JP2916075B2 - Distribution system disconnection detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting disconnection of a power distribution system.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory diagram for explaining a conventional disconnection detecting method. This shows one switch slave station, and a plurality of such switch slave stations 1 are arranged on the distribution line 4 at predetermined intervals. Each switch slave station 1 is connected, for example, between two of the three phases, here, between a and c phases (to be supplied with power), and the sensor 6 detects the voltage and current of each phase. Disconnection, open phase, short circuit, ground fault, etc. are detected from the state.

[0003]

However, in the above case, since the communication with the center (device) cannot be performed due to the loss of power of the switch slave station, the phase to which the switch slave station is connected, that is, the ac phase Is connected to
There is a problem that disconnection of the phases c and c cannot be detected.
Therefore, it is conceivable to have a battery immediately. However, since this is subject to aging and the number of switchgear slave stations is enormous, installation and replacement are extremely difficult and monitoring is not easy. There is also a problem that it is difficult to be practical. Therefore, an object of the present invention is to make it possible to reliably detect disconnection without using a battery.

[0004]

In order to solve such a problem, according to the present invention, a plurality of switch substations are arranged at predetermined intervals on a three-phase distribution line, and the switch substations from each of the switch substations are arranged. In detecting a disconnection of a distribution line by collecting information at a central unit via a communication means, each switch substation is connected between a first phase and a second phase to supply power. A function of detecting at least a disconnection from an abnormality in voltage and current is provided. The disconnection of the third phase and its section are detected based on information indicating the disconnection from the associated switch substation, and the disconnection of the first and second phases is performed. And the section is information on which switch slave station has become unresponsive to the communication from the central unit, and all of the subsequent switch slave units are in response to the communication from the central unit. To detect from the information that there is no response. It is a symptom.

[0005]

[Function] Each switch substation located at a predetermined interval on a distribution line has a function of detecting at least a disconnection from the voltage and current states, and the information from all switch substations is referred to at the center (device). By doing so, it is possible to reliably detect the disconnection and the disconnection section without using a battery.

[0006]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.
Reference numerals 1 to 1n indicate switch substations, 21 to 2n indicate switches, 3 indicates a processing unit (CPU) provided in a substation, 4 indicates a distribution line, and 5 indicates a communication line. In addition, switch child station 11-
1n is again connected between the a and c phases. Now, in such a configuration, for example, a point P in FIG.
It is assumed that disconnection has occurred in 1. At this time, switchgear slave station 1
Since the control power supplies 1 to 1n are connected between the lines a and c, the case where the disconnection is the line a or the line c and the case other than that are considered separately.

First, when the disconnection of the point P1 occurs other than the lines a and c, the switch slave stations 11 and 12 detect normality,
Since the disconnection is detected after the switch slave station 13, the CP
By analyzing these pieces of information in U3, it is possible to detect that a disconnection has occurred between the switch slave stations 12 and 13. On the other hand, when the disconnection at the point P1 occurs on the a-line or the c-line, the switch slave stations 11 and 12 detect that they are normal, and transmit a response to that effect to the center (device). Since there is no power at the switch slave station 13 and subsequent switch slave stations, there is no response to communication from the center (device). Therefore, the CPU 3 comprehensively analyzes these pieces of information to detect that a disconnection has occurred between the switch slave stations 12 and 13. At this time, it is a precondition that each switch slave station itself is normal, that the communication line 5 has no abnormality and that communication is performed normally.

[0008]

According to the present invention, the individual switch substations arranged at predetermined intervals on the distribution line are provided with a function of detecting at least a disconnection state from abnormalities in voltage and current. Is comprehensively determined, the advantage that the disconnection and the section thereof can be reliably detected without using a battery.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a general example of a switch slave station.

[Explanation of symbols]

1,11-1n ... Switch slave station, 2,21-2n ... Switch, 3 ... Processor (CPU), 4 ... Distribution line, 5 ... Communication line, 6 ... Sensor.

Continued on the front page (73) Patent holder 000006013 Mitsubishi Electric Corporation 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Kiyoji Mika 3-2-2-3 Nakanoshima, Kita-ku, Osaka-shi, Osaka Kansai Electric Power Stock In-house (72) Inventor Tomoaki Nobukata 3-2-2 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inside Kansai Electric Power Company (72) Inventor Yasunobu Yoshimura 1-1-1, Shibaura, Minato-ku, Tokyo Toshiba Corporation Inside the head office (72) Inventor Koichi Nagao 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Inside Omika Plant, Hitachi, Ltd. Inside Electric Co., Ltd. (72) Inventor Makoto Tange 1-2-1, Wadazaki-cho, Hyogo-ku, Kobe-city, Hyogo Pref. Mitsubishi Electric Corporation Control Factory (56) References JP-A-64-85528 (JP, A) Japanese Patent Publication No. 7-1980 (JP, B2) Japanese Patent Publication No. 7-1981 (JP, B2) JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01R 31/08

Claims (1)

(57) [Claims] A plurality of switch substations are arranged at predetermined intervals on a three-phase distribution line, and information from each of the switch substations is collected by a central unit via communication means, thereby providing a distribution line. In order to detect the disconnection of the switch,
A function is provided to connect between the phase and the second phase to supply power and to detect at least a disconnection from abnormalities in voltage and current. Detected based on the information indicating the disconnection, the first and second
The phase disconnection and its section are information on which switch slave station has not responded to the communication from the central unit, and all of the switch slave units thereafter communicate from the central unit. A method for detecting a disconnection in a power distribution system, comprising the step of detecting from the information that there is no response to a power supply.