SU1293662A1 - Device for indicating phase voltages of three-phase network - Google Patents

Abstract

The invention relates to the field of electrical measurements and can be used to indicate phase voltages in a three-phase network. The purpose of the invention, an increase in the accuracy of the indication, is achieved by shunting an indicator connected to the phase of a wire with no voltage. The device contains ventilating light indicators 1, 2 and 3, resistors 4, 8, 9 and 10, diodes 5, 6 and 7, and P, 12 and 13, clamps 14, 15 and 16 connected to loads 17, 18 and 19 connected by, for example, a triangle. LED indicators or indicator lamps — gas discharge or incandescence, connected in series with diodes, can be used as valve light indicators. I il. (/).

Description

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The invention relates to electrical measurements and can be used to indicate the presence or absence of phase voltages in a three-phase network.

The purpose of the invention is to improve the accuracy of the display by shunting an indicator connected to a phase wire on which there is no voltage.

The drawing shows an electrical schematic diagram of the device.

The display device phase voltage three-phase network contains the first 1, second 2 and third 3 valve light indicators, the cathodes of which through the first resistor 4 are connected to the cathodes of the first 5, second 6 and third 7 diodes, and the anode of each of the indicators 1, 2 and 3. connected to the first output, respectively, of the second 8, third 9 and fourth 10 resistors. The fourth 11, fifth 12 and sixth 13 diodes are connected in parallel with each of the indicators 1, 2 and 3, respectively. The anode of the first diode 5 is connected to the second terminal of the second resistor 8 and the first terminal 14. The anode of the second diode 6 is connected to the second terminal of the third resistor 9 and the second terminal 15. The anode of the third diode 7 is connected to the second terminal of the fourth resistor 10 and the third terminal 16. Clamps 14, 15 and 16 subkey to loads 17, 18, and 19, connected, for example, by a triangle, on which the presence or absence of voltage is controlled. LEDs or indicator lamps (gas discharge or incandescence) connected in series with diodes can be used as valve light indicators.

The display device phase voltage works as follows.

In the presence of phase voltages between any two terminals 14, 15 and 16, the first half-wave of the alternating current period of any phase, for example, i connected to the clamp 14, flows through a resistor 8, a valve light indicator 1, a diode 12 and a resistor 9, and also a diode 13 and a resistor 10. The second half-wave of the current of the same half-period of the same phase flows through the resistor 10 and the valve light indicator 3, as well as through the resistor 9 and the valve light indicator 2, further through the diode 11 and resistor 8.

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In the same way, the half-wave currents of any other phase connected to terminal 15 or 16 flow. In the presence of phase voltages between all terminals 14, 15 and 16, all indicators 1, 2 and 3 are illuminated.

In the absence of voltage, for example, at clamp 14 relative to clamps 15 and 16 and the positive polarity of the half-wave of alternating voltage at lock 15 with respect to clamp 16, the voltage at clamp 14 with respect to clamp 16 has the same sign as at clamp 15, and equal to half of it, since the voltage between terminals 15 and 16 is shared by loads 17 and 19. In this case, the current from terminal I5 flows through the following elements: resistor 9 - indicator light 2 - diode 13 - resistor 10; diode 6 - resistor 4, then through diode P and resistor 8, as well as through diode 13 and resistor 10. Thus, the current through the indicator light 1 did not flow and the indicator light I connected to terminal 14, which does not have a phase voltage life does not shine. By changing the polarity of the half-wave of alternating voltage between the terminals 15 and 16, it can be shown that the current through the light indicator 1 does not flow, and through the light 3 it flows. Consequently, when the phase voltage at the terminal 14 disappears, the LEDs connected to the two remaining terminals through the resistors, and the indicator 1 connected through the resistor 8 to the terminal 14, do not light up, since diode 6 and 7 are alternately connected by series with resistor 4.

Consequently, the differences in the display device of the phase voltages of the three-phase network ensure the accuracy of the indication when the loads are connected to the phase wires.

Claims (1)

Invention Formula A device for indicating the phase voltages of a three-phase network, containing the first, second and third valve light indicators, each of which is connected to the first, second and third diodes, the first, second and third diodes, to the first through the first, second and third resistors respectively. of which jedi 1293662 It is not connected to the first terminal with one of the veins connected to the combined second wipe light indicators, about the leads of the light valve indicators and 10 so that, sr, is opposite in relation to the indicator, the accuracy of the indication, tori, to each of of which the first, second and third diodes, the fifth, the sixth diodes and the fourth diodes are additionally introduced, respectively, are connected counter-parallelly, a resistor, with the first one being the same, and the second conclusions of the fourth, nth and The terminals of the fourth, fifth, and neck-sixth diodes are connected to the corresponding diodes. Through the fourth resistor, but to the first, second, and third terminals.