SU1663564A1 - Dc electricity meter - Google Patents

Abstract

The invention relates to the measurement of electricity and can be used to control the consumption of electricity by rolling stock of railway or other transport in direct current electric current and in other circuits powered by direct current. The purpose of the invention is to improve the accuracy of measuring electricity in direct current circuits. The goal is achieved by introducing an amplitude limiter 10, a unit 13 controlled by a voltage of a resistor, performing generator 5 sinusoidal and forming new connections. The newly introduced blocks and connections allow the windings of the ac induction meter 9 to be supplied with a sinusoidal current, which reduces the error in its counting. The meter also contains a source of direct current 1, a resistive voltage divider 2, consisting of resistors 3 and 4, a transformer 6 with two secondary windings 7, 8, a diode bridge 11, a load 12, a resistive current sensor 14. 1 il.

Description

The invention relates to the field of measuring DC electric power and can be used to control the electric power consumption of rolling stock of railway or other transport in direct current electric current and other DC-powered circuits. The purpose of the invention is to improve the accuracy of measuring electricity in direct current circuits.

The drawing shows a block diagram of a DC electricity meter.

The device contains a source of direct current 1, a resistive divider voltage 2, consisting of resistors 3 and 4, a generator 5, a transformer 6 with two secondary windings 7 and 8, an induction counter 9 AC, an amplitude limiter 10, a diode bridge 11, the load 12, block 13 of a voltage controlled resistor, resistive current sensor 14.

The terminals of the DC source 1 are connected to the terminals of the resistive voltage divider 2, the output of which is connected to the control input of the generator 5 connected to the terminals of the primary winding of the transformer 6, and one of the terminals of the generator 5 is connected to the first output of the DC source 1. The terminals of the first secondary winding 7 of the transformer 6 are connected to the terminals of the voltage winding of the induction counter 9 of the alternating current, the first terminal of the current winding of which is connected to the first output of the amplitude limiter 10 connected by the inputs of the second secondary winding of the transformer 6. the resistor through the first diagonal of the diode bridge 11 is connected to the second output of the block 13 of the voltage controlled resistor and the first terminals of the DC source 1 and the resistive sensor 14 and current. The second terminal of the amplitude limiter 10 is connected via the second diode of the diode bridge 11 to the second terminal of the current winding of the induction counter 9 of the alternating current. The second output of the direct current source 1 through the load 12 is connected to the control input of the unit 13 of the voltage controlled resistor and the second output of the resistive current sensor 14.

The principle of operation of a DC electricity meter is as follows.

After switching on the direct current source 1 in the generator 5, fed through resistor divider 2 on resistors 3 and 4, harmonic electric oscillations are excited. The amplitude of the output voltage applied to the voltage winding of the AC induction counter 9 is proportional to the voltage on the source terminals constant current.

An alternating current flows through the current winding of the induction counter 9, the amplitude of which depends on the resistance

between the collector and the emitter of the transistor, which is part of the block 13, controlled by the voltage of the resistor.

During both half periods of alternating voltage the potential of the collector

higher emitter potential. The load current forms on the resistor current sensor 14 a voltage drop, under the action of which the specified transistor is opened and the alternating current of the current winding is regulated. Consequently, the rotational speed of the disc of the induction counter 9 of the alternating current is proportional to the power of the direct current released in the load 2.

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Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A DC power meter comprising a resistive voltage divider, a generator, a transformer, a resistive current sensor, an inductive AC meter, and a diode bridge, the terminals of the resistive voltage divider connected to the DC terminals whose first the output of the resistive current sensor, the outputs of the first secondary winding of the transformer are connected to the terminals of the voltage winding of the induction counter of alternating current, characterized in that In order to improve accuracy, the generator is sinusoidal, and an amplitude limiter and a voltage controlled resistor unit are inserted into the electricity-DC meter. the voltage of the resistor, the control input of which is connected to the second output of the resistive current sensor and the first output of the load, the second output of which is connected to the second output of the direct current source, the output of the resistive voltage divider is connected to the control input of the generator, the outputs of which are connected to the terminals of the transformer primary winding 5x16635646 to the inputs of the amplitude limiter, the first AC meter is connected to the output of which through the second diagonal by the second output of the amplitude limiter of one bridge and the current winding induction-l.