JPH0630461B2 - Communication method using aerial ground wire - Google Patents

Description

TECHNICAL FIELD The present invention relates to a communication system using an aerial shared ground wire, which achieves cost reduction while maintaining reliability.

[Conventional technology]

As a conventional communication method, for example, an FS-modulated high-frequency signal is transmitted via a high-voltage distribution line or a low-voltage distribution line according to the integrated value read by an integrated power meter of a customer, and this is automatically received by a management center. Some have been designed to read the meter.

In this communication system, a high-voltage distribution line is used as a communication medium, so that a high-voltage coupler is located between the repeater and the high-voltage distribution line so that high-frequency signals can be transmitted and received between the repeater and the high-voltage distribution line. It has become. On the other hand, the one that uses the low voltage distribution line as the communication medium is FS between the low voltage distribution lines.
The modulated high frequency signal is injected, and the inter-bank coupler is located between the low voltage line banks.

[Problems to be Solved by the Invention]

However, according to the conventional communication method, in the case of using the high-voltage distribution line, since each customer is connected to the low-voltage distribution line but not to the high-voltage distribution line, the high-voltage distribution line is Since a repeater connected to the electric wire is required, the cost is high and the connection work is complicated, and in the case of using the low voltage distribution line, a plurality of low voltage distribution lines are connected in adjacent parts and the predetermined Since the signal must be transmitted to the central control unit at the position, the inter-bank coupler is required for the connection, which is expensive.

[Means for Solving the Problems]

The present invention uses a high-voltage distribution line for transmission to the central control unit and uses a low-voltage distribution line for connection to each customer in order to suppress high cost, reduce troublesome connection work, and maintain reliability of transmission. In addition, it provides a communication method using an aerial joint ground wire in which high-frequency cutoff (low-pass) grounding means is inserted into a low-voltage distribution line at appropriate intervals to form a closed loop circuit for high-frequency signals. is there.

〔Example〕

Hereinafter, the communication method using the aerial ground wire according to the present invention will be described in detail.

FIG. 1 shows a first embodiment of the present invention, which is 6.6 [KV].
3-phase 3-wire high-voltage distribution line R, S, T and 100/200 [V]
Single-phase three-wire type low-voltage distribution lines X, Y, Z are step-down transformers 1.
They are connected by 0, and the line indicated by Z is a fictitious common ground line. This overhead joint ground wire Z is grounded via a grounding circuit 40 in which a blocking coil 20 having a high impedance with respect to a high frequency signal and an arrester 30 serving as a surge absorber are connected in parallel, and the low voltage distribution line YZ. Is connected to an integrated power meter 50, and a meter reading terminal unit 60 is connected to the integrated power meter 50.
The terminal unit 70 for the meter reading constitutes a terminal unit 70, and the terminal unit 70 is grounded. The aerial joint ground wire Z is grounded at one point via the terminal unit 70,
In other respects capacitor 80 and coupling coil 90
It is grounded via the series circuit. The coupling coil 90 faces one coupling coil 110 of the repeater 100, and the other coupling coil 120 faces the coupling coil 140 of the series circuit of the capacitor 130 and the coupling coil 140 connected to the high-voltage distribution line T. There is. This circuit constitutes a closed circuit for high-frequency signals shown by the dotted arrow.

In the above configuration, the control signal transmitted through the high-voltage distribution line T is input to the repeater 100 by the inductive coupling of the coupling coils 120 and 140, and is jointly aerial by the inductive coupling of the coupling coils 110 and 90 from the relay 100. Output to the ground line Z. The control signal output to the joint overhead ground wire Z controls the terminal unit 70, and the integrated value of the integrated power meter 50 can be read by the terminal portion 60 for meter reading. The read integrated value is passed from the terminal unit 70 through the ground to the coupling coils 90, 11
It is input to the repeater 100 by inductive coupling of 0 and is temporarily stored therein. The stored integrated value is read by a read command, output to the high voltage distribution line T by the inductive coupling of the coupling coils 120 and 140, and input to the host computer of the management center, where it undergoes predetermined arithmetic processing.

