RU2473922C1 - Device to detect and alarm when approaching power transmission line - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: into a device to detect and alarm when approaching power transmission lines (PTL) there are additionally installed the following components: a broadband amplifier and a signal amplitude limiter, at the same time the broadband amplifier may be arranged with input resistance of less than 10 kOhm, as a result of which additional protection of the device is achieved against action of atmospheric moisture due to lower level of input shunting with low resistance of water.

EFFECT: higher distance of detection of power transmission lines by reduction of a level of components in a spectrum of a pulse noise, getting into a strip filter pass band, relative to the signal level induced by power transmission lines.

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Description

The invention relates to signaling systems and, in particular, to a device for detecting and signaling as mobile equipment approaches power lines (power lines).

A known power line detector containing an antenna, a digital processing and signaling device (a contactless voltage signaling device in a helmet / EP Figurnov et al. // To help a radio amateur: Collection. Issue 77. 1982. C.14), also known non-contact voltage detector according to the patent of the Russian Federation No. 2134909, designed for remote and non-contact detection of power lines, electrical installations, hidden electrical wiring under voltage.

A common disadvantage of such devices is the low detection range of power lines due to insufficient sensitivity.

There is also a device for detecting and signaling when approaching a crane to a power transmission line according to RF patent No. 2097895, the functional diagram of which is shown in Fig. 1, taken as a prototype, comprising an antenna 1, a narrow-band filtering and amplification unit 2, a digital processing and signaling device 3.

The disadvantage of the prototype is the low range of determining power lines when using it on land mobile equipment due to broadband impulse noise, for example, from internal combustion engines with broken shielding of high-voltage ignition circuits. When the prototype is located near the source of broadband impulse noise, the interference is received by antenna 1, after which the components of the spectrum of broadband impulse noise falling into the passband of the narrow-band filtering and amplification unit 2 are amplified and can cause false alarms about the detection of power lines in the digital processing and signaling device 3 This imposes a restriction on the gain of the narrow-band filtering unit and gain 2, which reduces the detection range of power lines.

The aim of the invention is to increase the detection range of power lines by reducing the level of the components of the spectrum of broadband impulse noise falling into the passband of the narrow-band filtering and amplification unit.

To this end, a device for detecting and signaling when approaching a power line, comprising an antenna, a narrow-band filtering and amplification unit, a digital processing and signaling device, the input of which is connected to the output of the narrow-band filtering and amplification unit, has a broadband amplifier and a signal amplitude limiter, the output being the antenna is connected to the input of the broadband amplifier, the output of the broadband amplifier is connected to the input of the signal amplitude limiter, the output of which is connected to the input of the narrow-band unit osnoy filtering and amplification.

In addition, the broadband amplifier can be made with an input impedance of less than 10 kΩ.

Figure 1 shows a functional diagram of the device of the prototype.

Figure 2 shows a functional diagram of the inventive device.

A device for detecting and signaling when approaching a power line (Fig. 2) contains an antenna 1, a narrow-band filtering and amplification unit 2, a digital processing and signaling device 3, the input of which is connected to the output of the narrow-band filtering and amplification 2, a broadband amplifier 4 and a limiter the amplitude of the signal 5, and the output of the antenna 1 is connected to the input of the broadband amplifier 4, the output of the broadband amplifier 4 is connected to the input of the limiter of the amplitude of the signal 5, the output of which is connected to the input of the unit narrowband 2 filtering and amplification.

In the particular case of the implementation of the device for detection and signaling when approaching the power line, a broadband amplifier 4 of its composition can be made with an input impedance of less than 10 kOhm.

A device for detecting and signaling when approaching a power line operates as follows. In antenna 1, the electric field of the power transmission line induces an alternating voltage with a frequency of 50 Hz. In addition, the antenna 1 is affected by impulse noise, for example, from internal combustion engines with broken shielding of high-voltage ignition circuits. The alternating voltage induced by the power line and the wideband impulse noise are amplified by the broadband amplifier 4, the output voltage of which is limited by the signal amplitude limiter 5. The broadband impulse noise in the signal amplitude limiter 5 is limited in amplitude, and the signal from the power line remains unchanged. With a decrease in the amplitude of the broadband impulse noise, the amplitudes of all its spectral components proportionally decrease, including those falling into the passband of the narrow-band filtering and amplification unit 2. Accordingly, the likelihood of a false response of the device about the detection of power lines with a digital signal processing and signaling device 3 from wideband decreases pulse interference, while maintaining the ability to detect a real power line with an increase in its detection range.

In the case of a broadband amplifier 4 with an input resistance below 10 kOhm, an additional protection for the detection and signaling device when approaching the power line from atmospheric moisture is achieved by reducing the level of input shunting by low water resistance.

Antennas for receiving an electric field, broadband amplifiers, amplitude limiters, narrow-band filtering and amplification units, digital processing and signaling devices are well known. The modern level of technology allows them to be implemented with the parameters necessary to build the described device for detection and signaling when approaching a power line.

The device is part of a system for preventing collisions of vehicles, a prototype was made, the pilot operation of which confirmed an increase in the range of determining power lines.

Claims (2)

1. A device for detecting and signaling when approaching a power line, comprising an antenna, a narrow-band filtering and amplification unit, a digital processing and signaling device, the input of which is connected to the output of the narrow-band filtering and amplification unit, characterized in that a broadband amplifier and a signal amplitude limiter, wherein the antenna output is connected to an input of a broadband amplifier, the output of a broadband amplifier is connected to an input of a signal amplitude limiter, the output of which connected to the input of the narrowband filter and gain block. 2. A device for detecting and signaling when approaching a power line according to claim 1, characterized in that the broadband amplifier is made with an input impedance of less than 10 kOhm.

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