ERMAKOV-FEDOROV INDUSTRIAL VOLTAGE FREQUENCY METRE (VERSIONS) Russian patent published in 2009 - IPC G01R23/02 

FIELD: electrical engineering.

SUBSTANCE: group of proposed inventions relates to information measurement and computer engineering and can be used in electrical power engineering for controlling and recording frequency values for each period, average value and frequency standard for a day and averaged frequency values in industrial networks of alternating current with nominal frequency of 50 or 60 Hz, as well as for obtaining signals which control systems for controlling generators, automatic frequency load shedding (AFLS) and automatic frequency limitation (ALF) devices. 1) The first version of the frequency metre comprises an input terminal (IT), low pass filter (LPF), analogue comparator (AC), reference voltage source (RVS), first, second and third monostable multivibrators, rectangular pulse generator (RPG), timer, second, third and fourth registers, first and second adders, corrector, first and second dividers, first register, indicator, multiplier factor unit (MFU), counter, unit for setting number of periods (USNP), digital comparator (DC), fourth and fifth monostable multivibrators; 2) the second version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first and second monostable multivibrators, timer, rectangular pulse generator, first and second registers, indicator, first and second multiplier factor units, multiplier unit, adder, subtracting unit, first and second counters; 3) the third version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first - third monostable multivibrators, rectangular pulse generator, timer, second - fourth registers, first and second adders, corrector, first and second dividers, first register, indicator, multiplier factor unit, first and second counters, decoder, group of k registers, unit for setting number of periods, fourth - seventh monostable multivibrators; 4) the fourth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first - third monostable multivibrators, rectangular pulse generator, timer, random-access memory (RAM), second and third registers, first and second adders, corrector, first and second dividers, first register, indicator, multiplier factor unit, first and second counters, pulse distributor (PD), OR element, flip-flop, unit for setting number of periods, fourth monostable multivibrator; 5) the fifth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first and second random-access memory, timer, rectangular pulse generator, first and second registers, first and second adders, multipler unit, subtracting unit, divider, indicator, first and second multiplier factor units, first - fourth counters, flip-flop, AND element, first - third OR elements, first - tenth monostable multivibrators; 6) the sixth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first and second counters, timer, rectangular pulse generator, register, multiplier unit, adder, subtracting unit, divider, read-only memory, first and second multiplier factor units, first - third monostable multivibrators; 7) the seventh version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, monostable multivibrator, counter, timer, rectangular pulse generator, register, multiplier unit, adder, subtracting unit, divider, read-only memory, first and second multiplier factor units, personal computer, microcontroller, transceiver; 8) the eighth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first and second digital comparators, timer, rectangular pulse generator, register, multiplier unit, adder, subtracting unit, divider, timer clock, first and second multiplier factor units, personal computer, microcontroller, transceiver, first and second random-access memory, read-only memory, units for assigning codes of the highest (UACHF) and lowest (UACLF) frequency, first - fourth counters, first and second flip-flops, first and second AND elements, first - third OR elements, first - ninth monostable multivibrators; 9) the ninth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first - third timers, rectangular pulse generator, first and second digital comparators, clock timer, first - fourth random-access memory, read-only memory, personal computer, microcontroller, transceiver, first - third registers, first and second multiplier units, first - third adders, first and second subtracting units, first and second dividers, first - third multiplier factor units, units for assigning codes of the highest and lowest frequency, first - eighth counters, first - third flip-flops, indicator, first - fourth power amplifiers (PA), first - seventh AND elements, first - sixth OR elements, first - seventeenth monostable multivibrators, first - fourth output terminals; 10) the tenth version of the frequency metre comprises an input terminal, low pass filter, analogue comparator, reference voltage source, first - third timers, rectangular pulse generator, first and second digital comparators, clock timer, first - fourth random-access memory, read-only memory, personal computer, microcontroller, transceiver, first - third registers, first and second multiplier units, first - third adders, first and second subtracting units, first and second dividers, first and second multiplier factor units, units for assigning codes of the highest and lowest frequency, first - eighth counters, first - third flip-flops, indicator, first - fourth power amplifiers, first - seventh AND elements, first - sixth OR elements, first - seventeenth monostable multivibrators, first - fifth output terminals, digital-to-analogue converter, first and second buffer elements.

EFFECT: increased functional capabilities due to possibility of monitoring frequency in industrial electrical networks, recording of the average value and frequency standard for a day, processes for changing frequency during emergencies and at time intervals prior to emergencies, as well as obtaining signals which control systems for controlling generators, automatic frequency load shedding and automatic frequency limitation devices, simplification of the design of the device, increase in its operating speed and accuracy.

10 cl, 10 dwg