SU744828A1 - Device for continuous monitoring of the presense and proper alternation of phases of three-phase voltage - Google Patents

Description

The generator of the former is connected to the input of a pulse former of the corresponding phase, the outputs of the inverter transformer co-generators are co-connected with the analysis unit of the presence of the façade code of which through the memory block 5-53, the leech phases are connected to one of the inputs of the OR element, and the third one. the code of the memory block of the correctness of the redox phase and the first input of the pulse-shaping unit of the ZPF, the outputs of pulsed 1x drivers are connected to the block of phase sequence correctness analysis, the first output of which is connected to the first input of the memory block the phases are alternated, and the second output is connected to the third input of the FPP pulse shaping unit. At the same time, the second input of the FAP pulse shaping unit is connected to the output of the first pulse shaper, and the first output of the phase alternation memory block is connected to another input of the OR element, the second output of the phase alternation memory block is connected to the fourth input of the ZFF pulse shaping unit, the second input The phase rotation memory block is also connected to the output of the third pulse shaper, and the output of the FFT shaper block is connected to the BTOptOM input of the phase memory block.

A block diagram of a device for continuously monitoring the presence and correctness of alternating phases of a three-phase voltage is shown in the drawing.

The device for continuous monitoring of the presence and correctness of phase alternation of three-phase voltage consists of two paths - a phase presence tract and a phase sequence correctness tract and contains phase transformersformers 1-3 (for each phase) phase presence analysis unit 4 and memory presence unit 5 phases form a path to control the presence of phases.

The pulse formers 6-3 (for each phase), the phase analysis correctness unit 9, the phase alternation unit 10 naJNiHTH, and the SPP pulse shaping unit 11 form the phase rotation control path.

Common devices for both paths are the OR 12 element and the output actuator 13.

A certain part of the phase input voltage is supplied to the converter-Shaper 1-3 corresponding to each phase, where the sinusoidal voltage is transformed into a succession of rectangular pulses whose duty cycle is equal to two.

Obtained from sinusoidal voltage rectangular pulses of phase; B shifted relative to the pulses of phase B by 120 and relative to phase A by 240 °.

 Three pulsed terminals from the outputs of the corresponding phase converters and shapers 1-3 are fed to block 4 for the analysis of the presence of phases. Here is the analysis

Q pulse sequences for at

in the absence of one, a color or all three pulse sequences, an alarm signal is generated, which is stored by the memory block 5 of the presence of phases. Avark signal is issued from block 4

5 of the analysis also in case of mismatch of the phases of the input voltage by the value of more bO,

In the presence of all three phases and the disagreement between them, no more than

0 60 signaling fails and block 5 memorizes cKTV.sn normal operation.

At the same time, a certain part of the phase input voltage is also supplied to the corresponding for each phase pulse formers 6–8, where the formation of narrow pulses occurs, the leading front of which corresponds to the beginning of the phase.

From the outputs of pulsed formers 6-8, pulse sequences in-phase with phases A, B and C are fed to block 9 for analyzing the correctness of phase alternation. This block analyzes the temporal location of the pulses relative to each other.

If they are incorrectly located, i.e. with the wrong alternation

input phase block

analysis is

an alarm signal that is stored by the phase rotation memory unit 10.

If they are correctly positioned, the alarm signal is not issued, block 10 memorizes the signal, normal operation

From both paths - from the phase control path and the phase rotation path control path, the signal is normal operation or alarm signals, depending on the input voltage characteristics, through the OR 12 element arrive at the output actuator 13. The device 13 draws into the external circuit or signal Normal operation, when in both paths an emergency state of the input voltage is not recorded, or an alarm signal, when an emergency state of the input voltage is recorded in one of the paths or in both.

Claims (2)

A block 11 forms a BFM pulse, which sets the naiviHTn block 5 to its initial state at the initial moment of operation and at the end of the emergency situation at the input of the device. For installation at the initial time of the memory unit 10 to the initial state, a reset pulse is generated in the phase analysis unit 4. The proposed device for continuous monitoring of the presence and correctness of phase alternation of three-phase voltage is universal and allows simultaneous continuous monitoring of the presence of phases and control of the correctness of their alternation; control of three-phase input voltage t in a wide range of values from a few to several hundred volts j control of three-phase input voltage in a wide range of operating temperatures from -60 ° to +, in addition, control of not only three-phase power circuits, but also low power for low energy consumption from a controlled three-phase circuit. The described device is made on the basis of elements of discrete automation and computer technology - on general-purpose integrated circuits, which classifies this device as a third-generation device. The device does not have adjustment elements and does not require setting certain optimal modes. All of the above will expand the scope of application of the device and eliminate the need to develop a number of devices for monitoring voltages of various magnitudes. Apparatus of the Invention A device for continuous monitoring of the presence and correctness of alternating phases of a three-phase voltage, comprising three transformer converters connected to the phases of a controlled network, an OR element, to an output that is connected to an actuator, characterized in that. In order to expand functionality and increase speed, it is additionally equipped with a phase presence analysis unit, a phase presence memory unit, three pulse shapers, a phase rotation correctness analysis unit, a phase rotation correctness memory unit and an SFR pulse shaping unit, and each phase the converter-former is connected to the input of the pulse former corresponding to the phase, the outputs of the phase converters-formers are connected to the phase presence analysis unit, in the stroke of which through the memory block of the presence of phases is connected to one of the inputs of the OR element, as well as to the third input of the phase sequence correctness memory block and the first input of the PFF pulse shaping unit, you, the pulses of the pulse drivers are connected to the phase alternation analyzer, the first the output of which is connected to the first input of the memory unit of the phase alternation correctness, and the second output to the third input of the FPS pulse formation unit, while the second input of the FPS pulse forming unit is connected to the output of the first pulse The first driver and the first output of the phase sequence correctness memory block is connected to another input of the OR element, the second output of the phase sequence correctness memory block is connected to the fourth input of the ZPF pulse shaping unit, the second input of the phase alternation memory block is also connected to the third pulse output shaper, and the output of shunt blocker FPP is connected to the second input of the memory block in the presence of phases. Sources of information taken into account in the examination 1. The author's certificate of the USSR 366526, CL, H 02 H 3/24, 1973. 2. Authors certificate of the USSR 586404, cl. H 02 H 3/24, 1975. Phase A