RU1815632C - Ferroresonant stabilizer of direct voltage - Google Patents

Abstract

Usage: in stabilized secondary power sources. Summary of the invention: the stabilizer contains a saturated three-phase transformer 1 with windings connected according to a delta-star circuit, capacitors 2 connected between the three-phase network and transformer 1, and a three-phase rectifier 3. The inclusion of the primary windings of the transformer 1 according to the triangle allows to expand the range of stabilization tion in the device. 1 ill.

Description

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The invention relates to electrical engineering, to ferroresonant devices and can be used as a stabilized source of secondary power supply.

An object of the invention is to expand the stabilization range of the output voltage.

The drawing shows a schematic diagram of the proposed stabilizer.

The device contains a saturated three phase inductive element 1, capacitors 2, a three phase rectifier 3, and a load 4.

The expansion of the stabilization range in the proposed device is explained on the basis of the condition of the same position of the operating point, providing a normal voltage stabilization mode, on the current-voltage characteristic (v.a.x) of the inductive element 1, when its primary windings are connected to a star or a triangle. This means that the phase voltages and currents of the inductive element 1 in both cases must be the same, which can be written as follows:

U D U U D U U Y U U; (1)

Y l: (2)

 For 3-I Df V3 I Y f 3 i y l:

where U dl; U Df; I for; I Df - respectively, linear and phase voltages and currents with a triangle:

yul. MufMul UV respectively linear and phase voltages and currents at arrival.

After dividing (1) by (2) we get:

IDL TSUL / V3 U Ul | DL 3 Chul

or what is the same

7 -2 unit

For - s.

where 2n is the total resistance of the line in which the capacitors 2 are connected, between the input terminals of the stabilizer and the output

the primary windings of the inductive element 1.

Thus, to maintain a constant position of the operating point on the VAA

inductive element 1, when connecting its primary windings into a triangle, it is necessary to reduce the value of 2n by 3 times, which is achieved by a corresponding increase in the capacitance of capacitors 2 also by 3 times. Since the total resistance of the three-phase ferroresonance circuit formed by the primary windings of the inductive element 1 and capacitors 2 in this

decreases, then the level of power stored in this circuit increases accordingly, the excitation voltage of autoparametric oscillations (AIC), which provide voltage stabilization, decreases, and the range of voltage stabilization expands.

The stabilizer works as follows.

In the input circuit of the stabilizer (i.e., in

three-phase ferroresonant circuit) the AICs are excited at the frequency of the power source, while the voltage across the windings of the inductive element 1 is stabilized over a wide range of voltage variations of the power source and load resistance 4, as a result of which the output voltage of the stabilizer is also stabilized. The external characteristic of the stabilizer is determined only by the external

characteristic of three phase rectifier 3.

Claims (1)

The claims Ferroresonant DC voltage stabilizer containing a saturated three-phase inductive element and three capacitors, the first conclusions of which are connected to the corresponding input terminals, characterized in that, in order to expand the stabilization range, the saturated three-phase inductive element is made in the form of a transformer, the primary windings of which are connected in a triangle moreover, the second terminals of the capacitors are connected to the corresponding primary windings of the specified transformer, the secondary windings of which are black Without the introduced three-phase rectifier, they are connected to the output terminals.