SU1361650A1 - Device for checking safety units for serviceability - Google Patents

Abstract

This invention relates to electrical engineering and is intended to test relay protection. The purpose of the invention is to increase the convenience of operation. In case of failure of one or several protection blocks, the inputs of the first NAND element contain signals of both a logical zero and a logical one. Resetting the recorder triggers to zero does not occur, and the light bulbs fix the faulty blocks. After the fifth pulse of the generator with the arrival of a logical unit signal to the input of the third AND-NOT element from the inverted trigger output of the switch through the delay element, a logical zero signal appears at the input of the third AND-NOT element, which, through the second element, turns off the actuating element opening output contact in the supply circuit of the contactor coil until the fault is eliminated. 1 il. with $ (L; x 05 05 ate

Description

13

The invention relates to devices for checking the operability of protection, in particular, in the network supplying mobile working machines.

The purpose of the invention is to increase the convenience of operation.

The drawing shows a diagram of the device;

The device contains an earth leakage protection unit 1 with a superimposed current source connected between one of the phase conductors of the network and the ground, the first 2, second 3 and third 4 power supply units with current sensors in the network leads, neither with a separation transformer 6 and grounding wires 7, a recorder 8 made on RS-flip-flops 9-13 with two inputs, light bulbs 14-18 connected respectively to the inverse outputs of the flip-flops, first 19, second 20, third 21 NAND units, source 22 operational power on the generator 23 of 1Ugul tivibrator with a frequency of 1-2 Hz, the fourth 24 and the fifth 25 AND-NOT elements - the first 26 and second 27 elements of the delay NOT 28, the first 29 and second 30 And elements, the executive element 31 with the key element 32, the switch 33 checks with six RS-flip-flops 34-39, an automatic control control unit 40 with keys 41-45 and output elements 46-50, contacts 51-55 of which are included in a chain of zanchty blocks. The diagram shows the mobile machine 56 and the start button 57.

The device works as follows.,

After supplying, the power supply voltage by the button 57 starts the check switch 33. In this case, the logical zero signal is fed to the inputs of the installation in O low-order switch 33 and the inputs of the installation in I of the other bits. At the inverse outputs of the switch triggers, the code 000001 is set. The logical signal O is also fed to one of the inputs of the first element I 29, the output of which at the same time the logical signal O appears, setting the RS-triggers of the recorder 8 to the initial state which is O, and in inverse - 1,

Logic 1 at the forward output of the higher bit n + 1 trigger comm02

The validator 33 is fed to the input of the second delay element 27 and to the input of the fourth AND-24 element.

The delay element begins the countdown, which is 8-10 seconds. The first input of the element AND-24 signals from the generator 23, while the element-AND 24 passes signals

to the input of the fifth element AND-NOT 25, which delays these pulses, since at its second input, this time is the logical o signal ,. Boolean O on inverse output

n + 1 high-trigger flip-flop of check switch 33 through the first delay element 26 is fed to the input of the third IS-NE 21, and a logical signal appears at its output

 1. From the output of the third element AND-NOT 21 logical 1 is fed to the first input of the second element And 30, at the second input of which is G from the output of the element NOT 28, As a result,

the output element And 30 appears the logical signal 1, which is fed to the actuating element 31, which closes its contact in the power supply circuit of the contactor coil

power to the mobile machine 56.

Logic 1 on the inverse output of the trigger 34 of the check switch through the key 4I causes the output element 46 to trip, disconnecting

a contact of which in the circuit of the ground control unit simulates a break of the latter. In this case, the blocking generator on the transistor of the block 5 begins to generate. The pulses from the output winding of the transformer 6 are fed to the base of another transistor operating in the key mode.

With the release of the button 57, the RS-flip-flop 9 of the recorder 8, at the input of which the malfunction is simulated, is transferred to 1, which is fed to one of the inputs of the first AND-19 element. The light-bulb 14 lights up.

20, a logic signal O is received from the direct output of the RS flip-flop 9. This completes the check of the ground monitoring unit,

At the time of opening the contacts

buttons 57 to the first input of the element IS-NOT 25 receives a signal of logical 1, while it passes voltage pulses to the second input through the element IS-NOT 24 from generator 23. These pulses go to the synchronization inputs of the trigger switches 33 checking, changing the code on its inverse outputs of the flip-flops from 000001. to 000010. Logic 1 at the output following the flip-flop 41 switches the output element 47 through the second key 42. The locking contact 52 operates, simulating a decrease in the insulation resistance. Subsequent protection blocks are checked in the same way.

The fifth pulse of the generator 23 sets on the inverted outputs of the triggers of the check switch 33 a code 100000. Logic 1 from the inverse output of the trigger 39 of the check switch 33 is fed to the input of the first

AND-NE element 19. In the case of healthy-2o, a logical O signal appears

All the protection blocks on the remaining inputs of the NAND 19 element are logical 1 signals. In this case, the logical 0 signal from the output of the first N 19 element, through the first 11 element, wrapped the RS-trigger of the recorder 8. At the same time The output of the second element IS-NOT 20 establishes a logical O signal, which is fed to the installation input to 1 of the corresponding trigger of the recorder 8, for example, the trigger 9 is transferred and as a result, the 1 signal appears at its 25 direct output, and on the inverse - O. A corresponding light comes on. The input of the second element AND-NOT 20 is signaled. At the same time, its output

logical.

