JPS62235830A - Low voltage distribution line carrier - Google Patents

Abstract

PURPOSE:To automatically from a section where a signal is sent through a metallic circuit and a section where the signal is transmitted through a return earth by inserting a transformer and a Filter to a low voltage distribution line. CONSTITUTION:A signal sent between low voltage distribution lines of a section 3z is sent between (a) phase 5a of a low voltage distribution line and a ground in a section 5z in excess of a transformer 4. The same potential is given to the (a) phase 5a and the (n) phase 5n of the signal through the presence of a load 5l. Thus, the signal sent through the earth return in the section 5z is received by a reception station 1b through the filter 2b at the receiving end. The signal sent through the metallic circuit in the section 3z is received by a receiving station 1a through the filter 2a at the receiving end.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission system for low-voltage electrical power distribution.

[Conventional technology]

FIG. 4 is a conceptual diagram showing a conventional low-voltage distribution line carrying metal circuit system. In Figure 4 % (la).

(It)) is a transceiver, (ga) and ($lb) are filters that block commercial frequencies and allow signal frequencies to pass through, (31
is a low-voltage distribution line, (8a) is a low-voltage distribution line, (3n
) is the low-voltage wiring line n-phase, (31) is the load, and (9) is the pole transformer.

On the other hand, FIG. 5 is a conceptual diagram showing a conventional low-voltage distribution line transportation ground return system. In FIG. 5, (la).

(lb) is a transceiver, (2a)t(11)) is a filter that blocks commercial frequencies and passes signal frequencies, (5) is a low-voltage distribution line, (5a) is a low-voltage distribution line, (5n) is a In the n-phase low-voltage distribution line, (s4) is a load, (7) is a filter that passes commercial frequencies and blocks signal frequencies, and (9) is a pole transformer.

Next, the operation of the metal circuit system shown in FIG. 4 will be explained using the case of uplink transmission as an example.

In Fig. 4, the signal voltage transmitted from the transmitter (la) is filtered through a filter (8) that passes the signal frequency but not the commercial frequency.
a) is applied between the lines of the low voltage distribution line (3). The applied signal voltage passes through the low voltage distribution ti (31) and is received by the receiver (lb) through a filter (gb) at the receiving end.

Next, the operation of the ground return method shown in FIG. 5 will be explained using an example of uplink transmission. Send in Figure 5! (la
) The signal voltage transmitted from
Applied between 5+ and earth. The applied signal voltage is transmitted through the low-voltage distribution line (5) and passed through the filter fl at the receiving end.
! It is received by the receiver (1b) through l i.

[Problem that the invention seeks to solve]

Conventional low-voltage power distribution line carrier metal circuit systems are configured as described above, so if there is a load with low impedance relative to the signal frequency, such as a capacitor, between the lines of the power distribution line, the signal voltage is short-circuited by the load and the signal is The problem was that it was not conveyed. On the other hand, since the conventional low-voltage distribution line carrying ground return system is constructed as described above, it has the disadvantage that this system cannot be used in places where grounding cannot be established, such as in apartments.

This invention was made in order to solve the above-mentioned problems, and in sections where the load impedance to the signal frequency is small, the ground return method is used for transmission, and in sections where grounding cannot be established, transmission is performed using the metal circuit method. Another object of the present invention is to obtain a system that can switch between transmission using the earth @ road method and transmission using the metal circuit method in any section.

[Means for solving problems]

The low voltage distribution line transport system according to the present invention is designed so that the signal transmission path can be switched between a metal circuit system and a ground return system depending on the section.

[Effect]

The low-voltage distribution line conveyance system according to the present invention divides the sections of the low-voltage distribution system with a transformer and a filter that passes commercial frequencies and blocks signal frequencies. , in the other section, it is transmitted by the return route to the earth.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (la), (lb) h transceiver, (ga
), (gb) t'! Commercial frequency #: tPi1 stop signal frequency passes through filter, (8a) is low voltage distribution line a phase, (3n) is low voltage distribution Al1In phase, (8j) is load,
(8Z) Section where the full gold circuit signal is transmitted, (4:
is the transformer, (5a) is the company's low-voltage distribution line A-phase, (an) is the low-voltage wiring N-phase, (5t) is the load s, (5g) is the section where the signal is transmitted on the return path to the ground, (61 is the short circuit, (7a),
(Wb) and (7c) are filters that pass commercial frequencies and block signal frequencies, (81 is grounded, and (9) is a pole transformer.

