JPH11273524A - Switch control device for power distribution automation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch control system preventing closing faults of a switch for a high-voltage cable almost completely. SOLUTION: When an operation sensor 9 detects that a switching excitation circuit 6 does not operate even though a closing instruction is given from a CPU 7 to a closing relay 5 provided to the switching excitation circuit 6 of the switching gear 2 for a high-voltage cable, the CPU 7 repeatedly gives closing instructions and opening instructions to the closing relay 5 at short time intervals. Consequently, a closing relay contact is oscillated, thus the contact faults are resolved in most cases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a high-voltage line switch arranged on a high-voltage distribution line.

[0002]

2. Description of the Related Art A high-voltage line switch of a high-voltage distribution line in which an automatic power distribution system is used has slave stations for communication, and a remote master station communicates with these slave stations via a communication line such as an optical fiber. Signal can be sent through the switch to automatically open and close the high-voltage line switch. Each slave station has a built-in CPU, and issues an open / close command to the closing relay provided in the open / close excitation circuit in response to a signal from the master station, and energizes and demagnetizes the open / close coil to open / close the high-voltage line. The container is performing the closing operation and the opening operation.

However, even if the CPU of the slave station issues a closing command, it rarely fails to turn on the high-voltage line switch. When investigating the cause, it was found that there might be minor relay contact failures such as minute dust adhering to the input relay contacts. In a relay having a mechanical contact, it is not easy to completely prevent such a contact failure.

[0004] In order to solve this problem, relay manufacturers have devised to use twin contacts or scratch contacts as relay contacts, but they still cannot completely prevent defective contacts. This problem can be almost completely solved by designing a circuit in which the relays are arranged in a double manner, but there is a drawback that causes a cost increase.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and makes it possible to almost completely prevent a switching failure of a high-voltage line switch while minimizing an increase in cost. It is intended to provide a container control device.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a switch control device according to the present invention comprises a switching relay provided in a switching excitation circuit of a high-voltage line switch, and a CPU of a slave station. When a switching failure is detected in a switch control device having a structure for automatically opening and closing a high-voltage line switch by sending a switching command from the slave station, the CPU of the slave station issues a closing command to the closing relay at a short time interval. An open command is repeatedly issued.

In the switch control device of the present invention, the CP of the slave station is
If the high-voltage line switch cannot be closed even though U has issued the closing command to the closing relay, the CPU of the slave station repeatedly issues the closing command and the opening command at short time intervals. As a result, since the closing relay contact vibrates, fine dust adhering on the contact is almost naturally removed in most cases, and the defective contact is eliminated. Therefore, the high-voltage line switch is correctly turned on.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a high-voltage distribution line of, for example, 6.6 kV;
A high-voltage line switch 3 installed on the top to open and close the line is a communication slave station installed for each high-voltage line switch 2. The slave station 3 is connected to a remote master station by a communication line such as an optical fiber.

Reference numeral 4 denotes an open / close coil for opening / closing the high-voltage line switch 2. Reference numeral 10 denotes a rectifier circuit for rectifying AC power and supplying the rectified AC power to the open / close coil 4. The switching excitation circuit 6 is connected in series. The slave station 3 has a CPU 7, and a signal from the master station is input to the CPU 7 via the modem 8, and the CPU 7 issues a closing command or an opening command to the closing relay 5 to excite the opening / closing coil 4. The degaussing causes the high-voltage line switch 2 to perform a closing operation and an opening operation.

In the present invention, the opening / closing excitation circuit 6 is provided with an operation sensor 9 for the excitation circuit. In the embodiment shown in FIG. 1, the operation sensor 9 of the excitation circuit is CT, and the operation of the excitation circuit is detected by detecting the current of the switching excitation circuit 6. However, even if a method of detecting the operation of the excitation circuit based on the voltage of the switching excitation circuit 6 as in the other embodiment shown in FIG. 2 is employed, the high-voltage line switch as in the other embodiment shown in FIG. A method of detecting the open / closed state of the second contact may be adopted.