As is apparent from the above embodiments, the host computer of the management center coupled to the high voltage distribution line can receive and process data from the low voltage distribution line connected to the high voltage distribution line via the step-down transformer. Generally, multiple low-voltage distribution lines are connected to one high-voltage distribution line,
By providing a management center on the high-voltage distribution line, it is possible to centrally manage a plurality of low-voltage distribution lines.

FIG. 2 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are indicated by the same reference numerals, and thus duplicate description will be omitted, but the ground wire of the terminal unit 70 will be omitted. On the other hand, a closed circuit shown by a dotted arrow is provided by providing a grounding capacitor 150 on the low voltage side of the transformer 10.

1 and 2, the blocking coil 20 of the ground circuit 40 has a high impedance for a high frequency signal, but has a grounding effect for a DC or low frequency component. Further, the arrester 30 absorbs the surge of the overhead joint ground line Z and discharges it to the ground.

In the first and second embodiments described above, the automatic meter reading of the integrating wattmeter is described, but the present invention is not limited to this, and other devices connected to the power distribution line may be controlled.

Further, although FIG. 1 and FIG. 2 show only one block, since the aerial common ground wire is commonly connected to all banks, a blocking coil can be used as a wide range transmission line.

〔The invention's effect〕

As described above, according to the communication system using the overhead joint ground wire according to the present invention, the high voltage distribution line is used for connection with the central control device, and the overhead ground wire of the low voltage distribution line is used for connection with each customer. Moreover, since the overhead ground wire is grounded at intervals by the high-frequency cutoff (low-pass) grounding means, the cost can be suppressed, the complicated connection work can be reduced, and the reliability of the transmission can be maintained.

[Brief description of drawings]

1 and 2 are block diagrams showing first and second embodiments of the present invention. Explanation of symbols X, Y, Z ... Low-voltage distribution line (Z ... overhead ground wire) 10 ... Transformer, 20 ... Earth coil 30 ... Arrestor, 50 ... Integrating power meter 60 ... For meter reading Terminal, 100 ... Repeater

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiko Oba 5-2-1 Ebara, Shinagawa-ku, Tokyo Saneisha Co., Ltd. (56) Reference JP-A-59-229935 (JP, A)

Claims (1)

[Claims] 1. At least one wire T of high-voltage distribution lines R, S, T
Central control means having a data operation unit for transmitting and receiving high-frequency signals to and from, and low-voltage distribution line X having an aerial common ground line Z for receiving the reduced power from the high-voltage distribution lines R, S, T , Y, Z
And a high-frequency coupling section 130 provided on each of the one line T of the high-voltage distribution lines R, S, T and the overhead ground line Z,
Relaying means 100 having high-frequency coupling portions 140, 120, 110, 90 which are respectively coupled to 80 at one end and grounded at the other end; and one terminal of an input / output terminal is connected to the overhead common ground wire Z,
The other terminal is directly or indirectly grounded to 150, and the controlled device 70 such as the terminal portion 60 for meter reading reads the integrated value of the electric power supplied to the load from the low-voltage distribution lines X, Y, Z.
A blocking coil 20 that grounds low frequency components at a ground point provided at a predetermined interval on the aerial joint ground wire Z and has a predetermined impedance value for high frequency components, and is provided in parallel with the blocking coil 20. And a low frequency grounding means 40 including the surge absorber 30. The high frequency coupling parts 110, 90 of the relay means 100,
A closed circuit is formed by the high-frequency coupling section 80 of the overhead shared ground wire Z, the overhead shared ground wire Z, the controlled device 70 and the ground, and a high-frequency control signal is sent from the central control means to the high-voltage distribution line R, It outputs to the 1 line T of S and T, transmits it to the aerial common ground line Z via the relay means 100, and the controlled equipment 70 by the high frequency control signal.
To control the data of the controlled device 70 from the closed circuit to the high frequency coupling parts 140 and 120 of the relay means 100.
And the high-voltage distribution lines R, S, and T via the high-frequency coupling unit 130 to transmit to the one line T, and the central control unit executes the data calculation in the data calculation unit. Communication system using a fictitious common ground line.