RU54209U1 - DEVICE FOR FUNCTIONAL CONTROL OF STATIC AND DYNAMIC ELEMENTS OF THREE-PHASE ELECTRICAL AND ELECTROMECHANICAL SYSTEMS - Google Patents

Abstract

The utility model relates to the field of electromechanics, namely to the use of information processing tools in electromechanics, and can be used for functional control of three-phase transformers, power lines and squirrel-cage induction motors.

The objective of the utility model is to create a device for the functional control of power lines, transformers and induction motors in operating mode.

This object is achieved in that the device for the functional control of static and dynamic elements of three-phase electrical and electromechanical systems contains an analog-to-digital converter, the inputs of which are connected to current and voltage transformers. The outputs are connected to the ring memory unit and the programmer, and the outputs of the ring memory are connected to the inputs of the programmer, the outputs of which are connected to the inputs of the comparison unit and to the inputs of the segment indicators. The input unit for exemplary coefficients, the memory unit and the comparison unit, the outputs of which are connected to the inputs of the segment indicators, are connected in series.

Description

The utility model relates to the field of electromechanics, namely to the use of information processing tools in electromechanics, and can be used for functional control of three-phase transformers, power lines and squirrel-cage induction motors.

No analogues are currently known.

The objective of the utility model is to create a device for the functional control of power lines, transformers and induction motors in operating mode.

The task is achieved in that the device for the functional control of static and dynamic elements of three-phase electrical and electromechanical systems contains an analog-to-digital converter, the inputs of which are connected to current and voltage transformers, and its outputs are connected to a ring memory block and a programmer. The outputs of the ring memory are connected to the inputs of the programmer, the outputs of which are connected to the inputs of the comparison unit and to the inputs of the segment indicators. The input unit for exemplary coefficients, the memory unit and the comparison unit, the outputs of which are connected to the inputs of the segment indicators, are connected in series.

Thanks to the proposed device designs, it became possible to perform functional control of static and dynamic elements of three-phase electrical and electromechanical systems.

Figure 1 - presents a functional block diagram of a device for the functional control of static and dynamic elements of three-phase electrical and electromechanical systems.

The proposed device can be implemented, for example, using a functional block diagram, which is presented in figure 1. It contains: analog-to-digital Converter 1 (ADC); ring memory unit 2 (KP); programmer for calculating diagnostic coefficients 3 (P); comparison unit 4 (BS); unit input model coefficients 5 (input unit); memory block 6 (PSU).

To the inputs of the analog-to-digital Converter 1 (ADC) are connected transformers of current and voltage (not shown in figure 1). The outputs of the converter 1 (ADC) are connected to the inputs of the ring memory block 2 (KP) and to the inputs of the programmer 3 (P). The outputs of the ring memory block 2 (KP) are connected to the inputs of the programmer 3 (P). Programmer outputs

3 (P) are connected to the inputs of the comparison unit 4 (BS) and to the inputs of the segment indicators (not shown in FIG. 1). The outputs of the input unit exemplary coefficients 5 (input unit) are connected to the inputs of the memory unit 6 (PSU). The outputs of the memory unit 6 (PSU) are connected to the inputs of the comparison unit 4 (BS). The outputs of the comparison unit 4 (BS) are connected to the inputs of the segment indicators (not shown in figure 1).

As analog-to-digital Converter 1 (ADC) can be selected, for example. analog-to-digital converter of the MAX 186 series (12 bits). The ring memory block 2 (KP) and memory block 6 (BP) can be implemented on an external rewritable Amtel AT25L256 data memory (32 kB). Programmer 3 (P) can be executed on the Atmel AT89S53 series 51 microcontroller.

Upon receipt of the analog signals of currents and voltages of three phases from current and voltage transformers (not shown in Fig. 1) to the input of the analog-to-digital converter 1 (ADC), they are converted into a digital signal with the number N of discrete values of the output signal of the analog-to-digital converter input signal period. Digitized signals of currents i _A (t _j ), i _B (t _j ), i _C (t _j ) voltages u _A (t _j ), u _B (t _j ), u _C (t _j ) measured at time t _j arrive simultaneously at the input of the ring memory block 2 (KP) and at the input of the programmer 3 (P). In the block of ring memory 2 (KP), current values of currents i _A (t _j ), i _B (t _j ), i _C (t _j ) and voltages u _A (t _j ), u _B (t _j ), u _C (t _j ) for use at a subsequent point in time. From the outputs of the block of ring memory 2 (KP), the signals i _A (t _j-1 ), i _B (t _j-1 ), i _C (t _j-1 ) and u _A (t _j-1 ), u _B (t _j-1 ), u _C (t _j-1 ) corresponding to the time t _j-1 , go to the input of the programmer 3 (P). At the same time, current signals from the outputs of analog-to-digital converter 1 (ADC) are received at the corresponding inputs of programmer 3 (P). In the programmer 3 (P) the following expressions calculate the diagnostic coefficients:

where N is the number of discrete values of the output voltage / current signal of the analog-to-digital Converter for the period of the input signal.

From the outputs of the programmer 3 (P), the signal is fed to the inputs of the comparison unit 4 (BS) and to the corresponding inputs of the segment indicators (not shown in figure 1). At the stage of system setup, using the input unit of exemplary coefficients 5 (Input unit), the values of the exemplary coefficients found by a similar procedure for obviously known load are set, and the value of the permissible difference Δγ ^H whose value is found by the following expressions:

where, as the allowable difference Δγ ^H take the largest value from the differences Δγ ₁ , Δγ ₂ and Δγ ₃ ;

From it, the signal is fed to the input of memory unit 6 (PSU). From the outputs of the memory unit (6) (PSU), the signal is supplied to the comparison unit 4 (BS), where the difference between the calculated and reference diagnostic coefficients is calculated:

where Δγ _f - the difference between the values of the calculated and exemplary diagnostic coefficient for one of the phases;

and comparing them with acceptable Δγ ^H values. From the output of the comparison unit 4 (BS), the signal about the serviceability or malfunction of the controlled three-phase system and the values of the diagnostic coefficients for each phase are fed to the corresponding inputs of the segment indicators (not shown in Fig. 1). Evaluation of the health of the system for each phase is carried out under the condition that the difference in the values of the calculated and model diagnostic coefficients for one of the phases is less than or equal to their allowable difference Δγ ^H.

Claims (1)

A device for the functional control of static and dynamic elements of three-phase electrotechnical and electromechanical systems, characterized in that it contains an analog-to-digital converter, the inputs of which are connected to current and voltage transformers, and the outputs are connected to a ring memory block and a programmer, and the ring memory outputs are connected to the inputs of the programmer, the outputs of which are connected to the inputs of the comparison unit and to the inputs of the segment indicators, in addition, the image input unit is connected in series coefficients, a memory unit and a comparison unit, the outputs of which are connected to the inputs of the segment indicators.