JP2009065830A - Digital protective relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital protective relay capable of certainly performing a switching operation between a remote operation means and a portable operation means. <P>SOLUTION: In a normal maintenance for a remote operation, a remote operation means 5 is connected to an interface 3B for the remote operation means through a LAN cable 7 and a line concentrator 4, and the remote operation means 5 is connected to a communication unit 2 through an inner connecting line 8 and a connection switching means 11 in the main body 1 of the digital protective relay. Accordingly, the main body 1 of the digital protective relay is established and regulated by means of the remote operation means 5. When a portable operation means 6 is connected to the interface 3A for the portable operation means through the LAN cable 7, a channel connected to the communication unit 2 through the inner connecting line 8 and the connection switching means 11 in the main body 1 of the digital protective relay is switched to the portable operation means 6, so that the main body 1 of the digital protective relay is established and regulated by means of the portable operation means 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital protective relay that can be operated by both a remote operation means having a remote operation maintenance function and a portable operation means such as a personal computer, and in particular, switching between the remote operation means and the portable operation means. The present invention relates to a digital protective relay that can be reliably operated.

  In general, digital operation relays of remote operation and maintenance type have an interface that can be connected to a LAN. By installing a LAN inside an electric station, remote operation and maintenance can be performed from inside and outside the electric station where the protective relay is installed. The function is realized. In addition, in this type of remote operation maintenance type digital protection relay, a human interface is provided for each digital protection relay separately from the remote operation maintenance function as described above. By connecting a portable operation means, it is possible to perform system electricity display, various settings, settling operations, inspection of abnormality information, and the like. In this case, a personal computer or a portable dedicated terminal is used as the portable operation means, and the personal computer or the like is directly connected to the protective relay in an electric station to browse information on the protective relay.

As described above, in the remote operation maintenance type digital protective relay, both the remote operation means and the portable operation means are connected. In order to prevent erroneous operation, it is indicated which means are connected. Or a configuration that only allows operation from one means. The invention shown in Patent Document 1 has been proposed in response to such a request, and any one of the operation means can be obtained by inserting / removing a relay cable into / from a LAN connection port provided in the digital protective relay. Are connected to the digital protective relay only.
JP 2001-309545 A

  However, in the conventional remote operation maintenance type digital protection relay as described above, there are problems such as cable disconnection or connector breakage due to repeated insertion and removal of relay cables and aging. there were. In addition, the structure of the relay cable and its connection port portion is complicated, it has a bad appearance, and the cost is high.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to switch between the portable operation means and the remote operation means without inserting or removing the relay cable. A digital protective relay that realizes functions such as system electricity quantity display, various settings, settling operations, abnormal information viewing, etc., and remote operation maintenance functions from inside and outside the electric station by remote operation means. It is to provide.

  In order to achieve the above-mentioned object, the present invention has a communication unit in a main body, and a general-purpose LAN for setting and setting for determining an accident of the power system etc. by inputting an electric quantity of the power system etc. In the digital protective relay remotely operated by the connected remote control means, in the digital protective relay main body, information is exchanged between the main body and the portable operating means or the remote operating means connected thereto. The communication unit is connected to the portable operation means interface and the remote operation means interface provided in the main body via the connection switching means. Remote operation means is connected to the interface for operation means, and this remote operation means is connected to the communication unit via the connection switching means. When a portable operation means is connected to the interface, the path connected to the communication unit via the connection switching means is switched to the portable operation means side by the connection switching means, and digital protection is provided by the portable operation means. The relay main body can be set and set, the digital protective relay main body is provided with a display device for switching the connection switching means, and the connection switching means detects the connection of the portable operation means and switches the connection. It is characterized by using an electronic relay that operates.

  In the present invention, when the portable operating means is connected to the digital protective relay main body, the connection switching means manually or automatically switches from the remote operating means to the portable operating means. This eliminates the need for operations such as insertion / extraction, and prevents inconveniences such as erroneous operations caused by mixing commands from the portable operation means and the remote operation means.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a digital protection relay according to the present invention will be described with reference to the drawings.

(1) First Embodiment A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a first embodiment constituting a digital protection relay with connection switching means.

