RU144059U1 - NON-CONTACT VOLTAGE SIGNALIZER - Google Patents

Abstract

A non-contact voltage signaling device consisting of a receiver in which an antenna, an amplifier-driver, a discriminator of the period and number of pulses, an integrating element, a threshold device, an indication unit, characterized in that an oscillating circuit, two focusing devices, and a power supply are additionally introduced into it, are connected in series and a transmitter with an antenna, the input of which is connected to the power supply, and the first focusing device is installed on its antenna, the second focusing device is installed on the receiving antenna ka and connected to the input of the oscillatory circuit, the output of which is connected to the input of the amplifier-former.

Description

The utility model relates to the measuring field of technology, and more particularly to devices for remote non-contact detection of alternating voltage and determining the voltage level on the conductor.

Known non-contact voltage detector, which includes an antenna, amplifier driver, an integrating element in the form of a capacitor, threshold device, display unit (E. Figurov and other non-contact voltage detector in a helmet - To help the ham radio, 1982, issue 77, p. . fourteen).

The disadvantage of this device is that even small amplitude pulses of voltage at the output of the device cause its false response in view of the large gain, and therefore high sensitivity.

Known non-contact voltage detector containing a series-connected antenna, amplifier-driver, an integrating element, a threshold device and an indication unit, it is additionally introduced a period and number of pulse discriminator (RF patent No. 2134909, IPC: G08B 29/06, published on 08.20.99 G., BI No. 23, Kuzmin V.A., etc.).

The disadvantage of this device is a false alarm, due to the low noise immunity of the alarm.

The authors chose this technical solution as a prototype.

The technical result is to increase the reliability of the alarm about the presence of voltage, due to increased noise immunity.

The technical result is achieved by the fact that in a non-contact voltage detector, consisting of a receiver in which an antenna, an amplifier-driver, a discriminator of the period and number of pulses, an integrating element, a threshold device, an indication unit are connected in series, according to a utility model, an additional oscillating circuit and two focusing devices are additionally introduced , a power supply unit and a transmitter with an antenna, the input of which is connected to the power supply unit, and a first focusing device and a second focusing device are installed on its antenna stroystvo receiver antenna is mounted on and connected to the input of the oscillation circuit whose output is connected to the input of the amplifier-driver.

Introduction to the previously known circuit of the oscillatory circuit, which is installed in the antenna circuit of the receiver, electromagnetic wave transmitter, focusing devices of the transmitter and receiver, transmitter power supply completely eliminates the false response of the device and increases the reliability of the devices. Antennas and focusing devices of the transmitter and receiver allow you to directionally receive and send an electromagnetic wave.

In FIG. contactless voltage indicator is presented.

The non-contact voltage detector consists of a receiver 1, a transmitter 2 and a power supply 3, antennas of a transmitter 5 and a receiver 7, a first focusing device 4 of a transmitter, a second focusing device 6 of a receiver, an oscillating circuit 8, an amplifier-shaper 9, a period discriminator and a number of pulses 10, an integrating element 11, a threshold device 12, an indication unit 13.

The device operates on the principle of transmitting and receiving a signal. To transmit the signal, an electromagnetic wave transmitter is used, in which the transmitter 2 itself and the power supply 3 are installed. This device does not respond to single voltage pulses and to low-frequency voltage pulses. In the case of a single voltage pulse, the discriminator of the period and the number of pulses 10 is cocked. The charging process of the integrating element 11 begins. However, it does not have time to charge to a threshold voltage sufficient to trigger the threshold device 12 during the period discriminator pulse and the number of pulses 10. At the end of a single period discriminator pulse and number of pulses 10, the integrating element 11 quickly, with a current of N times greater than the incoming current, discharges to the initial voltage. Thus, the device does not respond to single voltage pulses. Upon receipt of low-frequency pulses, processes similar to the previous ones occur, since when the pulse period is shorter than the pulse duration of the waiting multivibrator, the latter does not restart and thus the charge process of the integrating element 11 begins each time from the initial voltage. Therefore, the device perceives each voltage pulse of the low-frequency sequence as a single one. The transmitter 2 sends an electromagnetic wave using the first focusing device 4 of the transmitter and the antenna of the transmitter 5 with a certain frequency f.

When this wave is reflected from a voltage-free conductor, the receiver 1, due to the antenna of the receiver 7, the second focusing device 6 of the receiver and the oscillating circuit 8 tuned to the operating frequency, receives the signal, amplifies it to the desired value by the amplifier-shaper 9 and perceives it as a low-frequency voltage pulse. Due to the discriminator of the period and the number of pulses 10, this pulse passes, charges the integrating element 11, but it does not have time to charge up to the voltage of the threshold device 12 and does not display the voltage on the display panel 13.

When a sent wave is reflected from a live conductor, the receiver 1, due to the antenna of the receiver 7, the focusing device of the receiver 6 and the oscillating circuit 8 tuned to the operating frequency, receives a signal, amplifies it to the desired value by the amplifier-shaper 9 and perceives it as a wave with a frequency , which will be N times higher than the frequency of the reflected wave from the conductor, which is without voltage. The period T of the frequency of the perceived signal will be equal to the period of the pulse duration of the waiting multivibrator, i.e. T = T _and . In this case, the discriminator of the period and number of pulses 10 is charged and charges the integrating element 11 to the voltage of the threshold device 12, respectively, it is triggered and displays the voltage on the display panel 13.

The proposed technical solution allows to increase noise immunity up to 95%, the reliability of the presence of voltage, ensures the safety of the employee.

Claims (1)

A non-contact voltage signaling device consisting of a receiver in which an antenna, an amplifier-driver, a discriminator of the period and number of pulses, an integrating element, a threshold device, an indication unit, characterized in that an oscillating circuit, two focusing devices, and a power supply are additionally introduced into it, are connected in series and a transmitter with an antenna, the input of which is connected to the power supply, and the first focusing device is installed on its antenna, the second focusing device is installed on the receiving antenna ka and connected to the input of the oscillatory circuit, the output of which is connected to the input of the amplifier-former.