SU1718131A1 - Indicator of the presence of three-phase voltage - Google Patents

Description

The invention relates to electrical measuring technology and can be used to indicate the presence of voltages of a three-phase AC network with a neutral wire.

The purpose of the invention is to increase the reliability of the display by improving the operator’s perception of information about the absence of phase voltages.

The drawing shows a diagram of the indicator.

The indicator contains the first, second and third diodes 1-3, the first terminals of which are connected respectively to the first, second and third phase inputs 4-6 of the device, and the second terminals to the first terminals of the first, second and third light-emitting elements 7-9, respectively, the second the pins of which are combined, as well as the current limiting element 1d; for example, on the resistor 11, which is connected to the zero input 12 of the device. The fourth, fifth and sixth light-emitting elements 13-15 are connected in series or in parallel between the common connection point of elements 7-9 and the free output of element 10. The radiation color of elements 13-15, for example red, is chosen different from the color of radiation, for example green, elements 7-9, which are made emitting to common optical fibers (optical outputs) 1 6-Ш, respectively, with elements. As elements 7-9 and 13-15, LEDs can be used.

The indicator works as follows.

When the device is connected to a three-phase network, dyads 1-3 and also LEDs 7-9 pass current pulses during approximately one third of the period. The same pulses are transmitted through the LEDs 13-15 and resistor 11. In this case, the LEDs 7-9 are light green with green light and the LEDs 13-15 light with red light. As a result, the light bulbs 16-18 light are amber, indicating that all three phases of the network are present at the device inputs.

In the absence of one of the phase voltages, for example, phase A by 4, the current through diode 1 and the LED 7 decreases significantly or becomes equal to zero.

while the current through the LED 13 continues to flow under the influence of the phase voltages B and C. As a result, the color of the light guide 16 changes to red

or orange, which indicates the absence of voltage of phase A. At the same time, the color of the optical fibers 17 and 18 does not change, since the currents through the LEDs 8.14 and 9.15 change only slightly.

In the absence of two phase voltages, such as A and B, the optical fibers 16 and 17 are red and the optical fiber is 18 amber.

Current limiting element 10 may contain a zener diode connected in series with a resistor if the nature of the load does not provide for a sharp decrease in the voltage at the input of the device during the disappearance of the mains phase.

Thus, when the phase of the network disappears, the light color of the fiber changes to the conventional emergency (red, orange), which significantly increases the reliability of the indication by improving

perception of emergency information by the operator.

Ph o rm a l and z o b r e u n A three-phase voltage presence indicator containing the first, second, and third diodes, the first terminals of which are connected to the first, second, and third phase inputs of the device, respectively, and the second terminals to the first terminals of the first, second, and third light-emitting elements of the same luminescence color, the second terminals of which are combined and connected via a current limiting element to the zero input of the device, characterized by that. that, in order to increase the reliability of the display, the fourth, fifth and sixth light-emitting elements of a different color of luminescence, which are connected to the disconnection of the combined second terminals of the first, second and third light-emitting elements and the current limiting element, are inserted in series or parallel to it the optical outputs of the first and

the fourth, second and fifth, third and sixth light-emitting elements, respectively, are combined,

Claims (1)

Claim An indicator of the presence of a three-phase voltage, containing the first, second and third diodes, the first conclusions of which are connected respectively to the first, second and third phase inputs of the device, and the second conclusions are to the first conclusions of the first, second and third light-emitting elements of the same glow color, the second conclusions of which are combined and through the current limiting element connected to the zero input of the device, characterized in that. that, in order to increase the reliability of the indication, the fourth, fifth and sixth light-emitting elements of a different glow color are introduced in series or in parallel, which are included in the communication gap of the combined second terminals of the first, second and third light-emitting elements and the current limiting element, and optical outputs the first, fourth, second and fifth, third and sixth light-emitting elements, respectively, are combined.