  In FIG. 1, reference numeral 1 denotes a digital protective relay main body. The digital protective relay main body 1 inputs an electric quantity of a power system or the like in the same manner as a known digital protective relay, and this electric quantity The system determines the accident of the power system, etc., outputs a shut-off command based on the determined result, and various protection control units for inputting external device information, and interfaces such as switches, aggregate display LEDs, and test terminals A protective relay panel.

  The digital protective relay main body 1 is provided with a communication unit 2 for exchanging information between the main body 1 and portable operation means or remote operation means connected thereto. The portable operation means interface 3 </ b> A and the remote operation means interface 3 </ b> B provided in the main body 1 are connected via the internal connection line 8 and the connection switching means 11.

  Various types of connection switching means 11 can be used. In this embodiment, when the user connects the portable operation means 6 to the interface 3A, a mechanical switch is manually turned on / off. Use a switch. That is, when the portable operation means 6 is connected to the portable operation means interface 3A by the operation of the mechanical switch, the portable operation means interface 3A is connected to the communication unit 2 and the remote operation means interface is used. The interface 3B is disconnected.

  In the present embodiment having such a configuration, during normal remote operation maintenance, the remote operation means 5 is connected to the remote operation means interface 3B via the LAN cable 7 and the line concentrator 4. Is connected to the communication unit 2 through the internal connection line 8 in the digital protective relay main body 1 and the connection switching means 11, so that the digital protective relay main body 1 is set and set by the remote control means 5. Yes.

  On the other hand, when the portable operation means 6 is connected to the portable operation means interface 3A via the LAN cable 7, the communication unit 2 is connected via the internal connection line 8 and the connection switching means 11 in the digital protective relay main body 1. The path connected to is switched to the portable operation means 6 side, and the setting and setting of the digital protective relay main body 1 can be performed by the portable operation means 6.

  As described above, in the digital protection relay according to the first embodiment of the present invention, the connection switching unit 11 switches the connection between the remote operation unit 5 and the communication unit 2 and the connection between the portable operation unit 6 and the communication unit 2. Thus, when connecting the portable operation means 6, it is possible to omit work such as removing the LAN cable 7 connected to the remote operation means 5.

  Further, according to this embodiment, communication between the remote control means 5 and the communication unit 2 in the digital protection relay 1 and communication between the portable operation means 6 and the communication unit 2 in the digital protection relay 1 are performed. When the connection is switched exclusively, for example, the remote switching means 5 and the communication unit 2 are normally connected and the connection switching means 11 is connected only when the portable operation means 6 is connected. By switching the connection, it is possible to prevent color mixing and erroneous operation of communication data.

(2) Second Embodiment A second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the second embodiment, the connection switching means 11 for connecting the communication unit 2 to the portable operation means interface 3A and the remote operation means interface 3B is provided with a switching status display device 12 for displaying the switching status. This switching state display device 12 is configured so that it can be confirmed from the outside of the digital protective relay main body 1. As the connection state display means 12, an LED, a lamp, a liquid crystal display, or the like can be used.

  In the digital protection relay according to the second embodiment of the present invention configured as described above, the connection switching means 11 connects the remote operation means 5 and the communication unit 2 and the portable operation means 6 and the communication unit 2. Can be switched, the operation of removing the LAN cable 7 can be omitted, the erroneous operation due to the exclusive connection can be eliminated, and the connection status can be easily displayed by the switching status display device 12. Can be recognized.

(3) Third Embodiment A third embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, a transmission system automatic recognition device 13 is provided between the connection switching unit 11 and the portable operation unit interface 3A, and between the connection switching unit 11 and the remote operation unit interface 3B. By automatically determining the connection status of the remote operation means 5 and the portable operation means 6 by the automatic recognition device 13, the remote operation means 5 or the portable operation means 6 can set and set the digital protective relay main body 1 according to the transmission method. Implemented without restrictions. Here, as the transmission method automatic recognition device 13, a device that automatically recognizes a transmission speed, a protocol, and the like, for example, a device capable of automatically recognizing various transmission methods such as RS232C and USB is used.

