JPH11287828A - High voltage distribution line carrier signal coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the equipment costs of a power distribution automation system, by using one connecting device for one monitor-controlling device for an automatic switcher in the power distribution automation system using a high-voltage power distribution line carrier signal. SOLUTION: A monitor-controlling device 10 for an automatic switcher that has a voltage detection circuit 9 for detecting the presence or absence of the voltage of a low-voltage power distribution line 12a, and a connecting device 8 that switches connection capacitors 5a and 5b being used according to the voltage detection result of the monitor-controlling device 10 for the automatic switcher (a switching signal 7) are installed on high-voltage power distribution lines 1a and 1b. Also, the number of the connecting devices that can be installed per one feeder of the power distribution line is limited (the attenuation of high- voltage power distribution line carrier signal due to the connection capacitor), thus composing a system with a finer section as compared with a current system configuration by reducing the number of the connection capacitors being continuously used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution automation device using a carrier signal of a high voltage distribution line.

[0002]

2. Description of the Related Art FIG. 2 is a distribution diagram of a high-voltage distribution line showing an example of a conventional automatic distribution system. 1a, 1b
Is a high-voltage distribution line, 2 is an automatic switch for dividing the high-voltage distribution line distribution system installed on the high-voltage distribution lines 1a and 1b, 3a, 3
b is a transformer, 4a and 4b are coupling devices, 5a and 5b are coupling capacitors, 6a and 6b are coupling filters, 8 is an automatic switch monitoring and control device (hereinafter, a controller), 10 is a power supply unit,
Reference numeral 11 denotes a transport unit, and reference numerals 12a and 12b denote low-voltage distribution lines. In FIG. 2, the high-voltage distribution line carrier wave signal used in the transport unit 11 of the controller 8 is injected into the high-voltage distribution lines 1a and 1b by the two coupling devices 4a and 4b or the high-voltage distribution line 1
Extraction from a and 1b is performed.

Power supply using the high voltage distribution lines 1a and 1b is not always performed from the A side to the B side. A
If an accident such as a ground fault occurs in any of the sections on the side, power supply after the accident section is cut off. After that, the power is exchanged from the link point switch of another feeder, and the power is supplied from B to the A side depending on the location. In the high-voltage distribution line carrier wave system, the power supply from the B side to the A side means that the command signal to the controller 8 for controlling the automatic switch 2 is connected to the connection provided on the B side of the automatic switch 2. It will be extracted from the device 4b. In other words, in the distribution automation system using the high voltage distribution line transport signal, in order to cope with accidents in all sections, the high voltage distribution line transport can be received from both sides A and B so that both sides of the automatic switch 2 can be received. Are provided with coupling devices 4a and 4b.

[0004]

However, while consumers are demanding reductions in power rates and demands for drastic cost reductions in power distribution equipment, two controllers are connected to one controller. The use of the device is costly. When one coupling device is installed on the A side (or B side) for one controller, the B side (or A
Side), it was not possible to solve the problem that injection and extraction of a high-voltage distribution line carrier signal could not be performed.

The present invention has been changed to a distribution automation system in which two coupling devices have been used for one controller because of the operation of the distribution automation system, and one coupling device is used for one controller. The purpose is to be able to build a distribution automation system.

[0006]

According to the present invention, in order to achieve the above object, a coupling device and a controller proposed by the present invention are installed on a high voltage distribution line, and lead wires of the coupling device are provided on both sides of an automatic switch. And the connected output is connected to one coupling device. Inside the coupling device, based on the detection result of the controller low-voltage detection circuit (the controller always monitors the A-side voltage of the low-voltage distribution line), the high-voltage distribution line carrier wave signal extraction port from the high-voltage distribution line, Switch the high-voltage distribution line carrier wave signal inlet to the distribution line.

[0007]

FIG. 1 shows an example of a high-voltage distribution line distribution system diagram of a distribution line automation system to which the present invention is applied. In the figure, 1a and 1b are high-voltage distribution lines, 2 is an automatic switch,
3a and 3b are transformers, 4 is a coupling device, 5a and 5b are coupling capacitors, 6 is a coupling filter, 7 is a switching signal for switching the coupling capacitors 5a and 5b, 8 is a controller, 9 is a low-voltage detection circuit, 10 Denotes a power supply unit, 11 denotes a transport unit, and 12a and 12b denote low voltage distribution lines. High voltage distribution line 1
a, 1b, the automatic switch 2, the coupling device 4, and the controller 8 are installed, and the low-voltage distribution line 12a is connected to the voltage detection circuit 9 of the controller 8.
It is connected to the.

When power is supplied from the A side to the B side, the controller 8
The voltage detection circuit 9 detects that there is a voltage on the low voltage distribution line 12a (transformed by the transformer 3a installed on the high voltage distribution line 1a). The coupling device 4 selects the coupling capacitor 5a as the coupling capacitor to be used based on the detection result (the switching signal 7). Therefore, the high voltage distribution line carrier signal is injected and extracted using the outlet of the high voltage distribution line 1a, the coupling capacitor 5a, and the coupling filter 6.

At this time, if an accident such as a ground fault occurs in any section on the A side and a power outage occurs after the accident section, the voltage of the high-voltage distribution line 1a becomes zero. The low-voltage distribution line 12a also has no voltage. Thereafter, the voltage detection circuit 9 of the controller 8 detects the absence of the voltage on the low-voltage distribution line 12a, and outputs a switching signal 7 for switching to the coupling capacitor 5b of the coupling device 4. As a result, the high-voltage distribution line carrier wave signal is injected and extracted using the outlet of the high-voltage distribution line 1b, the coupling capacitor 5b, and the coupling filter 6.

[0010] Even if power is supplied from the side B by the coordination and interchange of other feeders, the voltage detection circuit 9 operates in the low voltage distribution line 12b
Is not monitored and the current state is maintained. However, when the automatic switch 2 is turned on by some operation, the low-voltage distribution line 12a has a voltage, and the signal injection and extraction circuit configuration corresponding to the low-voltage distribution line 12a side is again achieved.

[0011]

As described above, if the coupling device and the controller according to the present invention are applied to a power distribution automation system, a significant cost reduction can be expected. Also, since the number of coupling devices that can be installed per feeder of the distribution line is limited (attenuation of the high-voltage distribution line carrier signal by the coupling capacitor), the system is configured in a finer division than the current system configuration by reducing the number of coupling capacitors that are always used. I can do it.

[Brief description of the drawings]

FIG. 1 is an example of a high-voltage distribution line distribution system diagram of a distribution automation system to which the present invention is applied.

FIG. 2 is an example of a conventional high-voltage distribution line distribution system diagram in a distribution automation system.

[Explanation of symbols]

 1, 1a, 1b High-voltage distribution line 2 Automatic switch 3a, 3b Transformer 4, 4a, 4b Coupling device 5a, 5b Coupling capacitor 6, 6a, 6b Coupling filter 7 Switching signal 8 Automatic switch control device 9 Voltage detection circuit 10 Power supply Unit 11 Conveying unit 12a, 12b Low-voltage distribution line

Claims (2)

[Claims] 1. A monitoring and control device for an automatic switch having a voltage detection circuit for detecting presence / absence of a voltage of a low-voltage distribution line and outputting a detection result to an outside in an automatic distribution system using a high-voltage distribution line transfer signal. 2. A coupling device capable of switching a coupling capacitor to be used internally based on a voltage detection result of the monitoring and controlling device for an automatic switch.