SU1002976A1

SU1002976A1 - Active power measuring device

Info

Publication number: SU1002976A1
Application number: SU813313389A
Authority: SU
Inventors: Вилий Лукич Соседка; Иван Федотович Кочура; Давид Исаакович Пружанский; Людмила Федоровна Коломойцева; Владислав Николаевич Серостанов
Original assignee: Днепропетровский Ордена Трудового Красного Знамени Горный Институт Им.Артема
Priority date: 1981-07-09
Filing date: 1981-07-09
Publication date: 1983-03-07

Description

Изобретение относитс к электроизмерительной технике и может &лгь использов ано при построении ваттметров переменного тока.The invention relates to electrical measuring technique and may & l use ano when building ac wattsmeters.

Известно устройство дл измере .ни активной мощности, содержащее анализаторы спектра тока и напр жени , выходы КОТ01ЖГХ через вь1числительныё блоки, каждый из которых включает в себ перемножителй JH сумматор , и многовходошлй сумматор подключены к входам регистрирующего блока С A device for measuring active power is known, which contains current spectrum and voltage analyzers, KOT01GGH outputs through numerical blocks, each of which includes a JH adder multiplier, and a multiple input adder are connected to the inputs of a recording unit C

Известное устройство обладает низкой надежностью, так как спектРсшьный анализ производитс по полной схеме ортогональных функций, что усложн ет анализаторы спектра.The known device has low reliability, since the spectrum analysis is performed according to the full scheme of orthogonal functions, which complicates the spectrum analyzers.

Цель изобретени - повышение надежности .The purpose of the invention is to increase reliability.

Поставленна цель достигаетс тем, что в устройство, содержащее; анализаторы спектра тока и напр жени , первые входы которых подключены к входным шинам, и умножитель, выход которого через .сумматор подключен к входу регистрирующего блока , введены коммутатор, блок управлени , логический блок и блок управлени анализаторами, первый вход которрго через блок выделени знака чПОД1слючен к первому входу анализа .тоЬа спектра напр жени , перва и втора группы выходов которого непосредственно и через ангшизатор спектра тока сортветственнб подключены к первой и второй группём входов коммутатора , первые.выходы которого подключе1ш к входамумножител , The goal is achieved by the fact that the device contains; current and voltage spectrum analyzers, the first inputs of which are connected to the input buses, and a multiplier, the output of which is connected through the accumulator to the input of the registering unit, are introduced a switch, a control unit, a logic unit and an analyzer control unit, the first input of which is connected through the character extraction unit hODOD1 To the first input of the analysis. Toba voltage spectrum, the first and second groups of outputs of which are directly and via the current spectrum spectrum aggregator, are connected to the first and second groups of switch inputs, the first. Exit to which podklyuche1sh vhodamumnozhitel,

10 га.втор-ге выходы через логический блок - к знаковому входу сумматора, управл ющий вход которого подключен к первому выходу блока управлени , остсЦ1ьные выходы которого подклю15 чены Xv входу управлени логического блока, к третьему:входу коммутатора .и к второму входу; анализатора спектра напр жени , третий вход и третий выход KOTopoiX) подключены к первому The 10 hectare second outputs through the logic block - to the sign input of the adder, the control input of which is connected to the first output of the control unit, the remaining outputs of which are connected Xv to the control input of the logic block, to the third: switch input .and to the second input; voltage spectrum analyzer, the third input and the third output KOTopoiX) are connected to the first

20 выходу и второму входу блока управлени анализаторами, второй выход которого подключен к входу блока управлени .20 to the output and the second input of the analyzer control unit, the second output of which is connected to the input of the control unit.

На чертеже приведена функциональ25 на схема устройства.The drawing shows the functional25 on the device diagram.

Claims

The device contains voltage spectrum analyzers 1 and current 2, the first inputs of which are the device inputs, analyzer control block 3, the first input of which is connected to the first input of the voltage spectrum analyzer 1 and the first output of the block 4 5 control outputs which are connected to the control inputs of the voltage spectrum analyzer 1, switch 6, logic block 7 and adder 8, whose information inputs through the multiplier 9 are connected to the first outputs of switch 6, the output to the input register 10, and the sign input through logical block 7 to the second outputs of switch b, the first and second information inputs of which directly and through the analyzer 2 of the current spectrum are connected to the first and second outputs of the analysis of the voltage spectrum torus 1, the second input and the third output of which is connected to the second output and the second input of the analyzer control unit 3. The device works as follows. The inputs of the device are supplied with the current values of voltage and current in the circuit under study. At the moment when the voltage passes through zero in a definite direction, the block 4 of the sign triggered the block 3 of the analyzer control, which in turn starts the generator of orthogonal functions, which enter into the structure of the voltage aggregator 1 of the voltage spectrum. The output signals of the generator of orthogonal functions through the second outputs of the analyzer 1 voltage spectrum are fed to the inputs of analyzer 2 of the current spectrum, which does not have its own generator of orthogonal functions. At the end of the spectral decomposition from the third voltage output of the voltage spectrum analyzer, the analyzer control unit 3 receives the signal causing the latter to start the control unit 5, which gives its outputs a series of pulses to. Upon the arrival of a pulse, the switch 6 connects the outputs of the single-pitch harmonics of voltage spectrum analyzers 1 and current 2 to the inputs of the multiplier 9 and logic block 7, which analyzes the signs of these quantities, so that with the same signs a control signal 8 is output to the controller 8, corresponding to the addition, and at different - subtraction. I Since the adder 8 is the accumulating adder, by summing the products of all the output values of single-pitch harmonics of the voltage and current, the value corresponding to the value of the active power that is output to the recording unit 10 is accumulated. Synchronization of the spectral decomposition period by the input signal it allows to limit the decomposition only to odd functions, which simplifies the spectrum analyzers by half and significantly improves the reliability of the device. The use of a single generator of orthogonal functions makes it possible to increase the measurement accuracy by synchronizing the analysis of the voltage and current spectra. Claims An apparatus for measuring active power, comprising current and voltage spectrum analyzers, the first inputs of which are connected to the input buses, and a multiplier, the output of which is connected through an adder to the input of the recording unit, in order to increase the reliability of the devices. A switch, a control unit, a logic unit and an analyzer control unit are entered into it, the first input of which is connected to the first input of the voltage spectrum analyzer through the character extraction unit, the first and second output groups Dov which directly and through the analyzer. the current spectrum is respectively connected to the first and second groups of inputs of the switch, the first outputs of which are connected to the multiplier inputs, and the second outputs through a logic block to the sign input of the adder, the control input of which is connected to the first output of the control unit, the other outputs of which are connected to the control input ) 1 logical unit to the third input of the switch and to the second input of the voltage spectrum analyzer, the third input and output of which are connected to the first output and the second input of the analyzer control unit , the second output of which is connected to the input of the control unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 613262, cl. G 01 R 21/06, 21.12.76.