SU1406685A1 - Amplifier diagnosis device - Google Patents

Abstract

The invention relates to electrical engineering. It is not the invention to expand the functional capabilities of the device for diagnostics of the rectifier and increase the reliability of the diagnostic results. The inputs of the code comparison block are supplied with a nipsing code from the output of the binary decoder, which characterizes the state of the gates, and a cyclic code from the output of the time interval master, consisting of one logical unit that does not accommodate, but is discharged depending on the time interval. The code comparison block analyzes incoming codes and generates fault signals at the output, each of which corresponds to a separate indicator. The goal is achieved by localizing each fault indicating its type and location. 9 il. WITH

Description

05 05 00 ate

The invention relates to electrical engineering and can be used to protect and diagnose power converters of process automation systems,

The purpose of the invention is to expand the functionality of the device for diagnosing the rectifier and to increase the reliability of the diagnostic results.

FIG. 1 shows a functional rectifier circuit; in fig. 2 is a functional diagram of the time interval setting unit (a) and its code table of its states; in fig. 3-6 - functional

153, the D-inputs of which are combined and connected to the signal source “1 (terminal 167). The installation inputs of the D-flip-flops 142-153 are connected to the output of the key element 168. The flip-flops 142-153 are equipped with light indicators 154-165.

These elements have the following characteristics.

Diodes 1-6 are elements with one-way conductivity.

The conductivity sensors 7-12 form the signal "1" on the output, provided the corresponding valve 1-6 is in the open state. If diodes 1-6 are closed, at the outputs of each of the sensors 7-12

device comparison code; The signal "Oh, fig. 7 is a timing diagram of the signal-block 13 performs the selection of time interval master inputs; Nervalov time between points naturalfig. 8 and 9 are code tables of the state switching of a three-phase rectifier voltage system and diagnostics channels.

Neither its condition. Copper Parameters 70-75 (Fig. 2a) form the structure of the device (Fig. 1), enter 20 at the output of "1, when the level of voltage 1-6, conductivity sensors 7-12, or their the first input exceeds the driver of 13 time intervals with input 14-25 and output 26-31 terminals, the binary decoder 32, the block 33 comparing codes and indications with inputs

25

the signal width at the second input of the comparator.

Elements 76-117 go to state "4, when signals are simultaneously present on their inputs".

34 - 63, reducing transformer 64, input 65-67 and output 68 and 69 terminals rectifier.

Unit 13 (Fig. 2a) contains comparators 70-75 and elements 2I 76-81.

thirty

The selectors 130--141 output the signal "I, if its duration exceeds a certain predetermined value.

The triggers 142-153 switch to the state "1, when the signal" 1 is applied to their C-input. Translation Triggers 142-153

The unit 33 comparison codes (Fig. 3-6) includes elements 2I 82-117, elements 4ILI 118-123, elements 2ILI 124-129, selectors 130-141 pulse duration, D-flip-flops 142-153, light indicators 154 -165, terminal 166 for connecting the 5 to the zero state is produced by supplying the source "O, terminal 167 for setting the priority setting R-input of the source signaling switch" I, the key element "O. L68 key toggles hand 168.

The luminescence of the corresponding indicator 154--165 occurs in the presence of the signal “1.

FIG. 1-9, the following notation is entered: A, B, C - three-phase voltage system; 45 QI Qf - output signals of the block 13, respectively, for terminals 26-31; Q- - Qi2 - output signals of conductivity sensors 7-12, respectively; a, b, c, d, e, f, k are points of a natural com mutation; ks.1 - short circuit in the i-ro circuit of the diode, where i 1, 2, 3, 50 4, 5, 6 (Fig. 3); p, i is a break in the circuit of the i-ro diode, where i I, 2, 3, 4, 5, 6 (Fig. 3); A, C; C, B; B, C; A, B; B, A and C, A are the output signals of comparators 70-75 (Fig. 2a); PC - position code.

The device works as follows.

Diodes 1-6 are connected in a three-phase bridge circuit. Sensors 7-12 of conductivity are connected in parallel with the power diodes 1-6. The decoder 32 is connected to the outputs of the sensors 7-12 conductivity. The unit 13 is connected to the network terminals via a step-down isolation transformer 64. The outputs of the units 13 and 32 are connected to the inputs 34-63 of the code comparison unit 33.

Comparators 70-75 contain two inputs. The first inputs of elements 70, 73 and the second inputs of elements 74 and 75 are connected to phase A. The first inputs of elements 72 and 74 and the second inputs of elements 71 and 73 are connected to phase B. The second inputs of comparators 70 and 72 and the first inputs of comparators 71 and 75 are connected to phase C. The outputs of the comparators 70-75 are connected to the corresponding inputs of elements 2I 76 - 81.

