JPH0342379Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wireless reference phase detection device that has a simple configuration while maintaining excellent workability and detection accuracy.

Conventional reference phase detection is performed by receiving a signal injected from one end of a power outage line at a detection end, or by coupling a high frequency transceiver to the power distribution line to transmit and receive a high frequency signal. This detection method is superior in terms of workability and detection accuracy compared to the method in which workers follow the track sequentially and visually inspect it, but the former requires cumbersome procedures such as acquiring power outages. Furthermore, it takes about a week to obtain the data, and the latter may require a complicated device.

This invention was made in view of the above,
In order to simplify the configuration while maintaining excellent workability and detection accuracy, the voltage signal at the detection point and the voltage signal at the remote point received wirelessly from the remote point are compared in phase. The present invention provides a wireless reference phase detection device that allows a worker at a point to communicate by voice.

The wireless reference phase detection device according to the present invention will be described in detail below.

Figures 1 to 3 show an embodiment of the present invention,
In FIG. 1, for example, a construction point A and a supply point B are located at both ends of a road crossing section 30 with a distance of ₀ , and the construction point A is detected by inputting the phase voltage signal of the construction point A through the electrode _P1 . A main body 10 is provided, and a phase voltage signal of the supply point B is connected to the supply point B at a distance from the construction point A.
A transmitting section 40 is provided which inputs the phase voltage signal via _P2 and wirelessly transmits the phase voltage signal to the detection main body 10 (the detection main body 10 and the transmitting section 40 are each provided with a speaker and a microphone). FIG. 3 shows the detection main body 10 and the transmitter 40. The detection main body 10 includes an electrode 11, P ₁ that is electrostatically coupled to the distribution line, and an amplifier 1 that amplifies the phase voltage signal input from the electrode 11.
2, a rectangular conversion circuit 13 that converts the amplified signal into a rectangular wave, and a phase comparison circuit 14 that compares the phases of the rectangular wave signal of the rectangular conversion circuit 13 and a rectangular wave signal of a supply point B, which will be described later, and a phase difference based on the phase comparison. a common-mode detection circuit 15 that determines that the phase is in-phase when it is within a range of ±45°, and outputs a different signal when it deviates from the range;
an alarm circuit 16 that issues an alarm (regardless of lamp, buzzer, or sound) when a different signal is output;
A receiving antenna 20 that receives the modulated signal of the rectangular wave signal at supply point B, a receiving amplifier 19 that amplifies the received signal, a detection circuit 18 that detects the amplified received signal, and a rectangular wave signal obtained by shaping the detected signal. a waveform shaping circuit 17 that inputs the signal to the phase comparator circuit 14;
Modulation circuit 31 that modulates the worker's voice in the microphone
, an amplifier circuit 32 for amplifying a modulated signal, a switch 33 for switching transmission/reception of an antenna signal and a microphone signal, and a switch 39 for switching between phase comparison and speaker use. an amplifier ₂₂ that amplifies the phase voltage signal input from the electrode 21, and a rectangular conversion circuit 23 that converts the amplified signal into a rectangular wave;
A modulation circuit 24 that modulates the rectangular wave signal of the rectangular conversion circuit 23 in a radio frequency band (for example, 144 MHz, FM method), and a transmission amplifier 25 that amplifies the modulated signal.
, a transmitting antenna 26 that transmits the amplified signal to the detection main body 10, a switch 27 that switches between transmitting and receiving the antenna, and a receiving amplifier 28 that amplifies the received signal.
, a detection circuit 29 that detects the amplified signal and outputs it to a speaker, and a microphone connected to the changeover switch 35.

FIG. 2 shows signal waveforms of each part of the transmitter 40,
a is a sine wave output from the amplifier 22, b is a rectangular wave output from the rectangular conversion circuit 23, c is a high frequency signal of several to tens of kilohertz oscillated in synchronization with the rectangular wave,
and d are modulation signals frequency-modulated in the 144MHz band.

To explain the operation in the above configuration,
Electrode 11 of detection main body 10, P ₁ and transmitter 40
The electrode 21, _P2 of the power distribution line is fixed to one electric wire at the construction point A and the supply point B, and a phase voltage signal is inputted. This phase voltage signal is transmitted to the rectangular conversion circuits 13 and 23.
is converted into a square wave signal. The rectangular wave signal b of the rectangular conversion circuit 23 is sent from the modulating circuit 24 as a frequency modulated signal d from the transmitting antenna 26 to the receiving antenna 20.
After being amplified by an amplifier 19, it is detected by a detection circuit 18. The detected signal is passed through the waveform shaping circuit 17
The signal is waveform-shaped and input to the phase comparison circuit 14 as a rectangular wave signal b. Here, the rectangular conversion circuit 13
The phase difference is compared with the square wave signal of ±
It is determined that they are in phase when they are within a 45° range, and a different signal is output when they are outside that range. When the difference signal is output, the alarm circuit 16 issues an alarm. This operation is repeated for each phase of the RST, and based on the detection results, each phase is assigned a color according to the RST.

Application examples of the present invention include matching after construction work such as road crossings, coloring the phase from a substation to a distribution line, and phase inspection work at a point several tens of meters or more away. Note that if the 144MHz FM method is used as in the above-mentioned embodiment, the frequency band is a general transceiver band, so it is outside the scope of the Radio Law and can be carried out without a license. Further, since the microphone, speaker, and transmitting/receiving circuit are integrated into the detection main body 10 and the transmitting section 40, workers can communicate with each other by phone without reducing work efficiency.

As explained above, the wireless reference phase detection device according to the present invention compares the phase of the voltage signal at the detection point and the voltage signal at the remote point received wirelessly from the remote point,
Further, in this work, since the worker at the remote point of the detection point can communicate by voice, the configuration can be simplified while maintaining excellent workability and detection accuracy.

[Brief explanation of the drawing]

1, 2a to 2d, and 3 show an embodiment of the present invention, in which FIG. 1 shows a detection state, FIGS. 2a to d show signal waveforms, and FIG. 3 shows an embodiment of the present invention. A block diagram of the detector is shown. Explanation of symbols: 10...detection main body, 40...transmission unit, A...construction point (detection point), B...supply point (remote point).

Claims (1)

[Claims for Utility Model Registration] Phase detection judgment that detects the phase voltage at one point on the distribution line and compares this phase voltage with the phase voltage at a remote point at a certain distance from the one point to determine whether they are in phase or different. and remote point phase detection means for detecting the phase voltage at the remote point and providing this phase voltage to the phase determining means by wireless transmission, the phase detection determining means detecting the phase voltage at the one point. phase comparison means for comparing the phase voltage at the one point and the phase voltage at the remote point; in-phase detection means for determining in-phase or different based on the output of the phase comparison means; a wireless receiving means for wirelessly receiving the phase voltage at a point; and a wireless transmitting means for providing the voice of the worker at the one point to the remote point phase detecting means by wireless transmission, the remote point phase detecting means comprising: a detection means for detecting a phase voltage at a remote point; a wireless transmission means for providing the phase voltage at the remote point to the wireless reception means of the phase detection and determination means by wireless transmission; and a wireless reception means for transmitting the voice of the worker. the phase detection and determination means further includes a voice generation means for switching the wireless reception means to generate the voice of the worker at the remote point; The remote point phase detection means has a configuration that switches the wireless transmission means to provide the voice of the remote point worker to the wireless reception means of the phase voltage detection and determination means by wireless transmission. Wireless reference phase detection device.