JPS61245724A - Distribution line carrier transmission and reception system - Google Patents

Abstract

PURPOSE:To allow a reception station to receive always a signal even when a standing wave phenomenon is caused by providing both a current detector and a voltage detector to the reception station so as to receive the signal in terms of both current and voltage. CONSTITUTION:A sinusoidal wave signal sent from a transmission station 5 exists on a distribution line 3 in a form of a standing wave when the signal frequency is high or the range of the distribution line 3 is long. In neglecting the loss by the distribution line, both the voltage standing wave and the current standing wave are sinusoidal waves and their maximum values are shifted by 1/4 wavelength. When the reception station 4 is placed near a point B, although the signal cannot be received as a voltage but received as a current. When the reception station 4 is placed near a point A, the signal cannot be received in a form of a current but in a form of a voltage. Thus, even when the standing wave of the signal takes place, the signal is received always by detecting the signal in both forms of current/voltage.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a distribution line transmission and reception system for receiving signals carried on a distribution line! The present invention relates to a distribution line carrier reception system that can receive signals even when a standing wave phenomenon occurs in the signal on the distribution line.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional high-voltage distribution line conveyance system disclosed in, for example, Japanese Patent Application Laid-Open No. 57-28435. In the figure, 1 is a transformer, 2 is a busbar, 3 is a high-voltage distribution line, and 4 is a receiver. 5 is a transmitting station, 6 is a coupling impedance, and 7 is a current detector.

Next, the operation will be explained. The signal output by the transmitting station 5 is transferred to the power transmission line 3 through the coupling impedance 6. This signal is transmitted to the receiving station 4 through the current detector 7 at the receiving end.

[Problem that the invention seeks to solve]

As mentioned above, conventional distribution line conveyance equipment is a system and device that receives signals only with current or only with voltage, so the signal frequency becomes high and the length of the distribution line becomes long. In addition, when using this device when a constant pressure wave phenomenon occurs, it is useful when the receiving station is located at a node of the current standing wave in a system that receives signals only with current, or when the signal is received only with voltage. In the receiving method, there is a problem in that the signal cannot be received when the receiving station is located at a node of a voltage standing wave.

This invention was made to solve the above-mentioned problems, and focuses on the standing wave nature of the signal, and makes it possible for the receiving station to always receive the signal even when the standing wave phenomenon occurs. The purpose is to obtain a distribution line carrier reception system.

[Means for solving problems]

The distribution line carrier reception system according to the present invention is equipped with both a current detector and a voltage detector at the receiving station so that signals can be received from both current and voltage.

[Effect]

A sine wave signal transmitted from a transmitting station of the distribution line carrier transmission method according to the present invention exists as a standing wave on the distribution line when the signal frequency is high or the distribution line length is long. However, in this standing wave, the current is large at points where the voltage is small,
There is a property that the current decreases at a point where the voltage is high. Therefore, even if the signal is too small to be received in terms of voltage, the signal can be received in terms of current.
Conversely, even if the signal is too small to be received as a current, the signal can be received as a voltage.

[Excellent example]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a transformer, 2 is a busbar, and 3 is a high-voltage distribution line (
4 is a receiving station, 5 is a transmitting station, 6 is a coupling impedance, 7 is a current detector, and 8 is a voltage detector.

Next, the operation will be explained.

The sine wave signal transmitted from the transmitting station 5 exists as a standing wave on the power distribution line 3 if the signal frequency is high or the length of the power distribution line 3 is long. For simplicity, if we ignore the loss caused by the distribution line, both the voltage standing wave and the current standing wave become sine waves,
Their maximum values are shifted by 1/4 wavelength. FIG. 2 is a distribution diagram showing the distribution of standing waves of signal voltage and signal current on one power distribution line 3. FIG. In the figure, 1 curve 9 is the power distribution f
The signal voltage distribution on sa, the curve 10 shows the signal current distribution on the distribution line 3. Point (5) is the minimum point of current.

Point (B) is the minimum point type of voltage. Minimum point of current (2
)) corresponds to the maximum point of voltage (Q), and the minimum point of voltage (Q)) corresponds to the maximum point of current (Q). Receiving station 4 is on (
B) When located nearby, the signal cannot be received in voltage, but can be received in current. Receiving station 4 is on (A)
When located nearby, the signal cannot be received by electric current, but
voltage can be received.

When the receiving station 4 is located near the midpoint between points (A) and (B), it is possible to receive signals in the form of current or voltage. In this way, even if a signal standing wave phenomenon occurs, the signal can always be received by detecting the signal both in current and voltage.

〔Effect of the invention〕

As described above, according to the present invention, the reception of distribution line transmission is performed using both current and voltage, so that the signal can be stationary even if the signal frequency is high or the distribution line is long. This has the effect of ensuring that signals can always be received with high reliability even when wave phenomena occur.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a distribution line conveyance system according to an embodiment of the present invention, FIG. 2 is a distribution diagram showing the distribution of standing waves of signal voltage and signal current on one distribution line, and FIG. FIG. 3 is a block diagram showing, for example, a conventional high-voltage distribution line conveyance system. In the figure, 3 is a high-voltage distribution line (power distribution line), 4 is a receiving station,
5 is a transmitting station, 7 is a current detector, 8 is a voltage detector, (A)
is the minimum point of current, and (B) is the minimum point of voltage. In each figure, the same reference numerals indicate the same or corresponding parts. Patent applicant: Mitsubishi Electric Corporation Figure 1, Figure 311I Procedural amendment (voluntary) 60 Hana 8.-1 Showa Month Date

Claims (2)

[Claims] (1) A distribution line carrier reception method that receives a high frequency signal carried on a distribution line, comprising a voltage detector that receives the voltage on the distribution line, and a current detector that receives the current on the distribution line, A distribution line carrier reception system characterized in that signals of both voltage from the voltage detector and current from the current detector are received. (2) The voltage detector and the current detector are characterized in that the signal voltage and signal current on the distribution line detect the voltage at the minimum point of the current, and detect the current at the minimum point of the voltage. A distribution line carrier reception system according to claim 1.