SU744346A1 - Measuring direct-current transformer - Google Patents

Description

one

The invention relates to the field of measurement technology and is intended for systems for the automatic control of current by thyristor converters, mainly for electromotive composition.

DC current transducers are known for converter plants with notional separation of a power circuit from control circuits, comprising a direct current transformer (TFT) with an alternating voltage source, a rectifier and a load resistor, 1.

However, due to the large current ripple, such measuring transducers are not used for automatic control systems. The reduction of pulsations by including passive filter capacitors and inductors in the load leads to a deterioration in the dynamic properties of the automatic control system. In addition, in order to obtain in the ethnkh devices a satisfactory accuracy (linearity) in the measured range of currents, a large multiplicity of the threading pattern is required, and consequently, a greater installed power supply.

The purpose of the present invention is to improve the accuracy and speed of setTBa.

The goal is achieved by the fact that the measuring converter of direct current contains and 11 transformers of direct current, the excitation winding of which through the diagonal of alternating current of two-flux rectifier bridge and iodk; It is clear that the voltage source is not populated, and the load voltage consists of parallel-connected resistors and co-detector, the output of the KOTOpoii is connected to the outputs of the connection terminal. A current of a two-floor periodically 0 rectifier of the th bridge, equipped with a voltage indicator for supply voltage, the input of which is connected to the AC current, the inverter

rectangular 1PULS WITH a CURRENT MANUAL key connected between the second output of the load chain and the second output of the other side

current DV) X YOU 1 PERIOD 0 YOU 1 TIME,

bridge, and unravlonp current iodk; Oche 1a to the output of the forms 1vaty, 1I pulses, the input is KOTORO 0 10DLYKUCHSN to

 1kd 1katora 13.1yen polarity 11 1tayup, his iaiir gein. FIG. 1 shows a schematic of an 11 current U1 current converter; pa fpg. 2 prppede py diagram currents paprzhepnn, on with and yuschpe prpptspp his work. I 1p11pfo)}, i1tor 1 iiU.TOHinikiiо current (TFT) with winding 2 control and 3 3 4 windings connected to the spikes ui; Tympo persempso paprzhepp 5 through the rectifier bridge 6 6. H; i output i-; bui | iHmpt G included resistive) 7, parallel 1 () to which iodk oche kopdepSator 8 through |) without a current key 9. The output load of the device is represented in the form of a resistor 10. The control input of the current key 9 is connected through the shape of the signal 11 pulses and ppdpkator measuring device. lnosti nptayuN1. its nanrzhepp 12 to spikes 5 sources of interleaved and replenished. In the diagrams of FIG. 2 denotes: L / 5, ii - mgioid ziacheip units) caps and currents of the elements of exams 5, 7 .... respectively fl fl, landmark; a -, - -current in the primary of the transformer 2 of the carrier current, reduced to the operating current of the winding, where tr is the coefficient of transformation of TNT; 1 period of nutrition, its voltage; duration of imp. control key current switch 9; A is the moment I measured the supply of nanrheasin. The principle of operation of the device is to use one of the properties of a transformer of direct current, concluding; sms, that the unproductive voltage and after changing the soloated battery current of the pa6o4eii winding is close to the reduced current of the nervous winding E, and the magnitude and magnitude of the winding is equal to the current of the nervous winding E. transformer, which is irremeable, the component of piduccin in the cores of the transformer is constantly 0 current. At the moment of setting the field of the terminal, P1, its partner, the input of the current key 9 is fed to the control center, with the speed of MCHbHieii for,; Aerpodg paprzhepp ptapn. During the time of action of an impulse, the TU capacitor 8 is charged with an exciter to a pair of resistors 7 proportional to the measured current: U,: -: i, R, li, R, - U, (0) where) is the initial The capacitor voltage is 8 prp / 0 0. It follows from the latter that, if Us, then Us -i - Ri. For example, pritu / tce,., 993iV /. When the current switch is turned off; 11Ch, the capacitor is discharged on the load resistor 10. 1: sln, THAT is an unusually thinner than the maximum voltage indicator. For example, CsRio T, etc., and the La support all%. At the beginning of the next i-period, the codex 8 charge dp1s to papr x1..pp. noportsioya.plugo measurable tochu, apalo pchpo, previous in,;: uner 1odo. 1 akmp way, and 1 output uter05- etva mozhpo P (), 1uch11 bes1 opeppo small coefficient of the pulseation i1przhenn. The delay time of the current immersion transducer is a one way nolperwire and iairgey. Reading that the measurement measures the inductance of the dissipation of the transformer windings and current, as well as the pattern of the magnetization of the core of the DC transformer, will probably increase the number of windings of the transformer in the current transformer, and the amount of voltage applied to the transformer will be applied. Papr Zhepp and increase the frequency of the last. Due to this, a small power transformer with a low power consumption is obtained. In addition to the fact that the result of measurements corresponds to the moment of the irohodeiya of the supply of zero through zero, the accuracy of the measurement of the practical PCPs does not depend on the shape and fluctuation of the supply voltage. M a l a p 3 O r ete n p An impurity DC-DC converter containing a direct current transformer, the excitation winding of which is connected through the diagonal of an alternating current of a two-wave rectifier bridge connected to the current-voltage current source and the load value of of parallel parallel resistor and capacitor, one output of which is connected to; one to one of the outputs of the diagonal of the current of the two-half-round rectifier bridge, which, with increasing accuracy, quickly dyatviruet the bridge, and the current key and key switch to the pulse former, whose input and key to the output of the polarizer change the voltage. Nostoichiki of information, which are given in attendees at the examination 1. MS Belitska, et al. Transformers for high-current and high-voltage circuits. M.-L., “Enery, 1964, p. 50-51.

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Claims (1)

Claim Measuring transducer and constant; current containing a DC transformer, the excitation winding of which through the diagonal of the alternating current of the half-wave rectifier bridge is connected to the buses of the alternating current source, and a load circuit consisting of a parallel-connected resistor and capacitor, one terminal of which is connected to one of the terminals of the direct current diagonal of the half-wave rectifier bridge, due to the fact that, in order to increase accuracy and speed, it is equipped with an indicator of the change in the polarity of the supply voltage, the input of which is connected to the buses of the alternating current source, a pulse shaper and a current controlled switch connected between the second terminal of the load chain and the second terminal of the DC diagonal of a half-wave rectifier bridge, the current switch control circuit being connected to the output of the pulse shaper, the input of which is connected to the output indicator of the change in the polarity of the supply voltage. And so on and to and and for rmac and and taken into account during the examination 1. Belitskaya M. S. et al. DC transformers for high voltage converting installations. M.-L., "Energy", 1964, p. 50-51. Fig. /