the tested relay 1, the current of the source 18 begins to flow, which creates a voltage drop at the NC contact Shk.nz. test relay 1, the value of which is amplified by a sensitive amplifier 3

5 and is fed to the second input of the comparison circuit 4. With the arrival of the trailing edge of the tenth clock pulse at the third output of FI 10, a single signal is generated, which, entering the parallel recording input of the analog code converter 14, write down the information received at its inputs from ROM 9 outputs. This information corresponds to the limit value of the transition resistance

5 contacts of the tested relay 1, which appears on the outputs of ROM version 9 with the arrival of the tenth clock pulse. The analog code converter 14 converts this information to the reference voltage Uon.RK. where Uon.Ric. is the voltage value corresponding to the limiting value of the transition resistance of the contacts of the tested relay 1. With the arrival of the eleventh clock pulse, at

5 values of Uon.RK.KURK.H3 and .K11 Nk. similar processes take place in the device, as during the arrival of the fourth clock pulse, respectively, at the values of uop. and Uon.Ro6.

0 Cshob.up. If the value of the NC resistance of the contact of the tested relay 1 is normal, i.e. U0n.RK.KRK. Note, then with the arrival of the twelfth clock pulse, the measurement of the transient resistance of normally open (HP) contacts begins. With the arrival of the trailing edge of this pulse at the second output of FI 10, a single signal is formed, which, upon entering the control input of switch 2, leads to the following switching:

the second and seventh inputs of switch 2 are connected to its output, the third and fifth inputs are connected to the ground bus, and the fourth input is connected to the eighth input. This leads to the fact that the middle contact of the tested relay 1, through the contact element 30 of the connecting block 28 is connected to the output of the current source 18 and to the input of the sensitive amplifier 3, and the HP contact through the contact element 31 to the ground bus, in addition with the ground bus through the contacting element 33 is connected and the second terminal of the winding of the tested relay 1, the first terminal of the winding of which through the contacting element 32 is connected to the output of the switch Select the operating voltage 19, the output of which there is a working voltage test relay 1. This triggers test relay 1, as a result of which the current of the test relay 1 starts to flow from the source 18 through HP, creating a voltage drop on it, i.e., the voltage of its voltage is amplified by the sensitive amplifier 3, and is applied to the second input of the comparison circuit 4. In the thirteenth step, the continuation of the measurement of the contact resistance HP occurs similarly to the measurement of the resistance of the NC contact.

Thus, if the value of the contact resistance HP was also normal, i.e. Uon.RK.KURK.HP, then with the arrival of the trailing edge of the fourteenth clock pulse, a single signal is formed at the first output of FI 10, which, entering the input of the parallel recording of register 6, writes information corresponding to this clock to its inputs from The control ROM 8, as a result of which the logical unit is not the third output of the state register 6, the Goden LED 24 of the display unit 21 lights up which indicates the validity of the tested parameters of the tested relay 1. The logical unit is from the third output Yes, register 6 through the OR gate 5 is also fed to trigger input 12 of S, as a result of which a reset signal is generated at the direct output of trigger 12, which, when received at the corresponding inputs of switch 2, counter 7, and FI 10, resets them to the zero state and The device operation algorithm ends.

To best represent the operation of the device in FIG. Figure 4 shows the ROM program with an eight-bit code-analog converter with a reference value of 072V, gain K 10 of amplifier 3, and

current, 1 mA of the current source 17 and 6 mA of the current source 18, and in Fig. 5 particular parameters, the position of the code switch 20 and the switch 19 for three versions of the type of relay RES49.

As already noted, the number of bits of the code-analog converter 14 for the above example is eight, i.e. From the table. 3 it can be seen that the number of temperature values at which the test is carried out is four, i.e., and the number of checked versions, therefore, the number of bits of the code switch 20 will be equal to the number of bits allowing to obtain T binary code combinations, i.e. From the table. Figure 3 also shows that all the tested three relay designs have different operating voltages, which means that the number of positions of the switch 19 must be three and in each position at its output it must provide one of the operating voltage of the tested relay designs i.e. for the case presented.

Consider, for example, how a device can verify PC performance parameters. 569.421-08 type relay RES 49 at an ambient temperature of 23 ° C. Figure 5 shows that in order to check the parameters of this design at 23 ° C, it is necessary to put the switch 19 in position 3, and the code switch 20 in position 9. After that, it is necessary to put the tested relay on the connection block and press the Start button. Further, the verification process proceeds similarly to the verification process that was described when explaining the operation of the device. As noted above, for the case under consideration, an eight-bit code-analog converter with a reference value of 072V is used, this will enable us to measure the resistance of the winding of the tested relay design with a maximum error of + 2%, and the contact resistance of ± 0.5%.

The error in measuring the resistance of the winding can be considered as follows

Irk

- RoG.

RuG.