When the CPU 7 issues a closing command to the closing relay 5, the operation sensor 9 detects the open / close excitation circuit 6.
Detects whether or not has operated correctly. If the opening / closing excitation circuit 6 does not operate even though the CPU 7 issues a closing command to the closing relay 5, it is determined that the closing has failed. As shown in FIG. Are repeatedly issued to the closing relay 5.
As described above, among the relay contact failures of the closing relay 5, those that are caused by minor causes such as adhesion of dust to the contacts include:
By repeating the closing command and the opening command at short time intervals and moving the relay contacts, the contact failure is eliminated, the switching excitation circuit 6 operates, and the switching coil 4 is excited. As a result, the high-voltage line switch 2 is correctly turned on, and power transmission can be stabilized.

However, if the opening / closing excitation circuit 6 does not operate even after repeating the closing command and the opening command several times, there is a possibility that there is another serious cause. Station 3 informs the master station of that fact. In this case, the worker goes to the site to perform inspection and repair.

[0013]

As described above, according to the switch control device of the present invention, when the closing failure is detected by the operation sensor of the excitation circuit, the CPU sends the closing command to the closing relay at short time intervals. Since the opening command is repeatedly issued, the relay contact failure due to minor causes such as adhesion of dust is almost eliminated, and the high-voltage line switch can be correctly turned on. Moreover, the present invention has the advantage that the motion sensor can be incorporated into the existing device and the program of the CPU only needs to be reworked, so that much additional cost is not required. In many cases, a device that can be used as an operation sensor of an excitation circuit is already incorporated in a slave station or a switch for a high-voltage line, and in that case, the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a switch control device according to the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the switch control device of the present invention.

FIG. 3 is a circuit diagram showing another embodiment of the switch control device of the present invention.

FIG. 4 is a waveform diagram of a signal output by a CPU when a failure in insertion is detected.

[Explanation of symbols]

1 high voltage distribution line, 2 high voltage line switch, 3 communication slave station, 4 switching coil, 5 switching relay, 6 switching excitation circuit, 7 CPU, 8 modem, 9 excitation circuit operation sensor, 10 rectification circuit

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[Procedure amendment]

[Submission date] April 22, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title : Switch control device for distribution automation system

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a power distribution automation system.
The present invention relates to a control device for a high-voltage line switch that employs a system.

[0002]

2. Description of the Related Art A high-voltage line switch of a high-voltage distribution line in which an automatic power distribution system is used has slave stations for communication, and a remote master station communicates with these slave stations via a communication line such as an optical fiber. Signal can be sent through the switch to automatically open and close the high-voltage line switch. Each slave station has a built-in CPU, and issues an open / close command to the closing relay provided in the open / close excitation circuit in response to a signal from the master station, and energizes and demagnetizes the open / close coil to open / close the high-voltage line. The container is performing the closing operation and the opening operation.

However, even if the CPU of the slave station issues a closing command, it rarely fails to turn on the high-voltage line switch. When investigating the cause, it was found that there might be minor relay contact failures such as minute dust adhering to the input relay contacts. In a relay having a mechanical contact, it is not easy to completely prevent such a contact failure.

[0004] In order to solve this problem, relay manufacturers have devised to use twin contacts or scratch contacts as relay contacts, but they still cannot completely prevent defective contacts. This problem can be almost completely solved by designing a circuit in which the relays are arranged in a double manner, but there is a drawback that causes a cost increase.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention is to solve the conventional problems mentioned above, while minimizing the cost, it is possible to almost completely prevent the charged defects for high pressure line switch Distribution It is intended to provide a switch control device for an automation system .

[0006]

A switch control device for a distribution automation system according to the present invention, which has been made to solve the above-mentioned problems, comprises a switching relay provided in a switching excitation circuit of a high-voltage line switch. , A power distribution automation system with a structure to send a switching command from the slave station's CPU to automatically open and close the high-voltage line switch.
In switch control device for Temu, when turned failure is detected, emits CPU of slave station repeats a closing command the opening command at short time intervals with respect to the input relay, the number
Even if the closing command and opening command are repeated
If the closed excitation circuit does not operate, this operation is stopped and C
It is characterized in that the injection command is continued from the PU .

