SU427404A1 - MEASURING TRANSFORMER OF DC VOLTAGE P T BFOND ZIWERT - Google Patents

Description

The proposed invention relates to devices for measuring transducers of direct current and can be used in measuring and information technology.

A direct current measuring transformer consisting of a copper cable with a modular cutout, two saturation throttles with a parallel connected condenser, a two-loop voltage-level detector with a resistance and a measuring device is known.

A disadvantage of the known measuring transformer of direct current is that, due to the inability to adjust the sensitivity over a wide range, the constancy of the accuracy class of P1 for all possible values of direct current and relative narrowness of the range of magnitudes is not provided.

The purpose of the invention is to provide a smooth adjustment of the sensitivity over a wide range and to extend the range of measured DC magnitudes.

Y |; aza H1a goal is achieved due to the fact that the measuring winding, transformerally connected to the single-turn winding of the NOSTOYNNY current, is made moving in the cavity along two cylindrical cores 11p with respect to each other of the cylindrical core and covered with 1) 10- perpendy. the ammunition field of alternating current is located.

The drawing shows a measuring transformer of direct current, consisting of a ferromagnetic magnetic conductor / c distributed by parameters according to the power wave, made in the form of two concentrically located equal cross-section cores, an excitation winding 2, covering both cardiac (magnet scale /, single-turn winding of direct current 3 and movable part of the measuring winding 4 on the internal one (dech (1ike, with measuring () 6% of the other 4 can move IB. cavities between two cylindrical corempropro ode 1.

Measuring transform Iop current; i); i6ot is as follows. The excitation winding 2 is connected to the n-pinch point (of the standard cell and creates a null-ionic magnetic field in the core of the magnetic core /, which causes a nirnoidal change in the differential magnetic permeability of the cores, and the winding V is connected through the induction hanger head and it is attached to the hub. , in accordance with the setting of the constant mode of MaiHMnidr, a field whose notes change with a frequency equal to the frequency of the difference | () 1f1N11 a.1ni | 1

magnetic permeability, i.e., doubled compared with the excitation winding current. The variation of this flux induces in the measuring winding 4, transformer wired with the DC winding 3, the variable e. d. doubled frequency, the magnitude of which is proportional to the intensity of the one-hundredth field and, consequently, the magnitude of the measured | constant current. Thus, the current measured by the ammeter is twice the hour. The currents in the closed circuit of the measuring winding through the resistance at a certain scale correspond to the magnitude of the measured direct current. Moving the measuring winding to the extreme right position with the coordinate Xtah expands the range of the measured direct current to the maximum value (minimum sensitivity) determined only by the allowable current density in the single turn winding of the direct current and moving it to the extreme left position with the coordinate JL O provides maximum sensitivity with the intention of relatively small direct currents.

Subject invention

A direct current measuring transformer containing a magnetic core, an immersion winding, an excitation winding and a direct current winding, characterized in that, in order to smoothly adjust the amplitude sensitivity over a wide range and expand the limits of the measured direct current values, the measuring winding is adapted to displacements in the cavity along the two magnetized lindrical cores located relative to each other by them and placed inside the excitation winding eye that is perpendicular to the magnetic cores.

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