SU976397A1

SU976397A1 - Device for determination of 90 degree phase shift

Info

Publication number: SU976397A1
Application number: SU802894922A
Authority: SU
Inventors: Владимир Сергеевич Гурьянов
Original assignee: За витель
Priority date: 1980-03-19
Filing date: 1980-03-19
Publication date: 1982-11-23

Description

Изобретение относится к Фазометрии, к формированию и определению квадратурных напряжений.The invention relates to Phasometry, to the formation and determination of quadrature stresses.

Известно устройство для определения 90-градусного фазового.сдвига, содержащее фазовращатель управляемы^ усилитель и нуль-индикатор [1].A device is known for determining a 90-degree phase shift containing a phase shifter controlled by an amplifier and a zero indicator [1].

Недостатком такого устройства является значительная погрешность определения квадратуры.The disadvantage of this device is a significant error in determining the quadrature.

Известно также устройство для определения 90-градусного фазового сдвига, содержащее делитель напряжения, выполненный в виде трансформатора с вторичной обмоткой,’ разделенной ’пополам ис~подключенными к этой обмотке последовательно включенными конденсатором и резистором £ 2 J.It is also known a device for determining a 90-degree phase shift, containing a voltage divider made in the form of a transformer with a secondary winding ’divided’ in half and connected to this winding by a series-connected capacitor and resistor £ 2 J.

Недостатком известного устройства является относительная низкая точность 10,1-0,05 градуса.A disadvantage of the known device is the relative low accuracy of 10.1-0.05 degrees.

Цель изобретения - повышение точности.The purpose of the invention is improving accuracy.

Цель изобретения достигается тем что устройство для определения 90градусного фазового сдвига, содержащее генератор,трансформатор, первичная обмотка которого соединена с генератором, а вторичная - со средней точкой, резистор и конденсатор, снаб-, жено дополнительной обмоткой трансформатора, переменным резистором, нуль-индикатором, вспомогательным 5 фазовращателем, регулятором напряжения, усилителем мощности и переключателем с двумя переключающимися контактами, причем добавочная обмотка трансформатора через последовательно Ю соединенные вспомогательный фазовра, «щатель, регулятор напряжения и усилитель мощности соединена одним вы.водом со средней точкой вторичной обмотки трансформатора, а другим - с ,первым нормально замкнутым и вторым нормально разомкнутым контактом переключателя, вторые выводы которых соединены соответственно с выводами вторичной обмотки трансформатора, а выводы подвижных контактов подсоединены к последовательно соединенным конденсатору, переменному резистору и резистору, нуль-индикатор присоединен к средней точке вторичной обмотки трансформатора и общей точке, сое динения резистора и переменного резистора.The purpose of the invention is achieved in that a device for determining a 90 degree phase shift, comprising a generator, a transformer, the primary winding of which is connected to the generator, and the secondary with a midpoint, a resistor and a capacitor, is equipped with an additional transformer winding, a variable resistor, a zero indicator, auxiliary 5 phase shifter, voltage regulator, power amplifier and switch with two switching contacts, and the additional transformer winding is connected in series through The second auxiliary phase, “switch, voltage regulator and power amplifier, is connected with one output to the midpoint of the secondary winding of the transformer, and the other with the first normally closed and second normally open contact of the switch, the second terminals of which are connected respectively to the terminals of the secondary winding of the transformer, and the conclusions of the movable contacts are connected to a series-connected capacitor, a variable resistor and a resistor, a zero indicator is connected to the midpoint of the secondary transformer winding Ator and the common point of the connections soy resistor and a variable resistor.

На чертеже приведена схема устройства для определения 90-градусного 30 фазового сдвига.The drawing shows a diagram of a device for determining a 90-degree 30 phase shift.

разцовых средств, С использованием изобретения может быть создан эталон 90-градусного фазового сдвига.ideal means. Using the invention, a standard of a 90 degree phase shift can be created.

Устройство содержит генератор 1,' трансформатор с первичной обмоткой 2, вторичной 3 обмоткой, коиденсатор\ 4, переменный резистор 5, резистор 6 нуль-индикатор 7, добавочную 8 обмотку, вспомогательный фазовращатель 9, регулятор 10 напряжения, усилитель 11 мощности и переключа|тель 12 с двумя переключающимися ^контактами.The device contains a generator 1, a transformer with primary winding 2, secondary 3 winding, co-capacitor \ 4, variable resistor 5, resistor 6 zero indicator 7, additional 8 winding, auxiliary phase shifter 9, voltage regulator 10, power amplifier 11 and switch | 12 with two switching ^ contacts.

Напряжение с генератора 1 через трансформатор с первичной обмоткой 2 поступает на вторичную 3 и добавочную 8 обмотки трансформатора, которые соединены с нуль-индикатором 7 и вспомогательным фазовращателем 9. Через регулятор 10 напряжения и усилитель 11 мощности напряжение подает* ся в одно из плеч моста, второе плечо образовано половиной вторичной 3 обмотки трансформатора, третье и четвертое плечи составляют конденсатор 4 с переменными резистором 5 и резистором 6. В одном из положений пере•ключателя 12 добиваются настройкой вспомогательного фазовращателя 9^ регулятора 10 напряжения, конденсатора 4 и переменного резистора 5, ··. чтобы нуль-индикатор 7 показал нуль. Переключают переключатель 12 и также, подстраивая переменные величины, добиваются нулевого показания нульиндикатора 7. Методом последовательных переключений и подстроек необходимо в обоих положениях переключателя 12 добиться нулевого показания нуль-индикатора 7. При таком положении напряжение на выходе усилителя 1! мощности находится в квадратуре с напряжением вторичной 3 обмотки трансформатора, а по величине равно половине ее напряжения.The voltage from the generator 1 through the transformer with the primary winding 2 is supplied to the secondary 3 and additional 8 windings of the transformer, which are connected to the zero indicator 7 and the auxiliary phase shifter 9. Through the voltage regulator 10 and power amplifier 11, the voltage is supplied to one of the bridge arms, the second arm is formed by half of the secondary 3 windings of the transformer, the third and fourth arms constitute a capacitor 4 with variable resistor 5 and resistor 6. In one of the positions of switch 12, they achieve the setting of auxiliary zovraschatelya 9 ^ regulator 10 voltage of the capacitor 4 and variable resistor 5, ··. so that the zero indicator 7 indicates zero. Switch 12 is switched and also, adjusting the variables, they achieve zero indication of the zero indicator 7. Using the method of successive switching and adjustments, it is necessary to achieve zero indication of zero indicator 7 in both positions of switch 12. At this position, the voltage at the output of amplifier 1! power is in quadrature with the voltage of the secondary 3 windings of the transformer, and the value is equal to half its voltage.