In the switch control apparatus for an automatic power distribution system according to the present invention, if the switch for the high-voltage line cannot be turned on even though the CPU of the slave station issues a turn-on command to the turn-on relay, The CPU of the slave station repeatedly issues the closing command and the opening command at short time intervals. As a result, since the closing relay contact vibrates, fine dust adhering on the contact is almost naturally removed in most cases, and the defective contact is eliminated. Therefore, the high-voltage line switch is correctly turned on, and the distribution automation system functions properly .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is
For example, 6.6 kV where the distribution automation system is adopted
Reference numeral 2 denotes a high-voltage line switch installed on the high-voltage distribution line 1 and opens and closes a line. Reference numeral 3 denotes a communication slave station provided for each high-voltage line switch 2. This child station 3
Is connected to a remote master station by a communication line such as an optical fiber.

Reference numeral 4 denotes an open / close coil for opening / closing the high-voltage line switch 2. Reference numeral 10 denotes a rectifier circuit for rectifying AC power and supplying the rectified AC power to the open / close coil 4. The switching excitation circuit 6 is connected in series. The slave station 3 has a CPU 7, and a signal from the master station is input to the CPU 7 via the modem 8, and the CPU 7 issues a closing command or an opening command to the closing relay 5 to excite the opening / closing coil 4. The degaussing causes the high-voltage line switch 2 to perform a closing operation and an opening operation.

In the present invention, the opening / closing excitation circuit 6 is provided with an operation sensor 9 for the excitation circuit. In the embodiment shown in FIG. 1, the operation sensor 9 of the excitation circuit is CT, and the operation of the excitation circuit is detected by detecting the current of the switching excitation circuit 6. However, even if a method of detecting the operation of the excitation circuit based on the voltage of the switching excitation circuit 6 as in the other embodiment shown in FIG. 2 is employed, the high-voltage line switch as in the other embodiment shown in FIG. A method of detecting the open / closed state of the second contact may be adopted.

When the CPU 7 issues a closing command to the closing relay 5, the operation sensor 9 detects the open / close excitation circuit 6.
Detects whether or not has operated correctly. If the opening / closing excitation circuit 6 does not operate even though the CPU 7 issues a closing command to the closing relay 5, it is determined that the closing has failed. As shown in FIG. Are repeatedly issued to the closing relay 5.
As described above, among the relay contact failures of the closing relay 5, those that are caused by minor causes such as adhesion of dust to the contacts include:
By repeating the closing command and the opening command at short time intervals and moving the relay contacts, the contact failure is eliminated, the switching excitation circuit 6 operates, and the switching coil 4 is excited. As a result, the high-voltage line switch 2 is correctly turned on, and power transmission can be stabilized.

[0012] However, if even repeating the opening command and closing command several times Incidentally off the exciting circuit 6 does not operate, there is a possibility that there are other significant cause, this operation is aborted child Station 3 informs the master station of that fact. In this case, the worker goes to the site to perform inspection and repair. In this case, as shown in FIG.
Continue the ON command.

[0013]

As described above, the power distribution automation system of the present invention is described.
In the switch control device for the stem, when the failure of the closing is detected by the operation sensor of the excitation circuit, the CPU repeatedly issues the closing command and the opening command to the closing relay at a short time interval. Therefore, the relay contact failure due to minor causes such as adhesion of dust is almost eliminated, and the switch for the high voltage line can be correctly turned on. Moreover, the present invention has the advantage that the motion sensor can be incorporated into the existing device and the program of the CPU only needs to be reworked, so that much additional cost is not required. In many cases, a device that can be used as an operation sensor of an excitation circuit is already incorporated in a slave station or a switch for a high-voltage line, and in that case, the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a switch control device according to the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the switch control device of the present invention.

FIG. 3 is a circuit diagram showing another embodiment of the switch control device of the present invention.

FIG. 4 is a waveform diagram of a signal output by a CPU when a failure in insertion is detected.

[Description of Signs] 1 High-voltage distribution line, 2 High-voltage line switch, 3 Communication slave station, 4 Switching coil, 5 Closing relay, 6 Switching excitation circuit, 7 CPU, 8 Modem, 9 Operation of excitation circuit Sensor, 10 rectifier circuit

Claims (1)

[Claims] 1. A switch control device having a structure in which a switching command is sent from a CPU of a slave station to a closing relay provided in a switching excitation circuit of a high-voltage line switch to automatically open and close the high-voltage line switch. A switch control device characterized in that when a failure is detected, the CPU of the slave station repeatedly issues a closing command and an opening command to the closing relay at short time intervals.