First, we will explain the principle of upstream transmission. transmitter (la)
The signal voltage transmitted from the A
It is applied between ffJ (Ila) and the n-phase (3n), and the signal is transmitted using a metal circuit during the interval (8z). In the transformer (41, the low voltage distribution lines of section (8g) and section (SN) are connected.Transformer y#14),
The non-N phase A phase is short-circuited between the primary side and the secondary side (61), and is connected to the low voltage distribution line N phase (SN) in the section (AM) where the signal is transmitted using the ground return path. #:t, transformation!
! The n-phase and the commercial frequency are connected through a filter (?a)t- which allows the signal frequency to pass through. for that,
The signal transmitted between the lines of the low-voltage distribution line in the section (8M) is transferred to the transformer (41t).
It is transmitted between Kan (5a) and the earth. The signal is the load (51)
etc.) 115j in a phase (5a) and n phase (5n)
Ranked 11th. In this way, the signal transmitted using the section (glaze) earth return path is filtered (h) at the receiving end.
gb) ft and is received at the receiving station (lb).

Next, the principle in the downward direction will be described. The signal voltage emitted from the transmitter (2a) passes through the filter (2b) and passes through the section (
as) r, transmitted using earth return FI & meeting.

Section (5g) is grounded to the low voltage distribution line n phase (3n) of section (3z) and Ninaka (8g) through transformer (4) +7]
Therefore, in the section (8g), the signal is transmitted between the lines of the low-voltage distribution line. The signal thus transmitted through the metal circuit over the section (3z) passes through the filter (ja) and t- at the receiving end and is received by the receiving station (la).

In the above embodiment, the low-voltage distribution line was divided into two sections: the section for metal circuit transmission and the section for return-to-earth transmission. They can be connected by (+a) to (4n).

In addition, in the above embodiment, pole-mounted transformation! ! The section adjacent to +91 was the section for return-to-ground transmission, but as shown in Figure 8, there was a pole-mounted transformer! ! (The section adjacent to 91 can also be a section for metal circuit transmission.

〔Effect of the invention〕

As described above, according to the present invention, by inserting a transformer and a filter into the low-voltage distribution line during low-voltage distribution line transportation, P1 is automatically connected to a section in which signals are transmitted by a metal circuit. By returning to the ground, a section can be created for signal transmission. Therefore, in areas where there is no grounding, where transmission could not be achieved using the conventional earth return method, transmission is performed using metal circuits, and in areas where load impedance is small, where transmission is not possible using the conventional metal circuit method, transmission is performed using the earth return path. ,
We can see the effect of creating a method that can transmit data even in areas where conventional methods cannot.

[Brief explanation of drawings]

FIG. 1 is a connection diagram showing a low voltage distribution line transport system according to an embodiment of the present invention, FIGS. 2 and 8 are connection diagrams showing a low voltage distribution line transport system according to another embodiment of the invention, and FIG. 5 is a connection diagram showing a conventional low voltage distribution line carrying metal circuit system, and FIG. 5 is a connection diagram showing a conventional low voltage distribution line carrying ground return system. In the figure, (la)*C1b) Iri transceiver, (l
a) and (2b) are filters that block commercial frequencies and pass signal frequencies, (8&) are low-voltage distribution line carriers, (3n) are low-voltage distribution line n-phase, (aZ) are loads, and (1z) are metal circuits. The section where the signal is transmitted is: 41 is the transformer, (5a
) is low voltage distribution line 1! LID, (521) #: i Low voltage power distribution 1 inch phase, (R) is load, (button) is the section where the signal is transmitted in the earth return path, 161 is short circuit, (Gua) * (Wb) *
(vc), (vaL(7) is a filter that passes commercial frequencies and blocks signal frequencies, (8) is grounding, and (9) is a pole transformer. In the figures, the same symbols are the same - or A considerable portion is shown.

Claims (1)

[Claims] A low-voltage distribution line carrier transmission system that is characterized by dividing a low-voltage distribution line into multiple sections using transformers, and using a metal circuit method or an earth return method as the transmission method for these multiple sections.