  In particular, in this embodiment, the transmission method automatic recognition device 13 is mounted on both the remote operation means 5 side and the portable operation means 6 side, so that the user can set the transmission speed, full duplex / half duplex, communication protocol. The digital protective relay can be operated without being aware of the various settings.

(4) Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, the manual LAN switching device 14 is used as the connection switching means in the present invention, and the communication unit 2 and the portable operation means interface 3A or the remote operation are connected via the manual LAN switching device 14 and the internal LAN connection line 9. The means interface 3B is connected. In this case, as the manual LAN switching device 14 of this embodiment, the user switches the LAN by using a manual switch, or switches the LAN by an operation from the remote operation means 5 or the portable operation means 6. .

  In the digital protection relay of the fourth embodiment of the present invention having the above-described configuration, the remote operation means 5 and the communication unit 2 are detected by the manual LAN switching device 14 by detecting the voltage level of the internal LAN connection line 9 and the like. And the connection between the portable operation means 6 and the communication unit 2 can be switched.

(5) Fifth Embodiment A fifth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, as the LAN switching device in the fourth embodiment, the link is detected to automatically detect that the portable operation means 6 is connected, and the connection to the remote operation means 5 is disconnected. An automatic LAN switching device 15 is used. For example, taking Ethernet (registered trademark) as an example, when a cable is connected, a “LINK pulse” is detected to determine the connection status. In other words, the Ethernet transmission signal is differential transmission, and the “LINK pulse” is a signal that periodically repeats “H / L”, so the voltage level fluctuates by repeating “H / L”. Can be detected.

  In the fifth embodiment having such a configuration, when the portable operating means 6 is connected to the portable operating means interface 3A via the LAN cable 7, the automatic LAN switching device 15 connects the portable operating means 6 to the portable operating means 6A. By confirming that the link has been established, it is determined that the portable operation means 6 is connected, and the internal LAN connection line 9, the automatic LAN switching device 15 and the internal connection line 8 in the digital protective relay main body 1 are connected. The path connected to the communication unit 2 is switched to the portable operation means 6 side, and the digital protective relay main body 1 can be set and set by the portable operation means 6. In particular, in the present embodiment, since the connection is automatically switched, the user is not burdened and there is no fear of erroneous operation.

(6) Sixth Embodiment A sixth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, an electronic switch 16 is used as connection switching means, and the portable operation means interface 3A and the remote operation means interface 3B are connected to the communication unit 2 via the electronic switch 16. In this case, the electronic switch 16 determines that the portable operation means 6 is connected by the electronic switch 16 based on the voltage level of the internal connection line 8 or the like when the portable operation means 6 is connected via the LAN cable 7. The path connected to the communication unit 2 via the internal connection line 8 and the electronic switch 16 in the digital protective relay main body 1 is switched to the portable operation means 6 side.

  In the digital protection relay according to the sixth embodiment of the present invention configured as described above, the connection between the remote operation means 5 and the communication unit 2 and the connection between the portable operation means 6 and the communication unit 2 are made by the electronic switch 16. It is possible to switch, and it is possible to omit work such as removing the LAN cable 7 connected to the remote operation means 5 when the portable operation means 6 is connected. Moreover, compared with switching by manual operation as in the first embodiment, switching by electronic switch allows for reliable switching without the risk of the user forgetting the switching operation.

  In the present embodiment, by designing a circuit that avoids external influences (threshold level, dual determination, etc.), an error that is not the original voltage level change occurs due to some external influence. It is desirable to adopt a configuration that avoids switching. In the above-described embodiment, the “voltage level” is used, but the present invention includes switching by detection other than the voltage level.

(7) Seventh Embodiment A seventh embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, an electronic relay 17 is used as the connection switching means. The electronic relay 17 determines that the portable operation means 6 is connected by the electronic relay 17 based on the voltage level of the internal connection line 8 and the like, and connects the internal connection line 8 and the electronic relay 17 in the digital protective relay main body 1 to each other. The path connected to the communication unit 2 via the switch is switched to the portable operating means 6 side.

