SU1711096A1 - Phase-sequence indicator - Google Patents

Abstract

The invention relates to devices for measuring electrical quantities and can be used to determine the conditional number or letter designation of the phase of the electric network to be measured. The aim of the invention is to expand the function of the phase indicator capabilities by providing self-monitoring of the input voltages. The phase indicator contains a series circuit of capacitors 1 and 2, resistor 3, inputs 4 and 5 of the phase indicators, first display element 6, common input 7, the second series circuit of resistors 8 and 9, the capacitor 10, the second element 11 of the display. The proposed Phase indicator can also be used as an indicator of the presence of voltage in a circuit. 3 il.

Description

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The invention relates to devices for measuring electrical quantities and can be used to determine a conventional number or letter,. designation of the phase of the measured electrical network, as well as to monitor the presence or absence of phase voltage during repairs in electrical distribution devices and various electrical installations.

The purpose of the invention is the extension of functional capabilities due to the self-control of input voltages.

On league. 1 shows a diagram of the phase indicator; in fig. 2 and 3 are voltage diagrams for connecting phase B and phase C to the second input, respectively. 20

The device (Fig. 1) contains a series circuit of the first 1 and second 2 capacitors and the first 3 resistors connected between the first 4 and second 5 pointer inputs, the total 25 connection points of the first 1 and second 2 capacitors are connected through the first display element 6 to the common input 7, and the resistance of the first capacitor 1 at the frequency of the monitored network is twice as large as the resistance of the second capacitor 2, and their total resistance is 1.73 times greater than the resistance of the first 1 resistor, - 35

A second series circuit of the second 8 and third 9 resistors and the third capacitor 10 is connected in parallel to the first serial circuit, and the free terminals of the second 40 resistor B and the third capacitor 10 of the second serial circuit are connected respectively to the terminals of the first capacitor 1 and the first resistor 3 of the first serial 45 a circuit connected to the first 4 and second 5 inputs of the pointer, and the second display element 11 is connected between the common connection point of the second 8 and third 9 resistors with a common input $ 7 house 7.

The device works as follows.

When the common input 7 is connected to the neutral wire of the monitored network, 55 A input 4 to the phase taken as the reference point (usually phase A), the voltage of this phase is applied through the capacitor 1 and the resistor 8 respectively to the h elements and 11 indications that light TC, indicating the presence of voltage at the input terminal 4.

Connecting with the help of a wire with a plug to the input 5, the voltage of the other AAS, determine their code name by the fact that both of these phases cause the LED 6 to illuminate and what the LED 11 to glow.

When connected to the input 5 of the phase B, the line voltage or il is applied to the serial RC circuits. As follows from the diagram of voltages Lig. 2, the voltage on capacitors 1 and 2 lags behind the voltage on resistor 3 or 90, and the potential at point m is the same as or close to the potential of the neutral wire N, so the voltage on indicator 6 is close to zero and it does not light up. The voltages on the resistors 8 and 9 are ahead of the voltage on the capacitor 10 by 90 °, and the potential at point n is significantly higher than the potential of the neutral wire N, therefore the display element 11 is lit by the voltage applied to it, indicating that input terminal 5 is connected to Aaze B, i.e. a base that lags behind Lazy, taken as a reference point.

When connected to input 5 of Lazi C, the voltage diagram has the form given in Lig. 3, where the potential of point n is close to the potential of the neutral wire B, therefore the voltage on the display element 11 is close to zero and it does not light, and the voltage on the indicator 6 is maximum and it is lit indicating the connection to input 5 of the leading phase C.

If any of the phases to which the inputs of the device are connected break, both indicators are illuminated, since they are under the phase voltage of the network.

Any light-emitting elements can be used as display elements.

The phase indicator can also be used as an indicator of the presence of voltage in the circuit.

Claims (1)

Invention Formula A base indicator containing a series circuit of the first and second capacitors and the first resistor connected between the first and second pointer inputs, the common connection point of the first and second capacitors is connected through the first display element to the common input, and the resistance of the first capacitor at the frequency of the monitored network is selected two times the resistance of the second capacitor, and their total resistance is 1.73 times greater than the resistance of the first resistor, which is different from the fact that, in order to expand, the functional By providing self-control input voltages, a second series of a second and third resistors and a third capacitor and a second display element are introduced, with the free terminals of the second resistor and the third, a capacitor of the second series circuit connected to the first capacitor and the first resistor, respectively. a serial circuit connected to the first and second inputs of the pointer, and the second display element is connected between the common junction point of the second and third p The resistors and the common input, the resistance of the second resistor is chosen twice as large as the resistance of the third resistor, and their total resistance is 1.73 times higher than the resistance of the third capacitor at the frequency of the monitored network.