JPS61237528A - Transmission system of low voltage distribution line carrier earth return type - Google Patents

Abstract

PURPOSE:To control a slave station group for plural pole transformers by one repeater by tying earth lines of the secondary side of the plural pole transformers by an interlocked earthing line. CONSTITUTION:The interlocked earthing line ties earthing lines 4a, 4b, 4c of the secondary side of the pole transformers mutually. Thus, a signal sent from a relay station 6a to the earth line 4a or a low voltage distribution line 3a via an earth coupler 5a is sent to the earth lines 4b, 4c or low voltage distribution lines 3b, 3c via the interlocked earthing line 8 and earth couplers 5b, 5c. Thus, a signal is sent to slave stations 7b, 7c under the control of other pole transformers 2b, 2c than the relay station 6 by using the relay station 6 only.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission system using a low-voltage distribution line carrier earth return route system.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional low-voltage distribution line transportation ground return system disclosed in, for example, Japanese Unexamined Patent Publication No. 48-96012. In the figure, 1 is a high-voltage distribution line, 2m, 2b,
2c is a 3m pole-mounted transformer whose primary side is connected to the high-voltage distribution line.
, 3b, 3c are low voltage distribution lines connected to the secondary side of the pole transformer, 4m, 4b.

4c is a grounding wire, 5m, 5b, 5a are grounding couplers, 6a, 6b, 6c are relay stations connected between the primary and secondary sides of the pole transformer, 7m, 7b, 7e are It is a slave station.

Next, the operation will be explained. A signal is sent from the relay station 6a to the grounding line 4a or the low voltage distribution line 3a via the grounding coupler 5a, and the signal is received by the slave station Ta.

The above is the operation for transporting the low voltage distribution line under the pole transformer 2a, but the low voltage distribution line under the pole transformers 2b, 2c, etc. is carried out in the same way.

[Problem that the invention seeks to solve]

Since the conventional transmission system of the low-voltage distribution line carrier earth return system is configured as described above, there is a problem that a relay station must be installed for each pole transformer, which is uneconomical.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a transmission system that allows a single repeater to control a group of slave stations located under a plurality of pole transformers. .

[Means for solving problems]

In the transmission method according to the present invention, the grounding wires on the secondary side of the pole transformer are connected to each other by a connecting grounding wire, and the connected grounding portion has a low impedance for commercial frequencies and a high impedance for signal frequencies. A ground coupler like this is inserted in series.

[Effect]

The connecting ground line in this invention is grounded by a grounding coupler and transmits a signal carried on the low voltage distribution line at a certain point to the low voltage distribution line to which the connecting ground line is connected.

〔Example〕

Hereinafter, a 1*M example of the present invention will be described with reference to FIG. 1, in which the same parts as those of the second prisoner are given the same reference numerals.

In FIG. 1, 8 is the grounding wire 4a on the secondary side of the pole transformer;
This is a connecting ground line that connects 4b and 4e to each other.

With the above configuration, a signal is sent from the relay station 6a to the grounding line 4a or the low voltage distribution line 31 via the grounding coupler 5a. This signal is connected to the connecting ground wire 8, the ground couplers 5b, 5
c via ground wires 4b, 4c or low voltage distribution line 3
b, 3e.

In this way, not only the slave station 7a under the same pole transformer 2a as the relay station 6, but also the slave station 7b under the pole transformer 2b, which is different from the relay station 6.

A signal is also transmitted to 7c.

〔Effect of the invention〕

As described above, according to the present invention, in the low-voltage distribution line carrier return-to-ground system, the number of relay stations is reduced to one by connecting the grounding wires on the secondary side of multiple pole transformers with a connecting grounding wire. An economical transmission method can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a transmission method using a low-voltage distribution line carrying ground return method according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a transmission method using a conventional low voltage distribution line carrying ground return method. 1 is a high voltage distribution line, 2m, 2b, 2e are pole transformers, 3a
, 3b, 3e are low voltage distribution lines, 4a, 4b. 4C is a grounding wire, 5a, 5b, 5, c are grounding couplers, 6a, 6b, 6e are relay stations, 7m, 7b, 7
c is a slave station, and 8 is a connecting ground wire. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A large number of pole transformers connected to a high voltage distribution line, a low voltage distribution line and a grounding line connected to the secondary side of each pole transformer,
A low-voltage distribution line carrying ground return path comprising a grounding coupler connected to this grounding wire, a relay station provided between the primary and secondary sides of the above-mentioned pole transformer, and a slave station connected to the above-mentioned grounding wire. A low-voltage distribution line carrying ground return method transmission method, characterized in that a relay station is provided only on one of the above-mentioned pole transformers, and each of the above-mentioned grounding wires is connected by a connecting grounding wire.