The outputs of the elements 82-129 through the selectors 130-141 pulse duration is connected to the C-inputs of D-flip-flops 142

55

When the I-6 elements of the power section of the circuit are in the open state, the following diodes are in pairs.

not at their first entrance exceeds the

five

the signal width at the second input of the comparator.

Elements 76-117 go to state "4, when signals are simultaneously present on their inputs".

Elements 118-129 are switched to state "1 with" 1 at least on one of the inputs.

thirty

The selectors 130--141 output the signal "I, if its duration exceeds a certain predetermined value.

The triggers 142-153 switch to the state "1, when the signal" 1 is applied to their C-input. Translation Triggers 142-153

 5 in the zero state of production with the supply “d” priority installation R-input signal The device operates as follows.

When the I-6 elements of the power section of the circuit are in the open state, the following diodes are in pairs.

utation interval

a-b b-c c-d d-e e-f

f-k

com- open diodes

1, 1.6

3.6 2.3 2.5 4.5

In this case, the outputs of the conductivity sensors 7-12 form a sequence of 0 and 1 (Fig. 6, lines 1-6, signals Q- - Qi2), and at the outputs of the 32nd terminal there are signals equivalent to a numeric decimal sequence 9 33; 36; 6; 18; 24 (pc)

With the help of block 13, pulses are selected, the duration of which corresponds to a certain co-mutation interval. Block 13 way.

(Fig. 2a) works as follows

The comparator 70 compares the voltage of phases A and C (Fig. 7a) and a signal is generated at its output. A, C (Fig. 76), the duration of which is equal to the interval a d (Fig. 7a). The comparator 71 compares the voltage levels of phases C and B, and the duration of its output pulse is equal to the interval e - b (Fig. 7c).

With the help of element 2И 76, to the inputs of which the output pulses of the comparators 70 and 71 are fed, the signal "1" (Fig. 7a) is formed, the duration of which corresponds to the interval a-b.

Similarly, with the help of the coders 70-75 and e. Terminals 77-81 (Fig. 2a; Figs. 7a-g) are signals (Fig. 7i - n), the duration of which corresponds to a certain time interval, indicated in Figs. 2; H and FIG. 7 h - in brackets.

In accordance with the above, the block 13 generates at outputs 26-31 a code sequence (FIG. 26) with one "1 and five" O, with what "1" moves sequentially from the previous bit into the next one, thus forming the most code points. combinations typical for ring counters.

Unit 13 plays the role of a driver of a reference ring CLA, with respect to which the code at the output of the decipher is compared, 32.

FIG. 8 presents a full table of code states of a recipe.

five

0

five

0

five

0

five

Diagnostic tool, where row.m. 1-6 corresponds to the good condition of the power part of the circuit.

Consider lines 7-12 for section a-b, when the sequence of 13 corresponds to six possible faults; 25; 41; 1 and 8. Here, if single faults are taken as a basis, there are four possible short-circuit faults. (к.з.2; к.3.3; к.3.5; к.з.6) and two variants р (р. 4; р.1), and the number of possible short circuits and r. is common to any of the following in the table in FIG. 8 switching intervals.

For the interval bc (Fig. 8, lines 13-18) 37; 41; 49; 1 and 32. Comparing with interval a-b, we find identical lines 10; 15 () and 11, 17 (PC I). However, the interval a - b is the reference code 100000 (Qi - QH), and the interval b - c is 010000. Therefore, if we compare the PC at the output of block 32 with the code at the output of block 13, then in the diagnostic system there are no identical code combinations that would interfere with the process of localizing the nature and location of the malfunction in the power section of the VP design.

Summarizing the results shown in FIG. 8 for lines 7-42, it is possible to identify a sequence of PCs that characterizes the faulty state of the transducer. This sequence includes d numbers; one; 2; four; 7; eight; eleven; 13; 14; sixteen; nineteen; 22; 25; 26; 28; 32; 35; 37; 38; 41; 44; 49; 50; 52 and 56 (Fig. 9a).

Assign the position of the input terminal of the block 33 (Fig. 9a), the terminals 40 63 modes for each number of the upper row of the table to each number from this sequence.

In addition, summarizing the results shown in FIG. 8 (the second column of the world), it can be concluded that for the mode “K.z. I is characterized by PC 7; nineteen; 25; 37, dl. "R. 1 - 32 (Fig. 96, first column). Malfunction type "K.Z. 2 has a PC 11; 26; 35; 38, and “R. 2 - PK 4; 16 etc. In this case, the number 25 is as in k. 5, and when k.z. 37 takes place for shortly. I and for shortly. The same can be said) and d, 1 “R.

the number 25 encounter- 1, the number 3, etc. regime

0

five

However, for example, PC 25 (cc 1) corresponds to auxiliary code 000001 (Fig. 8, interval f - k), and for (cs 5) corresponds to auxiliary code 100000 (interval a-b). Therefore, considering the PC at the output of block 32 in combination with the code at the output of block 13, it is possible to achieve absolute recognition of the nature and location of the malfunction in the VP design. This operation is performed with a noMonibio unit 33 (Fig. 3-6).

