SU822049A1

SU822049A1 - Current sensor

Info

Publication number: SU822049A1
Application number: SU792792816A
Authority: SU
Inventors: Дмитрий Дмитриевич Пилипко; Юрий Иванович Косинский
Original assignee: Киевский Ордена Ленина Государствен-Ный Университет Им.T.Г.Шевченко
Priority date: 1979-07-09
Filing date: 1979-07-09
Publication date: 1981-04-15

Description

1one

Изобретение относитс к электроизмерительной технике и предназначено дл использовани при необходимости реализации бесконтактного измерени больших токов.The invention relates to electrical measuring equipment and is intended for use when it is necessary to implement non-contact measurement of high currents.

Известен датчик тока, содержащий разомкнутый магнитопровод в виде двух половин, св занных между собой через шарнир, а также сосуд, расположенный Между торцами магнитопровода и заполненный жидкостью l.A current sensor is known that contains an open magnetic circuit in the form of two halves interconnected through a hinge, as well as a vessel located between the ends of the magnetic conductor and filled with liquid l.

Недостатки данного устройства низка точность измерени и небольшо диапазон измер емых токов из-за нелинейных свойств магнитной проницаемости магнитопровода и неравномерности-- намагничивани по периметру. Кроме того, устройство имеет большой вес и существенные габариты.The disadvantages of this device are low measurement accuracy and a small range of measurable currents due to the nonlinear properties of the magnetic permeability of the magnetic circuit and the non-uniformity of magnetization around the perimeter. In addition, the device has a large weight and substantial dimensions.

Наиболее близким к предлагаемому вл етс датчик тока ферродинамического типа, содержащий сосуд, заполненный жидкостью или газом, и к тушку , подлкючённую к источнику эталонного тока 2.Closest to the present invention is a ferrodynamic type current sensor comprising a vessel filled with liquid or gas and to a carcass connected to the reference current source 2.

Недостаток такого устройства заключаетс в значительной сложности его конструкции, обусловленной трул кост ми практической реализаций передачи сигнала информации от реагирующего органа, в качестве которого использована рамка с измер емым током , к сосуду.The disadvantage of such a device lies in the considerable complexity of its design, due to the practical implementation of the transmission of the information signal from the reacting authority, which is a frame with measured current, to the vessel.

Цель изобретени - упрощение по-. добного измерительного устройства.The purpose of the invention is to simplify. similar measuring device.

Поставленна цель достигаетс тем, что в датчике тока, содержадем сосуд, заполненный жидкостью или газом, и катушку, подк.гаоченную к источнику The goal is achieved by the fact that the current sensor contains a vessel filled with a liquid or gas and a coil that is connected to the source.

0 эталонного тока, сосуд вьтолнен в виде трубки из эластичногхэ материгша, охватывающей проводник с измер емым током, а катушка расположена на внешней поверхности трубки.0 of the reference current, the vessel is made in the form of a tube made of an elastic motherboard covering the conductor with the measured current, and the coil is located on the outer surface of the tube.

На фиг. 1 схематически представ5 лен предложенный датчик тока, общий вид; на фиг. 2 - поперечные разрезы дл двух его конкретных исполнений.FIG. 1 schematically shows the proposed current sensor, general view; in fig. 2 shows transverse sections for two specific embodiments thereof.

Вокруг проводника 1 с измер елым Around conductor 1 with measuring

0 током «, размещен сосуд 2, выполненный в виде трубки из эластичного материала и заполненный жидкостью или газом. На сосуд 2 нанесена катушка 3 с эталонным током ..Ig . С сосудом 2 через линию 4 св зи соединен приемный блок 5.0 current “, placed the vessel 2, made in the form of a tube of elastic material and filled with liquid or gas. A coil 3 with a reference current is applied to vessel 2 ..Ig. The receiving unit 5 is connected to the vessel 2 via a communication line 4.

Датчик тока работает следующимCurrent sensor works as follows

Claims

O way. The current G, which flows into conductor 1, creates around it a field with intensity if-k, where в is the distance from the center of conductor 1. When a reference current 1o is passed through the coil, each element d of coil 3 acts where 4710 g / m; R is the distance from the center of the conductor 1 s to the elec- trode of the coil 3 s I о. The force ciY is perpendicular to H and to the current direction 1d according to the rule of the left hand. The pressure P generated in the iron or gas filling the internal volume of vessel 2 corresponds to where n is the number of turns of the coil 5 is the surface area of the vessel. yes .2. When winding a coil 3 coil to coil, the above formula takes the form IP 1 h 47gk. Where. d is the diameter of the coil conductor The magnitude of the current C is determined by the following relationship: 4 Ttar The pressure P is transmitted via the communication line 4 to a receiving unit which may be, for example, m meter. In view of the fact that the walls of the vessel 2 possess some rigidity, they average the action of forces from the neighboring turns in the coil 3 on the space between them. Therefore, by measuring the pressure P, one can thereby measure the total integras over a closed loop that encloses the conductor 1 with the measured current. This achieves increased measurement accuracy, since it is known that i HdE. The sensitivity of the sensor can be increased by increasing the number of turns or increasing the value of the reference current. Expansion of the measurement range is achieved by expanding the range of changes in the reference current. It should be noted that since “i-x, the accuracy is determined by The magnitude of the reference current IQ is quite high. It is also significant that the accuracy of current measurement 1 increases with an increase in the absolute value of this current with constant g and the same accuracy of determining pressure P. Invention Formula A current sensor comprising a vessel filled with liquid or gas and a coil connected to a reference source current, characterized in that, for the sake of simplicity, the vessel in it is made in the form of a tube of elastic material, covering the conductor with the measured current, and the coil is located on the outer surface of the tube. Sources of information taken into account during the examination 1. USSR author's certificate No. 434319, cl. G 01 R 19/00, 1972.

2. Eugenbrot, V.M. Transducers of a series of energy signals in automatic control systems. M., Energie, 1970, pp. 22-26.