JPS60148247A - Signal transmitter using distribution line - Google Patents

Abstract

PURPOSE:To allow a master station device to transmit/receive information to/ form all slave station devices by allowing the master station device installed at a distribution sub-station to transmit an optional two-phas alternately as the reference phase of zero-phase voltage transmission. CONSTITUTION:A slave station sevice 10a takes a phase C and slave station devices 10b, 10c take a phase A as the reference phase respectively. The master station device 9 has a phase A and a phase C transmission section switching capacitors 3a, 3b to the phases A, C by using switches 4a, 4b so as to generate the zero voltage V0. Then a phase A and a phase C reception section taking multiplication outputs 8a, 8b obtained by multiplying voltages 6a, 6b of the phases A and C and the zero-phase voltage V05 obtained from the sum of the three phases at multipliers 7a, 7b as the demodulated outputs are provided. Thus, the phase A, C transmission sections and the phase A, C reception sections are used depending on the transmission/reception of the slave station devices 10b, 10c and the transmission/reception of the slave station device 10a so as to attain the transmission/reception with the slave station devices 10a-10b.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a signal transmission device using a power distribution line, and particularly relates to a signal transmission device that transmits information using a power distribution line with or without a zero-sequence voltage. .

[Background of the invention]

A conventional signal transmission device that transmits information with or without a zero-sequence voltage using a power distribution line was based on the system configuration shown in FIG. That is, a master station device 1 installed in a distribution substation and a slave station device 2 installed on a pole together with a pole switch or a pole transformer.
has the same configuration, and transmission is performed by the master station device 1t or the slave station device 2.
This is done by generating a zero-phase voltage VO by turning on and off the grounded capacitors 3 and 3' connected to the reference phase (human phase in FIG. 1) using switches 4 and 4', respectively. On the other hand, for reception, the zero-sequence voltage (Vo) 5*5' obtained from the sum of the three phases (human phase, B phase, C phase) and the reference phase (A phase) voltage 6.
6' is multiplied by multiplier 7.7', and the multiplication output 8.
8' was used for demodulation and 7 times.

Therefore, the conventional signal transmission device using the zero-phase carrier transmission method is a signal transmission device based on the premise that three phases of the Shojohi electric wire are required and that the same reference phase can be selected.

□ However, in urban areas, where the load is large, high-voltage distribution lines are usually wired in three phases, but in rural areas, where the load is small, only two of the three phases are used, so-called single-phase distribution. If there is a section and considering the load balance, AB
Generally, a single-phase section of a phase, a single-phase section of a BC phase, and a single-phase section of a CA phase coexist. By the way, there is no common reference phase for any of the three single-phase sections mentioned above, and therefore, there are slave station devices that cannot transmit information using conventional signal transmission devices. There were drawbacks.

[Purpose of the invention]

The present invention has been made in view of the above, and its purpose is to provide a power distribution line that allows a master station device to send and receive information to and from all slave station devices even when single-phase sections of three types of combinations coexist. An object of the present invention is to provide a signal transmission device using the. - [Summary of the Invention] The feature of the present invention is that a master station device installed in a distribution substation can alternately transmit and receive arbitrary two phases of three phases of a high-voltage distribution line as a reference phase for zero-phase voltage transmission. The main point is that the structure is equipped with means.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the embodiment shown in FIG. 2 and FIG. 3.

FIG. 2 is a system configuration diagram showing an embodiment of a signal transmission device using a power distribution line according to the present invention. In FIG. 2, reference numeral 9 denotes a master station device 10a installed in a distribution substation.

10b and 10C are three-phase high-voltage distribution lines A and B installed on a pole together with a pole-mounted switch and a pole-mounted transformer, respectively.

A slave station device in the single-phase section of BC, CA, and AB phases of C,
The slave station device 10a uses the C phase as the reference phase, the slave station device 10b uses the human phase (which may be the C phase), and the slave station device 10C uses the human phase as the reference phase. On the other hand, the master station device 9 turns on and off the grounding capacitor 3a to the human phase of the high-voltage distribution line using the switch 4a to adjust the zero-phase voltage V.
A human phase transmitter that generates o and a grounding capacitor 3 on the C phase.
a C-phase transmitter that generates a zero-sequence voltage VO by turning on and off B with a switch 4b, and a zero-sequence voltage obtained from the sum of three phases (human phase, B phase, and C phase). (Vo) 5, the reference phase, and the voltage 6a of the applied A phase are multiplied by the multiplier 7a, and the multiplication output 8a is used as the demodulated output. and a C-phase receiving section that outputs a demodulated output as a multiplication output 8b obtained by multiplying the voltage 6b by a multiplier 7b.

By doing this, slave station device 10b or I
When transmitting/receiving with the OC, the human face transmitter and the human face receiver are used, and when transmitting/receiving with the single station device 10a, the C phase transmitter and C phase receiver are used. You can send and receive data.

On the other hand, as can be seen from the vector diagram explaining the receiving circuit of the slave station devices connected to the single-phase section shown in FIG. Voltage Vo
This is how you get it. That is, to obtain the zero-phase voltage Vo from two phases, for example, A phase and B phase, create a vector sum C/ of the human phase and B phase, and hold the opposite phase C of the vector sum C' in a memory circuit. I'll do what I do. As a result, physiognomy and B
The sum of phase and memory circuit output C phase is zero-sequence voltage VO. Demodulation is performed by multiplying such zero-phase voltage Vo by the voltage of the reference phase (human phase or C phase).

〔Effect of the invention〕

As explained above, according to the present invention, even if single-phase sections with three types of combinations are mixed, the master station device can send and receive information to and from all the slave station devices. .

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of a signal transmission device using a conventional distribution line, Fig. 2 is a system configuration diagram showing an embodiment of a signal transmission device using a distribution line of the present invention, and Fig. 3 is a system configuration diagram of a signal transmission device using a conventional distribution line. FIG. 2 is a diagram illustrating a receiving circuit of a slave station device connected to the single-phase section in the figure; FIG. 3', 3a, 3b・, - grounding capacitor, 4', 4a
. 4b...Switch, 5.5'...Zero-sequence voltage, 6'. 5a, 6b - reference phase, voltage, 8', 8a, 8b -...
Demodulation output, 9... Master station device, 10a to 10C... Slave station equipment 1 evil ABC C treatment 2 calm 3v c) ,,, / l □ \ C'

Claims (1)

[Claims] 1. Depending on the presence or absence of zero-sequence voltage, high-voltage distribution lines are used between the master station equipment installed at the distribution substation and the slave station equipment installed on the pole together with the pole-mounted switch or pole-mounted transformer. In the signal transmission device that transmits information, the master station device is connected to the high voltage distribution line 3.
The reference phase for zero-sequence voltage transmission is alternately set to any two of the phases.
What is claimed is: 1. A signal transmission device using a power distribution line, characterized in that the signal transmission device is equipped with means for transmitting and receiving signals as a signal.