The second one arrives at the input of the third Elezo D and appears logical 1, which

arrives at one of the inputs of the third element AND-NOT 21, at the second input of which there is at this time a signal 1 from the output of the first delay element 26. The signal O, detected at the output of the second element 21 and 21, arrives at one of the inputs of the second element 30, at the output of which a logical signal O appears, and switches off the actuating element 31.

Claims (1)

Invention Formula A device for checking the health of the protection units, containing an operational power source whose output is connected to the input, a test switch, the output of which is connected to the inputs of the automatic test control unit, a recorder, an actuator, a start button connected to the control input of the test switch, differing from the fact that, in order to improve ease of operation, the first, second delay elements, the first, second and third elements AND –NE, the first, second AND elements, the NOT element, the source of opera tive pitamenta AND-NO element 21, through the second retaining the AND gate 30 in the ON state, the actuating element 31. The first delay element 26 serves to delay the occurrence of the logic signal gg 1 at one of the inputs of the third element NAND 21 at the response time of the triggers of the recorder 8 to the initial state, at which the inverse outputs of these triggers will have a signal 1 and occurrences when the protection blocks of logical O are intact at the output of the second AND-NE element 20.. With the signal of the logical 45 O at the output of the switch trigger 39, the test 33 arriving at one of the inputs of the fourth AND-NOT element 24, the latter stops passing pulses from the generator 23 to the inputs 50 of the trigger synchronization. The device ends the test mode. In the event of a failure of one or several protection blocks, the gg inputs of the first NAND 19 element contain signals of both logical O and logical 1. There is no reset of register 8 triggers to O and the bulbs 14-18 fix the faulty blocks. After the fifth generator pulse 23, with the arrival of the logical I signal at the input of the third AND-HAND 21 element from the inverse output of the flip-flop 39 through the delay element 26, at the input of the third AND-HEP 21 element a logical signal O, which through the second element And turns off the executive element 31, which opens the output contact in the power supply circuit of the contactor coil that supplies power, before troubleshooting. When the insulation resistance drops below the setpoint, a violation of the charging circuit or power wires at the outputs of the respective protection blocks is applied to the installation input to 1 of the corresponding trigger of the recorder 8, for example, the trigger 9 is thrown and as a result, at its 5th direct output 1, and on the inverse, O. A light bulb is associated. The input of the second element AND-NOT 20 is given a signal. At the same time, its signal is at its exhaust. 51361650b neither is made on the generator, the fourth-first trigger is connected to the S-input and the fifth NAND element, while the generator output is connected to the first input of the fourth AND-NOT element, the output of which is connected to the first input of the fifth IS-NOT element, the recorder made on p, according to the number of protection blocks, RS-.TpHrrepax with two inputs, the inputs of which are combined and connected to the output of the first element I, and the S inputs connected to the leads for connecting the corresponding protection blocks, the inverse outputs of each of the mentioned RS-flip-flops are connected with bulbs by numbers at the protection units and with the inputs of the second NAND element, and the direct outputs of each RS flip-flop are connected to the inputs of the first NAND element, the switch is made on n + 1 flip-flops with three inputs, the C-inputs of which are combined and connected to the output n of the item NAND, K input subsequent triggers and is connected to the second input of the fifth NAND element, each of the direct outputs of the flip-flops are connected to the subsequent D-input, and the inverse outputs of the n-flip-flops are connected to the corresponding inputs of the automatic checking unit 10 objects, the inverse output of the n + l-flip-flop is connected to the input of the first NAND element and through the first delay element to the first input of the third NAND element, the direct output n + of the trigger 15 is connected to the second input of the fourth NAND element and through the second delay element connected in series, the NOT element with the first input, the second element AND, the first input of which is connected to the output of the third AND – NOT element, and the output of the second element AND is connected to the input of the executive element. subsequent triggers and is connected to the second input of the fifth NAND element, each of the direct outputs of the flip-flops are connected to the subsequent D-input, and the inverse outputs of the n-flip-flops are connected to the corresponding inputs of the automatic checking unit 0 objects, the inverse output of the n + l-flip-flop is connected to the input of the first NAND element and through the first delay element to the first input of the third NAND element, the direct output of n + trigger 5 is connected to the second input of the fourth NAND element and through the second delay element connected in series, the NOT element with the first input, the second element AND, the first input of which is connected to the output of the third AND – NOT element, and the output of the second element AND is connected to the input of the executive element. PLN 3 ( Compiled by N. Chutchev Editor N. Lazarenko Tehred M. Morgantal Order 6298/53 Circulation 697 Subscription VNII1Sh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, jr. Uzhgorod,. Project, 4 Proofreader B. But ha