Here in brackets for pos. 40 () 3 input terminals of block 33 indicate the values

what is the coincidence of the codes 100000 and 8 (Fig. 8, line 12) results in the appearance of “1 at the output of element 86 (Fig. 3), which entails the triggering of the trigger 143 and the luminescence of the indicator 155. Others work similarly The cells of block 33 shown in FIG. , with indications produced by a cell with four input elements 2I and one 4ILI, and the indication p. - through the channel with the input-10 circuit based on two elements 2I and one element 2ILI (Fig. 3, 4-6). Thus, localization of the fault site is carried out with simultaneous diagnosis of the qualitative side of failure (short-circuit or p.). As a result, the expansion — the faulty state of the valve I is characterized by the functionality of a sequence of numbers 7; 19; and the reliability of the diagnostic process; 25 37 (cz. 1) and 8; 32 (P. 1) (FIG. 96), a position code generated at the outputs of the decoder 32.

Before the start of the circuit operation, the triggers 142-153 are set to the zero state by applying the signal "O" to the R input, by briefly transferring the key 168 to terminal 166.

Inputs D and R of the flip-flops 144-153 in FIG. 4-6 are not shown in order to simplify the circuit of the block 33. Their connection corresponds to the circuit in FIG. 3

Consider the circuit in FIG. 3, which is used to recognize the failure of the valve I.

received on the basis of a generalized table of code states of the rectifier (Fig. 8, lines 7-42).

Suppose that on the interval d - e there was a short circuit in the circuit of valve 1. Then at the input 43 of the element 33 (the output of the decoder 32) appears "1 corresponding to the number 7 (Fig. 8, line 25; Fig. 9a). At the same time, the dial 13 is in the state 000100 (Fig. 8, line 25-30) and "1 is present at terminal 37 of the block 33. As a result, element 82 (Fig. 3) goes into one state and the signal" 1 is fed through elements 118 and 130 to the C input of the trigger 142. At the same time, the latter switches to "1," as the D input is fed to "1, and the state of the R input corresponds to the resolution to switch the trigger to a state that has D entrance.

If k.z. 1 takes place in the c-d interval (Fig. 8, line 19), then element 85 is switched to the output one state (Fig. 3), since the inputs 36 and 56 of the code comparison block 33 contain "1.

Mode "R. 1 is characterized by the numbers 8 and 32 (Fig. 96; Fig. 8, lines 12 and 18), in the prirovanie.

The selectors 130-141 eliminate the false triggering of the trigger 142-153 by the false 20 short-term impulses that are the result of the natural variation of the parameters of the conductivity sensors 7-12.

Claims (1)

Invention Formula 25 A device for diagnostics of a rectifier made according to a three-phase bridge circuit, containing sensors for conducting the syu.v valves, indicators and time interval adjuster, the inputs of which are intended to be connected to the input AC terminals of the diagnosable rectifier differing from that, in order to expand the functionality and increase the reliability of the diagnostic results, a binary decoder and a code comparison block are entered into it, while the inputs of the binary decoder are connected to the output With the conductors of the sensors, the outputs of the binary decoder and the time interval adjuster are connected to the inputs of the code comparison unit, the outputs of which are connected to the indicators. thirty 35 rovani The selectors 130-141 eliminate the false triggering of the trigger 142-153 by false short-term impulses that are the result of the natural variation of the parameters of the conductivity sensors 7-12. Invention Formula A device for diagnosing a rectifier made according to a three-phase bridge circuit that contains sensors of conduction of circuit valves, indicators and time interval adjuster, the inputs of which are intended to be connected to the input AC terminals of the diagnosed rectifier that differs from , in order to expand the functionality and increase the reliability of the diagnostic results, a binary decoder and a code comparison block are entered into it, and the inputs of the binary decoder are connected to the output s provodi.mosti sensors, and outputs a binary decoder setpoint slots are connected to inputs code comparing unit which outputs are connected with the indicators. I 1 7.1 I 7.M 7.1 I s.o. fjgj f4,4 tf, qs oz q qs oe la-c) (c-c) (c-cf) (d-e) (e-f) (J-K) a ABC 65Q 66 Q 670 ) CNj - G O OKCOCh N S), C I / -160 Fig l i6 “O Rig. 7