 100%,

and the contact resistance as follows

Eon. I AM

I2-K

Rk

100%

where m is the number of bits of the code-analog converter 14;

Eop is the reference voltage of the code-analog converter 14;

li is the current value of the current source 17;

K is the gain of the sensitive amplifier 3;

2 - the value of the current source 18;

Ro6. - winding resistance of the tested relay;

RK. - contact resistance of the tested relay;

I am the decimal value of the ROM code of the execution corresponding to the given parameter of the tested relay at the temperature at which the measurement is performed.

I am defined as follows:

I am At-1 -2m 1 + Am-2

+ A, 2lt - .. + Ai21 + A02 °

.

where i corresponds to the bit number of the code-analog converter 14, and the coefficient AI, this is binary information received on the i bit of the code-analog converter 14 from the corresponding ROM bit of version 9.

We consider, for example, the measurement error when measuring the lower limit value of the resistance of the winding version PC 4.569.421.-08 of the type of relay RES 49 at an ambient temperature of 23 ° C. As already noted at the top,,, 1 tA,, a, 072B, Figure 5 shows that the lower limit value of the winding for this design at a temperature of 23 ° C is Kob. 232.8 Ohms, and the corresponding binary ROM code of execution 00010011 (see figure 4). The decimal value of this code will be;

I 0-27 + 0-26 + 0-25 + 1 -24 + 0 -23 + 0-22 +

+ 1 21 + 1.

Thus, the measurement error will be:

nineteen

  10

-232.8

232.8

100% -2%.

For a more accurate measurement, it is necessary to increase the number of bits of the code-converter 14.

In the same way, it is possible to determine the measurement error when measuring contact resistances.

5

0

5

0

5

0 5 0

5

0

5

Thus, the proposed device for monitoring relay parameters, thanks to additionally introduced elements and new connections between elements, allows to increase the accuracy of measuring the parameters of the tested relay and to provide control of the resistance of the winding of the tested relay at different ambient temperatures, which indicates its wide functional capabilities and applications.

Claims (1)

SUMMARY OF THE INVENTION A device for monitoring relay parameters, comprising a switch, a sensitive amplifier, a comparison circuit, an OR element, characterized in that, in order to expand the functionality and scope of the device and improve the parameters, a recorder, a binary counter, a first and a second constant are introduced into it data storage devices, pulse shaper, first and second triggers, EXCLUSIVE OR element, code-to-analog converter, reference voltage source, rectangular pulse generator, the first and second sources of stabilized currents, the first and second switches, the display unit, the voltage source, the voltage divider and the connecting block with five contacting elements, the first, second and third terminals of the tested relay through the corresponding contacting elements are connected respectively to the first, second and the third information inputs of the switch, and the first and second conclusions of the winding of the tested relay through the fourth and fifth contacting elements with the corresponding information inputs to a mutator, the sixth and seventh information inputs of which are connected respectively to the outputs of the first and second stabilized current sources, and the eighth information input is connected to the output of the first switch, the first through n-th inputs of which are connected respectively to the first through n-th outputs of the voltage divider, the input of which is connected to the output of the voltage source, the control input of the switch is connected to the second output of the pulse shaper, the third output of which is connected to the parallel recording input of the code-analog converter, and rvy output - with output register parallel recording, with the first to third outputs of which are connected respectively to the first to third LED display unit and the first through fourth data inputs - with the first to fourth outputs of the first read-only memory, from the first to fourth address inputs of which are connected respectively to the outputs of the binary counter of the same name, the clock input of which is connected to the clock input of the pulse shaper and connected to the output of the square-wave generator, and input 0 is connected to the inputs The reset of the pulse shaper and the switch is connected to the direct output of the second trigger, the R-input of which is connected to the R-input of the first trigger and connected to the Start bus, and S-input is to the output OR gate having a first input connected to the third output register and the input of the second to the fourth LED indicating unit and connected to a direct output of the first flip-flop, whose clock terminal is connected to the fourth output of the pulse shaper, a D- the input is to the output of the EXCLUSIVE OR element, the first input of which is connected to the fourth output of the register, and the second input to the output of the comparison circuit, the first input of which is connected to the output of the sensitive amplifier, the input of which is connected to the output of the switch, and the second input to the output of the converter code -analogue, from the first to the mth bit inputs of which are connected respectively with the first to the mth outputs of the second read-only memory device, and the input EOP is connected to the output of the reference voltage source, the first and second address inputs of the second post of a real storage device are connected respectively to the first and second outputs of the first read-only memory device, and from the third to the first inputs, respectively, from the first to the g-th outputs of the second switch. (- any value, 0 or 1). Table 1 / ablitsa. 2 PC.563.421-06 + 13G2 0.5 PCit.569.21-08 +12 0.5 2 (-flS) 8CO ± 16C A 3 (+12) 27otj j 8