SU864194A1 - Device for monitoring and detecting faults in control system thyristorized converter control systems - Google Patents

Description

(54) DEVICE FOR CONTROL AND DETECTION

PROBLEMS OF THIRISTOR MANAGEMENT SYSTEMS

one

The invention relates to electrical measuring equipment and can be used to monitor the working capacity and detect faults of thyristor converter control systems, as well as phase shifting devices of controlled rectifiers in frequency converters. A device for monitoring and troubleshooting is known, comprising a control unit, a measuring unit made on magnetic sensors, a matrix-type analyzer and a display unit I.

A disadvantage of this device is the impossibility of determining the type of failure.

The closest in technical essence to the present invention is a device comprising a clock setting unit, a matching unit, a control unit, a comparison unit, a sum torus, signal conditioners, keys and an SPZ indication unit. The disadvantage of this device is the inability to determine the type and location of failure. reduces the reliability of controls.

The aim of the invention is to increase the reliability of the control. CONVERTERS

 The goal is achieved by the fact that the device for monitoring and detecting faults of the control systems of the thyristor converters containing the control unit, the display unit, the driver, the first comparison unit, the output of which is connected with the first input of the unit

, controls, a threshold element, a NOT element, a trigger, a second, third and fourth comparison blocks and the first, second, third, fourth and fifth waiting multivibrators are introduced, the first and second outputs of the control unit are connected with the corresponding inputs of the threshold element, the first output which is connected to the first inputs of the second and third comparison units and to the inputs of the first,

20 of the second and third pending multivibrators, the output of the first multivibrator is connected to the second input of the second comparison unit and through the element NOT to the second input

Claims (2)

25 of the third comparison unit, the output of which is connected to the first input of the trigger, the second input of which is connected to the output of the second waiting multivibrator and to the input of the driver, the output of which is connected to the third input of the second comparison unit, the output of which is connected to the first input of the first comparison unit , the second input of which is connected to the trigger output, the third input of the first comparison unit is connected to the second output of the threshold element and the first input of the fourth comparison unit, the second input cat cerned through fifth standby mule tivibrator connected to the output of the third monostable multivibrator, the output of the fourth comparator unit connected to the second input of the control unit, measuring the outputs of which are connected to the display unit. Figure 1 shows the functional scheme of the device; Fig. 2 is a diagram illustrating the operation of the device. The device contains a control unit 1, made in the form of a program channel switch, the threshold element 2, the first, second, third, fourth and fifth waiting multi vibrators 3,4,5,6 and 7, the first, second, third and fourth blocks compared to 8, 9, 10 and 11, element 12, the mold rotor 13, trigger 14, the display unit 15. The device operates as follows. When a control command is issued (t (j, fig. 2), the control unit 1 connects threshold element 2 to the corresponding outputs of the control object 16. If the amplitude of the monitored pulses lies within the tolerance, a controlled pulse appears at the first output of the threshold element 2 .coming multivibrators 3, 4, and 5. The first waiting multivibrator 3 produces an impulse of a duration corresponding to the maximum allowable duration of the monitored pulses, the second waiting multivibrator 4 generates an output of an impulse of duration t the corresponding minimum-permissible duration of the monitored pulses, and the pulse duration at the output of the third-one multivibrator 5 is -5 rad., where O-ZG P-. is the sampling interval of the converter (60 ° el. for bridge ter-phase circuits), - the tolerance for the phase shift between the pulses of the object channel. IF the duration of the controlled pulse is ty ,, t (yy (, TO at the end of the pulse of the first standby multi-vibrator 3 through the driver, 13 and the second comparison unit 9 starts the fourth standby multivibrator 7 of excess f zovogo shear generating pulse duration Simultaneously trigger 14 and is retained state is made to this state if t ,,, t | ,, an. Thus, at normal amplitude and duration of the monitored pulses, the signal from the second output of threshold element 2 at time t, (Fig. 2), the first comparison unit 8 generates a signal 1 (command), which through the control unit 1 enters the corresponding cell of the display unit 15. If the duration of the monitored pulse at the first output of the threshold element 2 tf, viH (ends before t, Fig. 2) or it does not exist at all (if the amplitude leaves the tolerance threshold element, the pulse will not let the pulse through), then the fourth waiting multivibrator 7 e zapustits. If TO at time tQ (Fig. 2) by a signal through the driver 13 and the second comparison block 9, the trigger 14 is transferred to the state O. In all three cases, the command (signal 1) by the first comparison block 8 will not be generated and in the corresponding cell of the scoreboard the indication will be alarmed Faulty. At the end of the impulse of the third-party searching multivibrator 5, the fifth standby multivibrator 6 (to, FIG. 2) is triggered, generating a pulse of 2S duration. If the shift between adjacent pulses at the output of the object lies within the tolerance, then the fourth comparison block 11 forms the command signal 1 entering the display unit 15. The display unit 15 has memory elements and a display board. After the end of the test cycle, the boards highlight the cells corresponding to the number of the faulty cell and the type of malfunction. If you reconfigure the multivibrators to smaller tolerances, then the signals of the display board during preventive checks inform you of possible inverter failures and the need to set up the object. Invention device for controlling and detecting malfunctions of thyristor converter control systems, comprising: a control unit, a display unit, a driver, a first comparison unit, the output of which is connected to the first input of the control unit, characterized in that control accuracy, a threshold element, a NOT element, a trigger, a second, third and fourth comparison blocks and the first, second, third, fourth and fifth waiting multivibrators are introduced into it, with the first and second outputs of the control unit connected to the corresponding inputs of the threshold element, the first output of which is connected to the first inputs of the second and third comparison blocks and to the inputs of the first, second and third waiting multivibrators, the output of the first waiting multivibrator is connected to the second input of the second comparison block and. | the second input (of the third block, a comparison, the output of which is connected to the first input of the trigger, the second input of which is connected to the output of the second waiting multipulator and to the input of the former, the output of which is connected to Another input of the second comparator unit, the output of which through the fourth multi-vibrator is connected to the first input of the first comparison unit, the second input of which is connected to the trigger output, the third input of the first comparison unit is connected to the second output of the threshold element and the first input of the fourth comparison unit, the second input of which through the fifth standby multivibrator is connected to the output of the third standby multivibrator, the output of the fourth comparator unit is connected to the second input of the control unit, the measurement outputs of which connected to the display unit. Sources of information taken into account in the examination 1. USSR author's certificate 462147, cl. G 01 R 31/00, 1972. 2. USSR author's certificate 553553, cl. G 01 R 31/28, 1975 (prototype).