SU97818A1 - An electrical device for producing voltage proportional to the power of an alternating current in an electrical circuit - Google Patents

Description

The invention relates to devices for producing a voltage proportional to the power of an alternating current in an electrical circuit.

The known devices of this kind have a low power output or have a great fault and instability.

The described device differs from the known ones in order to ensure the stability of the conversion characteristics and to obtain higher output power, it uses nonlinear chokes and transformers with a saturated magnetic core included in the circuit to create a quadratic relationship between the primary current and the output voltage.

The drawing shows a schematic diagram of the proposed device.

Current transformer 1 and voltage transformer 2 are fed by summing transformers 3 vi 4. The magnetic fluxes in the cores of these transformers are respectively proportional to the measured current and voltage.

F, RI, and F; d1, where p and q are the coefficients of proportionality.

In the magnetic core of the transformer 3 a geometrical sum of the magnetic fluxes Ф „and Ф, - is formed, and in the magnetic core of the transformer - their geometric difference. . .-. ; ;; B; the secondary circuit of the voltage transformer J includes active resistors 5 and a capacitor 6.

Transformer 3 has three secondary windings 7, 8 and 9. Transformat.r-ator 4 also has three secondary windings 10, No 12. In the winding circuit 7 of the transformer 5 B1cg, saturation throttle 13 and in series with it resistance 14 are connected.

D-create proportionality between the voltage on the secondary winding 7 and the current I in its circuit parallel to the winding 7 on-a. No. 97818

tive resistance- / d. The current 1 in the circuit of the winding 7 is rectified by a rectifier 16, at the output of which a potentiometer 17 is installed.

A nonlinear transformer 19 is connected to the secondary winding 8 of the transformer 3 through active resistance 18. The secondary winding of this transformer is connected via rectifier 21 through active resistance 20, the output of which has a potentiometer 22.

The winding circuit 9 of transformer 3 includes active resistance 23 and rectifier 24 with potentiometer 25 at its output.

The winding 10 of the transformer 4 is shunted by a resistor 25 and a saturation throttle 27, a resistor 28 and a rectifier 29 with a potentiometer 30 at its output are included in its circuit.

The winding circuit 11 is connected through active resistance 31 to a saturated transformer 32. The secondary winding of this transformer through active resistance 33 is connected to a rectifier 34, at the output of which a potentiometer 35 is installed.

The coil circuit 12 of transformer 4 includes active resistance 36 and rectifier 37, the output of which has a potentiometer 38.

All potentiometers 17, 22, 25, 30, 35 and 38 are connected in series and a ballast resistance 39 is installed at their output, which is connected to the telemeter 41 via communication line 40.

The characteristics of winding circuits 7, S and 9 are selected so that the voltages taken from potentiometers / 7, 22 and 25 are defined by the formulas:

For potentiometer 17:

f / i-cti (a14-a2F1 -: - azFg) For potentiometer 22:

., (a4 - (- a, F1-aiF1-) for potentiometer 25:

where QI, ar, "3 - coefficients determined by the position

engine potentiometers 17, 22 and 25,

φ 02 - magnetic points, in the cores of transformers 3 and 4, ai, uz, QZ, ı, as, Qe, 0.7-coefficients determined by the characteristics of the circuits of the transformer windings 3. The total voltage of the three potentiometers 17, 22 and 25 will be

Hz-1 / 1-62- 3 (aiai-a20 +) + (a1-2- "2" 5-azI7) i + (gvz + "jae) 0i. To obtain a quadratic dependence, it is necessary that:

 -

, a5 - "," 5 0, i.e., to 6 / o (aia3-azie),

This is achieved by moving the potentiometers to the position “2” 1, (a - - “o). Square square; for the second half the same. QxeMW is obtained