Как показала экспериментальная проверка, погрешность предлагаемого устройства по сравнению с известным на 1-2 порядка меньше, и имеются пути для ее дальнейшего уменьшения.As shown by experimental verification, the error of the proposed device compared with the known 1-2 orders of magnitude less, and there are ways to further reduce it.

Предлагаемое устройство обладает свойствами самоповерки и' не требует для своей аттестации каких-либо об·»"The proposed device has the properties of self-verification and 'does not require any certification for its certification”

Claims

This invention relates to a phase meter for the formation and determination of quadrature stresses. A device for determining the 90-degree phase shift is known, which comprises a phase shifter, a controlled amplifier and a null indicator 1. The disadvantage of such a device is a significant quadrature error. It is also known a device for determining the 90-degree phase shift, which contains a voltage divider, made in the form of a transformer with a secondary winding divided in half and connected to this winding by a series-connected capacitor and resistor f2j. A disadvantage of the known device is the relative low accuracy of 10.1-0.05 degrees. The purpose of the invention is to improve accuracy. The purpose of the invention is achieved by the fact that a device for determining a 90 degree phase shift, comprising a generator, a transformer, the primary winding of which is connected to the generator, and the secondary winding with a midpoint, a resistor and a capacitor, is provided with an additional winding of the transformer, a variable resistor, a zero-indicator, auxiliary phase shifter, voltage regulator, power amplifier and switch with two switchable contacts, with the additional winding of the transformer through serially connected Auxiliary phase shifter, voltage regulator and power amplifier are connected by one output to the middle point of the secondary winding of the transformer, and the other to the first normally closed and second normally open contact of the switch, the second terminals of which i are connected respectively to the terminals of the secondary winding of the transformer, and the pins of the moving contacts are connected to a series-connected capacitor, a variable resistor and a resistor, a zero indicator is connected to the middle point of the secondary winding of the transfo and a common point, such as a resistor and a variable resistor. The drawing shows a diagram of an apparatus for determining a 90 degree phase shift. The device contains a generator 1, a transformer with a primary winding 2, a secondary 3 winding, a capacitor 4, a variable resistor 5, a resistor 6 null indicator 7, an additional 8 winding, an auxiliary phase shifter 9, a voltage regulator 10, a power amplifier 11 and a switch 12 s two switching contacts. The voltage from the generator 1 through the transformer with the primary winding 2 is supplied to the secondary 3 and additional 8 windings of the transformer, which are connected to the zero-indicator 7 and the auxiliary phase shifter 9. Through the voltage regulator 10 and the power amplifier 11, the voltage delivers from one of the shoulders of the bridge, the second shoulder is formed by half of the secondary 3 windings of the transformer, the third and fourth shoulders comprise a capacitor with variable resistor 5 and resistor 6. In one of the positions of the switch 12, it is necessary to adjust the auxiliary The inverter 9 is a voltage regulator 10, a capacitor 4, and a variable resistor 5,. so that the null indicator 7 indicates zero. Switch 12 is switched on and also, by adjusting the variable values, zero indication of indicator 7 is obtained. Using successive switchings and adjustments, it is necessary to achieve zero indication of zero indicator 7 in both positions of switch 12. Under this position, the output voltage the power amplifier 1 is in quadrature with the voltage of the secondary 3 windings of the transformer, and is equal in magnitude to half of its voltage. As shown by experimental verification, the accuracy of the proposed device as compared with the known device is 1-2 times less, and there are ways to further reduce it. The proposed device possesses the properties of self-verification and does not require any sample means for its certification. Using the invention, a standard of 90-degree phase shift can be created. The invention The device for determining the 90-degree phase shift, containing a generator, a transformer, the primary winding of which is connected to the generator, the secondary - with a midpoint, a resistor and a capacitor, so that accuracy, it is equipped with an additional transformer winding, a variable resistor, a numerical indicator, an auxiliary phase shifter, a voltage regulator with a power amplifier and a switch with two switching contacts, and the additional winding through the auxiliary phase shifter connected in series, the voltage regulator and power amplifier are connected by one output, to the middle point of the secondary winding of the transformer, and the other to the first normally closed and second normally open contacts of the switch, the second terminals of which are connected respectively to the terminals of the secondary winding of the transformer, and the pins of the moving contacts are connected to a series-connected capacitor, a variable resistor and a resistor, a null indicator is attached the middle point of the secondary winding of the transformer and the common point of the resistor and the variable resistor compound. Sources of information taken into account in the examination 1. Vishenchuk IM, Kotyuk A.F., Shznk L.Ya. Electromechanical and electronic phase meters. M., Gosenergoizdat, 1962, p. 47

2. Galakhova OP, Koltik B.D., Kravchenko S.A. Basics of phase metering. L., Energie, 1976, p. 173.