SU1506367A1 - Device for contact-free current measurement - Google Patents

Abstract

The invention can be used in instruments for measuring current in underground or underwater pipelines (linear conductors). The purpose of the invention is to improve the measurement accuracy and expand the functionality of the device. Two sensors 1 and 2 rigidly connected to each other are made in the form of two-component systems, mutually orthogonal to the combined centers of identical frames (P) 4 and 5. The planes P 4 and 5 are perpendicular to the rod (W) 3, at the ends of which are sensors 1 and 2. Pins P 4 and 5 are connected via switch 6 to the input of the selective amplifier 7. Pivoting W 3 around the center P 4 and 5 of sensor 1 continues until the reading of the measuring device 9 becomes maximum. In this case, W 3 is located in the direction perpendicular to the pipeline. Thus, the voltage of its gasket is determined. By moving the W 3 in height, the readings of the measuring device 9 from P 4 and 5 of the sensor 2 are equalized. This allows the center of sensor 1 to be positioned exactly above the center of the pipeline. In the W 3 position, when the centers of the sensors 1 and 2 and the center of the pipeline are located at the vertices of an equilateral triangle, the vertical P 5 of the sensor 1 is connected to the input of the amplifier. The indications of the measuring device 9 are proportional to the current in the pipeline. 1 il.

Description

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3150

The invention relates to the field of electrical measurements and can be used in instruments for measuring current in linear conductors, as well as in

underground or submarine mag- netic pipelines, for example, when assessing the state of their insulating coating.

The purpose of the invention is to increase the viscosity and enhance the functionality by providing control of the position of the sensor of the measured current.

The drawing shows a block diagram of a device for contactless current measurement,

The device contains the first 1 and second 2 magnetically sensitive sensors located at the ends of the horizontal rod 3. Each sensor is made in the form of two frames 4 and 5 having a center. The first frame 4 is located in the plane, perpendicular to the rod 3, so that the normal plane of the frame 4 is directed horizontally along the rod 3, the second frame 5 is located in the horizontal section and its normal is directed vertically, perpendicular to the rod 3, Conclusions of the frames 4 and 5 sensors 1 and 2 through the switch 6 are connected to the input of the amplifier 7, the output of which is connected through the amplitude detector 8 to the measuring device 9. Between the output of the switch 6 and the input of the selective amplifier 7, an attenuator 10 can be turned on. to be also equipped with a tripod with a mechanism that provides vertical movement of the rod 3,

The device for contactless current measurement operates as follows.

A horizontal frame 5 of one of the sensors, for example sensor 1, is connected to the input of the selective amplifier 7 by a switch 6 and the rod with the sensor is moved above the pipeline to the nop until measuring device 9 shows a zero signal. In this case, the horizontal frame 5 of the sensor 1 is located above the pipeline,

Then, the head 1 of 3 is turned around the center of the frames 4 and 5 of sensor 1, and the input of the amplifier 7 is connected vertically to the frame of the frame 4 by the sensor

1, recording rc; Ri: the magnetic component of the magnetic field of the current. The rotation of the rod 3 is carried out until the reading of the measuring device 9 becomes maximum. In this case, the rod 3 is located in the direction perpendicular to the pipeline.

In this way, the direction of the pipeline is determined. Then switch 6 to the input of the amplifier 7 alternately connect the frames 4 and 5 of the sensor 2, and the rod 3 is moved in height until the readings of the measuring device 9 from the frames 4 and 5 of the sensor 2 become equal,

In this case, the centers of the frames of sensors 1 and 2 and the center of the pipeline in the plane of the rod 3 are located at the vertices of a rectangular isosceles triangle, with the center of sensor 1 located at the apex of the right angle. , perpendicular to the axis of the pipeline, passes through the sharp minimum between two max. volumes, therefore, the current of the horizontal frame 4 of sensor 1, measured by the device 9, also passes through the sharp minimum, which allows Position the center of sensor 1 exactly above the center of the pipeline. The horizontal component of the magnetic field at the same point has a smooth maximum, for this reason, a small displacement of the center of the sensor 1 when moving the rod 3 does not impair the measurement accuracy,

In the position of the rod 3, in which the centers of the sensors 1 and 2 and the center of the pipeline are located at the vertices of an isosceles right triangle, the frame 4 of the sensor 1 is connected to the input of the amplifier 7, The indications of Device 9 are proportional to the current in the pipeline. Attenuator 10 is used to calibrate the device.

Claims (1)

The invention The device for contactless current measurement, containing the first and second magnetically sensitive sensors located at the ends of the horizontal rod and made in the form of frames, the normal to the plane of the frame of the first sensor horizontal, selective amplifier, the output of which is switched through the amplitude detector 515063676 to the measuring device, about tl and -y are additional frames, normals Of course, for the purpose of which the planes are perpendicular The accuracy and expansion of the rod, the centers of the frames of the sensors with combined functionality, are normal, and the conclusions of each frame through the frame of the second sensor are fully inserted switch laid horizontally, first connected to the entrance of the electoral The second sensors additionally enter the amplifier.