  In the digital protection relay according to the seventh embodiment of the present invention configured as described above, the electronic relay 17 connects the remote operation means 5 and the communication unit 2 and the portable operation means 6 and the communication unit 2. It is possible to switch. The electronic relay 17 switches the switching circuit “electromagnetically”, but the electronic switch 16 does not necessarily switch electromagnetically, and includes a switch having no mechanical contact such as a semiconductor switch. To do. In the present embodiment using the electronic relay 17, a simple configuration is required as compared with other electronic means, and there is an advantage that the device can be manufactured at low cost.

(8) Eighth Embodiment An eighth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, a communication control unit such as the switching hub 18 is used as the connection switching unit. This switching hub 18 confirms the state that a link with the portable operation means 6 is newly established when the portable operation means 6 is connected to the portable operation means interface 3A via the LAN cable 7. By doing so, it is determined that the portable operation means 6 is connected.

  In the digital protection relay according to the eighth embodiment of the present invention configured as described above, the switching hub 18 connects the remote operation means 5 and the communication unit 2 and the portable operation means 6 and the communication unit 2. It is possible to establish logically independently, and it is possible to omit work such as removing the LAN cable 7 connected to the remote operation means 5 when the portable operation means 6 is connected.

  The communication between the remote control means 5 and the communication unit 2 in the digital protection relay 1 and the communication between the portable operation means 6 and the communication unit 2 in the digital protection relay 1 are switched exclusively. When connecting, for example, by using the switching hub 18 to logically arrange the transmission direction of communication data, it is possible to prevent color mixing and erroneous operation of communication data.

  In particular, the switching hub 18 in the present embodiment establishes each connection path even when a means for directly operating the interface is connected to the interface, without physically disconnecting the remote operation side LAN. However, color mixing of communication data can be avoided by identifying the MAC address. As a result, it is possible to operate from the remote operation means without releasing the connection of the portable operation means, and remote operation and maintenance are possible even when the user forgets to release the connection of the portable operation means.

1 is a block diagram showing a digital protective relay with connection switching means according to a first embodiment of the present invention. The block diagram which shows the switching type display which is 2nd Embodiment of this invention, and the digital type protective relay with a connection switching means. The block diagram which shows the digital-type protection relay with a transmission-system automatic recognition apparatus and connection switching means which is 3rd Embodiment of this invention. The block diagram which shows the digital type protective relay with a manual LAN switching apparatus which is 4th Embodiment of this invention. The block diagram which shows the digital type protective relay with an automatic LAN switching apparatus which is 5th Embodiment of this invention. The block diagram which shows the digital type protective relay with an electronic switch which is 6th Embodiment of this invention. The block diagram which shows the digital protection relay with an electronic relay which is 7th Embodiment of this invention. The block diagram which shows the digital type protective relay with a switching hub which is 8th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Digital type protective relay 2 ... Communication unit 3A ... Interface (for portable operation means)
3B ... Interface (for remote control means)
4 ... Concentrator 5 ... Remote operation means 6 ... Portable operation means 7 ... LAN cable 8 ... Internal connection line 9 ... Internal LAN connection line 11 ... Connection switching means 12 ... Switching status display device 13 ... Transmission method automatic recognition device 14 ... LAN switching device 15 ... automatic LAN switching device 16 ... electronic switch 17 ... electronic relay 18 ... switching hub

Claims (1)

A digital type equipped with a communication unit in the main body and remotely operated by a remote control means connected to a general-purpose LAN for inputting an electric quantity of the power system etc. and determining an accident of the power system etc. In protective relay,
In the digital protective relay main body, a communication unit is provided for exchanging information between the main body and portable operation means or remote operation means connected thereto,
This communication unit is connected to the interface for portable operation means and the interface for remote operation means provided in the main body via the connection switching means,
At the time of remote operation maintenance, remote operation means is connected to the interface for remote operation means, this remote operation means is connected to the communication unit via the connection switching means,
When the portable operation means is connected to the interface for the portable operation means, the path connected to the communication unit via the connection switching means is switched to the portable operation means side by the connection switching means, and the portable operation means Can set and set the digital protective relay main body,
The digital protective relay main body is provided with a display device for switching state of the connection switching means,
An electronic relay that detects the connection of portable operation means and performs a switching operation is used as the connection switching means.

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